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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.
*/
package androidx.media.filterfw.decoder;
import android.annotation.TargetApi;
import android.graphics.SurfaceTexture;
import android.graphics.SurfaceTexture.OnFrameAvailableListener;
import android.media.MediaCodec;
import android.media.MediaCodec.BufferInfo;
import android.media.MediaFormat;
import android.view.Surface;
import androidx.media.filterfw.FrameImage2D;
import androidx.media.filterfw.ImageShader;
import androidx.media.filterfw.TextureSource;
import java.nio.ByteBuffer;
/**
* {@link TrackDecoder} that decodes a video track and renders the frames onto a
* {@link SurfaceTexture}.
*
* This implementation uses the GPU for image operations such as copying
* and color-space conversion.
*/
@TargetApi(16)
public class GpuVideoTrackDecoder extends VideoTrackDecoder {
/**
* Identity fragment shader for external textures.
*/
private static final String COPY_FRAGMENT_SHADER =
"#extension GL_OES_EGL_image_external : require\n" +
"precision mediump float;\n" +
"uniform samplerExternalOES tex_sampler_0;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" gl_FragColor = texture2D(tex_sampler_0, v_texcoord);\n" +
"}\n";
private final TextureSource mTextureSource;
private final SurfaceTexture mSurfaceTexture; // Access guarded by mFrameMonitor.
private final float[] mTransformMatrix;
private final int mOutputWidth;
private final int mOutputHeight;
private ImageShader mImageShader;
private long mCurrentPresentationTimeUs;
public GpuVideoTrackDecoder(
int trackIndex, MediaFormat format, Listener listener) {
super(trackIndex, format, listener);
// Create a surface texture to be used by the video track decoder.
mTextureSource = TextureSource.newExternalTexture();
mSurfaceTexture = new SurfaceTexture(mTextureSource.getTextureId());
mSurfaceTexture.detachFromGLContext();
mSurfaceTexture.setOnFrameAvailableListener(new OnFrameAvailableListener() {
@Override
public void onFrameAvailable(SurfaceTexture surfaceTexture) {
markFrameAvailable();
}
});
mOutputWidth = format.getInteger(MediaFormat.KEY_WIDTH);
mOutputHeight = format.getInteger(MediaFormat.KEY_HEIGHT);
mTransformMatrix = new float[16];
}
@Override
protected MediaCodec initMediaCodec(MediaFormat format) {
Surface surface = new Surface(mSurfaceTexture);
MediaCodec mediaCodec = MediaCodec.createDecoderByType(
format.getString(MediaFormat.KEY_MIME));
mediaCodec.configure(format, surface, null, 0);
surface.release();
return mediaCodec;
}
@Override
protected boolean onDataAvailable(
MediaCodec codec, ByteBuffer[] buffers, int bufferIndex, BufferInfo info) {
boolean textureAvailable = waitForFrameGrab();
mCurrentPresentationTimeUs = info.presentationTimeUs;
// Only render the next frame if we weren't interrupted.
codec.releaseOutputBuffer(bufferIndex, textureAvailable);
if (textureAvailable) {
if (updateTexture()) {
notifyListener();
}
}
return false;
}
/**
* Waits for the texture's {@link OnFrameAvailableListener} to be notified and then updates
* the internal {@link SurfaceTexture}.
*/
private boolean updateTexture() {
// Wait for the frame we just released to appear in the texture.
synchronized (mFrameMonitor) {
try {
while (!mFrameAvailable) {
mFrameMonitor.wait();
}
mSurfaceTexture.attachToGLContext(mTextureSource.getTextureId());
mSurfaceTexture.updateTexImage();
mSurfaceTexture.detachFromGLContext();
return true;
} catch (InterruptedException e) {
return false;
}
}
}
@Override
protected void copyFrameDataTo(FrameImage2D outputVideoFrame, int rotation) {
TextureSource targetTexture = TextureSource.newExternalTexture();
mSurfaceTexture.attachToGLContext(targetTexture.getTextureId());
mSurfaceTexture.getTransformMatrix(mTransformMatrix);
ImageShader imageShader = getImageShader();
imageShader.setSourceTransform(mTransformMatrix);
int outputWidth = mOutputWidth;
int outputHeight = mOutputHeight;
if (rotation != 0) {
float[] targetCoords = getRotationCoords(rotation);
imageShader.setTargetCoords(targetCoords);
if (needSwapDimension(rotation)) {
outputWidth = mOutputHeight;
outputHeight = mOutputWidth;
}
}
outputVideoFrame.resize(new int[] { outputWidth, outputHeight });
imageShader.process(
targetTexture,
outputVideoFrame.lockRenderTarget(),
outputWidth,
outputHeight);
outputVideoFrame.setTimestamp(mCurrentPresentationTimeUs * 1000);
outputVideoFrame.unlock();
targetTexture.release();
mSurfaceTexture.detachFromGLContext();
}
@Override
public void release() {
super.release();
synchronized (mFrameMonitor) {
mTextureSource.release();
mSurfaceTexture.release();
}
}
/*
* This method has to be called on the MFF processing thread.
*/
private ImageShader getImageShader() {
if (mImageShader == null) {
mImageShader = new ImageShader(COPY_FRAGMENT_SHADER);
mImageShader.setTargetRect(0f, 1f, 1f, -1f);
}
return mImageShader;
}
/**
* Get the quad coords for rotation.
* @param rotation applied to the frame, value is one of
* {ROTATE_NONE, ROTATE_90_RIGHT, ROTATE_180, ROTATE_90_LEFT}
* @return coords the calculated quad coords for the given rotation
*/
private static float[] getRotationCoords(int rotation) {
switch(rotation) {
case MediaDecoder.ROTATE_90_RIGHT:
return new float[] { 0f, 0f, 0f, 1f, 1f, 0f, 1f, 1f };
case MediaDecoder.ROTATE_180:
return new float[] { 1f, 0f, 0f, 0f, 1f, 1f, 0f, 1f };
case MediaDecoder.ROTATE_90_LEFT:
return new float[] { 1f, 1f, 1f, 0f, 0f, 1f, 0f, 0f };
case MediaDecoder.ROTATE_NONE:
return new float[] { 0f, 1f, 1f, 1f, 0f, 0f, 1f, 0f };
default:
throw new IllegalArgumentException("Unsupported rotation angle.");
}
}
}
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