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/*
* Copyright (C) 2015 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.usbtuner.exoplayer;
import android.media.MediaDataSource;
import android.media.MediaExtractor;
import android.os.ConditionVariable;
import android.os.SystemClock;
import android.util.Log;
import com.google.android.exoplayer.MediaFormat;
import com.google.android.exoplayer.MediaFormatHolder;
import com.google.android.exoplayer.MediaFormatUtil;
import com.google.android.exoplayer.SampleHolder;
import com.android.usbtuner.exoplayer.cache.CacheManager;
import com.android.usbtuner.exoplayer.cache.RecordingSampleBuffer;
import com.android.usbtuner.exoplayer.cache.SimpleSampleBuffer;
import com.android.usbtuner.tvinput.PlaybackCacheListener;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicLong;
/**
* A class that plays a live stream from a given media extractor using an extractor thread.
*/
public class PlaySampleExtractor implements SampleExtractor {
private static final String TAG = "PlaySampleExtractor";
// Maximum bandwidth of 1080p channel is about 2.2MB/s. 2MB for a sample will suffice.
private static final int SAMPLE_BUFFER_SIZE = 1024 * 1024 * 2;
private static final AtomicLong ID_COUNTER = new AtomicLong(0);
private final MediaDataSource mDataSource;
private final MediaExtractor mMediaExtractor;
private final ExtractorThread mExtractorThread;
private final CacheManager.SampleBuffer mSampleBuffer;
private final long mId;
private MediaFormat[] mTrackFormats;
private boolean mReleased = false;
public PlaySampleExtractor(MediaDataSource source, CacheManager cacheManager,
PlaybackCacheListener cacheListener, boolean useCache) {
mId = ID_COUNTER.incrementAndGet();
mDataSource = source;
mMediaExtractor = new MediaExtractor();
mExtractorThread = new ExtractorThread();
if (useCache) {
mSampleBuffer = new RecordingSampleBuffer(cacheManager, cacheListener, true,
RecordingSampleBuffer.CACHE_REASON_LIVE_PLAYBACK);
} else {
mSampleBuffer = new SimpleSampleBuffer(cacheListener);
}
}
private class ExtractorThread extends Thread {
private volatile boolean mQuitRequested = false;
public ExtractorThread() {
super("ExtractorThread");
}
@Override
public void run() {
SampleHolder sample = new SampleHolder(SampleHolder.BUFFER_REPLACEMENT_MODE_NORMAL);
sample.ensureSpaceForWrite(SAMPLE_BUFFER_SIZE);
ConditionVariable conditionVariable = new ConditionVariable();
while (!mQuitRequested) {
fetchSample(sample, conditionVariable);
}
cleanUp();
}
private void fetchSample(SampleHolder sample, ConditionVariable conditionVariable) {
int index = mMediaExtractor.getSampleTrackIndex();
if (index < 0) {
Log.i(TAG, "EoS");
mQuitRequested = true;
mSampleBuffer.setEos();
return;
}
sample.data.clear();
sample.size = mMediaExtractor.readSampleData(sample.data, 0);
if (sample.size < 0 || sample.size > SAMPLE_BUFFER_SIZE) {
// Should not happen
Log.e(TAG, "Invalid sample size: " + sample.size);
mMediaExtractor.advance();
return;
}
sample.data.position(sample.size);
sample.timeUs = mMediaExtractor.getSampleTime();
sample.flags = mMediaExtractor.getSampleFlags();
mMediaExtractor.advance();
try {
queueSample(index, sample, conditionVariable);
} catch (IOException e) {
mQuitRequested = true;
mSampleBuffer.setEos();
}
}
public void quit() {
mQuitRequested = true;
}
}
public void queueSample(int index, SampleHolder sample, ConditionVariable conditionVariable)
throws IOException {
long writeStartTimeNs = SystemClock.elapsedRealtimeNanos();
mSampleBuffer.writeSample(index, sample, conditionVariable);
// Check if the storage has enough bandwidth for trickplay. Otherwise we disable it
// and notify the slowness through the playback cache listener.
if (mSampleBuffer.isWriteSpeedSlow(sample.size,
SystemClock.elapsedRealtimeNanos() - writeStartTimeNs)) {
mSampleBuffer.handleWriteSpeedSlow();
}
}
@Override
public boolean prepare() throws IOException {
synchronized (this) {
mMediaExtractor.setDataSource(mDataSource);
int trackCount = mMediaExtractor.getTrackCount();
mTrackFormats = new MediaFormat[trackCount];
for (int i = 0; i < trackCount; i++) {
mTrackFormats[i] =
MediaFormatUtil.createMediaFormat(mMediaExtractor.getTrackFormat(i));
mMediaExtractor.selectTrack(i);
}
List<String> ids = new ArrayList<>();
for (int i = 0; i < trackCount; i++) {
ids.add(String.format(Locale.ENGLISH, "%s_%x", Long.toHexString(mId), i));
}
mSampleBuffer.init(ids, null);
}
mExtractorThread.start();
return true;
}
@Override
public synchronized MediaFormat[] getTrackFormats() {
return mTrackFormats;
}
@Override
public void getTrackMediaFormat(int track, MediaFormatHolder outMediaFormatHolder) {
outMediaFormatHolder.format = mTrackFormats[track];
outMediaFormatHolder.drmInitData = null;
}
@Override
public void selectTrack(int index) {
mSampleBuffer.selectTrack(index);
}
@Override
public void deselectTrack(int index) {
mSampleBuffer.deselectTrack(index);
}
@Override
public long getBufferedPositionUs() {
return mSampleBuffer.getBufferedPositionUs();
}
@Override
public boolean continueBuffering(long positionUs) {
return mSampleBuffer.continueBuffering(positionUs);
}
@Override
public void seekTo(long positionUs) {
mSampleBuffer.seekTo(positionUs);
}
@Override
public int readSample(int track, SampleHolder sampleHolder) {
return mSampleBuffer.readSample(track, sampleHolder);
}
@Override
public void release() {
synchronized (this) {
mReleased = true;
}
if (mExtractorThread.isAlive()) {
mExtractorThread.quit();
// We don't join here to prevent hang --- MediaExtractor is released at the thread.
} else {
cleanUp();
}
}
public void cleanUpImpl() {
mSampleBuffer.release();
}
public synchronized void cleanUp() {
if (!mReleased) {
return;
}
cleanUpImpl();
mMediaExtractor.release();
}
}
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