77 lines
2.7 KiB
Java
77 lines
2.7 KiB
Java
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/*
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* Copyright 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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package org.webrtc;
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import androidx.annotation.Nullable;
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/**
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* Lightweight abstraction for an object that can receive video frames, process them, and pass them
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* on to another object. This object is also allowed to observe capturer start/stop.
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*/
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public interface VideoProcessor extends CapturerObserver {
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public static class FrameAdaptationParameters {
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public final int cropX;
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public final int cropY;
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public final int cropWidth;
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public final int cropHeight;
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public final int scaleWidth;
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public final int scaleHeight;
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public final long timestampNs;
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public final boolean drop;
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public FrameAdaptationParameters(int cropX, int cropY, int cropWidth, int cropHeight,
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int scaleWidth, int scaleHeight, long timestampNs, boolean drop) {
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this.cropX = cropX;
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this.cropY = cropY;
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this.cropWidth = cropWidth;
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this.cropHeight = cropHeight;
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this.scaleWidth = scaleWidth;
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this.scaleHeight = scaleHeight;
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this.timestampNs = timestampNs;
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this.drop = drop;
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}
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}
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/**
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* This is a chance to access an unadapted frame. The default implementation applies the
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* adaptation and forwards the frame to {@link #onFrameCaptured(VideoFrame)}.
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*/
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default void onFrameCaptured(VideoFrame frame, FrameAdaptationParameters parameters) {
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VideoFrame adaptedFrame = applyFrameAdaptationParameters(frame, parameters);
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if (adaptedFrame != null) {
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onFrameCaptured(adaptedFrame);
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adaptedFrame.release();
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}
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}
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/**
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* Set the sink that receives the output from this processor. Null can be passed in to unregister
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* a sink.
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*/
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void setSink(@Nullable VideoSink sink);
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/**
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* Applies the frame adaptation parameters to a frame. Returns null if the frame is meant to be
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* dropped. Returns a new frame. The caller is responsible for releasing the returned frame.
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*/
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public static @Nullable VideoFrame applyFrameAdaptationParameters(
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VideoFrame frame, FrameAdaptationParameters parameters) {
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if (parameters.drop) {
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return null;
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}
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final VideoFrame.Buffer adaptedBuffer =
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frame.getBuffer().cropAndScale(parameters.cropX, parameters.cropY, parameters.cropWidth,
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parameters.cropHeight, parameters.scaleWidth, parameters.scaleHeight);
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return new VideoFrame(adaptedBuffer, frame.getRotation(), parameters.timestampNs);
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}
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}
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