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gecko/content/media/MediaStreamGraph.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "MediaStreamGraphImpl.h"
#include "AudioSegment.h"
#include "VideoSegment.h"
#include "nsContentUtils.h"
#include "nsIAppShell.h"
#include "nsIObserver.h"
#include "nsServiceManagerUtils.h"
#include "nsWidgetsCID.h"
#include "nsXPCOMCIDInternal.h"
#include "prlog.h"
#include "VideoUtils.h"
#include "mozilla/Attributes.h"
#include "TrackUnionStream.h"
#include "ImageContainer.h"
#include "AudioChannelCommon.h"
#include "AudioNodeEngine.h"
#include "AudioNodeStream.h"
#include <algorithm>
using namespace mozilla::layers;
using namespace mozilla::dom;
namespace mozilla {
#ifdef PR_LOGGING
PRLogModuleInfo* gMediaStreamGraphLog;
#endif
/**
* The singleton graph instance.
*/
static MediaStreamGraphImpl* gGraph;
StreamTime
MediaStreamGraphImpl::GetDesiredBufferEnd(MediaStream* aStream)
{
StreamTime current = mCurrentTime - aStream->mBufferStartTime;
return current +
MillisecondsToMediaTime(std::max(AUDIO_TARGET_MS, VIDEO_TARGET_MS));
}
void
MediaStreamGraphImpl::FinishStream(MediaStream* aStream)
{
if (aStream->mFinished)
return;
LOG(PR_LOG_DEBUG, ("MediaStream %p will finish", aStream));
aStream->mFinished = true;
// Force at least one more iteration of the control loop, since we rely
// on UpdateCurrentTime to notify our listeners once the stream end
// has been reached.
EnsureNextIteration();
}
void
MediaStreamGraphImpl::AddStream(MediaStream* aStream)
{
aStream->mBufferStartTime = mCurrentTime;
*mStreams.AppendElement() = already_AddRefed<MediaStream>(aStream);
LOG(PR_LOG_DEBUG, ("Adding media stream %p to the graph", aStream));
}
void
MediaStreamGraphImpl::RemoveStream(MediaStream* aStream)
{
// Remove references in mStreamUpdates before we allow aStream to die.
// Pending updates are not needed (since the main thread has already given
// up the stream) so we will just drop them.
{
MonitorAutoLock lock(mMonitor);
for (uint32_t i = 0; i < mStreamUpdates.Length(); ++i) {
if (mStreamUpdates[i].mStream == aStream) {
mStreamUpdates[i].mStream = nullptr;
}
}
}
// This unrefs the stream, probably destroying it
mStreams.RemoveElement(aStream);
LOG(PR_LOG_DEBUG, ("Removing media stream %p from the graph", aStream));
}
void
MediaStreamGraphImpl::UpdateConsumptionState(SourceMediaStream* aStream)
{
MediaStreamListener::Consumption state =
aStream->mIsConsumed ? MediaStreamListener::CONSUMED
: MediaStreamListener::NOT_CONSUMED;
if (state != aStream->mLastConsumptionState) {
aStream->mLastConsumptionState = state;
for (uint32_t j = 0; j < aStream->mListeners.Length(); ++j) {
MediaStreamListener* l = aStream->mListeners[j];
l->NotifyConsumptionChanged(this, state);
}
}
}
void
MediaStreamGraphImpl::ExtractPendingInput(SourceMediaStream* aStream,
GraphTime aDesiredUpToTime,
bool* aEnsureNextIteration)
{
bool finished;
{
MutexAutoLock lock(aStream->mMutex);
if (aStream->mPullEnabled && !aStream->mFinished &&
!aStream->mListeners.IsEmpty()) {
// Compute how much stream time we'll need assuming we don't block
// the stream at all between mBlockingDecisionsMadeUntilTime and
// aDesiredUpToTime.
StreamTime t =
GraphTimeToStreamTime(aStream, mStateComputedTime) +
(aDesiredUpToTime - mStateComputedTime);
LOG(PR_LOG_DEBUG, ("Calling NotifyPull aStream=%p t=%f current end=%f", aStream,
MediaTimeToSeconds(t),
MediaTimeToSeconds(aStream->mBuffer.GetEnd())));
if (t > aStream->mBuffer.GetEnd()) {
*aEnsureNextIteration = true;
#ifdef DEBUG
if (aStream->mListeners.Length() == 0) {
LOG(PR_LOG_ERROR, ("No listeners in NotifyPull aStream=%p desired=%f current end=%f",
aStream, MediaTimeToSeconds(t),
MediaTimeToSeconds(aStream->mBuffer.GetEnd())));
aStream->DumpTrackInfo();
}
#endif
for (uint32_t j = 0; j < aStream->mListeners.Length(); ++j) {
MediaStreamListener* l = aStream->mListeners[j];
{
MutexAutoUnlock unlock(aStream->mMutex);
l->NotifyPull(this, t);
}
}
}
}
finished = aStream->mUpdateFinished;
for (int32_t i = aStream->mUpdateTracks.Length() - 1; i >= 0; --i) {
SourceMediaStream::TrackData* data = &aStream->mUpdateTracks[i];
for (uint32_t j = 0; j < aStream->mListeners.Length(); ++j) {
MediaStreamListener* l = aStream->mListeners[j];
TrackTicks offset = (data->mCommands & SourceMediaStream::TRACK_CREATE)
? data->mStart : aStream->mBuffer.FindTrack(data->mID)->GetSegment()->GetDuration();
l->NotifyQueuedTrackChanges(this, data->mID, data->mRate,
offset, data->mCommands, *data->mData);
}
if (data->mCommands & SourceMediaStream::TRACK_CREATE) {
MediaSegment* segment = data->mData.forget();
LOG(PR_LOG_DEBUG, ("SourceMediaStream %p creating track %d, rate %d, start %lld, initial end %lld",
aStream, data->mID, data->mRate, int64_t(data->mStart),
int64_t(segment->GetDuration())));
aStream->mBuffer.AddTrack(data->mID, data->mRate, data->mStart, segment);
// The track has taken ownership of data->mData, so let's replace
// data->mData with an empty clone.
data->mData = segment->CreateEmptyClone();
data->mCommands &= ~SourceMediaStream::TRACK_CREATE;
} else if (data->mData->GetDuration() > 0) {
MediaSegment* dest = aStream->mBuffer.FindTrack(data->mID)->GetSegment();
LOG(PR_LOG_DEBUG, ("SourceMediaStream %p track %d, advancing end from %lld to %lld",
aStream, data->mID,
int64_t(dest->GetDuration()),
int64_t(dest->GetDuration() + data->mData->GetDuration())));
dest->AppendFrom(data->mData);
}
if (data->mCommands & SourceMediaStream::TRACK_END) {
aStream->mBuffer.FindTrack(data->mID)->SetEnded();
aStream->mUpdateTracks.RemoveElementAt(i);
}
}
aStream->mBuffer.AdvanceKnownTracksTime(aStream->mUpdateKnownTracksTime);
}
if (aStream->mBuffer.GetEnd() > 0) {
aStream->mHasCurrentData = true;
}
if (finished) {
FinishStream(aStream);
}
}
void
MediaStreamGraphImpl::UpdateBufferSufficiencyState(SourceMediaStream* aStream)
{
StreamTime desiredEnd = GetDesiredBufferEnd(aStream);
nsTArray<SourceMediaStream::ThreadAndRunnable> runnables;
{
MutexAutoLock lock(aStream->mMutex);
for (uint32_t i = 0; i < aStream->mUpdateTracks.Length(); ++i) {
SourceMediaStream::TrackData* data = &aStream->mUpdateTracks[i];
if (data->mCommands & SourceMediaStream::TRACK_CREATE) {
// This track hasn't been created yet, so we have no sufficiency
// data. The track will be created in the next iteration of the
// control loop and then we'll fire insufficiency notifications
// if necessary.
continue;
}
if (data->mCommands & SourceMediaStream::TRACK_END) {
// This track will end, so no point in firing not-enough-data
// callbacks.
continue;
}
StreamBuffer::Track* track = aStream->mBuffer.FindTrack(data->mID);
// Note that track->IsEnded() must be false, otherwise we would have
// removed the track from mUpdateTracks already.
NS_ASSERTION(!track->IsEnded(), "What is this track doing here?");
data->mHaveEnough = track->GetEndTimeRoundDown() >= desiredEnd;
if (!data->mHaveEnough) {
runnables.MoveElementsFrom(data->mDispatchWhenNotEnough);
}
}
}
for (uint32_t i = 0; i < runnables.Length(); ++i) {
runnables[i].mThread->Dispatch(runnables[i].mRunnable, 0);
}
}
StreamTime
MediaStreamGraphImpl::GraphTimeToStreamTime(MediaStream* aStream,
GraphTime aTime)
{
NS_ASSERTION(aTime <= mStateComputedTime,
"Don't ask about times where we haven't made blocking decisions yet");
if (aTime <= mCurrentTime) {
return std::max<StreamTime>(0, aTime - aStream->mBufferStartTime);
}
GraphTime t = mCurrentTime;
StreamTime s = t - aStream->mBufferStartTime;
while (t < aTime) {
GraphTime end;
if (!aStream->mBlocked.GetAt(t, &end)) {
s += std::min(aTime, end) - t;
}
t = end;
}
return std::max<StreamTime>(0, s);
}
StreamTime
MediaStreamGraphImpl::GraphTimeToStreamTimeOptimistic(MediaStream* aStream,
GraphTime aTime)
{
GraphTime computedUpToTime = std::min(mStateComputedTime, aTime);
StreamTime s = GraphTimeToStreamTime(aStream, computedUpToTime);
return s + (aTime - computedUpToTime);
}
GraphTime
MediaStreamGraphImpl::StreamTimeToGraphTime(MediaStream* aStream,
StreamTime aTime, uint32_t aFlags)
{
if (aTime >= STREAM_TIME_MAX) {
return GRAPH_TIME_MAX;
}
MediaTime bufferElapsedToCurrentTime = mCurrentTime - aStream->mBufferStartTime;
if (aTime < bufferElapsedToCurrentTime ||
(aTime == bufferElapsedToCurrentTime && !(aFlags & INCLUDE_TRAILING_BLOCKED_INTERVAL))) {
return aTime + aStream->mBufferStartTime;
}
MediaTime streamAmount = aTime - bufferElapsedToCurrentTime;
NS_ASSERTION(streamAmount >= 0, "Can't answer queries before current time");
GraphTime t = mCurrentTime;
while (t < GRAPH_TIME_MAX) {
bool blocked;
GraphTime end;
if (t < mStateComputedTime) {
blocked = aStream->mBlocked.GetAt(t, &end);
end = std::min(end, mStateComputedTime);
} else {
blocked = false;
end = GRAPH_TIME_MAX;
}
if (blocked) {
t = end;
} else {
if (streamAmount == 0) {
// No more stream time to consume at time t, so we're done.
break;
}
MediaTime consume = std::min(end - t, streamAmount);
streamAmount -= consume;
t += consume;
}
}
return t;
}
GraphTime
MediaStreamGraphImpl::GetAudioPosition(MediaStream* aStream)
{
if (aStream->mAudioOutputStreams.IsEmpty()) {
return mCurrentTime;
}
int64_t positionInFrames = aStream->mAudioOutputStreams[0].mStream->GetPositionInFrames();
if (positionInFrames < 0) {
return mCurrentTime;
}
return aStream->mAudioOutputStreams[0].mAudioPlaybackStartTime +
TicksToTimeRoundDown(aStream->mAudioOutputStreams[0].mStream->GetRate(),
positionInFrames);
}
void
MediaStreamGraphImpl::UpdateCurrentTime()
{
GraphTime prevCurrentTime = mCurrentTime;
TimeStamp now = TimeStamp::Now();
GraphTime nextCurrentTime =
SecondsToMediaTime((now - mCurrentTimeStamp).ToSeconds()) + mCurrentTime;
if (mStateComputedTime < nextCurrentTime) {
LOG(PR_LOG_WARNING, ("Media graph global underrun detected"));
nextCurrentTime = mStateComputedTime;
}
mCurrentTimeStamp = now;
LOG(PR_LOG_DEBUG, ("Updating current time to %f (real %f, mStateComputedTime %f)",
MediaTimeToSeconds(nextCurrentTime),
(now - mInitialTimeStamp).ToSeconds(),
MediaTimeToSeconds(mStateComputedTime)));
if (prevCurrentTime >= nextCurrentTime) {
NS_ASSERTION(prevCurrentTime == nextCurrentTime, "Time can't go backwards!");
// This could happen due to low clock resolution, maybe?
LOG(PR_LOG_DEBUG, ("Time did not advance"));
// There's not much left to do here, but the code below that notifies
// listeners that streams have ended still needs to run.
}
for (uint32_t i = 0; i < mStreams.Length(); ++i) {
MediaStream* stream = mStreams[i];
// Calculate blocked time and fire Blocked/Unblocked events
GraphTime blockedTime = 0;
GraphTime t = prevCurrentTime;
while (t < nextCurrentTime) {
GraphTime end;
bool blocked = stream->mBlocked.GetAt(t, &end);
if (blocked) {
blockedTime += std::min(end, nextCurrentTime) - t;
}
if (blocked != stream->mNotifiedBlocked) {
for (uint32_t j = 0; j < stream->mListeners.Length(); ++j) {
MediaStreamListener* l = stream->mListeners[j];
l->NotifyBlockingChanged(this,
blocked ? MediaStreamListener::BLOCKED : MediaStreamListener::UNBLOCKED);
}
stream->mNotifiedBlocked = blocked;
}
t = end;
}
stream->AdvanceTimeVaryingValuesToCurrentTime(nextCurrentTime, blockedTime);
// Advance mBlocked last so that implementations of
// AdvanceTimeVaryingValuesToCurrentTime can rely on the value of mBlocked.
stream->mBlocked.AdvanceCurrentTime(nextCurrentTime);
if (blockedTime < nextCurrentTime - prevCurrentTime) {
for (uint32_t i = 0; i < stream->mListeners.Length(); ++i) {
MediaStreamListener* l = stream->mListeners[i];
l->NotifyOutput(this);
}
}
if (stream->mFinished && !stream->mNotifiedFinished &&
stream->mBufferStartTime + stream->GetBufferEnd() <= nextCurrentTime) {
stream->mNotifiedFinished = true;
stream->mLastPlayedVideoFrame.SetNull();
for (uint32_t j = 0; j < stream->mListeners.Length(); ++j) {
MediaStreamListener* l = stream->mListeners[j];
l->NotifyFinished(this);
}
}
LOG(PR_LOG_DEBUG, ("MediaStream %p bufferStartTime=%f blockedTime=%f",
stream, MediaTimeToSeconds(stream->mBufferStartTime),
MediaTimeToSeconds(blockedTime)));
}
mCurrentTime = nextCurrentTime;
}
bool
MediaStreamGraphImpl::WillUnderrun(MediaStream* aStream, GraphTime aTime,
GraphTime aEndBlockingDecisions, GraphTime* aEnd)
{
// Finished streams can't underrun. ProcessedMediaStreams also can't cause
// underrun currently, since we'll always be able to produce data for them
// unless they block on some other stream.
if (aStream->mFinished || aStream->AsProcessedStream()) {
return false;
}
GraphTime bufferEnd =
StreamTimeToGraphTime(aStream, aStream->GetBufferEnd(),
INCLUDE_TRAILING_BLOCKED_INTERVAL);
#ifdef DEBUG
if (bufferEnd < mCurrentTime) {
LOG(PR_LOG_ERROR, ("MediaStream %p underrun, "
"bufferEnd %f < mCurrentTime %f (%lld < %lld), Streamtime %lld",
aStream, MediaTimeToSeconds(bufferEnd), MediaTimeToSeconds(mCurrentTime),
bufferEnd, mCurrentTime, aStream->GetBufferEnd()));
aStream->DumpTrackInfo();
NS_ASSERTION(bufferEnd >= mCurrentTime, "Buffer underran");
}
#endif
// We should block after bufferEnd.
if (bufferEnd <= aTime) {
LOG(PR_LOG_DEBUG, ("MediaStream %p will block due to data underrun, "
"bufferEnd %f",
aStream, MediaTimeToSeconds(bufferEnd)));
return true;
}
// We should keep blocking if we're currently blocked and we don't have
// data all the way through to aEndBlockingDecisions. If we don't have
// data all the way through to aEndBlockingDecisions, we'll block soon,
// but we might as well remain unblocked and play the data we've got while
// we can.
if (bufferEnd <= aEndBlockingDecisions && aStream->mBlocked.GetBefore(aTime)) {
LOG(PR_LOG_DEBUG, ("MediaStream %p will block due to speculative data underrun, "
"bufferEnd %f",
aStream, MediaTimeToSeconds(bufferEnd)));
return true;
}
// Reconsider decisions at bufferEnd
*aEnd = std::min(*aEnd, bufferEnd);
return false;
}
void
MediaStreamGraphImpl::MarkConsumed(MediaStream* aStream)
{
if (aStream->mIsConsumed) {
return;
}
aStream->mIsConsumed = true;
ProcessedMediaStream* ps = aStream->AsProcessedStream();
if (!ps) {
return;
}
// Mark all the inputs to this stream as consumed
for (uint32_t i = 0; i < ps->mInputs.Length(); ++i) {
MarkConsumed(ps->mInputs[i]->mSource);
}
}
void
MediaStreamGraphImpl::UpdateStreamOrderForStream(nsTArray<MediaStream*>* aStack,
already_AddRefed<MediaStream> aStream)
{
nsRefPtr<MediaStream> stream = aStream;
NS_ASSERTION(!stream->mHasBeenOrdered, "stream should not have already been ordered");
if (stream->mIsOnOrderingStack) {
for (int32_t i = aStack->Length() - 1; ; --i) {
aStack->ElementAt(i)->AsProcessedStream()->mInCycle = true;
if (aStack->ElementAt(i) == stream)
break;
}
return;
}
ProcessedMediaStream* ps = stream->AsProcessedStream();
if (ps) {
aStack->AppendElement(stream);
stream->mIsOnOrderingStack = true;
for (uint32_t i = 0; i < ps->mInputs.Length(); ++i) {
MediaStream* source = ps->mInputs[i]->mSource;
if (!source->mHasBeenOrdered) {
nsRefPtr<MediaStream> s = source;
UpdateStreamOrderForStream(aStack, s.forget());
}
}
aStack->RemoveElementAt(aStack->Length() - 1);
stream->mIsOnOrderingStack = false;
}
stream->mHasBeenOrdered = true;
*mStreams.AppendElement() = stream.forget();
}
void
MediaStreamGraphImpl::UpdateStreamOrder()
{
nsTArray<nsRefPtr<MediaStream> > oldStreams;
oldStreams.SwapElements(mStreams);
for (uint32_t i = 0; i < oldStreams.Length(); ++i) {
MediaStream* stream = oldStreams[i];
stream->mHasBeenOrdered = false;
stream->mIsConsumed = false;
stream->mIsOnOrderingStack = false;
stream->mInBlockingSet = false;
ProcessedMediaStream* ps = stream->AsProcessedStream();
if (ps) {
ps->mInCycle = false;
}
}
nsAutoTArray<MediaStream*,10> stack;
for (uint32_t i = 0; i < oldStreams.Length(); ++i) {
nsRefPtr<MediaStream>& s = oldStreams[i];
if (!s->mAudioOutputs.IsEmpty() || !s->mVideoOutputs.IsEmpty()) {
MarkConsumed(s);
}
if (!s->mHasBeenOrdered) {
UpdateStreamOrderForStream(&stack, s.forget());
}
}
}
void
MediaStreamGraphImpl::RecomputeBlocking(GraphTime aEndBlockingDecisions)
{
bool blockingDecisionsWillChange = false;
LOG(PR_LOG_DEBUG, ("Media graph %p computing blocking for time %f",
this, MediaTimeToSeconds(mStateComputedTime)));
for (uint32_t i = 0; i < mStreams.Length(); ++i) {
MediaStream* stream = mStreams[i];
if (!stream->mInBlockingSet) {
// Compute a partition of the streams containing 'stream' such that we can
// compute the blocking status of each subset independently.
nsAutoTArray<MediaStream*,10> streamSet;
AddBlockingRelatedStreamsToSet(&streamSet, stream);
GraphTime end;
for (GraphTime t = mStateComputedTime;
t < aEndBlockingDecisions; t = end) {
end = GRAPH_TIME_MAX;
RecomputeBlockingAt(streamSet, t, aEndBlockingDecisions, &end);
if (end < GRAPH_TIME_MAX) {
blockingDecisionsWillChange = true;
}
}
}
GraphTime end;
stream->mBlocked.GetAt(mCurrentTime, &end);
if (end < GRAPH_TIME_MAX) {
blockingDecisionsWillChange = true;
}
}
LOG(PR_LOG_DEBUG, ("Media graph %p computed blocking for interval %f to %f",
this, MediaTimeToSeconds(mStateComputedTime),
MediaTimeToSeconds(aEndBlockingDecisions)));
mStateComputedTime = aEndBlockingDecisions;
if (blockingDecisionsWillChange) {
// Make sure we wake up to notify listeners about these changes.
EnsureNextIteration();
}
}
void
MediaStreamGraphImpl::AddBlockingRelatedStreamsToSet(nsTArray<MediaStream*>* aStreams,
MediaStream* aStream)
{
if (aStream->mInBlockingSet)
return;
aStream->mInBlockingSet = true;
aStreams->AppendElement(aStream);
for (uint32_t i = 0; i < aStream->mConsumers.Length(); ++i) {
MediaInputPort* port = aStream->mConsumers[i];
if (port->mFlags & (MediaInputPort::FLAG_BLOCK_INPUT | MediaInputPort::FLAG_BLOCK_OUTPUT)) {
AddBlockingRelatedStreamsToSet(aStreams, port->mDest);
}
}
ProcessedMediaStream* ps = aStream->AsProcessedStream();
if (ps) {
for (uint32_t i = 0; i < ps->mInputs.Length(); ++i) {
MediaInputPort* port = ps->mInputs[i];
if (port->mFlags & (MediaInputPort::FLAG_BLOCK_INPUT | MediaInputPort::FLAG_BLOCK_OUTPUT)) {
AddBlockingRelatedStreamsToSet(aStreams, port->mSource);
}
}
}
}
void
MediaStreamGraphImpl::MarkStreamBlocking(MediaStream* aStream)
{
if (aStream->mBlockInThisPhase)
return;
aStream->mBlockInThisPhase = true;
for (uint32_t i = 0; i < aStream->mConsumers.Length(); ++i) {
MediaInputPort* port = aStream->mConsumers[i];
if (port->mFlags & MediaInputPort::FLAG_BLOCK_OUTPUT) {
MarkStreamBlocking(port->mDest);
}
}
ProcessedMediaStream* ps = aStream->AsProcessedStream();
if (ps) {
for (uint32_t i = 0; i < ps->mInputs.Length(); ++i) {
MediaInputPort* port = ps->mInputs[i];
if (port->mFlags & MediaInputPort::FLAG_BLOCK_INPUT) {
MarkStreamBlocking(port->mSource);
}
}
}
}
void
MediaStreamGraphImpl::RecomputeBlockingAt(const nsTArray<MediaStream*>& aStreams,
GraphTime aTime,
GraphTime aEndBlockingDecisions,
GraphTime* aEnd)
{
for (uint32_t i = 0; i < aStreams.Length(); ++i) {
MediaStream* stream = aStreams[i];
stream->mBlockInThisPhase = false;
}
for (uint32_t i = 0; i < aStreams.Length(); ++i) {
MediaStream* stream = aStreams[i];
if (stream->mFinished) {
GraphTime endTime = StreamTimeToGraphTime(stream, stream->GetBufferEnd());
if (endTime <= aTime) {
LOG(PR_LOG_DEBUG, ("MediaStream %p is blocked due to being finished", stream));
// We'll block indefinitely
MarkStreamBlocking(stream);
*aEnd = aEndBlockingDecisions;
continue;
} else {
LOG(PR_LOG_DEBUG, ("MediaStream %p is finished, but not blocked yet (end at %f, with blocking at %f)",
stream, MediaTimeToSeconds(stream->GetBufferEnd()),
MediaTimeToSeconds(endTime)));
*aEnd = std::min(*aEnd, endTime);
}
}
GraphTime end;
bool explicitBlock = stream->mExplicitBlockerCount.GetAt(aTime, &end) > 0;
*aEnd = std::min(*aEnd, end);
if (explicitBlock) {
LOG(PR_LOG_DEBUG, ("MediaStream %p is blocked due to explicit blocker", stream));
MarkStreamBlocking(stream);
continue;
}
bool underrun = WillUnderrun(stream, aTime, aEndBlockingDecisions, aEnd);
if (underrun) {
// We'll block indefinitely
MarkStreamBlocking(stream);
*aEnd = aEndBlockingDecisions;
continue;
}
}
NS_ASSERTION(*aEnd > aTime, "Failed to advance!");
for (uint32_t i = 0; i < aStreams.Length(); ++i) {
MediaStream* stream = aStreams[i];
stream->mBlocked.SetAtAndAfter(aTime, stream->mBlockInThisPhase);
}
}
void
MediaStreamGraphImpl::NotifyHasCurrentData(MediaStream* aStream)
{
if (!aStream->mNotifiedHasCurrentData && aStream->mHasCurrentData) {
for (uint32_t j = 0; j < aStream->mListeners.Length(); ++j) {
MediaStreamListener* l = aStream->mListeners[j];
l->NotifyHasCurrentData(this);
}
aStream->mNotifiedHasCurrentData = true;
}
}
void
MediaStreamGraphImpl::CreateOrDestroyAudioStreams(GraphTime aAudioOutputStartTime,
MediaStream* aStream)
{
nsAutoTArray<bool,2> audioOutputStreamsFound;
for (uint32_t i = 0; i < aStream->mAudioOutputStreams.Length(); ++i) {
audioOutputStreamsFound.AppendElement(false);
}
if (!aStream->mAudioOutputs.IsEmpty()) {
for (StreamBuffer::TrackIter tracks(aStream->GetStreamBuffer(), MediaSegment::AUDIO);
!tracks.IsEnded(); tracks.Next()) {
uint32_t i;
for (i = 0; i < audioOutputStreamsFound.Length(); ++i) {
if (aStream->mAudioOutputStreams[i].mTrackID == tracks->GetID()) {
break;
}
}
if (i < audioOutputStreamsFound.Length()) {
audioOutputStreamsFound[i] = true;
} else {
// No output stream created for this track yet. Check if it's time to
// create one.
GraphTime startTime =
StreamTimeToGraphTime(aStream, tracks->GetStartTimeRoundDown(),
INCLUDE_TRAILING_BLOCKED_INTERVAL);
if (startTime >= mStateComputedTime) {
// The stream wants to play audio, but nothing will play for the forseeable
// future, so don't create the stream.
continue;
}
// XXX allocating a AudioStream could be slow so we're going to have to do
// something here ... preallocation, async allocation, multiplexing onto a single
// stream ...
MediaStream::AudioOutputStream* audioOutputStream =
aStream->mAudioOutputStreams.AppendElement();
audioOutputStream->mAudioPlaybackStartTime = aAudioOutputStartTime;
audioOutputStream->mBlockedAudioTime = 0;
audioOutputStream->mStream = AudioStream::AllocateStream();
// XXX for now, allocate stereo output. But we need to fix this to
// match the system's ideal channel configuration.
audioOutputStream->mStream->Init(2, tracks->GetRate(), AUDIO_CHANNEL_NORMAL);
audioOutputStream->mTrackID = tracks->GetID();
}
}
}
for (int32_t i = audioOutputStreamsFound.Length() - 1; i >= 0; --i) {
if (!audioOutputStreamsFound[i]) {
aStream->mAudioOutputStreams[i].mStream->Shutdown();
aStream->mAudioOutputStreams.RemoveElementAt(i);
}
}
}
void
MediaStreamGraphImpl::PlayAudio(MediaStream* aStream,
GraphTime aFrom, GraphTime aTo)
{
if (aStream->mAudioOutputStreams.IsEmpty()) {
return;
}
// When we're playing multiple copies of this stream at the same time, they're
// perfectly correlated so adding volumes is the right thing to do.
float volume = 0.0f;
for (uint32_t i = 0; i < aStream->mAudioOutputs.Length(); ++i) {
volume += aStream->mAudioOutputs[i].mVolume;
}
for (uint32_t i = 0; i < aStream->mAudioOutputStreams.Length(); ++i) {
MediaStream::AudioOutputStream& audioOutput = aStream->mAudioOutputStreams[i];
StreamBuffer::Track* track = aStream->mBuffer.FindTrack(audioOutput.mTrackID);
AudioSegment* audio = track->Get<AudioSegment>();
// We don't update aStream->mBufferStartTime here to account for
// time spent blocked. Instead, we'll update it in UpdateCurrentTime after the
// blocked period has completed. But we do need to make sure we play from the
// right offsets in the stream buffer, even if we've already written silence for
// some amount of blocked time after the current time.
GraphTime t = aFrom;
while (t < aTo) {
GraphTime end;
bool blocked = aStream->mBlocked.GetAt(t, &end);
end = std::min(end, aTo);
AudioSegment output;
if (blocked) {
// Track total blocked time in aStream->mBlockedAudioTime so that
// the amount of silent samples we've inserted for blocking never gets
// more than one sample away from the ideal amount.
TrackTicks startTicks =
TimeToTicksRoundDown(track->GetRate(), audioOutput.mBlockedAudioTime);
audioOutput.mBlockedAudioTime += end - t;
TrackTicks endTicks =
TimeToTicksRoundDown(track->GetRate(), audioOutput.mBlockedAudioTime);
output.InsertNullDataAtStart(endTicks - startTicks);
LOG(PR_LOG_DEBUG, ("MediaStream %p writing blocking-silence samples for %f to %f",
aStream, MediaTimeToSeconds(t), MediaTimeToSeconds(end)));
} else {
TrackTicks startTicks =
track->TimeToTicksRoundDown(GraphTimeToStreamTime(aStream, t));
TrackTicks endTicks =
track->TimeToTicksRoundDown(GraphTimeToStreamTime(aStream, end));
// If startTicks is before the track start, then that part of 'audio'
// will just be silence, which is fine here. But if endTicks is after
// the track end, then 'audio' won't be long enough, so we'll need
// to explicitly play silence.
TrackTicks sliceEnd = std::min(endTicks, audio->GetDuration());
if (sliceEnd > startTicks) {
output.AppendSlice(*audio, startTicks, sliceEnd);
}
// Play silence where the track has ended
output.AppendNullData(endTicks - sliceEnd);
NS_ASSERTION(endTicks == sliceEnd || track->IsEnded(),
"Ran out of data but track not ended?");
output.ApplyVolume(volume);
LOG(PR_LOG_DEBUG, ("MediaStream %p writing samples for %f to %f (samples %lld to %lld)",
aStream, MediaTimeToSeconds(t), MediaTimeToSeconds(end),
startTicks, endTicks));
}
output.WriteTo(audioOutput.mStream);
t = end;
}
}
}
void
MediaStreamGraphImpl::PlayVideo(MediaStream* aStream)
{
if (aStream->mVideoOutputs.IsEmpty())
return;
// Display the next frame a bit early. This is better than letting the current
// frame be displayed for too long.
GraphTime framePosition = mCurrentTime + MEDIA_GRAPH_TARGET_PERIOD_MS;
NS_ASSERTION(framePosition >= aStream->mBufferStartTime, "frame position before buffer?");
StreamTime frameBufferTime = GraphTimeToStreamTime(aStream, framePosition);
TrackTicks start;
const VideoFrame* frame = nullptr;
StreamBuffer::Track* track;
for (StreamBuffer::TrackIter tracks(aStream->GetStreamBuffer(), MediaSegment::VIDEO);
!tracks.IsEnded(); tracks.Next()) {
VideoSegment* segment = tracks->Get<VideoSegment>();
TrackTicks thisStart;
const VideoFrame* thisFrame =
segment->GetFrameAt(tracks->TimeToTicksRoundDown(frameBufferTime), &thisStart);
if (thisFrame && thisFrame->GetImage()) {
start = thisStart;
frame = thisFrame;
track = tracks.get();
}
}
if (!frame || *frame == aStream->mLastPlayedVideoFrame)
return;
LOG(PR_LOG_DEBUG, ("MediaStream %p writing video frame %p (%dx%d)",
aStream, frame->GetImage(), frame->GetIntrinsicSize().width,
frame->GetIntrinsicSize().height));
GraphTime startTime = StreamTimeToGraphTime(aStream,
track->TicksToTimeRoundDown(start), INCLUDE_TRAILING_BLOCKED_INTERVAL);
TimeStamp targetTime = mCurrentTimeStamp +
TimeDuration::FromMilliseconds(double(startTime - mCurrentTime));
for (uint32_t i = 0; i < aStream->mVideoOutputs.Length(); ++i) {
VideoFrameContainer* output = aStream->mVideoOutputs[i];
output->SetCurrentFrame(frame->GetIntrinsicSize(), frame->GetImage(),
targetTime);
nsCOMPtr<nsIRunnable> event =
NS_NewRunnableMethod(output, &VideoFrameContainer::Invalidate);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
}
if (!aStream->mNotifiedFinished) {
aStream->mLastPlayedVideoFrame = *frame;
}
}
void
MediaStreamGraphImpl::PrepareUpdatesToMainThreadState()
{
mMonitor.AssertCurrentThreadOwns();
for (uint32_t i = 0; i < mStreams.Length(); ++i) {
MediaStream* stream = mStreams[i];
StreamUpdate* update = mStreamUpdates.AppendElement();
update->mGraphUpdateIndex = stream->mGraphUpdateIndices.GetAt(mCurrentTime);
update->mStream = stream;
update->mNextMainThreadCurrentTime =
GraphTimeToStreamTime(stream, mCurrentTime);
update->mNextMainThreadFinished =
stream->mFinished &&
StreamTimeToGraphTime(stream, stream->GetBufferEnd()) <= mCurrentTime;
}
mUpdateRunnables.MoveElementsFrom(mPendingUpdateRunnables);
EnsureStableStateEventPosted();
}
void
MediaStreamGraphImpl::EnsureImmediateWakeUpLocked(MonitorAutoLock& aLock)
{
if (mWaitState == WAITSTATE_WAITING_FOR_NEXT_ITERATION ||
mWaitState == WAITSTATE_WAITING_INDEFINITELY) {
mWaitState = WAITSTATE_WAKING_UP;
aLock.Notify();
}
}
void
MediaStreamGraphImpl::EnsureNextIteration()
{
MonitorAutoLock lock(mMonitor);
EnsureNextIterationLocked(lock);
}
void
MediaStreamGraphImpl::EnsureNextIterationLocked(MonitorAutoLock& aLock)
{
if (mNeedAnotherIteration)
return;
mNeedAnotherIteration = true;
if (mWaitState == WAITSTATE_WAITING_INDEFINITELY) {
mWaitState = WAITSTATE_WAKING_UP;
aLock.Notify();
}
}
static GraphTime
RoundUpToAudioBlock(GraphTime aTime)
{
TrackRate rate = IdealAudioRate();
int64_t ticksAtIdealRate = (aTime*rate) >> MEDIA_TIME_FRAC_BITS;
// Round up to nearest block boundary
int64_t blocksAtIdealRate =
(ticksAtIdealRate + (WEBAUDIO_BLOCK_SIZE - 1)) >>
WEBAUDIO_BLOCK_SIZE_BITS;
// Round up to nearest MediaTime unit
return
((((blocksAtIdealRate + 1)*WEBAUDIO_BLOCK_SIZE) << MEDIA_TIME_FRAC_BITS)
+ rate - 1)/rate;
}
void
MediaStreamGraphImpl::ProduceDataForStreamsBlockByBlock(uint32_t aStreamIndex,
GraphTime aFrom,
GraphTime aTo)
{
GraphTime t = aFrom;
while (t < aTo) {
GraphTime next = RoundUpToAudioBlock(t + 1);
for (uint32_t i = aStreamIndex; i < mStreams.Length(); ++i) {
ProcessedMediaStream* ps = mStreams[i]->AsProcessedStream();
if (ps) {
ps->ProduceOutput(t, next);
}
}
t = next;
}
NS_ASSERTION(t == aTo, "Something went wrong with rounding to block boundaries");
}
void
MediaStreamGraphImpl::RunThread()
{
nsTArray<MessageBlock> messageQueue;
{
MonitorAutoLock lock(mMonitor);
messageQueue.SwapElements(mMessageQueue);
}
NS_ASSERTION(!messageQueue.IsEmpty(),
"Shouldn't have started a graph with empty message queue!");
for (;;) {
// Update mCurrentTime to the min of the playing audio times, or using the
// wall-clock time change if no audio is playing.
UpdateCurrentTime();
// Calculate independent action times for each batch of messages (each
// batch corresponding to an event loop task). This isolates the performance
// of different scripts to some extent.
for (uint32_t i = 0; i < messageQueue.Length(); ++i) {
mProcessingGraphUpdateIndex = messageQueue[i].mGraphUpdateIndex;
nsTArray<nsAutoPtr<ControlMessage> >& messages = messageQueue[i].mMessages;
for (uint32_t j = 0; j < messages.Length(); ++j) {
messages[j]->Run();
}
}
messageQueue.Clear();
UpdateStreamOrder();
GraphTime endBlockingDecisions =
RoundUpToAudioBlock(mCurrentTime + MillisecondsToMediaTime(AUDIO_TARGET_MS));
bool ensureNextIteration = false;
// Grab pending stream input.
for (uint32_t i = 0; i < mStreams.Length(); ++i) {
SourceMediaStream* is = mStreams[i]->AsSourceStream();
if (is) {
UpdateConsumptionState(is);
ExtractPendingInput(is, endBlockingDecisions, &ensureNextIteration);
}
}
// Figure out which streams are blocked and when.
GraphTime prevComputedTime = mStateComputedTime;
RecomputeBlocking(endBlockingDecisions);
// Play stream contents.
uint32_t audioStreamsActive = 0;
bool allBlockedForever = true;
// True when we've done ProduceOutput for all processed streams.
bool doneAllProducing = false;
// Figure out what each stream wants to do
for (uint32_t i = 0; i < mStreams.Length(); ++i) {
MediaStream* stream = mStreams[i];
if (!doneAllProducing && !stream->IsFinishedOnGraphThread()) {
ProcessedMediaStream* ps = stream->AsProcessedStream();
if (ps) {
AudioNodeStream* n = stream->AsAudioNodeStream();
if (n) {
// Since an AudioNodeStream is present, go ahead and
// produce audio block by block for all the rest of the streams.
ProduceDataForStreamsBlockByBlock(i, prevComputedTime, mStateComputedTime);
doneAllProducing = true;
} else {
ps->ProduceOutput(prevComputedTime, mStateComputedTime);
NS_ASSERTION(stream->mBuffer.GetEnd() >=
GraphTimeToStreamTime(stream, mStateComputedTime),
"Stream did not produce enough data");
}
}
}
NotifyHasCurrentData(stream);
CreateOrDestroyAudioStreams(prevComputedTime, stream);
PlayAudio(stream, prevComputedTime, mStateComputedTime);
audioStreamsActive += stream->mAudioOutputStreams.Length();
PlayVideo(stream);
SourceMediaStream* is = stream->AsSourceStream();
if (is) {
UpdateBufferSufficiencyState(is);
}
GraphTime end;
if (!stream->mBlocked.GetAt(mCurrentTime, &end) || end < GRAPH_TIME_MAX) {
allBlockedForever = false;
}
}
if (ensureNextIteration || !allBlockedForever || audioStreamsActive > 0) {
EnsureNextIteration();
}
// Send updates to the main thread and wait for the next control loop
// iteration.
{
// Not using MonitorAutoLock since we need to unlock in a way
// that doesn't match lexical scopes.
MonitorAutoLock lock(mMonitor);
PrepareUpdatesToMainThreadState();
if (mForceShutDown || (IsEmpty() && mMessageQueue.IsEmpty())) {
// Enter shutdown mode. The stable-state handler will detect this
// and complete shutdown. Destroy any streams immediately.
LOG(PR_LOG_DEBUG, ("MediaStreamGraph %p waiting for main thread cleanup", this));
// Commit to shutting down this graph object.
mLifecycleState = LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP;
// No need to Destroy streams here. The main-thread owner of each
// stream is responsible for calling Destroy them.
return;
}
PRIntervalTime timeout = PR_INTERVAL_NO_TIMEOUT;
TimeStamp now = TimeStamp::Now();
if (mNeedAnotherIteration) {
int64_t timeoutMS = MEDIA_GRAPH_TARGET_PERIOD_MS -
int64_t((now - mCurrentTimeStamp).ToMilliseconds());
// Make sure timeoutMS doesn't overflow 32 bits by waking up at
// least once a minute, if we need to wake up at all
timeoutMS = std::max<int64_t>(0, std::min<int64_t>(timeoutMS, 60*1000));
timeout = PR_MillisecondsToInterval(uint32_t(timeoutMS));
LOG(PR_LOG_DEBUG, ("Waiting for next iteration; at %f, timeout=%f",
(now - mInitialTimeStamp).ToSeconds(), timeoutMS/1000.0));
mWaitState = WAITSTATE_WAITING_FOR_NEXT_ITERATION;
} else {
mWaitState = WAITSTATE_WAITING_INDEFINITELY;
}
if (timeout > 0) {
mMonitor.Wait(timeout);
LOG(PR_LOG_DEBUG, ("Resuming after timeout; at %f, elapsed=%f",
(TimeStamp::Now() - mInitialTimeStamp).ToSeconds(),
(TimeStamp::Now() - now).ToSeconds()));
}
mWaitState = WAITSTATE_RUNNING;
mNeedAnotherIteration = false;
messageQueue.SwapElements(mMessageQueue);
}
}
}
void
MediaStreamGraphImpl::ApplyStreamUpdate(StreamUpdate* aUpdate)
{
mMonitor.AssertCurrentThreadOwns();
MediaStream* stream = aUpdate->mStream;
if (!stream)
return;
stream->mMainThreadCurrentTime = aUpdate->mNextMainThreadCurrentTime;
stream->mMainThreadFinished = aUpdate->mNextMainThreadFinished;
for (int32_t i = stream->mMainThreadListeners.Length() - 1; i >= 0; --i) {
stream->mMainThreadListeners[i]->NotifyMainThreadStateChanged();
}
}
void
MediaStreamGraphImpl::ShutdownThreads()
{
NS_ASSERTION(NS_IsMainThread(), "Must be called on main thread");
// mGraph's thread is not running so it's OK to do whatever here
LOG(PR_LOG_DEBUG, ("Stopping threads for MediaStreamGraph %p", this));
if (mThread) {
mThread->Shutdown();
mThread = nullptr;
}
}
void
MediaStreamGraphImpl::ForceShutDown()
{
NS_ASSERTION(NS_IsMainThread(), "Must be called on main thread");
LOG(PR_LOG_DEBUG, ("MediaStreamGraph %p ForceShutdown", this));
{
MonitorAutoLock lock(mMonitor);
mForceShutDown = true;
EnsureImmediateWakeUpLocked(lock);
}
}
namespace {
class MediaStreamGraphThreadRunnable : public nsRunnable {
public:
explicit MediaStreamGraphThreadRunnable(MediaStreamGraphImpl* aGraph)
: mGraph(aGraph)
{
}
NS_IMETHOD Run()
{
mGraph->RunThread();
return NS_OK;
}
private:
MediaStreamGraphImpl* mGraph;
};
class MediaStreamGraphShutDownRunnable : public nsRunnable {
public:
MediaStreamGraphShutDownRunnable(MediaStreamGraphImpl* aGraph) : mGraph(aGraph) {}
NS_IMETHOD Run()
{
NS_ASSERTION(mGraph->mDetectedNotRunning,
"We should know the graph thread control loop isn't running!");
// mGraph's thread is not running so it's OK to do whatever here
if (mGraph->IsEmpty()) {
// mGraph is no longer needed, so delete it. If the graph is not empty
// then we must be in a forced shutdown and some later AppendMessage will
// detect that the manager has been emptied, and delete it.
delete mGraph;
} else {
NS_ASSERTION(mGraph->mForceShutDown, "Not in forced shutdown?");
mGraph->mLifecycleState =
MediaStreamGraphImpl::LIFECYCLE_WAITING_FOR_STREAM_DESTRUCTION;
}
return NS_OK;
}
private:
MediaStreamGraphImpl* mGraph;
};
class MediaStreamGraphStableStateRunnable : public nsRunnable {
public:
explicit MediaStreamGraphStableStateRunnable(MediaStreamGraphImpl* aGraph)
: mGraph(aGraph)
{
}
NS_IMETHOD Run()
{
if (mGraph) {
mGraph->RunInStableState();
}
return NS_OK;
}
private:
MediaStreamGraphImpl* mGraph;
};
/*
* Control messages forwarded from main thread to graph manager thread
*/
class CreateMessage : public ControlMessage {
public:
CreateMessage(MediaStream* aStream) : ControlMessage(aStream) {}
virtual void Run()
{
mStream->GraphImpl()->AddStream(mStream);
mStream->Init();
}
};
class MediaStreamGraphShutdownObserver MOZ_FINAL : public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
};
}
void
MediaStreamGraphImpl::RunInStableState()
{
NS_ASSERTION(NS_IsMainThread(), "Must be called on main thread");
nsTArray<nsCOMPtr<nsIRunnable> > runnables;
// When we're doing a forced shutdown, pending control messages may be
// run on the main thread via RunDuringShutdown. Those messages must
// run without the graph monitor being held. So, we collect them here.
nsTArray<nsAutoPtr<ControlMessage> > controlMessagesToRunDuringShutdown;
{
MonitorAutoLock lock(mMonitor);
mPostedRunInStableStateEvent = false;
runnables.SwapElements(mUpdateRunnables);
for (uint32_t i = 0; i < mStreamUpdates.Length(); ++i) {
StreamUpdate* update = &mStreamUpdates[i];
if (update->mStream) {
ApplyStreamUpdate(update);
}
}
mStreamUpdates.Clear();
if (mLifecycleState == LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP && mForceShutDown) {
// Defer calls to RunDuringShutdown() to happen while mMonitor is not held.
for (uint32_t i = 0; i < mMessageQueue.Length(); ++i) {
MessageBlock& mb = mMessageQueue[i];
controlMessagesToRunDuringShutdown.MoveElementsFrom(mb.mMessages);
}
mMessageQueue.Clear();
controlMessagesToRunDuringShutdown.MoveElementsFrom(mCurrentTaskMessageQueue);
// Stop MediaStreamGraph threads. Do not clear gGraph since
// we have outstanding DOM objects that may need it.
mLifecycleState = LIFECYCLE_WAITING_FOR_THREAD_SHUTDOWN;
nsCOMPtr<nsIRunnable> event = new MediaStreamGraphShutDownRunnable(this);
NS_DispatchToMainThread(event);
}
if (mLifecycleState == LIFECYCLE_THREAD_NOT_STARTED) {
mLifecycleState = LIFECYCLE_RUNNING;
// Start the thread now. We couldn't start it earlier because
// the graph might exit immediately on finding it has no streams. The
// first message for a new graph must create a stream.
nsCOMPtr<nsIRunnable> event = new MediaStreamGraphThreadRunnable(this);
NS_NewNamedThread("MediaStreamGrph", getter_AddRefs(mThread), event);
}
if (mCurrentTaskMessageQueue.IsEmpty()) {
if (mLifecycleState == LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP && IsEmpty()) {
// Complete shutdown. First, ensure that this graph is no longer used.
// A new graph graph will be created if one is needed.
LOG(PR_LOG_DEBUG, ("Disconnecting MediaStreamGraph %p", this));
if (this == gGraph) {
// null out gGraph if that's the graph being shut down
gGraph = nullptr;
}
// Asynchronously clean up old graph. We don't want to do this
// synchronously because it spins the event loop waiting for threads
// to shut down, and we don't want to do that in a stable state handler.
mLifecycleState = LIFECYCLE_WAITING_FOR_THREAD_SHUTDOWN;
nsCOMPtr<nsIRunnable> event = new MediaStreamGraphShutDownRunnable(this);
NS_DispatchToMainThread(event);
}
} else {
if (mLifecycleState <= LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP) {
MessageBlock* block = mMessageQueue.AppendElement();
block->mMessages.SwapElements(mCurrentTaskMessageQueue);
block->mGraphUpdateIndex = mGraphUpdatesSent;
++mGraphUpdatesSent;
EnsureNextIterationLocked(lock);
}
if (mLifecycleState == LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP) {
mLifecycleState = LIFECYCLE_RUNNING;
// Revive the MediaStreamGraph since we have more messages going to it.
// Note that we need to put messages into its queue before reviving it,
// or it might exit immediately.
nsCOMPtr<nsIRunnable> event = new MediaStreamGraphThreadRunnable(this);
mThread->Dispatch(event, 0);
}
}
mDetectedNotRunning = mLifecycleState > LIFECYCLE_RUNNING;
}
// Make sure we get a new current time in the next event loop task
mPostedRunInStableState = false;
for (uint32_t i = 0; i < runnables.Length(); ++i) {
runnables[i]->Run();
}
for (uint32_t i = 0; i < controlMessagesToRunDuringShutdown.Length(); ++i) {
controlMessagesToRunDuringShutdown[i]->RunDuringShutdown();
}
}
static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);
void
MediaStreamGraphImpl::EnsureRunInStableState()
{
NS_ASSERTION(NS_IsMainThread(), "main thread only");
if (mPostedRunInStableState)
return;
mPostedRunInStableState = true;
nsCOMPtr<nsIRunnable> event = new MediaStreamGraphStableStateRunnable(this);
nsCOMPtr<nsIAppShell> appShell = do_GetService(kAppShellCID);
if (appShell) {
appShell->RunInStableState(event);
} else {
NS_ERROR("Appshell already destroyed?");
}
}
void
MediaStreamGraphImpl::EnsureStableStateEventPosted()
{
mMonitor.AssertCurrentThreadOwns();
if (mPostedRunInStableStateEvent)
return;
mPostedRunInStableStateEvent = true;
nsCOMPtr<nsIRunnable> event = new MediaStreamGraphStableStateRunnable(this);
NS_DispatchToMainThread(event);
}
void
MediaStreamGraphImpl::AppendMessage(ControlMessage* aMessage)
{
NS_ASSERTION(NS_IsMainThread(), "main thread only");
NS_ASSERTION(!aMessage->GetStream() ||
!aMessage->GetStream()->IsDestroyed(),
"Stream already destroyed");
if (mDetectedNotRunning &&
mLifecycleState > LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP) {
// The graph control loop is not running and main thread cleanup has
// happened. From now on we can't append messages to mCurrentTaskMessageQueue,
// because that will never be processed again, so just RunDuringShutdown
// this message.
// This should only happen during forced shutdown.
aMessage->RunDuringShutdown();
delete aMessage;
if (IsEmpty()) {
if (gGraph == this) {
gGraph = nullptr;
delete this;
}
}
return;
}
mCurrentTaskMessageQueue.AppendElement(aMessage);
EnsureRunInStableState();
}
void
MediaStream::Init()
{
MediaStreamGraphImpl* graph = GraphImpl();
mBlocked.SetAtAndAfter(graph->mCurrentTime, true);
mExplicitBlockerCount.SetAtAndAfter(graph->mCurrentTime, true);
mExplicitBlockerCount.SetAtAndAfter(graph->mStateComputedTime, false);
}
MediaStreamGraphImpl*
MediaStream::GraphImpl()
{
return mGraph;
}
MediaStreamGraph*
MediaStream::Graph()
{
return mGraph;
}
void
MediaStream::SetGraphImpl(MediaStreamGraphImpl* aGraph)
{
MOZ_ASSERT(!mGraph, "Should only be called once");
mGraph = aGraph;
}
StreamTime
MediaStream::GraphTimeToStreamTime(GraphTime aTime)
{
return GraphImpl()->GraphTimeToStreamTime(this, aTime);
}
StreamTime
MediaStream::GraphTimeToStreamTimeOptimistic(GraphTime aTime)
{
return GraphImpl()->GraphTimeToStreamTimeOptimistic(this, aTime);
}
GraphTime
MediaStream::StreamTimeToGraphTime(StreamTime aTime)
{
return GraphImpl()->StreamTimeToGraphTime(this, aTime, 0);
}
void
MediaStream::FinishOnGraphThread()
{
GraphImpl()->FinishStream(this);
}
void
MediaStream::RemoveAllListenersImpl()
{
for (int32_t i = mListeners.Length() - 1; i >= 0; --i) {
nsRefPtr<MediaStreamListener> listener = mListeners[i].forget();
listener->NotifyRemoved(GraphImpl());
}
mListeners.Clear();
}
void
MediaStream::DestroyImpl()
{
RemoveAllListenersImpl();
for (int32_t i = mConsumers.Length() - 1; i >= 0; --i) {
mConsumers[i]->Disconnect();
}
for (uint32_t i = 0; i < mAudioOutputStreams.Length(); ++i) {
mAudioOutputStreams[i].mStream->Shutdown();
}
mAudioOutputStreams.Clear();
}
void
MediaStream::Destroy()
{
// Keep this stream alive until we leave this method
nsRefPtr<MediaStream> kungFuDeathGrip = this;
class Message : public ControlMessage {
public:
Message(MediaStream* aStream) : ControlMessage(aStream) {}
virtual void Run()
{
mStream->DestroyImpl();
mStream->GraphImpl()->RemoveStream(mStream);
}
virtual void RunDuringShutdown()
{ Run(); }
};
mWrapper = nullptr;
GraphImpl()->AppendMessage(new Message(this));
// Message::RunDuringShutdown may have removed this stream from the graph,
// but our kungFuDeathGrip above will have kept this stream alive if
// necessary.
mMainThreadDestroyed = true;
}
void
MediaStream::AddAudioOutput(void* aKey)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, void* aKey) : ControlMessage(aStream), mKey(aKey) {}
virtual void Run()
{
mStream->AddAudioOutputImpl(mKey);
}
void* mKey;
};
GraphImpl()->AppendMessage(new Message(this, aKey));
}
void
MediaStream::SetAudioOutputVolumeImpl(void* aKey, float aVolume)
{
for (uint32_t i = 0; i < mAudioOutputs.Length(); ++i) {
if (mAudioOutputs[i].mKey == aKey) {
mAudioOutputs[i].mVolume = aVolume;
return;
}
}
NS_ERROR("Audio output key not found");
}
void
MediaStream::SetAudioOutputVolume(void* aKey, float aVolume)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, void* aKey, float aVolume) :
ControlMessage(aStream), mKey(aKey), mVolume(aVolume) {}
virtual void Run()
{
mStream->SetAudioOutputVolumeImpl(mKey, mVolume);
}
void* mKey;
float mVolume;
};
GraphImpl()->AppendMessage(new Message(this, aKey, aVolume));
}
void
MediaStream::RemoveAudioOutputImpl(void* aKey)
{
for (uint32_t i = 0; i < mAudioOutputs.Length(); ++i) {
if (mAudioOutputs[i].mKey == aKey) {
mAudioOutputs.RemoveElementAt(i);
return;
}
}
NS_ERROR("Audio output key not found");
}
void
MediaStream::RemoveAudioOutput(void* aKey)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, void* aKey) :
ControlMessage(aStream), mKey(aKey) {}
virtual void Run()
{
mStream->RemoveAudioOutputImpl(mKey);
}
void* mKey;
};
GraphImpl()->AppendMessage(new Message(this, aKey));
}
void
MediaStream::AddVideoOutput(VideoFrameContainer* aContainer)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, VideoFrameContainer* aContainer) :
ControlMessage(aStream), mContainer(aContainer) {}
virtual void Run()
{
mStream->AddVideoOutputImpl(mContainer.forget());
}
nsRefPtr<VideoFrameContainer> mContainer;
};
GraphImpl()->AppendMessage(new Message(this, aContainer));
}
void
MediaStream::RemoveVideoOutput(VideoFrameContainer* aContainer)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, VideoFrameContainer* aContainer) :
ControlMessage(aStream), mContainer(aContainer) {}
virtual void Run()
{
mStream->RemoveVideoOutputImpl(mContainer);
}
nsRefPtr<VideoFrameContainer> mContainer;
};
GraphImpl()->AppendMessage(new Message(this, aContainer));
}
void
MediaStream::ChangeExplicitBlockerCount(int32_t aDelta)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, int32_t aDelta) :
ControlMessage(aStream), mDelta(aDelta) {}
virtual void Run()
{
mStream->ChangeExplicitBlockerCountImpl(
mStream->GraphImpl()->mStateComputedTime, mDelta);
}
int32_t mDelta;
};
GraphImpl()->AppendMessage(new Message(this, aDelta));
}
void
MediaStream::AddListenerImpl(already_AddRefed<MediaStreamListener> aListener)
{
MediaStreamListener* listener = *mListeners.AppendElement() = aListener;
listener->NotifyBlockingChanged(GraphImpl(),
mNotifiedBlocked ? MediaStreamListener::BLOCKED : MediaStreamListener::UNBLOCKED);
if (mNotifiedFinished) {
listener->NotifyFinished(GraphImpl());
}
if (mNotifiedHasCurrentData) {
listener->NotifyHasCurrentData(GraphImpl());
}
}
void
MediaStream::AddListener(MediaStreamListener* aListener)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, MediaStreamListener* aListener) :
ControlMessage(aStream), mListener(aListener) {}
virtual void Run()
{
mStream->AddListenerImpl(mListener.forget());
}
nsRefPtr<MediaStreamListener> mListener;
};
GraphImpl()->AppendMessage(new Message(this, aListener));
}
void
MediaStream::RemoveListenerImpl(MediaStreamListener* aListener)
{
// wouldn't need this if we could do it in the opposite order
nsRefPtr<MediaStreamListener> listener(aListener);
mListeners.RemoveElement(aListener);
listener->NotifyRemoved(GraphImpl());
}
void
MediaStream::RemoveListener(MediaStreamListener* aListener)
{
class Message : public ControlMessage {
public:
Message(MediaStream* aStream, MediaStreamListener* aListener) :
ControlMessage(aStream), mListener(aListener) {}
virtual void Run()
{
mStream->RemoveListenerImpl(mListener);
}
nsRefPtr<MediaStreamListener> mListener;
};
// If the stream is destroyed the Listeners have or will be
// removed.
if (!IsDestroyed()) {
GraphImpl()->AppendMessage(new Message(this, aListener));
}
}
void
SourceMediaStream::DestroyImpl()
{
{
MutexAutoLock lock(mMutex);
mDestroyed = true;
}
MediaStream::DestroyImpl();
}
void
SourceMediaStream::SetPullEnabled(bool aEnabled)
{
MutexAutoLock lock(mMutex);
mPullEnabled = aEnabled;
if (mPullEnabled && !mDestroyed) {
GraphImpl()->EnsureNextIteration();
}
}
void
SourceMediaStream::AddTrack(TrackID aID, TrackRate aRate, TrackTicks aStart,
MediaSegment* aSegment)
{
MutexAutoLock lock(mMutex);
TrackData* data = mUpdateTracks.AppendElement();
data->mID = aID;
data->mRate = aRate;
data->mStart = aStart;
data->mCommands = TRACK_CREATE;
data->mData = aSegment;
data->mHaveEnough = false;
if (!mDestroyed) {
GraphImpl()->EnsureNextIteration();
}
}
bool
SourceMediaStream::AppendToTrack(TrackID aID, MediaSegment* aSegment)
{
MutexAutoLock lock(mMutex);
// ::EndAllTrackAndFinished() can end these before the sources notice
bool appended = false;
if (!mFinished) {
TrackData *track = FindDataForTrack(aID);
if (track) {
track->mData->AppendFrom(aSegment);
appended = true;
} else {
aSegment->Clear();
}
}
if (!mDestroyed) {
GraphImpl()->EnsureNextIteration();
}
return appended;
}
bool
SourceMediaStream::HaveEnoughBuffered(TrackID aID)
{
MutexAutoLock lock(mMutex);
TrackData *track = FindDataForTrack(aID);
if (track) {
return track->mHaveEnough;
}
return false;
}
void
SourceMediaStream::DispatchWhenNotEnoughBuffered(TrackID aID,
nsIThread* aSignalThread, nsIRunnable* aSignalRunnable)
{
MutexAutoLock lock(mMutex);
TrackData* data = FindDataForTrack(aID);
if (!data) {
aSignalThread->Dispatch(aSignalRunnable, 0);
return;
}
if (data->mHaveEnough) {
data->mDispatchWhenNotEnough.AppendElement()->Init(aSignalThread, aSignalRunnable);
} else {
aSignalThread->Dispatch(aSignalRunnable, 0);
}
}
void
SourceMediaStream::EndTrack(TrackID aID)
{
MutexAutoLock lock(mMutex);
// ::EndAllTrackAndFinished() can end these before the sources call this
if (!mFinished) {
TrackData *track = FindDataForTrack(aID);
if (track) {
track->mCommands |= TRACK_END;
}
}
if (!mDestroyed) {
GraphImpl()->EnsureNextIteration();
}
}
void
SourceMediaStream::AdvanceKnownTracksTime(StreamTime aKnownTime)
{
MutexAutoLock lock(mMutex);
mUpdateKnownTracksTime = aKnownTime;
if (!mDestroyed) {
GraphImpl()->EnsureNextIteration();
}
}
void
SourceMediaStream::FinishWithLockHeld()
{
mMutex.AssertCurrentThreadOwns();
mUpdateFinished = true;
if (!mDestroyed) {
GraphImpl()->EnsureNextIteration();
}
}
void
SourceMediaStream::EndAllTrackAndFinish()
{
MutexAutoLock lock(mMutex);
for (uint32_t i = 0; i < mUpdateTracks.Length(); ++i) {
SourceMediaStream::TrackData* data = &mUpdateTracks[i];
data->mCommands |= TRACK_END;
}
FinishWithLockHeld();
// we will call NotifyFinished() to let GetUserMedia know
}
void
MediaInputPort::Init()
{
LOG(PR_LOG_DEBUG, ("Adding MediaInputPort %p (from %p to %p) to the graph",
this, mSource, mDest));
mSource->AddConsumer(this);
mDest->AddInput(this);
// mPortCount decremented via MediaInputPort::Destroy's message
++mDest->GraphImpl()->mPortCount;
}
void
MediaInputPort::Disconnect()
{
NS_ASSERTION(!mSource == !mDest,
"mSource must either both be null or both non-null");
if (!mSource)
return;
mSource->RemoveConsumer(this);
mSource = nullptr;
mDest->RemoveInput(this);
mDest = nullptr;
}
MediaInputPort::InputInterval
MediaInputPort::GetNextInputInterval(GraphTime aTime)
{
InputInterval result = { GRAPH_TIME_MAX, GRAPH_TIME_MAX, false };
GraphTime t = aTime;
GraphTime end;
for (;;) {
if (!mDest->mBlocked.GetAt(t, &end))
break;
if (end == GRAPH_TIME_MAX)
return result;
t = end;
}
result.mStart = t;
GraphTime sourceEnd;
result.mInputIsBlocked = mSource->mBlocked.GetAt(t, &sourceEnd);
result.mEnd = std::min(end, sourceEnd);
return result;
}
void
MediaInputPort::Destroy()
{
class Message : public ControlMessage {
public:
Message(MediaInputPort* aPort)
: ControlMessage(nullptr), mPort(aPort) {}
virtual void Run()
{
mPort->Disconnect();
--mPort->GraphImpl()->mPortCount;
NS_RELEASE(mPort);
}
virtual void RunDuringShutdown()
{
Run();
}
// This does not need to be strongly referenced; the graph is holding
// a strong reference to the port, which we will remove. This will be the
// last message for the port.
MediaInputPort* mPort;
};
GraphImpl()->AppendMessage(new Message(this));
}
MediaStreamGraphImpl*
MediaInputPort::GraphImpl()
{
return mGraph;
}
MediaStreamGraph*
MediaInputPort::Graph()
{
return mGraph;
}
void
MediaInputPort::SetGraphImpl(MediaStreamGraphImpl* aGraph)
{
MOZ_ASSERT(!mGraph, "Should only be called once");
mGraph = aGraph;
}
already_AddRefed<MediaInputPort>
ProcessedMediaStream::AllocateInputPort(MediaStream* aStream, uint32_t aFlags)
{
// This method creates two references to the MediaInputPort: one for
// the main thread, and one for the MediaStreamGraph.
class Message : public ControlMessage {
public:
Message(MediaInputPort* aPort)
: ControlMessage(aPort->GetDestination()),
mPort(aPort) {}
virtual void Run()
{
mPort->Init();
// The graph holds its reference implicitly
mPort.forget();
}
nsRefPtr<MediaInputPort> mPort;
};
nsRefPtr<MediaInputPort> port = new MediaInputPort(aStream, this, aFlags);
port->SetGraphImpl(GraphImpl());
GraphImpl()->AppendMessage(new Message(port));
return port.forget();
}
void
ProcessedMediaStream::Finish()
{
class Message : public ControlMessage {
public:
Message(ProcessedMediaStream* aStream)
: ControlMessage(aStream) {}
virtual void Run()
{
mStream->GraphImpl()->FinishStream(mStream);
}
};
GraphImpl()->AppendMessage(new Message(this));
}
void
ProcessedMediaStream::SetAutofinish(bool aAutofinish)
{
class Message : public ControlMessage {
public:
Message(ProcessedMediaStream* aStream, bool aAutofinish)
: ControlMessage(aStream), mAutofinish(aAutofinish) {}
virtual void Run()
{
static_cast<ProcessedMediaStream*>(mStream)->SetAutofinishImpl(mAutofinish);
}
bool mAutofinish;
};
GraphImpl()->AppendMessage(new Message(this, aAutofinish));
}
void
ProcessedMediaStream::DestroyImpl()
{
for (int32_t i = mInputs.Length() - 1; i >= 0; --i) {
mInputs[i]->Disconnect();
}
MediaStream::DestroyImpl();
}
/**
* We make the initial mCurrentTime nonzero so that zero times can have
* special meaning if necessary.
*/
static const int32_t INITIAL_CURRENT_TIME = 1;
MediaStreamGraphImpl::MediaStreamGraphImpl()
: mCurrentTime(INITIAL_CURRENT_TIME)
, mStateComputedTime(INITIAL_CURRENT_TIME)
, mProcessingGraphUpdateIndex(0)
, mPortCount(0)
, mMonitor("MediaStreamGraphImpl")
, mLifecycleState(LIFECYCLE_THREAD_NOT_STARTED)
, mWaitState(WAITSTATE_RUNNING)
, mNeedAnotherIteration(false)
, mForceShutDown(false)
, mPostedRunInStableStateEvent(false)
, mDetectedNotRunning(false)
, mPostedRunInStableState(false)
{
#ifdef PR_LOGGING
if (!gMediaStreamGraphLog) {
gMediaStreamGraphLog = PR_NewLogModule("MediaStreamGraph");
}
#endif
mCurrentTimeStamp = mInitialTimeStamp = TimeStamp::Now();
}
NS_IMPL_ISUPPORTS1(MediaStreamGraphShutdownObserver, nsIObserver)
static bool gShutdownObserverRegistered = false;
NS_IMETHODIMP
MediaStreamGraphShutdownObserver::Observe(nsISupports *aSubject,
const char *aTopic,
const PRUnichar *aData)
{
if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
if (gGraph) {
gGraph->ForceShutDown();
}
nsContentUtils::UnregisterShutdownObserver(this);
gShutdownObserverRegistered = false;
}
return NS_OK;
}
MediaStreamGraph*
MediaStreamGraph::GetInstance()
{
NS_ASSERTION(NS_IsMainThread(), "Main thread only");
if (!gGraph) {
if (!gShutdownObserverRegistered) {
gShutdownObserverRegistered = true;
nsContentUtils::RegisterShutdownObserver(new MediaStreamGraphShutdownObserver());
}
gGraph = new MediaStreamGraphImpl();
LOG(PR_LOG_DEBUG, ("Starting up MediaStreamGraph %p", gGraph));
}
return gGraph;
}
SourceMediaStream*
MediaStreamGraph::CreateSourceStream(DOMMediaStream* aWrapper)
{
SourceMediaStream* stream = new SourceMediaStream(aWrapper);
NS_ADDREF(stream);
MediaStreamGraphImpl* graph = static_cast<MediaStreamGraphImpl*>(this);
stream->SetGraphImpl(graph);
graph->AppendMessage(new CreateMessage(stream));
return stream;
}
ProcessedMediaStream*
MediaStreamGraph::CreateTrackUnionStream(DOMMediaStream* aWrapper)
{
TrackUnionStream* stream = new TrackUnionStream(aWrapper);
NS_ADDREF(stream);
MediaStreamGraphImpl* graph = static_cast<MediaStreamGraphImpl*>(this);
stream->SetGraphImpl(graph);
graph->AppendMessage(new CreateMessage(stream));
return stream;
}
AudioNodeStream*
MediaStreamGraph::CreateAudioNodeStream(AudioNodeEngine* aEngine,
AudioNodeStreamKind aKind,
uint32_t aNumberOfInputChannels)
{
AudioNodeStream* stream = new AudioNodeStream(aEngine, aKind, aNumberOfInputChannels);
NS_ADDREF(stream);
MediaStreamGraphImpl* graph = static_cast<MediaStreamGraphImpl*>(this);
stream->SetGraphImpl(graph);
graph->AppendMessage(new CreateMessage(stream));
return stream;
}
}
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