зеркало из https://github.com/mozilla/gecko-dev.git
Bug 779721. Part 1: Simplify MediaStreamGraph's invariants around when messages are processed. r=jesup
Rename mBlockingDecisionsMadeUntilTime to mStateComputedTime. The invariant is that all graph state is known up to mStateComputedTime but not beyond it (except for some stream contents that may be buffered beyond it). Get rid of mMessageAffectedTime and all the code around computing "affected times" and "action times". Instead, all messages take effect at mStateComputedTime. Get rid of the two-phase execution of messages. Everything can just happen in a single Run() method.
This commit is contained in:
Robert O'Callahan
Родитель
b79aff66a9
Коммит
e77b4d50d2
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@ -91,16 +91,14 @@ public:
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{
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MOZ_COUNT_DTOR(ControlMessage);
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}
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// Executed before we know what the action time for this message will be.
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// Call NoteStreamAffected on the stream whose output will be
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// modified by this message. Default implementation calls
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// NoteStreamAffected(mStream).
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virtual void UpdateAffectedStream();
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// Executed after we know what the action time for this message will be.
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virtual void Process() {}
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// Do the action of this message on the MediaStreamGraph thread. Any actions
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// affecting graph processing should take effect at mStateComputedTime.
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// All stream data for times < mStateComputedTime has already been
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// computed.
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virtual void Run() = 0;
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// When we're shutting down the application, most messages are ignored but
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// some cleanup messages should still be processed (on the main thread).
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virtual void ProcessDuringShutdown() {}
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virtual void RunDuringShutdown() {}
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protected:
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// We do not hold a reference to mStream. The main thread will be holding
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@ -201,11 +199,6 @@ public:
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* state to the new current time.
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*/
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void UpdateCurrentTime();
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/**
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* Update mLastActionTime to the time at which the current set of messages
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* will take effect.
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*/
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void ChooseActionTime();
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/**
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* Update the consumption state of aStream to reflect whether its data
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* is needed or not.
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@ -222,9 +215,9 @@ public:
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*/
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void UpdateBufferSufficiencyState(SourceMediaStream* aStream);
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/**
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* Compute the blocking states of streams from mBlockingDecisionsMadeUntilTime
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* Compute the blocking states of streams from mStateComputedTime
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* until the desired future time aEndBlockingDecisions.
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* Updates mBlockingDecisionsMadeUntilTime and sets MediaStream::mBlocked
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* Updates mStateComputedTime and sets MediaStream::mBlocked
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* for all streams.
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*/
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void RecomputeBlocking(GraphTime aEndBlockingDecisions);
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@ -267,7 +260,7 @@ public:
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/**
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* Given a stream time aTime, convert it to a graph time taking into
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* account the time during which aStream is scheduled to be blocked.
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* aTime must be <= mBlockingDecisionsMadeUntilTime since blocking decisions
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* aTime must be <= mStateComputedTime since blocking decisions
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* are only known up to that point.
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* If aTime is exactly at the start of a blocked interval, then the blocked
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* interval is included in the time returned if and only if
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@ -318,17 +311,6 @@ public:
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* Identify which graph update index we are currently processing.
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*/
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PRInt64 GetProcessingGraphUpdateIndex() { return mProcessingGraphUpdateIndex; }
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/**
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* Marks aStream as affected by a change in its output at desired time aTime
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* (in the timeline of aStream). The change may not actually happen at this time,
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* it may be delayed until later if there is buffered data we can't change.
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*/
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void NoteStreamAffected(MediaStream* aStream, double aTime);
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/**
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* Marks aStream as affected by a change in its output at the earliest
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* possible time.
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*/
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void NoteStreamAffected(MediaStream* aStream);
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/**
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* Add aStream to the graph and initializes its graph-specific state.
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*/
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@ -339,17 +321,6 @@ public:
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*/
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void RemoveStream(MediaStream* aStream);
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/**
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* Compute the earliest time at which an action be allowed to occur on any
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* stream. Actions cannot be earlier than the previous action time, and
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* cannot affect already-committed blocking decisions (and associated
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* buffered audio).
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*/
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GraphTime GetEarliestActionTime()
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{
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return NS_MAX(mCurrentTime, NS_MAX(mLastActionTime, mBlockingDecisionsMadeUntilTime));
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}
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// Data members
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/**
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@ -363,24 +334,17 @@ public:
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// is not running and this state can be used from the main thread.
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nsTArray<nsRefPtr<MediaStream> > mStreams;
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/**
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* The time the last action was deemed to have occurred. This could be
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* later than mCurrentTime if actions have to be delayed during data
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* buffering, or before mCurrentTime if mCurrentTime has advanced since
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* the last action happened. In ControlMessage::Process calls,
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* mLastActionTime has always been updated to be >= mCurrentTime.
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*/
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GraphTime mLastActionTime;
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/**
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* The current graph time for the current iteration of the RunThread control
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* loop.
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*/
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GraphTime mCurrentTime;
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/**
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* Blocking decisions have been made up to this time. We also buffer audio
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* up to this time.
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* Blocking decisions and all stream contents have been computed up to this
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* time. The next batch of updates from the main thread will be processed
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* at this time. Always >= mCurrentTime.
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*/
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GraphTime mBlockingDecisionsMadeUntilTime;
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GraphTime mStateComputedTime;
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/**
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* This is only used for logging.
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*/
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@ -560,36 +524,10 @@ MediaStreamGraphImpl::FinishStream(MediaStream* aStream)
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EnsureNextIteration();
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}
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void
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MediaStreamGraphImpl::NoteStreamAffected(MediaStream* aStream, double aTime)
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{
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NS_ASSERTION(aTime >= 0, "Bad time");
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GraphTime t =
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NS_MAX(GetEarliestActionTime(),
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StreamTimeToGraphTime(aStream, SecondsToMediaTime(aTime),
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INCLUDE_TRAILING_BLOCKED_INTERVAL));
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aStream->mMessageAffectedTime = NS_MIN(aStream->mMessageAffectedTime, t);
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}
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void
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MediaStreamGraphImpl::NoteStreamAffected(MediaStream* aStream)
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{
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GraphTime t = GetEarliestActionTime();
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aStream->mMessageAffectedTime = NS_MIN(aStream->mMessageAffectedTime, t);
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}
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void
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ControlMessage::UpdateAffectedStream()
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{
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NS_ASSERTION(mStream, "Must have stream for default UpdateAffectedStream");
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mStream->GraphImpl()->NoteStreamAffected(mStream);
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}
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void
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MediaStreamGraphImpl::AddStream(MediaStream* aStream)
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{
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aStream->mBufferStartTime = mCurrentTime;
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aStream->mMessageAffectedTime = GetEarliestActionTime();
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*mStreams.AppendElement() = already_AddRefed<MediaStream>(aStream);
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LOG(PR_LOG_DEBUG, ("Adding media stream %p to the graph", aStream));
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}
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@ -615,12 +553,6 @@ MediaStreamGraphImpl::RemoveStream(MediaStream* aStream)
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LOG(PR_LOG_DEBUG, ("Removing media stream %p from the graph", aStream));
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}
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void
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MediaStreamGraphImpl::ChooseActionTime()
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{
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mLastActionTime = GetEarliestActionTime();
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}
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void
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MediaStreamGraphImpl::UpdateConsumptionState(SourceMediaStream* aStream)
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{
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@ -653,8 +585,8 @@ MediaStreamGraphImpl::ExtractPendingInput(SourceMediaStream* aStream,
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// the stream at all between mBlockingDecisionsMadeUntilTime and
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// aDesiredUpToTime.
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StreamTime t =
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GraphTimeToStreamTime(aStream, mBlockingDecisionsMadeUntilTime) +
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(aDesiredUpToTime - mBlockingDecisionsMadeUntilTime);
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GraphTimeToStreamTime(aStream, mStateComputedTime) +
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(aDesiredUpToTime - mStateComputedTime);
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MutexAutoUnlock unlock(aStream->mMutex);
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l->NotifyPull(this, t);
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*aEnsureNextIteration = true;
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@ -744,7 +676,7 @@ StreamTime
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MediaStreamGraphImpl::GraphTimeToStreamTime(MediaStream* aStream,
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GraphTime aTime)
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{
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NS_ASSERTION(aTime <= mBlockingDecisionsMadeUntilTime,
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NS_ASSERTION(aTime <= mStateComputedTime,
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"Don't ask about times where we haven't made blocking decisions yet");
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if (aTime <= mCurrentTime) {
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return NS_MAX<StreamTime>(0, aTime - aStream->mBufferStartTime);
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@ -781,9 +713,9 @@ MediaStreamGraphImpl::StreamTimeToGraphTime(MediaStream* aStream,
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while (t < GRAPH_TIME_MAX) {
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bool blocked;
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GraphTime end;
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if (t < mBlockingDecisionsMadeUntilTime) {
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if (t < mStateComputedTime) {
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blocked = aStream->mBlocked.GetAt(t, &end);
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end = NS_MIN(end, mBlockingDecisionsMadeUntilTime);
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end = NS_MIN(end, mStateComputedTime);
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} else {
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blocked = false;
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end = GRAPH_TIME_MAX;
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@ -825,24 +757,24 @@ MediaStreamGraphImpl::UpdateCurrentTime()
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TimeStamp now = TimeStamp::Now();
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GraphTime nextCurrentTime =
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SecondsToMediaTime((now - mCurrentTimeStamp).ToSeconds()) + mCurrentTime;
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if (mBlockingDecisionsMadeUntilTime < nextCurrentTime) {
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if (mStateComputedTime < nextCurrentTime) {
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LOG(PR_LOG_WARNING, ("Media graph global underrun detected"));
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LOG(PR_LOG_DEBUG, ("Advancing mBlockingDecisionsMadeUntilTime from %f to %f",
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MediaTimeToSeconds(mBlockingDecisionsMadeUntilTime),
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LOG(PR_LOG_DEBUG, ("Advancing mStateComputedTime from %f to %f",
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MediaTimeToSeconds(mStateComputedTime),
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MediaTimeToSeconds(nextCurrentTime)));
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// Advance mBlockingDecisionsMadeUntilTime to nextCurrentTime by
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// adding blocked time to all streams starting at mBlockingDecisionsMadeUntilTime
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// Advance mStateComputedTime to nextCurrentTime by
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// adding blocked time to all streams starting at mStateComputedTime
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for (PRUint32 i = 0; i < mStreams.Length(); ++i) {
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mStreams[i]->mBlocked.SetAtAndAfter(mBlockingDecisionsMadeUntilTime, true);
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mStreams[i]->mBlocked.SetAtAndAfter(mStateComputedTime, true);
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}
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mBlockingDecisionsMadeUntilTime = nextCurrentTime;
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mStateComputedTime = nextCurrentTime;
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}
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mCurrentTimeStamp = now;
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LOG(PR_LOG_DEBUG, ("Updating current time to %f (real %f, mBlockingDecisionsMadeUntilTime %f)",
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LOG(PR_LOG_DEBUG, ("Updating current time to %f (real %f, mStateComputedTime %f)",
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MediaTimeToSeconds(nextCurrentTime),
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(now - mInitialTimeStamp).ToSeconds(),
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MediaTimeToSeconds(mBlockingDecisionsMadeUntilTime)));
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MediaTimeToSeconds(mStateComputedTime)));
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if (prevCurrentTime >= nextCurrentTime) {
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NS_ASSERTION(prevCurrentTime == nextCurrentTime, "Time can't go backwards!");
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@ -955,21 +887,20 @@ void
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MediaStreamGraphImpl::RecomputeBlocking(GraphTime aEndBlockingDecisions)
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{
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bool blockingDecisionsWillChange = false;
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// mBlockingDecisionsMadeUntilTime has been set in UpdateCurrentTime
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while (mBlockingDecisionsMadeUntilTime < aEndBlockingDecisions) {
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while (mStateComputedTime < aEndBlockingDecisions) {
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LOG(PR_LOG_DEBUG, ("Media graph %p computing blocking for time %f",
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this, MediaTimeToSeconds(mBlockingDecisionsMadeUntilTime)));
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this, MediaTimeToSeconds(mStateComputedTime)));
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GraphTime end = GRAPH_TIME_MAX;
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RecomputeBlockingAt(mBlockingDecisionsMadeUntilTime, aEndBlockingDecisions, &end);
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RecomputeBlockingAt(mStateComputedTime, aEndBlockingDecisions, &end);
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LOG(PR_LOG_DEBUG, ("Media graph %p computed blocking for interval %f to %f",
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this, MediaTimeToSeconds(mBlockingDecisionsMadeUntilTime),
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this, MediaTimeToSeconds(mStateComputedTime),
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MediaTimeToSeconds(end)));
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mBlockingDecisionsMadeUntilTime = end;
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mStateComputedTime = end;
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if (end < GRAPH_TIME_MAX) {
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blockingDecisionsWillChange = true;
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}
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}
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mBlockingDecisionsMadeUntilTime = aEndBlockingDecisions;
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mStateComputedTime = aEndBlockingDecisions;
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for (PRUint32 i = 0; i < mStreams.Length(); ++i) {
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MediaStream* stream = mStreams[i];
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@ -1087,7 +1018,7 @@ MediaStreamGraphImpl::CreateOrDestroyAudioStream(GraphTime aAudioOutputStartTime
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GraphTime startTime =
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StreamTimeToGraphTime(aStream, track->GetStartTimeRoundDown(),
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INCLUDE_TRAILING_BLOCKED_INTERVAL);
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if (startTime >= mBlockingDecisionsMadeUntilTime) {
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if (startTime >= mStateComputedTime) {
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// The stream wants to play audio, but nothing will play for the forseeable
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// future, so don't create the stream.
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return;
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@ -1286,17 +1217,8 @@ MediaStreamGraphImpl::RunThread()
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mProcessingGraphUpdateIndex = messageQueue[i].mGraphUpdateIndex;
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nsTArray<nsAutoPtr<ControlMessage> >& messages = messageQueue[i].mMessages;
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for (PRUint32 j = 0; j < mStreams.Length(); ++j) {
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mStreams[j]->mMessageAffectedTime = GRAPH_TIME_MAX;
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}
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for (PRUint32 j = 0; j < messages.Length(); ++j) {
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messages[j]->UpdateAffectedStream();
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}
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ChooseActionTime();
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for (PRUint32 j = 0; j < messages.Length(); ++j) {
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messages[j]->Process();
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messages[j]->Run();
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}
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}
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messageQueue.Clear();
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@ -1315,7 +1237,7 @@ MediaStreamGraphImpl::RunThread()
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}
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}
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GraphTime prevBlockingDecisionsMadeUntilTime = mBlockingDecisionsMadeUntilTime;
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GraphTime prevComputedTime = mStateComputedTime;
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RecomputeBlocking(endBlockingDecisions);
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PRUint32 audioStreamsActive = 0;
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@ -1324,9 +1246,8 @@ MediaStreamGraphImpl::RunThread()
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for (PRUint32 i = 0; i < mStreams.Length(); ++i) {
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MediaStream* stream = mStreams[i];
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UpdateFirstActiveTracks(stream);
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CreateOrDestroyAudioStream(prevBlockingDecisionsMadeUntilTime, stream);
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PlayAudio(stream, prevBlockingDecisionsMadeUntilTime,
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mBlockingDecisionsMadeUntilTime);
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CreateOrDestroyAudioStream(prevComputedTime, stream);
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PlayAudio(stream, prevComputedTime, mStateComputedTime);
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if (stream->mAudioOutput) {
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++audioStreamsActive;
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}
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@ -1489,12 +1410,9 @@ public:
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class CreateMessage : public ControlMessage {
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public:
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CreateMessage(MediaStream* aStream) : ControlMessage(aStream) {}
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virtual void UpdateAffectedStream()
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virtual void Run()
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{
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mStream->GraphImpl()->AddStream(mStream);
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}
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virtual void Process()
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{
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mStream->Init();
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}
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};
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@ -1532,12 +1450,12 @@ MediaStreamGraphImpl::RunInStableState()
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for (PRUint32 i = 0; i < mMessageQueue.Length(); ++i) {
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MessageBlock& mb = mMessageQueue[i];
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for (PRUint32 j = 0; j < mb.mMessages.Length(); ++j) {
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mb.mMessages[j]->ProcessDuringShutdown();
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mb.mMessages[j]->RunDuringShutdown();
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}
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}
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mMessageQueue.Clear();
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for (PRUint32 i = 0; i < mCurrentTaskMessageQueue.Length(); ++i) {
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mCurrentTaskMessageQueue[i]->ProcessDuringShutdown();
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mCurrentTaskMessageQueue[i]->RunDuringShutdown();
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}
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mCurrentTaskMessageQueue.Clear();
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// Stop MediaStreamGraph threads. Do not clear gGraph since
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@ -1640,10 +1558,10 @@ MediaStreamGraphImpl::AppendMessage(ControlMessage* aMessage)
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mLifecycleState > LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP) {
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// The graph control loop is not running and main thread cleanup has
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// happened. From now on we can't append messages to mCurrentTaskMessageQueue,
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// because that will never be processed again, so just ProcessDuringShutdown
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// because that will never be processed again, so just RunDuringShutdown
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// this message.
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// This should only happen during forced shutdown.
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aMessage->ProcessDuringShutdown();
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aMessage->RunDuringShutdown();
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delete aMessage;
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if (IsEmpty()) {
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NS_ASSERTION(gGraph == this, "Switched managers during forced shutdown?");
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@ -1663,7 +1581,7 @@ MediaStream::Init()
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MediaStreamGraphImpl* graph = GraphImpl();
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mBlocked.SetAtAndAfter(graph->mCurrentTime, true);
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mExplicitBlockerCount.SetAtAndAfter(graph->mCurrentTime, true);
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mExplicitBlockerCount.SetAtAndAfter(graph->mLastActionTime, false);
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mExplicitBlockerCount.SetAtAndAfter(graph->mStateComputedTime, false);
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}
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MediaStreamGraphImpl*
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@ -1687,13 +1605,13 @@ MediaStream::Destroy()
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class Message : public ControlMessage {
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public:
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Message(MediaStream* aStream) : ControlMessage(aStream) {}
|
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virtual void UpdateAffectedStream()
|
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virtual void Run()
|
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{
|
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mStream->DestroyImpl();
|
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mStream->GraphImpl()->RemoveStream(mStream);
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}
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virtual void ProcessDuringShutdown()
|
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{ UpdateAffectedStream(); }
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virtual void RunDuringShutdown()
|
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{ Run(); }
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};
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mWrapper = nullptr;
|
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GraphImpl()->AppendMessage(new Message(this));
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@ -1705,7 +1623,7 @@ MediaStream::AddAudioOutput(void* aKey)
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class Message : public ControlMessage {
|
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public:
|
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Message(MediaStream* aStream, void* aKey) : ControlMessage(aStream), mKey(aKey) {}
|
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virtual void UpdateAffectedStream()
|
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virtual void Run()
|
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{
|
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mStream->AddAudioOutputImpl(mKey);
|
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}
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@ -1733,7 +1651,7 @@ MediaStream::SetAudioOutputVolume(void* aKey, float aVolume)
|
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public:
|
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Message(MediaStream* aStream, void* aKey, float aVolume) :
|
||||
ControlMessage(aStream), mKey(aKey), mVolume(aVolume) {}
|
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virtual void UpdateAffectedStream()
|
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virtual void Run()
|
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{
|
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mStream->SetAudioOutputVolumeImpl(mKey, mVolume);
|
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}
|
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|
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@ -1762,7 +1680,7 @@ MediaStream::RemoveAudioOutput(void* aKey)
|
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public:
|
||||
Message(MediaStream* aStream, void* aKey) :
|
||||
ControlMessage(aStream), mKey(aKey) {}
|
||||
virtual void UpdateAffectedStream()
|
||||
virtual void Run()
|
||||
{
|
||||
mStream->RemoveAudioOutputImpl(mKey);
|
||||
}
|
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@ -1778,7 +1696,7 @@ MediaStream::AddVideoOutput(VideoFrameContainer* aContainer)
|
|||
public:
|
||||
Message(MediaStream* aStream, VideoFrameContainer* aContainer) :
|
||||
ControlMessage(aStream), mContainer(aContainer) {}
|
||||
virtual void UpdateAffectedStream()
|
||||
virtual void Run()
|
||||
{
|
||||
mStream->AddVideoOutputImpl(mContainer.forget());
|
||||
}
|
||||
|
|
@ -1794,7 +1712,7 @@ MediaStream::RemoveVideoOutput(VideoFrameContainer* aContainer)
|
|||
public:
|
||||
Message(MediaStream* aStream, VideoFrameContainer* aContainer) :
|
||||
ControlMessage(aStream), mContainer(aContainer) {}
|
||||
virtual void UpdateAffectedStream()
|
||||
virtual void Run()
|
||||
{
|
||||
mStream->RemoveVideoOutputImpl(mContainer);
|
||||
}
|
||||
|
|
@ -1810,10 +1728,10 @@ MediaStream::ChangeExplicitBlockerCount(PRInt32 aDelta)
|
|||
public:
|
||||
Message(MediaStream* aStream, PRInt32 aDelta) :
|
||||
ControlMessage(aStream), mDelta(aDelta) {}
|
||||
virtual void UpdateAffectedStream()
|
||||
virtual void Run()
|
||||
{
|
||||
mStream->ChangeExplicitBlockerCountImpl(
|
||||
mStream->GraphImpl()->mLastActionTime, mDelta);
|
||||
mStream->GraphImpl()->mStateComputedTime, mDelta);
|
||||
}
|
||||
PRInt32 mDelta;
|
||||
};
|
||||
|
|
@ -1838,7 +1756,7 @@ MediaStream::AddListener(MediaStreamListener* aListener)
|
|||
public:
|
||||
Message(MediaStream* aStream, MediaStreamListener* aListener) :
|
||||
ControlMessage(aStream), mListener(aListener) {}
|
||||
virtual void UpdateAffectedStream()
|
||||
virtual void Run()
|
||||
{
|
||||
mStream->AddListenerImpl(mListener.forget());
|
||||
}
|
||||
|
|
@ -1854,7 +1772,7 @@ MediaStream::RemoveListener(MediaStreamListener* aListener)
|
|||
public:
|
||||
Message(MediaStream* aStream, MediaStreamListener* aListener) :
|
||||
ControlMessage(aStream), mListener(aListener) {}
|
||||
virtual void UpdateAffectedStream()
|
||||
virtual void Run()
|
||||
{
|
||||
mStream->RemoveListenerImpl(mListener);
|
||||
}
|
||||
|
|
@ -1991,9 +1909,8 @@ static const PRUint32 kIdleThreadTimeoutMs = 2000;
|
|||
static const PRInt32 INITIAL_CURRENT_TIME = 1;
|
||||
|
||||
MediaStreamGraphImpl::MediaStreamGraphImpl()
|
||||
: mLastActionTime(INITIAL_CURRENT_TIME)
|
||||
, mCurrentTime(INITIAL_CURRENT_TIME)
|
||||
, mBlockingDecisionsMadeUntilTime(1)
|
||||
: mCurrentTime(INITIAL_CURRENT_TIME)
|
||||
, mStateComputedTime(INITIAL_CURRENT_TIME)
|
||||
, mProcessingGraphUpdateIndex(0)
|
||||
, mMonitor("MediaStreamGraphImpl")
|
||||
, mLifecycleState(LIFECYCLE_THREAD_NOT_STARTED)
|
||||
|
|
|
|||
|
|
@ -216,7 +216,6 @@ public:
|
|||
, mNotifiedFinished(false)
|
||||
, mAudioPlaybackStartTime(0)
|
||||
, mBlockedAudioTime(0)
|
||||
, mMessageAffectedTime(0)
|
||||
, mWrapper(aWrapper)
|
||||
, mMainThreadCurrentTime(0)
|
||||
, mMainThreadFinished(false)
|
||||
|
|
@ -344,7 +343,7 @@ protected:
|
|||
|
||||
// Precomputed blocking status (over GraphTime).
|
||||
// This is only valid between the graph's mCurrentTime and
|
||||
// mBlockingDecisionsMadeUntilTime. The stream is considered to have
|
||||
// mStateComputedTime. The stream is considered to have
|
||||
// not been blocked before mCurrentTime (its mBufferStartTime is increased
|
||||
// as necessary to account for that time instead) --- this avoids us having to
|
||||
// record the entire history of the stream's blocking-ness in mBlocked.
|
||||
|
|
@ -377,10 +376,6 @@ protected:
|
|||
// tracks start at the same time, the one with the lowest ID.
|
||||
TrackID mFirstActiveTracks[MediaSegment::TYPE_COUNT];
|
||||
|
||||
// Temporary data used by MediaStreamGraph on the graph thread
|
||||
// The earliest time for which we would like to change this stream's output.
|
||||
GraphTime mMessageAffectedTime;
|
||||
|
||||
// This state is only used on the main thread.
|
||||
nsDOMMediaStream* mWrapper;
|
||||
// Main-thread views of state
|
||||
|
|
|
|||
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