Benjamin Hendricks | 227b476 | 2013-09-19 14:40:45 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 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 | package androidx.media.filterfw.decoder; |
| 17 | |
| 18 | import android.annotation.TargetApi; |
| 19 | import android.graphics.SurfaceTexture; |
| 20 | import android.media.MediaCodec; |
| 21 | import android.media.MediaCodec.BufferInfo; |
| 22 | import android.media.MediaCodecInfo; |
| 23 | import android.media.MediaCodecInfo.CodecCapabilities; |
| 24 | import android.media.MediaCodecList; |
| 25 | import android.media.MediaFormat; |
| 26 | import android.util.SparseIntArray; |
| 27 | import androidx.media.filterfw.ColorSpace; |
| 28 | import androidx.media.filterfw.Frame; |
| 29 | import androidx.media.filterfw.FrameImage2D; |
| 30 | import androidx.media.filterfw.PixelUtils; |
| 31 | |
| 32 | import java.nio.ByteBuffer; |
| 33 | import java.util.Arrays; |
| 34 | import java.util.HashSet; |
| 35 | import java.util.Set; |
| 36 | import java.util.TreeMap; |
| 37 | |
| 38 | /** |
| 39 | * {@link TrackDecoder} that decodes a video track and renders the frames onto a |
| 40 | * {@link SurfaceTexture}. |
| 41 | * |
| 42 | * This implementation purely uses CPU based methods to decode and color-convert the frames. |
| 43 | */ |
| 44 | @TargetApi(16) |
| 45 | public class CpuVideoTrackDecoder extends VideoTrackDecoder { |
| 46 | |
| 47 | private static final int COLOR_FORMAT_UNSET = -1; |
| 48 | |
| 49 | private final int mWidth; |
| 50 | private final int mHeight; |
| 51 | |
| 52 | private int mColorFormat = COLOR_FORMAT_UNSET; |
| 53 | private long mCurrentPresentationTimeUs; |
| 54 | private ByteBuffer mDecodedBuffer; |
| 55 | private ByteBuffer mUnrotatedBytes; |
| 56 | |
| 57 | protected CpuVideoTrackDecoder(int trackIndex, MediaFormat format, Listener listener) { |
| 58 | super(trackIndex, format, listener); |
| 59 | |
| 60 | mWidth = format.getInteger(MediaFormat.KEY_WIDTH); |
| 61 | mHeight = format.getInteger(MediaFormat.KEY_HEIGHT); |
| 62 | } |
| 63 | |
| 64 | @Override |
| 65 | protected MediaCodec initMediaCodec(MediaFormat format) { |
| 66 | // Find a codec for our video that can output to one of our supported color-spaces |
| 67 | MediaCodec mediaCodec = findDecoderCodec(format, new int[] { |
| 68 | CodecCapabilities.COLOR_Format32bitARGB8888, |
| 69 | CodecCapabilities.COLOR_FormatYUV420Planar}); |
| 70 | if (mediaCodec == null) { |
| 71 | throw new RuntimeException( |
| 72 | "Could not find a suitable decoder for format: " + format + "!"); |
| 73 | } |
| 74 | mediaCodec.configure(format, null, null, 0); |
| 75 | return mediaCodec; |
| 76 | } |
| 77 | |
| 78 | @Override |
| 79 | protected boolean onDataAvailable( |
| 80 | MediaCodec codec, ByteBuffer[] buffers, int bufferIndex, BufferInfo info) { |
| 81 | |
| 82 | mCurrentPresentationTimeUs = info.presentationTimeUs; |
| 83 | mDecodedBuffer = buffers[bufferIndex]; |
| 84 | |
| 85 | if (mColorFormat == -1) { |
| 86 | mColorFormat = codec.getOutputFormat().getInteger(MediaFormat.KEY_COLOR_FORMAT); |
| 87 | } |
| 88 | |
| 89 | markFrameAvailable(); |
| 90 | notifyListener(); |
| 91 | |
| 92 | // Wait for the grab before we release this buffer. |
| 93 | waitForFrameGrab(); |
| 94 | |
| 95 | codec.releaseOutputBuffer(bufferIndex, false); |
| 96 | |
| 97 | return false; |
| 98 | } |
| 99 | |
| 100 | @Override |
| 101 | protected void copyFrameDataTo(FrameImage2D outputVideoFrame, int rotation) { |
| 102 | // Calculate output dimensions |
| 103 | int outputWidth = mWidth; |
| 104 | int outputHeight = mHeight; |
| 105 | if (needSwapDimension(rotation)) { |
| 106 | outputWidth = mHeight; |
| 107 | outputHeight = mWidth; |
| 108 | } |
| 109 | |
| 110 | // Create output frame |
| 111 | outputVideoFrame.resize(new int[] {outputWidth, outputHeight}); |
| 112 | outputVideoFrame.setTimestamp(mCurrentPresentationTimeUs * 1000); |
| 113 | ByteBuffer outBytes = outputVideoFrame.lockBytes(Frame.MODE_WRITE); |
| 114 | |
| 115 | // Set data |
| 116 | if (rotation == MediaDecoder.ROTATE_NONE) { |
| 117 | convertImage(mDecodedBuffer, outBytes, mColorFormat, mWidth, mHeight); |
| 118 | } else { |
| 119 | if (mUnrotatedBytes == null) { |
| 120 | mUnrotatedBytes = ByteBuffer.allocateDirect(mWidth * mHeight * 4); |
| 121 | } |
| 122 | // TODO: This could be optimized by including the rotation in the color conversion. |
| 123 | convertImage(mDecodedBuffer, mUnrotatedBytes, mColorFormat, mWidth, mHeight); |
| 124 | copyRotate(mUnrotatedBytes, outBytes, rotation); |
| 125 | } |
| 126 | outputVideoFrame.unlock(); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Copy the input data to the output data applying the specified rotation. |
| 131 | * |
| 132 | * @param input The input image data |
| 133 | * @param output Buffer for the output image data |
| 134 | * @param rotation The rotation to apply |
| 135 | */ |
| 136 | private void copyRotate(ByteBuffer input, ByteBuffer output, int rotation) { |
| 137 | int offset; |
| 138 | int pixStride; |
| 139 | int rowStride; |
| 140 | switch (rotation) { |
| 141 | case MediaDecoder.ROTATE_NONE: |
| 142 | offset = 0; |
| 143 | pixStride = 1; |
| 144 | rowStride = mWidth; |
| 145 | break; |
| 146 | case MediaDecoder.ROTATE_90_LEFT: |
| 147 | offset = (mWidth - 1) * mHeight; |
| 148 | pixStride = -mHeight; |
| 149 | rowStride = 1; |
| 150 | break; |
| 151 | case MediaDecoder.ROTATE_90_RIGHT: |
| 152 | offset = mHeight - 1; |
| 153 | pixStride = mHeight; |
| 154 | rowStride = -1; |
| 155 | break; |
| 156 | case MediaDecoder.ROTATE_180: |
| 157 | offset = mWidth * mHeight - 1; |
| 158 | pixStride = -1; |
| 159 | rowStride = -mWidth; |
| 160 | break; |
| 161 | default: |
| 162 | throw new IllegalArgumentException("Unsupported rotation " + rotation + "!"); |
| 163 | } |
| 164 | PixelUtils.copyPixels(input, output, mWidth, mHeight, offset, pixStride, rowStride); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Looks for a codec with the specified requirements. |
| 169 | * |
| 170 | * The set of codecs will be filtered down to those that meet the following requirements: |
| 171 | * <ol> |
| 172 | * <li>The codec is a decoder.</li> |
| 173 | * <li>The codec can decode a video of the specified format.</li> |
| 174 | * <li>The codec can decode to one of the specified color formats.</li> |
| 175 | * </ol> |
| 176 | * If multiple codecs are found, the one with the preferred color-format is taken. Color format |
| 177 | * preference is determined by the order of their appearance in the color format array. |
| 178 | * |
| 179 | * @param format The format the codec must decode. |
| 180 | * @param requiredColorFormats Array of target color spaces ordered by preference. |
| 181 | * @return A codec that meets the requirements, or null if no such codec was found. |
| 182 | */ |
| 183 | private static MediaCodec findDecoderCodec(MediaFormat format, int[] requiredColorFormats) { |
| 184 | TreeMap<Integer, String> candidateCodecs = new TreeMap<Integer, String>(); |
| 185 | SparseIntArray colorPriorities = intArrayToPriorityMap(requiredColorFormats); |
| 186 | for (int i = 0; i < MediaCodecList.getCodecCount(); ++i) { |
| 187 | // Get next codec |
| 188 | MediaCodecInfo info = MediaCodecList.getCodecInfoAt(i); |
| 189 | |
| 190 | // Check that this is a decoder |
| 191 | if (info.isEncoder()) { |
| 192 | continue; |
| 193 | } |
| 194 | |
| 195 | // Check if this codec can decode the video in question |
| 196 | String requiredType = format.getString(MediaFormat.KEY_MIME); |
| 197 | String[] supportedTypes = info.getSupportedTypes(); |
| 198 | Set<String> typeSet = new HashSet<String>(Arrays.asList(supportedTypes)); |
| 199 | |
| 200 | // Check if it can decode to one of the required color formats |
| 201 | if (typeSet.contains(requiredType)) { |
| 202 | CodecCapabilities capabilities = info.getCapabilitiesForType(requiredType); |
| 203 | for (int supportedColorFormat : capabilities.colorFormats) { |
| 204 | if (colorPriorities.indexOfKey(supportedColorFormat) >= 0) { |
| 205 | int priority = colorPriorities.get(supportedColorFormat); |
| 206 | candidateCodecs.put(priority, info.getName()); |
| 207 | } |
| 208 | } |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | // Pick the best codec (with the highest color priority) |
| 213 | if (candidateCodecs.isEmpty()) { |
| 214 | return null; |
| 215 | } else { |
| 216 | String bestCodec = candidateCodecs.firstEntry().getValue(); |
| 217 | return MediaCodec.createByCodecName(bestCodec); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | private static SparseIntArray intArrayToPriorityMap(int[] values) { |
| 222 | SparseIntArray result = new SparseIntArray(); |
| 223 | for (int priority = 0; priority < values.length; ++priority) { |
| 224 | result.append(values[priority], priority); |
| 225 | } |
| 226 | return result; |
| 227 | } |
| 228 | |
| 229 | private static void convertImage( |
| 230 | ByteBuffer input, ByteBuffer output, int colorFormat, int width, int height) { |
| 231 | switch (colorFormat) { |
| 232 | case CodecCapabilities.COLOR_Format32bitARGB8888: |
| 233 | ColorSpace.convertArgb8888ToRgba8888(input, output, width, height); |
| 234 | break; |
| 235 | case CodecCapabilities.COLOR_FormatYUV420Planar: |
| 236 | ColorSpace.convertYuv420pToRgba8888(input, output, width, height); |
| 237 | break; |
| 238 | default: |
| 239 | throw new RuntimeException("Unsupported color format: " + colorFormat + "!"); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | } |