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media/library/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java
andrewlewis b120bea029 Don't reuse MediaPeriods. 
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130266483
2016-08-31 15:25:06 +01:00

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/*
* Copyright (C) 2016 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.google.android.exoplayer2;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.os.Process;
import android.os.SystemClock;
import android.util.Log;
import android.util.Pair;
import com.google.android.exoplayer2.ExoPlayer.ExoPlayerMessage;
import com.google.android.exoplayer2.source.MediaPeriod;
import com.google.android.exoplayer2.source.MediaSource;
import com.google.android.exoplayer2.source.SampleStream;
import com.google.android.exoplayer2.source.Timeline;
import com.google.android.exoplayer2.trackselection.TrackSelection;
import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
import com.google.android.exoplayer2.trackselection.TrackSelector;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.MediaClock;
import com.google.android.exoplayer2.util.PriorityHandlerThread;
import com.google.android.exoplayer2.util.StandaloneMediaClock;
import com.google.android.exoplayer2.util.TraceUtil;
import com.google.android.exoplayer2.util.Util;
import java.io.IOException;
/**
* Implements the internal behavior of {@link ExoPlayerImpl}.
*/
/* package */ final class ExoPlayerImplInternal implements Handler.Callback, MediaPeriod.Callback,
TrackSelector.InvalidationListener, MediaSource.Listener {
/**
* Playback position information which is read on the application's thread by
* {@link ExoPlayerImpl} and read/written internally on the player's thread.
*/
public static final class PlaybackInfo {
public final int periodIndex;
public volatile long positionUs;
public volatile long bufferedPositionUs;
public volatile long startPositionUs;
public PlaybackInfo(int periodIndex) {
this.periodIndex = periodIndex;
}
}
private static final String TAG = "ExoPlayerImplInternal";
// External messages
public static final int MSG_STATE_CHANGED = 1;
public static final int MSG_LOADING_CHANGED = 2;
public static final int MSG_SET_PLAY_WHEN_READY_ACK = 3;
public static final int MSG_SEEK_ACK = 4;
public static final int MSG_POSITION_DISCONTINUITY = 5;
public static final int MSG_SOURCE_INFO_REFRESHED = 6;
public static final int MSG_ERROR = 7;
// Internal messages
private static final int MSG_SET_MEDIA_SOURCE = 0;
private static final int MSG_SET_PLAY_WHEN_READY = 1;
private static final int MSG_DO_SOME_WORK = 2;
private static final int MSG_SEEK_TO = 3;
private static final int MSG_STOP = 4;
private static final int MSG_RELEASE = 5;
private static final int MSG_PERIOD_PREPARED = 6;
private static final int MSG_SOURCE_CONTINUE_LOADING_REQUESTED = 7;
private static final int MSG_TRACK_SELECTION_INVALIDATED = 8;
private static final int MSG_CUSTOM = 9;
private static final int PREPARING_SOURCE_INTERVAL_MS = 10;
private static final int RENDERING_INTERVAL_MS = 10;
private static final int IDLE_INTERVAL_MS = 1000;
/**
* Limits the maximum number of periods to buffer ahead of the current playing period. The
* buffering policy normally prevents buffering too far ahead, but the policy could allow too many
* small periods to be buffered if the period count were not limited.
*/
private static final int MAXIMUM_BUFFER_AHEAD_PERIODS = 100;
private final Renderer[] renderers;
private final RendererCapabilities[] rendererCapabilities;
private final TrackSelector trackSelector;
private final LoadControl loadControl;
private final StandaloneMediaClock standaloneMediaClock;
private final Handler handler;
private final HandlerThread internalPlaybackThread;
private final Handler eventHandler;
private PlaybackInfo playbackInfo;
private Renderer rendererMediaClockSource;
private MediaClock rendererMediaClock;
private MediaSource mediaSource;
private Renderer[] enabledRenderers;
private boolean released;
private boolean playWhenReady;
private boolean rebuffering;
private boolean isLoading;
private int state;
private int customMessagesSent;
private int customMessagesProcessed;
private long elapsedRealtimeUs;
private long internalPositionUs;
private boolean isTimelineReady;
private boolean isTimelineEnded;
private int bufferAheadPeriodCount;
private Period playingPeriod;
private Period readingPeriod;
private Period loadingPeriod;
private long playingPeriodEndPositionUs;
private Timeline timeline;
public ExoPlayerImplInternal(Renderer[] renderers, TrackSelector trackSelector,
LoadControl loadControl, boolean playWhenReady, Handler eventHandler,
PlaybackInfo playbackInfo) {
this.renderers = renderers;
this.trackSelector = trackSelector;
this.loadControl = loadControl;
this.playWhenReady = playWhenReady;
this.eventHandler = eventHandler;
this.state = ExoPlayer.STATE_IDLE;
this.playbackInfo = playbackInfo;
rendererCapabilities = new RendererCapabilities[renderers.length];
for (int i = 0; i < renderers.length; i++) {
renderers[i].setIndex(i);
rendererCapabilities[i] = renderers[i].getCapabilities();
}
playingPeriodEndPositionUs = C.UNSET_TIME_US;
standaloneMediaClock = new StandaloneMediaClock();
enabledRenderers = new Renderer[0];
trackSelector.init(this);
// Note: The documentation for Process.THREAD_PRIORITY_AUDIO that states "Applications can
// not normally change to this priority" is incorrect.
internalPlaybackThread = new PriorityHandlerThread("ExoPlayerImplInternal:Handler",
Process.THREAD_PRIORITY_AUDIO);
internalPlaybackThread.start();
handler = new Handler(internalPlaybackThread.getLooper(), this);
}
public void setMediaSource(MediaSource mediaSource, boolean resetPosition) {
handler.obtainMessage(MSG_SET_MEDIA_SOURCE, resetPosition ? 1 : 0, 0, mediaSource)
.sendToTarget();
}
public void setPlayWhenReady(boolean playWhenReady) {
handler.obtainMessage(MSG_SET_PLAY_WHEN_READY, playWhenReady ? 1 : 0, 0).sendToTarget();
}
public void seekTo(int periodIndex, long positionUs) {
handler.obtainMessage(MSG_SEEK_TO, periodIndex, 0, positionUs).sendToTarget();
}
public void stop() {
handler.sendEmptyMessage(MSG_STOP);
}
public void sendMessages(ExoPlayerMessage... messages) {
if (released) {
Log.w(TAG, "Ignoring messages sent after release.");
return;
}
customMessagesSent++;
handler.obtainMessage(MSG_CUSTOM, messages).sendToTarget();
}
public synchronized void blockingSendMessages(ExoPlayerMessage... messages) {
if (released) {
Log.w(TAG, "Ignoring messages sent after release.");
return;
}
int messageNumber = customMessagesSent++;
handler.obtainMessage(MSG_CUSTOM, messages).sendToTarget();
while (customMessagesProcessed <= messageNumber) {
try {
wait();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
public synchronized void release() {
if (released) {
return;
}
handler.sendEmptyMessage(MSG_RELEASE);
while (!released) {
try {
wait();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
internalPlaybackThread.quit();
}
// TrackSelector.InvalidationListener implementation.
@Override
public void onTrackSelectionsInvalidated() {
handler.sendEmptyMessage(MSG_TRACK_SELECTION_INVALIDATED);
}
// MediaPeriod.Callback implementation.
@Override
public void onPrepared(MediaPeriod source) {
handler.obtainMessage(MSG_PERIOD_PREPARED, source).sendToTarget();
}
@Override
public void onContinueLoadingRequested(MediaPeriod source) {
handler.obtainMessage(MSG_SOURCE_CONTINUE_LOADING_REQUESTED, source).sendToTarget();
}
// Handler.Callback implementation.
@Override
public boolean handleMessage(Message msg) {
try {
switch (msg.what) {
case MSG_SET_MEDIA_SOURCE: {
setMediaSourceInternal((MediaSource) msg.obj, msg.arg1 != 0);
return true;
}
case MSG_SET_PLAY_WHEN_READY: {
setPlayWhenReadyInternal(msg.arg1 != 0);
return true;
}
case MSG_DO_SOME_WORK: {
doSomeWork();
return true;
}
case MSG_SEEK_TO: {
seekToInternal(msg.arg1, (Long) msg.obj);
return true;
}
case MSG_STOP: {
stopInternal();
return true;
}
case MSG_RELEASE: {
releaseInternal();
return true;
}
case MSG_PERIOD_PREPARED: {
handlePeriodPrepared((MediaPeriod) msg.obj);
return true;
}
case MSG_SOURCE_CONTINUE_LOADING_REQUESTED: {
handleContinueLoadingRequested((MediaPeriod) msg.obj);
return true;
}
case MSG_TRACK_SELECTION_INVALIDATED: {
reselectTracksInternal();
return true;
}
case MSG_CUSTOM: {
sendMessagesInternal((ExoPlayerMessage[]) msg.obj);
return true;
}
default:
return false;
}
} catch (ExoPlaybackException e) {
Log.e(TAG, "Renderer error.", e);
eventHandler.obtainMessage(MSG_ERROR, e).sendToTarget();
stopInternal();
return true;
} catch (IOException e) {
Log.e(TAG, "Source error.", e);
eventHandler.obtainMessage(MSG_ERROR, ExoPlaybackException.createForSource(e)).sendToTarget();
stopInternal();
return true;
} catch (RuntimeException e) {
Log.e(TAG, "Internal runtime error.", e);
eventHandler.obtainMessage(MSG_ERROR, ExoPlaybackException.createForUnexpected(e))
.sendToTarget();
stopInternal();
return true;
}
}
// MediaSource.Listener implementation.
@Override
public void onSourceInfoRefreshed(Timeline timeline, Object manifest) {
try {
eventHandler.obtainMessage(MSG_SOURCE_INFO_REFRESHED, Pair.create(timeline, manifest))
.sendToTarget();
handleTimelineRefreshed(timeline);
} catch (ExoPlaybackException | IOException e) {
Log.e(TAG, "Error handling timeline change.", e);
eventHandler.obtainMessage(MSG_ERROR, e).sendToTarget();
stopInternal();
}
}
// Private methods.
private void setState(int state) {
if (this.state != state) {
this.state = state;
eventHandler.obtainMessage(MSG_STATE_CHANGED, state, 0).sendToTarget();
}
}
private void setIsLoading(boolean isLoading) {
if (this.isLoading != isLoading) {
this.isLoading = isLoading;
eventHandler.obtainMessage(MSG_LOADING_CHANGED, isLoading ? 1 : 0, 0).sendToTarget();
}
}
private void setMediaSourceInternal(MediaSource mediaSource, boolean resetPosition)
throws ExoPlaybackException {
resetInternal();
if (resetPosition) {
playbackInfo = new PlaybackInfo(0);
playbackInfo.startPositionUs = C.UNSET_TIME_US;
playbackInfo.positionUs = C.UNSET_TIME_US;
}
this.mediaSource = mediaSource;
mediaSource.prepareSource(this);
setState(ExoPlayer.STATE_BUFFERING);
handler.sendEmptyMessage(MSG_DO_SOME_WORK);
}
private void setPlayWhenReadyInternal(boolean playWhenReady) throws ExoPlaybackException {
try {
rebuffering = false;
this.playWhenReady = playWhenReady;
if (!playWhenReady) {
stopRenderers();
updatePlaybackPositions();
} else {
if (state == ExoPlayer.STATE_READY) {
startRenderers();
handler.sendEmptyMessage(MSG_DO_SOME_WORK);
} else if (state == ExoPlayer.STATE_BUFFERING) {
handler.sendEmptyMessage(MSG_DO_SOME_WORK);
}
}
} finally {
eventHandler.sendEmptyMessage(MSG_SET_PLAY_WHEN_READY_ACK);
}
}
private void startRenderers() throws ExoPlaybackException {
rebuffering = false;
standaloneMediaClock.start();
for (Renderer renderer : enabledRenderers) {
renderer.start();
}
}
private void stopRenderers() throws ExoPlaybackException {
standaloneMediaClock.stop();
for (Renderer renderer : enabledRenderers) {
ensureStopped(renderer);
}
}
private void updatePlaybackPositions() throws ExoPlaybackException {
if (playingPeriod == null) {
return;
}
MediaPeriod mediaPeriod = playingPeriod.mediaPeriod;
// Update the playback position.
long positionUs = mediaPeriod.readDiscontinuity();
if (positionUs != C.UNSET_TIME_US) {
resetInternalPosition(positionUs);
} else {
if (rendererMediaClockSource != null && !rendererMediaClockSource.isEnded()) {
internalPositionUs = rendererMediaClock.getPositionUs();
standaloneMediaClock.setPositionUs(internalPositionUs);
} else {
internalPositionUs = standaloneMediaClock.getPositionUs();
}
positionUs = internalPositionUs - playingPeriod.offsetUs;
}
playbackInfo.positionUs = positionUs;
elapsedRealtimeUs = SystemClock.elapsedRealtime() * 1000;
// Update the buffered position.
long bufferedPositionUs = enabledRenderers.length == 0 ? C.END_OF_SOURCE_US
: mediaPeriod.getBufferedPositionUs();
playbackInfo.bufferedPositionUs = bufferedPositionUs == C.END_OF_SOURCE_US
? timeline.getPeriodDurationUs(playingPeriod.index) : bufferedPositionUs;
}
private void doSomeWork() throws ExoPlaybackException, IOException {
long operationStartTimeMs = SystemClock.elapsedRealtime();
updatePeriods();
if (playingPeriod == null) {
// We're still waiting for the first period to be prepared.
maybeThrowPeriodPrepareError();
scheduleNextOperation(MSG_DO_SOME_WORK, operationStartTimeMs, PREPARING_SOURCE_INTERVAL_MS);
return;
}
TraceUtil.beginSection("doSomeWork");
updatePlaybackPositions();
boolean allRenderersEnded = true;
boolean allRenderersReadyOrEnded = true;
for (Renderer renderer : enabledRenderers) {
// TODO: Each renderer should return the maximum delay before which it wishes to be called
// again. The minimum of these values should then be used as the delay before the next
// invocation of this method.
renderer.render(internalPositionUs, elapsedRealtimeUs);
allRenderersEnded = allRenderersEnded && renderer.isEnded();
// Determine whether the renderer is ready (or ended). If it's not, throw an error that's
// preventing the renderer from making progress, if such an error exists.
boolean rendererReadyOrEnded = renderer.isReady() || renderer.isEnded();
if (!rendererReadyOrEnded) {
renderer.maybeThrowStreamError();
}
allRenderersReadyOrEnded = allRenderersReadyOrEnded && rendererReadyOrEnded;
}
if (!allRenderersReadyOrEnded) {
maybeThrowPeriodPrepareError();
}
long playingPeriodDuration = timeline.getPeriodDurationUs(playingPeriod.index);
if (allRenderersEnded
&& (playingPeriodDuration == C.UNSET_TIME_US
|| playingPeriodDuration <= playbackInfo.positionUs)
&& isTimelineEnded) {
setState(ExoPlayer.STATE_ENDED);
stopRenderers();
} else if (state == ExoPlayer.STATE_BUFFERING) {
if ((enabledRenderers.length > 0
? (allRenderersReadyOrEnded && haveSufficientBuffer(rebuffering)) : isTimelineReady)) {
setState(ExoPlayer.STATE_READY);
if (playWhenReady) {
startRenderers();
}
}
} else if (state == ExoPlayer.STATE_READY) {
if (enabledRenderers.length > 0 ? !allRenderersReadyOrEnded : !isTimelineReady) {
rebuffering = playWhenReady;
setState(ExoPlayer.STATE_BUFFERING);
stopRenderers();
}
}
if (state == ExoPlayer.STATE_BUFFERING) {
for (Renderer renderer : enabledRenderers) {
renderer.maybeThrowStreamError();
}
}
handler.removeMessages(MSG_DO_SOME_WORK);
if ((playWhenReady && state == ExoPlayer.STATE_READY) || state == ExoPlayer.STATE_BUFFERING) {
scheduleNextOperation(MSG_DO_SOME_WORK, operationStartTimeMs, RENDERING_INTERVAL_MS);
} else if (enabledRenderers.length != 0) {
scheduleNextOperation(MSG_DO_SOME_WORK, operationStartTimeMs, IDLE_INTERVAL_MS);
}
TraceUtil.endSection();
}
private void scheduleNextOperation(int operationType, long thisOperationStartTimeMs,
long intervalMs) {
long nextOperationStartTimeMs = thisOperationStartTimeMs + intervalMs;
long nextOperationDelayMs = nextOperationStartTimeMs - SystemClock.elapsedRealtime();
if (nextOperationDelayMs <= 0) {
handler.sendEmptyMessage(operationType);
} else {
handler.sendEmptyMessageDelayed(operationType, nextOperationDelayMs);
}
}
private void seekToInternal(int periodIndex, long positionUs) throws ExoPlaybackException {
try {
if (positionUs == C.UNSET_TIME_US && mediaSource != null) {
MediaSource.Position defaultStartPosition =
mediaSource.getDefaultStartPosition(periodIndex);
if (defaultStartPosition != null) {
// We know the default position so seek to it now.
periodIndex = defaultStartPosition.periodIndex;
positionUs = defaultStartPosition.positionUs;
}
}
if (periodIndex == playbackInfo.periodIndex
&& ((positionUs == C.UNSET_TIME_US && playbackInfo.positionUs == C.UNSET_TIME_US)
|| ((positionUs / 1000) == (playbackInfo.positionUs / 1000)))) {
// Seek position equals the current position. Do nothing.
return;
}
seekToPeriodPosition(periodIndex, positionUs);
} finally {
eventHandler.sendEmptyMessage(MSG_SEEK_ACK);
}
}
private void seekToPeriodPosition(int periodIndex, long positionUs) throws ExoPlaybackException {
if (periodIndex != playbackInfo.periodIndex) {
playbackInfo = new PlaybackInfo(periodIndex);
playbackInfo.startPositionUs = positionUs;
playbackInfo.positionUs = positionUs;
eventHandler.obtainMessage(MSG_POSITION_DISCONTINUITY, playbackInfo).sendToTarget();
} else {
playbackInfo.startPositionUs = positionUs;
playbackInfo.positionUs = positionUs;
}
if (mediaSource == null) {
if (positionUs != C.UNSET_TIME_US) {
resetInternalPosition(positionUs);
}
return;
}
stopRenderers();
rebuffering = false;
setState(ExoPlayer.STATE_BUFFERING);
if (positionUs == C.UNSET_TIME_US
|| (readingPeriod != playingPeriod && (periodIndex == playingPeriod.index
|| (readingPeriod != null && periodIndex == readingPeriod.index)))) {
// Clear the timeline because either the seek position is not known, or a renderer is reading
// ahead to the next period and the seek is to either the playing or reading period.
periodIndex = Timeline.NO_PERIOD_INDEX;
}
// Clear the timeline, but keep the requested period if it is already prepared.
Period period = playingPeriod;
Period newPlayingPeriod = null;
while (period != null) {
if (period.index == periodIndex && period.prepared) {
newPlayingPeriod = period;
} else {
period.release();
}
period = period.nextPeriod;
}
// Disable all the renderers if the period is changing.
if (newPlayingPeriod != playingPeriod) {
for (Renderer renderer : enabledRenderers) {
renderer.disable();
}
enabledRenderers = new Renderer[0];
rendererMediaClock = null;
rendererMediaClockSource = null;
}
// Update loaded periods.
bufferAheadPeriodCount = 0;
if (newPlayingPeriod != null) {
newPlayingPeriod.nextPeriod = null;
setPlayingPeriod(newPlayingPeriod);
updateTimelineState();
readingPeriod = playingPeriod;
loadingPeriod = playingPeriod;
if (playingPeriod.hasEnabledTracks) {
positionUs = playingPeriod.mediaPeriod.seekToUs(positionUs);
playbackInfo.startPositionUs = positionUs;
playbackInfo.positionUs = positionUs;
}
resetInternalPosition(positionUs);
maybeContinueLoading();
} else {
playingPeriod = null;
readingPeriod = null;
loadingPeriod = null;
if (positionUs != C.UNSET_TIME_US) {
resetInternalPosition(positionUs);
}
}
updatePlaybackPositions();
handler.sendEmptyMessage(MSG_DO_SOME_WORK);
}
private void resetInternalPosition(long periodPositionUs) throws ExoPlaybackException {
long periodOffsetUs = playingPeriod == null ? 0 : playingPeriod.offsetUs;
internalPositionUs = periodOffsetUs + periodPositionUs;
standaloneMediaClock.setPositionUs(internalPositionUs);
for (Renderer renderer : enabledRenderers) {
renderer.resetPosition(internalPositionUs);
}
}
private void stopInternal() {
resetInternal();
setState(ExoPlayer.STATE_IDLE);
}
private void releaseInternal() {
resetInternal();
setState(ExoPlayer.STATE_IDLE);
synchronized (this) {
released = true;
notifyAll();
}
}
private void resetInternal() {
handler.removeMessages(MSG_DO_SOME_WORK);
rebuffering = false;
standaloneMediaClock.stop();
rendererMediaClock = null;
rendererMediaClockSource = null;
for (Renderer renderer : enabledRenderers) {
try {
ensureStopped(renderer);
renderer.disable();
} catch (ExoPlaybackException | RuntimeException e) {
// There's nothing we can do.
Log.e(TAG, "Stop failed.", e);
}
}
enabledRenderers = new Renderer[0];
if (mediaSource != null) {
mediaSource.releaseSource();
mediaSource = null;
}
releasePeriodsFrom(playingPeriod != null ? playingPeriod : loadingPeriod);
playingPeriodEndPositionUs = C.UNSET_TIME_US;
isTimelineReady = false;
isTimelineEnded = false;
playingPeriod = null;
readingPeriod = null;
loadingPeriod = null;
timeline = null;
bufferAheadPeriodCount = 0;
loadControl.reset();
setIsLoading(false);
}
private void sendMessagesInternal(ExoPlayerMessage[] messages) throws ExoPlaybackException {
try {
for (ExoPlayerMessage message : messages) {
message.target.handleMessage(message.messageType, message.message);
}
if (mediaSource != null) {
// The message may have caused something to change that now requires us to do work.
handler.sendEmptyMessage(MSG_DO_SOME_WORK);
}
} finally {
synchronized (this) {
customMessagesProcessed++;
notifyAll();
}
}
}
private void ensureStopped(Renderer renderer) throws ExoPlaybackException {
if (renderer.getState() == Renderer.STATE_STARTED) {
renderer.stop();
}
}
private void reselectTracksInternal() throws ExoPlaybackException {
if (playingPeriod == null) {
// We don't have tracks yet, so we don't care.
return;
}
// Reselect tracks on each period in turn, until the selection changes.
Period period = playingPeriod;
boolean selectionsChangedForReadPeriod = true;
while (true) {
if (period == null || !period.prepared) {
// The reselection did not change any prepared periods.
return;
}
if (period.selectTracks()) {
// Selected tracks have changed for this period.
break;
}
if (period == readingPeriod) {
// The track reselection didn't affect any period that has been read.
selectionsChangedForReadPeriod = false;
}
period = period.nextPeriod;
}
if (selectionsChangedForReadPeriod) {
// Release everything after the playing period because a renderer may have read data from a
// track whose selection has now changed.
releasePeriodsFrom(playingPeriod.nextPeriod);
playingPeriod.nextPeriod = null;
readingPeriod = playingPeriod;
loadingPeriod = playingPeriod;
playingPeriodEndPositionUs = C.UNSET_TIME_US;
bufferAheadPeriodCount = 0;
// Update streams for the new selection, recreating all streams if reading ahead.
boolean recreateStreams = readingPeriod != playingPeriod;
boolean[] streamResetFlags = new boolean[renderers.length];
long positionUs = playingPeriod.updatePeriodTrackSelection(playbackInfo.positionUs,
loadControl, recreateStreams, streamResetFlags);
if (positionUs != playbackInfo.positionUs) {
playbackInfo.positionUs = positionUs;
resetInternalPosition(positionUs);
}
int enabledRendererCount = 0;
boolean[] rendererWasEnabledFlags = new boolean[renderers.length];
for (int i = 0; i < renderers.length; i++) {
Renderer renderer = renderers[i];
rendererWasEnabledFlags[i] = renderer.getState() != Renderer.STATE_DISABLED;
SampleStream sampleStream = playingPeriod.sampleStreams[i];
if (sampleStream != null) {
enabledRendererCount++;
}
if (rendererWasEnabledFlags[i]) {
if (sampleStream != renderer.getStream()) {
// We need to disable the renderer.
if (renderer == rendererMediaClockSource) {
// The renderer is providing the media clock.
if (sampleStream == null) {
// The renderer won't be re-enabled. Sync standaloneMediaClock so that it can take
// over timing responsibilities.
standaloneMediaClock.setPositionUs(rendererMediaClock.getPositionUs());
}
rendererMediaClock = null;
rendererMediaClockSource = null;
}
ensureStopped(renderer);
renderer.disable();
} else if (streamResetFlags[i]) {
// The renderer will continue to consume from its current stream, but needs to be reset.
renderer.resetPosition(playbackInfo.positionUs);
}
}
}
trackSelector.onSelectionActivated(playingPeriod.trackSelectionData);
enableRenderers(rendererWasEnabledFlags, enabledRendererCount);
} else {
// Release and re-prepare/buffer periods after the one whose selection changed.
loadingPeriod = period;
period = loadingPeriod.nextPeriod;
while (period != null) {
period.release();
period = period.nextPeriod;
bufferAheadPeriodCount--;
}
loadingPeriod.nextPeriod = null;
long positionUs = Math.max(0, internalPositionUs - loadingPeriod.offsetUs);
loadingPeriod.updatePeriodTrackSelection(positionUs, loadControl, false);
}
maybeContinueLoading();
updatePlaybackPositions();
handler.sendEmptyMessage(MSG_DO_SOME_WORK);
}
public boolean haveSufficientBuffer(boolean rebuffering) {
if (loadingPeriod == null) {
return false;
}
long positionUs = internalPositionUs - loadingPeriod.offsetUs;
long bufferedPositionUs =
!loadingPeriod.prepared ? 0 : loadingPeriod.mediaPeriod.getBufferedPositionUs();
if (bufferedPositionUs == C.END_OF_SOURCE_US) {
if (loadingPeriod.isLast) {
return true;
}
bufferedPositionUs = timeline.getPeriodDurationUs(loadingPeriod.index);
}
return loadControl.shouldStartPlayback(bufferedPositionUs - positionUs, rebuffering);
}
public void maybeThrowPeriodPrepareError() throws IOException {
if (loadingPeriod != null && !loadingPeriod.prepared
&& (readingPeriod == null || readingPeriod.nextPeriod == loadingPeriod)) {
for (Renderer renderer : enabledRenderers) {
if (!renderer.hasReadStreamToEnd()) {
return;
}
}
loadingPeriod.mediaPeriod.maybeThrowPrepareError();
}
}
public void handleTimelineRefreshed(Timeline timeline) throws ExoPlaybackException, IOException {
Timeline oldTimeline = this.timeline;
this.timeline = timeline;
// Update the loaded periods to take into account the new timeline.
if (playingPeriod != null) {
int index = timeline.getIndexOfPeriod(playingPeriod.id);
if (index == Timeline.NO_PERIOD_INDEX) {
int newPlayingPeriodIndex =
mediaSource.getNewPlayingPeriodIndex(playingPeriod.index, oldTimeline);
if (newPlayingPeriodIndex == Timeline.NO_PERIOD_INDEX) {
// There is no period to play, so stop the player.
stopInternal();
return;
}
// Release all loaded periods and seek to the new playing period index.
releasePeriodsFrom(playingPeriod);
playingPeriod = null;
MediaSource.Position defaultStartPosition =
mediaSource.getDefaultStartPosition(newPlayingPeriodIndex);
if (defaultStartPosition != null) {
seekToPeriodPosition(defaultStartPosition.periodIndex, defaultStartPosition.positionUs);
} else {
seekToPeriodPosition(newPlayingPeriodIndex, C.UNSET_TIME_US);
}
return;
}
// The playing period is also in the new timeline. Update index and isLast on each loaded
// period until a period is found that has changed.
int periodCount = timeline.getPeriodCount();
playingPeriod.index = index;
playingPeriod.isLast = timeline.isFinal() && index == periodCount - 1;
Period previousPeriod = playingPeriod;
boolean seenReadingPeriod = false;
bufferAheadPeriodCount = 0;
while (previousPeriod.nextPeriod != null) {
Period period = previousPeriod.nextPeriod;
index++;
if (!period.id.equals(timeline.getPeriodId(index))) {
if (!seenReadingPeriod) {
// Renderers may have read a period that has been removed, so release all loaded periods
// and seek to the playing period index.
index = playingPeriod.index;
releasePeriodsFrom(playingPeriod);
playingPeriod = null;
seekToPeriodPosition(index, 0);
return;
}
// Update the loading period to be the latest period that is still valid.
loadingPeriod = previousPeriod;
loadingPeriod.nextPeriod = null;
// Release the rest of the timeline.
releasePeriodsFrom(period);
break;
}
bufferAheadPeriodCount++;
period.index = index;
period.isLast = timeline.isFinal() && index == periodCount - 1;
if (period == readingPeriod) {
seenReadingPeriod = true;
}
previousPeriod = period;
}
} else if (loadingPeriod != null) {
Object id = loadingPeriod.id;
int index = timeline.getIndexOfPeriod(id);
if (index == Timeline.NO_PERIOD_INDEX) {
loadingPeriod.release();
loadingPeriod = null;
bufferAheadPeriodCount = 0;
} else {
int periodCount = timeline.getPeriodCount();
loadingPeriod.index = index;
loadingPeriod.isLast = timeline.isFinal() && index == periodCount - 1;
}
}
// TODO[playlists]: Signal the identifier discontinuity, even if the index hasn't changed.
if (oldTimeline != null) {
int newPlayingIndex = playingPeriod != null ? playingPeriod.index
: loadingPeriod != null ? loadingPeriod.index : Timeline.NO_PERIOD_INDEX;
if (newPlayingIndex != Timeline.NO_PERIOD_INDEX
&& newPlayingIndex != playbackInfo.periodIndex) {
long oldPositionUs = playbackInfo.positionUs;
playbackInfo = new PlaybackInfo(newPlayingIndex);
playbackInfo.startPositionUs = oldPositionUs;
updatePlaybackPositions();
eventHandler.obtainMessage(MSG_POSITION_DISCONTINUITY, playbackInfo).sendToTarget();
}
}
}
public void updatePeriods() throws ExoPlaybackException, IOException {
if (timeline == null) {
// We're waiting to get information about periods.
mediaSource.maybeThrowSourceInfoRefreshError();
return;
}
// Update the loading period.
if (loadingPeriod == null || (loadingPeriod.isFullyBuffered() && !loadingPeriod.isLast
&& bufferAheadPeriodCount < MAXIMUM_BUFFER_AHEAD_PERIODS)) {
int periodIndex = loadingPeriod == null ? playbackInfo.periodIndex : loadingPeriod.index + 1;
long startPositionUs = playbackInfo.positionUs;
if (loadingPeriod != null || startPositionUs == C.UNSET_TIME_US) {
// We are starting to load the next period or seeking to the default position, so request a
// period and position from the source.
MediaSource.Position defaultStartPosition =
mediaSource.getDefaultStartPosition(periodIndex);
if (defaultStartPosition != null) {
periodIndex = defaultStartPosition.periodIndex;
startPositionUs = defaultStartPosition.positionUs;
} else {
startPositionUs = C.UNSET_TIME_US;
}
}
if (periodIndex >= timeline.getPeriodCount()) {
// This period is not available yet.
mediaSource.maybeThrowSourceInfoRefreshError();
} else if (startPositionUs != C.UNSET_TIME_US) {
MediaPeriod mediaPeriod = mediaSource.createPeriod(periodIndex, this,
loadControl.getAllocator(), startPositionUs);
Period newPeriod = new Period(renderers, rendererCapabilities, trackSelector, mediaSource,
mediaPeriod, timeline.getPeriodId(periodIndex), periodIndex, startPositionUs);
newPeriod.isLast = timeline.isFinal() && periodIndex == timeline.getPeriodCount() - 1;
if (loadingPeriod != null) {
loadingPeriod.setNextPeriod(newPeriod);
newPeriod.offsetUs = loadingPeriod.offsetUs
+ timeline.getPeriodDurationUs(loadingPeriod.index);
}
bufferAheadPeriodCount++;
loadingPeriod = newPeriod;
setIsLoading(true);
}
}
if (loadingPeriod == null || loadingPeriod.isFullyBuffered()) {
setIsLoading(false);
} else if (loadingPeriod != null && loadingPeriod.needsContinueLoading) {
maybeContinueLoading();
}
if (playingPeriod == null) {
// We're waiting for the first period to be prepared.
return;
}
// Update the playing and reading periods.
if (playingPeriodEndPositionUs == C.UNSET_TIME_US && playingPeriod.isFullyBuffered()) {
playingPeriodEndPositionUs = playingPeriod.offsetUs
+ timeline.getPeriodDurationUs(playingPeriod.index);
}
while (playingPeriod != readingPeriod && playingPeriod.nextPeriod != null
&& internalPositionUs >= playingPeriod.nextPeriod.offsetUs) {
// All enabled renderers' streams have been read to the end, and the playback position reached
// the end of the playing period, so advance playback to the next period.
playingPeriod.release();
setPlayingPeriod(playingPeriod.nextPeriod);
bufferAheadPeriodCount--;
playbackInfo = new PlaybackInfo(playingPeriod.index);
playbackInfo.startPositionUs = playingPeriod.startPositionUs;
updatePlaybackPositions();
eventHandler.obtainMessage(MSG_POSITION_DISCONTINUITY, playbackInfo).sendToTarget();
}
updateTimelineState();
if (readingPeriod == null) {
// The renderers have their final SampleStreams.
return;
}
for (Renderer renderer : enabledRenderers) {
if (!renderer.hasReadStreamToEnd()) {
return;
}
}
if (readingPeriod.nextPeriod != null && readingPeriod.nextPeriod.prepared) {
TrackSelectionArray oldTrackSelections = readingPeriod.trackSelections;
readingPeriod = readingPeriod.nextPeriod;
TrackSelectionArray newTrackSelections = readingPeriod.trackSelections;
for (int i = 0; i < renderers.length; i++) {
Renderer renderer = renderers[i];
TrackSelection oldSelection = oldTrackSelections.get(i);
TrackSelection newSelection = newTrackSelections.get(i);
if (oldSelection != null) {
if (newSelection != null) {
// Replace the renderer's SampleStream so the transition to playing the next period can
// be seamless.
Format[] formats = new Format[newSelection.length()];
for (int j = 0; j < formats.length; j++) {
formats[j] = newSelection.getFormat(j);
}
renderer.replaceStream(formats, readingPeriod.sampleStreams[i], readingPeriod.offsetUs);
} else {
// The renderer will be disabled when transitioning to playing the next period. Mark the
// SampleStream as final to play out any remaining data.
renderer.setCurrentStreamIsFinal();
}
}
}
} else if (readingPeriod.isLast) {
readingPeriod = null;
for (Renderer renderer : enabledRenderers) {
renderer.setCurrentStreamIsFinal();
}
}
}
public void handlePeriodPrepared(MediaPeriod period) throws ExoPlaybackException {
if (loadingPeriod == null || loadingPeriod.mediaPeriod != period) {
// Stale event.
return;
}
loadingPeriod.handlePrepared(loadingPeriod.startPositionUs, loadControl);
if (playingPeriod == null) {
// This is the first prepared period, so start playing it.
readingPeriod = loadingPeriod;
setPlayingPeriod(readingPeriod);
if (playbackInfo.startPositionUs == C.UNSET_TIME_US) {
// Update the playback info when seeking to a default position.
playbackInfo = new PlaybackInfo(playingPeriod.index);
playbackInfo.startPositionUs = playingPeriod.startPositionUs;
resetInternalPosition(playbackInfo.startPositionUs);
updatePlaybackPositions();
eventHandler.obtainMessage(MSG_POSITION_DISCONTINUITY, playbackInfo).sendToTarget();
}
updateTimelineState();
}
maybeContinueLoading();
}
public void handleContinueLoadingRequested(MediaPeriod period) {
if (loadingPeriod == null || loadingPeriod.mediaPeriod != period) {
return;
}
maybeContinueLoading();
}
private void maybeContinueLoading() {
long nextLoadPositionUs = loadingPeriod.mediaPeriod.getNextLoadPositionUs();
if (nextLoadPositionUs != C.END_OF_SOURCE_US) {
long positionUs = internalPositionUs - loadingPeriod.offsetUs;
long bufferedDurationUs = nextLoadPositionUs - positionUs;
boolean continueLoading = loadControl.shouldContinueLoading(bufferedDurationUs);
setIsLoading(continueLoading);
if (continueLoading) {
loadingPeriod.needsContinueLoading = false;
loadingPeriod.mediaPeriod.continueLoading(positionUs);
} else {
loadingPeriod.needsContinueLoading = true;
}
} else {
setIsLoading(false);
}
}
private void releasePeriodsFrom(Period period) {
while (period != null) {
period.release();
period = period.nextPeriod;
}
}
private void setPlayingPeriod(Period period) throws ExoPlaybackException {
int enabledRendererCount = 0;
boolean[] rendererWasEnabledFlags = new boolean[renderers.length];
for (int i = 0; i < renderers.length; i++) {
Renderer renderer = renderers[i];
rendererWasEnabledFlags[i] = renderer.getState() != Renderer.STATE_DISABLED;
TrackSelection newSelection = period.trackSelections.get(i);
if (newSelection != null) {
// The renderer should be enabled when playing the new period.
enabledRendererCount++;
} else if (rendererWasEnabledFlags[i]) {
// The renderer should be disabled when playing the new period.
if (renderer == rendererMediaClockSource) {
// Sync standaloneMediaClock so that it can take over timing responsibilities.
standaloneMediaClock.setPositionUs(rendererMediaClock.getPositionUs());
rendererMediaClock = null;
rendererMediaClockSource = null;
}
ensureStopped(renderer);
renderer.disable();
}
}
trackSelector.onSelectionActivated(period.trackSelectionData);
playingPeriod = period;
playingPeriodEndPositionUs = C.UNSET_TIME_US;
enableRenderers(rendererWasEnabledFlags, enabledRendererCount);
}
private void updateTimelineState() {
isTimelineReady = playingPeriodEndPositionUs == C.UNSET_TIME_US
|| internalPositionUs < playingPeriodEndPositionUs
|| (playingPeriod.nextPeriod != null && playingPeriod.nextPeriod.prepared);
isTimelineEnded = playingPeriod.isLast;
}
private void enableRenderers(boolean[] rendererWasEnabledFlags, int enabledRendererCount)
throws ExoPlaybackException {
enabledRenderers = new Renderer[enabledRendererCount];
enabledRendererCount = 0;
for (int i = 0; i < renderers.length; i++) {
Renderer renderer = renderers[i];
TrackSelection newSelection = playingPeriod.trackSelections.get(i);
if (newSelection != null) {
enabledRenderers[enabledRendererCount++] = renderer;
if (renderer.getState() == Renderer.STATE_DISABLED) {
// The renderer needs enabling with its new track selection.
boolean playing = playWhenReady && state == ExoPlayer.STATE_READY;
// Consider as joining only if the renderer was previously disabled.
boolean joining = !rendererWasEnabledFlags[i] && playing;
// Build an array of formats contained by the selection.
Format[] formats = new Format[newSelection.length()];
for (int j = 0; j < formats.length; j++) {
formats[j] = newSelection.getFormat(j);
}
// Enable the renderer.
renderer.enable(formats, playingPeriod.sampleStreams[i], internalPositionUs, joining,
playingPeriod.offsetUs);
MediaClock mediaClock = renderer.getMediaClock();
if (mediaClock != null) {
if (rendererMediaClock != null) {
throw ExoPlaybackException.createForUnexpected(
new IllegalStateException("Multiple renderer media clocks enabled."));
}
rendererMediaClock = mediaClock;
rendererMediaClockSource = renderer;
}
// Start the renderer if playing.
if (playing) {
renderer.start();
}
}
}
}
}
/**
* Represents a {@link MediaPeriod} with information required to play it as part of a timeline.
*/
private static final class Period {
public final MediaPeriod mediaPeriod;
public final Object id;
public final SampleStream[] sampleStreams;
public final boolean[] mayRetainStreamFlags;
public int index;
public long startPositionUs;
public boolean isLast;
public boolean prepared;
public boolean hasEnabledTracks;
public long offsetUs;
public Period nextPeriod;
public boolean needsContinueLoading;
private final Renderer[] renderers;
private final RendererCapabilities[] rendererCapabilities;
private final TrackSelector trackSelector;
private final MediaSource mediaSource;
private Object trackSelectionData;
private TrackSelectionArray trackSelections;
private TrackSelectionArray periodTrackSelections;
public Period(Renderer[] renderers, RendererCapabilities[] rendererCapabilities,
TrackSelector trackSelector, MediaSource mediaSource, MediaPeriod mediaPeriod, Object id,
int index, long positionUs) {
this.renderers = renderers;
this.rendererCapabilities = rendererCapabilities;
this.trackSelector = trackSelector;
this.mediaSource = mediaSource;
this.mediaPeriod = mediaPeriod;
this.id = Assertions.checkNotNull(id);
sampleStreams = new SampleStream[renderers.length];
mayRetainStreamFlags = new boolean[renderers.length];
startPositionUs = positionUs;
this.index = index;
}
public void setNextPeriod(Period nextPeriod) {
this.nextPeriod = nextPeriod;
}
public boolean isFullyBuffered() {
return prepared
&& (!hasEnabledTracks || mediaPeriod.getBufferedPositionUs() == C.END_OF_SOURCE_US);
}
public void handlePrepared(long positionUs, LoadControl loadControl)
throws ExoPlaybackException {
prepared = true;
selectTracks();
startPositionUs = updatePeriodTrackSelection(positionUs, loadControl, false);
}
public boolean selectTracks() throws ExoPlaybackException {
Pair<TrackSelectionArray, Object> result =
trackSelector.selectTracks(rendererCapabilities, mediaPeriod.getTrackGroups());
TrackSelectionArray newTrackSelections = result.first;
if (newTrackSelections.equals(periodTrackSelections)) {
return false;
}
trackSelections = newTrackSelections;
trackSelectionData = result.second;
return true;
}
public long updatePeriodTrackSelection(long positionUs, LoadControl loadControl,
boolean forceRecreateStreams) throws ExoPlaybackException {
return updatePeriodTrackSelection(positionUs, loadControl, forceRecreateStreams,
new boolean[renderers.length]);
}
public long updatePeriodTrackSelection(long positionUs, LoadControl loadControl,
boolean forceRecreateStreams, boolean[] streamResetFlags) throws ExoPlaybackException {
for (int i = 0; i < trackSelections.length; i++) {
mayRetainStreamFlags[i] = !forceRecreateStreams
&& Util.areEqual(periodTrackSelections == null ? null : periodTrackSelections.get(i),
trackSelections.get(i));
}
// Disable streams on the period and get new streams for updated/newly-enabled tracks.
positionUs = mediaPeriod.selectTracks(trackSelections.getAll(), mayRetainStreamFlags,
sampleStreams, streamResetFlags, positionUs);
periodTrackSelections = trackSelections;
hasEnabledTracks = false;
for (int i = 0; i < sampleStreams.length; i++) {
if (sampleStreams[i] != null) {
hasEnabledTracks = true;
break;
}
}
// The track selection has changed.
loadControl.onTrackSelections(renderers, mediaPeriod.getTrackGroups(), trackSelections);
return positionUs;
}
public void release() {
try {
mediaSource.releasePeriod(mediaPeriod);
} catch (RuntimeException e) {
// There's nothing we can do.
Log.e(TAG, "Period release failed.", e);
}
}
}
}
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