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/*
* Copyright (C) 2015 Yuya Tanaka
*
* 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 net.ypresto.androidtranscoder.engine;
import android.media.MediaCodec;
import android.media.MediaFormat;
import android.media.MediaMuxer;
import android.util.Log;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.List;
/**
* This class queues until all output track formats are determined.
*/
public class QueuedMuxer {
private static final String TAG = "QueuedMuxer";
private static final int BUFFER_SIZE = 64 * 1024; // I have no idea whether this value is appropriate or not...
private final MediaMuxer mMuxer;
private final Listener mListener;
private MediaFormat mVideoFormat;
private MediaFormat mAudioFormat;
private int mVideoTrackIndex;
private int mAudioTrackIndex;
private ByteBuffer mByteBuffer;
private final List<SampleInfo> mSampleInfoList;
private boolean mStarted;
public QueuedMuxer(MediaMuxer muxer, Listener listener) {
mMuxer = muxer;
mListener = listener;
mSampleInfoList = new ArrayList<>();
}
public void setOutputFormat(SampleType sampleType, MediaFormat format) {
switch (sampleType) {
case VIDEO:
mVideoFormat = format;
break;
case AUDIO:
mAudioFormat = format;
break;
default:
throw new AssertionError();
}
onSetOutputFormat();
}
private void onSetOutputFormat() {
if (mVideoFormat == null || mAudioFormat == null) return;
mListener.onDetermineOutputFormat();
mVideoTrackIndex = mMuxer.addTrack(mVideoFormat);
Log.v(TAG, "Added track #" + mVideoTrackIndex + " with " + mVideoFormat.getString(MediaFormat.KEY_MIME) + " to muxer");
mAudioTrackIndex = mMuxer.addTrack(mAudioFormat);
Log.v(TAG, "Added track #" + mAudioTrackIndex + " with " + mAudioFormat.getString(MediaFormat.KEY_MIME) + " to muxer");
mMuxer.start();
mStarted = true;
if (mByteBuffer == null) {
mByteBuffer = ByteBuffer.allocate(0);
}
mByteBuffer.flip();
Log.v(TAG, "Output format determined, writing " + mSampleInfoList.size() +
" samples / " + mByteBuffer.limit() + " bytes to muxer.");
MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
int offset = 0;
for (SampleInfo sampleInfo : mSampleInfoList) {
sampleInfo.writeToBufferInfo(bufferInfo, offset);
mMuxer.writeSampleData(getTrackIndexForSampleType(sampleInfo.mSampleType), mByteBuffer, bufferInfo);
offset += sampleInfo.mSize;
}
mSampleInfoList.clear();
mByteBuffer = null;
}
public void writeSampleData(SampleType sampleType, ByteBuffer byteBuf, MediaCodec.BufferInfo bufferInfo) {
if (mStarted) {
mMuxer.writeSampleData(getTrackIndexForSampleType(sampleType), byteBuf, bufferInfo);
return;
}
byteBuf.limit(bufferInfo.offset + bufferInfo.size);
byteBuf.position(bufferInfo.offset);
if (mByteBuffer == null) {
mByteBuffer = ByteBuffer.allocateDirect(BUFFER_SIZE).order(ByteOrder.nativeOrder());
}
mByteBuffer.put(byteBuf);
mSampleInfoList.add(new SampleInfo(sampleType, bufferInfo.size, bufferInfo));
}
private int getTrackIndexForSampleType(SampleType sampleType) {
switch (sampleType) {
case VIDEO:
return mVideoTrackIndex;
case AUDIO:
return mAudioTrackIndex;
default:
throw new AssertionError();
}
}
public enum SampleType {VIDEO, AUDIO}
private static class SampleInfo {
private final SampleType mSampleType;
private final int mSize;
private final long mPresentationTimeUs;
private final int mFlags;
private SampleInfo(SampleType sampleType, int size, MediaCodec.BufferInfo bufferInfo) {
mSampleType = sampleType;
mSize = size;
mPresentationTimeUs = bufferInfo.presentationTimeUs;
mFlags = bufferInfo.flags;
}
private void writeToBufferInfo(MediaCodec.BufferInfo bufferInfo, int offset) {
bufferInfo.set(offset, mSize, mPresentationTimeUs, mFlags);
}
}
public interface Listener {
void onDetermineOutputFormat();
}
}
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