# MediaPipe graph that applies a face effect to the input video stream.

# GPU buffer. (GpuBuffer)
input_stream: "input_video"

# Boolean flag, which indicates whether the Facepaint effect is selected. (bool)
#
# If `true`, the Facepaint effect will be rendered.
# If `false`, the Glasses effect will be rendered.
input_stream: "is_facepaint_effect_selected"

# Output image with rendered results. (GpuBuffer)
output_stream: "output_video"

# A list of geometry data for a single detected face.
#
# NOTE: there will not be an output packet in this stream for this particular
# timestamp if none of faces detected.
#
# (std::vector<face_geometry::FaceGeometry>)
output_stream: "multi_face_geometry"

# Throttles the images flowing downstream for flow control. It passes through
# the very first incoming image unaltered, and waits for downstream nodes
# (calculators and subgraphs) in the graph to finish their tasks before it
# passes through another image. All images that come in while waiting are
# dropped, limiting the number of in-flight images in most part of the graph to
# 1. This prevents the downstream nodes from queuing up incoming images and data
# excessively, which leads to increased latency and memory usage, unwanted in
# real-time mobile applications. It also eliminates unnecessarily computation,
# e.g., the output produced by a node may get dropped downstream if the
# subsequent nodes are still busy processing previous inputs.
node {
  calculator: "FlowLimiterCalculator"
  input_stream: "input_video"
  input_stream: "FINISHED:output_video"
  input_stream_info: {
    tag_index: "FINISHED"
    back_edge: true
  }
  output_stream: "throttled_input_video"
}

# Generates an environment that describes the current virtual scene.
node {
  calculator: "FaceGeometryEnvGeneratorCalculator"
  output_side_packet: "ENVIRONMENT:environment"
  node_options: {
    [type.googleapis.com/mediapipe.FaceGeometryEnvGeneratorCalculatorOptions] {
      environment: {
        origin_point_location: TOP_LEFT_CORNER
        perspective_camera: {
          vertical_fov_degrees: 63.0  # 63 degrees
          near: 1.0  # 1cm
          far: 10000.0  # 100m
        }
      }
    }
  }
}

# Subgraph that detects a single face and corresponding landmarks. The landmarks
# are also "smoothed" to achieve better visual results.
node {
  calculator: "SingleFaceSmoothLandmarkGpu"
  input_stream: "IMAGE:throttled_input_video"
  output_stream: "LANDMARKS:multi_face_landmarks"
}

# Extracts the throttled input video frame dimensions as a separate packet.
node {
  calculator: "ImagePropertiesCalculator"
  input_stream: "IMAGE_GPU:throttled_input_video"
  output_stream: "SIZE:input_video_size"
}

# Subgraph that computes face geometry from landmarks for a single face.
node {
  calculator: "FaceGeometry"
  input_stream: "MULTI_FACE_LANDMARKS:multi_face_landmarks"
  input_stream: "IMAGE_SIZE:input_video_size"
  input_side_packet: "ENVIRONMENT:environment"
  output_stream: "MULTI_FACE_GEOMETRY:multi_face_geometry"
}

# Decides whether to render the Facepaint effect based on the
# `is_facepaint_effect_selected` flag value.
node {
  calculator: "GateCalculator"
  input_stream: "throttled_input_video"
  input_stream: "multi_face_geometry"
  input_stream: "ALLOW:is_facepaint_effect_selected"
  output_stream: "facepaint_effect_throttled_input_video"
  output_stream: "facepaint_effect_multi_face_geometry"
}

# Renders the Facepaint effect.
node {
  calculator: "FaceGeometryEffectRendererCalculator"
  input_side_packet: "ENVIRONMENT:environment"
  input_stream: "IMAGE_GPU:facepaint_effect_throttled_input_video"
  input_stream: "MULTI_FACE_GEOMETRY:facepaint_effect_multi_face_geometry"
  output_stream: "IMAGE_GPU:facepaint_effect_output_video"
  node_options: {
    [type.googleapis.com/mediapipe.FaceGeometryEffectRendererCalculatorOptions] {
      effect_texture_path: "mediapipe/graphs/face_effect/data/facepaint.pngblob"
    }
  }
}

# Decides whether to render the Glasses effect based on the
# `is_facepaint_effect_selected` flag value.
node {
  calculator: "GateCalculator"
  input_stream: "throttled_input_video"
  input_stream: "multi_face_geometry"
  input_stream: "DISALLOW:is_facepaint_effect_selected"
  output_stream: "glasses_effect_throttled_input_video"
  output_stream: "glasses_effect_multi_face_geometry"
}

# Renders the Glasses effect.
node {
  calculator: "FaceGeometryEffectRendererCalculator"
  input_side_packet: "ENVIRONMENT:environment"
  input_stream: "IMAGE_GPU:glasses_effect_throttled_input_video"
  input_stream: "MULTI_FACE_GEOMETRY:glasses_effect_multi_face_geometry"
  output_stream: "IMAGE_GPU:glasses_effect_output_video"
  node_options: {
    [type.googleapis.com/mediapipe.FaceGeometryEffectRendererCalculatorOptions] {
      effect_texture_path: "mediapipe/graphs/face_effect/data/glasses.pngblob"
      effect_mesh_3d_path: "mediapipe/graphs/face_effect/data/glasses.binarypb"
    }
  }
}

# Decides which of the Facepaint or the Glasses rendered results should be sent
# as the output GPU frame.
node {
  calculator: "ImmediateMuxCalculator"
  input_stream: "facepaint_effect_output_video"
  input_stream: "glasses_effect_output_video"
  output_stream: "output_video"
}