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/*
* Copyright (C) 2017 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 com.android.tv.tuner.exoplayer.audio;
import android.media.MediaCodec;
import android.util.Log;
import com.google.android.exoplayer.CodecCounters;
import com.google.android.exoplayer.DecoderInfo;
import com.google.android.exoplayer.ExoPlaybackException;
import com.google.android.exoplayer.MediaCodecSelector;
import com.google.android.exoplayer.MediaCodecUtil;
import com.google.android.exoplayer.MediaFormat;
import com.google.android.exoplayer.SampleHolder;
import java.nio.ByteBuffer;
import java.util.ArrayList;
/** A decoder to use MediaCodec for decoding audio stream. */
public class MediaCodecAudioDecoder extends AudioDecoder {
private static final String TAG = "MediaCodecAudioDecoder";
public static final int INDEX_INVALID = -1;
private final CodecCounters mCodecCounters;
private final MediaCodecSelector mSelector;
private MediaCodec mCodec;
private MediaCodec.BufferInfo mOutputBufferInfo;
private ByteBuffer mMediaCodecOutputBuffer;
private ArrayList<Long> mDecodeOnlyPresentationTimestamps;
private boolean mWaitingForFirstSyncFrame;
private boolean mIsNewIndex;
private int mInputIndex;
private int mOutputIndex;
/** Creates a MediaCodec based audio decoder. */
public MediaCodecAudioDecoder(MediaCodecSelector selector) {
mSelector = selector;
mOutputBufferInfo = new MediaCodec.BufferInfo();
mCodecCounters = new CodecCounters();
mDecodeOnlyPresentationTimestamps = new ArrayList<>();
}
/** Returns {@code true} if there is decoder for {@code mimeType}. */
public static boolean supportMimeType(MediaCodecSelector selector, String mimeType) {
if (selector == null) {
return false;
}
return getDecoderInfo(selector, mimeType) != null;
}
private static DecoderInfo getDecoderInfo(MediaCodecSelector selector, String mimeType) {
try {
return selector.getDecoderInfo(mimeType, false);
} catch (MediaCodecUtil.DecoderQueryException e) {
Log.e(TAG, "Select decoder error:" + e);
return null;
}
}
private boolean shouldInitCodec(MediaFormat format) {
return format != null && mCodec == null;
}
@Override
public void maybeInitDecoder(MediaFormat format) throws ExoPlaybackException {
if (!shouldInitCodec(format)) {
return;
}
String mimeType = format.mimeType;
DecoderInfo decoderInfo = getDecoderInfo(mSelector, mimeType);
if (decoderInfo == null) {
Log.i(TAG, "There is not decoder found for " + mimeType);
return;
}
String codecName = decoderInfo.name;
try {
mCodec = MediaCodec.createByCodecName(codecName);
mCodec.configure(format.getFrameworkMediaFormatV16(), null, null, 0);
mCodec.start();
} catch (Exception e) {
Log.e(TAG, "Failed when configure or start codec:" + e);
throw new ExoPlaybackException(e);
}
mInputIndex = INDEX_INVALID;
mOutputIndex = INDEX_INVALID;
mWaitingForFirstSyncFrame = true;
mCodecCounters.codecInitCount++;
}
@Override
public void resetDecoderState(String mimeType) {
if (mCodec == null) {
return;
}
mInputIndex = INDEX_INVALID;
mOutputIndex = INDEX_INVALID;
mDecodeOnlyPresentationTimestamps.clear();
mCodec.flush();
mWaitingForFirstSyncFrame = true;
}
@Override
public void release() {
if (mCodec != null) {
mDecodeOnlyPresentationTimestamps.clear();
mInputIndex = INDEX_INVALID;
mOutputIndex = INDEX_INVALID;
mCodecCounters.codecReleaseCount++;
try {
mCodec.stop();
} finally {
try {
mCodec.release();
} finally {
mCodec = null;
}
}
}
}
/** Returns the index of input buffer which is ready for using. */
public int getInputIndex() {
return mInputIndex;
}
@Override
public ByteBuffer getInputBuffer() {
if (mInputIndex < 0) {
mInputIndex = mCodec.dequeueInputBuffer(0);
if (mInputIndex < 0) {
return null;
}
return mCodec.getInputBuffer(mInputIndex);
}
return mCodec.getInputBuffer(mInputIndex);
}
@Override
public void decode(SampleHolder sampleHolder) {
if (mWaitingForFirstSyncFrame) {
if (!sampleHolder.isSyncFrame()) {
sampleHolder.clearData();
return;
}
mWaitingForFirstSyncFrame = false;
}
long presentationTimeUs = sampleHolder.timeUs;
if (sampleHolder.isDecodeOnly()) {
mDecodeOnlyPresentationTimestamps.add(presentationTimeUs);
}
mCodec.queueInputBuffer(mInputIndex, 0, sampleHolder.data.limit(), presentationTimeUs, 0);
mInputIndex = INDEX_INVALID;
mCodecCounters.inputBufferCount++;
}
private int getDecodeOnlyIndex(long presentationTimeUs) {
final int size = mDecodeOnlyPresentationTimestamps.size();
for (int i = 0; i < size; i++) {
if (mDecodeOnlyPresentationTimestamps.get(i).longValue() == presentationTimeUs) {
return i;
}
}
return INDEX_INVALID;
}
/** Returns the index of output buffer which is ready for using. */
public int getOutputIndex() {
if (mOutputIndex < 0) {
mOutputIndex = mCodec.dequeueOutputBuffer(mOutputBufferInfo, 0);
mIsNewIndex = true;
} else {
mIsNewIndex = false;
}
return mOutputIndex;
}
@Override
public android.media.MediaFormat getOutputFormat() {
return mCodec.getOutputFormat();
}
/** Returns {@code true} if the output is only for decoding but not for rendering. */
public boolean maybeDecodeOnlyIndex() {
int decodeOnlyIndex = getDecodeOnlyIndex(mOutputBufferInfo.presentationTimeUs);
if (decodeOnlyIndex != INDEX_INVALID) {
mCodec.releaseOutputBuffer(mOutputIndex, false);
mCodecCounters.skippedOutputBufferCount++;
mDecodeOnlyPresentationTimestamps.remove(decodeOnlyIndex);
mOutputIndex = INDEX_INVALID;
return true;
}
return false;
}
@Override
public ByteBuffer getDecodedSample() {
if (maybeDecodeOnlyIndex() || mOutputIndex < 0) {
return null;
}
if (mIsNewIndex) {
mMediaCodecOutputBuffer = mCodec.getOutputBuffer(mOutputIndex);
}
return mMediaCodecOutputBuffer;
}
@Override
public long getDecodedTimeUs() {
return mOutputBufferInfo.presentationTimeUs;
}
/** Releases the output buffer after rendering. */
public void releaseOutputBuffer() {
mCodecCounters.renderedOutputBufferCount++;
mCodec.releaseOutputBuffer(mOutputIndex, false);
mOutputIndex = INDEX_INVALID;
}
}
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