Benjamin Hendricks | 227b476 | 2013-09-19 14:40:45 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package androidx.media.filterfw.decoder; |
| 18 | |
| 19 | import android.annotation.TargetApi; |
| 20 | import android.graphics.SurfaceTexture; |
| 21 | import android.graphics.SurfaceTexture.OnFrameAvailableListener; |
| 22 | import android.media.MediaCodec; |
| 23 | import android.media.MediaCodec.BufferInfo; |
| 24 | import android.media.MediaFormat; |
| 25 | import android.view.Surface; |
| 26 | |
| 27 | import androidx.media.filterfw.FrameImage2D; |
| 28 | import androidx.media.filterfw.ImageShader; |
| 29 | import androidx.media.filterfw.TextureSource; |
| 30 | |
| 31 | import java.nio.ByteBuffer; |
| 32 | |
| 33 | /** |
| 34 | * {@link TrackDecoder} that decodes a video track and renders the frames onto a |
| 35 | * {@link SurfaceTexture}. |
| 36 | * |
| 37 | * This implementation uses the GPU for image operations such as copying |
| 38 | * and color-space conversion. |
| 39 | */ |
| 40 | @TargetApi(16) |
| 41 | public class GpuVideoTrackDecoder extends VideoTrackDecoder { |
| 42 | |
| 43 | /** |
| 44 | * Identity fragment shader for external textures. |
| 45 | */ |
| 46 | private static final String COPY_FRAGMENT_SHADER = |
| 47 | "#extension GL_OES_EGL_image_external : require\n" + |
| 48 | "precision mediump float;\n" + |
| 49 | "uniform samplerExternalOES tex_sampler_0;\n" + |
| 50 | "varying vec2 v_texcoord;\n" + |
| 51 | "void main() {\n" + |
| 52 | " gl_FragColor = texture2D(tex_sampler_0, v_texcoord);\n" + |
| 53 | "}\n"; |
| 54 | |
| 55 | private final TextureSource mTextureSource; |
| 56 | private final SurfaceTexture mSurfaceTexture; // Access guarded by mFrameMonitor. |
| 57 | private final float[] mTransformMatrix; |
| 58 | |
| 59 | private final int mOutputWidth; |
| 60 | private final int mOutputHeight; |
| 61 | |
| 62 | private ImageShader mImageShader; |
| 63 | |
| 64 | private long mCurrentPresentationTimeUs; |
| 65 | |
| 66 | public GpuVideoTrackDecoder( |
| 67 | int trackIndex, MediaFormat format, Listener listener) { |
| 68 | super(trackIndex, format, listener); |
| 69 | |
| 70 | // Create a surface texture to be used by the video track decoder. |
| 71 | mTextureSource = TextureSource.newExternalTexture(); |
| 72 | mSurfaceTexture = new SurfaceTexture(mTextureSource.getTextureId()); |
| 73 | mSurfaceTexture.detachFromGLContext(); |
| 74 | mSurfaceTexture.setOnFrameAvailableListener(new OnFrameAvailableListener() { |
| 75 | @Override |
| 76 | public void onFrameAvailable(SurfaceTexture surfaceTexture) { |
| 77 | markFrameAvailable(); |
| 78 | } |
| 79 | }); |
| 80 | |
| 81 | mOutputWidth = format.getInteger(MediaFormat.KEY_WIDTH); |
| 82 | mOutputHeight = format.getInteger(MediaFormat.KEY_HEIGHT); |
| 83 | |
| 84 | mTransformMatrix = new float[16]; |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | protected MediaCodec initMediaCodec(MediaFormat format) { |
| 89 | Surface surface = new Surface(mSurfaceTexture); |
| 90 | MediaCodec mediaCodec = MediaCodec.createDecoderByType( |
| 91 | format.getString(MediaFormat.KEY_MIME)); |
| 92 | mediaCodec.configure(format, surface, null, 0); |
| 93 | surface.release(); |
| 94 | return mediaCodec; |
| 95 | } |
| 96 | |
| 97 | @Override |
| 98 | protected boolean onDataAvailable( |
| 99 | MediaCodec codec, ByteBuffer[] buffers, int bufferIndex, BufferInfo info) { |
| 100 | boolean textureAvailable = waitForFrameGrab(); |
| 101 | |
| 102 | mCurrentPresentationTimeUs = info.presentationTimeUs; |
| 103 | |
| 104 | // Only render the next frame if we weren't interrupted. |
| 105 | codec.releaseOutputBuffer(bufferIndex, textureAvailable); |
| 106 | |
| 107 | if (textureAvailable) { |
| 108 | if (updateTexture()) { |
| 109 | notifyListener(); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | return false; |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * Waits for the texture's {@link OnFrameAvailableListener} to be notified and then updates |
| 118 | * the internal {@link SurfaceTexture}. |
| 119 | */ |
| 120 | private boolean updateTexture() { |
| 121 | // Wait for the frame we just released to appear in the texture. |
| 122 | synchronized (mFrameMonitor) { |
| 123 | try { |
| 124 | while (!mFrameAvailable) { |
| 125 | mFrameMonitor.wait(); |
| 126 | } |
| 127 | mSurfaceTexture.attachToGLContext(mTextureSource.getTextureId()); |
| 128 | mSurfaceTexture.updateTexImage(); |
| 129 | mSurfaceTexture.detachFromGLContext(); |
| 130 | return true; |
| 131 | } catch (InterruptedException e) { |
| 132 | return false; |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | @Override |
| 138 | protected void copyFrameDataTo(FrameImage2D outputVideoFrame, int rotation) { |
| 139 | TextureSource targetTexture = TextureSource.newExternalTexture(); |
| 140 | mSurfaceTexture.attachToGLContext(targetTexture.getTextureId()); |
| 141 | mSurfaceTexture.getTransformMatrix(mTransformMatrix); |
| 142 | |
| 143 | ImageShader imageShader = getImageShader(); |
| 144 | imageShader.setSourceTransform(mTransformMatrix); |
| 145 | |
| 146 | int outputWidth = mOutputWidth; |
| 147 | int outputHeight = mOutputHeight; |
| 148 | if (rotation != 0) { |
| 149 | float[] targetCoords = getRotationCoords(rotation); |
| 150 | imageShader.setTargetCoords(targetCoords); |
| 151 | if (needSwapDimension(rotation)) { |
| 152 | outputWidth = mOutputHeight; |
| 153 | outputHeight = mOutputWidth; |
| 154 | } |
| 155 | } |
| 156 | outputVideoFrame.resize(new int[] { outputWidth, outputHeight }); |
| 157 | imageShader.process( |
| 158 | targetTexture, |
| 159 | outputVideoFrame.lockRenderTarget(), |
| 160 | outputWidth, |
| 161 | outputHeight); |
| 162 | outputVideoFrame.setTimestamp(mCurrentPresentationTimeUs * 1000); |
| 163 | outputVideoFrame.unlock(); |
| 164 | targetTexture.release(); |
| 165 | |
| 166 | mSurfaceTexture.detachFromGLContext(); |
| 167 | } |
| 168 | |
| 169 | @Override |
| 170 | public void release() { |
| 171 | super.release(); |
| 172 | synchronized (mFrameMonitor) { |
| 173 | mTextureSource.release(); |
| 174 | mSurfaceTexture.release(); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * This method has to be called on the MFF processing thread. |
| 180 | */ |
| 181 | private ImageShader getImageShader() { |
| 182 | if (mImageShader == null) { |
| 183 | mImageShader = new ImageShader(COPY_FRAGMENT_SHADER); |
| 184 | mImageShader.setTargetRect(0f, 1f, 1f, -1f); |
| 185 | } |
| 186 | return mImageShader; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Get the quad coords for rotation. |
| 191 | * @param rotation applied to the frame, value is one of |
| 192 | * {ROTATE_NONE, ROTATE_90_RIGHT, ROTATE_180, ROTATE_90_LEFT} |
| 193 | * @return coords the calculated quad coords for the given rotation |
| 194 | */ |
| 195 | private static float[] getRotationCoords(int rotation) { |
| 196 | switch(rotation) { |
| 197 | case MediaDecoder.ROTATE_90_RIGHT: |
| 198 | return new float[] { 0f, 0f, 0f, 1f, 1f, 0f, 1f, 1f }; |
| 199 | case MediaDecoder.ROTATE_180: |
| 200 | return new float[] { 1f, 0f, 0f, 0f, 1f, 1f, 0f, 1f }; |
| 201 | case MediaDecoder.ROTATE_90_LEFT: |
| 202 | return new float[] { 1f, 1f, 1f, 0f, 0f, 1f, 0f, 0f }; |
| 203 | case MediaDecoder.ROTATE_NONE: |
| 204 | return new float[] { 0f, 1f, 1f, 1f, 0f, 0f, 1f, 0f }; |
| 205 | default: |
| 206 | throw new IllegalArgumentException("Unsupported rotation angle."); |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | } |