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PiperOrigin-RevId: 263889205

mediapipe/objc/MPPInputSource.h

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+// 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.
+
+#import <AVFoundation/AVFoundation.h>
+#import <Foundation/Foundation.h>
+
+@class MPPInputSource;
+
+/// A delegate that can receive frames from a source.
+@protocol MPPInputSourceDelegate <NSObject>
+
+/// Provides the delegate with a new video frame.
+@optional
+- (void)processVideoFrame:(CVPixelBufferRef)imageBuffer
+               fromSource:(MPPInputSource*)source __deprecated;
+
+/// Provides the delegate with a new video frame.
+@optional
+- (void)processVideoFrame:(CVPixelBufferRef)imageBuffer
+                timestamp:(CMTime)timestamp
+               fromSource:(MPPInputSource*)source;
+
+// Provides the delegate with a new depth frame data
+@optional
+- (void)processDepthData:(AVDepthData*)depthData
+               timestamp:(CMTime)timestamp
+              fromSource:(MPPInputSource*)source;
+
+@optional
+- (void)videoDidPlayToEnd:(CMTime)timestamp;
+
+@end
+
+/// Abstract class for a video source.
+@interface MPPInputSource : NSObject
+
+/// The delegate that receives the frames.
+@property(weak, nonatomic, readonly) id<MPPInputSourceDelegate> delegate;
+
+/// The dispatch queue on which to schedule the delegate callback.
+@property(nonatomic, readonly) dispatch_queue_t delegateQueue;
+
+/// Whether the source is currently running.
+@property(nonatomic, getter=isRunning, readonly) BOOL running;
+
+/// Sets the delegate and the queue on which its callback should be invoked.
+- (void)setDelegate:(id<MPPInputSourceDelegate>)delegate queue:(dispatch_queue_t)queue;
+
+/// CoreVideo pixel format for the video frames. Defaults to
+/// kCVPixelFormatType_32BGRA.
+@property(nonatomic) OSType pixelFormatType;
+
+/// Starts the source.
+- (void)start;
+
+/// Stops the source.
+- (void)stop;
+
+@end