Project import generated by Copybara.

GitOrigin-RevId: 6e5aa035cd1f6a9333962df5d3ab97a05bd5744e

.bazelrc

@@ -32,6 +32,9 @@ build:macos --copt=-w
 # Sets the default Apple platform to macOS.
 build --apple_platform_type=macos
 
+# Compile ObjC++ files with C++17
+build --per_file_copt=.*\.mm\$@-std=c++17
+
 # Allow debugging with XCODE
 build --apple_generate_dsym
 
@@ -88,6 +91,10 @@ build:darwin_x86_64 --apple_platform_type=macos
 build:darwin_x86_64 --macos_minimum_os=10.12
 build:darwin_x86_64 --cpu=darwin_x86_64
 
+build:darwin_arm64 --apple_platform_type=macos
+build:darwin_arm64 --macos_minimum_os=10.16
+build:darwin_arm64 --cpu=darwin_arm64
+
 # This bazelrc file is meant to be written by a setup script.
 try-import %workspace%/.configure.bazelrc
 

.bazelversion

@@ -1 +1 @@
-4.2.1
+5.2.0

.github/ISSUE_TEMPLATE/50-other-issues.md

@@ -10,5 +10,3 @@ For questions on how to work with MediaPipe, or support for problems that are no
 
 If you are reporting a vulnerability, please use the [dedicated reporting process](https://github.com/google/mediapipe/security).
 
-For high-level discussions about MediaPipe, please post to discuss@mediapipe.org, for questions about the development or internal workings of MediaPipe, or if you would like to know how to contribute to MediaPipe, please post to developers@mediapipe.org.
-

.github/bot_config.yml

@@ -15,4 +15,4 @@
 
 # A list of assignees
 assignees:
-   - sgowroji
+   - sureshdagooglecom

Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 
 MAINTAINER <[email protected]>
 
@@ -42,6 +42,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         software-properties-common && \
     add-apt-repository -y ppa:openjdk-r/ppa && \
     apt-get update && apt-get install -y openjdk-8-jdk && \
+    apt-get install -y mesa-common-dev libegl1-mesa-dev libgles2-mesa-dev && \
+    apt-get install -y mesa-utils && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
@@ -50,13 +52,13 @@ RUN pip3 install --upgrade setuptools
 RUN pip3 install wheel
 RUN pip3 install future
 RUN pip3 install six==1.14.0
-RUN pip3 install tensorflow==1.14.0
+RUN pip3 install tensorflow==2.2.0
 RUN pip3 install tf_slim
 
 RUN ln -s /usr/bin/python3 /usr/bin/python
 
 # Install bazel
-ARG BAZEL_VERSION=4.2.1
+ARG BAZEL_VERSION=5.2.0
 RUN mkdir /bazel && \
     wget --no-check-certificate -O /bazel/installer.sh "https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/b\
 azel-${BAZEL_VERSION}-installer-linux-x86_64.sh" && \

README.md

@@ -136,8 +136,8 @@ run code search using
 
 ## Community
 
-*   [Awesome MediaPipe](https://mediapipe.org) - A curated list of awesome
-    MediaPipe related frameworks, libraries and software
+*   [Awesome MediaPipe](https://mediapipe.page.link/awesome-mediapipe) - A
+    curated list of awesome MediaPipe related frameworks, libraries and software
 *   [Slack community](https://mediapipe.page.link/joinslack) for MediaPipe users
 *   [Discuss](https://groups.google.com/forum/#!forum/mediapipe) - General
     community discussion around MediaPipe

WORKSPACE

@@ -35,8 +35,9 @@ http_archive(
 
 http_archive(
     name = "rules_cc",
-    strip_prefix = "rules_cc-main",
-    urls = ["https://github.com/bazelbuild/rules_cc/archive/main.zip"],
+    strip_prefix = "rules_cc-2f8c04c04462ab83c545ab14c0da68c3b4c96191",
+# The commit can be updated if the build passes. Last updated 6/23/22.
+    urls = ["https://github.com/bazelbuild/rules_cc/archive/2f8c04c04462ab83c545ab14c0da68c3b4c96191.zip"],
 )
 
 http_archive(
@@ -61,11 +62,12 @@ http_archive(
     sha256 = "de682ea824bfffba05b4e33b67431c247397d6175962534305136aa06f92e049",
 )
 
-# Google Benchmark library.
+# Google Benchmark library v1.6.1 released on 2022-01-10.
 http_archive(
     name = "com_google_benchmark",
-    urls = ["https://github.com/google/benchmark/archive/main.zip"],
-    strip_prefix = "benchmark-main",
+    urls = ["https://github.com/google/benchmark/archive/refs/tags/v1.6.1.tar.gz"],
+    strip_prefix = "benchmark-1.6.1",
+    sha256 = "6132883bc8c9b0df5375b16ab520fac1a85dc9e4cf5be59480448ece74b278d4",
     build_file = "@//third_party:benchmark.BUILD",
 )
 
@@ -201,7 +203,10 @@ new_local_repository(
 new_local_repository(
     name = "macos_opencv",
     build_file = "@//third_party:opencv_macos.BUILD",
-    path = "/usr/local/opt/opencv@3",
+    # For local MacOS builds, the path should point to an opencv@3 installation.
+    # If you edit the path here, you will also need to update the corresponding
+    # prefix in "opencv_macos.BUILD".
+    path = "/usr/local",
 )
 
 new_local_repository(
@@ -373,9 +378,9 @@ http_archive(
 )
 
 # Tensorflow repo should always go after the other external dependencies.
-# 2021-12-02
-_TENSORFLOW_GIT_COMMIT = "18a1dc0ba806dc023808531f0373d9ec068e64bf"
-_TENSORFLOW_SHA256 = "85b90416f7a11339327777bccd634de00ca0de2cf334f5f0727edcb11ff9289a"
+# 2022-02-15
+_TENSORFLOW_GIT_COMMIT = "a3419acc751dfc19caf4d34a1594e1f76810ec58"
+_TENSORFLOW_SHA256 = "b95b2a83632d4055742ae1a2dcc96b45da6c12a339462dbc76c8bca505308e3a"
 http_archive(
     name = "org_tensorflow",
     urls = [
@@ -383,7 +388,6 @@ http_archive(
     ],
     patches = [
         "@//third_party:org_tensorflow_compatibility_fixes.diff",
-        "@//third_party:org_tensorflow_objc_cxx17.diff",
         # Diff is generated with a script, don't update it manually.
         "@//third_party:org_tensorflow_custom_ops.diff",
     ],

build_android_examples.sh

@@ -109,7 +109,7 @@ for app in ${apps}; do
           if [[ ${category} != "shoe" ]]; then
             bazel_flags_extended+=(--define ${category}=true)
           fi
-          bazel "${bazel_flags_extended[@]}"
+          bazelisk "${bazel_flags_extended[@]}"
           cp -f "${bin}" "${apk}"
         fi
         apks+=(${apk})
@@ -120,7 +120,7 @@ for app in ${apps}; do
         if [[ ${app_name} == "templatematchingcpu" ]]; then
           switch_to_opencv_4
         fi
-        bazel "${bazel_flags[@]}"
+        bazelisk "${bazel_flags[@]}"
         cp -f "${bin}" "${apk}"
         if [[ ${app_name} == "templatematchingcpu" ]]; then
           switch_to_opencv_3

build_desktop_examples.sh

@@ -83,7 +83,7 @@ for app in ${apps}; do
       bazel_flags=("${default_bazel_flags[@]}")
       bazel_flags+=(${target})
 
-      bazel "${bazel_flags[@]}"
+      bazelisk "${bazel_flags[@]}"
       cp -f "${bin_dir}/${app}/"*"_cpu" "${out_dir}"
     fi
     if [[ $build_only == false ]]; then

build_ios_examples.sh

@@ -71,7 +71,7 @@ for app in ${apps}; do
       bazel_flags+=(--linkopt=-s)
     fi
 
-    bazel "${bazel_flags[@]}"
+    bazelisk "${bazel_flags[@]}"
     cp -f "${bin_dir}/${app}/"*".ipa" "${out_dir}"
   fi
 done

docs/framework_concepts/synchronization.md

@@ -169,7 +169,7 @@ behavior depending on resource constraints.
 
 [`CalculatorBase`]: https://github.com/google/mediapipe/tree/master/mediapipe/framework/calculator_base.h
 [`DefaultInputStreamHandler`]: https://github.com/google/mediapipe/tree/master/mediapipe/framework/stream_handler/default_input_stream_handler.h
-[`SyncSetInputStreamHandler`]: https://github.com/google/mediapipe/tree/master/mediapipe/framework/stream_handler/sync_set_input_stream_handler.h
-[`ImmediateInputStreamHandler`]: https://github.com/google/mediapipe/tree/master/mediapipe/framework/stream_handler/immediate_input_stream_handler.h
+[`SyncSetInputStreamHandler`]: https://github.com/google/mediapipe/tree/master/mediapipe/framework/stream_handler/sync_set_input_stream_handler.cc
+[`ImmediateInputStreamHandler`]: https://github.com/google/mediapipe/tree/master/mediapipe/framework/stream_handler/immediate_input_stream_handler.cc
 [`CalculatorGraphConfig::max_queue_size`]: https://github.com/google/mediapipe/tree/master/mediapipe/framework/calculator.proto
 [`FlowLimiterCalculator`]: https://github.com/google/mediapipe/tree/master/mediapipe/calculators/core/flow_limiter_calculator.cc

docs/getting_started/android.md

@@ -30,7 +30,7 @@ APIs (currently in alpha) that are now available in
 *   Install MediaPipe following these [instructions](./install.md).
 *   Setup Java Runtime.
 *   Setup Android SDK release 30.0.0 and above.
-*   Setup Android NDK version 18 and above.
+*   Setup Android NDK version between 18 and 21.
 
 MediaPipe recommends setting up Android SDK and NDK via Android Studio (and see
 below for Android Studio setup). However, if you prefer using MediaPipe without
@@ -53,7 +53,7 @@ the following:
 
 ```bash
 $ echo "android_sdk_repository(name = \"androidsdk\")" >> WORKSPACE
-$ echo "android_ndk_repository(name = \"androidndk\")" >> WORKSPACE
+$ echo "android_ndk_repository(name = \"androidndk\", api_level=21)" >> WORKSPACE
 ```
 
 In order to use MediaPipe on earlier Android versions, MediaPipe needs to switch

docs/getting_started/android_archive_library.md

@@ -48,6 +48,16 @@ each project.
     bazel build -c opt --strip=ALWAYS \
         --host_crosstool_top=@bazel_tools//tools/cpp:toolchain \
         --fat_apk_cpu=arm64-v8a,armeabi-v7a \
+        --legacy_whole_archive=0 \
+        --features=-legacy_whole_archive \
+        --copt=-fvisibility=hidden \
+        --copt=-ffunction-sections \
+        --copt=-fdata-sections \
+        --copt=-fstack-protector \
+        --copt=-Oz \
+        --copt=-fomit-frame-pointer \
+        --copt=-DABSL_MIN_LOG_LEVEL=2 \
+        --linkopt=-Wl,--gc-sections,--strip-all \
         //path/to/the/aar/build/file:aar_name.aar
     ```
 
@@ -57,6 +67,16 @@ each project.
     bazel build -c opt --strip=ALWAYS \
         --host_crosstool_top=@bazel_tools//tools/cpp:toolchain \
         --fat_apk_cpu=arm64-v8a,armeabi-v7a \
+        --legacy_whole_archive=0 \
+        --features=-legacy_whole_archive \
+        --copt=-fvisibility=hidden \
+        --copt=-ffunction-sections \
+        --copt=-fdata-sections \
+        --copt=-fstack-protector \
+        --copt=-Oz \
+        --copt=-fomit-frame-pointer \
+        --copt=-DABSL_MIN_LOG_LEVEL=2 \
+        --linkopt=-Wl,--gc-sections,--strip-all \
         //mediapipe/examples/android/src/java/com/google/mediapipe/apps/aar_example:mediapipe_face_detection.aar
 
     # It should print:

docs/getting_started/gpu_support.md

@@ -59,6 +59,21 @@ OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
 OpenGL ES profile extensions:
 ```
 
+If you have connected to your computer through SSH and find when you probe for
+GPU information you see the output:
+
+```bash
+glxinfo | grep -i opengl
+Error: unable to open display
+```
+
+Try re-establishing your SSH connection with the `-X` option and try again. For
+example:
+
+```bash
+ssh -X <user>@<host>
+```
+
 *Notice the ES 3.20 text above.*
 
 You need to see ES 3.1 or greater printed in order to perform TFLite inference

docs/getting_started/hello_world_ios.md

@@ -131,7 +131,7 @@ Create a `BUILD` file in the `$APPLICATION_PATH` and add the following build
 rules:
 
 ```
-MIN_IOS_VERSION = "10.0"
+MIN_IOS_VERSION = "11.0"
 
 load(
     "@build_bazel_rules_apple//apple:ios.bzl",

docs/getting_started/install.md

@@ -569,7 +569,7 @@ next section.
 
     Option 1. Follow
     [the official Bazel documentation](https://docs.bazel.build/versions/master/install-windows.html)
-    to install Bazel 4.2.1 or higher.
+    to install Bazel 5.0.0 or higher.
 
     Option 2. Follow the official
     [Bazel documentation](https://docs.bazel.build/versions/master/install-bazelisk.html)

docs/getting_started/ios.md

@@ -32,9 +32,14 @@ example apps, start from, start from
     xcode-select --install
     ```
 
-3.  Install [Bazel](https://bazel.build/).
+3.  Install [Bazelisk](https://github.com/bazelbuild/bazelisk)
+.
 
-    We recommend using [Homebrew](https://brew.sh/) to get the latest version.
+    We recommend using [Homebrew](https://brew.sh/) to get the latest versions.
+
+    ```bash
+    brew install bazelisk
+    ```
 
 4.  Set Python 3.7 as the default Python version and install the Python "six"
     library. This is needed for TensorFlow.
@@ -187,6 +192,9 @@ Note: When you ask Xcode to run an app, by default it will use the Debug
 configuration. Some of our demos are computationally heavy; you may want to use
 the Release configuration for better performance.
 
+Note: Due to an imcoptibility caused by one of our dependencies, MediaPipe
+cannot be used for apps running on the iPhone Simulator on Apple Silicon (M1).
+
 Tip: To switch build configuration in Xcode, click on the target menu, choose
 "Edit Scheme...", select the Run action, and switch the Build Configuration from
 Debug to Release. Note that this is set independently for each target.

docs/getting_started/python_framework.md

@@ -126,6 +126,7 @@ following steps:
             }
             return packet.Get<MyType>();
           });
+    }
     }  // namespace mediapipe
     ```
 

docs/index.md

@@ -136,8 +136,8 @@ run code search using
 
 ## Community
 
-*   [Awesome MediaPipe](https://mediapipe.org) - A curated list of awesome
-    MediaPipe related frameworks, libraries and software
+*   [Awesome MediaPipe](https://mediapipe.page.link/awesome-mediapipe) - A
+    curated list of awesome MediaPipe related frameworks, libraries and software
 *   [Slack community](https://mediapipe.page.link/joinslack) for MediaPipe users
 *   [Discuss](https://groups.google.com/forum/#!forum/mediapipe) - General
     community discussion around MediaPipe

docs/solutions/face_detection.md

@@ -26,7 +26,7 @@ MediaPipe Face Detection is an ultrafast face detection solution that comes with
 face detector tailored for mobile GPU inference. The detector's super-realtime
 performance enables it to be applied to any live viewfinder experience that
 requires an accurate facial region of interest as an input for other
-task-specific models, such as 3D facial keypoint or geometry estimation (e.g.,
+task-specific models, such as 3D facial keypoint estimation (e.g.,
 [MediaPipe Face Mesh](./face_mesh.md)), facial features or expression
 classification, and face region segmentation. BlazeFace uses a lightweight
 feature extraction network inspired by, but distinct from

docs/solutions/face_mesh.md

@@ -20,34 +20,34 @@ nav_order: 2
 
 ## Overview
 
-MediaPipe Face Mesh is a face geometry solution that estimates 468 3D face
-landmarks in real-time even on mobile devices. It employs machine learning (ML)
-to infer the 3D surface geometry, requiring only a single camera input without
-the need for a dedicated depth sensor. Utilizing lightweight model architectures
-together with GPU acceleration throughout the pipeline, the solution delivers
-real-time performance critical for live experiences.
+MediaPipe Face Mesh is a solution that estimates 468 3D face landmarks in
+real-time even on mobile devices. It employs machine learning (ML) to infer the
+3D facial surface, requiring only a single camera input without the need for a
+dedicated depth sensor. Utilizing lightweight model architectures together with
+GPU acceleration throughout the pipeline, the solution delivers real-time
+performance critical for live experiences.
 
-Additionally, the solution is bundled with the Face Geometry module that bridges
-the gap between the face landmark estimation and useful real-time augmented
-reality (AR) applications. It establishes a metric 3D space and uses the face
-landmark screen positions to estimate face geometry within that space. The face
-geometry data consists of common 3D geometry primitives, including a face pose
-transformation matrix and a triangular face mesh. Under the hood, a lightweight
-statistical analysis method called
+Additionally, the solution is bundled with the Face Transform module that
+bridges the gap between the face landmark estimation and useful real-time
+augmented reality (AR) applications. It establishes a metric 3D space and uses
+the face landmark screen positions to estimate a face transform within that
+space. The face transform data consists of common 3D primitives, including a
+face pose transformation matrix and a triangular face mesh. Under the hood, a
+lightweight statistical analysis method called
 [Procrustes Analysis](https://en.wikipedia.org/wiki/Procrustes_analysis) is
 employed to drive a robust, performant and portable logic. The analysis runs on
 CPU and has a minimal speed/memory footprint on top of the ML model inference.
 
 ![face_mesh_ar_effects.gif](../images/face_mesh_ar_effects.gif) |
 :-------------------------------------------------------------: |
-*Fig 1. AR effects utilizing facial surface geometry.*          |
+*Fig 1. AR effects utilizing the 3D facial surface.*            |
 
 ## ML Pipeline
 
 Our ML pipeline consists of two real-time deep neural network models that work
 together: A detector that operates on the full image and computes face locations
 and a 3D face landmark model that operates on those locations and predicts the
-approximate surface geometry via regression. Having the face accurately cropped
+approximate 3D surface via regression. Having the face accurately cropped
 drastically reduces the need for common data augmentations like affine
 transformations consisting of rotations, translation and scale changes. Instead
 it allows the network to dedicate most of its capacity towards coordinate
@@ -55,8 +55,8 @@ prediction accuracy. In addition, in our pipeline the crops can also be
 generated based on the face landmarks identified in the previous frame, and only
 when the landmark model could no longer identify face presence is the face
 detector invoked to relocalize the face. This strategy is similar to that
-employed in our [MediaPipe Hands](./hands.md) solution, which uses a palm detector
-together with a hand landmark model.
+employed in our [MediaPipe Hands](./hands.md) solution, which uses a palm
+detector together with a hand landmark model.
 
 The pipeline is implemented as a MediaPipe
 [graph](https://github.com/google/mediapipe/tree/master/mediapipe/graphs/face_mesh/face_mesh_mobile.pbtxt)
@@ -128,7 +128,7 @@ about the model in this [paper](https://arxiv.org/abs/2006.10962).
 :---------------------------------------------------------------------------: |
 *Fig 3. Attention Mesh: Overview of model architecture.*                      |
 
-## Face Geometry Module
+## Face Transform Module
 
 The [Face Landmark Model](#face-landmark-model) performs a single-camera face landmark
 detection in the screen coordinate space: the X- and Y- coordinates are
@@ -140,7 +140,7 @@ enable the full spectrum of augmented reality (AR) features like aligning a
 virtual 3D object with a detected face.
 
 The
-[Face Geometry module](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_geometry)
+[Face Transform module](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_geometry)
 moves away from the screen coordinate space towards a metric 3D space and
 provides necessary primitives to handle a detected face as a regular 3D object.
 By design, you'll be able to use a perspective camera to project the final 3D
@@ -151,7 +151,7 @@ landmark positions are not changed.
 
 #### Metric 3D Space
 
-The **Metric 3D space** established within the Face Geometry module is a
+The **Metric 3D space** established within the Face Transform module is a
 right-handed orthonormal metric 3D coordinate space. Within the space, there is
 a **virtual perspective camera** located at the space origin and pointed in the
 negative direction of the Z-axis. In the current pipeline, it is assumed that
@@ -184,11 +184,11 @@ functions:
 
 ### Components
 
-#### Geometry Pipeline
+#### Transform Pipeline
 
-The **Geometry Pipeline** is a key component, which is responsible for
-estimating face geometry objects within the Metric 3D space. On each frame, the
-following steps are executed in the given order:
+The **Transform Pipeline** is a key component, which is responsible for
+estimating the face transform objects within the Metric 3D space. On each frame,
+the following steps are executed in the given order:
 
 -   Face landmark screen coordinates are converted into the Metric 3D space
     coordinates;
@@ -199,12 +199,12 @@ following steps are executed in the given order:
     positions (XYZ), while both the vertex texture coordinates (UV) and the
     triangular topology are inherited from the canonical face model.
 
-The geometry pipeline is implemented as a MediaPipe
+The transform pipeline is implemented as a MediaPipe
 [calculator](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_geometry/geometry_pipeline_calculator.cc).
-For your convenience, the face geometry pipeline calculator is bundled together
-with corresponding metadata into a unified MediaPipe
+For your convenience, this calculator is bundled together with corresponding
+metadata into a unified MediaPipe
 [subgraph](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_geometry/face_geometry_from_landmarks.pbtxt).
-The face geometry format is defined as a Protocol Buffer
+The face transform format is defined as a Protocol Buffer
 [message](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_geometry/protos/face_geometry.proto).
 
 #### Effect Renderer
@@ -227,7 +227,7 @@ The effect renderer is implemented as a MediaPipe
 
 | ![face_geometry_renderer.gif](../images/face_geometry_renderer.gif)     |
 | :---------------------------------------------------------------------: |
-| *Fig 5. An example of face effects rendered by the Face Geometry Effect Renderer.* |
+| *Fig 5. An example of face effects rendered by the Face Transform Effect Renderer.* |
 
 ## Solution APIs
 

docs/solutions/object_detection.md

@@ -116,7 +116,7 @@ on how to build MediaPipe examples.
 
     Note: The following runs TensorFlow inference on CPU. If you would like to
     run inference on GPU (Linux only), please follow
-    [TensorFlow CUDA Support and Setup on Linux Desktop](gpu.md#tensorflow-cuda-support-and-setup-on-linux-desktop)
+    [TensorFlow CUDA Support and Setup on Linux Desktop](../getting_started/gpu_support.md#tensorflow-cuda-support-and-setup-on-linux-desktop)
     instead.
 
     To build the TensorFlow CPU inference example on desktop, run:

docs/solutions/objectron.md

@@ -384,7 +384,7 @@ Supported configuration options:
   <meta charset="utf-8">
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/camera_utils/camera_utils.js" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/control_utils/control_utils.js" crossorigin="anonymous"></script>
-  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/drawing_utils/control_utils_3d.js" crossorigin="anonymous"></script>
+  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/control_utils_3d/control_utils_3d.js" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/drawing_utils/drawing_utils.js" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/objectron/objectron.js" crossorigin="anonymous"></script>
 </head>

docs/solutions/pose.md

@@ -359,7 +359,7 @@ Supported configuration options:
   <meta charset="utf-8">
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/camera_utils/camera_utils.js" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/control_utils/control_utils.js" crossorigin="anonymous"></script>
-  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/drawing_utils/control_utils_3d.js" crossorigin="anonymous"></script>
+  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/control_utils_3d/control_utils_3d.js" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/drawing_utils/drawing_utils.js" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/@mediapipe/pose/pose.js" crossorigin="anonymous"></script>
 </head>

docs/tools/tracing_and_profiling.md

@@ -258,13 +258,14 @@ Many of the following settings are advanced and not recommended for general
 usage. Consult [Enabling tracing and profiling](#enabling-tracing-and-profiling)
 for a friendlier introduction.
 
-histogram_interval_size_usec :Specifies the size of the runtimes histogram
-intervals (in microseconds) to generate the histogram of the Process() time. The
-last interval extends to +inf. If not specified, the interval is 1000000 usec =
-1 sec.
+histogram_interval_size_usec
+:   Specifies the size of the runtimes histogram intervals (in microseconds) to
+    generate the histogram of the `Process()` time. The last interval extends to
+    +inf. If not specified, the interval is 1000000 usec = 1 sec.
 
-num_histogram_intervals :Specifies the number of intervals to generate the
-histogram of the `Process()` runtime. If not specified, one interval is used.
+num_histogram_intervals
+:   Specifies the number of intervals to generate the histogram of the
+    `Process()` runtime. If not specified, one interval is used.
 
 enable_profiler
 :   If true, the profiler starts profiling when graph is initialized.
@@ -288,7 +289,7 @@ trace_event_types_disabled
 
 trace_log_path
 :   The output directory and base-name prefix for trace log files. Log files are
-    written to: StrCat(trace_log_path, index, "`.binarypb`")
+    written to: `StrCat(trace_log_path, index, ".binarypb")`
 
 trace_log_count
 :   The number of trace log files retained. The trace log files are named
@@ -310,8 +311,8 @@ trace_log_instant_events
 
 trace_log_interval_count
 :   The number of trace log intervals per file. The total log duration is:
-    `trace_log_interval_usec * trace_log_file_count * trace_log_interval_count`.
-    The default value specifies 10 intervals per file.
+    `trace_log_interval_usec * trace_log_count * trace_log_interval_count`. The
+    default value specifies 10 intervals per file.
 
 trace_log_disabled
 :   An option to turn ON/OFF writing trace files to disk. Saving trace files to

mediapipe/BUILD

@@ -75,6 +75,7 @@ alias(
     actual = select({
         ":macos_i386": ":macos_i386",
         ":macos_x86_64": ":macos_x86_64",
+        ":macos_arm64": ":macos_arm64",
         "//conditions:default": ":macos_i386",  # Arbitrarily chosen from above.
     }),
     visibility = ["//visibility:public"],
@@ -119,6 +120,15 @@ config_setting(
     visibility = ["//visibility:public"],
 )
 
+config_setting(
+    name = "macos_arm64",
+    values = {
+        "apple_platform_type": "macos",
+        "cpu": "darwin_arm64",
+    },
+    visibility = ["//visibility:public"],
+)
+
 [
     config_setting(
         name = arch,

mediapipe/calculators/audio/BUILD

@@ -244,6 +244,7 @@ cc_test(
         "//mediapipe/framework/formats:time_series_header_cc_proto",
         "//mediapipe/framework/port:gtest_main",
         "//mediapipe/framework/port:parse_text_proto",
+        "//mediapipe/framework/tool:test_util",
         "@com_google_absl//absl/flags:flag",
     ],
 )

mediapipe/calculators/audio/audio_decoder_calculator_test.cc

@@ -20,8 +20,12 @@
 #include "mediapipe/framework/port/gtest.h"
 #include "mediapipe/framework/port/parse_text_proto.h"
 #include "mediapipe/framework/port/status_matchers.h"
+#include "mediapipe/framework/tool/test_util.h"
 
 namespace mediapipe {
+namespace {
+
+constexpr char kTestPackageRoot[] = "mediapipe/calculators/audio";
 
 TEST(AudioDecoderCalculatorTest, TestWAV) {
   CalculatorGraphConfig::Node node_config =
@@ -37,9 +41,8 @@ TEST(AudioDecoderCalculatorTest, TestWAV) {
         })pb");
   CalculatorRunner runner(node_config);
   runner.MutableSidePackets()->Tag("INPUT_FILE_PATH") = MakePacket<std::string>(
-      file::JoinPath("./",
-                     "/mediapipe/calculators/audio/"
-                     "testdata/sine_wave_1k_44100_mono_2_sec_wav.audio"));
+      file::JoinPath(GetTestDataDir(kTestPackageRoot),
+                     "sine_wave_1k_44100_mono_2_sec_wav.audio"));
   MP_ASSERT_OK(runner.Run());
   MP_EXPECT_OK(runner.Outputs()
                    .Tag("AUDIO_HEADER")
@@ -68,9 +71,8 @@ TEST(AudioDecoderCalculatorTest, Test48KWAV) {
         })pb");
   CalculatorRunner runner(node_config);
   runner.MutableSidePackets()->Tag("INPUT_FILE_PATH") = MakePacket<std::string>(
-      file::JoinPath("./",
-                     "/mediapipe/calculators/audio/"
-                     "testdata/sine_wave_1k_48000_stereo_2_sec_wav.audio"));
+      file::JoinPath(GetTestDataDir(kTestPackageRoot),
+                     "sine_wave_1k_48000_stereo_2_sec_wav.audio"));
   MP_ASSERT_OK(runner.Run());
   MP_EXPECT_OK(runner.Outputs()
                    .Tag("AUDIO_HEADER")
@@ -99,9 +101,8 @@ TEST(AudioDecoderCalculatorTest, TestMP3) {
         })pb");
   CalculatorRunner runner(node_config);
   runner.MutableSidePackets()->Tag("INPUT_FILE_PATH") = MakePacket<std::string>(
-      file::JoinPath("./",
-                     "/mediapipe/calculators/audio/"
-                     "testdata/sine_wave_1k_44100_stereo_2_sec_mp3.audio"));
+      file::JoinPath(GetTestDataDir(kTestPackageRoot),
+                     "sine_wave_1k_44100_stereo_2_sec_mp3.audio"));
   MP_ASSERT_OK(runner.Run());
   MP_EXPECT_OK(runner.Outputs()
                    .Tag("AUDIO_HEADER")
@@ -130,9 +131,8 @@ TEST(AudioDecoderCalculatorTest, TestAAC) {
         })pb");
   CalculatorRunner runner(node_config);
   runner.MutableSidePackets()->Tag("INPUT_FILE_PATH") = MakePacket<std::string>(
-      file::JoinPath("./",
-                     "/mediapipe/calculators/audio/"
-                     "testdata/sine_wave_1k_44100_stereo_2_sec_aac.audio"));
+      file::JoinPath(GetTestDataDir(kTestPackageRoot),
+                     "sine_wave_1k_44100_stereo_2_sec_aac.audio"));
   MP_ASSERT_OK(runner.Run());
   MP_EXPECT_OK(runner.Outputs()
                    .Tag("AUDIO_HEADER")
@@ -147,4 +147,5 @@ TEST(AudioDecoderCalculatorTest, TestAAC) {
               std::ceil(44100.0 * 2 / 1024));
 }
 
+}  // namespace
 }  // namespace mediapipe

mediapipe/calculators/audio/spectrogram_calculator.cc

@@ -20,24 +20,22 @@
 #include <memory>
 #include <string>
 
-#include "Eigen/Core"
 #include "absl/strings/string_view.h"
 #include "audio/dsp/spectrogram/spectrogram.h"
 #include "audio/dsp/window_functions.h"
 #include "mediapipe/calculators/audio/spectrogram_calculator.pb.h"
 #include "mediapipe/framework/calculator_framework.h"
 #include "mediapipe/framework/formats/matrix.h"
-#include "mediapipe/framework/formats/time_series_header.pb.h"
-#include "mediapipe/framework/port/core_proto_inc.h"
-#include "mediapipe/framework/port/integral_types.h"
 #include "mediapipe/framework/port/logging.h"
-#include "mediapipe/framework/port/ret_check.h"
-#include "mediapipe/framework/port/source_location.h"
 #include "mediapipe/framework/port/status_builder.h"
 #include "mediapipe/util/time_series_util.h"
 
 namespace mediapipe {
 
+namespace {
+constexpr char kFrameDurationTag[] = "FRAME_DURATION";
+constexpr char kFrameOverlapTag[] = "FRAME_OVERLAP";
+}  // namespace
 // MediaPipe Calculator for computing the "spectrogram" (short-time Fourier
 // transform squared-magnitude, by default) of a multichannel input
 // time series, including optionally overlapping frames.  Options are
@@ -46,11 +44,14 @@ namespace mediapipe {
 //
 // Result is a MatrixData record (for single channel input and when the
 // allow_multichannel_input flag is false), or a vector of MatrixData records,
-// one for each channel (when the allow_multichannel_input flag is set). The
-// rows of each spectrogram matrix correspond to the n_fft/2+1 unique complex
-// values, or squared/linear/dB magnitudes, depending on the output_type option.
-// Each input packet will result in zero or one output packets, each containing
-// one Matrix for each channel of the input, where each Matrix has one or more
+// one for each channel (when the allow_multichannel_input flag is set). Each
+// waveform frame is converted to frequency by a fast Fourier transform whose
+// size, n_fft, is the smallest power of two large enough to enclose the frame
+// length of round(frame_duration_seconds * sample_rate).The rows of each
+// spectrogram matrix(result) correspond to the n_fft/2+1 unique complex values,
+// or squared/linear/dB magnitudes, depending on the output_type option. Each
+// input packet will result in zero or one output packets, each containing one
+// Matrix for each channel of the input, where each Matrix has one or more
 // columns of spectral values, one for each complete frame of input samples. If
 // the input packet contains too few samples to trigger a new output frame, no
 // output packet is generated (since zero-length packets are not legal since
@@ -71,6 +72,22 @@ class SpectrogramCalculator : public CalculatorBase {
         // Input stream with TimeSeriesHeader.
     );
 
+    if (cc->InputSidePackets().HasTag(kFrameDurationTag)) {
+      cc->InputSidePackets()
+          .Tag(kFrameDurationTag)
+          .Set<double>(
+              // Optional side packet for frame_duration_seconds if provided.
+          );
+    }
+
+    if (cc->InputSidePackets().HasTag(kFrameOverlapTag)) {
+      cc->InputSidePackets()
+          .Tag(kFrameOverlapTag)
+          .Set<double>(
+              // Optional side packet for frame_overlap_seconds if provided.
+          );
+    }
+
     SpectrogramCalculatorOptions spectrogram_options =
         cc->Options<SpectrogramCalculatorOptions>();
     if (!spectrogram_options.allow_multichannel_input()) {
@@ -184,27 +201,47 @@ class SpectrogramCalculator : public CalculatorBase {
   // Fixed scale factor applied to output values (regardless of type).
   double output_scale_;
 
-  static const float kLnPowerToDb;
+  static const float kLnSquaredMagnitudeToDb;
 };
 REGISTER_CALCULATOR(SpectrogramCalculator);
 
-// Factor to convert ln(magnitude_squared) to deciBels = 10.0/ln(10.0).
-const float SpectrogramCalculator::kLnPowerToDb = 4.342944819032518;
+// DECIBELS = 20*log10(LINEAR_MAGNITUDE) = 10*Log10(SQUARED_MAGNITUDE)
+// =10/ln(10)*ln(SQUARED_MAGNITUDE).
+// Factor to convert ln(SQUARED_MAGNITUDE) to deciBels = 10.0/ln(10.0).
+const float SpectrogramCalculator::kLnSquaredMagnitudeToDb = 4.342944819032518;
 
 absl::Status SpectrogramCalculator::Open(CalculatorContext* cc) {
   SpectrogramCalculatorOptions spectrogram_options =
       cc->Options<SpectrogramCalculatorOptions>();
+  // Provide frame_duration_seconds and frame_overlap_seconds either from static
+  // options, or dynamically from a side packet, the side packet one will
+  // override the options one if provided.
+
+  double frame_duration_seconds = 0;
+  double frame_overlap_seconds = 0;
+  if (cc->InputSidePackets().HasTag(kFrameDurationTag)) {
+    frame_duration_seconds =
+        cc->InputSidePackets().Tag(kFrameDurationTag).Get<double>();
+  } else {
+    frame_duration_seconds = spectrogram_options.frame_duration_seconds();
+  }
+
+  if (cc->InputSidePackets().HasTag(kFrameOverlapTag)) {
+    frame_overlap_seconds =
+        cc->InputSidePackets().Tag(kFrameOverlapTag).Get<double>();
+  } else {
+    frame_overlap_seconds = spectrogram_options.frame_overlap_seconds();
+  }
 
   use_local_timestamp_ = spectrogram_options.use_local_timestamp();
 
-  if (spectrogram_options.frame_duration_seconds() <= 0.0) {
+  if (frame_duration_seconds <= 0.0) {
     // TODO: return an error.
   }
-  if (spectrogram_options.frame_overlap_seconds() >=
-      spectrogram_options.frame_duration_seconds()) {
+  if (frame_overlap_seconds >= frame_duration_seconds) {
     // TODO: return an error.
   }
-  if (spectrogram_options.frame_overlap_seconds() < 0.0) {
+  if (frame_overlap_seconds < 0.0) {
     // TODO: return an error.
   }
 
@@ -220,10 +257,8 @@ absl::Status SpectrogramCalculator::Open(CalculatorContext* cc) {
     // TODO: return an error.
   }
 
-  frame_duration_samples_ =
-      round(spectrogram_options.frame_duration_seconds() * input_sample_rate_);
-  frame_overlap_samples_ =
-      round(spectrogram_options.frame_overlap_seconds() * input_sample_rate_);
+  frame_duration_samples_ = round(frame_duration_seconds * input_sample_rate_);
+  frame_overlap_samples_ = round(frame_overlap_seconds * input_sample_rate_);
 
   pad_final_packet_ = spectrogram_options.pad_final_packet();
   output_type_ = spectrogram_options.output_type();
@@ -419,7 +454,7 @@ absl::Status SpectrogramCalculator::ProcessVector(const Matrix& input_stream,
       return ProcessVectorToOutput(
           input_stream,
           +[](const Matrix& col) -> const Matrix {
-            return kLnPowerToDb * col.array().log().matrix();
+            return kLnSquaredMagnitudeToDb * col.array().log().matrix();
           }, cc);
     }
     // clang-format on

mediapipe/calculators/audio/spectrogram_calculator.proto

@@ -32,7 +32,11 @@ message SpectrogramCalculatorOptions {
 
   // Duration of overlap between adjacent windows.
   // Hence, frame_rate = 1/(frame_duration_seconds - frame_overlap_seconds).
-  // Required that 0 <= frame_overlap_seconds <  frame_duration_seconds.
+  // Note the frame_rate here is not the MediaPipe packet rate, the frame here
+  // means each Fourier transform analysis waveform frame, the output MediaPipe
+  // packet rate will the the same as input, if frame rate is lower than input
+  // packet rate, will result in intermittent empty output packets. Required
+  // that 0 <= frame_overlap_seconds <  frame_duration_seconds.
   optional double frame_overlap_seconds = 2 [default = 0.0];
 
   // Whether to pad the final packet with zeros.  If true, guarantees that
@@ -42,6 +46,11 @@ message SpectrogramCalculatorOptions {
 
   // Output value type can be squared-magnitude, linear-magnitude,
   // deciBels (dB, = 20*log10(linear_magnitude)), or std::complex.
+  // Their relationship:
+  // COMPLEX c = Re + Im*i;
+  // SQUARED_MAGNITUDE = Re^2 + Im^2;
+  // LINEAR_MAGNITUDE = sqrt(SQUARED_MAGNITUDE);
+  // DECIBELS = 20*log10(LINEAR_MAGNITUDE) = 10*log10(SQUARED_MAGNITUDE);
   enum OutputType {
     SQUARED_MAGNITUDE = 0;
     LINEAR_MAGNITUDE = 1;

mediapipe/calculators/core/BUILD

@@ -117,6 +117,7 @@ mediapipe_proto_library(
         "//mediapipe/framework:calculator_options_proto",
         "//mediapipe/framework:calculator_proto",
         "//mediapipe/framework/formats:classification_proto",
+        "//mediapipe/framework/formats:landmark_proto",
     ],
 )
 
@@ -213,6 +214,7 @@ cc_library(
         "//mediapipe/framework:collection_item_id",
         "//mediapipe/framework:packet",
         "//mediapipe/framework/formats:classification_cc_proto",
+        "//mediapipe/framework/formats:detection_cc_proto",
         "//mediapipe/framework/formats:landmark_cc_proto",
         "//mediapipe/framework/formats:rect_cc_proto",
         "//mediapipe/framework/port:integral_types",
@@ -309,8 +311,8 @@ cc_library(
 )
 
 cc_library(
-    name = "concatenate_normalized_landmark_list_calculator",
-    srcs = ["concatenate_normalized_landmark_list_calculator.cc"],
+    name = "concatenate_proto_list_calculator",
+    srcs = ["concatenate_proto_list_calculator.cc"],
     visibility = ["//visibility:public"],
     deps = [
         ":concatenate_vector_calculator_cc_proto",
@@ -324,10 +326,10 @@ cc_library(
 )
 
 cc_test(
-    name = "concatenate_normalized_landmark_list_calculator_test",
-    srcs = ["concatenate_normalized_landmark_list_calculator_test.cc"],
+    name = "concatenate_proto_list_calculator_test",
+    srcs = ["concatenate_proto_list_calculator_test.cc"],
     deps = [
-        ":concatenate_normalized_landmark_list_calculator",
+        ":concatenate_proto_list_calculator",
         ":concatenate_vector_calculator_cc_proto",
         "//mediapipe/framework:calculator_framework",
         "//mediapipe/framework:calculator_runner",
@@ -555,6 +557,22 @@ cc_library(
     alwayslink = 1,
 )
 
+cc_test(
+    name = "packet_cloner_calculator_test",
+    srcs = ["packet_cloner_calculator_test.cc"],
+    deps = [
+        ":packet_cloner_calculator",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework:timestamp",
+        "//mediapipe/framework/port:gtest_main",
+        "//mediapipe/framework/port:parse_text_proto",
+        "//mediapipe/framework/port:status",
+        "//mediapipe/framework/stream_handler:immediate_input_stream_handler",
+        "//mediapipe/framework/tool:sink",
+        "@com_google_absl//absl/strings",
+    ],
+)
+
 cc_library(
     name = "packet_inner_join_calculator",
     srcs = ["packet_inner_join_calculator.cc"],
@@ -964,8 +982,8 @@ cc_test(
 )
 
 cc_library(
-    name = "split_landmarks_calculator",
-    srcs = ["split_landmarks_calculator.cc"],
+    name = "split_proto_list_calculator",
+    srcs = ["split_proto_list_calculator.cc"],
     visibility = ["//visibility:public"],
     deps = [
         ":split_vector_calculator_cc_proto",
@@ -979,10 +997,10 @@ cc_library(
 )
 
 cc_test(
-    name = "split_landmarks_calculator_test",
-    srcs = ["split_landmarks_calculator_test.cc"],
+    name = "split_proto_list_calculator_test",
+    srcs = ["split_proto_list_calculator_test.cc"],
     deps = [
-        ":split_landmarks_calculator",
+        ":split_proto_list_calculator",
         ":split_vector_calculator_cc_proto",
         "//mediapipe/framework:calculator_framework",
         "//mediapipe/framework:calculator_runner",
@@ -1195,6 +1213,7 @@ cc_library(
         "//mediapipe/framework:calculator_framework",
         "//mediapipe/framework:collection_item_id",
         "//mediapipe/framework/formats:classification_cc_proto",
+        "//mediapipe/framework/formats:landmark_cc_proto",
         "//mediapipe/framework/port:integral_types",
         "//mediapipe/framework/port:ret_check",
         "//mediapipe/framework/port:status",
@@ -1255,3 +1274,36 @@ cc_test(
         "@com_google_absl//absl/time",
     ],
 )
+
+cc_library(
+    name = "get_vector_item_calculator",
+    srcs = ["get_vector_item_calculator.cc"],
+    hdrs = ["get_vector_item_calculator.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework:packet",
+        "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/api2:port",
+        "//mediapipe/framework/formats:classification_cc_proto",
+        "//mediapipe/framework/formats:landmark_cc_proto",
+        "//mediapipe/framework/port:ret_check",
+        "//mediapipe/framework/port:status",
+    ],
+    alwayslink = 1,
+)
+
+cc_library(
+    name = "vector_size_calculator",
+    srcs = ["vector_size_calculator.cc"],
+    hdrs = ["vector_size_calculator.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/formats:classification_cc_proto",
+        "//mediapipe/framework/formats:landmark_cc_proto",
+        "//mediapipe/framework/port:status",
+    ],
+    alwayslink = 1,
+)

mediapipe/calculators/core/begin_loop_calculator.cc

@@ -28,6 +28,10 @@ typedef BeginLoopCalculator<std::vector<::mediapipe::NormalizedLandmarkList>>
     BeginLoopNormalizedLandmarkListVectorCalculator;
 REGISTER_CALCULATOR(BeginLoopNormalizedLandmarkListVectorCalculator);
 
+// A calculator to process std::vector<int>.
+typedef BeginLoopCalculator<std::vector<int>> BeginLoopIntCalculator;
+REGISTER_CALCULATOR(BeginLoopIntCalculator);
+
 // A calculator to process std::vector<NormalizedRect>.
 typedef BeginLoopCalculator<std::vector<::mediapipe::NormalizedRect>>
     BeginLoopNormalizedRectCalculator;

mediapipe/calculators/core/concatenate_normalized_landmark_list_calculator.cc

@@ -1,79 +0,0 @@
-// Copyright 2019 The MediaPipe Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef MEDIAPIPE_CALCULATORS_CORE_CONCATENATE_NORMALIZED_LIST_CALCULATOR_H_  // NOLINT
-#define MEDIAPIPE_CALCULATORS_CORE_CONCATENATE_NORMALIZED_LIST_CALCULATOR_H_  // NOLINT
-
-#include "mediapipe/calculators/core/concatenate_vector_calculator.pb.h"
-#include "mediapipe/framework/api2/node.h"
-#include "mediapipe/framework/calculator_framework.h"
-#include "mediapipe/framework/formats/landmark.pb.h"
-#include "mediapipe/framework/port/canonical_errors.h"
-#include "mediapipe/framework/port/ret_check.h"
-#include "mediapipe/framework/port/status.h"
-
-namespace mediapipe {
-namespace api2 {
-
-// Concatenates several NormalizedLandmarkList protos following stream index
-// order. This class assumes that every input stream contains a
-// NormalizedLandmarkList proto object.
-class ConcatenateNormalizedLandmarkListCalculator : public Node {
- public:
-  static constexpr Input<NormalizedLandmarkList>::Multiple kIn{""};
-  static constexpr Output<NormalizedLandmarkList> kOut{""};
-
-  MEDIAPIPE_NODE_CONTRACT(kIn, kOut);
-
-  static absl::Status UpdateContract(CalculatorContract* cc) {
-    RET_CHECK_GE(kIn(cc).Count(), 1);
-    return absl::OkStatus();
-  }
-
-  absl::Status Open(CalculatorContext* cc) override {
-    only_emit_if_all_present_ =
-        cc->Options<::mediapipe::ConcatenateVectorCalculatorOptions>()
-            .only_emit_if_all_present();
-    return absl::OkStatus();
-  }
-
-  absl::Status Process(CalculatorContext* cc) override {
-    if (only_emit_if_all_present_) {
-      for (const auto& input : kIn(cc)) {
-        if (input.IsEmpty()) return absl::OkStatus();
-      }
-    }
-
-    NormalizedLandmarkList output;
-    for (const auto& input : kIn(cc)) {
-      if (input.IsEmpty()) continue;
-      const NormalizedLandmarkList& list = *input;
-      for (int j = 0; j < list.landmark_size(); ++j) {
-        *output.add_landmark() = list.landmark(j);
-      }
-    }
-    kOut(cc).Send(std::move(output));
-    return absl::OkStatus();
-  }
-
- private:
-  bool only_emit_if_all_present_;
-};
-MEDIAPIPE_REGISTER_NODE(ConcatenateNormalizedLandmarkListCalculator);
-
-}  // namespace api2
-}  // namespace mediapipe
-
-// NOLINTNEXTLINE
-#endif  // MEDIAPIPE_CALCULATORS_CORE_CONCATENATE_NORMALIZED_LIST_CALCULATOR_H_

mediapipe/calculators/core/concatenate_proto_list_calculator.cc

@@ -0,0 +1,118 @@
+// Copyright 2019 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_CORE_CONCATENATE_PROTO_LIST_CALCULATOR_H_  // NOLINT
+#define MEDIAPIPE_CALCULATORS_CORE_CONCATENATE_PROTO_LIST_CALCULATOR_H_  // NOLINT
+
+#include "mediapipe/calculators/core/concatenate_vector_calculator.pb.h"
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+#include "mediapipe/framework/port/canonical_errors.h"
+#include "mediapipe/framework/port/ret_check.h"
+#include "mediapipe/framework/port/status.h"
+
+namespace mediapipe {
+namespace api2 {
+
+// Concatenate several input packets of ListType with a repeated field of
+// ItemType into a single output packet of ListType following stream index
+// order.
+template <typename ItemType, typename ListType>
+class ConcatenateListsCalculator : public Node {
+ public:
+  static constexpr typename Input<ListType>::Multiple kIn{""};
+  static constexpr Output<ListType> kOut{""};
+
+  MEDIAPIPE_NODE_CONTRACT(kIn, kOut);
+
+  static absl::Status UpdateContract(CalculatorContract* cc) {
+    RET_CHECK_GE(kIn(cc).Count(), 1);
+    return absl::OkStatus();
+  }
+
+  absl::Status Open(CalculatorContext* cc) override {
+    only_emit_if_all_present_ =
+        cc->Options<::mediapipe::ConcatenateVectorCalculatorOptions>()
+            .only_emit_if_all_present();
+    return absl::OkStatus();
+  }
+
+  absl::Status Process(CalculatorContext* cc) override {
+    if (only_emit_if_all_present_) {
+      for (const auto& input : kIn(cc)) {
+        if (input.IsEmpty()) return absl::OkStatus();
+      }
+    }
+
+    ListType output;
+    for (const auto& input : kIn(cc)) {
+      if (input.IsEmpty()) continue;
+      const ListType& list = *input;
+      for (int j = 0; j < ListSize(list); ++j) {
+        *AddItem(output) = GetItem(list, j);
+      }
+    }
+    kOut(cc).Send(std::move(output));
+    return absl::OkStatus();
+  }
+
+ protected:
+  virtual int ListSize(const ListType& list) const = 0;
+  virtual const ItemType GetItem(const ListType& list, int idx) const = 0;
+  virtual ItemType* AddItem(ListType& list) const = 0;
+
+ private:
+  bool only_emit_if_all_present_;
+};
+
+// TODO: Move calculators to separate *.cc files
+
+class ConcatenateNormalizedLandmarkListCalculator
+    : public ConcatenateListsCalculator<NormalizedLandmark,
+                                        NormalizedLandmarkList> {
+ protected:
+  int ListSize(const NormalizedLandmarkList& list) const override {
+    return list.landmark_size();
+  }
+  const NormalizedLandmark GetItem(const NormalizedLandmarkList& list,
+                                   int idx) const override {
+    return list.landmark(idx);
+  }
+  NormalizedLandmark* AddItem(NormalizedLandmarkList& list) const override {
+    return list.add_landmark();
+  }
+};
+MEDIAPIPE_REGISTER_NODE(ConcatenateNormalizedLandmarkListCalculator);
+
+class ConcatenateLandmarkListCalculator
+    : public ConcatenateListsCalculator<Landmark, LandmarkList> {
+ protected:
+  int ListSize(const LandmarkList& list) const override {
+    return list.landmark_size();
+  }
+  const Landmark GetItem(const LandmarkList& list, int idx) const override {
+    return list.landmark(idx);
+  }
+  Landmark* AddItem(LandmarkList& list) const override {
+    return list.add_landmark();
+  }
+};
+MEDIAPIPE_REGISTER_NODE(ConcatenateLandmarkListCalculator);
+
+}  // namespace api2
+}  // namespace mediapipe
+
+// NOLINTNEXTLINE
+#endif  // MEDIAPIPE_CALCULATORS_CORE_CONCATENATE_PROTO_LIST_CALCULATOR_H_

mediapipe/calculators/core/concatenate_vector_calculator.cc

@@ -73,8 +73,17 @@ typedef ConcatenateVectorCalculator<::mediapipe::NormalizedLandmark>
     ConcatenateLandmarkVectorCalculator;
 MEDIAPIPE_REGISTER_NODE(ConcatenateLandmarkVectorCalculator);
 
+typedef ConcatenateVectorCalculator<::mediapipe::LandmarkList>
+    ConcatenateLandmarkListVectorCalculator;
+MEDIAPIPE_REGISTER_NODE(ConcatenateLandmarkListVectorCalculator);
+
 typedef ConcatenateVectorCalculator<::mediapipe::NormalizedLandmarkList>
-    ConcatenateLandmarListVectorCalculator;
+    ConcatenateNormalizedLandmarkListVectorCalculator;
+MEDIAPIPE_REGISTER_NODE(ConcatenateNormalizedLandmarkListVectorCalculator);
+
+// For backwards compatibility, keep the version with the typo.
+using ConcatenateLandmarListVectorCalculator =
+    ConcatenateNormalizedLandmarkListVectorCalculator;
 MEDIAPIPE_REGISTER_NODE(ConcatenateLandmarListVectorCalculator);
 
 typedef ConcatenateVectorCalculator<mediapipe::ClassificationList>

mediapipe/calculators/core/constant_side_packet_calculator.cc

@@ -18,6 +18,7 @@
 #include "mediapipe/framework/calculator_framework.h"
 #include "mediapipe/framework/collection_item_id.h"
 #include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
 #include "mediapipe/framework/port/canonical_errors.h"
 #include "mediapipe/framework/port/integral_types.h"
 #include "mediapipe/framework/port/ret_check.h"
@@ -79,6 +80,8 @@ class ConstantSidePacketCalculator : public CalculatorBase {
         packet.Set<uint64>();
       } else if (packet_options.has_classification_list_value()) {
         packet.Set<ClassificationList>();
+      } else if (packet_options.has_landmark_list_value()) {
+        packet.Set<LandmarkList>();
       } else {
         return absl::InvalidArgumentError(
             "None of supported values were specified in options.");
@@ -108,6 +111,9 @@ class ConstantSidePacketCalculator : public CalculatorBase {
       } else if (packet_options.has_classification_list_value()) {
         packet.Set(MakePacket<ClassificationList>(
             packet_options.classification_list_value()));
+      } else if (packet_options.has_landmark_list_value()) {
+        packet.Set(
+            MakePacket<LandmarkList>(packet_options.landmark_list_value()));
       } else {
         return absl::InvalidArgumentError(
             "None of supported values were specified in options.");

mediapipe/calculators/core/constant_side_packet_calculator.proto

@@ -18,6 +18,7 @@ package mediapipe;
 
 import "mediapipe/framework/calculator.proto";
 import "mediapipe/framework/formats/classification.proto";
+import "mediapipe/framework/formats/landmark.proto";
 
 option objc_class_prefix = "MediaPipe";
 
@@ -34,6 +35,7 @@ message ConstantSidePacketCalculatorOptions {
       string string_value = 4;
       uint64 uint64_value = 5;
       ClassificationList classification_list_value = 6;
+      LandmarkList landmark_list_value = 7;
     }
   }
 

mediapipe/calculators/core/end_loop_calculator.cc

@@ -17,6 +17,7 @@
 #include <vector>
 
 #include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/detection.pb.h"
 #include "mediapipe/framework/formats/landmark.pb.h"
 #include "mediapipe/framework/formats/rect.pb.h"
 #include "mediapipe/util/render_data.pb.h"
@@ -50,4 +51,8 @@ REGISTER_CALCULATOR(EndLoopClassificationListCalculator);
 typedef EndLoopCalculator<std::vector<TfLiteTensor>> EndLoopTensorCalculator;
 REGISTER_CALCULATOR(EndLoopTensorCalculator);
 
+typedef EndLoopCalculator<std::vector<::mediapipe::Detection>>
+    EndLoopDetectionCalculator;
+REGISTER_CALCULATOR(EndLoopDetectionCalculator);
+
 }  // namespace mediapipe

mediapipe/calculators/core/flow_limiter_calculator.cc

@@ -32,8 +32,8 @@ constexpr char kOptionsTag[] = "OPTIONS";
 // FlowLimiterCalculator is used to limit the number of frames in flight
 // by dropping input frames when necessary.
 //
-// The input stream "FINISH" is used to signal the FlowLimiterCalculator
-// when a frame is finished processing.  Either a non-empty "FINISH" packet
+// The input stream "FINISHED" is used to signal the FlowLimiterCalculator
+// when a frame is finished processing.  Either a non-empty "FINISHED" packet
 // or a timestamp bound should be received for each processed frame.
 //
 // The combination of `max_in_flight: 1` and `max_in_queue: 1` generally gives

mediapipe/calculators/core/get_vector_item_calculator.cc

@@ -0,0 +1,32 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/calculators/core/get_vector_item_calculator.h"
+
+#include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+
+namespace mediapipe {
+namespace api2 {
+
+using GetLandmarkListVectorItemCalculator =
+    GetVectorItemCalculator<mediapipe::LandmarkList>;
+REGISTER_CALCULATOR(GetLandmarkListVectorItemCalculator);
+
+using GetClassificationListVectorItemCalculator =
+    GetVectorItemCalculator<mediapipe::ClassificationList>;
+REGISTER_CALCULATOR(GetClassificationListVectorItemCalculator);
+
+}  // namespace api2
+}  // namespace mediapipe

mediapipe/calculators/core/get_vector_item_calculator.h

@@ -0,0 +1,77 @@
+// Copyright 2019 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_CORE_GET_VECTOR_ITEM_CALCULATOR_H_
+#define MEDIAPIPE_CALCULATORS_CORE_GET_VECTOR_ITEM_CALCULATOR_H_
+
+#include <optional>
+
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/api2/port.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/packet.h"
+#include "mediapipe/framework/port/ret_check.h"
+#include "mediapipe/framework/port/status.h"
+
+namespace mediapipe {
+namespace api2 {
+
+// A calcutlator to return an item from the vector by its index.
+//
+// Inputs:
+//   VECTOR - std::vector<T>
+//     Vector to take an item from.
+//   INDEX - int
+//     Index of the item to return.
+//
+// Outputs:
+//   ITEM - T
+//     Item from the vector at given index.
+//
+// Example config:
+//   node {
+//     calculator: "Get{SpecificType}VectorItemCalculator"
+//     input_stream: "VECTOR:vector"
+//     input_stream: "INDEX:index"
+//     input_stream: "ITEM:item"
+//   }
+//
+template <typename T>
+class GetVectorItemCalculator : public Node {
+ public:
+  static constexpr Input<std::vector<T>> kIn{"VECTOR"};
+  static constexpr Input<int> kIdx{"INDEX"};
+  static constexpr Output<T> kOut{"ITEM"};
+
+  MEDIAPIPE_NODE_CONTRACT(kIn, kIdx, kOut);
+
+  absl::Status Process(CalculatorContext* cc) final {
+    if (kIn(cc).IsEmpty() || kIdx(cc).IsEmpty()) {
+      return absl::OkStatus();
+    }
+
+    const std::vector<T>& items = kIn(cc).Get();
+    const int idx = kIdx(cc).Get();
+
+    RET_CHECK_LT(idx, items.size());
+    kOut(cc).Send(items[idx]);
+
+    return absl::OkStatus();
+  }
+};
+
+}  // namespace api2
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_CORE_GET_VECTOR_ITEM_CALCULATOR_H_

mediapipe/calculators/core/graph_profile_calculator.cc

@@ -29,6 +29,11 @@ namespace api2 {
 // This calculator periodically copies the GraphProfile from
 // mediapipe::GraphProfiler::CaptureProfile to the "PROFILE" output stream.
 //
+// Similarly to the log files saved by GraphProfiler::WriteProfile when trace
+// logging is enabled, the first captured profile contains the full
+// canonicalized graph config and, if tracing is enabled, calculator names in
+// graph traces. Subsequent profiles omit this information.
+//
 // Example config:
 // node {
 //   calculator: "GraphProfileCalculator"
@@ -50,11 +55,14 @@ class GraphProfileCalculator : public Node {
   absl::Status Process(CalculatorContext* cc) final {
     auto options = cc->Options<::mediapipe::GraphProfileCalculatorOptions>();
 
-    if (prev_profile_ts_ == Timestamp::Unset() ||
+    bool first_profile = prev_profile_ts_ == Timestamp::Unset();
+    if (first_profile ||
         cc->InputTimestamp() - prev_profile_ts_ >= options.profile_interval()) {
       prev_profile_ts_ = cc->InputTimestamp();
       GraphProfile result;
-      MP_RETURN_IF_ERROR(cc->GetProfilingContext()->CaptureProfile(&result));
+      MP_RETURN_IF_ERROR(cc->GetProfilingContext()->CaptureProfile(
+          &result, first_profile ? PopulateGraphConfig::kFull
+                                 : PopulateGraphConfig::kNo));
       kProfileOut(cc).Send(result);
     }
     return absl::OkStatus();

mediapipe/calculators/core/graph_profile_calculator_test.cc

@@ -202,6 +202,8 @@ TEST_F(GraphProfileCalculatorTest, GraphProfile) {
           }
         })pb");
 
+  ASSERT_EQ(output_packets.size(), 2);
+  EXPECT_TRUE(output_packets[0].Get<GraphProfile>().has_config());
   EXPECT_THAT(output_packets[1].Get<GraphProfile>(),
               mediapipe::EqualsProto(expected_profile));
 }

mediapipe/calculators/core/packet_cloner_calculator.cc

@@ -16,9 +16,10 @@
 // For every packet that appears in B, outputs the most recent packet from each
 // of the A_i on a separate stream.
 
+#include <string_view>
 #include <vector>
 
-#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
 #include "mediapipe/calculators/core/packet_cloner_calculator.pb.h"
 #include "mediapipe/framework/calculator_framework.h"
 
@@ -34,7 +35,18 @@ namespace mediapipe {
 //   calculator: "PacketClonerCalculator"
 //   input_stream: "first_base_signal"
 //   input_stream: "second_base_signal"
-//   input_stream: "tick_signal"
+//   input_stream: "tick_signal"  # or input_stream: "TICK:tick_signal"
+//   output_stream: "cloned_first_base_signal"
+//   output_stream: "cloned_second_base_signal"
+// }
+//
+// Or you can use "TICK" tag and put corresponding input stream at any location,
+// for example at the very beginning:
+// node {
+//   calculator: "PacketClonerCalculator"
+//   input_stream: "TICK:tick_signal"
+//   input_stream: "first_base_signal"
+//   input_stream: "second_base_signal"
 //   output_stream: "cloned_first_base_signal"
 //   output_stream: "cloned_second_base_signal"
 // }
@@ -46,12 +58,13 @@ namespace mediapipe {
 class PacketClonerCalculator : public CalculatorBase {
  public:
   static absl::Status GetContract(CalculatorContract* cc) {
-    const int tick_signal_index = cc->Inputs().NumEntries() - 1;
-    for (int i = 0; i < tick_signal_index; ++i) {
-      cc->Inputs().Index(i).SetAny();
-      cc->Outputs().Index(i).SetSameAs(&cc->Inputs().Index(i));
+    const Ids ids = GetIds(*cc);
+    for (const auto& in_out : ids.inputs_outputs) {
+      auto& input = cc->Inputs().Get(in_out.in);
+      input.SetAny();
+      cc->Outputs().Get(in_out.out).SetSameAs(&input);
     }
-    cc->Inputs().Index(tick_signal_index).SetAny();
+    cc->Inputs().Get(ids.tick_id).SetAny();
     return absl::OkStatus();
   }
 
@@ -65,13 +78,15 @@ class PacketClonerCalculator : public CalculatorBase {
     output_empty_packets_before_all_inputs_received_ =
         calculator_options.output_packets_only_when_all_inputs_received();
 
-    // Parse input streams.
-    tick_signal_index_ = cc->Inputs().NumEntries() - 1;
-    current_.resize(tick_signal_index_);
+    // Prepare input and output ids.
+    ids_ = GetIds(*cc);
+    current_.resize(ids_.inputs_outputs.size());
+
     // Pass along the header for each stream if present.
-    for (int i = 0; i < tick_signal_index_; ++i) {
-      if (!cc->Inputs().Index(i).Header().IsEmpty()) {
-        cc->Outputs().Index(i).SetHeader(cc->Inputs().Index(i).Header());
+    for (const auto& in_out : ids_.inputs_outputs) {
+      auto& input = cc->Inputs().Get(in_out.in);
+      if (!input.Header().IsEmpty()) {
+        cc->Outputs().Get(in_out.out).SetHeader(input.Header());
       }
     }
     return absl::OkStatus();
@@ -79,17 +94,18 @@ class PacketClonerCalculator : public CalculatorBase {
 
   absl::Status Process(CalculatorContext* cc) final {
     // Store input signals.
-    for (int i = 0; i < tick_signal_index_; ++i) {
-      if (!cc->Inputs().Index(i).Value().IsEmpty()) {
-        current_[i] = cc->Inputs().Index(i).Value();
+    for (int i = 0; i < ids_.inputs_outputs.size(); ++i) {
+      const auto& input = cc->Inputs().Get(ids_.inputs_outputs[i].in);
+      if (!input.IsEmpty()) {
+        current_[i] = input.Value();
       }
     }
 
     // Output according to the TICK signal.
-    if (!cc->Inputs().Index(tick_signal_index_).Value().IsEmpty()) {
+    if (!cc->Inputs().Get(ids_.tick_id).IsEmpty()) {
       if (output_only_when_all_inputs_received_) {
         // Return if one of the input is null.
-        for (int i = 0; i < tick_signal_index_; ++i) {
+        for (int i = 0; i < ids_.inputs_outputs.size(); ++i) {
           if (current_[i].IsEmpty()) {
             if (output_empty_packets_before_all_inputs_received_) {
               SetAllNextTimestampBounds(cc);
@@ -99,12 +115,12 @@ class PacketClonerCalculator : public CalculatorBase {
         }
       }
       // Output each stream.
-      for (int i = 0; i < tick_signal_index_; ++i) {
+      for (int i = 0; i < ids_.inputs_outputs.size(); ++i) {
+        auto& output = cc->Outputs().Get(ids_.inputs_outputs[i].out);
         if (!current_[i].IsEmpty()) {
-          cc->Outputs().Index(i).AddPacket(
-              current_[i].At(cc->InputTimestamp()));
+          output.AddPacket(current_[i].At(cc->InputTimestamp()));
         } else {
-          cc->Outputs().Index(i).SetNextTimestampBound(
+          output.SetNextTimestampBound(
               cc->InputTimestamp().NextAllowedInStream());
         }
       }
@@ -113,15 +129,44 @@ class PacketClonerCalculator : public CalculatorBase {
   }
 
  private:
+  struct Ids {
+    struct InputOutput {
+      CollectionItemId in;
+      CollectionItemId out;
+    };
+    CollectionItemId tick_id;
+    std::vector<InputOutput> inputs_outputs;
+  };
+
+  template <typename CC>
+  static Ids GetIds(CC& cc) {
+    Ids ids;
+    static constexpr absl::string_view kEmptyTag = "";
+    int num_inputs_to_clone = cc.Inputs().NumEntries(kEmptyTag);
+    static constexpr absl::string_view kTickTag = "TICK";
+    if (cc.Inputs().HasTag(kTickTag)) {
+      ids.tick_id = cc.Inputs().GetId(kTickTag, 0);
+    } else {
+      --num_inputs_to_clone;
+      ids.tick_id = cc.Inputs().GetId(kEmptyTag, num_inputs_to_clone);
+    }
+    for (int i = 0; i < num_inputs_to_clone; ++i) {
+      ids.inputs_outputs.push_back({.in = cc.Inputs().GetId(kEmptyTag, i),
+                                    .out = cc.Outputs().GetId(kEmptyTag, i)});
+    }
+    return ids;
+  }
+
   void SetAllNextTimestampBounds(CalculatorContext* cc) {
-    for (int j = 0; j < tick_signal_index_; ++j) {
-      cc->Outputs().Index(j).SetNextTimestampBound(
-          cc->InputTimestamp().NextAllowedInStream());
+    for (const auto& in_out : ids_.inputs_outputs) {
+      cc->Outputs()
+          .Get(in_out.out)
+          .SetNextTimestampBound(cc->InputTimestamp().NextAllowedInStream());
     }
   }
 
   std::vector<Packet> current_;
-  int tick_signal_index_;
+  Ids ids_;
   bool output_only_when_all_inputs_received_;
   bool output_empty_packets_before_all_inputs_received_;
 };

mediapipe/calculators/core/packet_cloner_calculator_test.cc

@@ -0,0 +1,349 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <algorithm>
+#include <functional>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/strings/str_cat.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/port/gmock.h"
+#include "mediapipe/framework/port/gtest.h"
+#include "mediapipe/framework/port/parse_text_proto.h"
+#include "mediapipe/framework/port/status.h"
+#include "mediapipe/framework/port/status_matchers.h"
+#include "mediapipe/framework/timestamp.h"
+#include "mediapipe/framework/tool/sink.h"
+
+namespace mediapipe {
+namespace {
+
+using ::testing::ElementsAre;
+using ::testing::Eq;
+using ::testing::Value;
+
+MATCHER_P2(IntPacket, value, ts, "") {
+  return Value(arg.template Get<int>(), Eq(value)) &&
+         Value(arg.Timestamp(), Eq(Timestamp(ts)));
+}
+
+MATCHER_P2(FloatPacket, value, ts, "") {
+  return Value(arg.template Get<float>(), Eq(value)) &&
+         Value(arg.Timestamp(), Eq(Timestamp(ts)));
+}
+
+template <typename T>
+absl::Status SendPacket(const std::string& input_name, T value, int ts,
+                        CalculatorGraph& graph) {
+  return graph.AddPacketToInputStream(input_name,
+                                      MakePacket<T>(value).At(Timestamp(ts)));
+}
+
+struct Params {
+  bool use_tick_tag = false;
+};
+
+class PacketClonerCalculatorTest : public testing::TestWithParam<Params> {};
+
+TEST_P(PacketClonerCalculatorTest, ClonesSingleInputSameTimestamps) {
+  CalculatorGraphConfig graph_config =
+      ParseTextProtoOrDie<CalculatorGraphConfig>([&]() {
+        if (GetParam().use_tick_tag) {
+          return R"pb(
+            input_stream: 'in1'
+            input_stream: 'tick'
+            node {
+              calculator: 'PacketClonerCalculator'
+              input_stream: 'in1'
+              input_stream: 'TICK:tick'
+              output_stream: 'out1'
+            })pb";
+        }
+        return R"pb(
+          input_stream: 'in1'
+          input_stream: 'tick'
+          node {
+            calculator: 'PacketClonerCalculator'
+            input_stream: 'in1'
+            input_stream: 'tick'
+            output_stream: 'out1'
+          })pb";
+      }());
+  std::vector<Packet> out1;
+  tool::AddVectorSink("out1", &graph_config, &out1);
+
+  CalculatorGraph graph;
+  MP_ASSERT_OK(graph.Initialize(graph_config, {}));
+  MP_ASSERT_OK(graph.StartRun({}));
+
+  MP_ASSERT_OK(SendPacket("in1", 1, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("tick", 1000, /*ts=*/10000, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  EXPECT_THAT(out1, ElementsAre(IntPacket(1, 10000)));
+}
+
+TEST_P(PacketClonerCalculatorTest, ClonesSingleInputEarlierTimestamps) {
+  CalculatorGraphConfig graph_config =
+      ParseTextProtoOrDie<CalculatorGraphConfig>([&]() {
+        if (GetParam().use_tick_tag) {
+          return R"pb(
+            input_stream: 'in1'
+            input_stream: 'tick'
+            node {
+              calculator: 'PacketClonerCalculator'
+              input_stream: 'in1'
+              input_stream: 'TICK:tick'
+              output_stream: 'out1'
+            })pb";
+        }
+        return R"pb(
+          input_stream: 'in1'
+          input_stream: 'tick'
+          node {
+            calculator: 'PacketClonerCalculator'
+            input_stream: 'in1'
+            input_stream: 'tick'
+            output_stream: 'out1'
+          })pb";
+      }());
+  std::vector<Packet> out1;
+  tool::AddVectorSink("out1", &graph_config, &out1);
+
+  CalculatorGraph graph;
+  MP_ASSERT_OK(graph.Initialize(graph_config, {}));
+  MP_ASSERT_OK(graph.StartRun({}));
+
+  // PacketClonerCalculator is non-ImmediateInputStreamHandler
+  // PacketClonerCalculator waits for "in1" to arrive for ts=5000
+  MP_ASSERT_OK(SendPacket("in1", 1, /*ts=*/5000, graph));
+  // Newer tick at ts=10000, should NOT trigger output for ts=5000
+  // PacketClonerCalculator waits for "in1" to arrive for ts=10000
+  MP_ASSERT_OK(SendPacket("tick", 1000, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("tick", 1001, /*ts=*/10001, graph));
+  MP_ASSERT_OK(SendPacket("tick", 1002, /*ts=*/10002, graph));
+  // Newer "in1" at ts=15000, should trigger output for ts=10000
+  MP_ASSERT_OK(SendPacket("in1", 2, /*ts=*/15000, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  EXPECT_THAT(out1, ElementsAre(IntPacket(1, 10000), IntPacket(1, 10001),
+                                IntPacket(1, 10002)));
+}
+
+TEST_P(PacketClonerCalculatorTest, ClonesFiveInputs) {
+  CalculatorGraphConfig graph_config =
+      ParseTextProtoOrDie<CalculatorGraphConfig>([&]() {
+        if (GetParam().use_tick_tag) {
+          return R"pb(
+            input_stream: 'in1'
+            input_stream: 'in2'
+            input_stream: 'in3'
+            input_stream: 'in4'
+            input_stream: 'in5'
+            input_stream: 'tick'
+            node {
+              calculator: 'PacketClonerCalculator'
+              input_stream: 'in1'
+              input_stream: 'in2'
+              input_stream: 'in3'
+              input_stream: 'in4'
+              input_stream: 'in5'
+              output_stream: 'out1'
+              output_stream: 'out2'
+              output_stream: 'out3'
+              input_stream: 'TICK:tick'  # arbitrary location
+              output_stream: 'out4'
+              output_stream: 'out5'
+            }
+          )pb";
+        }
+        return R"pb(
+          input_stream: 'in1'
+          input_stream: 'in2'
+          input_stream: 'in3'
+          input_stream: 'in4'
+          input_stream: 'in5'
+          input_stream: 'tick'
+          node {
+            calculator: 'PacketClonerCalculator'
+            input_stream: 'in1'
+            input_stream: 'in2'
+            input_stream: 'in3'
+            input_stream: 'in4'
+            input_stream: 'in5'
+            input_stream: 'tick'
+            output_stream: 'out1'
+            output_stream: 'out2'
+            output_stream: 'out3'
+            output_stream: 'out4'
+            output_stream: 'out5'
+          }
+        )pb";
+      }());
+  constexpr int kNumToClone = 5;
+  std::array<std::vector<Packet>, kNumToClone> outs;
+  for (int i = 0; i < kNumToClone; ++i) {
+    tool::AddVectorSink(absl::StrCat("out", i + 1), &graph_config, &outs[i]);
+  }
+
+  CalculatorGraph graph;
+  MP_ASSERT_OK(graph.Initialize(graph_config, {}));
+  MP_ASSERT_OK(graph.StartRun({}));
+
+  MP_ASSERT_OK(SendPacket("in1", 10, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("in2", 20.0f, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("in3", 30, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("in4", 40.0f, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("in5", 50, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("tick", 1000, /*ts=*/10000, graph));
+  // Below "tick" packets won't trigger output, until newer inputs are sent,
+  // because inputs are missing and ImmediateInputStreamHandler is not
+  // configured.
+  MP_ASSERT_OK(SendPacket("tick", 1001, /*ts=*/10001, graph));
+  MP_ASSERT_OK(SendPacket("tick", 1002, /*ts=*/10002, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  EXPECT_THAT(outs, ElementsAre(ElementsAre(IntPacket(10, 10000)),
+                                ElementsAre(FloatPacket(20.0f, 10000)),
+                                ElementsAre(IntPacket(30, 10000)),
+                                ElementsAre(FloatPacket(40.0f, 10000)),
+                                ElementsAre(IntPacket(50, 10000))));
+
+  MP_ASSERT_OK(SendPacket("in1", 100, /*ts=*/20000, graph));
+  MP_ASSERT_OK(SendPacket("in2", 200.0f, /*ts=*/20000, graph));
+  MP_ASSERT_OK(SendPacket("in3", 300, /*ts=*/20000, graph));
+  MP_ASSERT_OK(SendPacket("in4", 400.0f, /*ts=*/20000, graph));
+  MP_ASSERT_OK(SendPacket("in5", 500, /*ts=*/20000, graph));
+  MP_ASSERT_OK(SendPacket("tick", 2000, /*ts=*/20000, graph));
+  // Below "tick" packets won't trigger output, because inputs are missing and
+  // ImmediateInputStreamHandler is not configured.
+  MP_ASSERT_OK(SendPacket("tick", 2001, /*ts=*/20001, graph));
+  MP_ASSERT_OK(SendPacket("tick", 2002, /*ts=*/20002, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  EXPECT_THAT(
+      outs,
+      ElementsAre(
+          ElementsAre(IntPacket(10, 10000), IntPacket(10, 10001),
+                      IntPacket(10, 10002), IntPacket(100, 20000)),
+          ElementsAre(FloatPacket(20.0f, 10000), FloatPacket(20.0f, 10001),
+                      FloatPacket(20.0f, 10002), FloatPacket(200.0f, 20000)),
+          ElementsAre(IntPacket(30, 10000), IntPacket(30, 10001),
+                      IntPacket(30, 10002), IntPacket(300, 20000)),
+          ElementsAre(FloatPacket(40.0f, 10000), FloatPacket(40.0f, 10001),
+                      FloatPacket(40.0f, 10002), FloatPacket(400.0f, 20000)),
+          ElementsAre(IntPacket(50, 10000), IntPacket(50, 10001),
+                      IntPacket(50, 10002), IntPacket(500, 20000))));
+}
+
+TEST_P(PacketClonerCalculatorTest,
+       ClonesTwoInputsWithImmediateInputStreamHandler) {
+  CalculatorGraphConfig graph_config =
+      ParseTextProtoOrDie<CalculatorGraphConfig>([&]() {
+        if (GetParam().use_tick_tag) {
+          return R"pb(
+            input_stream: 'in1'
+            input_stream: 'in2'
+            input_stream: 'tick'
+            node {
+              calculator: 'PacketClonerCalculator'
+              input_stream: 'TICK:tick'
+              input_stream: 'in1'
+              input_stream: 'in2'
+              output_stream: 'out1'
+              output_stream: 'out2'
+              input_stream_handler {
+                input_stream_handler: "ImmediateInputStreamHandler"
+              }
+            })pb";
+        }
+        return R"pb(
+          input_stream: 'in1'
+          input_stream: 'in2'
+          input_stream: 'tick'
+          node {
+            calculator: 'PacketClonerCalculator'
+            input_stream: 'in1'
+            input_stream: 'in2'
+            input_stream: 'tick'
+            output_stream: 'out1'
+            output_stream: 'out2'
+            input_stream_handler {
+              input_stream_handler: "ImmediateInputStreamHandler"
+            }
+          })pb";
+      }());
+  constexpr int kNumToClone = 2;
+  std::array<std::vector<Packet>, kNumToClone> outs;
+  for (int i = 0; i < kNumToClone; ++i) {
+    tool::AddVectorSink(absl::StrCat("out", i + 1), &graph_config, &outs[i]);
+  }
+
+  CalculatorGraph graph;
+  MP_ASSERT_OK(graph.Initialize(graph_config, {}));
+  MP_ASSERT_OK(graph.StartRun({}));
+
+  // No packets to clone.
+  MP_ASSERT_OK(SendPacket("tick", 0, /*ts=*/0, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  // Cloning current packets.
+  MP_ASSERT_OK(SendPacket("in1", 1, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("in2", 10.0f, /*ts=*/10000, graph));
+  MP_ASSERT_OK(SendPacket("tick", 1000, /*ts=*/10000, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  // Cloning past packets.
+  MP_ASSERT_OK(SendPacket("tick", 1500, /*ts=*/15000, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  // Cloning past packets.
+  MP_ASSERT_OK(SendPacket("in1", 2, /*ts=*/10001, graph));
+  MP_ASSERT_OK(SendPacket("in2", 20.0f, /*ts=*/10001, graph));
+  MP_ASSERT_OK(SendPacket("tick", 2000, /*ts=*/20000, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  // Cloning future packets.
+  MP_ASSERT_OK(SendPacket("in1", 3, /*ts=*/30000, graph));
+  MP_ASSERT_OK(SendPacket("in2", 30.0f, /*ts=*/30000, graph));
+  // Waiting to ensure newer packets (ts=30000) to clone would get into the
+  // cloner before tick (ts=25000) does.
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+  MP_ASSERT_OK(SendPacket("tick", 3000, /*ts=*/25000, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  // Cloning packets having different timestamps.
+  MP_ASSERT_OK(SendPacket("in1", 4, /*ts=*/38000, graph));
+  MP_ASSERT_OK(SendPacket("in2", 40.0f, /*ts=*/39000, graph));
+  MP_ASSERT_OK(SendPacket("tick", 4000, /*ts=*/40000, graph));
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  EXPECT_THAT(
+      outs,
+      ElementsAre(
+          ElementsAre(IntPacket(1, 10000), IntPacket(1, 15000),
+                      IntPacket(2, 20000), IntPacket(3, 25000),
+                      IntPacket(4, 40000)),
+          ElementsAre(FloatPacket(10.0f, 10000), FloatPacket(10.0f, 15000),
+                      FloatPacket(20.0f, 20000), FloatPacket(30.0f, 25000),
+                      FloatPacket(40.0f, 40000))));
+}
+
+INSTANTIATE_TEST_SUITE_P(PacketClonerCalculator, PacketClonerCalculatorTest,
+                         testing::ValuesIn({Params{.use_tick_tag = false},
+                                            Params{.use_tick_tag = true}}));
+}  // anonymous namespace
+}  // namespace mediapipe

mediapipe/calculators/core/packet_resampler_calculator.cc

@@ -157,9 +157,7 @@ absl::Status PacketResamplerCalculator::Process(CalculatorContext* cc) {
     }
   }
 
-  if (absl::Status status = strategy_->Process(cc); !status.ok()) {
-    return status;  // Avoid MP_RETURN_IF_ERROR macro for external release.
-  }
+  MP_RETURN_IF_ERROR(strategy_->Process(cc));
 
   last_packet_ = cc->Inputs().Get(input_data_id_).Value();
 

mediapipe/calculators/core/quantize_float_vector_calculator.cc

@@ -23,8 +23,8 @@
 #include "mediapipe/framework/port/canonical_errors.h"
 #include "mediapipe/framework/port/status.h"
 
-// Quantizes a vector of floats to a std::string so that each float becomes a
-// byte in the [0, 255] range. Any value above max_quantized_value or below
+// Quantizes a vector of floats to a string so that each float becomes a byte
+// in the [0, 255] range. Any value above max_quantized_value or below
 // min_quantized_value will be saturated to '/xFF' or '/0'.
 //
 // Example config:

mediapipe/calculators/core/split_proto_list_calculator.cc

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef MEDIAPIPE_CALCULATORS_CORE_SPLIT_LANDMARKS_CALCULATOR_H_  // NOLINT
-#define MEDIAPIPE_CALCULATORS_CORE_SPLIT_LANDMARKS_CALCULATOR_H_  // NOLINT
+#ifndef MEDIAPIPE_CALCULATORS_CORE_SPLIT_PROTO_LIST_CALCULATOR_H_  // NOLINT
+#define MEDIAPIPE_CALCULATORS_CORE_SPLIT_PROTO_LIST_CALCULATOR_H_  // NOLINT
 
 #include "mediapipe/calculators/core/split_vector_calculator.pb.h"
 #include "mediapipe/framework/calculator_framework.h"
@@ -24,30 +24,30 @@
 
 namespace mediapipe {
 
-// Splits an input packet with LandmarkListType into
-// multiple LandmarkListType output packets using the [begin, end) ranges
+// Splits an input packet of ListType with a repeated field of ItemType
+// into multiple ListType output packets using the [begin, end) ranges
 // specified in SplitVectorCalculatorOptions. If the option "element_only" is
 // set to true, all ranges should be of size 1 and all outputs will be elements
-// of type LandmarkType. If "element_only" is false, ranges can be
-// non-zero in size and all outputs will be of type LandmarkListType.
+// of type ItemType. If "element_only" is false, ranges can be
+// non-zero in size and all outputs will be of type ListType.
 // If the option "combine_outputs" is set to true, only one output stream can be
 // specified and all ranges of elements will be combined into one
-// LandmarkListType.
-template <typename LandmarkType, typename LandmarkListType>
-class SplitLandmarksCalculator : public CalculatorBase {
+// ListType.
+template <typename ItemType, typename ListType>
+class SplitListsCalculator : public CalculatorBase {
  public:
   static absl::Status GetContract(CalculatorContract* cc) {
     RET_CHECK(cc->Inputs().NumEntries() == 1);
     RET_CHECK(cc->Outputs().NumEntries() != 0);
 
-    cc->Inputs().Index(0).Set<LandmarkListType>();
+    cc->Inputs().Index(0).Set<ListType>();
 
     const auto& options =
         cc->Options<::mediapipe::SplitVectorCalculatorOptions>();
 
     if (options.combine_outputs()) {
       RET_CHECK_EQ(cc->Outputs().NumEntries(), 1);
-      cc->Outputs().Index(0).Set<LandmarkListType>();
+      cc->Outputs().Index(0).Set<ListType>();
       for (int i = 0; i < options.ranges_size() - 1; ++i) {
         for (int j = i + 1; j < options.ranges_size(); ++j) {
           const auto& range_0 = options.ranges(i);
@@ -82,9 +82,9 @@ class SplitLandmarksCalculator : public CalculatorBase {
             return absl::InvalidArgumentError(
                 "Since element_only is true, all ranges should be of size 1.");
           }
-          cc->Outputs().Index(i).Set<LandmarkType>();
+          cc->Outputs().Index(i).Set<ItemType>();
         } else {
-          cc->Outputs().Index(i).Set<LandmarkListType>();
+          cc->Outputs().Index(i).Set<ListType>();
         }
       }
     }
@@ -111,39 +111,38 @@ class SplitLandmarksCalculator : public CalculatorBase {
   }
 
   absl::Status Process(CalculatorContext* cc) override {
-    const LandmarkListType& input =
-        cc->Inputs().Index(0).Get<LandmarkListType>();
-    RET_CHECK_GE(input.landmark_size(), max_range_end_)
-        << "Max range end " << max_range_end_ << " exceeds landmarks size "
-        << input.landmark_size();
+    const ListType& input = cc->Inputs().Index(0).Get<ListType>();
+    RET_CHECK_GE(ListSize(input), max_range_end_)
+        << "Max range end " << max_range_end_ << " exceeds list size "
+        << ListSize(input);
 
     if (combine_outputs_) {
-      LandmarkListType output;
+      ListType output;
       for (int i = 0; i < ranges_.size(); ++i) {
         for (int j = ranges_[i].first; j < ranges_[i].second; ++j) {
-          const LandmarkType& input_landmark = input.landmark(j);
-          *output.add_landmark() = input_landmark;
+          const ItemType& input_item = GetItem(input, j);
+          *AddItem(output) = input_item;
         }
       }
-      RET_CHECK_EQ(output.landmark_size(), total_elements_);
+      RET_CHECK_EQ(ListSize(output), total_elements_);
       cc->Outputs().Index(0).AddPacket(
-          MakePacket<LandmarkListType>(output).At(cc->InputTimestamp()));
+          MakePacket<ListType>(output).At(cc->InputTimestamp()));
     } else {
       if (element_only_) {
         for (int i = 0; i < ranges_.size(); ++i) {
           cc->Outputs().Index(i).AddPacket(
-              MakePacket<LandmarkType>(input.landmark(ranges_[i].first))
+              MakePacket<ItemType>(GetItem(input, ranges_[i].first))
                   .At(cc->InputTimestamp()));
         }
       } else {
         for (int i = 0; i < ranges_.size(); ++i) {
-          LandmarkListType output;
+          ListType output;
           for (int j = ranges_[i].first; j < ranges_[i].second; ++j) {
-            const LandmarkType& input_landmark = input.landmark(j);
-            *output.add_landmark() = input_landmark;
+            const ItemType& input_item = GetItem(input, j);
+            *AddItem(output) = input_item;
           }
           cc->Outputs().Index(i).AddPacket(
-              MakePacket<LandmarkListType>(output).At(cc->InputTimestamp()));
+              MakePacket<ListType>(output).At(cc->InputTimestamp()));
         }
       }
     }
@@ -151,6 +150,11 @@ class SplitLandmarksCalculator : public CalculatorBase {
     return absl::OkStatus();
   }
 
+ protected:
+  virtual int ListSize(const ListType& list) const = 0;
+  virtual const ItemType GetItem(const ListType& list, int idx) const = 0;
+  virtual ItemType* AddItem(ListType& list) const = 0;
+
  private:
   std::vector<std::pair<int32, int32>> ranges_;
   int32 max_range_end_ = -1;
@@ -159,15 +163,40 @@ class SplitLandmarksCalculator : public CalculatorBase {
   bool combine_outputs_ = false;
 };
 
-typedef SplitLandmarksCalculator<NormalizedLandmark, NormalizedLandmarkList>
-    SplitNormalizedLandmarkListCalculator;
+// TODO: Move calculators to separate *.cc files
+
+class SplitNormalizedLandmarkListCalculator
+    : public SplitListsCalculator<NormalizedLandmark, NormalizedLandmarkList> {
+ protected:
+  int ListSize(const NormalizedLandmarkList& list) const override {
+    return list.landmark_size();
+  }
+  const NormalizedLandmark GetItem(const NormalizedLandmarkList& list,
+                                   int idx) const override {
+    return list.landmark(idx);
+  }
+  NormalizedLandmark* AddItem(NormalizedLandmarkList& list) const override {
+    return list.add_landmark();
+  }
+};
 REGISTER_CALCULATOR(SplitNormalizedLandmarkListCalculator);
 
-typedef SplitLandmarksCalculator<Landmark, LandmarkList>
-    SplitLandmarkListCalculator;
+class SplitLandmarkListCalculator
+    : public SplitListsCalculator<Landmark, LandmarkList> {
+ protected:
+  int ListSize(const LandmarkList& list) const override {
+    return list.landmark_size();
+  }
+  const Landmark GetItem(const LandmarkList& list, int idx) const override {
+    return list.landmark(idx);
+  }
+  Landmark* AddItem(LandmarkList& list) const override {
+    return list.add_landmark();
+  }
+};
 REGISTER_CALCULATOR(SplitLandmarkListCalculator);
 
 }  // namespace mediapipe
 
 // NOLINTNEXTLINE
-#endif  // MEDIAPIPE_CALCULATORS_CORE_SPLIT_LANDMARKS_CALCULATOR_H_
+#endif  // MEDIAPIPE_CALCULATORS_CORE_SPLIT_PROTO_LIST_CALCULATOR_H_

mediapipe/calculators/core/split_vector_calculator.cc

@@ -83,4 +83,7 @@ REGISTER_CALCULATOR(SplitClassificationListVectorCalculator);
 typedef SplitVectorCalculator<uint64_t, false> SplitUint64tVectorCalculator;
 REGISTER_CALCULATOR(SplitUint64tVectorCalculator);
 
+typedef SplitVectorCalculator<float, false> SplitFloatVectorCalculator;
+REGISTER_CALCULATOR(SplitFloatVectorCalculator);
+
 }  // namespace mediapipe

mediapipe/calculators/core/string_to_int_calculator.cc

@@ -24,7 +24,7 @@
 
 namespace mediapipe {
 
-// Calculator that converts a std::string into an integer type, or fails if the
+// Calculator that converts a string into an integer type, or fails if the
 // conversion is not possible.
 //
 // Example config:
@@ -47,7 +47,7 @@ class StringToIntCalculatorTemplate : public CalculatorBase {
     if (!absl::SimpleAtoi(cc->InputSidePackets().Index(0).Get<std::string>(),
                           &number)) {
       return absl::InvalidArgumentError(
-          "The std::string could not be parsed as an integer.");
+          "The string could not be parsed as an integer.");
     }
     cc->OutputSidePackets().Index(0).Set(MakePacket<IntType>(number));
     return absl::OkStatus();

mediapipe/calculators/core/vector_size_calculator.cc

@@ -0,0 +1,32 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/calculators/core/vector_size_calculator.h"
+
+#include "mediapipe/framework/formats/classification.pb.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+
+namespace mediapipe {
+namespace api2 {
+
+using LandmarkListVectorSizeCalculator =
+    VectorSizeCalculator<mediapipe::LandmarkList>;
+REGISTER_CALCULATOR(LandmarkListVectorSizeCalculator);
+
+using ClassificationListVectorSizeCalculator =
+    VectorSizeCalculator<mediapipe::ClassificationList>;
+REGISTER_CALCULATOR(ClassificationListVectorSizeCalculator);
+
+}  // namespace api2
+}  // namespace mediapipe

mediapipe/calculators/core/vector_size_calculator.h

@@ -0,0 +1,64 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_CORE_VECTOR_SIZE_CALCULATOR_H_
+#define MEDIAPIPE_CALCULATORS_CORE_VECTOR_SIZE_CALCULATOR_H_
+
+#include <optional>
+
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/port/status.h"
+
+namespace mediapipe {
+namespace api2 {
+
+// A calcutlator to return vector size.
+//
+// Inputs:
+//   VECTOR - std::vector<T>
+//     Vector which size to return.
+//
+// Outputs:
+//   SIZE - int
+//     Size of the input vector.
+//
+// Example config:
+//  node {
+//    calculator: "{SpecificType}VectorSizeCalculator"
+//    input_stream: "VECTOR:vector"
+//    output_stream: "SIZE:vector_size"
+//  }
+//
+template <typename T>
+class VectorSizeCalculator : public Node {
+ public:
+  static constexpr Input<std::vector<T>> kIn{"VECTOR"};
+  static constexpr Output<int> kOut{"SIZE"};
+
+  MEDIAPIPE_NODE_CONTRACT(kIn, kOut);
+
+  absl::Status Process(CalculatorContext* cc) final {
+    if (kIn(cc).IsEmpty()) {
+      return absl::OkStatus();
+    }
+    kOut(cc).Send(kIn(cc).Get().size());
+    return absl::OkStatus();
+  }
+};
+
+}  // namespace api2
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_CORE_VECTOR_SIZE_CALCULATOR_H_

mediapipe/calculators/image/BUILD

@@ -239,10 +239,13 @@ cc_library(
     visibility = ["//visibility:public"],
     deps = [
         ":image_transformation_calculator_cc_proto",
+        "//mediapipe/framework:packet",
+        "//mediapipe/framework:timestamp",
         "//mediapipe/gpu:scale_mode_cc_proto",
         "//mediapipe/framework:calculator_framework",
         "//mediapipe/framework/formats:image_frame",
         "//mediapipe/framework/formats:image_frame_opencv",
+        "//mediapipe/framework/formats:video_stream_header",
         "//mediapipe/framework/port:opencv_core",
         "//mediapipe/framework/port:opencv_imgproc",
         "//mediapipe/framework/port:ret_check",
@@ -623,11 +626,8 @@ cc_library(
         "//mediapipe/framework/formats:image_format_cc_proto",
         "//mediapipe/framework:calculator_framework",
         "//mediapipe/framework/formats:image_frame",
-        "//mediapipe/framework/formats:image_frame_opencv",
         "//mediapipe/framework/formats:image",
-        "//mediapipe/framework/formats:image_opencv",
         "//mediapipe/framework/port:logging",
-        "//mediapipe/framework/port:opencv_core",
         "//mediapipe/framework/port:status",
         "//mediapipe/framework/port:vector",
     ] + select({
@@ -638,6 +638,13 @@ cc_library(
             "//mediapipe/gpu:gl_quad_renderer",
             "//mediapipe/gpu:shader_util",
         ],
+    }) + select({
+        "//mediapipe/framework/port:disable_opencv": [],
+        "//conditions:default": [
+            "//mediapipe/framework/formats:image_frame_opencv",
+            "//mediapipe/framework/formats:image_opencv",
+            "//mediapipe/framework/port:opencv_core",
+        ],
     }),
     alwayslink = 1,
 )
@@ -724,7 +731,6 @@ cc_library(
     visibility = ["//visibility:public"],
     deps = [
         ":affine_transformation",
-        ":affine_transformation_runner_opencv",
         ":warp_affine_calculator_cc_proto",
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/status:statusor",
@@ -742,6 +748,9 @@ cc_library(
             "//mediapipe/gpu:gpu_buffer",
             ":affine_transformation_runner_gl",
         ],
+    }) + select({
+        "//mediapipe/framework/port:disable_opencv": [],
+        "//conditions:default": [":affine_transformation_runner_opencv"],
     }),
     alwayslink = 1,
 )
@@ -796,3 +805,21 @@ cc_test(
         "@com_google_absl//absl/strings",
     ],
 )
+
+cc_library(
+    name = "yuv_to_image_calculator",
+    srcs = ["yuv_to_image_calculator.cc"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/framework:calculator_context",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/formats:image",
+        "//mediapipe/framework/formats:image_frame",
+        "//mediapipe/framework/formats:yuv_image",
+        "//third_party/libyuv",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/strings:str_format",
+    ],
+    alwayslink = 1,
+)

mediapipe/calculators/image/image_file_properties_calculator.cc

@@ -105,7 +105,7 @@ absl::StatusOr<ImageFileProperties> GetImageFileProperites(
 }  // namespace
 
 // Calculator to extract EXIF information from an image file. The input is
-// a std::string containing raw byte data from a file, and the output is an
+// a string containing raw byte data from a file, and the output is an
 // ImageFileProperties proto object with the relevant fields filled in.
 // The calculator accepts the input as a stream or a side packet, and can output
 // the result as a stream or a side packet. The calculator checks that if an

mediapipe/calculators/image/image_transformation_calculator.cc

@@ -16,10 +16,13 @@
 #include "mediapipe/framework/calculator_framework.h"
 #include "mediapipe/framework/formats/image_frame.h"
 #include "mediapipe/framework/formats/image_frame_opencv.h"
+#include "mediapipe/framework/formats/video_stream_header.h"
+#include "mediapipe/framework/packet.h"
 #include "mediapipe/framework/port/opencv_core_inc.h"
 #include "mediapipe/framework/port/opencv_imgproc_inc.h"
 #include "mediapipe/framework/port/ret_check.h"
 #include "mediapipe/framework/port/status.h"
+#include "mediapipe/framework/timestamp.h"
 #include "mediapipe/gpu/scale_mode.pb.h"
 
 #if !MEDIAPIPE_DISABLE_GPU
@@ -52,6 +55,7 @@ namespace mediapipe {
 namespace {
 constexpr char kImageFrameTag[] = "IMAGE";
 constexpr char kGpuBufferTag[] = "IMAGE_GPU";
+constexpr char kVideoPrestreamTag[] = "VIDEO_PRESTREAM";
 
 int RotationModeToDegrees(mediapipe::RotationMode_Mode rotation) {
   switch (rotation) {
@@ -122,6 +126,12 @@ mediapipe::ScaleMode_Mode ParseScaleMode(
 //   provided, it overrides the FLIP_VERTICALLY input side packet and/or
 //   corresponding field in the calculator options.
 //
+//   VIDEO_PRESTREAM (optional): VideoHeader for the input ImageFrames, if
+//   rotating or scaling the frames, the header width and height will be updated
+//   appropriately. Note the header is updated only based on dimensions and
+//   rotations specified as side packets or options, input_stream
+//   transformations will not update the header.
+//
 // Output:
 //   One of the following tags:
 //   IMAGE - ImageFrame representing the output image.
@@ -242,6 +252,21 @@ absl::Status ImageTransformationCalculator::GetContract(
     cc->Inputs().Tag("FLIP_VERTICALLY").Set<bool>();
   }
 
+  RET_CHECK(cc->Inputs().HasTag(kVideoPrestreamTag) ==
+            cc->Outputs().HasTag(kVideoPrestreamTag))
+      << "If VIDEO_PRESTREAM is provided, it must be provided both as an "
+         "inputs and output stream.";
+  if (cc->Inputs().HasTag(kVideoPrestreamTag)) {
+    RET_CHECK(!(cc->Inputs().HasTag("OUTPUT_DIMENSIONS") ||
+                cc->Inputs().HasTag("ROTATION_DEGREES")))
+        << "If specifying VIDEO_PRESTREAM, the transformations that affect the "
+           "dimensions of the frames (OUTPUT_DIMENSIONS and ROTATION_DEGREES) "
+           "need to be constant for every frame, meaning they can only be "
+           "provided in the calculator options or side packets.";
+    cc->Inputs().Tag(kVideoPrestreamTag).Set<mediapipe::VideoHeader>();
+    cc->Outputs().Tag(kVideoPrestreamTag).Set<mediapipe::VideoHeader>();
+  }
+
   if (cc->InputSidePackets().HasTag("OUTPUT_DIMENSIONS")) {
     cc->InputSidePackets().Tag("OUTPUT_DIMENSIONS").Set<DimensionsPacketType>();
   }
@@ -326,6 +351,24 @@ absl::Status ImageTransformationCalculator::Open(CalculatorContext* cc) {
 }
 
 absl::Status ImageTransformationCalculator::Process(CalculatorContext* cc) {
+  // First update the video header if it is given, based on the rotation and
+  // dimensions specified as side packets or options. This will only be done
+  // once, so streaming transformation changes will not be reflected in
+  // the header.
+  if (cc->Inputs().HasTag(kVideoPrestreamTag) &&
+      !cc->Inputs().Tag(kVideoPrestreamTag).IsEmpty() &&
+      cc->Outputs().HasTag(kVideoPrestreamTag)) {
+    mediapipe::VideoHeader header =
+        cc->Inputs().Tag(kVideoPrestreamTag).Get<mediapipe::VideoHeader>();
+    // Update the header's width and height if needed.
+    ComputeOutputDimensions(header.width, header.height, &header.width,
+                            &header.height);
+    cc->Outputs()
+        .Tag(kVideoPrestreamTag)
+        .AddPacket(mediapipe::MakePacket<mediapipe::VideoHeader>(header).At(
+            mediapipe::Timestamp::PreStream()));
+  }
+
   // Override values if specified so.
   if (cc->Inputs().HasTag("ROTATION_DEGREES") &&
       !cc->Inputs().Tag("ROTATION_DEGREES").IsEmpty()) {

mediapipe/calculators/image/opencv_encoded_image_to_image_frame_calculator.cc

@@ -22,9 +22,9 @@
 
 namespace mediapipe {
 
-// Takes in an encoded image std::string, decodes it by OpenCV, and converts to
-// an ImageFrame. Note that this calculator only supports grayscale and RGB
-// images for now.
+// Takes in an encoded image string, decodes it by OpenCV, and converts to an
+// ImageFrame. Note that this calculator only supports grayscale and RGB images
+// for now.
 //
 // Example config:
 // node {

mediapipe/calculators/image/opencv_put_text_calculator.cc

@@ -20,8 +20,8 @@
 
 namespace mediapipe {
 
-// Takes in a std::string, draws the text std::string by cv::putText(), and
-// outputs an ImageFrame.
+// Takes in a string, draws the text string by cv::putText(), and outputs an
+// ImageFrame.
 //
 // Example config:
 // node {

mediapipe/calculators/image/scale_image_calculator.cc

@@ -421,6 +421,10 @@ absl::Status ScaleImageCalculator::InitializeFromOptions() {
     alignment_boundary_ = options_.alignment_boundary();
   }
 
+  if (options_.has_output_format()) {
+    output_format_ = options_.output_format();
+  }
+
   downscaler_.reset(new ImageResizer(options_.post_sharpening_coefficient()));
 
   return absl::OkStatus();
@@ -433,13 +437,17 @@ absl::Status ScaleImageCalculator::ValidateImageFormats() const {
       << "The output image format was set to UNKNOWN.";
   // TODO Remove these conditions.
   RET_CHECK(output_format_ == ImageFormat::SRGB ||
+            output_format_ == ImageFormat::SRGBA ||
             (input_format_ == output_format_ &&
              output_format_ == ImageFormat::YCBCR420P))
       << "Outputting YCbCr420P images from SRGB input is not yet supported";
   RET_CHECK(input_format_ == output_format_ ||
-            input_format_ == ImageFormat::YCBCR420P)
+            (input_format_ == ImageFormat::YCBCR420P &&
+             output_format_ == ImageFormat::SRGB) ||
+            (input_format_ == ImageFormat::SRGB &&
+             output_format_ == ImageFormat::SRGBA))
       << "Conversion of the color space (except from "
-         "YCbCr420P to SRGB) is not yet supported.";
+         "YCbCr420P to SRGB or SRGB to SRBGA) is not yet supported.";
   return absl::OkStatus();
 }
 
@@ -553,7 +561,6 @@ absl::Status ScaleImageCalculator::Process(CalculatorContext* cc) {
     }
   }
 
-  cc->GetCounter("Inputs")->Increment();
   const ImageFrame* image_frame;
   ImageFrame converted_image_frame;
   if (input_format_ == ImageFormat::YCBCR420P) {
@@ -605,6 +612,15 @@ absl::Status ScaleImageCalculator::Process(CalculatorContext* cc) {
           .Add(output_image.release(), cc->InputTimestamp());
       return absl::OkStatus();
     }
+  } else if (input_format_ == ImageFormat::SRGB &&
+             output_format_ == ImageFormat::SRGBA) {
+    image_frame = &cc->Inputs().Get(input_data_id_).Get<ImageFrame>();
+    cv::Mat input_mat = ::mediapipe::formats::MatView(image_frame);
+    converted_image_frame.Reset(ImageFormat::SRGBA, image_frame->Width(),
+                                image_frame->Height(), alignment_boundary_);
+    cv::Mat output_mat = ::mediapipe::formats::MatView(&converted_image_frame);
+    cv::cvtColor(input_mat, output_mat, cv::COLOR_RGB2RGBA, 4);
+    image_frame = &converted_image_frame;
   } else {
     image_frame = &cc->Inputs().Get(input_data_id_).Get<ImageFrame>();
     MP_RETURN_IF_ERROR(ValidateImageFrame(cc, *image_frame));

mediapipe/calculators/image/segmentation_smoothing_calculator.cc

@@ -21,10 +21,7 @@
 #include "mediapipe/framework/formats/image.h"
 #include "mediapipe/framework/formats/image_format.pb.h"
 #include "mediapipe/framework/formats/image_frame.h"
-#include "mediapipe/framework/formats/image_frame_opencv.h"
-#include "mediapipe/framework/formats/image_opencv.h"
 #include "mediapipe/framework/port/logging.h"
-#include "mediapipe/framework/port/opencv_core_inc.h"
 #include "mediapipe/framework/port/status.h"
 #include "mediapipe/framework/port/vector.h"
 
@@ -34,6 +31,12 @@
 #include "mediapipe/gpu/shader_util.h"
 #endif  // !MEDIAPIPE_DISABLE_GPU
 
+#if !MEDIAPIPE_DISABLE_OPENCV
+#include "mediapipe/framework/formats/image_frame_opencv.h"
+#include "mediapipe/framework/formats/image_opencv.h"
+#include "mediapipe/framework/port/opencv_core_inc.h"
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
+
 namespace mediapipe {
 
 namespace {
@@ -163,7 +166,11 @@ absl::Status SegmentationSmoothingCalculator::Process(CalculatorContext* cc) {
     return absl::InternalError("GPU processing is disabled.");
 #endif  // !MEDIAPIPE_DISABLE_GPU
   } else {
+#if !MEDIAPIPE_DISABLE_OPENCV
     MP_RETURN_IF_ERROR(RenderCpu(cc));
+#else
+    return absl::InternalError("OpenCV processing is disabled.");
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
   }
 
   return absl::OkStatus();
@@ -181,24 +188,25 @@ absl::Status SegmentationSmoothingCalculator::Close(CalculatorContext* cc) {
 }
 
 absl::Status SegmentationSmoothingCalculator::RenderCpu(CalculatorContext* cc) {
+#if !MEDIAPIPE_DISABLE_OPENCV
   // Setup source images.
   const auto& current_frame = cc->Inputs().Tag(kCurrentMaskTag).Get<Image>();
-  const cv::Mat current_mat = mediapipe::formats::MatView(&current_frame);
-  RET_CHECK_EQ(current_mat.type(), CV_32FC1)
+  auto current_mat = mediapipe::formats::MatView(&current_frame);
+  RET_CHECK_EQ(current_mat->type(), CV_32FC1)
       << "Only 1-channel float input image is supported.";
 
   const auto& previous_frame = cc->Inputs().Tag(kPreviousMaskTag).Get<Image>();
-  const cv::Mat previous_mat = mediapipe::formats::MatView(&previous_frame);
-  RET_CHECK_EQ(previous_mat.type(), current_mat.type())
-      << "Warning: mixing input format types: " << previous_mat.type()
-      << " != " << previous_mat.type();
+  auto previous_mat = mediapipe::formats::MatView(&previous_frame);
+  RET_CHECK_EQ(previous_mat->type(), current_mat->type())
+      << "Warning: mixing input format types: " << previous_mat->type()
+      << " != " << previous_mat->type();
 
-  RET_CHECK_EQ(current_mat.rows, previous_mat.rows);
-  RET_CHECK_EQ(current_mat.cols, previous_mat.cols);
+  RET_CHECK_EQ(current_mat->rows, previous_mat->rows);
+  RET_CHECK_EQ(current_mat->cols, previous_mat->cols);
 
   // Setup destination image.
   auto output_frame = std::make_shared<ImageFrame>(
-      current_frame.image_format(), current_mat.cols, current_mat.rows);
+      current_frame.image_format(), current_mat->cols, current_mat->rows);
   cv::Mat output_mat = mediapipe::formats::MatView(output_frame.get());
   output_mat.setTo(cv::Scalar(0));
 
@@ -233,8 +241,8 @@ absl::Status SegmentationSmoothingCalculator::RenderCpu(CalculatorContext* cc) {
   // Write directly to the first channel of output.
   for (int i = 0; i < output_mat.rows; ++i) {
     float* out_ptr = output_mat.ptr<float>(i);
-    const float* curr_ptr = current_mat.ptr<float>(i);
-    const float* prev_ptr = previous_mat.ptr<float>(i);
+    const float* curr_ptr = current_mat->ptr<float>(i);
+    const float* prev_ptr = previous_mat->ptr<float>(i);
     for (int j = 0; j < output_mat.cols; ++j) {
       const float new_mask_value = curr_ptr[j];
       const float prev_mask_value = prev_ptr[j];
@@ -245,6 +253,7 @@ absl::Status SegmentationSmoothingCalculator::RenderCpu(CalculatorContext* cc) {
   cc->Outputs()
       .Tag(kOutputMaskTag)
       .AddPacket(MakePacket<Image>(output_frame).At(cc->InputTimestamp()));
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 
   return absl::OkStatus();
 }

mediapipe/calculators/image/segmentation_smoothing_calculator_test.cc

@@ -116,8 +116,8 @@ void RunGraph(Packet curr_packet, Packet prev_packet, bool use_gpu, float ratio,
   ASSERT_EQ(1, output_packets.size());
 
   Image result_image = output_packets[0].Get<Image>();
-  cv::Mat result_mat = formats::MatView(&result_image);
-  result_mat.copyTo(*result);
+  auto result_mat = formats::MatView(&result_image);
+  result_mat->copyTo(*result);
 
   // Fully close graph at end, otherwise calculator+Images are destroyed
   // after calling WaitUntilDone().
@@ -135,10 +135,10 @@ void RunTest(bool use_gpu, float mix_ratio, cv::Mat& test_result) {
 
   Packet curr_packet = MakePacket<Image>(std::make_unique<ImageFrame>(
       ImageFormat::VEC32F1, curr_mat.size().width, curr_mat.size().height));
-  curr_mat.copyTo(formats::MatView(&(curr_packet.Get<Image>())));
+  curr_mat.copyTo(*formats::MatView(&(curr_packet.Get<Image>())));
   Packet prev_packet = MakePacket<Image>(std::make_unique<ImageFrame>(
       ImageFormat::VEC32F1, prev_mat.size().width, prev_mat.size().height));
-  prev_mat.copyTo(formats::MatView(&(prev_packet.Get<Image>())));
+  prev_mat.copyTo(*formats::MatView(&(prev_packet.Get<Image>())));
 
   cv::Mat result;
   RunGraph(curr_packet, prev_packet, use_gpu, mix_ratio, &result);

mediapipe/calculators/image/warp_affine_calculator.cc

@@ -24,7 +24,9 @@
 #endif  // !MEDIAPIPE_DISABLE_GPU
 #include "absl/status/status.h"
 #include "absl/status/statusor.h"
+#if !MEDIAPIPE_DISABLE_OPENCV
 #include "mediapipe/calculators/image/affine_transformation_runner_opencv.h"
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 #include "mediapipe/calculators/image/warp_affine_calculator.pb.h"
 #include "mediapipe/framework/api2/node.h"
 #include "mediapipe/framework/calculator_framework.h"
@@ -54,6 +56,7 @@ AffineTransformation::BorderMode GetBorderMode(
 template <typename ImageT>
 class WarpAffineRunnerHolder {};
 
+#if !MEDIAPIPE_DISABLE_OPENCV
 template <>
 class WarpAffineRunnerHolder<ImageFrame> {
  public:
@@ -69,6 +72,7 @@ class WarpAffineRunnerHolder<ImageFrame> {
  private:
   std::unique_ptr<RunnerType> runner_;
 };
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 
 #if !MEDIAPIPE_DISABLE_GPU
 template <>
@@ -113,7 +117,9 @@ class WarpAffineRunnerHolder<mediapipe::Image> {
                                                      mediapipe::Image> {
    public:
     absl::Status Open(CalculatorContext* cc) {
+#if !MEDIAPIPE_DISABLE_OPENCV
       MP_RETURN_IF_ERROR(cpu_holder_.Open(cc));
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 #if !MEDIAPIPE_DISABLE_GPU
       MP_RETURN_IF_ERROR(gpu_holder_.Open(cc));
 #endif  // !MEDIAPIPE_DISABLE_GPU
@@ -133,20 +139,26 @@ class WarpAffineRunnerHolder<mediapipe::Image> {
         return absl::UnavailableError("GPU support is disabled");
 #endif  // !MEDIAPIPE_DISABLE_GPU
       }
+#if !MEDIAPIPE_DISABLE_OPENCV
       ASSIGN_OR_RETURN(auto* runner, cpu_holder_.GetRunner());
       const auto& frame_ptr = input.GetImageFrameSharedPtr();
       // Wrap image into image frame.
       const ImageFrame image_frame(frame_ptr->Format(), frame_ptr->Width(),
                                    frame_ptr->Height(), frame_ptr->WidthStep(),
                                    const_cast<uint8_t*>(frame_ptr->PixelData()),
-                                   [](uint8* data) {});
+                                   [](uint8* data){});
       ASSIGN_OR_RETURN(auto result,
                        runner->Run(image_frame, matrix, size, border_mode));
       return mediapipe::Image(std::make_shared<ImageFrame>(std::move(result)));
+#else
+      return absl::UnavailableError("OpenCV support is disabled");
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
     }
 
    private:
+#if !MEDIAPIPE_DISABLE_OPENCV
     WarpAffineRunnerHolder<ImageFrame> cpu_holder_;
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 #if !MEDIAPIPE_DISABLE_GPU
     WarpAffineRunnerHolder<mediapipe::GpuBuffer> gpu_holder_;
 #endif  // !MEDIAPIPE_DISABLE_GPU
@@ -200,8 +212,10 @@ class WarpAffineCalculatorImpl : public mediapipe::api2::NodeImpl<InterfaceT> {
 
 }  // namespace
 
+#if !MEDIAPIPE_DISABLE_OPENCV
 MEDIAPIPE_NODE_IMPLEMENTATION(
     WarpAffineCalculatorImpl<WarpAffineCalculatorCpu>);
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 #if !MEDIAPIPE_DISABLE_GPU
 MEDIAPIPE_NODE_IMPLEMENTATION(
     WarpAffineCalculatorImpl<WarpAffineCalculatorGpu>);

mediapipe/calculators/image/warp_affine_calculator.h

@@ -70,11 +70,13 @@ class WarpAffineCalculatorIntf : public mediapipe::api2::NodeIntf {
   static constexpr mediapipe::api2::Output<ImageT> kOutImage{"IMAGE"};
 };
 
+#if !MEDIAPIPE_DISABLE_OPENCV
 class WarpAffineCalculatorCpu : public WarpAffineCalculatorIntf<ImageFrame> {
  public:
   MEDIAPIPE_NODE_INTERFACE(WarpAffineCalculatorCpu, kInImage, kMatrix,
                            kOutputSize, kOutImage);
 };
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 #if !MEDIAPIPE_DISABLE_GPU
 class WarpAffineCalculatorGpu
     : public WarpAffineCalculatorIntf<mediapipe::GpuBuffer> {

mediapipe/calculators/image/yuv_to_image_calculator.cc

@@ -0,0 +1,123 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "absl/status/status.h"
+#include "absl/strings/str_format.h"
+#include "libyuv/convert_argb.h"
+#include "libyuv/video_common.h"
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/calculator_context.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/formats/image_frame.h"
+#include "mediapipe/framework/formats/yuv_image.h"
+
+namespace mediapipe {
+namespace api2 {
+
+namespace {
+
+// Utility function to convert FourCC enum to string, for error messages.
+std::string FourCCToString(libyuv::FourCC fourcc) {
+  char buf[5];
+  buf[0] = (fourcc >> 24) & 0xff;
+  buf[1] = (fourcc >> 16) & 0xff;
+  buf[2] = (fourcc >> 8) & 0xff;
+  buf[3] = (fourcc)&0xff;
+  buf[4] = 0;
+  return std::string(buf);
+}
+}  // namespace
+
+// Converts a `YUVImage` into an RGB `Image` using libyuv.
+//
+// The input `YUVImage` is expected to be in the NV12, NV21, YV12 or I420 (aka
+// YV21) format (as per the `fourcc()` property). This covers the most commonly
+// used YUV image formats used on mobile devices. Other formats are not
+// supported and wil result in an `InvalidArgumentError`.
+class YUVToImageCalculator : public Node {
+ public:
+  static constexpr Input<YUVImage> kInput{"YUV_IMAGE"};
+  static constexpr Output<Image> kOutput{"IMAGE"};
+
+  MEDIAPIPE_NODE_CONTRACT(kInput, kOutput);
+
+  absl::Status Process(CalculatorContext* cc) override {
+    const auto& yuv_image = *kInput(cc);
+    // Check that the format is supported.
+    auto format = yuv_image.fourcc();
+    if (format != libyuv::FOURCC_NV12 && format != libyuv::FOURCC_NV21 &&
+        format != libyuv::FOURCC_YV12 && format != libyuv::FOURCC_I420) {
+      return absl::InvalidArgumentError(
+          absl::StrFormat("Unsupported YUVImage format: %s. Only NV12, NV21, "
+                          "YV12 and I420 (aka YV21) are supported.",
+                          FourCCToString(format)));
+    }
+    // Build a transient ImageFrameSharedPtr with default alignment to host
+    // conversion results.
+    ImageFrameSharedPtr image_frame = std::make_shared<ImageFrame>(
+        ImageFormat::SRGB, yuv_image.width(), yuv_image.height());
+    // Perform actual conversion.
+    switch (format) {
+      case libyuv::FOURCC_NV12:
+        // 8-bit Y plane followed by an interleaved 8-bit U/V plane with 2×2
+        // subsampling.
+        libyuv::NV12ToRAW(
+            yuv_image.data(0), yuv_image.stride(0), yuv_image.data(1),
+            yuv_image.stride(1), image_frame->MutablePixelData(),
+            image_frame->WidthStep(), yuv_image.width(), yuv_image.height());
+        break;
+      case libyuv::FOURCC_NV21:
+        // 8-bit Y plane followed by an interleaved 8-bit V/U plane with 2×2
+        // subsampling.
+        libyuv::NV21ToRAW(
+            yuv_image.data(0), yuv_image.stride(0), yuv_image.data(1),
+            yuv_image.stride(1), image_frame->MutablePixelData(),
+            image_frame->WidthStep(), yuv_image.width(), yuv_image.height());
+        break;
+      case libyuv::FOURCC_I420:
+        // Also known as YV21.
+        // 8-bit Y plane followed by 8-bit 2×2 subsampled U and V planes.
+        libyuv::I420ToRAW(
+            yuv_image.data(0), yuv_image.stride(0), yuv_image.data(1),
+            yuv_image.stride(1), yuv_image.data(2), yuv_image.stride(2),
+            image_frame->MutablePixelData(), image_frame->WidthStep(),
+            yuv_image.width(), yuv_image.height());
+        break;
+      case libyuv::FOURCC_YV12:
+        // 8-bit Y plane followed by 8-bit 2×2 subsampled V and U planes.
+        libyuv::I420ToRAW(
+            yuv_image.data(0), yuv_image.stride(0), yuv_image.data(2),
+            yuv_image.stride(2), yuv_image.data(1), yuv_image.stride(1),
+            image_frame->MutablePixelData(), image_frame->WidthStep(),
+            yuv_image.width(), yuv_image.height());
+        break;
+      default:
+        // This should never happen (caught by checks above).
+        return absl::InternalError("Unsupported YUVImage format.");
+    }
+    // Finally, build and send an Image object that takes ownership of the
+    // transient ImageFrameSharedPtr object.
+    kOutput(cc).Send(std::make_unique<Image>(std::move(image_frame)));
+    return absl::OkStatus();
+  }
+};
+MEDIAPIPE_REGISTER_NODE(YUVToImageCalculator);
+
+}  // namespace api2
+}  // namespace mediapipe

mediapipe/calculators/tensor/BUILD

@@ -28,7 +28,9 @@ package(default_visibility = ["//visibility:private"])
 
 exports_files(
     glob(["testdata/image_to_tensor/*"]),
-    visibility = ["//mediapipe/calculators/image:__subpackages__"],
+    visibility = [
+        "//mediapipe/calculators/image:__subpackages__",
+    ],
 )
 
 selects.config_setting_group(
@@ -38,6 +40,63 @@ selects.config_setting_group(
     ],
 )
 
+mediapipe_proto_library(
+    name = "audio_to_tensor_calculator_proto",
+    srcs = ["audio_to_tensor_calculator.proto"],
+    visibility = [
+        "//mediapipe/framework:mediapipe_internal",
+    ],
+    deps = [
+        "//mediapipe/framework:calculator_options_proto",
+        "//mediapipe/framework:calculator_proto",
+    ],
+)
+
+cc_library(
+    name = "audio_to_tensor_calculator",
+    srcs = ["audio_to_tensor_calculator.cc"],
+    visibility = [
+        "//mediapipe/framework:mediapipe_internal",
+    ],
+    deps = [
+        ":audio_to_tensor_calculator_cc_proto",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/api2:packet",
+        "//mediapipe/framework/api2:port",
+        "//mediapipe/framework/formats:matrix",
+        "//mediapipe/framework/formats:tensor",
+        "//mediapipe/framework/formats:time_series_header_cc_proto",
+        "//mediapipe/util:time_series_util",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "@com_google_absl//absl/strings:str_format",
+        "@com_google_audio_tools//audio/dsp:resampler_q",
+        "@org_tensorflow//tensorflow/lite/c:common",
+    ],
+    alwayslink = 1,
+)
+
+cc_test(
+    name = "audio_to_tensor_calculator_test",
+    srcs = ["audio_to_tensor_calculator_test.cc"],
+    deps = [
+        ":audio_to_tensor_calculator",
+        "//mediapipe/framework:calculator_cc_proto",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework:timestamp",
+        "//mediapipe/framework/api2:packet",
+        "//mediapipe/framework/formats:matrix",
+        "//mediapipe/framework/formats:tensor",
+        "//mediapipe/framework/port:gtest_main",
+        "//mediapipe/framework/port:parse_text_proto",
+        "@com_google_absl//absl/strings",
+        "@com_google_audio_tools//audio/dsp:resampler_q",
+        "@org_tensorflow//tensorflow/lite/c:common",
+    ],
+)
+
 mediapipe_proto_library(
     name = "inference_calculator_proto",
     srcs = ["inference_calculator.proto"],
@@ -48,6 +107,14 @@ mediapipe_proto_library(
     ],
 )
 
+# This target defines the "InferenceCalculator" component, which looks for the available concrete
+# implementations linked into the current binary and picks the one to use.
+# You can depend on :inference_calculator instead if you want to automatically include a default
+# set of implementations tailored for the current build configuration.
+# If you want to have precise control of which implementations to include (e.g. for strict binary
+# size concerns), depend on those implementations directly, and do not depend on
+# :inference_calculator.
+# In all cases, use "InferenceCalulator" in your graphs.
 cc_library(
     name = "inference_calculator_interface",
     srcs = ["inference_calculator.cc"],
@@ -60,19 +127,21 @@ cc_library(
         ],
         "//conditions:default": [],
     }),
+    visibility = ["//visibility:public"],
     deps = [
-        ":inference_calculator_cc_proto",
+        ":inference_calculator_options_lib",
         "//mediapipe/framework:calculator_framework",
         "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/api2:packet",
         "//mediapipe/framework/formats:tensor",
         "//mediapipe/framework/port:ret_check",
         "//mediapipe/framework/stream_handler:fixed_size_input_stream_handler",
         "//mediapipe/framework/tool:subgraph_expansion",
-        "//mediapipe/util/tflite:config",
         "//mediapipe/util/tflite:tflite_model_loader",
         "@com_google_absl//absl/memory",
         "@com_google_absl//absl/strings",
         "@org_tensorflow//tensorflow/lite:framework",
+        "@org_tensorflow//tensorflow/lite/core/api:op_resolver",
         "@org_tensorflow//tensorflow/lite/kernels:builtin_ops",
     ],
     alwayslink = 1,
@@ -82,16 +151,31 @@ cc_library(
     name = "inference_calculator_gl",
     srcs = ["inference_calculator_gl.cc"],
     tags = ["nomac"],  # config problem with cpuinfo via TF
+    visibility = ["//visibility:public"],
     deps = [
-        "inference_calculator_interface",
+        ":inference_calculator_interface",
         "//mediapipe/gpu:gl_calculator_helper",
-        "//mediapipe/gpu:gpu_buffer",
-        "//mediapipe/util/tflite:tflite_gpu_runner",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/status",
+        "@org_tensorflow//tensorflow/lite:framework_stable",
         "@org_tensorflow//tensorflow/lite/delegates/gpu:gl_delegate",
-        "@org_tensorflow//tensorflow/lite/delegates/gpu/common:shape",
-        "@org_tensorflow//tensorflow/lite/delegates/gpu/gl:gl_buffer",
-        "@org_tensorflow//tensorflow/lite/delegates/gpu/gl:gl_program",
-        "@org_tensorflow//tensorflow/lite/delegates/gpu/gl:gl_shader",
+    ],
+    alwayslink = 1,
+)
+
+cc_library(
+    name = "inference_calculator_gl_advanced",
+    srcs = ["inference_calculator_gl_advanced.cc"],
+    tags = ["nomac"],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":inference_calculator_interface",
+        "//mediapipe/framework/deps:file_path",
+        "//mediapipe/gpu:gl_calculator_helper",
+        "//mediapipe/util/tflite:tflite_gpu_runner",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/status",
+        "@org_tensorflow//tensorflow/lite:framework_stable",
     ],
     alwayslink = 1,
 )
@@ -108,6 +192,7 @@ cc_library(
         "-framework MetalKit",
     ],
     tags = ["ios"],
+    visibility = ["//visibility:public"],
     deps = [
         "inference_calculator_interface",
         "//mediapipe/gpu:MPPMetalHelper",
@@ -137,10 +222,13 @@ cc_library(
         ],
         "//conditions:default": [],
     }),
+    visibility = ["//visibility:public"],
     deps = [
         ":inference_calculator_interface",
         "@com_google_absl//absl/memory",
         "@org_tensorflow//tensorflow/lite/delegates/xnnpack:xnnpack_delegate",
+        "@org_tensorflow//tensorflow/lite:framework_stable",
+        "@org_tensorflow//tensorflow/lite/c:c_api_types",
     ] + select({
         "//conditions:default": [
             "//mediapipe/util:cpu_util",
@@ -154,9 +242,13 @@ cc_library(
 
 cc_library(
     name = "inference_calculator_gl_if_compute_shader_available",
-    deps = select({
+    visibility = ["//visibility:public"],
+    deps = selects.with_or({
         ":compute_shader_unavailable": [],
-        "//conditions:default": [":inference_calculator_gl"],
+        "//conditions:default": [
+            ":inference_calculator_gl",
+            ":inference_calculator_gl_advanced",
+        ],
     }),
 )
 
@@ -303,7 +395,7 @@ cc_library(
         "//mediapipe/framework/formats:tensor",
         "//mediapipe/framework/formats/object_detection:anchor_cc_proto",
         "//mediapipe/framework/port:ret_check",
-    ] + select({
+    ] + selects.with_or({
         ":compute_shader_unavailable": [],
         "//conditions:default": [":tensors_to_detections_calculator_gpu_deps"],
     }),
@@ -477,6 +569,7 @@ cc_library(
         "//mediapipe/framework/formats:location",
         "//mediapipe/framework/port:ret_check",
         "//mediapipe/framework/formats:tensor",
+        "//mediapipe/util:label_map_cc_proto",
         "//mediapipe/util:resource_util",
     ] + select({
         "//mediapipe:android": [
@@ -499,6 +592,7 @@ mediapipe_proto_library(
     deps = [
         "//mediapipe/framework:calculator_options_proto",
         "//mediapipe/framework:calculator_proto",
+        "//mediapipe/util:label_map_proto",
     ],
 )
 
@@ -560,7 +654,7 @@ cc_library(
 
 cc_library(
     name = "image_to_tensor_calculator_gpu_deps",
-    deps = select({
+    deps = selects.with_or({
         "//mediapipe:android": [
             ":image_to_tensor_converter_gl_buffer",
             "//mediapipe/gpu:gl_calculator_helper",
@@ -665,6 +759,7 @@ cc_library(
         ],
         "//conditions:default": [],
     }),
+    visibility = ["//visibility:public"],
     deps = [
         ":image_to_tensor_converter",
         ":image_to_tensor_utils",
@@ -684,7 +779,7 @@ cc_library(
     name = "image_to_tensor_converter_gl_buffer",
     srcs = ["image_to_tensor_converter_gl_buffer.cc"],
     hdrs = ["image_to_tensor_converter_gl_buffer.h"],
-    deps = ["//mediapipe/framework:port"] + select({
+    deps = ["//mediapipe/framework:port"] + selects.with_or({
         "//mediapipe:apple": [],
         "//conditions:default": [
             ":image_to_tensor_converter",
@@ -851,9 +946,7 @@ cc_library(
         "@com_google_absl//absl/types:span",
         "//mediapipe/framework/formats:image",
         "//mediapipe/framework/formats:image_frame",
-        "//mediapipe/framework/formats:image_opencv",
         "//mediapipe/framework/formats:tensor",
-        "//mediapipe/framework/port:opencv_imgproc",
         "//mediapipe/framework/port:ret_check",
         "//mediapipe/framework:calculator_context",
         "//mediapipe/framework:calculator_framework",
@@ -883,6 +976,12 @@ cc_library(
             "@org_tensorflow//tensorflow/lite/delegates/gpu/gl:gl_texture",
             "@org_tensorflow//tensorflow/lite/delegates/gpu/gl/converters:util",
         ],
+    }) + select({
+        "//mediapipe/framework/port:disable_opencv": [],
+        "//conditions:default": [
+            "//mediapipe/framework/formats:image_opencv",
+            "//mediapipe/framework/port:opencv_imgproc",
+        ],
     }),
     alwayslink = 1,
 )

mediapipe/calculators/tensor/audio_to_tensor_calculator.cc

@@ -0,0 +1,401 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <math.h>
+
+#include <algorithm>
+#include <cstring>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/memory/memory.h"
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "absl/strings/str_format.h"
+#include "audio/dsp/resampler_q.h"
+#include "mediapipe/calculators/tensor/audio_to_tensor_calculator.pb.h"
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/api2/packet.h"
+#include "mediapipe/framework/api2/port.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/formats/matrix.h"
+#include "mediapipe/framework/formats/tensor.h"
+#include "mediapipe/framework/formats/time_series_header.pb.h"
+#include "mediapipe/util/time_series_util.h"
+
+namespace mediapipe {
+namespace api2 {
+
+// Converts audio buffers into tensors, possibly with resampling, buffering
+// and framing, according to specified inputs and options. All input audio
+// buffers will be first resampled from the input sample rate to the target
+// sample rate if they are not equal. The resampled audio data (with the
+// buffered samples from the previous runs in the streaming mode) will be broken
+// into fixed-sized, possibly overlapping frames. Finally, all frames will be
+// converted to and outputted as MediaPipe Tensors. The last output tensor will
+// be zero-padding if the remaining samples are insufficient.
+//
+// This calculator assumes that the input timestamps refer to the first
+// sample in each Matrix. The output timestamps follow this same convention.
+// One Process() call may output multiple tensors packets. The timestamps of
+// the output packets are determined by the timestamp of the previous output
+// packet, the target sample rate, and the number of samples advanced after the
+// previous output.
+//
+// The calculator has two running modes:
+//   Streaming mode: when "streaming_mode" is set to true in the calculator
+//     options, the calculator treats the input audio stream as a continuous
+//     stream. Thus, any samples that are not consumed in the previous runs will
+//     be cached in a global sample buffer. The audio data resampled from the
+//     current raw audio input will be appended to the global sample buffer.
+//     The calculator will process the global sample buffer and output as many
+//     tensors as possible.
+//   Non-streaming mode: when "streaming_mode" is set to false in the calculator
+//     options, the calculators treats the packets in the input audio stream as
+//     a batch of unrelated audio buffers. In each Process() call, the input
+//     buffer will be frist resampled, and framed as fixed-sized, possibly
+//     overlapping tensors. The last tensor produced by a Process() invocation
+//     will be zero-padding if the remaining samples are insufficient. As the
+//     calculator treats the input packets as unrelated, all samples will be
+//     processed immediately and no samples will be cached in the global sample
+//     buffer.
+//
+// Inputs:
+//   AUDIO - mediapipe::Matrix
+//     The audio data represented as mediapipe::Matrix.
+//   SAMPLE_RATE - double @Optional
+//     The sample rate of the corresponding audio data in the "AUDIO" stream.
+//     If a sample rate packet is provided at Timestamp::PreStream(), the sample
+//     rate will be used as the sample rate of every audio packets in the
+//     "AUDIO" stream. Note that one and only one of the "AUDIO" stream's time
+//     series header or the "SAMPLE_RATE" stream can exist.
+//
+// Outputs:
+//   TENSORS - std::vector<Tensor>
+//     Vector containing a single Tensor that represents a fix-sized audio
+//     frame.
+//   TIMESTAMPS - std::vector<Timestamp> @Optional
+//     Vector containing the output timestamps emitted by the current Process()
+//     invocation. In the non-streaming mode, the vector contains all of the
+//     output timestamps for an input audio buffer.
+//
+// Example:
+// node {
+//   calculator: "AudioToTensorCalculator"
+//   input_stream: "AUDIO:audio"
+//   output_stream: "TENSORS:tensors"
+//   output_stream: "TIMESTAMPS:timestamps"
+//   options {
+//     [mediapipe.AudioToTensorCalculatorOptions.ext] {
+//       num_channels: 2
+//       num_samples: 512
+//       num_overlapping_samples: 64
+//       target_sample_rate: 16000
+//       streaming_mode: true # or false
+//     }
+//   }
+// }
+class AudioToTensorCalculator : public Node {
+ public:
+  static constexpr Input<Matrix> kAudioIn{"AUDIO"};
+  // TODO: Removes this optional input stream when the "AUDIO" stream
+  // uses the new mediapipe audio data containers that carry audio metatdata,
+  // such as sample rate.
+  static constexpr Input<double>::Optional kAudioSampleRateIn{"SAMPLE_RATE"};
+  static constexpr Output<std::vector<Tensor>> kTensorsOut{"TENSORS"};
+  // A vector of the output timestamps emitted by the current Process()
+  // invocation. The packet timestamp is the last emitted timestamp.
+  static constexpr Output<std::vector<Timestamp>>::Optional kTimestampsOut{
+      "TIMESTAMPS"};
+  MEDIAPIPE_NODE_CONTRACT(kAudioIn, kAudioSampleRateIn, kTensorsOut,
+                          kTimestampsOut);
+
+  static absl::Status UpdateContract(CalculatorContract* cc);
+  absl::Status Open(CalculatorContext* cc);
+  absl::Status Process(CalculatorContext* cc);
+  absl::Status Close(CalculatorContext* cc);
+
+ private:
+  // The target number of channels.
+  int num_channels_;
+  // The target number of samples per channel.
+  int num_samples_;
+  // The number of samples per channel to advance after the current frame is
+  // processed.
+  int frame_step_;
+  bool streaming_mode_;
+  bool check_inconsistent_timestamps_;
+  Timestamp initial_timestamp_ = Timestamp::Unstarted();
+  int64 cumulative_input_samples_ = 0;
+  Timestamp next_output_timestamp_ = Timestamp::Unstarted();
+
+  double source_sample_rate_ = -1;
+  double target_sample_rate_ = -1;
+  // TODO: Configures QResamplerParams through calculator options.
+  audio_dsp::QResamplerParams params_;
+  // A QResampler instance to resample an audio stream.
+  std::unique_ptr<audio_dsp::QResampler<float>> resampler_;
+  Matrix sample_buffer_;
+  int processed_buffer_cols_ = 0;
+
+  absl::Status ProcessStreamingData(CalculatorContext* cc);
+  absl::Status ProcessNonStreamingData(CalculatorContext* cc);
+
+  absl::Status SetupStreamingResampler(double input_sample_rate_);
+  void AppendToSampleBuffer(Matrix buffer_to_append);
+
+  absl::StatusOr<std::vector<Tensor>> ConvertToTensor(
+      const Matrix& frame_to_convert);
+  absl::Status OutputTensors(const Matrix& buffer, bool should_flush,
+                             CalculatorContext* cc);
+};
+
+absl::Status AudioToTensorCalculator::UpdateContract(CalculatorContract* cc) {
+  const auto& options =
+      cc->Options<mediapipe::AudioToTensorCalculatorOptions>();
+  if (!options.has_num_channels() || !options.has_num_samples() ||
+      !options.has_target_sample_rate()) {
+    return absl::InvalidArgumentError(
+        "AudioToTensorCalculatorOptions must specifiy "
+        "`num_channels`, `num_samples`, and `target_sample_rate`.");
+  }
+  if (options.streaming_mode()) {
+    // Explicitly disables tiemstamp offset to disallow the timestamp bound
+    // from the input streams to be propagated to the output streams.
+    // In the streaming mode, the output timestamp bound is based on
+    // next_output_timestamp_, which can be smaller than the current input
+    // timestamps.
+    cc->SetTimestampOffset(TimestampDiff::Unset());
+  }
+  return absl::OkStatus();
+}
+
+absl::Status AudioToTensorCalculator::Open(CalculatorContext* cc) {
+  const auto& options =
+      cc->Options<mediapipe::AudioToTensorCalculatorOptions>();
+  num_channels_ = options.num_channels();
+  num_samples_ = options.num_samples();
+  if (options.has_num_overlapping_samples()) {
+    RET_CHECK_GE(options.num_overlapping_samples(), 0);
+    RET_CHECK_LT(options.num_overlapping_samples(), num_samples_);
+    frame_step_ = num_samples_ - options.num_overlapping_samples();
+  } else {
+    frame_step_ = num_samples_;
+  }
+  target_sample_rate_ = options.target_sample_rate();
+  streaming_mode_ = options.streaming_mode();
+  if (streaming_mode_) {
+    check_inconsistent_timestamps_ = options.check_inconsistent_timestamps();
+    sample_buffer_.resize(num_channels_, Eigen::NoChange);
+  }
+
+  RET_CHECK(kAudioSampleRateIn(cc).IsConnected() ^
+            !kAudioIn(cc).Header().IsEmpty())
+      << "Must either specify the time series header of the \"AUDIO\" stream "
+         "or have the \"SAMPLE_RATE\" stream connected.";
+  if (!kAudioIn(cc).Header().IsEmpty()) {
+    mediapipe::TimeSeriesHeader input_header;
+    MP_RETURN_IF_ERROR(mediapipe::time_series_util::FillTimeSeriesHeaderIfValid(
+        kAudioIn(cc).Header(), &input_header));
+    if (streaming_mode_) {
+      MP_RETURN_IF_ERROR(SetupStreamingResampler(input_header.sample_rate()));
+    } else {
+      source_sample_rate_ = input_header.sample_rate();
+    }
+  }
+  return absl::OkStatus();
+}
+
+absl::Status AudioToTensorCalculator::Process(CalculatorContext* cc) {
+  if (cc->InputTimestamp() == Timestamp::PreStream()) {
+    double current_source_sample_rate = kAudioSampleRateIn(cc).Get();
+    if (cc->Options<mediapipe::AudioToTensorCalculatorOptions>()
+            .streaming_mode()) {
+      return SetupStreamingResampler(current_source_sample_rate);
+    } else {
+      source_sample_rate_ = current_source_sample_rate;
+      return absl::OkStatus();
+    }
+  }
+  // Sanity checks.
+  const auto& input_frame = kAudioIn(cc).Get();
+  if (input_frame.rows() != num_channels_) {
+    return absl::InvalidArgumentError(absl::StrFormat(
+        "Audio input has %d channel(s) but the model requires %d channel(s).",
+        input_frame.rows(), num_channels_));
+  }
+  if (num_channels_ > 1 && input_frame.IsRowMajor) {
+    return absl::InvalidArgumentError(
+        "The audio data should be stored in column-major.");
+  }
+  return streaming_mode_ ? ProcessStreamingData(cc)
+                         : ProcessNonStreamingData(cc);
+}
+
+absl::Status AudioToTensorCalculator::Close(CalculatorContext* cc) {
+  if (!streaming_mode_) {
+    return absl::OkStatus();
+  }
+  if (resampler_) {
+    Matrix resampled_buffer(num_channels_, 0);
+    resampler_->Flush(&resampled_buffer);
+    AppendToSampleBuffer(std::move(resampled_buffer));
+  }
+  return OutputTensors(sample_buffer_, /*should_flush=*/true, cc);
+}
+
+absl::Status AudioToTensorCalculator::ProcessStreamingData(
+    CalculatorContext* cc) {
+  const auto& input_buffer = kAudioIn(cc).Get();
+  if (initial_timestamp_ == Timestamp::Unstarted()) {
+    initial_timestamp_ = cc->InputTimestamp();
+    next_output_timestamp_ = initial_timestamp_;
+  }
+  if (source_sample_rate_ != -1 && check_inconsistent_timestamps_) {
+    mediapipe::time_series_util::LogWarningIfTimestampIsInconsistent(
+        cc->InputTimestamp(), initial_timestamp_, cumulative_input_samples_,
+        source_sample_rate_);
+    cumulative_input_samples_ += input_buffer.cols();
+  }
+  if (!kAudioSampleRateIn(cc).IsEmpty()) {
+    double current_source_sample_rate = kAudioSampleRateIn(cc).Get();
+    if (resampler_) {
+      RET_CHECK_EQ(current_source_sample_rate, source_sample_rate_);
+    } else {
+      MP_RETURN_IF_ERROR(SetupStreamingResampler(current_source_sample_rate));
+    }
+  }
+
+  if (resampler_) {
+    Matrix resampled_buffer(num_channels_, 0);
+    resampler_->ProcessSamples(input_buffer, &resampled_buffer);
+    AppendToSampleBuffer(std::move(resampled_buffer));
+  } else {
+    // Tries to consume the input matrix first to avoid extra data copy.
+    auto status_or_matrix = kAudioIn(cc).packet().Consume<Matrix>();
+    if (status_or_matrix.ok()) {
+      Matrix local_matrix(num_channels_, 0);
+      local_matrix.swap(*status_or_matrix.value());
+      AppendToSampleBuffer(std::move(local_matrix));
+    } else {
+      AppendToSampleBuffer(input_buffer);
+    }
+  }
+
+  MP_RETURN_IF_ERROR(OutputTensors(sample_buffer_, /*should_flush=*/false, cc));
+  // Removes the processed samples from the global sample buffer.
+  sample_buffer_ = Matrix(sample_buffer_.rightCols(sample_buffer_.cols() -
+                                                   processed_buffer_cols_ - 1));
+  return absl::OkStatus();
+}
+
+absl::Status AudioToTensorCalculator::ProcessNonStreamingData(
+    CalculatorContext* cc) {
+  initial_timestamp_ = cc->InputTimestamp();
+  next_output_timestamp_ = initial_timestamp_;
+  const auto& input_frame = kAudioIn(cc).Get();
+  double source_sample_rate = kAudioSampleRateIn(cc).GetOr(source_sample_rate_);
+
+  if (source_sample_rate != -1 && source_sample_rate != target_sample_rate_) {
+    std::vector<float> resampled = audio_dsp::QResampleSignal<float>(
+        source_sample_rate, target_sample_rate_, num_channels_, params_,
+        input_frame);
+    Eigen::Map<const Matrix> matrix_mapping(resampled.data(), num_channels_,
+                                            resampled.size() / num_channels_);
+    return OutputTensors(matrix_mapping, /*should_flush=*/true, cc);
+  }
+  return OutputTensors(input_frame, /*should_flush=*/true, cc);
+}
+
+absl::Status AudioToTensorCalculator::SetupStreamingResampler(
+    double input_sample_rate) {
+  if (input_sample_rate == source_sample_rate_) {
+    return absl::OkStatus();
+  }
+  source_sample_rate_ = input_sample_rate;
+  if (source_sample_rate_ != target_sample_rate_) {
+    resampler_ = absl::make_unique<audio_dsp::QResampler<float>>(
+        source_sample_rate_, target_sample_rate_, num_channels_, params_);
+    if (!resampler_) {
+      return absl::InternalError("Failed to initialize resampler.");
+    }
+  }
+  return absl::OkStatus();
+}
+
+void AudioToTensorCalculator::AppendToSampleBuffer(Matrix buffer_to_append) {
+  sample_buffer_.conservativeResize(
+      Eigen::NoChange, sample_buffer_.cols() + buffer_to_append.cols());
+  sample_buffer_.rightCols(buffer_to_append.cols()).swap(buffer_to_append);
+}
+
+absl::StatusOr<std::vector<Tensor>> AudioToTensorCalculator::ConvertToTensor(
+    const Matrix& frame_to_convert) {
+  Tensor tensor(Tensor::ElementType::kFloat32,
+                Tensor::Shape({num_channels_, num_samples_}));
+  auto buffer_view = tensor.GetCpuWriteView();
+  if (frame_to_convert.size() < num_channels_ * num_samples_) {
+    std::memset(buffer_view.buffer<float>(), 0, tensor.bytes());
+  }
+  std::memcpy(buffer_view.buffer<float>(), frame_to_convert.data(),
+              frame_to_convert.size() * sizeof(float));
+  std::vector<Tensor> tensor_vector;
+  tensor_vector.push_back(std::move(tensor));
+  return tensor_vector;
+}
+
+absl::Status AudioToTensorCalculator::OutputTensors(const Matrix& buffer,
+                                                    bool should_flush,
+                                                    CalculatorContext* cc) {
+  int next_frame_first_col = 0;
+  std::vector<Timestamp> timestamps;
+  while ((!streaming_mode_ || !should_flush) &&
+         next_frame_first_col + num_samples_ <= buffer.cols()) {
+    ASSIGN_OR_RETURN(auto output_tensor, ConvertToTensor(buffer.block(
+                                             0, next_frame_first_col,
+                                             num_channels_, num_samples_)));
+    kTensorsOut(cc).Send(std::move(output_tensor), next_output_timestamp_);
+    timestamps.push_back(next_output_timestamp_);
+    next_output_timestamp_ += round(frame_step_ / target_sample_rate_ *
+                                    Timestamp::kTimestampUnitsPerSecond);
+    next_frame_first_col += frame_step_;
+  }
+  if (should_flush && next_frame_first_col < buffer.cols()) {
+    ASSIGN_OR_RETURN(auto output_tensor,
+                     ConvertToTensor(buffer.block(
+                         0, next_frame_first_col, num_channels_,
+                         std::min(num_samples_,
+                                  (int)buffer.cols() - next_frame_first_col))));
+    // In the streaming mode, the flush happens in Close() and a packet at
+    // Timestamp::Max() will be emitted. In the non-streaming mode, each
+    // Process() invocation will process the entire buffer completely.
+    Timestamp timestamp =
+        streaming_mode_ ? Timestamp::Max() : next_output_timestamp_;
+    timestamps.push_back(timestamp);
+    kTensorsOut(cc).Send(std::move(output_tensor), timestamp);
+  }
+  if (kTimestampsOut(cc).IsConnected()) {
+    Timestamp timestamp = timestamps.back();
+    kTimestampsOut(cc).Send(std::move(timestamps), timestamp);
+  }
+  processed_buffer_cols_ = next_frame_first_col - 1;
+  return absl::OkStatus();
+}
+
+MEDIAPIPE_REGISTER_NODE(AudioToTensorCalculator);
+
+}  // namespace api2
+}  // namespace mediapipe

mediapipe/calculators/tensor/audio_to_tensor_calculator.proto

@@ -0,0 +1,46 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+
+package mediapipe;
+
+import "mediapipe/framework/calculator.proto";
+
+message AudioToTensorCalculatorOptions {
+  extend mediapipe.CalculatorOptions {
+    optional AudioToTensorCalculatorOptions ext = 448635064;
+  }
+
+  // The required number of channels the output audio tensor has.
+  optional int64 num_channels = 1;
+
+  // The required number of samples per channel the output audio tensor has.
+  optional int64 num_samples = 2;
+
+  // The number of overlapping samples per channel the output audio tensor has.
+  optional int64 num_overlapping_samples = 3 [default = 0];
+
+  // The target number of samples per second (hertz) of the audio buffers that
+  // will be converted into tensors.
+  optional double target_sample_rate = 4;
+
+  // Whether to treat the input audio stream as a continous stream or a batch
+  // of unrelated audio buffers.
+  optional bool streaming_mode = 5 [default = true];
+
+  // Set to false to disable checks for jitter in timestamp values. Useful with
+  // live audio input.
+  optional bool check_inconsistent_timestamps = 6 [default = true];
+}

mediapipe/calculators/tensor/audio_to_tensor_calculator_test.cc

@@ -0,0 +1,483 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cmath>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/strings/substitute.h"
+#include "audio/dsp/resampler_q.h"
+#include "mediapipe/framework/api2/packet.h"
+#include "mediapipe/framework/calculator.pb.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/formats/matrix.h"
+#include "mediapipe/framework/formats/tensor.h"
+#include "mediapipe/framework/port/gtest.h"
+#include "mediapipe/framework/port/parse_text_proto.h"
+#include "mediapipe/framework/port/status_matchers.h"
+#include "mediapipe/framework/timestamp.h"
+
+namespace mediapipe {
+namespace {
+
+std::unique_ptr<Matrix> CreateTestMatrix(int num_channels, int num_samples,
+                                         int timestamp) {
+  auto matrix = std::make_unique<Matrix>(num_channels, num_samples);
+  for (int c = 0; c < num_channels; ++c) {
+    for (int i = 0; i < num_samples; ++i) {
+      // A float value with the sample, channel, and timestamp separated by a
+      // few orders of magnitude, for easy parsing by humans.
+      (*matrix)(c, i) = timestamp / 10000 + i + c / 100.0;
+    }
+  }
+  return matrix;
+}
+
+std::unique_ptr<Matrix> ResampleBuffer(const Matrix& input_matrix,
+                                       double resampling_factor) {
+  audio_dsp::QResamplerParams params;
+  std::vector<float> resampled;
+  int num_channels = input_matrix.rows();
+  std::vector<float> input_data(input_matrix.data(),
+                                input_matrix.data() + input_matrix.size());
+  resampled = audio_dsp::QResampleSignal<float>(
+      1, resampling_factor, num_channels, params, input_data);
+  Matrix res = Eigen::Map<Matrix>(resampled.data(), num_channels,
+                                  resampled.size() / num_channels);
+  return std::make_unique<Matrix>(std::move(res));
+}
+
+class AudioToTensorCalculatorNonStreamingModeTest : public ::testing::Test {
+ protected:
+  void SetUp() override {}
+  void Run(int num_samples, int num_overlapping_samples,
+           double resampling_factor, const Matrix& input_matrix) {
+    double input_sample_rate = 10000;
+    double target_sample_rate = input_sample_rate * resampling_factor;
+    auto graph_config = ParseTextProtoOrDie<CalculatorGraphConfig>(
+        absl::Substitute(R"(
+        input_stream: "audio"
+        input_stream: "sample_rate"
+        output_stream: "tensors"
+        output_stream: "timestamps"
+        node {
+          calculator: "AudioToTensorCalculator"
+          input_stream: "AUDIO:audio"
+          input_stream: "SAMPLE_RATE:sample_rate"
+          output_stream: "TENSORS:tensors"
+          output_stream: "TIMESTAMPS:timestamps"
+          options {
+            [mediapipe.AudioToTensorCalculatorOptions.ext] {
+              num_channels: $0
+              num_samples: $1
+              num_overlapping_samples: $2
+              target_sample_rate: $3
+              streaming_mode: false
+            }
+          }
+        }
+        )",
+                         /*$0=*/input_matrix.rows(),
+                         /*$1=*/num_samples, /*$2=*/num_overlapping_samples,
+                         /*$3=*/target_sample_rate));
+    tool::AddVectorSink("tensors", &graph_config, &tensors_packets_);
+    tool::AddVectorSink("timestamps", &graph_config, &timestamps_packets_);
+
+    // Run the graph.
+    MP_ASSERT_OK(graph_.Initialize(graph_config));
+    MP_ASSERT_OK(graph_.StartRun({}));
+    // Run with the input matrix multiple times.
+    for (int i = 0; i < num_iterations_; ++i) {
+      MP_ASSERT_OK(graph_.AddPacketToInputStream(
+          "audio",
+          MakePacket<Matrix>(input_matrix)
+              .At(Timestamp(i * Timestamp::kTimestampUnitsPerSecond))));
+      MP_ASSERT_OK(graph_.AddPacketToInputStream(
+          "sample_rate",
+          MakePacket<double>(input_sample_rate)
+              .At(Timestamp(i * Timestamp::kTimestampUnitsPerSecond))));
+    }
+    MP_ASSERT_OK(graph_.CloseAllInputStreams());
+    MP_ASSERT_OK(graph_.WaitUntilIdle());
+  }
+
+  void CheckTensorsOutputPackets(const Matrix& expected_matrix,
+                                 int sample_offset, int num_tensors_per_input) {
+    ASSERT_EQ(num_iterations_ * num_tensors_per_input, tensors_packets_.size());
+    for (int i = 0; i < num_iterations_; ++i) {
+      for (int j = 0; j < num_tensors_per_input; ++j) {
+        CheckTensorsOutputPacket(
+            expected_matrix, tensors_packets_[i * num_tensors_per_input + j],
+            /*sample_offset*/ sample_offset * j, /*index=*/j);
+      }
+    }
+  }
+
+  void CheckTensorsOutputPacket(const Matrix& expected_matrix,
+                                const Packet& packet, int sample_offset,
+                                int index) {
+    MP_ASSERT_OK(packet.ValidateAsType<std::vector<Tensor>>());
+    ASSERT_EQ(1, packet.Get<std::vector<Tensor>>().size());
+    const Tensor& output_tensor = packet.Get<std::vector<Tensor>>()[0];
+    auto* buffer = output_tensor.GetCpuReadView().buffer<float>();
+    int num_values = output_tensor.shape().num_elements();
+    const std::vector<float> output_floats(buffer, buffer + num_values);
+    for (int i = 0; i < num_values; ++i) {
+      if (i + sample_offset >= expected_matrix.size()) {
+        EXPECT_FLOAT_EQ(output_floats[i], 0);
+      } else {
+        EXPECT_FLOAT_EQ(output_floats[i],
+                        expected_matrix.coeff((i + sample_offset) % 2,
+                                              (i + sample_offset) / 2))
+            << "i=" << i << ", sample_offset=" << sample_offset;
+      }
+    }
+  }
+
+  void CheckTimestampsOutputPackets(
+      std::vector<int64> expected_timestamp_values) {
+    ASSERT_EQ(num_iterations_, timestamps_packets_.size());
+    for (int i = 0; i < timestamps_packets_.size(); ++i) {
+      const auto& p = timestamps_packets_[i];
+      MP_ASSERT_OK(p.ValidateAsType<std::vector<Timestamp>>());
+      auto output_timestamps = p.Get<std::vector<Timestamp>>();
+      int64 base_timestamp = i * Timestamp::kTimestampUnitsPerSecond;
+      std::vector<Timestamp> expected_timestamps;
+      expected_timestamps.resize(expected_timestamp_values.size());
+      std::transform(
+          expected_timestamp_values.begin(), expected_timestamp_values.end(),
+          expected_timestamps.begin(), [base_timestamp](int64 v) -> Timestamp {
+            return Timestamp(v + base_timestamp);
+          });
+      EXPECT_EQ(expected_timestamps, output_timestamps);
+      EXPECT_EQ(p.Timestamp(), expected_timestamps.back());
+    }
+  }
+
+  // Fully close graph at end, otherwise calculator+tensors are destroyed
+  // after calling WaitUntilDone().
+  void CloseGraph() { MP_EXPECT_OK(graph_.WaitUntilDone()); }
+
+ private:
+  CalculatorGraph graph_;
+  int num_iterations_ = 10;
+  std::vector<Packet> tensors_packets_;
+  std::vector<Packet> timestamps_packets_;
+};
+
+TEST_F(AudioToTensorCalculatorNonStreamingModeTest,
+       ConvertToNoOverlappingFp32Tensors) {
+  auto input_matrix = CreateTestMatrix(2, 8, 0);
+  Run(/*num_samples=*/4, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/1.0f, *input_matrix);
+  CheckTensorsOutputPackets(*input_matrix, /*sample_offset=*/8,
+                            /*num_tensors_per_input=*/2);
+  CheckTimestampsOutputPackets({0, 400});
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorNonStreamingModeTest,
+       ConvertToOverlappingFp32Tensors) {
+  auto input_matrix = CreateTestMatrix(2, 8, 0);
+  Run(/*num_samples=*/4, /*num_overlapping_samples=*/2,
+      /*resampling_factor=*/1.0f, *input_matrix);
+  CheckTensorsOutputPackets(*input_matrix, /*sample_offset=*/4,
+                            /*num_tensors_per_input=*/4);
+  CheckTimestampsOutputPackets({0, 200, 400, 600});
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorNonStreamingModeTest, TensorsWithZeroPadding) {
+  auto input_matrix = CreateTestMatrix(2, 7, 0);
+  Run(/*num_samples=*/4, /*num_overlapping_samples=*/2,
+      /*resampling_factor=*/1.0f, *input_matrix);
+  CheckTensorsOutputPackets(*input_matrix, /*sample_offset=*/4,
+                            /*num_tensors_per_input=*/3);
+  CheckTimestampsOutputPackets({0, 200, 400});
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorNonStreamingModeTest, Downsampling) {
+  auto input_matrix = CreateTestMatrix(2, 1024, 0);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/0.5f, *input_matrix);
+  auto expected_matrix =
+      ResampleBuffer(*input_matrix, /*resampling_factor=*/0.5f);
+  CheckTensorsOutputPackets(*expected_matrix, /*sample_offset=*/512,
+                            /*num_tensors_per_input=*/3);
+  CheckTimestampsOutputPackets({0, 51200, 102400});
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorNonStreamingModeTest,
+       DownsamplingWithOverlapping) {
+  auto input_matrix = CreateTestMatrix(2, 1024, 0);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/64,
+      /*resampling_factor=*/0.5f, *input_matrix);
+  auto expected_matrix =
+      ResampleBuffer(*input_matrix, /*resampling_factor=*/0.5f);
+  CheckTensorsOutputPackets(*expected_matrix, /*sample_offset=*/384,
+                            /*num_tensors_per_input=*/3);
+  CheckTimestampsOutputPackets({0, 38400, 76800});
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorNonStreamingModeTest, Upsampling) {
+  auto input_matrix = CreateTestMatrix(2, 1024, 0);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/2.0f, *input_matrix);
+  auto expected_matrix =
+      ResampleBuffer(*input_matrix, /*resampling_factor=*/2.0f);
+  CheckTensorsOutputPackets(*expected_matrix,
+                            /*sample_offset=*/512,
+                            /*num_tensors_per_input=*/9);
+  CheckTimestampsOutputPackets(
+      {0, 12800, 25600, 38400, 51200, 64000, 76800, 89600, 102400});
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorNonStreamingModeTest, UpsamplingWithOverlapping) {
+  auto input_matrix = CreateTestMatrix(2, 256, 0);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/64,
+      /*resampling_factor=*/2.0f, *input_matrix);
+  auto expected_matrix =
+      ResampleBuffer(*input_matrix, /*resampling_factor=*/2.0f);
+  CheckTensorsOutputPackets(*expected_matrix,
+                            /*sample_offset=*/384,
+                            /*num_tensors_per_input=*/3);
+  CheckTimestampsOutputPackets({0, 9600, 19200});
+  CloseGraph();
+}
+
+class AudioToTensorCalculatorStreamingModeTest : public ::testing::Test {
+ protected:
+  void SetUp() override { sample_buffer_ = std::make_unique<Matrix>(2, 0); }
+
+  void SetInputBufferNumSamplesPerChannel(int num_samples) {
+    input_buffer_num_samples_ = num_samples;
+  }
+
+  void SetNumIterations(int num_iterations) {
+    num_iterations_ = num_iterations;
+  }
+
+  int GetExpectedNumOfSamples() {
+    Matrix* expected_matrix =
+        resampled_buffer_ ? resampled_buffer_.get() : sample_buffer_.get();
+    return expected_matrix->cols();
+  }
+
+  void Run(int num_samples, int num_overlapping_samples,
+           double resampling_factor) {
+    double input_sample_rate = 10000;
+    double target_sample_rate = input_sample_rate * resampling_factor;
+    auto graph_config = ParseTextProtoOrDie<CalculatorGraphConfig>(
+        absl::Substitute(R"(
+        input_stream: "audio"
+        input_stream: "sample_rate"
+        output_stream: "tensors"
+        node {
+          calculator: "AudioToTensorCalculator"
+          input_stream: "AUDIO:audio"
+          input_stream: "SAMPLE_RATE:sample_rate"
+          output_stream: "TENSORS:tensors"
+          options {
+            [mediapipe.AudioToTensorCalculatorOptions.ext] {
+              num_channels: 2
+              num_samples: $0
+              num_overlapping_samples: $1
+              target_sample_rate: $2
+              streaming_mode:true
+            }
+          }
+        }
+        )",
+                         /*$0=*/num_samples, /*$1=*/num_overlapping_samples,
+                         /*$2=*/target_sample_rate));
+    tool::AddVectorSink("tensors", &graph_config, &tensors_packets_);
+
+    // Run the graph.
+    MP_ASSERT_OK(graph_.Initialize(graph_config));
+    MP_ASSERT_OK(graph_.StartRun({}));
+    for (int i = 0; i < num_iterations_; ++i) {
+      Timestamp input_timestamp(Timestamp::kTimestampUnitsPerSecond * i);
+      auto new_data = CreateTestMatrix(2, input_buffer_num_samples_,
+                                       input_timestamp.Value());
+      MP_ASSERT_OK(graph_.AddPacketToInputStream(
+          "audio", MakePacket<Matrix>(*new_data).At(input_timestamp)));
+      MP_ASSERT_OK(graph_.AddPacketToInputStream(
+          "sample_rate",
+          MakePacket<double>(input_sample_rate).At(input_timestamp)));
+      sample_buffer_->conservativeResize(
+          Eigen::NoChange, sample_buffer_->cols() + new_data->cols());
+      sample_buffer_->rightCols(new_data->cols()).swap(*new_data);
+    }
+    MP_ASSERT_OK(graph_.CloseAllInputStreams());
+    MP_ASSERT_OK(graph_.WaitUntilIdle());
+    if (resampling_factor != 1) {
+      resampled_buffer_ = ResampleBuffer(*sample_buffer_, resampling_factor);
+    }
+  }
+
+  void CheckTensorsOutputPackets(int sample_offset, int num_packets,
+                                 int64 timestamp_interval,
+                                 bool output_last_at_close) {
+    ASSERT_EQ(num_packets, tensors_packets_.size());
+    for (int i = 0; i < num_packets; ++i) {
+      if (i == num_packets - 1 && output_last_at_close) {
+        CheckTensorsOutputPacket(sample_offset * i, i, Timestamp::Max());
+      } else {
+        CheckTensorsOutputPacket(sample_offset * i, i,
+                                 Timestamp(timestamp_interval * i));
+      }
+    }
+  }
+
+  void CheckTensorsOutputPacket(int sample_offset, int index,
+                                Timestamp expected_timestamp) {
+    const Packet& p = tensors_packets_[index];
+    MP_ASSERT_OK(p.ValidateAsType<std::vector<Tensor>>());
+    const Tensor& output_tensor = p.Get<std::vector<Tensor>>()[0];
+    auto buffer = output_tensor.GetCpuReadView().buffer<float>();
+    int num_values = output_tensor.shape().num_elements();
+    std::vector<float> output_floats(buffer, buffer + num_values);
+    Matrix* expected_matrix =
+        resampled_buffer_ ? resampled_buffer_.get() : sample_buffer_.get();
+    for (int i = 0; i < num_values; ++i) {
+      if (i + sample_offset >= expected_matrix->size()) {
+        EXPECT_FLOAT_EQ(output_floats[i], 0);
+      } else {
+        EXPECT_NEAR(output_floats[i],
+                    expected_matrix->coeff((i + sample_offset) % 2,
+                                           (i + sample_offset) / 2),
+                    0.001)
+            << "i=" << i << ", sample_offset=" << sample_offset
+            << ", packet index=" << index;
+      }
+    }
+    EXPECT_EQ(p.Timestamp(), expected_timestamp);
+  }
+
+  // Fully close graph at end, otherwise calculator+tensors are destroyed
+  // after calling WaitUntilDone().
+  void CloseGraph() { MP_EXPECT_OK(graph_.WaitUntilDone()); }
+
+ private:
+  int input_buffer_num_samples_ = 10;
+  int num_iterations_ = 10;
+  CalculatorGraph graph_;
+  std::vector<Packet> tensors_packets_;
+  std::unique_ptr<Matrix> sample_buffer_;
+  std::unique_ptr<Matrix> resampled_buffer_;
+};
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest,
+       OutputNoOverlappingFp32Tensors) {
+  Run(/*num_samples=*/5, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/1.0f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/10,
+      /*num_packets=*/std::ceil((float)GetExpectedNumOfSamples() / 5),
+      /*timestamp_interval=*/500,
+      /*output_last_at_close=*/false);
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest, OutputRemainingInCloseMethod) {
+  Run(/*num_samples=*/6, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/1.0f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/12,
+      /*num_packets=*/std::ceil((float)GetExpectedNumOfSamples() / 6),
+      /*timestamp_interval=*/600,
+      /*output_last_at_close=*/true);
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest, OutputOverlappingFp32Tensors) {
+  SetInputBufferNumSamplesPerChannel(12);
+  Run(/*num_samples=*/10, /*num_overlapping_samples=*/2,
+      /*resampling_factor=*/1.0f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/16,
+      /*num_packets=*/std::ceil((float)GetExpectedNumOfSamples() / 8),
+      /*timestamp_interval=*/800,
+      /*output_last_at_close=*/true);
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest, Downsampling) {
+  SetInputBufferNumSamplesPerChannel(1000);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/0.5f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/512,
+      /*num_packets=*/std::ceil((float)GetExpectedNumOfSamples() / 256),
+      /*timestamp_interval=*/51200,
+      /*output_last_at_close=*/true);
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest, DownsamplingWithOverlapping) {
+  SetInputBufferNumSamplesPerChannel(1024);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/64,
+      /*resampling_factor=*/0.5f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/384,
+      /*num_packets=*/std::ceil((float)GetExpectedNumOfSamples() / 192),
+      /*timestamp_interval=*/38400,
+      /*output_last_at_close=*/true);
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest, Upsampling) {
+  SetInputBufferNumSamplesPerChannel(1000);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/2.0f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/512,
+      /*num_packets=*/std::ceil((float)GetExpectedNumOfSamples() / 256),
+      /*timestamp_interval=*/12800,
+      /*output_last_at_close=*/true);
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest, UpsamplingWithOverlapping) {
+  SetInputBufferNumSamplesPerChannel(1024);
+  Run(/*num_samples=*/256, /*num_overlapping_samples=*/64,
+      /*resampling_factor=*/2.0f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/384,
+      /*num_packets=*/std::ceil((float)GetExpectedNumOfSamples() / 192),
+      /*timestamp_interval=*/9600,
+      /*output_last_at_close=*/true);
+  CloseGraph();
+}
+
+TEST_F(AudioToTensorCalculatorStreamingModeTest,
+       OnlyOutputInCloseIfNoSufficientSamples) {
+  SetNumIterations(1);
+  Run(/*num_samples=*/8, /*num_overlapping_samples=*/0,
+      /*resampling_factor=*/0.5f);
+  CheckTensorsOutputPackets(
+      /*sample_offset=*/0,
+      /*num_packets=*/1,
+      /*timestamp_interval=*/0,
+      /*output_last_at_close=*/true);
+  CloseGraph();
+}
+
+}  // namespace
+}  // namespace mediapipe

mediapipe/calculators/tensor/image_to_tensor_calculator.cc

@@ -49,7 +49,6 @@
 #include "mediapipe/calculators/tensor/image_to_tensor_converter_gl_texture.h"
 #include "mediapipe/gpu/gl_calculator_helper.h"
 #endif  // MEDIAPIPE_METAL_ENABLED
-
 #endif  // !MEDIAPIPE_DISABLE_GPU
 
 namespace mediapipe {
@@ -142,11 +141,37 @@ class ImageToTensorCalculator : public Node {
     const auto& options =
         cc->Options<mediapipe::ImageToTensorCalculatorOptions>();
 
-    RET_CHECK(options.has_output_tensor_float_range())
+    RET_CHECK(options.has_output_tensor_float_range() ||
+              options.has_output_tensor_int_range() ||
+              options.has_output_tensor_uint_range())
         << "Output tensor range is required.";
-    RET_CHECK_LT(options.output_tensor_float_range().min(),
-                 options.output_tensor_float_range().max())
-        << "Valid output tensor range is required.";
+    if (options.has_output_tensor_float_range()) {
+      RET_CHECK_LT(options.output_tensor_float_range().min(),
+                   options.output_tensor_float_range().max())
+          << "Valid output float tensor range is required.";
+    }
+    if (options.has_output_tensor_uint_range()) {
+      RET_CHECK_LT(options.output_tensor_uint_range().min(),
+                   options.output_tensor_uint_range().max())
+          << "Valid output uint tensor range is required.";
+      RET_CHECK_GE(options.output_tensor_uint_range().min(), 0)
+          << "The minimum of the output uint tensor range must be "
+             "non-negative.";
+      RET_CHECK_LE(options.output_tensor_uint_range().max(), 255)
+          << "The maximum of the output uint tensor range must be less than or "
+             "equal to 255.";
+    }
+    if (options.has_output_tensor_int_range()) {
+      RET_CHECK_LT(options.output_tensor_int_range().min(),
+                   options.output_tensor_int_range().max())
+          << "Valid output int tensor range is required.";
+      RET_CHECK_GE(options.output_tensor_int_range().min(), -128)
+          << "The minimum of the output int tensor range must be greater than "
+             "or equal to -128.";
+      RET_CHECK_LE(options.output_tensor_int_range().max(), 127)
+          << "The maximum of the output int tensor range must be less than or "
+             "equal to 127.";
+    }
     RET_CHECK_GT(options.output_tensor_width(), 0)
         << "Valid output tensor width is required.";
     RET_CHECK_GT(options.output_tensor_height(), 0)
@@ -175,9 +200,19 @@ class ImageToTensorCalculator : public Node {
     options_ = cc->Options<mediapipe::ImageToTensorCalculatorOptions>();
     output_width_ = options_.output_tensor_width();
     output_height_ = options_.output_tensor_height();
-    range_min_ = options_.output_tensor_float_range().min();
-    range_max_ = options_.output_tensor_float_range().max();
-
+    is_float_output_ = options_.has_output_tensor_float_range();
+    if (options_.has_output_tensor_uint_range()) {
+      range_min_ =
+          static_cast<float>(options_.output_tensor_uint_range().min());
+      range_max_ =
+          static_cast<float>(options_.output_tensor_uint_range().max());
+    } else if (options_.has_output_tensor_int_range()) {
+      range_min_ = static_cast<float>(options_.output_tensor_int_range().min());
+      range_max_ = static_cast<float>(options_.output_tensor_int_range().max());
+    } else {
+      range_min_ = options_.output_tensor_float_range().min();
+      range_max_ = options_.output_tensor_float_range().max();
+    }
     return absl::OkStatus();
   }
 
@@ -225,7 +260,7 @@ class ImageToTensorCalculator : public Node {
     }
 
     // Lazy initialization of the GPU or CPU converter.
-    MP_RETURN_IF_ERROR(InitConverterIfNecessary(cc, image->UsesGpu()));
+    MP_RETURN_IF_ERROR(InitConverterIfNecessary(cc, *image.get()));
 
     ASSIGN_OR_RETURN(Tensor tensor,
                      (image->UsesGpu() ? gpu_converter_ : cpu_converter_)
@@ -257,6 +292,17 @@ class ImageToTensorCalculator : public Node {
     }
   }
 
+  Tensor::ElementType GetOutputTensorType() {
+    if (is_float_output_) {
+      return Tensor::ElementType::kFloat32;
+    }
+    if (range_min_ < 0) {
+      return Tensor::ElementType::kInt8;
+    } else {
+      return Tensor::ElementType::kUInt8;
+    }
+  }
+
   absl::StatusOr<std::shared_ptr<const mediapipe::Image>> GetInputImage(
       CalculatorContext* cc) {
     if (kIn(cc).IsConnected()) {
@@ -283,9 +329,15 @@ class ImageToTensorCalculator : public Node {
     }
   }
 
-  absl::Status InitConverterIfNecessary(CalculatorContext* cc, bool use_gpu) {
+  absl::Status InitConverterIfNecessary(CalculatorContext* cc,
+                                        const Image& image) {
     // Lazy initialization of the GPU or CPU converter.
-    if (use_gpu) {
+    if (image.UsesGpu()) {
+      if (!is_float_output_) {
+        return absl::UnimplementedError(
+            "ImageToTensorConverter for the input GPU image currently doesn't "
+            "support quantization.");
+      }
       if (!gpu_converter_) {
 #if !MEDIAPIPE_DISABLE_GPU
 #if MEDIAPIPE_METAL_ENABLED
@@ -296,17 +348,26 @@ class ImageToTensorCalculator : public Node {
                          CreateImageToGlBufferTensorConverter(
                              cc, DoesGpuInputStartAtBottom(), GetBorderMode()));
 #else
-        ASSIGN_OR_RETURN(gpu_converter_,
-                         CreateImageToGlTextureTensorConverter(
-                             cc, DoesGpuInputStartAtBottom(), GetBorderMode()));
+        // Check whether the underlying storage object is a GL texture.
+        if (image.GetGpuBuffer()
+                .internal_storage<mediapipe::GlTextureBuffer>()) {
+          ASSIGN_OR_RETURN(
+              gpu_converter_,
+              CreateImageToGlTextureTensorConverter(
+                  cc, DoesGpuInputStartAtBottom(), GetBorderMode()));
+        } else {
+          return absl::UnimplementedError(
+              "ImageToTensorConverter for the input GPU image is unavailable.");
+        }
 #endif  // MEDIAPIPE_METAL_ENABLED
 #endif  // !MEDIAPIPE_DISABLE_GPU
       }
     } else {
       if (!cpu_converter_) {
 #if !MEDIAPIPE_DISABLE_OPENCV
-        ASSIGN_OR_RETURN(cpu_converter_,
-                         CreateOpenCvConverter(cc, GetBorderMode()));
+        ASSIGN_OR_RETURN(
+            cpu_converter_,
+            CreateOpenCvConverter(cc, GetBorderMode(), GetOutputTensorType()));
 #else
         LOG(FATAL) << "Cannot create image to tensor opencv converter since "
                       "MEDIAPIPE_DISABLE_OPENCV is defined.";
@@ -321,6 +382,7 @@ class ImageToTensorCalculator : public Node {
   mediapipe::ImageToTensorCalculatorOptions options_;
   int output_width_ = 0;
   int output_height_ = 0;
+  bool is_float_output_ = false;
   float range_min_ = 0.0f;
   float range_max_ = 1.0f;
 };

mediapipe/calculators/tensor/image_to_tensor_calculator.proto

@@ -31,6 +31,22 @@ message ImageToTensorCalculatorOptions {
     optional float max = 2;
   }
 
+  // Range of int values [min, max].
+  // min, must be strictly less than max.
+  // Please note that IntRange is supported for CPU tensors only.
+  message IntRange {
+    optional int64 min = 1;
+    optional int64 max = 2;
+  }
+
+  // Range of uint values [min, max].
+  // min, must be strictly less than max.
+  // Please note that UIntRange is supported for CPU tensors only.
+  message UIntRange {
+    optional uint64 min = 1;
+    optional uint64 max = 2;
+  }
+
   // Pixel extrapolation methods. See @border_mode.
   enum BorderMode {
     BORDER_UNSPECIFIED = 0;
@@ -49,6 +65,8 @@ message ImageToTensorCalculatorOptions {
   // Output tensor element range/type image pixels are converted to.
   oneof range {
     FloatRange output_tensor_float_range = 4;
+    IntRange output_tensor_int_range = 7;
+    UIntRange output_tensor_uint_range = 8;
   }
 
   // For CONVENTIONAL mode for OpenGL, input image starts at bottom and needs

mediapipe/calculators/tensor/image_to_tensor_calculator_test.cc

@@ -61,7 +61,8 @@ void RunTestWithInputImagePacket(const Packet& input_image_packet,
                                  float range_max, int tensor_width,
                                  int tensor_height, bool keep_aspect,
                                  absl::optional<BorderMode> border_mode,
-                                 const mediapipe::NormalizedRect& roi) {
+                                 const mediapipe::NormalizedRect& roi,
+                                 bool output_int_tensor) {
   std::string border_mode_str;
   if (border_mode) {
     switch (*border_mode) {
@@ -73,6 +74,30 @@ void RunTestWithInputImagePacket(const Packet& input_image_packet,
         break;
     }
   }
+  std::string output_tensor_range;
+  if (output_int_tensor) {
+    if (range_min < 0) {
+      output_tensor_range = absl::Substitute(R"(output_tensor_int_range {
+                min: $0
+                max: $1
+              })",
+                                             static_cast<int>(range_min),
+                                             static_cast<int>(range_max));
+    } else {
+      output_tensor_range = absl::Substitute(R"(output_tensor_uint_range {
+                min: $0
+                max: $1
+              })",
+                                             static_cast<uint>(range_min),
+                                             static_cast<uint>(range_max));
+    }
+  } else {
+    output_tensor_range = absl::Substitute(R"(output_tensor_float_range {
+                min: $0
+                max: $1
+              })",
+                                           range_min, range_max);
+  }
   auto graph_config = mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(
       absl::Substitute(R"(
         input_stream: "input_image"
@@ -86,22 +111,18 @@ void RunTestWithInputImagePacket(const Packet& input_image_packet,
             [mediapipe.ImageToTensorCalculatorOptions.ext] {
               output_tensor_width: $0
               output_tensor_height: $1
-              keep_aspect_ratio: $4
-              output_tensor_float_range {
-                min: $2
-                max: $3
-              }
-              $5 # border mode
+              keep_aspect_ratio: $2
+              $3 # output range
+              $4 # border mode
             }
           }
         }
         )",
                        /*$0=*/tensor_width,
                        /*$1=*/tensor_height,
-                       /*$2=*/range_min,
-                       /*$3=*/range_max,
-                       /*$4=*/keep_aspect ? "true" : "false",
-                       /*$5=*/border_mode_str));
+                       /*$2=*/keep_aspect ? "true" : "false",
+                       /*$3=*/output_tensor_range,
+                       /*$4=*/border_mode_str));
 
   std::vector<Packet> output_packets;
   tool::AddVectorSink("tensor", &graph_config, &output_packets);
@@ -126,11 +147,24 @@ void RunTestWithInputImagePacket(const Packet& input_image_packet,
   ASSERT_THAT(tensor_vec, testing::SizeIs(1));
 
   const Tensor& tensor = tensor_vec[0];
-  EXPECT_EQ(tensor.element_type(), Tensor::ElementType::kFloat32);
-
   auto view = tensor.GetCpuReadView();
-  cv::Mat tensor_mat(tensor_height, tensor_width, CV_32FC3,
-                     const_cast<float*>(view.buffer<float>()));
+  cv::Mat tensor_mat;
+  if (output_int_tensor) {
+    if (range_min < 0) {
+      EXPECT_EQ(tensor.element_type(), Tensor::ElementType::kInt8);
+      tensor_mat = cv::Mat(tensor_height, tensor_width, CV_8SC3,
+                           const_cast<int8*>(view.buffer<int8>()));
+    } else {
+      EXPECT_EQ(tensor.element_type(), Tensor::ElementType::kUInt8);
+      tensor_mat = cv::Mat(tensor_height, tensor_width, CV_8UC3,
+                           const_cast<uint8*>(view.buffer<uint8>()));
+    }
+  } else {
+    EXPECT_EQ(tensor.element_type(), Tensor::ElementType::kFloat32);
+    tensor_mat = cv::Mat(tensor_height, tensor_width, CV_32FC3,
+                         const_cast<float*>(view.buffer<float>()));
+  }
+
   cv::Mat result_rgb;
   auto transformation =
       GetValueRangeTransformation(range_min, range_max, 0.0f, 255.0f).value();
@@ -170,16 +204,29 @@ enum class InputType { kImageFrame, kImage };
 const std::vector<InputType> kInputTypesToTest = {InputType::kImageFrame,
                                                   InputType::kImage};
 
-void RunTest(cv::Mat input, cv::Mat expected_result, float range_min,
-             float range_max, int tensor_width, int tensor_height,
-             bool keep_aspect, absl::optional<BorderMode> border_mode,
+void RunTest(cv::Mat input, cv::Mat expected_result,
+             std::vector<std::pair<float, float>> float_ranges,
+             std::vector<std::pair<int, int>> int_ranges, int tensor_width,
+             int tensor_height, bool keep_aspect,
+             absl::optional<BorderMode> border_mode,
              const mediapipe::NormalizedRect& roi) {
   for (auto input_type : kInputTypesToTest) {
-    RunTestWithInputImagePacket(
-        input_type == InputType::kImageFrame ? MakeImageFramePacket(input)
-                                             : MakeImagePacket(input),
-        expected_result, range_min, range_max, tensor_width, tensor_height,
-        keep_aspect, border_mode, roi);
+    for (auto float_range : float_ranges) {
+      RunTestWithInputImagePacket(
+          input_type == InputType::kImageFrame ? MakeImageFramePacket(input)
+                                               : MakeImagePacket(input),
+          expected_result, float_range.first, float_range.second, tensor_width,
+          tensor_height, keep_aspect, border_mode, roi,
+          /*output_int_tensor=*/false);
+    }
+    for (auto int_range : int_ranges) {
+      RunTestWithInputImagePacket(
+          input_type == InputType::kImageFrame ? MakeImageFramePacket(input)
+                                               : MakeImagePacket(input),
+          expected_result, int_range.first, int_range.second, tensor_width,
+          tensor_height, keep_aspect, border_mode, roi,
+          /*output_int_tensor=*/true);
+    }
   }
 }
 
@@ -195,8 +242,8 @@ TEST(ImageToTensorCalculatorTest, MediumSubRectKeepAspect) {
              "tensor/testdata/image_to_tensor/input.jpg"),
       GetRgb("/mediapipe/calculators/"
              "tensor/testdata/image_to_tensor/medium_sub_rect_keep_aspect.png"),
-      /*range_min=*/0.0f,
-      /*range_max=*/1.0f,
+      /*float_ranges=*/{{0.0f, 1.0f}},
+      /*int_ranges=*/{{0, 255}, {-128, 127}},
       /*tensor_width=*/256, /*tensor_height=*/256, /*keep_aspect=*/true,
       /*border mode*/ {}, roi);
 }
@@ -213,8 +260,8 @@ TEST(ImageToTensorCalculatorTest, MediumSubRectKeepAspectBorderZero) {
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/"
                  "medium_sub_rect_keep_aspect_border_zero.png"),
-          /*range_min=*/0.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}, {-128, 127}},
           /*tensor_width=*/256, /*tensor_height=*/256, /*keep_aspect=*/true,
           BorderMode::kZero, roi);
 }
@@ -231,7 +278,8 @@ TEST(ImageToTensorCalculatorTest, MediumSubRectKeepAspectWithRotation) {
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/"
                  "medium_sub_rect_keep_aspect_with_rotation.png"),
-          /*range_min=*/0.0f, /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}},
           /*tensor_width=*/256, /*tensor_height=*/256, /*keep_aspect=*/true,
           BorderMode::kReplicate, roi);
 }
@@ -249,7 +297,8 @@ TEST(ImageToTensorCalculatorTest,
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/"
                  "medium_sub_rect_keep_aspect_with_rotation_border_zero.png"),
-          /*range_min=*/0.0f, /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}, {-128, 127}},
           /*tensor_width=*/256, /*tensor_height=*/256, /*keep_aspect=*/true,
           BorderMode::kZero, roi);
 }
@@ -267,8 +316,8 @@ TEST(ImageToTensorCalculatorTest, MediumSubRectWithRotation) {
       GetRgb(
           "/mediapipe/calculators/"
           "tensor/testdata/image_to_tensor/medium_sub_rect_with_rotation.png"),
-      /*range_min=*/-1.0f,
-      /*range_max=*/1.0f,
+      /*float_ranges=*/{{-1.0f, 1.0f}},
+      /*int_ranges=*/{{0, 255}, {-128, 127}},
       /*tensor_width=*/256, /*tensor_height=*/256, /*keep_aspect=*/false,
       BorderMode::kReplicate, roi);
 }
@@ -285,8 +334,8 @@ TEST(ImageToTensorCalculatorTest, MediumSubRectWithRotationBorderZero) {
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/"
                  "medium_sub_rect_with_rotation_border_zero.png"),
-          /*range_min=*/-1.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{-1.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}, {-128, 127}},
           /*tensor_width=*/256, /*tensor_height=*/256, /*keep_aspect=*/false,
           BorderMode::kZero, roi);
 }
@@ -302,8 +351,8 @@ TEST(ImageToTensorCalculatorTest, LargeSubRect) {
                  "tensor/testdata/image_to_tensor/input.jpg"),
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/large_sub_rect.png"),
-          /*range_min=*/0.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}},
           /*tensor_width=*/128, /*tensor_height=*/128, /*keep_aspect=*/false,
           BorderMode::kReplicate, roi);
 }
@@ -320,8 +369,8 @@ TEST(ImageToTensorCalculatorTest, LargeSubRectBorderZero) {
              "tensor/testdata/image_to_tensor/input.jpg"),
       GetRgb("/mediapipe/calculators/"
              "tensor/testdata/image_to_tensor/large_sub_rect_border_zero.png"),
-      /*range_min=*/0.0f,
-      /*range_max=*/1.0f,
+      /*float_ranges=*/{{0.0f, 1.0f}},
+      /*int_ranges=*/{{0, 255}, {-128, 127}},
       /*tensor_width=*/128, /*tensor_height=*/128, /*keep_aspect=*/false,
       BorderMode::kZero, roi);
 }
@@ -338,8 +387,8 @@ TEST(ImageToTensorCalculatorTest, LargeSubRectKeepAspect) {
              "tensor/testdata/image_to_tensor/input.jpg"),
       GetRgb("/mediapipe/calculators/"
              "tensor/testdata/image_to_tensor/large_sub_rect_keep_aspect.png"),
-      /*range_min=*/0.0f,
-      /*range_max=*/1.0f,
+      /*float_ranges=*/{{0.0f, 1.0f}},
+      /*int_ranges=*/{{0, 255}, {-128, 127}},
       /*tensor_width=*/128, /*tensor_height=*/128, /*keep_aspect=*/true,
       BorderMode::kReplicate, roi);
 }
@@ -356,8 +405,8 @@ TEST(ImageToTensorCalculatorTest, LargeSubRectKeepAspectBorderZero) {
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/"
                  "large_sub_rect_keep_aspect_border_zero.png"),
-          /*range_min=*/0.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}, {-128, 127}},
           /*tensor_width=*/128, /*tensor_height=*/128, /*keep_aspect=*/true,
           BorderMode::kZero, roi);
 }
@@ -374,8 +423,8 @@ TEST(ImageToTensorCalculatorTest, LargeSubRectKeepAspectWithRotation) {
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/"
                  "large_sub_rect_keep_aspect_with_rotation.png"),
-          /*range_min=*/0.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}, {-128, 127}},
           /*tensor_width=*/128, /*tensor_height=*/128, /*keep_aspect=*/true,
           /*border_mode=*/{}, roi);
 }
@@ -393,8 +442,8 @@ TEST(ImageToTensorCalculatorTest,
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/"
                  "large_sub_rect_keep_aspect_with_rotation_border_zero.png"),
-          /*range_min=*/0.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}},
           /*tensor_width=*/128, /*tensor_height=*/128, /*keep_aspect=*/true,
           /*border_mode=*/BorderMode::kZero, roi);
 }
@@ -410,8 +459,8 @@ TEST(ImageToTensorCalculatorTest, NoOpExceptRange) {
                   "tensor/testdata/image_to_tensor/input.jpg"),
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/noop_except_range.png"),
-          /*range_min=*/0.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}, {-128, 127}},
           /*tensor_width=*/64, /*tensor_height=*/128, /*keep_aspect=*/true,
           BorderMode::kReplicate, roi);
 }
@@ -427,8 +476,8 @@ TEST(ImageToTensorCalculatorTest, NoOpExceptRangeBorderZero) {
                   "tensor/testdata/image_to_tensor/input.jpg"),
           GetRgb("/mediapipe/calculators/"
                  "tensor/testdata/image_to_tensor/noop_except_range.png"),
-          /*range_min=*/0.0f,
-          /*range_max=*/1.0f,
+          /*float_ranges=*/{{0.0f, 1.0f}},
+          /*int_ranges=*/{{0, 255}, {-128, 127}},
           /*tensor_width=*/64, /*tensor_height=*/128, /*keep_aspect=*/true,
           BorderMode::kZero, roi);
 }

mediapipe/calculators/tensor/image_to_tensor_converter_gl_buffer.cc

@@ -268,10 +268,12 @@ class GlProcessor : public ImageToTensorConverter {
                                  const RotatedRect& roi,
                                  const Size& output_dims, float range_min,
                                  float range_max) override {
-    if (input.format() != mediapipe::GpuBufferFormat::kBGRA32) {
-      return InvalidArgumentError(
-          absl::StrCat("Only BGRA/RGBA textures are supported, passed format: ",
-                       static_cast<uint32_t>(input.format())));
+    if (input.format() != mediapipe::GpuBufferFormat::kBGRA32 &&
+        input.format() != mediapipe::GpuBufferFormat::kRGBAHalf64 &&
+        input.format() != mediapipe::GpuBufferFormat::kRGBAFloat128) {
+      return InvalidArgumentError(absl::StrCat(
+          "Only 4-channel texture input formats are supported, passed format: ",
+          static_cast<uint32_t>(input.format())));
     }
 
     constexpr int kNumChannels = 3;

mediapipe/calculators/tensor/image_to_tensor_converter_gl_texture.cc

@@ -16,7 +16,7 @@
 
 #include "mediapipe/framework/port.h"
 
-#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30
 
 #include <array>
 #include <memory>
@@ -172,10 +172,12 @@ class GlProcessor : public ImageToTensorConverter {
                                  const RotatedRect& roi,
                                  const Size& output_dims, float range_min,
                                  float range_max) override {
-    if (input.format() != mediapipe::GpuBufferFormat::kBGRA32) {
-      return InvalidArgumentError(
-          absl::StrCat("Only BGRA/RGBA textures are supported, passed format: ",
-                       static_cast<uint32_t>(input.format())));
+    if (input.format() != mediapipe::GpuBufferFormat::kBGRA32 &&
+        input.format() != mediapipe::GpuBufferFormat::kRGBAHalf64 &&
+        input.format() != mediapipe::GpuBufferFormat::kRGBAFloat128) {
+      return InvalidArgumentError(absl::StrCat(
+          "Only 4-channel texture input formats are supported, passed format: ",
+          static_cast<uint32_t>(input.format())));
     }
 
     constexpr int kNumChannels = 3;
@@ -339,4 +341,4 @@ CreateImageToGlTextureTensorConverter(CalculatorContext* cc,
 
 }  // namespace mediapipe
 
-#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30

mediapipe/calculators/tensor/image_to_tensor_converter_gl_texture.h

@@ -17,7 +17,7 @@
 
 #include "mediapipe/framework/port.h"
 
-#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30
 
 #include <memory>
 
@@ -37,6 +37,6 @@ CreateImageToGlTextureTensorConverter(CalculatorContext* cc,
 
 }  // namespace mediapipe
 
-#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30
 
 #endif  // MEDIAPIPE_CALCULATORS_TENSOR_IMAGE_TO_TENSOR_CONVERTER_GL_TEXTURE_H_

mediapipe/calculators/tensor/image_to_tensor_converter_gl_utils.cc

@@ -2,7 +2,7 @@
 
 #include "mediapipe/framework/port.h"
 
-#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30
 
 #include <array>
 #include <memory>
@@ -85,4 +85,4 @@ bool IsGlClampToBorderSupported(const mediapipe::GlContext& gl_context) {
 
 }  // namespace mediapipe
 
-#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30

mediapipe/calculators/tensor/image_to_tensor_converter_gl_utils.h

@@ -3,7 +3,7 @@
 
 #include "mediapipe/framework/port.h"
 
-#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30
 
 #include <array>
 #include <memory>
@@ -40,6 +40,6 @@ bool IsGlClampToBorderSupported(const mediapipe::GlContext& gl_context);
 
 }  // namespace mediapipe
 
-#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30
 
 #endif  // MEDIAPIPE_CALCULATORS_TENSOR_IMAGE_TO_TENSOR_CONVERTER_GL_UTILS_H_

mediapipe/calculators/tensor/image_to_tensor_converter_gl_utils_test.cc

@@ -1,6 +1,6 @@
 #include "mediapipe/framework/port.h"
 
-#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30
 
 #include "mediapipe/calculators/tensor/image_to_tensor_converter_gl_utils.h"
 #include "mediapipe/framework/port/gtest.h"
@@ -46,4 +46,4 @@ TEST(ImageToTensorConverterGlUtilsTest, GlTexParameteriOverrider) {
 }  // namespace
 }  // namespace mediapipe
 
-#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_20
+#endif  // MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_30

mediapipe/calculators/tensor/image_to_tensor_converter_metal.cc

@@ -352,11 +352,12 @@ class MetalProcessor : public ImageToTensorConverter {
                                  const RotatedRect& roi,
                                  const Size& output_dims, float range_min,
                                  float range_max) override {
-    if (input.format() != mediapipe::GpuBufferFormat::kBGRA32) {
-      return InvalidArgumentError(
-          absl::StrCat("Only BGRA/RGBA textures are supported, passed "
-                       "format: ",
-                       static_cast<uint32_t>(input.format())));
+    if (input.format() != mediapipe::GpuBufferFormat::kBGRA32 &&
+        input.format() != mediapipe::GpuBufferFormat::kRGBAHalf64 &&
+        input.format() != mediapipe::GpuBufferFormat::kRGBAFloat128) {
+      return InvalidArgumentError(absl::StrCat(
+          "Only 4-channel texture input formats are supported, passed format: ",
+          static_cast<uint32_t>(input.format())));
     }
 
     @autoreleasepool {

mediapipe/calculators/tensor/image_to_tensor_converter_opencv.cc

@@ -35,7 +35,8 @@ namespace {
 
 class OpenCvProcessor : public ImageToTensorConverter {
  public:
-  OpenCvProcessor(BorderMode border_mode) {
+  OpenCvProcessor(BorderMode border_mode, Tensor::ElementType tensor_type)
+      : tensor_type_(tensor_type) {
     switch (border_mode) {
       case BorderMode::kReplicate:
         border_mode_ = cv::BORDER_REPLICATE;
@@ -44,6 +45,19 @@ class OpenCvProcessor : public ImageToTensorConverter {
         border_mode_ = cv::BORDER_CONSTANT;
         break;
     }
+    switch (tensor_type_) {
+      case Tensor::ElementType::kInt8:
+        mat_type_ = CV_8SC3;
+        break;
+      case Tensor::ElementType::kFloat32:
+        mat_type_ = CV_32FC3;
+        break;
+      case Tensor::ElementType::kUInt8:
+        mat_type_ = CV_8UC3;
+        break;
+      default:
+        mat_type_ = -1;
+    }
   }
 
   absl::StatusOr<Tensor> Convert(const mediapipe::Image& input,
@@ -56,15 +70,30 @@ class OpenCvProcessor : public ImageToTensorConverter {
           absl::StrCat("Only RGBA/RGB formats are supported, passed format: ",
                        static_cast<uint32_t>(input.image_format())));
     }
-    cv::Mat src = mediapipe::formats::MatView(&input);
+    auto src = mediapipe::formats::MatView(&input);
 
     constexpr int kNumChannels = 3;
-    Tensor tensor(
-        Tensor::ElementType::kFloat32,
-        Tensor::Shape{1, output_dims.height, output_dims.width, kNumChannels});
+    Tensor tensor(tensor_type_, Tensor::Shape{1, output_dims.height,
+                                              output_dims.width, kNumChannels});
     auto buffer_view = tensor.GetCpuWriteView();
-    cv::Mat dst(output_dims.height, output_dims.width, CV_32FC3,
-                buffer_view.buffer<float>());
+    cv::Mat dst;
+    switch (tensor_type_) {
+      case Tensor::ElementType::kInt8:
+        dst = cv::Mat(output_dims.height, output_dims.width, mat_type_,
+                      buffer_view.buffer<int8>());
+        break;
+      case Tensor::ElementType::kFloat32:
+        dst = cv::Mat(output_dims.height, output_dims.width, mat_type_,
+                      buffer_view.buffer<float>());
+        break;
+      case Tensor::ElementType::kUInt8:
+        dst = cv::Mat(output_dims.height, output_dims.width, mat_type_,
+                      buffer_view.buffer<uint8>());
+        break;
+      default:
+        return InvalidArgumentError(
+            absl::StrCat("Unsupported tensor type: ", tensor_type_));
+    }
 
     const cv::RotatedRect rotated_rect(cv::Point2f(roi.center_x, roi.center_y),
                                        cv::Size2f(roi.width, roi.height),
@@ -85,7 +114,7 @@ class OpenCvProcessor : public ImageToTensorConverter {
     cv::Mat projection_matrix =
         cv::getPerspectiveTransform(src_points, dst_points);
     cv::Mat transformed;
-    cv::warpPerspective(src, transformed, projection_matrix,
+    cv::warpPerspective(*src, transformed, projection_matrix,
                         cv::Size(dst_width, dst_height),
                         /*flags=*/cv::INTER_LINEAR,
                         /*borderMode=*/border_mode_);
@@ -102,19 +131,29 @@ class OpenCvProcessor : public ImageToTensorConverter {
         auto transform,
         GetValueRangeTransformation(kInputImageRangeMin, kInputImageRangeMax,
                                     range_min, range_max));
-    transformed.convertTo(dst, CV_32FC3, transform.scale, transform.offset);
+    transformed.convertTo(dst, mat_type_, transform.scale, transform.offset);
     return tensor;
   }
 
  private:
   enum cv::BorderTypes border_mode_;
+  Tensor::ElementType tensor_type_;
+  int mat_type_;
 };
 
 }  // namespace
 
 absl::StatusOr<std::unique_ptr<ImageToTensorConverter>> CreateOpenCvConverter(
-    CalculatorContext* cc, BorderMode border_mode) {
-  return absl::make_unique<OpenCvProcessor>(border_mode);
+    CalculatorContext* cc, BorderMode border_mode,
+    Tensor::ElementType tensor_type) {
+  if (tensor_type != Tensor::ElementType::kInt8 &&
+      tensor_type != Tensor::ElementType::kFloat32 &&
+      tensor_type != Tensor::ElementType::kUInt8) {
+    return absl::InvalidArgumentError(absl::StrCat(
+        "Tensor type is currently not supported by OpenCvProcessor, type: ",
+        tensor_type));
+  }
+  return absl::make_unique<OpenCvProcessor>(border_mode, tensor_type);
 }
 
 }  // namespace mediapipe

mediapipe/calculators/tensor/image_to_tensor_converter_opencv.h

@@ -25,7 +25,8 @@ namespace mediapipe {
 
 // Creates OpenCV image-to-tensor converter.
 absl::StatusOr<std::unique_ptr<ImageToTensorConverter>> CreateOpenCvConverter(
-    CalculatorContext* cc, BorderMode border_mode);
+    CalculatorContext* cc, BorderMode border_mode,
+    Tensor::ElementType tensor_type);
 
 }  // namespace mediapipe
 

mediapipe/calculators/tensor/inference_calculator.cc

@@ -19,9 +19,11 @@
 #include <string>
 #include <vector>
 
-#include "absl/memory/memory.h"
 #include "absl/strings/string_view.h"
+#include "mediapipe/calculators/tensor/inference_calculator.pb.h"
+#include "mediapipe/framework/api2/packet.h"
 #include "mediapipe/framework/tool/subgraph_expansion.h"
+#include "tensorflow/lite/core/api/op_resolver.h"
 
 namespace mediapipe {
 namespace api2 {
@@ -36,12 +38,24 @@ class InferenceCalculatorSelectorImpl
         Subgraph::GetOptions<mediapipe::InferenceCalculatorOptions>(
             subgraph_node);
     std::vector<absl::string_view> impls;
+
     const bool should_use_gpu =
         !options.has_delegate() ||  // Use GPU delegate if not specified
         (options.has_delegate() && options.delegate().has_gpu());
     if (should_use_gpu) {
+      const auto& api = options.delegate().gpu().api();
+      using Gpu = ::mediapipe::InferenceCalculatorOptions::Delegate::Gpu;
       impls.emplace_back("Metal");
-      impls.emplace_back("Gl");
+      const bool prefer_gl_advanced =
+          options.delegate().gpu().use_advanced_gpu_api() &&
+          (api == Gpu::ANY || api == Gpu::OPENGL || api == Gpu::OPENCL);
+      if (prefer_gl_advanced) {
+        impls.emplace_back("GlAdvanced");
+        impls.emplace_back("Gl");
+      } else {
+        impls.emplace_back("Gl");
+        impls.emplace_back("GlAdvanced");
+      }
     }
     impls.emplace_back("Cpu");
     for (const auto& suffix : impls) {
@@ -66,5 +80,17 @@ absl::StatusOr<Packet<TfLiteModelPtr>> InferenceCalculator::GetModelAsPacket(
                       "Must specify TFLite model as path or loaded model.");
 }
 
+absl::StatusOr<Packet<tflite::OpResolver>>
+InferenceCalculator::GetOpResolverAsPacket(CalculatorContext* cc) {
+  if (kSideInOpResolver(cc).IsConnected()) {
+    return kSideInOpResolver(cc).As<tflite::OpResolver>();
+  } else if (kSideInCustomOpResolver(cc).IsConnected()) {
+    return kSideInCustomOpResolver(cc).As<tflite::OpResolver>();
+  }
+  return PacketAdopting<tflite::OpResolver>(
+      std::make_unique<
+          tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates>());
+}
+
 }  // namespace api2
 }  // namespace mediapipe

mediapipe/calculators/tensor/inference_calculator.h

@@ -27,6 +27,7 @@
 #include "mediapipe/framework/formats/tensor.h"
 #include "mediapipe/framework/port/ret_check.h"
 #include "mediapipe/util/tflite/tflite_model_loader.h"
+#include "tensorflow/lite/core/api/op_resolver.h"
 #include "tensorflow/lite/error_reporter.h"
 #include "tensorflow/lite/interpreter.h"
 #include "tensorflow/lite/kernels/register.h"
@@ -55,8 +56,11 @@ namespace api2 {
 //  TENSORS - Vector of Tensors
 //
 // Input side packet:
+//  DEPRECATED: Prefer to use the "OP_RESOLVER" input side packet instead.
 //  CUSTOM_OP_RESOLVER (optional) - Use a custom op resolver,
 //                                  instead of the builtin one.
+//  OP_RESOLVER (optional) - Use to provide tflite op resolver
+//                           (tflite::OpResolver)
 //  MODEL (optional) - Use to specify TfLite model
 //                     (std::unique_ptr<tflite::FlatBufferModel,
 //                       std::function<void(tflite::FlatBufferModel*)>>)
@@ -95,15 +99,21 @@ namespace api2 {
 class InferenceCalculator : public NodeIntf {
  public:
   static constexpr Input<std::vector<Tensor>> kInTensors{"TENSORS"};
+  // Deprecated. Prefers to use "OP_RESOLVER" input side packet instead.
+  // TODO: Removes the "CUSTOM_OP_RESOLVER" side input after the
+  // migration.
   static constexpr SideInput<tflite::ops::builtin::BuiltinOpResolver>::Optional
       kSideInCustomOpResolver{"CUSTOM_OP_RESOLVER"};
+  static constexpr SideInput<tflite::OpResolver>::Optional kSideInOpResolver{
+      "OP_RESOLVER"};
   static constexpr SideInput<TfLiteModelPtr>::Optional kSideInModel{"MODEL"};
   static constexpr Output<std::vector<Tensor>> kOutTensors{"TENSORS"};
   static constexpr SideInput<
       mediapipe::InferenceCalculatorOptions::Delegate>::Optional kDelegate{
       "DELEGATE"};
-  MEDIAPIPE_NODE_CONTRACT(kInTensors, kSideInCustomOpResolver, kSideInModel,
-                          kOutTensors, kDelegate);
+  MEDIAPIPE_NODE_CONTRACT(kInTensors, kSideInCustomOpResolver,
+                          kSideInOpResolver, kSideInModel, kOutTensors,
+                          kDelegate);
 
  protected:
   using TfLiteDelegatePtr =
@@ -111,6 +121,9 @@ class InferenceCalculator : public NodeIntf {
 
   absl::StatusOr<Packet<TfLiteModelPtr>> GetModelAsPacket(
       CalculatorContext* cc);
+
+  absl::StatusOr<Packet<tflite::OpResolver>> GetOpResolverAsPacket(
+      CalculatorContext* cc);
 };
 
 struct InferenceCalculatorSelector : public InferenceCalculator {
@@ -121,6 +134,10 @@ struct InferenceCalculatorGl : public InferenceCalculator {
   static constexpr char kCalculatorName[] = "InferenceCalculatorGl";
 };
 
+struct InferenceCalculatorGlAdvanced : public InferenceCalculator {
+  static constexpr char kCalculatorName[] = "InferenceCalculatorGlAdvanced";
+};
+
 struct InferenceCalculatorMetal : public InferenceCalculator {
   static constexpr char kCalculatorName[] = "InferenceCalculatorMetal";
 };

mediapipe/calculators/tensor/inference_calculator.proto

@@ -116,6 +116,9 @@ message InferenceCalculatorOptions {
       // to ensure there is no clash of the tokens. If unspecified, NNAPI will
       // not try caching the compilation.
       optional string model_token = 2;
+      // The name of an accelerator to be used for NNAPI delegate, e.g.
+      // "google-edgetpu". When not specified, it will be selected by NNAPI.
+      optional string accelerator_name = 3;
     }
     message Xnnpack {
       // Number of threads for XNNPACK delegate. (By default, calculator tries

mediapipe/calculators/tensor/inference_calculator_cpu.cc

@@ -19,7 +19,7 @@
 
 #include "absl/memory/memory.h"
 #include "mediapipe/calculators/tensor/inference_calculator.h"
-
+#include "tensorflow/lite/interpreter_builder.h"
 #if defined(MEDIAPIPE_ANDROID)
 #include "tensorflow/lite/delegates/nnapi/nnapi_delegate.h"
 #endif  // ANDROID
@@ -28,6 +28,7 @@
 #include "mediapipe/util/cpu_util.h"
 #endif  // !__EMSCRIPTEN__ || __EMSCRIPTEN_PTHREADS__
 
+#include "tensorflow/lite/c/c_api_types.h"
 #include "tensorflow/lite/delegates/xnnpack/xnnpack_delegate.h"
 
 namespace mediapipe {
@@ -61,6 +62,17 @@ int GetXnnpackNumThreads(
   return GetXnnpackDefaultNumThreads();
 }
 
+template <typename T>
+void CopyTensorBuffer(const Tensor& input_tensor,
+                      tflite::Interpreter* interpreter,
+                      int input_tensor_index) {
+  auto input_tensor_view = input_tensor.GetCpuReadView();
+  auto input_tensor_buffer = input_tensor_view.buffer<T>();
+  T* local_tensor_buffer =
+      interpreter->typed_input_tensor<T>(input_tensor_index);
+  std::memcpy(local_tensor_buffer, input_tensor_buffer, input_tensor.bytes());
+}
+
 }  // namespace
 
 class InferenceCalculatorCpuImpl
@@ -73,14 +85,16 @@ class InferenceCalculatorCpuImpl
   absl::Status Close(CalculatorContext* cc) override;
 
  private:
-  absl::Status LoadModel(CalculatorContext* cc);
-  absl::Status LoadDelegate(CalculatorContext* cc);
-  absl::Status LoadDelegateAndAllocateTensors(CalculatorContext* cc);
+  absl::Status InitInterpreter(CalculatorContext* cc);
+  absl::Status LoadDelegate(CalculatorContext* cc,
+                            tflite::InterpreterBuilder* interpreter_builder);
+  absl::Status AllocateTensors();
 
   // TfLite requires us to keep the model alive as long as the interpreter is.
   Packet<TfLiteModelPtr> model_packet_;
   std::unique_ptr<tflite::Interpreter> interpreter_;
   TfLiteDelegatePtr delegate_;
+  TfLiteType input_tensor_type_ = TfLiteType::kTfLiteNoType;
 };
 
 absl::Status InferenceCalculatorCpuImpl::UpdateContract(
@@ -93,8 +107,7 @@ absl::Status InferenceCalculatorCpuImpl::UpdateContract(
 }
 
 absl::Status InferenceCalculatorCpuImpl::Open(CalculatorContext* cc) {
-  MP_RETURN_IF_ERROR(LoadModel(cc));
-  return LoadDelegateAndAllocateTensors(cc);
+  return InitInterpreter(cc);
 }
 
 absl::Status InferenceCalculatorCpuImpl::Process(CalculatorContext* cc) {
@@ -107,12 +120,24 @@ absl::Status InferenceCalculatorCpuImpl::Process(CalculatorContext* cc) {
 
   // Read CPU input into tensors.
   for (int i = 0; i < input_tensors.size(); ++i) {
-    const Tensor* input_tensor = &input_tensors[i];
-    auto input_tensor_view = input_tensor->GetCpuReadView();
-    auto input_tensor_buffer = input_tensor_view.buffer<float>();
-    float* local_tensor_buffer = interpreter_->typed_input_tensor<float>(i);
-    std::memcpy(local_tensor_buffer, input_tensor_buffer,
-                input_tensor->bytes());
+    switch (input_tensor_type_) {
+      case TfLiteType::kTfLiteFloat16:
+      case TfLiteType::kTfLiteFloat32: {
+        CopyTensorBuffer<float>(input_tensors[i], interpreter_.get(), i);
+        break;
+      }
+      case TfLiteType::kTfLiteUInt8: {
+        CopyTensorBuffer<uint8>(input_tensors[i], interpreter_.get(), i);
+        break;
+      }
+      case TfLiteType::kTfLiteInt8: {
+        CopyTensorBuffer<int8>(input_tensors[i], interpreter_.get(), i);
+        break;
+      }
+      default:
+        return absl::InvalidArgumentError(
+            absl::StrCat("Unsupported input tensor type:", input_tensor_type_));
+    }
   }
 
   // Run inference.
@@ -141,40 +166,34 @@ absl::Status InferenceCalculatorCpuImpl::Close(CalculatorContext* cc) {
   return absl::OkStatus();
 }
 
-absl::Status InferenceCalculatorCpuImpl::LoadModel(CalculatorContext* cc) {
+absl::Status InferenceCalculatorCpuImpl::InitInterpreter(
+    CalculatorContext* cc) {
   ASSIGN_OR_RETURN(model_packet_, GetModelAsPacket(cc));
   const auto& model = *model_packet_.Get();
-  tflite::ops::builtin::BuiltinOpResolver op_resolver =
-      kSideInCustomOpResolver(cc).GetOr(
-          tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates());
-
-  tflite::InterpreterBuilder(model, op_resolver)(&interpreter_);
-  RET_CHECK(interpreter_);
-
+  ASSIGN_OR_RETURN(auto op_resolver_packet, GetOpResolverAsPacket(cc));
+  const auto& op_resolver = op_resolver_packet.Get();
+  tflite::InterpreterBuilder interpreter_builder(model, op_resolver);
+  MP_RETURN_IF_ERROR(LoadDelegate(cc, &interpreter_builder));
 #if defined(__EMSCRIPTEN__)
-  interpreter_->SetNumThreads(1);
+  interpreter_builder.SetNumThreads(1);
 #else
-  interpreter_->SetNumThreads(
+  interpreter_builder.SetNumThreads(
       cc->Options<mediapipe::InferenceCalculatorOptions>().cpu_num_thread());
 #endif  // __EMSCRIPTEN__
 
-  return absl::OkStatus();
+  RET_CHECK_EQ(interpreter_builder(&interpreter_), kTfLiteOk);
+  RET_CHECK(interpreter_);
+  return AllocateTensors();
 }
 
-absl::Status InferenceCalculatorCpuImpl::LoadDelegateAndAllocateTensors(
-    CalculatorContext* cc) {
-  MP_RETURN_IF_ERROR(LoadDelegate(cc));
-
-  // AllocateTensors() can be called only after ModifyGraphWithDelegate.
+absl::Status InferenceCalculatorCpuImpl::AllocateTensors() {
   RET_CHECK_EQ(interpreter_->AllocateTensors(), kTfLiteOk);
-  // TODO: Support quantized tensors.
-  RET_CHECK_NE(
-      interpreter_->tensor(interpreter_->inputs()[0])->quantization.type,
-      kTfLiteAffineQuantization);
+  input_tensor_type_ = interpreter_->tensor(interpreter_->inputs()[0])->type;
   return absl::OkStatus();
 }
 
-absl::Status InferenceCalculatorCpuImpl::LoadDelegate(CalculatorContext* cc) {
+absl::Status InferenceCalculatorCpuImpl::LoadDelegate(
+    CalculatorContext* cc, tflite::InterpreterBuilder* interpreter_builder) {
   const auto& calculator_opts =
       cc->Options<mediapipe::InferenceCalculatorOptions>();
   auto opts_delegate = calculator_opts.delegate();
@@ -203,18 +222,20 @@ absl::Status InferenceCalculatorCpuImpl::LoadDelegate(CalculatorContext* cc) {
   if (nnapi_requested) {
     // Attempt to use NNAPI.
     // If not supported, the default CPU delegate will be created and used.
-    interpreter_->SetAllowFp16PrecisionForFp32(1);
     tflite::StatefulNnApiDelegate::Options options;
     const auto& nnapi = opts_delegate.nnapi();
+    options.allow_fp16 = true;
     // Set up cache_dir and model_token for NNAPI compilation cache.
     options.cache_dir =
         nnapi.has_cache_dir() ? nnapi.cache_dir().c_str() : nullptr;
     options.model_token =
         nnapi.has_model_token() ? nnapi.model_token().c_str() : nullptr;
+    options.accelerator_name = nnapi.has_accelerator_name()
+                                   ? nnapi.accelerator_name().c_str()
+                                   : nullptr;
     delegate_ = TfLiteDelegatePtr(new tflite::StatefulNnApiDelegate(options),
                                   [](TfLiteDelegate*) {});
-    RET_CHECK_EQ(interpreter_->ModifyGraphWithDelegate(delegate_.get()),
-                 kTfLiteOk);
+    interpreter_builder->AddDelegate(delegate_.get());
     return absl::OkStatus();
   }
 #endif  // MEDIAPIPE_ANDROID
@@ -226,13 +247,12 @@ absl::Status InferenceCalculatorCpuImpl::LoadDelegate(CalculatorContext* cc) {
 #endif  // defined(__EMSCRIPTEN__)
 
   if (use_xnnpack) {
-    TfLiteXNNPackDelegateOptions xnnpack_opts{};
+    auto xnnpack_opts = TfLiteXNNPackDelegateOptionsDefault();
     xnnpack_opts.num_threads =
         GetXnnpackNumThreads(opts_has_delegate, opts_delegate);
     delegate_ = TfLiteDelegatePtr(TfLiteXNNPackDelegateCreate(&xnnpack_opts),
                                   &TfLiteXNNPackDelegateDelete);
-    RET_CHECK_EQ(interpreter_->ModifyGraphWithDelegate(delegate_.get()),
-                 kTfLiteOk);
+    interpreter_builder->AddDelegate(delegate_.get());
   }
 
   return absl::OkStatus();

mediapipe/calculators/tensor/inference_calculator_face_detection_test.cc

@@ -75,9 +75,10 @@ const std::vector<Param>& GetParams() {
 class InferenceCalculatorTest : public testing::TestWithParam<Param> {
  protected:
   void SetDelegateForParam(mediapipe::CalculatorGraphConfig_Node* node) {
-    *node->mutable_options()
-         ->MutableExtension(mediapipe::InferenceCalculatorOptions::ext)
-         ->mutable_delegate() = GetParam().delegate;
+    auto options_map = tool::MutableOptionsMap().Initialize(*node);
+    auto options = options_map.Get<mediapipe::InferenceCalculatorOptions>();
+    *options.mutable_delegate() = GetParam().delegate;
+    options_map.Set(options);
   }
 };
 
@@ -154,8 +155,9 @@ TEST_P(InferenceCalculatorTest, TestFaceDetection) {
       detection_packets[0].Get<std::vector<Detection>>();
 #if !defined(MEDIAPIPE_PROTO_LITE)
   // Approximately is not available with lite protos (b/178137094).
-  EXPECT_THAT(dets,
-              ElementsAre(Approximately(EqualsProto(expected_detection))));
+  constexpr float kEpison = 0.001;
+  EXPECT_THAT(dets, ElementsAre(Approximately(EqualsProto(expected_detection),
+                                              kEpison)));
 #endif
 }
 

mediapipe/calculators/tensor/inference_calculator_gl.cc

@@ -20,22 +20,8 @@
 #include "absl/memory/memory.h"
 #include "absl/status/status.h"
 #include "mediapipe/calculators/tensor/inference_calculator.h"
-#include "mediapipe/framework/deps/file_path.h"
-#include "mediapipe/util/tflite/config.h"
-
-#if MEDIAPIPE_TFLITE_GL_INFERENCE
 #include "mediapipe/gpu/gl_calculator_helper.h"
-#include "mediapipe/gpu/gpu_buffer.h"
-#include "mediapipe/util/tflite/tflite_gpu_runner.h"
-#include "tensorflow/lite/delegates/gpu/common/shape.h"
 #include "tensorflow/lite/delegates/gpu/gl_delegate.h"
-#endif  // MEDIAPIPE_TFLITE_GL_INFERENCE
-
-#if defined(MEDIAPIPE_ANDROID)
-#include "mediapipe/util/android/file/base/file.h"
-#include "mediapipe/util/android/file/base/filesystem.h"
-#include "mediapipe/util/android/file/base/helpers.h"
-#endif  // ANDROID
 
 namespace mediapipe {
 namespace api2 {
@@ -50,41 +36,22 @@ class InferenceCalculatorGlImpl
   absl::Status Close(CalculatorContext* cc) override;
 
  private:
-  absl::Status ReadGpuCaches();
-  absl::Status SaveGpuCaches();
   absl::Status LoadModel(CalculatorContext* cc);
   absl::Status LoadDelegate(CalculatorContext* cc);
   absl::Status LoadDelegateAndAllocateTensors(CalculatorContext* cc);
-  absl::Status InitTFLiteGPURunner(CalculatorContext* cc);
 
   // TfLite requires us to keep the model alive as long as the interpreter is.
   Packet<TfLiteModelPtr> model_packet_;
-  std::unique_ptr<tflite::Interpreter> interpreter_;
-  TfLiteDelegatePtr delegate_;
 
-#if MEDIAPIPE_TFLITE_GL_INFERENCE
   mediapipe::GlCalculatorHelper gpu_helper_;
-  std::unique_ptr<tflite::gpu::TFLiteGPURunner> tflite_gpu_runner_;
   bool allow_precision_loss_ = false;
-  mediapipe::InferenceCalculatorOptions::Delegate::Gpu::Api
-      tflite_gpu_runner_api_;
-  mediapipe::InferenceCalculatorOptions::Delegate::Gpu::InferenceUsage
-      tflite_gpu_runner_usage_;
-#endif  // MEDIAPIPE_TFLITE_GL_INFERENCE
 
-#if MEDIAPIPE_TFLITE_GPU_SUPPORTED
+  TfLiteDelegatePtr delegate_;
+  std::unique_ptr<tflite::Interpreter> interpreter_;
+
   std::vector<Tensor::Shape> output_shapes_;
   std::vector<std::unique_ptr<Tensor>> gpu_buffers_in_;
   std::vector<std::unique_ptr<Tensor>> gpu_buffers_out_;
-#endif  // MEDIAPIPE_TFLITE_GPU_SUPPORTED
-
-  bool use_advanced_gpu_api_ = false;
-  bool use_gpu_delegate_ = false;
-
-  bool use_kernel_caching_ = false;
-  std::string cached_kernel_filename_;
-  bool use_serialized_model_ = false;
-  std::string serialized_model_path_;
 };
 
 absl::Status InferenceCalculatorGlImpl::UpdateContract(CalculatorContract* cc) {
@@ -92,8 +59,7 @@ absl::Status InferenceCalculatorGlImpl::UpdateContract(CalculatorContract* cc) {
   RET_CHECK(!options.model_path().empty() ^ kSideInModel(cc).IsConnected())
       << "Either model as side packet or model path in options is required.";
 
-  MP_RETURN_IF_ERROR(mediapipe::GlCalculatorHelper::UpdateContract(cc));
-  return absl::OkStatus();
+  return mediapipe::GlCalculatorHelper::UpdateContract(cc);
 }
 
 absl::Status InferenceCalculatorGlImpl::Open(CalculatorContext* cc) {
@@ -109,46 +75,12 @@ absl::Status InferenceCalculatorGlImpl::Open(CalculatorContext* cc) {
         << "for Gpu";
     delegate.MergeFrom(input_side_packet_delegate);
   }
-  const bool has_delegate = options.has_delegate() || !kDelegate(cc).IsEmpty();
-  use_advanced_gpu_api_ = has_delegate && delegate.has_gpu() &&
-                          delegate.gpu().use_advanced_gpu_api();
-  allow_precision_loss_ = delegate.gpu().allow_precision_loss();
-  tflite_gpu_runner_api_ = delegate.gpu().api();
-  tflite_gpu_runner_usage_ = delegate.gpu().usage();
-  use_kernel_caching_ =
-      use_advanced_gpu_api_ && delegate.gpu().has_cached_kernel_path();
-  use_serialized_model_ = use_advanced_gpu_api_ &&
-                          delegate.gpu().has_serialized_model_dir() &&
-                          delegate.gpu().has_model_token();
-  use_gpu_delegate_ = !use_advanced_gpu_api_;
-
-  if (use_kernel_caching_) {
-#ifdef MEDIAPIPE_ANDROID
-    cached_kernel_filename_ = delegate.gpu().cached_kernel_path() +
-                              mediapipe::File::Basename(options.model_path()) +
-                              ".ker";
-#endif  // MEDIAPIPE_ANDROID
-  }
-  if (use_serialized_model_) {
-#ifdef MEDIAPIPE_ANDROID
-    serialized_model_path_ = mediapipe::file::JoinPath(
-        delegate.gpu().serialized_model_dir(), delegate.gpu().model_token());
-#endif  // MEDIAPIPE_ANDROID
-  }
-
-  // When use_advanced_gpu_api_, model loading is handled in InitTFLiteGPURunner
-  // for everything.
-  if (!use_advanced_gpu_api_) {
-    MP_RETURN_IF_ERROR(LoadModel(cc));
-  }
 
+  MP_RETURN_IF_ERROR(LoadModel(cc));
   MP_RETURN_IF_ERROR(gpu_helper_.Open(cc));
-  MP_RETURN_IF_ERROR(
-      gpu_helper_.RunInGlContext([this, &cc]() -> ::mediapipe::Status {
-        return use_advanced_gpu_api_ ? InitTFLiteGPURunner(cc)
-                                     : LoadDelegateAndAllocateTensors(cc);
-      }));
-  return absl::OkStatus();
+  return gpu_helper_.RunInGlContext([this, &cc]() -> ::mediapipe::Status {
+    return LoadDelegateAndAllocateTensors(cc);
+  });
 }
 
 absl::Status InferenceCalculatorGlImpl::Process(CalculatorContext* cc) {
@@ -159,212 +91,71 @@ absl::Status InferenceCalculatorGlImpl::Process(CalculatorContext* cc) {
   RET_CHECK(!input_tensors.empty());
   auto output_tensors = absl::make_unique<std::vector<Tensor>>();
 
-  if (use_advanced_gpu_api_) {
-    MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext(
-        [this, &input_tensors, &output_tensors]() -> ::mediapipe::Status {
-          for (int i = 0; i < input_tensors.size(); ++i) {
-            MP_RETURN_IF_ERROR(tflite_gpu_runner_->BindSSBOToInputTensor(
-                input_tensors[i].GetOpenGlBufferReadView().name(), i));
-          }
-          output_tensors->reserve(output_shapes_.size());
-          for (int i = 0; i < output_shapes_.size(); ++i) {
-            output_tensors->emplace_back(Tensor::ElementType::kFloat32,
-                                         output_shapes_[i]);
-            MP_RETURN_IF_ERROR(tflite_gpu_runner_->BindSSBOToOutputTensor(
-                output_tensors->back().GetOpenGlBufferWriteView().name(), i));
-          }
-          return absl::OkStatus();
-        }));
-  } else {
-    MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext(
-        [this, &input_tensors]() -> ::mediapipe::Status {
-          // Explicitly copy input.
-          for (int i = 0; i < input_tensors.size(); ++i) {
-            glBindBuffer(GL_COPY_READ_BUFFER,
-                         input_tensors[i].GetOpenGlBufferReadView().name());
-            glBindBuffer(GL_COPY_WRITE_BUFFER,
-                         gpu_buffers_in_[i]->GetOpenGlBufferWriteView().name());
-            glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0,
-                                input_tensors[i].bytes());
-          }
-          return absl::OkStatus();
-        }));
-  }
+  MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext(
+      [this, &input_tensors]() -> ::mediapipe::Status {
+        // Explicitly copy input.
+        for (int i = 0; i < input_tensors.size(); ++i) {
+          glBindBuffer(GL_COPY_READ_BUFFER,
+                       input_tensors[i].GetOpenGlBufferReadView().name());
+          glBindBuffer(GL_COPY_WRITE_BUFFER,
+                       gpu_buffers_in_[i]->GetOpenGlBufferWriteView().name());
+          glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0,
+                              input_tensors[i].bytes());
+        }
+        return absl::OkStatus();
+      }));
 
   // Run inference.
-  if (use_advanced_gpu_api_) {
-    RET_CHECK(tflite_gpu_runner_->Invoke().ok());
-  } else {
-    RET_CHECK_EQ(interpreter_->Invoke(), kTfLiteOk);
-  }
+  RET_CHECK_EQ(interpreter_->Invoke(), kTfLiteOk);
 
-  if (use_gpu_delegate_) {
-    MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext(
-        [this, &output_tensors]() -> ::mediapipe::Status {
-          output_tensors->reserve(output_shapes_.size());
-          for (int i = 0; i < output_shapes_.size(); ++i) {
-            const auto& t = gpu_buffers_out_[i];
-            output_tensors->emplace_back(Tensor::ElementType::kFloat32,
-                                         gpu_buffers_out_[i]->shape());
-            auto read_view = t->GetOpenGlBufferReadView();
-            glBindBuffer(GL_COPY_READ_BUFFER, read_view.name());
-            auto write_view = output_tensors->back().GetOpenGlBufferWriteView();
-            glBindBuffer(GL_COPY_WRITE_BUFFER, write_view.name());
-            glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0,
-                                t->bytes());
-          }
-          return absl::OkStatus();
-        }));
-  }
-  // Output tensors are already bound if use_advanced_gpu_api_ is true.
+  MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext(
+      [this, &output_tensors]() -> ::mediapipe::Status {
+        output_tensors->reserve(output_shapes_.size());
+        for (int i = 0; i < output_shapes_.size(); ++i) {
+          const auto& t = gpu_buffers_out_[i];
+          output_tensors->emplace_back(Tensor::ElementType::kFloat32,
+                                       gpu_buffers_out_[i]->shape());
+          auto read_view = t->GetOpenGlBufferReadView();
+          glBindBuffer(GL_COPY_READ_BUFFER, read_view.name());
+          auto write_view = output_tensors->back().GetOpenGlBufferWriteView();
+          glBindBuffer(GL_COPY_WRITE_BUFFER, write_view.name());
+          glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0,
+                              t->bytes());
+        }
+        return absl::OkStatus();
+      }));
 
   kOutTensors(cc).Send(std::move(output_tensors));
   return absl::OkStatus();
 }
 
-absl::Status InferenceCalculatorGlImpl::SaveGpuCaches() {
-#ifdef MEDIAPIPE_ANDROID
-  if (use_kernel_caching_) {
-    // Save kernel file.
-    auto kernel_cache = absl::make_unique<std::vector<uint8_t>>(
-        tflite_gpu_runner_->GetSerializedBinaryCache());
-    std::string cache_str(kernel_cache->begin(), kernel_cache->end());
-    MP_RETURN_IF_ERROR(
-        mediapipe::file::SetContents(cached_kernel_filename_, cache_str));
-  }
-  if (use_serialized_model_) {
-    // Save serialized model file.
-    ASSIGN_OR_RETURN(std::vector<uint8_t> serialized_model_vec,
-                     tflite_gpu_runner_->GetSerializedModel());
-    absl::string_view serialized_model(
-        reinterpret_cast<char*>(serialized_model_vec.data()),
-        serialized_model_vec.size());
-    MP_RETURN_IF_ERROR(
-        mediapipe::file::SetContents(serialized_model_path_, serialized_model));
-  }
-#endif  // MEDIAPIPE_ANDROID
-  return absl::OkStatus();
-}
-
 absl::Status InferenceCalculatorGlImpl::Close(CalculatorContext* cc) {
-  MP_RETURN_IF_ERROR(SaveGpuCaches());
-  if (use_gpu_delegate_) {
-    MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext([this]() -> Status {
-      gpu_buffers_in_.clear();
-      gpu_buffers_out_.clear();
-      return absl::OkStatus();
-    }));
-  }
-
-  interpreter_ = nullptr;
-  delegate_ = nullptr;
-  return absl::OkStatus();
-}
-
-absl::Status InferenceCalculatorGlImpl::ReadGpuCaches() {
-#ifdef MEDIAPIPE_ANDROID
-  if (use_kernel_caching_ && File::Exists(cached_kernel_filename_)) {
-    // Load pre-compiled kernel file.
-    std::string cache_str;
-    MP_RETURN_IF_ERROR(
-        mediapipe::file::GetContents(cached_kernel_filename_, &cache_str));
-    std::vector<uint8_t> cache_vec(cache_str.begin(), cache_str.end());
-    tflite_gpu_runner_->SetSerializedBinaryCache(std::move(cache_vec));
-  }
-  if (use_serialized_model_ && File::Exists(serialized_model_path_)) {
-    // Load serialized model file.
-    std::string serialized_model_str;
-    MP_RETURN_IF_ERROR(
-        file::GetContents(serialized_model_path_, &serialized_model_str));
-    std::vector<uint8_t> serialized_model_vec(serialized_model_str.begin(),
-                                              serialized_model_str.end());
-    tflite_gpu_runner_->SetSerializedModel(std::move(serialized_model_vec));
-  }
-#endif  // MEDIAPIPE_ANDROID
-  return absl::OkStatus();
-}
-
-absl::Status InferenceCalculatorGlImpl::InitTFLiteGPURunner(
-    CalculatorContext* cc) {
-  ASSIGN_OR_RETURN(model_packet_, GetModelAsPacket(cc));
-  const auto& model = *model_packet_.Get();
-  tflite::ops::builtin::BuiltinOpResolver op_resolver =
-      kSideInCustomOpResolver(cc).GetOr(
-          tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates());
-
-  // Create runner
-  tflite::gpu::InferenceOptions options;
-  options.priority1 = allow_precision_loss_
-                          ? tflite::gpu::InferencePriority::MIN_LATENCY
-                          : tflite::gpu::InferencePriority::MAX_PRECISION;
-  options.priority2 = tflite::gpu::InferencePriority::AUTO;
-  options.priority3 = tflite::gpu::InferencePriority::AUTO;
-  switch (tflite_gpu_runner_usage_) {
-    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::
-        FAST_SINGLE_ANSWER: {
-      options.usage = tflite::gpu::InferenceUsage::FAST_SINGLE_ANSWER;
-      break;
-    }
-    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::
-        SUSTAINED_SPEED: {
-      options.usage = tflite::gpu::InferenceUsage::SUSTAINED_SPEED;
-      break;
-    }
-    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::UNSPECIFIED: {
-      return absl::InternalError("inference usage need to be specified.");
-    }
-  }
-  tflite_gpu_runner_ = std::make_unique<tflite::gpu::TFLiteGPURunner>(options);
-  switch (tflite_gpu_runner_api_) {
-    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::ANY: {
-      // Do not need to force any specific API.
-      break;
-    }
-    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::OPENGL: {
-      tflite_gpu_runner_->ForceOpenGL();
-      break;
-    }
-    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::OPENCL: {
-      tflite_gpu_runner_->ForceOpenCL();
-      break;
-    }
-  }
-  MP_RETURN_IF_ERROR(tflite_gpu_runner_->InitializeWithModel(
-      model, op_resolver, /*allow_quant_ops=*/true));
-
-  // Create and bind OpenGL buffers for outputs.
-  // The buffers are created once and their ids are passed to calculator outputs
-  output_shapes_.resize(tflite_gpu_runner_->outputs_size());
-  for (int i = 0; i < tflite_gpu_runner_->outputs_size(); ++i) {
-    output_shapes_[i] = {tflite_gpu_runner_->GetOutputShapes()[i].b,
-                         tflite_gpu_runner_->GetOutputShapes()[i].h,
-                         tflite_gpu_runner_->GetOutputShapes()[i].w,
-                         tflite_gpu_runner_->GetOutputShapes()[i].c};
-  }
-
-  MP_RETURN_IF_ERROR(ReadGpuCaches());
-
-  MP_RETURN_IF_ERROR(tflite_gpu_runner_->Build());
-
-  return absl::OkStatus();
+  return gpu_helper_.RunInGlContext([this]() -> absl::Status {
+    gpu_buffers_in_.clear();
+    gpu_buffers_out_.clear();
+    // Delegate must outlive the interpreter, hence the order is important.
+    interpreter_ = nullptr;
+    delegate_ = nullptr;
+    return absl::OkStatus();
+  });
 }
 
 absl::Status InferenceCalculatorGlImpl::LoadModel(CalculatorContext* cc) {
   ASSIGN_OR_RETURN(model_packet_, GetModelAsPacket(cc));
   const auto& model = *model_packet_.Get();
-  tflite::ops::builtin::BuiltinOpResolver op_resolver =
-      kSideInCustomOpResolver(cc).GetOr(
-          tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates());
-
-  tflite::InterpreterBuilder(model, op_resolver)(&interpreter_);
+  if (kSideInOpResolver(cc).IsConnected()) {
+    const tflite::OpResolver& op_resolver = kSideInOpResolver(cc).Get();
+    tflite::InterpreterBuilder(model, op_resolver)(&interpreter_);
+  } else {
+    tflite::ops::builtin::BuiltinOpResolver op_resolver =
+        kSideInCustomOpResolver(cc).GetOr(
+            tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates());
+    tflite::InterpreterBuilder(model, op_resolver)(&interpreter_);
+  }
   RET_CHECK(interpreter_);
 
-#if defined(__EMSCRIPTEN__)
-  interpreter_->SetNumThreads(1);
-#else
   interpreter_->SetNumThreads(
       cc->Options<mediapipe::InferenceCalculatorOptions>().cpu_num_thread());
-#endif  // __EMSCRIPTEN__
 
   return absl::OkStatus();
 }

mediapipe/calculators/tensor/inference_calculator_gl_advanced.cc

@@ -0,0 +1,285 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstring>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/memory/memory.h"
+#include "absl/status/status.h"
+#include "mediapipe/calculators/tensor/inference_calculator.h"
+#include "mediapipe/gpu/gl_calculator_helper.h"
+#include "mediapipe/util/tflite/tflite_gpu_runner.h"
+
+#if defined(MEDIAPIPE_ANDROID)
+#include "mediapipe/framework/deps/file_path.h"
+#include "mediapipe/util/android/file/base/file.h"
+#include "mediapipe/util/android/file/base/filesystem.h"
+#include "mediapipe/util/android/file/base/helpers.h"
+#endif  // ANDROID
+
+namespace mediapipe {
+namespace api2 {
+
+// Runs TFLite GPU delegate API2 directly, bypassing interpreter usage, and
+// allows choosing specific API.
+//
+// To trigger this code path:
+//   [mediapipe.InferenceCalculatorOptions.ext] {
+//     delegate {
+//       gpu {
+//         use_advanced_gpu_api: true
+//         api: OPENCL  # or OPENGL or ANY
+//       }
+//     }
+//   }
+class InferenceCalculatorGlAdvancedImpl
+    : public NodeImpl<InferenceCalculatorGlAdvanced,
+                      InferenceCalculatorGlAdvancedImpl> {
+ public:
+  static absl::Status UpdateContract(CalculatorContract* cc);
+
+  absl::Status Open(CalculatorContext* cc) override;
+  absl::Status Process(CalculatorContext* cc) override;
+  absl::Status Close(CalculatorContext* cc) override;
+
+ private:
+  absl::Status ReadGpuCaches();
+  absl::Status SaveGpuCaches();
+  absl::Status InitTFLiteGPURunner(CalculatorContext* cc);
+
+  // TfLite requires us to keep the model alive as long as the interpreter is.
+  Packet<TfLiteModelPtr> model_packet_;
+
+  mediapipe::GlCalculatorHelper gpu_helper_;
+  std::unique_ptr<tflite::gpu::TFLiteGPURunner> tflite_gpu_runner_;
+  bool allow_precision_loss_ = false;
+  mediapipe::InferenceCalculatorOptions::Delegate::Gpu::Api
+      tflite_gpu_runner_api_;
+  mediapipe::InferenceCalculatorOptions::Delegate::Gpu::InferenceUsage
+      tflite_gpu_runner_usage_;
+
+  std::vector<Tensor::Shape> output_shapes_;
+
+  bool use_kernel_caching_ = false;
+  std::string cached_kernel_filename_;
+  bool use_serialized_model_ = false;
+  std::string serialized_model_path_;
+};
+
+absl::Status InferenceCalculatorGlAdvancedImpl::UpdateContract(
+    CalculatorContract* cc) {
+  const auto& options = cc->Options<::mediapipe::InferenceCalculatorOptions>();
+  RET_CHECK(!options.model_path().empty() ^ kSideInModel(cc).IsConnected())
+      << "Either model as side packet or model path in options is required.";
+
+  MP_RETURN_IF_ERROR(mediapipe::GlCalculatorHelper::UpdateContract(cc));
+  return absl::OkStatus();
+}
+
+absl::Status InferenceCalculatorGlAdvancedImpl::Open(CalculatorContext* cc) {
+  const auto& options = cc->Options<::mediapipe::InferenceCalculatorOptions>();
+  mediapipe::InferenceCalculatorOptions::Delegate delegate = options.delegate();
+  if (!kDelegate(cc).IsEmpty()) {
+    mediapipe::InferenceCalculatorOptions::Delegate input_side_packet_delegate =
+        kDelegate(cc).Get();
+    CHECK(input_side_packet_delegate.has_gpu() ||
+          input_side_packet_delegate.delegate_case() ==
+              mediapipe::InferenceCalculatorOptions::Delegate::DELEGATE_NOT_SET)
+        << "inference_calculator_gl_advanced only supports delegate input side "
+           "packet for Gpu";
+    delegate.MergeFrom(input_side_packet_delegate);
+  }
+  allow_precision_loss_ = delegate.gpu().allow_precision_loss();
+  tflite_gpu_runner_api_ = delegate.gpu().api();
+  tflite_gpu_runner_usage_ = delegate.gpu().usage();
+  use_kernel_caching_ = delegate.gpu().has_cached_kernel_path();
+  use_serialized_model_ = delegate.gpu().has_serialized_model_dir() &&
+                          delegate.gpu().has_model_token();
+
+  if (use_kernel_caching_) {
+#ifdef MEDIAPIPE_ANDROID
+    cached_kernel_filename_ = delegate.gpu().cached_kernel_path() +
+                              mediapipe::File::Basename(options.model_path()) +
+                              ".ker";
+#endif  // MEDIAPIPE_ANDROID
+  }
+  if (use_serialized_model_) {
+#ifdef MEDIAPIPE_ANDROID
+    serialized_model_path_ = mediapipe::file::JoinPath(
+        delegate.gpu().serialized_model_dir(), delegate.gpu().model_token());
+#endif  // MEDIAPIPE_ANDROID
+  }
+
+  MP_RETURN_IF_ERROR(gpu_helper_.Open(cc));
+  return gpu_helper_.RunInGlContext(
+      [this, &cc]() -> absl::Status { return InitTFLiteGPURunner(cc); });
+}
+
+absl::Status InferenceCalculatorGlAdvancedImpl::Process(CalculatorContext* cc) {
+  if (kInTensors(cc).IsEmpty()) {
+    return absl::OkStatus();
+  }
+  const auto& input_tensors = *kInTensors(cc);
+  RET_CHECK(!input_tensors.empty());
+  auto output_tensors = absl::make_unique<std::vector<Tensor>>();
+
+  MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext(
+      [this, &input_tensors, &output_tensors]() -> absl::Status {
+        for (int i = 0; i < input_tensors.size(); ++i) {
+          MP_RETURN_IF_ERROR(tflite_gpu_runner_->BindSSBOToInputTensor(
+              input_tensors[i].GetOpenGlBufferReadView().name(), i));
+        }
+        output_tensors->reserve(output_shapes_.size());
+        for (int i = 0; i < output_shapes_.size(); ++i) {
+          output_tensors->emplace_back(Tensor::ElementType::kFloat32,
+                                       output_shapes_[i]);
+          MP_RETURN_IF_ERROR(tflite_gpu_runner_->BindSSBOToOutputTensor(
+              output_tensors->back().GetOpenGlBufferWriteView().name(), i));
+        }
+        return absl::OkStatus();
+      }));
+
+  // Run inference.
+  MP_RETURN_IF_ERROR(tflite_gpu_runner_->Invoke());
+  kOutTensors(cc).Send(std::move(output_tensors));
+  return absl::OkStatus();
+}
+
+absl::Status InferenceCalculatorGlAdvancedImpl::SaveGpuCaches() {
+#ifdef MEDIAPIPE_ANDROID
+  if (use_kernel_caching_) {
+    // Save kernel file.
+    auto kernel_cache = absl::make_unique<std::vector<uint8_t>>(
+        tflite_gpu_runner_->GetSerializedBinaryCache());
+    std::string cache_str(kernel_cache->begin(), kernel_cache->end());
+    MP_RETURN_IF_ERROR(
+        mediapipe::file::SetContents(cached_kernel_filename_, cache_str));
+  }
+  if (use_serialized_model_) {
+    // Save serialized model file.
+    ASSIGN_OR_RETURN(std::vector<uint8_t> serialized_model_vec,
+                     tflite_gpu_runner_->GetSerializedModel());
+    absl::string_view serialized_model(
+        reinterpret_cast<char*>(serialized_model_vec.data()),
+        serialized_model_vec.size());
+    MP_RETURN_IF_ERROR(
+        mediapipe::file::SetContents(serialized_model_path_, serialized_model));
+  }
+#endif  // MEDIAPIPE_ANDROID
+  return absl::OkStatus();
+}
+
+absl::Status InferenceCalculatorGlAdvancedImpl::Close(CalculatorContext* cc) {
+  MP_RETURN_IF_ERROR(SaveGpuCaches());
+  return gpu_helper_.RunInGlContext([this]() -> absl::Status {
+    tflite_gpu_runner_.reset();
+    return absl::OkStatus();
+  });
+}
+
+absl::Status InferenceCalculatorGlAdvancedImpl::ReadGpuCaches() {
+#ifdef MEDIAPIPE_ANDROID
+  if (use_kernel_caching_ && File::Exists(cached_kernel_filename_)) {
+    // Load pre-compiled kernel file.
+    std::string cache_str;
+    MP_RETURN_IF_ERROR(
+        mediapipe::file::GetContents(cached_kernel_filename_, &cache_str));
+    std::vector<uint8_t> cache_vec(cache_str.begin(), cache_str.end());
+    tflite_gpu_runner_->SetSerializedBinaryCache(std::move(cache_vec));
+  }
+  if (use_serialized_model_ && File::Exists(serialized_model_path_)) {
+    // Load serialized model file.
+    std::string serialized_model_str;
+    MP_RETURN_IF_ERROR(
+        file::GetContents(serialized_model_path_, &serialized_model_str));
+    std::vector<uint8_t> serialized_model_vec(serialized_model_str.begin(),
+                                              serialized_model_str.end());
+    tflite_gpu_runner_->SetSerializedModel(std::move(serialized_model_vec));
+  }
+#endif  // MEDIAPIPE_ANDROID
+  return absl::OkStatus();
+}
+
+absl::Status InferenceCalculatorGlAdvancedImpl::InitTFLiteGPURunner(
+    CalculatorContext* cc) {
+  ASSIGN_OR_RETURN(model_packet_, GetModelAsPacket(cc));
+  const auto& model = *model_packet_.Get();
+
+  // Create runner
+  tflite::gpu::InferenceOptions options;
+  options.priority1 = allow_precision_loss_
+                          ? tflite::gpu::InferencePriority::MIN_LATENCY
+                          : tflite::gpu::InferencePriority::MAX_PRECISION;
+  options.priority2 = tflite::gpu::InferencePriority::AUTO;
+  options.priority3 = tflite::gpu::InferencePriority::AUTO;
+  switch (tflite_gpu_runner_usage_) {
+    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::
+        FAST_SINGLE_ANSWER: {
+      options.usage = tflite::gpu::InferenceUsage::FAST_SINGLE_ANSWER;
+      break;
+    }
+    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::
+        SUSTAINED_SPEED: {
+      options.usage = tflite::gpu::InferenceUsage::SUSTAINED_SPEED;
+      break;
+    }
+    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::UNSPECIFIED: {
+      return absl::InternalError("inference usage need to be specified.");
+    }
+  }
+  tflite_gpu_runner_ = std::make_unique<tflite::gpu::TFLiteGPURunner>(options);
+  switch (tflite_gpu_runner_api_) {
+    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::ANY: {
+      // Do not need to force any specific API.
+      break;
+    }
+    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::OPENGL: {
+      tflite_gpu_runner_->ForceOpenGL();
+      break;
+    }
+    case mediapipe::InferenceCalculatorOptions::Delegate::Gpu::OPENCL: {
+      tflite_gpu_runner_->ForceOpenCL();
+      break;
+    }
+  }
+  if (kSideInOpResolver(cc).IsConnected()) {
+    const tflite::OpResolver& op_resolver = kSideInOpResolver(cc).Get();
+    MP_RETURN_IF_ERROR(tflite_gpu_runner_->InitializeWithModel(
+        model, op_resolver, /*allow_quant_ops=*/true));
+  } else {
+    tflite::ops::builtin::BuiltinOpResolver op_resolver =
+        kSideInCustomOpResolver(cc).GetOr(
+            tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates());
+    MP_RETURN_IF_ERROR(tflite_gpu_runner_->InitializeWithModel(
+        model, op_resolver, /*allow_quant_ops=*/true));
+  }
+
+  // Create and bind OpenGL buffers for outputs.
+  // The buffers are created once and their ids are passed to calculator outputs
+  output_shapes_.resize(tflite_gpu_runner_->outputs_size());
+  for (int i = 0; i < tflite_gpu_runner_->outputs_size(); ++i) {
+    output_shapes_[i] = {tflite_gpu_runner_->GetOutputShapes()[i].b,
+                         tflite_gpu_runner_->GetOutputShapes()[i].h,
+                         tflite_gpu_runner_->GetOutputShapes()[i].w,
+                         tflite_gpu_runner_->GetOutputShapes()[i].c};
+  }
+
+  MP_RETURN_IF_ERROR(ReadGpuCaches());
+  return tflite_gpu_runner_->Build();
+}
+
+}  // namespace api2
+}  // namespace mediapipe

mediapipe/calculators/tensor/inference_calculator_metal.cc

@@ -90,9 +90,10 @@ class InferenceCalculatorMetalImpl
   absl::Status Close(CalculatorContext* cc) override;
 
  private:
-  absl::Status LoadModel(CalculatorContext* cc);
-  absl::Status LoadDelegate(CalculatorContext* cc);
-  absl::Status LoadDelegateAndAllocateTensors(CalculatorContext* cc);
+  absl::Status InitInterpreter(CalculatorContext* cc);
+  void AddDelegate(CalculatorContext* cc,
+                   tflite::InterpreterBuilder* interpreter_builder);
+  absl::Status CreateConverters(CalculatorContext* cc);
 
   // TfLite requires us to keep the model alive as long as the interpreter is.
   Packet<TfLiteModelPtr> model_packet_;
@@ -127,11 +128,9 @@ absl::Status InferenceCalculatorMetalImpl::Open(CalculatorContext* cc) {
   const auto& options = cc->Options<::mediapipe::InferenceCalculatorOptions>();
   allow_precision_loss_ = options.delegate().gpu().allow_precision_loss();
 
-  MP_RETURN_IF_ERROR(LoadModel(cc));
-
   gpu_helper_ = [[MPPMetalHelper alloc] initWithCalculatorContext:cc];
   RET_CHECK(gpu_helper_);
-  return LoadDelegateAndAllocateTensors(cc);
+  return InitInterpreter(cc);
 }
 
 absl::Status InferenceCalculatorMetalImpl::Process(CalculatorContext* cc) {
@@ -199,27 +198,20 @@ absl::Status InferenceCalculatorMetalImpl::Close(CalculatorContext* cc) {
   return absl::OkStatus();
 }
 
-absl::Status InferenceCalculatorMetalImpl::LoadModel(CalculatorContext* cc) {
+absl::Status InferenceCalculatorMetalImpl::InitInterpreter(
+    CalculatorContext* cc) {
   ASSIGN_OR_RETURN(model_packet_, GetModelAsPacket(cc));
   const auto& model = *model_packet_.Get();
-  tflite::ops::builtin::BuiltinOpResolver op_resolver =
-      kSideInCustomOpResolver(cc).GetOr(
-          tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates());
-
-  tflite::InterpreterBuilder(model, op_resolver)(&interpreter_);
+  ASSIGN_OR_RETURN(auto op_resolver_packet, GetOpResolverAsPacket(cc));
+  const auto& op_resolver = op_resolver_packet.Get();
+  tflite::InterpreterBuilder interpreter_builder(model, op_resolver);
+  AddDelegate(cc, &interpreter_builder);
+  interpreter_builder.SetNumThreads(
+      cc->Options<mediapipe::InferenceCalculatorOptions>().cpu_num_thread());
+  RET_CHECK_EQ(interpreter_builder(&interpreter_), kTfLiteOk);
   RET_CHECK(interpreter_);
 
-  interpreter_->SetNumThreads(
-      cc->Options<mediapipe::InferenceCalculatorOptions>().cpu_num_thread());
-
-  return absl::OkStatus();
-}
-
-absl::Status InferenceCalculatorMetalImpl::LoadDelegateAndAllocateTensors(
-    CalculatorContext* cc) {
-  MP_RETURN_IF_ERROR(LoadDelegate(cc));
-
-  // AllocateTensors() can be called only after ModifyGraphWithDelegate.
+  MP_RETURN_IF_ERROR(CreateConverters(cc));
   RET_CHECK_EQ(interpreter_->AllocateTensors(), kTfLiteOk);
   // TODO: Support quantized tensors.
   RET_CHECK_NE(
@@ -228,7 +220,8 @@ absl::Status InferenceCalculatorMetalImpl::LoadDelegateAndAllocateTensors(
   return absl::OkStatus();
 }
 
-absl::Status InferenceCalculatorMetalImpl::LoadDelegate(CalculatorContext* cc) {
+void InferenceCalculatorMetalImpl::AddDelegate(
+    CalculatorContext* cc, tflite::InterpreterBuilder* interpreter_builder) {
   const auto& calculator_opts =
       cc->Options<mediapipe::InferenceCalculatorOptions>();
 
@@ -242,9 +235,11 @@ absl::Status InferenceCalculatorMetalImpl::LoadDelegate(CalculatorContext* cc) {
   options.wait_type = TFLGpuDelegateWaitType::TFLGpuDelegateWaitTypeDoNotWait;
   delegate_ =
       TfLiteDelegatePtr(TFLGpuDelegateCreate(&options), &TFLGpuDelegateDelete);
-  RET_CHECK_EQ(interpreter_->ModifyGraphWithDelegate(delegate_.get()),
-               kTfLiteOk);
+  interpreter_builder->AddDelegate(delegate_.get());
+}
 
+absl::Status InferenceCalculatorMetalImpl::CreateConverters(
+    CalculatorContext* cc) {
   id<MTLDevice> device = gpu_helper_.mtlDevice;
 
   // Get input image sizes.

mediapipe/calculators/tensor/inference_calculator_test.cc

@@ -38,61 +38,13 @@
 #endif  // defined(__APPLE__)
 
 namespace mediapipe {
+namespace {
 
-void DoSmokeTest(const std::string& graph_proto) {
-  const int width = 8;
-  const int height = 8;
-  const int channels = 3;
-  // Prepare input tensor.
-  auto input_vec = absl::make_unique<std::vector<Tensor>>();
-  input_vec->emplace_back(Tensor::ElementType::kFloat32,
-                          Tensor::Shape{1, height, width, channels});
-  {
-    auto view1 = input_vec->back().GetCpuWriteView();
-    auto tensor_buffer = view1.buffer<float>();
-    ASSERT_NE(tensor_buffer, nullptr);
-    for (int i = 0; i < width * height * channels - 1; i++) {
-      tensor_buffer[i] = 1;
-    }
-  }
+constexpr int kTensorWidth = 8;
+constexpr int kTensorHeight = 8;
+constexpr int kTensorChannels = 3;
 
-  // Prepare single calculator graph to and wait for packets.
-  CalculatorGraphConfig graph_config =
-      ParseTextProtoOrDie<CalculatorGraphConfig>(graph_proto);
-  std::vector<Packet> output_packets;
-  tool::AddVectorSink("tensor_out", &graph_config, &output_packets);
-  CalculatorGraph graph(graph_config);
-  MP_ASSERT_OK(graph.StartRun({}));
-
-  // Push the tensor into the graph.
-  MP_ASSERT_OK(graph.AddPacketToInputStream(
-      "tensor_in", Adopt(input_vec.release()).At(Timestamp(0))));
-  // Wait until the calculator done processing.
-  MP_ASSERT_OK(graph.WaitUntilIdle());
-  ASSERT_EQ(1, output_packets.size());
-
-  // Get and process results.
-  const std::vector<Tensor>& result_vec =
-      output_packets[0].Get<std::vector<Tensor>>();
-  ASSERT_EQ(1, result_vec.size());
-
-  const Tensor& result = result_vec[0];
-  auto view = result.GetCpuReadView();
-  auto result_buffer = view.buffer<float>();
-  ASSERT_NE(result_buffer, nullptr);
-  for (int i = 0; i < width * height * channels - 1; i++) {
-    ASSERT_EQ(3, result_buffer[i]);
-  }
-
-  // Fully close graph at end, otherwise calculator+tensors are destroyed
-  // after calling WaitUntilDone().
-  MP_ASSERT_OK(graph.CloseInputStream("tensor_in"));
-  MP_ASSERT_OK(graph.WaitUntilDone());
-}
-
-// Tests a simple add model that adds an input tensor to itself.
-TEST(InferenceCalculatorTest, SmokeTest) {
-  std::string graph_proto = R"(
+constexpr char kGraphWithModelPathInOption[] = R"(
     input_stream: "tensor_in"
     node {
       calculator: "InferenceCalculator"
@@ -106,18 +58,7 @@ TEST(InferenceCalculatorTest, SmokeTest) {
       }
     }
   )";
-  // Test CPU inference only.
-  DoSmokeTest(/*graph_proto=*/absl::StrReplaceAll(
-      graph_proto, {{"$delegate", "delegate { tflite {} }"}}));
-  DoSmokeTest(absl::StrReplaceAll(graph_proto,
-                                  {{"$delegate", "delegate { xnnpack {} }"}}));
-  DoSmokeTest(absl::StrReplaceAll(
-      graph_proto,
-      {{"$delegate", "delegate { xnnpack { num_threads: 10 } }"}}));
-}
-
-TEST(InferenceCalculatorTest, SmokeTest_ModelAsInputSidePacket) {
-  std::string graph_proto = R"(
+constexpr char kGraphWithModelAsInputSidePacket[] = R"(
     input_stream: "tensor_in"
 
     node {
@@ -154,7 +95,84 @@ TEST(InferenceCalculatorTest, SmokeTest_ModelAsInputSidePacket) {
       }
     }
   )";
-  DoSmokeTest(graph_proto);
+
+std::vector<Tensor> CreateInputs() {
+  std::vector<Tensor> input_vec;
+  // Prepare input tensor.
+  input_vec.emplace_back(
+      Tensor::ElementType::kFloat32,
+      Tensor::Shape{1, kTensorHeight, kTensorWidth, kTensorChannels});
+  {
+    auto view = input_vec.back().GetCpuWriteView();
+    auto num_elements = input_vec.back().shape().num_elements();
+    auto tensor_buffer = view.buffer<float>();
+    for (int i = 0; i < num_elements; i++) {
+      tensor_buffer[i] = 1;
+    }
+  }
+
+  return input_vec;
 }
 
+void RunGraphThenClose(CalculatorGraph& graph, std::vector<Tensor> input_vec) {
+  MP_ASSERT_OK(graph.StartRun({}));
+
+  // Push the tensor into the graph.
+  MP_ASSERT_OK(graph.AddPacketToInputStream(
+      "tensor_in",
+      MakePacket<std::vector<Tensor>>(std::move(input_vec)).At(Timestamp(0))));
+  // Wait until the calculator done processing.
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+
+  // Fully close graph at end, otherwise calculator+tensors are destroyed
+  // after calling WaitUntilDone().
+  MP_ASSERT_OK(graph.CloseInputStream("tensor_in"));
+  MP_ASSERT_OK(graph.WaitUntilDone());
+}
+
+void DoSmokeTest(const std::string& graph_proto) {
+  auto input_vec = CreateInputs();
+
+  // Prepare single calculator graph to and wait for packets.
+  CalculatorGraphConfig graph_config =
+      ParseTextProtoOrDie<CalculatorGraphConfig>(graph_proto);
+  std::vector<Packet> output_packets;
+  tool::AddVectorSink("tensor_out", &graph_config, &output_packets);
+  CalculatorGraph graph(graph_config);
+
+  RunGraphThenClose(graph, std::move(input_vec));
+
+  ASSERT_EQ(1, output_packets.size());
+
+  // Get and process results.
+  const std::vector<Tensor>& result_vec =
+      output_packets[0].Get<std::vector<Tensor>>();
+  ASSERT_EQ(1, result_vec.size());
+
+  const Tensor& result = result_vec[0];
+  auto view = result.GetCpuReadView();
+  auto result_buffer = view.buffer<float>();
+  ASSERT_NE(result_buffer, nullptr);
+  for (int i = 0; i < result.shape().num_elements(); i++) {
+    ASSERT_EQ(3, result_buffer[i]);
+  }
+}
+
+// Tests a simple add model that adds an input tensor to itself.
+TEST(InferenceCalculatorTest, SmokeTest) {
+  // Test CPU inference only.
+  DoSmokeTest(/*graph_proto=*/absl::StrReplaceAll(
+      kGraphWithModelPathInOption, {{"$delegate", "delegate { tflite {} }"}}));
+  DoSmokeTest(absl::StrReplaceAll(kGraphWithModelPathInOption,
+                                  {{"$delegate", "delegate { xnnpack {} }"}}));
+  DoSmokeTest(absl::StrReplaceAll(
+      kGraphWithModelPathInOption,
+      {{"$delegate", "delegate { xnnpack { num_threads: 10 } }"}}));
+}
+
+TEST(InferenceCalculatorTest, ModelAsInputSidePacketSmokeTest) {
+  DoSmokeTest(kGraphWithModelAsInputSidePacket);
+}
+
+}  // namespace
 }  // namespace mediapipe

mediapipe/calculators/tensor/tensors_to_classification_calculator.cc

@@ -16,7 +16,6 @@
 #include <unordered_map>
 #include <vector>
 
-#include "absl/container/node_hash_map.h"
 #include "absl/strings/str_format.h"
 #include "absl/types/span.h"
 #include "mediapipe/calculators/tensor/tensors_to_classification_calculator.pb.h"
@@ -25,6 +24,7 @@
 #include "mediapipe/framework/formats/classification.pb.h"
 #include "mediapipe/framework/formats/tensor.h"
 #include "mediapipe/framework/port/ret_check.h"
+#include "mediapipe/util/label_map.pb.h"
 #include "mediapipe/util/resource_util.h"
 #if defined(MEDIAPIPE_MOBILE)
 #include "mediapipe/util/android/file/base/file.h"
@@ -35,6 +35,17 @@
 
 namespace mediapipe {
 namespace api2 {
+namespace {
+
+void SetClassificationLabel(const LabelMapItem label_map_item,
+                            Classification* classification) {
+  classification->set_label(label_map_item.name());
+  if (label_map_item.has_display_name()) {
+    classification->set_display_name(label_map_item.display_name());
+  }
+}
+
+}  // namespace
 
 // Convert result tensors from classification models into MediaPipe
 // classifications.
@@ -54,7 +65,6 @@ namespace api2 {
 //   output_stream: "CLASSIFICATIONS:classifications"
 //   options: {
 //     [mediapipe.TensorsToClassificationCalculatorOptions.ext] {
-//       num_classes: 1024
 //       min_score_threshold: 0.1
 //       label_map_path: "labelmap.txt"
 //     }
@@ -72,22 +82,35 @@ class TensorsToClassificationCalculator : public Node {
   absl::Status Close(CalculatorContext* cc) override;
 
  private:
-  ::mediapipe::TensorsToClassificationCalculatorOptions options_;
   int top_k_ = 0;
-  absl::node_hash_map<int, std::string> label_map_;
+  bool sort_by_descending_score_ = false;
+  proto_ns::Map<int64, LabelMapItem> local_label_map_;
   bool label_map_loaded_ = false;
+  bool is_binary_classification_ = false;
+  float min_score_threshold_ = std::numeric_limits<float>::lowest();
+
+  // Set of allowed or ignored class indices.
+  struct ClassIndexSet {
+    absl::flat_hash_set<int> values;
+    bool is_allowlist;
+  };
+  // Allowed or ignored class indices based on provided options.
+  // These are used to filter out the output classification results.
+  ClassIndexSet class_index_set_;
+  bool IsClassIndexAllowed(int class_index);
+  const proto_ns::Map<int64, LabelMapItem>& GetLabelMap(CalculatorContext* cc);
 };
 MEDIAPIPE_REGISTER_NODE(TensorsToClassificationCalculator);
 
 absl::Status TensorsToClassificationCalculator::Open(CalculatorContext* cc) {
-  options_ =
-      cc->Options<::mediapipe::TensorsToClassificationCalculatorOptions>();
+  const auto& options = cc->Options<TensorsToClassificationCalculatorOptions>();
 
-  top_k_ = options_.top_k();
-  if (options_.has_label_map_path()) {
+  top_k_ = options.top_k();
+  sort_by_descending_score_ = options.sort_by_descending_score();
+  if (options.has_label_map_path()) {
     std::string string_path;
     ASSIGN_OR_RETURN(string_path,
-                     PathToResourceAsFile(options_.label_map_path()));
+                     PathToResourceAsFile(options.label_map_path()));
     std::string label_map_string;
     MP_RETURN_IF_ERROR(
         mediapipe::GetResourceContents(string_path, &label_map_string));
@@ -96,18 +119,45 @@ absl::Status TensorsToClassificationCalculator::Open(CalculatorContext* cc) {
     std::string line;
     int i = 0;
     while (std::getline(stream, line)) {
-      label_map_[i++] = line;
+      LabelMapItem item;
+      item.set_name(line);
+      local_label_map_[i++] = item;
     }
     label_map_loaded_ = true;
-  } else if (options_.has_label_map()) {
-    for (int i = 0; i < options_.label_map().entries_size(); ++i) {
-      const auto& entry = options_.label_map().entries(i);
-      RET_CHECK(!label_map_.contains(entry.id()))
+  } else if (!options.label_items().empty()) {
+    label_map_loaded_ = true;
+  } else if (options.has_label_map()) {
+    for (int i = 0; i < options.label_map().entries_size(); ++i) {
+      const auto& entry = options.label_map().entries(i);
+      RET_CHECK(!local_label_map_.contains(entry.id()))
           << "Duplicate id found: " << entry.id();
-      label_map_[entry.id()] = entry.label();
+      LabelMapItem item;
+      item.set_name(entry.label());
+      local_label_map_[entry.id()] = item;
     }
     label_map_loaded_ = true;
   }
+  if (options.has_min_score_threshold()) {
+    min_score_threshold_ = options.min_score_threshold();
+  }
+  is_binary_classification_ = options.binary_classification();
+
+  if (is_binary_classification_) {
+    RET_CHECK(options.allow_classes().empty() &&
+              options.ignore_classes().empty());
+  }
+  if (!options.allow_classes().empty()) {
+    RET_CHECK(options.ignore_classes().empty());
+    class_index_set_.is_allowlist = true;
+    for (int i = 0; i < options.allow_classes_size(); ++i) {
+      class_index_set_.values.insert(options.allow_classes(i));
+    }
+  } else {
+    class_index_set_.is_allowlist = false;
+    for (int i = 0; i < options.ignore_classes_size(); ++i) {
+      class_index_set_.values.insert(options.ignore_classes(i));
+    }
+  }
 
   return absl::OkStatus();
 }
@@ -118,19 +168,19 @@ absl::Status TensorsToClassificationCalculator::Process(CalculatorContext* cc) {
 
   int num_classes = input_tensors[0].shape().num_elements();
 
-  if (options_.binary_classification()) {
+  if (is_binary_classification_) {
     RET_CHECK_EQ(num_classes, 1);
     // Number of classes for binary classification.
     num_classes = 2;
   }
   if (label_map_loaded_) {
-    RET_CHECK_EQ(num_classes, label_map_.size());
+    RET_CHECK_EQ(num_classes, GetLabelMap(cc).size());
   }
   auto view = input_tensors[0].GetCpuReadView();
   auto raw_scores = view.buffer<float>();
 
   auto classification_list = absl::make_unique<ClassificationList>();
-  if (options_.binary_classification()) {
+  if (is_binary_classification_) {
     Classification* class_first = classification_list->add_classification();
     Classification* class_second = classification_list->add_classification();
     class_first->set_index(0);
@@ -139,41 +189,48 @@ absl::Status TensorsToClassificationCalculator::Process(CalculatorContext* cc) {
     class_second->set_score(1. - raw_scores[0]);
 
     if (label_map_loaded_) {
-      class_first->set_label(label_map_[0]);
-      class_second->set_label(label_map_[1]);
+      SetClassificationLabel(GetLabelMap(cc).at(0), class_first);
+      SetClassificationLabel(GetLabelMap(cc).at(1), class_second);
     }
   } else {
     for (int i = 0; i < num_classes; ++i) {
-      if (options_.has_min_score_threshold() &&
-          raw_scores[i] < options_.min_score_threshold()) {
+      if (!IsClassIndexAllowed(i)) {
+        continue;
+      }
+      if (raw_scores[i] < min_score_threshold_) {
         continue;
       }
       Classification* classification =
           classification_list->add_classification();
       classification->set_index(i);
       classification->set_score(raw_scores[i]);
-
       if (label_map_loaded_) {
-        classification->set_label(label_map_[i]);
+        SetClassificationLabel(GetLabelMap(cc).at(i), classification);
       }
     }
   }
 
-  // Note that partial_sort will raise error when top_k_ >
-  // classification_list->classification_size().
-  CHECK_GE(classification_list->classification_size(), top_k_);
   auto raw_classification_list = classification_list->mutable_classification();
-  if (top_k_ > 0 && classification_list->classification_size() >= top_k_) {
+  if (top_k_ > 0) {
+    int desired_size =
+        std::min(classification_list->classification_size(), top_k_);
     std::partial_sort(raw_classification_list->begin(),
-                      raw_classification_list->begin() + top_k_,
+                      raw_classification_list->begin() + desired_size,
                       raw_classification_list->end(),
                       [](const Classification a, const Classification b) {
                         return a.score() > b.score();
                       });
 
-    // Resizes the underlying list to have only top_k_ classifications.
-    raw_classification_list->DeleteSubrange(
-        top_k_, raw_classification_list->size() - top_k_);
+    if (desired_size >= top_k_) {
+      // Resizes the underlying list to have only top_k_ classifications.
+      raw_classification_list->DeleteSubrange(
+          top_k_, raw_classification_list->size() - top_k_);
+    }
+  } else if (sort_by_descending_score_) {
+    std::sort(raw_classification_list->begin(), raw_classification_list->end(),
+              [](const Classification a, const Classification b) {
+                return a.score() > b.score();
+              });
   }
   kOutClassificationList(cc).Send(std::move(classification_list));
   return absl::OkStatus();
@@ -183,5 +240,24 @@ absl::Status TensorsToClassificationCalculator::Close(CalculatorContext* cc) {
   return absl::OkStatus();
 }
 
+bool TensorsToClassificationCalculator::IsClassIndexAllowed(int class_index) {
+  if (class_index_set_.values.empty()) {
+    return true;
+  }
+  if (class_index_set_.is_allowlist) {
+    return class_index_set_.values.contains(class_index);
+  } else {
+    return !class_index_set_.values.contains(class_index);
+  }
+}
+
+const proto_ns::Map<int64, LabelMapItem>&
+TensorsToClassificationCalculator::GetLabelMap(CalculatorContext* cc) {
+  return !local_label_map_.empty()
+             ? local_label_map_
+             : cc->Options<TensorsToClassificationCalculatorOptions>()
+                   .label_items();
+}
+
 }  // namespace api2
 }  // namespace mediapipe

mediapipe/calculators/tensor/tensors_to_classification_calculator.proto

@@ -19,6 +19,7 @@ syntax = "proto2";
 package mediapipe;
 
 import "mediapipe/framework/calculator.proto";
+import "mediapipe/util/label_map.proto";
 
 message TensorsToClassificationCalculatorOptions {
   extend .mediapipe.CalculatorOptions {
@@ -38,16 +39,37 @@ message TensorsToClassificationCalculatorOptions {
   // Number of highest scoring labels to output.  If top_k is not positive then
   // all labels are used.
   optional int32 top_k = 2;
+  // Whether results should be sorted by descending score. By default, results
+  // may or may not be sorted: setting this to true guarantees that the returned
+  // results will be sorted by descending score.
+  optional bool sort_by_descending_score = 9;
   // Path to a label map file for getting the actual name of class ids.
   optional string label_map_path = 3;
   // Label map. (Can be used instead of label_map_path.)
-  // NOTE: "label_map_path", if specified, takes precedence over "label_map".
+  // NOTE: either "label_map_path" or "label_items", if specified, takes
+  // precedence over "label_map".
+  // Deprecated: please use `label_items` instead.
   optional LabelMap label_map = 5;
 
+  // Label items. (Can be used instead of label_map_path.)
+  // NOTE: "label_map_path", if specified, takes precedence over "label_items".
+  map<int64, LabelMapItem> label_items = 6;
+
   // Whether the input is a single float for binary classification.
   // When true, only a single float is expected in the input tensor and the
   // label map, if provided, is expected to have exactly two labels.
   // The single score(float) represent the probability of first label, and
   // 1 - score is the probabilility of the second label.
   optional bool binary_classification = 4;
+
+  // The ids of classes that should be ignored during decoding the score for
+  // each classification. If `ignore_classes` is specified, all the other
+  // classes that are not in the `ignore_class` field will be considered during
+  // decoding. `ignore_classes` and `allow_classes` are mutually  exclusive.
+  repeated int32 ignore_classes = 7 [packed = true];
+  // The ids of classes that will be allowed during decoding the score for
+  // each classification. If `allow_classes` is specified, all the other classes
+  // that are not in the `allow_classes` field will be completely ignored.
+  // `ignore_classes` and `allow_classes` are mutually exclusive.
+  repeated int32 allow_classes = 8 [packed = true];
 }

mediapipe/calculators/tensor/tensors_to_classification_calculator_test.cc

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <algorithm>
+#include <limits>
 #include <vector>
 
 #include "absl/memory/memory.h"
@@ -206,4 +208,119 @@ TEST_F(TensorsToClassificationCalculatorTest, CorrectOutputWithTopK) {
   }
 }
 
+TEST_F(TensorsToClassificationCalculatorTest,
+       CorrectOutputWithSortByDescendingScore) {
+  mediapipe::CalculatorRunner runner(ParseTextProtoOrDie<Node>(R"pb(
+    calculator: "TensorsToClassificationCalculator"
+    input_stream: "TENSORS:tensors"
+    output_stream: "CLASSIFICATIONS:classifications"
+    options {
+      [mediapipe.TensorsToClassificationCalculatorOptions.ext] {
+        sort_by_descending_score: true
+      }
+    }
+  )pb"));
+
+  BuildGraph(&runner, {0, 0.5, 1});
+  MP_ASSERT_OK(runner.Run());
+
+  const auto& output_packets_ = runner.Outputs().Tag("CLASSIFICATIONS").packets;
+
+  EXPECT_EQ(1, output_packets_.size());
+
+  const auto& classification_list =
+      output_packets_[0].Get<ClassificationList>();
+
+  // Verify results are sorted by descending score.
+  EXPECT_EQ(3, classification_list.classification_size());
+  float score = std::numeric_limits<float>::max();
+  for (int i = 0; i < classification_list.classification_size(); ++i) {
+    EXPECT_LE(classification_list.classification(i).score(), score);
+    score = classification_list.classification(i).score();
+  }
+}
+
+TEST_F(TensorsToClassificationCalculatorTest,
+       ClassNameAllowlistWithLabelItems) {
+  mediapipe::CalculatorRunner runner(ParseTextProtoOrDie<Node>(R"pb(
+    calculator: "TensorsToClassificationCalculator"
+    input_stream: "TENSORS:tensors"
+    output_stream: "CLASSIFICATIONS:classifications"
+    options {
+      [mediapipe.TensorsToClassificationCalculatorOptions.ext] {
+        label_items {
+          key: 0
+          value { name: "ClassA" }
+        }
+        label_items {
+          key: 1
+          value { name: "ClassB" }
+        }
+        label_items {
+          key: 2
+          value { name: "ClassC" }
+        }
+        allow_classes: 1
+      }
+    }
+  )pb"));
+
+  BuildGraph(&runner, {0, 0.5, 1});
+  MP_ASSERT_OK(runner.Run());
+
+  const auto& output_packets_ = runner.Outputs().Tag("CLASSIFICATIONS").packets;
+
+  EXPECT_EQ(1, output_packets_.size());
+
+  const auto& classification_list =
+      output_packets_[0].Get<ClassificationList>();
+  EXPECT_EQ(1, classification_list.classification_size());
+  EXPECT_EQ(1, classification_list.classification(0).index());
+  EXPECT_EQ(0.5, classification_list.classification(0).score());
+  ASSERT_TRUE(classification_list.classification(0).has_label());
+}
+
+TEST_F(TensorsToClassificationCalculatorTest,
+       ClassNameIgnorelistWithLabelItems) {
+  mediapipe::CalculatorRunner runner(ParseTextProtoOrDie<Node>(R"pb(
+    calculator: "TensorsToClassificationCalculator"
+    input_stream: "TENSORS:tensors"
+    output_stream: "CLASSIFICATIONS:classifications"
+    options {
+      [mediapipe.TensorsToClassificationCalculatorOptions.ext] {
+        label_items {
+          key: 0
+          value { name: "ClassA" }
+        }
+        label_items {
+          key: 1
+          value { name: "ClassB" }
+        }
+        label_items {
+          key: 2
+          value { name: "ClassC" }
+        }
+        ignore_classes: 1
+      }
+    }
+  )pb"));
+
+  BuildGraph(&runner, {0, 0.5, 1});
+  MP_ASSERT_OK(runner.Run());
+
+  const auto& output_packets_ = runner.Outputs().Tag("CLASSIFICATIONS").packets;
+
+  EXPECT_EQ(1, output_packets_.size());
+
+  const auto& classification_list =
+      output_packets_[0].Get<ClassificationList>();
+  EXPECT_EQ(2, classification_list.classification_size());
+  EXPECT_EQ(0, classification_list.classification(0).index());
+  EXPECT_EQ(0, classification_list.classification(0).score());
+  ASSERT_TRUE(classification_list.classification(0).has_label());
+  EXPECT_EQ(2, classification_list.classification(1).index());
+  EXPECT_EQ(1, classification_list.classification(1).score());
+  ASSERT_TRUE(classification_list.classification(1).has_label());
+}
+
 }  // namespace mediapipe

mediapipe/calculators/tensor/tensors_to_detections_calculator.cc

@@ -91,6 +91,40 @@ void ConvertAnchorsToRawValues(const std::vector<Anchor>& anchors,
   }
 }
 
+absl::Status CheckCustomTensorMapping(
+    const TensorsToDetectionsCalculatorOptions::TensorMapping& tensor_mapping) {
+  RET_CHECK(tensor_mapping.has_detections_tensor_index() &&
+            tensor_mapping.has_scores_tensor_index());
+  int bitmap = 0;
+  bitmap |= 1 << tensor_mapping.detections_tensor_index();
+  bitmap |= 1 << tensor_mapping.scores_tensor_index();
+  if (!tensor_mapping.has_num_detections_tensor_index() &&
+      !tensor_mapping.has_classes_tensor_index() &&
+      !tensor_mapping.has_anchors_tensor_index()) {
+    // Only allows the output tensor index 0 and 1 to be occupied.
+    RET_CHECK_EQ(3, bitmap) << "The custom output tensor indices should only "
+                               "cover index 0 and 1.";
+  } else if (tensor_mapping.has_anchors_tensor_index()) {
+    RET_CHECK(!tensor_mapping.has_classes_tensor_index() &&
+              !tensor_mapping.has_num_detections_tensor_index());
+    bitmap |= 1 << tensor_mapping.anchors_tensor_index();
+    // If the"anchors" tensor will be available, only allows the output tensor
+    // index 0, 1, 2 to be occupied.
+    RET_CHECK_EQ(7, bitmap) << "The custom output tensor indices should only "
+                               "cover index 0, 1 and 2.";
+  } else {
+    RET_CHECK(tensor_mapping.has_classes_tensor_index() &&
+              tensor_mapping.has_num_detections_tensor_index());
+    // If the "classes" and the "number of detections" tensors will be
+    // available, only allows the output tensor index 0, 1, 2, 3 to be occupied.
+    bitmap |= 1 << tensor_mapping.classes_tensor_index();
+    bitmap |= 1 << tensor_mapping.num_detections_tensor_index();
+    RET_CHECK_EQ(15, bitmap) << "The custom output tensor indices should only "
+                                "cover index 0, 1, 2 and 3.";
+  }
+  return absl::OkStatus();
+}
+
 }  // namespace
 
 // Convert result Tensors from object detection models into MediaPipe
@@ -170,13 +204,27 @@ class TensorsToDetectionsCalculator : public Node {
   Detection ConvertToDetection(float box_ymin, float box_xmin, float box_ymax,
                                float box_xmax, float score, int class_id,
                                bool flip_vertically);
+  bool IsClassIndexAllowed(int class_index);
 
   int num_classes_ = 0;
   int num_boxes_ = 0;
   int num_coords_ = 0;
-  std::set<int> ignore_classes_;
+  int max_results_ = -1;
 
-  ::mediapipe::TensorsToDetectionsCalculatorOptions options_;
+  // Set of allowed or ignored class indices.
+  struct ClassIndexSet {
+    absl::flat_hash_set<int> values;
+    bool is_allowlist;
+  };
+  // Allowed or ignored class indices based on provided options or side packet.
+  // These are used to filter out the output detection results.
+  ClassIndexSet class_index_set_;
+
+  TensorsToDetectionsCalculatorOptions options_;
+  bool scores_tensor_index_is_set_ = false;
+  TensorsToDetectionsCalculatorOptions::TensorMapping tensor_mapping_;
+  std::vector<int> box_indices_ = {0, 1, 2, 3};
+  bool has_custom_box_indices_ = false;
   std::vector<Anchor> anchors_;
 
 #ifndef MEDIAPIPE_DISABLE_GL_COMPUTE
@@ -239,6 +287,21 @@ absl::Status TensorsToDetectionsCalculator::Process(CalculatorContext* cc) {
       }
     }
   }
+  const int num_input_tensors = kInTensors(cc)->size();
+  if (!scores_tensor_index_is_set_) {
+    if (num_input_tensors == 2 ||
+        num_input_tensors == kNumInputTensorsWithAnchors) {
+      tensor_mapping_.set_scores_tensor_index(1);
+    } else {
+      tensor_mapping_.set_scores_tensor_index(2);
+    }
+    scores_tensor_index_is_set_ = true;
+  }
+  if (gpu_processing || num_input_tensors != 4) {
+    // Allows custom bounding box indices when receiving 4 cpu tensors.
+    // Uses the default bbox indices in other cases.
+    RET_CHECK(!has_custom_box_indices_);
+  }
 
   if (gpu_processing) {
     if (!gpu_inited_) {
@@ -263,12 +326,15 @@ absl::Status TensorsToDetectionsCalculator::ProcessCPU(
     // Postprocessing on CPU for model without postprocessing op. E.g. output
     // raw score tensor and box tensor. Anchor decoding will be handled below.
     // TODO: Add flexible input tensor size handling.
-    auto raw_box_tensor = &input_tensors[0];
+    auto raw_box_tensor =
+        &input_tensors[tensor_mapping_.detections_tensor_index()];
     RET_CHECK_EQ(raw_box_tensor->shape().dims.size(), 3);
     RET_CHECK_EQ(raw_box_tensor->shape().dims[0], 1);
+    RET_CHECK_GT(num_boxes_, 0) << "Please set num_boxes in calculator options";
     RET_CHECK_EQ(raw_box_tensor->shape().dims[1], num_boxes_);
     RET_CHECK_EQ(raw_box_tensor->shape().dims[2], num_coords_);
-    auto raw_score_tensor = &input_tensors[1];
+    auto raw_score_tensor =
+        &input_tensors[tensor_mapping_.scores_tensor_index()];
     RET_CHECK_EQ(raw_score_tensor->shape().dims.size(), 3);
     RET_CHECK_EQ(raw_score_tensor->shape().dims[0], 1);
     RET_CHECK_EQ(raw_score_tensor->shape().dims[1], num_boxes_);
@@ -281,7 +347,8 @@ absl::Status TensorsToDetectionsCalculator::ProcessCPU(
     // TODO: Support other options to load anchors.
     if (!anchors_init_) {
       if (input_tensors.size() == kNumInputTensorsWithAnchors) {
-        auto anchor_tensor = &input_tensors[2];
+        auto anchor_tensor =
+            &input_tensors[tensor_mapping_.anchors_tensor_index()];
         RET_CHECK_EQ(anchor_tensor->shape().dims.size(), 2);
         RET_CHECK_EQ(anchor_tensor->shape().dims[0], num_boxes_);
         RET_CHECK_EQ(anchor_tensor->shape().dims[1], kNumCoordsPerBox);
@@ -307,7 +374,7 @@ absl::Status TensorsToDetectionsCalculator::ProcessCPU(
       float max_score = -std::numeric_limits<float>::max();
       // Find the top score for box i.
       for (int score_idx = 0; score_idx < num_classes_; ++score_idx) {
-        if (ignore_classes_.find(score_idx) == ignore_classes_.end()) {
+        if (IsClassIndexAllowed(score_idx)) {
           auto score = raw_scores[i * num_classes_ + score_idx];
           if (options_.sigmoid_score()) {
             if (options_.has_score_clipping_thresh()) {
@@ -337,23 +404,26 @@ absl::Status TensorsToDetectionsCalculator::ProcessCPU(
     // Postprocessing on CPU with postprocessing op (e.g. anchor decoding and
     // non-maximum suppression) within the model.
     RET_CHECK_EQ(input_tensors.size(), 4);
-
-    auto num_boxes_tensor = &input_tensors[3];
+    auto num_boxes_tensor =
+        &input_tensors[tensor_mapping_.num_detections_tensor_index()];
     RET_CHECK_EQ(num_boxes_tensor->shape().dims.size(), 1);
     RET_CHECK_EQ(num_boxes_tensor->shape().dims[0], 1);
 
-    auto detection_boxes_tensor = &input_tensors[0];
+    auto detection_boxes_tensor =
+        &input_tensors[tensor_mapping_.detections_tensor_index()];
     RET_CHECK_EQ(detection_boxes_tensor->shape().dims.size(), 3);
     RET_CHECK_EQ(detection_boxes_tensor->shape().dims[0], 1);
     const int max_detections = detection_boxes_tensor->shape().dims[1];
     RET_CHECK_EQ(detection_boxes_tensor->shape().dims[2], num_coords_);
 
-    auto detection_classes_tensor = &input_tensors[1];
+    auto detection_classes_tensor =
+        &input_tensors[tensor_mapping_.classes_tensor_index()];
     RET_CHECK_EQ(detection_classes_tensor->shape().dims.size(), 2);
     RET_CHECK_EQ(detection_classes_tensor->shape().dims[0], 1);
     RET_CHECK_EQ(detection_classes_tensor->shape().dims[1], max_detections);
 
-    auto detection_scores_tensor = &input_tensors[2];
+    auto detection_scores_tensor =
+        &input_tensors[tensor_mapping_.scores_tensor_index()];
     RET_CHECK_EQ(detection_scores_tensor->shape().dims.size(), 2);
     RET_CHECK_EQ(detection_scores_tensor->shape().dims[0], 1);
     RET_CHECK_EQ(detection_scores_tensor->shape().dims[1], max_detections);
@@ -385,6 +455,7 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
     CalculatorContext* cc, std::vector<Detection>* output_detections) {
   const auto& input_tensors = *kInTensors(cc);
   RET_CHECK_GE(input_tensors.size(), 2);
+  RET_CHECK_GT(num_boxes_, 0) << "Please set num_boxes in calculator options";
 #ifndef MEDIAPIPE_DISABLE_GL_COMPUTE
 
   MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext([this, &input_tensors, &cc,
@@ -392,12 +463,14 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
                                                     -> absl::Status {
     if (!anchors_init_) {
       if (input_tensors.size() == kNumInputTensorsWithAnchors) {
-        auto read_view = input_tensors[2].GetOpenGlBufferReadView();
+        auto read_view = input_tensors[tensor_mapping_.anchors_tensor_index()]
+                             .GetOpenGlBufferReadView();
         glBindBuffer(GL_COPY_READ_BUFFER, read_view.name());
         auto write_view = raw_anchors_buffer_->GetOpenGlBufferWriteView();
         glBindBuffer(GL_COPY_WRITE_BUFFER, write_view.name());
-        glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0,
-                            input_tensors[2].bytes());
+        glCopyBufferSubData(
+            GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0,
+            input_tensors[tensor_mapping_.anchors_tensor_index()].bytes());
       } else if (!kInAnchors(cc).IsEmpty()) {
         const auto& anchors = *kInAnchors(cc);
         auto anchors_view = raw_anchors_buffer_->GetCpuWriteView();
@@ -416,7 +489,9 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
       auto decoded_boxes_view =
           decoded_boxes_buffer_->GetOpenGlBufferWriteView();
       glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, decoded_boxes_view.name());
-      auto input0_view = input_tensors[0].GetOpenGlBufferReadView();
+      auto input0_view =
+          input_tensors[tensor_mapping_.detections_tensor_index()]
+              .GetOpenGlBufferReadView();
       glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, input0_view.name());
       auto raw_anchors_view = raw_anchors_buffer_->GetOpenGlBufferReadView();
       glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, raw_anchors_view.name());
@@ -425,7 +500,8 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
 
       // Score boxes.
       glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, scored_boxes_view.name());
-      auto input1_view = input_tensors[1].GetOpenGlBufferReadView();
+      auto input1_view = input_tensors[tensor_mapping_.scores_tensor_index()]
+                             .GetOpenGlBufferReadView();
       glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, input1_view.name());
       glUseProgram(score_program_);
       glDispatchCompute(num_boxes_, 1, 1);
@@ -457,7 +533,8 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
     if (input_tensors.size() == kNumInputTensorsWithAnchors) {
       RET_CHECK_EQ(input_tensors.size(), kNumInputTensorsWithAnchors);
       auto command_buffer = [gpu_helper_ commandBuffer];
-      auto src_buffer = input_tensors[2].GetMtlBufferReadView(command_buffer);
+      auto src_buffer = input_tensors[tensor_mapping_.anchors_tensor_index()]
+                            .GetMtlBufferReadView(command_buffer);
       auto dest_buffer =
           raw_anchors_buffer_->GetMtlBufferWriteView(command_buffer);
       id<MTLBlitCommandEncoder> blit_command =
@@ -466,7 +543,9 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
                       sourceOffset:0
                           toBuffer:dest_buffer.buffer()
                  destinationOffset:0
-                              size:input_tensors[2].bytes()];
+                              size:input_tensors[tensor_mapping_
+                                                     .anchors_tensor_index()]
+                                       .bytes()];
       [blit_command endEncoding];
       [command_buffer commit];
     } else if (!kInAnchors(cc).IsEmpty()) {
@@ -493,7 +572,8 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
     auto decoded_boxes_view =
         decoded_boxes_buffer_->GetMtlBufferWriteView(command_buffer);
     [command_encoder setBuffer:decoded_boxes_view.buffer() offset:0 atIndex:0];
-    auto input0_view = input_tensors[0].GetMtlBufferReadView(command_buffer);
+    auto input0_view = input_tensors[tensor_mapping_.detections_tensor_index()]
+                           .GetMtlBufferReadView(command_buffer);
     [command_encoder setBuffer:input0_view.buffer() offset:0 atIndex:1];
     auto raw_anchors_view =
         raw_anchors_buffer_->GetMtlBufferReadView(command_buffer);
@@ -505,7 +585,8 @@ absl::Status TensorsToDetectionsCalculator::ProcessGPU(
 
     [command_encoder setComputePipelineState:score_program_];
     [command_encoder setBuffer:scored_boxes_view.buffer() offset:0 atIndex:0];
-    auto input1_view = input_tensors[1].GetMtlBufferReadView(command_buffer);
+    auto input1_view = input_tensors[tensor_mapping_.scores_tensor_index()]
+                           .GetMtlBufferReadView(command_buffer);
     [command_encoder setBuffer:input1_view.buffer() offset:0 atIndex:1];
     MTLSize score_threads_per_group = MTLSizeMake(1, num_classes_, 1);
     MTLSize score_threadgroups = MTLSizeMake(num_boxes_, 1, 1);
@@ -563,12 +644,15 @@ absl::Status TensorsToDetectionsCalculator::LoadOptions(CalculatorContext* cc) {
   // Get calculator options specified in the graph.
   options_ = cc->Options<::mediapipe::TensorsToDetectionsCalculatorOptions>();
   RET_CHECK(options_.has_num_classes());
-  RET_CHECK(options_.has_num_boxes());
   RET_CHECK(options_.has_num_coords());
 
   num_classes_ = options_.num_classes();
   num_boxes_ = options_.num_boxes();
   num_coords_ = options_.num_coords();
+  CHECK_NE(options_.max_results(), 0)
+      << "The maximum number of the top-scored detection results must be "
+         "non-zero.";
+  max_results_ = options_.max_results();
 
   // Currently only support 2D when num_values_per_keypoint equals to 2.
   CHECK_EQ(options_.num_values_per_keypoint(), 2);
@@ -580,15 +664,55 @@ absl::Status TensorsToDetectionsCalculator::LoadOptions(CalculatorContext* cc) {
 
   if (kSideInIgnoreClasses(cc).IsConnected()) {
     RET_CHECK(!kSideInIgnoreClasses(cc).IsEmpty());
+    RET_CHECK(options_.allow_classes().empty());
+    class_index_set_.is_allowlist = false;
     for (int ignore_class : *kSideInIgnoreClasses(cc)) {
-      ignore_classes_.insert(ignore_class);
+      class_index_set_.values.insert(ignore_class);
+    }
+  } else if (!options_.allow_classes().empty()) {
+    RET_CHECK(options_.ignore_classes().empty());
+    class_index_set_.is_allowlist = true;
+    for (int i = 0; i < options_.allow_classes_size(); ++i) {
+      class_index_set_.values.insert(options_.allow_classes(i));
     }
   } else {
+    class_index_set_.is_allowlist = false;
     for (int i = 0; i < options_.ignore_classes_size(); ++i) {
-      ignore_classes_.insert(options_.ignore_classes(i));
+      class_index_set_.values.insert(options_.ignore_classes(i));
     }
   }
 
+  if (options_.has_tensor_mapping()) {
+    RET_CHECK_OK(CheckCustomTensorMapping(options_.tensor_mapping()));
+    tensor_mapping_ = options_.tensor_mapping();
+    scores_tensor_index_is_set_ = true;
+  } else {
+    // Assigns the default tensor indices.
+    tensor_mapping_.set_detections_tensor_index(0);
+    tensor_mapping_.set_classes_tensor_index(1);
+    tensor_mapping_.set_anchors_tensor_index(2);
+    tensor_mapping_.set_num_detections_tensor_index(3);
+    // The scores tensor index needs to be determined based on the number of
+    // model's output tensors, which will be available in the first invocation
+    // of the Process() method.
+    tensor_mapping_.set_scores_tensor_index(-1);
+    scores_tensor_index_is_set_ = false;
+  }
+
+  if (options_.has_box_boundaries_indices()) {
+    box_indices_ = {options_.box_boundaries_indices().ymin(),
+                    options_.box_boundaries_indices().xmin(),
+                    options_.box_boundaries_indices().ymax(),
+                    options_.box_boundaries_indices().xmax()};
+    int bitmap = 0;
+    for (int i : box_indices_) {
+      bitmap |= 1 << i;
+    }
+    RET_CHECK_EQ(bitmap, 15) << "The custom box boundaries indices should only "
+                                "cover index 0, 1, 2, and 3.";
+    has_custom_box_indices_ = true;
+  }
+
   return absl::OkStatus();
 }
 
@@ -660,14 +784,22 @@ absl::Status TensorsToDetectionsCalculator::ConvertToDetections(
     const float* detection_boxes, const float* detection_scores,
     const int* detection_classes, std::vector<Detection>* output_detections) {
   for (int i = 0; i < num_boxes_; ++i) {
+    if (max_results_ > 0 && output_detections->size() == max_results_) {
+      break;
+    }
     if (options_.has_min_score_thresh() &&
         detection_scores[i] < options_.min_score_thresh()) {
       continue;
     }
+    if (!IsClassIndexAllowed(detection_classes[i])) {
+      continue;
+    }
     const int box_offset = i * num_coords_;
     Detection detection = ConvertToDetection(
-        detection_boxes[box_offset + 0], detection_boxes[box_offset + 1],
-        detection_boxes[box_offset + 2], detection_boxes[box_offset + 3],
+        /*box_ymin=*/detection_boxes[box_offset + box_indices_[0]],
+        /*box_xmin=*/detection_boxes[box_offset + box_indices_[1]],
+        /*box_ymax=*/detection_boxes[box_offset + box_indices_[2]],
+        /*box_xmax=*/detection_boxes[box_offset + box_indices_[3]],
         detection_scores[i], detection_classes[i], options_.flip_vertically());
     const auto& bbox = detection.location_data().relative_bounding_box();
     if (bbox.width() < 0 || bbox.height() < 0 || std::isnan(bbox.width()) ||
@@ -909,7 +1041,7 @@ void main() {
         options_.has_score_clipping_thresh() ? 1 : 0,
         options_.has_score_clipping_thresh() ? options_.score_clipping_thresh()
                                              : 0,
-        !ignore_classes_.empty() ? 1 : 0);
+        !IsClassIndexAllowed(0));
 
     // # filter classes supported is hardware dependent.
     int max_wg_size;  //  typically <= 1024
@@ -918,7 +1050,14 @@ void main() {
     CHECK_LT(num_classes_, max_wg_size)
         << "# classes must be < " << max_wg_size;
     // TODO support better filtering.
-    CHECK_LE(ignore_classes_.size(), 1) << "Only ignore class 0 is allowed";
+    if (class_index_set_.is_allowlist) {
+      CHECK_EQ(class_index_set_.values.size(),
+               IsClassIndexAllowed(0) ? num_classes_ : num_classes_ - 1)
+          << "Only all classes  >= class 0  or  >= class 1";
+    } else {
+      CHECK_EQ(class_index_set_.values.size(), IsClassIndexAllowed(0) ? 0 : 1)
+          << "Only ignore class 0 is allowed";
+    }
 
     // Shader program
     {
@@ -1125,10 +1264,17 @@ kernel void scoreKernel(
       options_.has_score_clipping_thresh() ? 1 : 0,
       options_.has_score_clipping_thresh() ? options_.score_clipping_thresh()
                                            : 0,
-      ignore_classes_.size() ? 1 : 0);
+      !IsClassIndexAllowed(0));
 
   // TODO support better filtering.
-  CHECK_LE(ignore_classes_.size(), 1) << "Only ignore class 0 is allowed";
+  if (class_index_set_.is_allowlist) {
+    CHECK_EQ(class_index_set_.values.size(),
+             IsClassIndexAllowed(0) ? num_classes_ : num_classes_ - 1)
+        << "Only all classes  >= class 0  or  >= class 1";
+  } else {
+    CHECK_EQ(class_index_set_.values.size(), IsClassIndexAllowed(0) ? 0 : 1)
+        << "Only ignore class 0 is allowed";
+  }
 
   {
     // Shader program
@@ -1160,5 +1306,16 @@ kernel void scoreKernel(
   return absl::OkStatus();
 }
 
+bool TensorsToDetectionsCalculator::IsClassIndexAllowed(int class_index) {
+  if (class_index_set_.values.empty()) {
+    return true;
+  }
+  if (class_index_set_.is_allowlist) {
+    return class_index_set_.values.contains(class_index);
+  } else {
+    return !class_index_set_.values.contains(class_index);
+  }
+}
+
 }  // namespace api2
 }  // namespace mediapipe

mediapipe/calculators/tensor/tensors_to_detections_calculator.proto

@@ -57,7 +57,12 @@ message TensorsToDetectionsCalculatorOptions {
   optional bool reverse_output_order = 14 [default = false];
   // The ids of classes that should be ignored during decoding the score for
   // each predicted box. Can be overridden with IGNORE_CLASSES side packet.
+  // `ignore_classes` and `allow_classes` are mutually exclusive.
   repeated int32 ignore_classes = 8;
+  // The ids of classes that should be allowed during decoding the score for
+  // each predicted box. `ignore_classes` and `allow_classes` are mutually
+  // exclusive.
+  repeated int32 allow_classes = 21 [packed = true];
 
   optional bool sigmoid_score = 15 [default = false];
   optional float score_clipping_thresh = 16;
@@ -71,4 +76,40 @@ message TensorsToDetectionsCalculatorOptions {
 
   // Score threshold for perserving decoded detections.
   optional float min_score_thresh = 19;
+
+  // The maximum number of the detection results to return. If < 0, all
+  // available results will be returned.
+  // For the detection models that have built-in non max suppression op, the
+  // output detections are the top-scored results. Otherwise, the output
+  // detections are the first N results that have higher scores than
+  // `min_score_thresh`.
+  optional int32 max_results = 20 [default = -1];
+
+  // The custom model output tensor mapping.
+  // The indices of the "detections" tensor and the "scores" tensor are always
+  // required. If the model outputs an "anchors" tensor, `anchors_tensor_index`
+  // must be specified. If the model outputs both "classes" tensor and "number
+  // of detections" tensors, `classes_tensor_index` and
+  // `num_detections_tensor_index` must be set.
+  message TensorMapping {
+    optional int32 detections_tensor_index = 1;
+    optional int32 classes_tensor_index = 2;
+    optional int32 scores_tensor_index = 3;
+    optional int32 num_detections_tensor_index = 4;
+    optional int32 anchors_tensor_index = 5;
+  }
+  optional TensorMapping tensor_mapping = 22;
+
+  // Represents the bounding box by using the combination of boundaries,
+  // {ymin, xmin, ymax, xmax}.
+  // The default order is {ymin, xmin, ymax, xmax}.
+  message BoxBoundariesIndices {
+    optional int32 ymin = 1 [default = 0];
+    optional int32 xmin = 2 [default = 1];
+    optional int32 ymax = 3 [default = 2];
+    optional int32 xmax = 4 [default = 3];
+  }
+  oneof box_indices {
+    BoxBoundariesIndices box_boundaries_indices = 23;
+  }
 }

mediapipe/calculators/tensor/tensors_to_segmentation_calculator.cc

@@ -20,10 +20,8 @@
 #include "mediapipe/framework/calculator_context.h"
 #include "mediapipe/framework/calculator_framework.h"
 #include "mediapipe/framework/formats/image.h"
-#include "mediapipe/framework/formats/image_opencv.h"
 #include "mediapipe/framework/formats/tensor.h"
 #include "mediapipe/framework/port.h"
-#include "mediapipe/framework/port/opencv_imgproc_inc.h"
 #include "mediapipe/framework/port/ret_check.h"
 #include "mediapipe/framework/port/statusor.h"
 #include "mediapipe/gpu/gpu_origin.pb.h"
@@ -37,6 +35,11 @@
 #include "mediapipe/gpu/shader_util.h"
 #endif  // !MEDIAPIPE_DISABLE_GPU
 
+#if !MEDIAPIPE_DISABLE_OPENCV
+#include "mediapipe/framework/formats/image_opencv.h"
+#include "mediapipe/framework/port/opencv_imgproc_inc.h"
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
+
 #if MEDIAPIPE_OPENGL_ES_VERSION >= MEDIAPIPE_OPENGL_ES_31
 #include "tensorflow/lite/delegates/gpu/gl/converters/util.h"
 #include "tensorflow/lite/delegates/gpu/gl/gl_program.h"
@@ -159,9 +162,10 @@ class TensorsToSegmentationCalculator : public CalculatorBase {
     return options_.gpu_origin() != mediapipe::GpuOrigin_Mode_TOP_LEFT;
   }
 
+#if !MEDIAPIPE_DISABLE_OPENCV
   template <class T>
   absl::Status ApplyActivation(cv::Mat& tensor_mat, cv::Mat* small_mask_mat);
-
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
   ::mediapipe::TensorsToSegmentationCalculatorOptions options_;
 
 #if !MEDIAPIPE_DISABLE_GPU
@@ -283,7 +287,11 @@ absl::Status TensorsToSegmentationCalculator::Process(CalculatorContext* cc) {
     RET_CHECK_FAIL() << "GPU processing disabled.";
 #endif  // !MEDIAPIPE_DISABLE_GPU
   } else {
+#if !MEDIAPIPE_DISABLE_OPENCV
     MP_RETURN_IF_ERROR(ProcessCpu(cc));
+#else
+    RET_CHECK_FAIL() << "OpenCV processing disabled.";
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
   }
 
   return absl::OkStatus();
@@ -311,6 +319,7 @@ absl::Status TensorsToSegmentationCalculator::Close(CalculatorContext* cc) {
 
 absl::Status TensorsToSegmentationCalculator::ProcessCpu(
     CalculatorContext* cc) {
+#if !MEDIAPIPE_DISABLE_OPENCV
   // Get input streams, and dimensions.
   const auto& input_tensors =
       cc->Inputs().Tag(kTensorsTag).Get<std::vector<Tensor>>();
@@ -355,14 +364,17 @@ absl::Status TensorsToSegmentationCalculator::ProcessCpu(
   std::shared_ptr<ImageFrame> mask_frame = std::make_shared<ImageFrame>(
       ImageFormat::VEC32F1, output_width, output_height);
   std::unique_ptr<Image> output_mask = absl::make_unique<Image>(mask_frame);
-  cv::Mat output_mat = formats::MatView(output_mask.get());
+  auto output_mat = formats::MatView(output_mask.get());
   // Upsample small mask into output.
-  cv::resize(small_mask_mat, output_mat, cv::Size(output_width, output_height));
+  cv::resize(small_mask_mat, *output_mat,
+             cv::Size(output_width, output_height));
   cc->Outputs().Tag(kMaskTag).Add(output_mask.release(), cc->InputTimestamp());
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 
   return absl::OkStatus();
 }
 
+#if !MEDIAPIPE_DISABLE_OPENCV
 template <class T>
 absl::Status TensorsToSegmentationCalculator::ApplyActivation(
     cv::Mat& tensor_mat, cv::Mat* small_mask_mat) {
@@ -410,6 +422,7 @@ absl::Status TensorsToSegmentationCalculator::ApplyActivation(
 
   return absl::OkStatus();
 }
+#endif  // !MEDIAPIPE_DISABLE_OPENCV
 
 // Steps:
 // 1. receive tensor

mediapipe/calculators/tensorflow/BUILD

@@ -334,6 +334,7 @@ cc_library(
         ":image_frame_to_tensor_calculator_cc_proto",
         "//mediapipe/framework:calculator_framework",
         "//mediapipe/framework/formats:image_frame",
+        "//mediapipe/framework/port:core_proto",
         "//mediapipe/framework/port:ret_check",
         "//mediapipe/framework/port:status",
     ] + select({

mediapipe/calculators/tensorflow/image_frame_to_tensor_calculator.cc

@@ -17,6 +17,7 @@
 #include "mediapipe/calculators/tensorflow/image_frame_to_tensor_calculator.pb.h"
 #include "mediapipe/framework/calculator_framework.h"
 #include "mediapipe/framework/formats/image_frame.h"
+#include "mediapipe/framework/port/proto_ns.h"
 #include "mediapipe/framework/port/ret_check.h"
 #include "mediapipe/framework/port/status.h"
 #include "mediapipe/framework/port/status_macros.h"
@@ -32,7 +33,10 @@ namespace {
 // Convert the ImageFrame into Tensor with floating point value type.
 // The value will be normalized based on mean and stddev.
 std::unique_ptr<tf::Tensor> ImageFrameToNormalizedTensor(
-    const ImageFrame& image_frame, float mean, float stddev) {
+    // const ImageFrame& image_frame, float mean, float stddev) {
+    const ImageFrame& image_frame,
+    const mediapipe::proto_ns::RepeatedField<float>& mean,
+    const mediapipe::proto_ns::RepeatedField<float>& stddev) {
   const int cols = image_frame.Width();
   const int rows = image_frame.Height();
   const int channels = image_frame.NumberOfChannels();
@@ -45,7 +49,20 @@ std::unique_ptr<tf::Tensor> ImageFrameToNormalizedTensor(
   for (int row = 0; row < rows; ++row) {
     for (int col = 0; col < cols; ++col) {
       for (int channel = 0; channel < channels; ++channel) {
-        tensor_data(row, col, channel) = (pixel[channel] - mean) / stddev;
+        float mean_value = 0;
+        if (mean.size() > 1) {
+          mean_value = mean[channel];
+        } else if (!mean.empty()) {
+          mean_value = mean[0];
+        }
+        float stddev_value = 1;
+        if (stddev.size() > 1) {
+          stddev_value = stddev[channel];
+        } else if (!stddev.empty()) {
+          stddev_value = stddev[0];
+        }
+        tensor_data(row, col, channel) =
+            (pixel[channel] - mean_value) / stddev_value;
       }
       pixel += channels;
     }
@@ -126,7 +143,18 @@ absl::Status ImageFrameToTensorCalculator::Process(CalculatorContext* cc) {
     const tf::DataType data_type = options_.data_type();
     RET_CHECK_EQ(data_type, tf::DT_FLOAT)
         << "Unsupported data type " << data_type;
-    RET_CHECK_GT(options_.stddev(), 0.0f);
+    RET_CHECK_GT(options_.stddev().size(), 0) << "You must set a stddev.";
+    RET_CHECK_GT(options_.stddev()[0], 0.0f) << "The stddev cannot be zero.";
+    if (options_.stddev().size() > 1) {
+      RET_CHECK_EQ(options_.stddev().size(), video_frame.NumberOfChannels())
+          << "If specifying multiple stddev normalization values, "
+          << "the number must match the number of image channels.";
+    }
+    if (options_.mean().size() > 1) {
+      RET_CHECK_EQ(options_.mean().size(), video_frame.NumberOfChannels())
+          << "If specifying multiple mean normalization values, "
+          << "the number must match the number of image channels.";
+    }
     tensor = ImageFrameToNormalizedTensor(video_frame, options_.mean(),
                                           options_.stddev());
   } else {

mediapipe/calculators/tensorflow/image_frame_to_tensor_calculator.proto

@@ -32,6 +32,6 @@ message ImageFrameToTensorCalculatorOptions {
   // If set, the output tensor T is equal to (F - mean * J) / stddev, where F
   // and J are the input image frame and the all-ones matrix of the same size,
   // respectively.  Otherwise, T is equal to F.
-  optional float mean = 2;
-  optional float stddev = 3;
+  repeated float mean = 2;
+  repeated float stddev = 3;
 }

mediapipe/calculators/tensorflow/image_frame_to_tensor_calculator_test.cc

@@ -454,4 +454,32 @@ TEST_F(ImageFrameToTensorCalculatorTest, FixedRGBFrameWithMeanAndStddev) {
   EXPECT_EQ(actual[2], 127.0f / 128.0f);  // (255 - 128) / 128
 }
 
+TEST_F(ImageFrameToTensorCalculatorTest, FixedRGBFrameWithRepeatMeanAndStddev) {
+  runner_ = ::absl::make_unique<CalculatorRunner>(
+      "ImageFrameToTensorCalculator",
+      "[mediapipe.ImageFrameToTensorCalculatorOptions.ext]"
+      "{data_type:DT_FLOAT mean:128.0 mean:128.0 mean:128.0 "
+      " stddev:128.0 stddev:128.0 stddev:128.0}",
+      1, 1, 0);
+
+  // Create a single pixel image of fixed color #0080ff.
+  auto image_frame = ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, 1, 1);
+  const uint8 color[] = {0, 128, 255};
+  SetToColor<uint8>(color, image_frame.get());
+
+  runner_->MutableInputs()->Index(0).packets.push_back(
+      Adopt(image_frame.release()).At(Timestamp(0)));
+  MP_ASSERT_OK(runner_->Run());
+
+  const auto& tensor = runner_->Outputs().Index(0).packets[0].Get<tf::Tensor>();
+  EXPECT_EQ(tensor.dtype(), tf::DT_FLOAT);
+  ASSERT_EQ(tensor.dims(), 3);
+  EXPECT_EQ(tensor.shape().dim_size(0), 1);
+  EXPECT_EQ(tensor.shape().dim_size(1), 1);
+  EXPECT_EQ(tensor.shape().dim_size(2), 3);
+  const float* actual = tensor.flat<float>().data();
+  EXPECT_EQ(actual[0], -1.0f);            // (  0 - 128) / 128
+  EXPECT_EQ(actual[1], 0.0f);             // (128 - 128) / 128
+  EXPECT_EQ(actual[2], 127.0f / 128.0f);  // (255 - 128) / 128
+}
 }  // namespace mediapipe