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gecko-dev/dom/media/MediaTrackGraph.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 "MediaTrackGraphImpl.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Unused.h"
#include "AudioSegment.h"
#include "VideoSegment.h"
#include "nsContentUtils.h"
#include "nsPrintfCString.h"
#include "nsServiceManagerUtils.h"
#include "prerror.h"
#include "mozilla/Logging.h"
#include "mozilla/Attributes.h"
#include "ForwardedInputTrack.h"
#include "ImageContainer.h"
#include "AudioCaptureTrack.h"
#include "AudioNodeTrack.h"
#include "AudioNodeExternalInputTrack.h"
#include "MediaTrackListener.h"
#include "mozilla/dom/BaseAudioContextBinding.h"
#include "mozilla/media/MediaUtils.h"
#include <algorithm>
#include "GeckoProfiler.h"
#include "VideoFrameContainer.h"
#include "mozilla/AbstractThread.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/Unused.h"
#include "mtransport/runnable_utils.h"
#include "VideoUtils.h"
#include "GraphRunner.h"
#include "Tracing.h"
#include "UnderrunHandler.h"
#include "webaudio/blink/DenormalDisabler.h"
#include "webaudio/blink/HRTFDatabaseLoader.h"
using namespace mozilla::layers;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::media;
namespace mozilla {
LazyLogModule gMediaTrackGraphLog("MediaTrackGraph");
#ifdef LOG
# undef LOG
#endif // LOG
#define LOG(type, msg) MOZ_LOG(gMediaTrackGraphLog, type, msg)
/**
* A hash table containing the graph instances, one per document.
*
* The key is a hash of nsPIDOMWindowInner, see `WindowToHash`.
*/
static nsDataHashtable<nsUint32HashKey, MediaTrackGraphImpl*> gGraphs;
MediaTrackGraphImpl::~MediaTrackGraphImpl() {
MOZ_ASSERT(mTracks.IsEmpty() && mSuspendedTracks.IsEmpty(),
"All tracks should have been destroyed by messages from the main "
"thread");
LOG(LogLevel::Debug, ("MediaTrackGraph %p destroyed", this));
LOG(LogLevel::Debug, ("MediaTrackGraphImpl::~MediaTrackGraphImpl"));
}
void MediaTrackGraphImpl::AddTrackGraphThread(MediaTrack* aTrack) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
aTrack->mStartTime = mProcessedTime;
if (aTrack->IsSuspended()) {
mSuspendedTracks.AppendElement(aTrack);
LOG(LogLevel::Debug,
("%p: Adding media track %p, in the suspended track array", this,
aTrack));
} else {
mTracks.AppendElement(aTrack);
LOG(LogLevel::Debug, ("%p: Adding media track %p, count %zu", this, aTrack,
mTracks.Length()));
}
SetTrackOrderDirty();
}
void MediaTrackGraphImpl::RemoveTrackGraphThread(MediaTrack* aTrack) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
// Remove references in mTrackUpdates before we allow aTrack to die.
// Pending updates are not needed (since the main thread has already given
// up the track) so we will just drop them.
{
MonitorAutoLock lock(mMonitor);
for (uint32_t i = 0; i < mTrackUpdates.Length(); ++i) {
if (mTrackUpdates[i].mTrack == aTrack) {
mTrackUpdates[i].mTrack = nullptr;
}
}
}
// Ensure that mFirstCycleBreaker is updated when necessary.
SetTrackOrderDirty();
UnregisterAllAudioOutputs(aTrack);
if (aTrack->IsSuspended()) {
mSuspendedTracks.RemoveElement(aTrack);
} else {
mTracks.RemoveElement(aTrack);
}
LOG(LogLevel::Debug, ("%p: Removed media track %p, count %zu", this, aTrack,
mTracks.Length()));
NS_RELEASE(aTrack); // probably destroying it
}
TrackTime MediaTrackGraphImpl::GraphTimeToTrackTimeWithBlocking(
const MediaTrack* aTrack, GraphTime aTime) const {
MOZ_ASSERT(
aTime <= mStateComputedTime,
"Don't ask about times where we haven't made blocking decisions yet");
return std::max<TrackTime>(
0, std::min(aTime, aTrack->mStartBlocking) - aTrack->mStartTime);
}
GraphTime MediaTrackGraphImpl::IterationEnd() const {
MOZ_ASSERT(OnGraphThread());
return mIterationEndTime;
}
void MediaTrackGraphImpl::UpdateCurrentTimeForTracks(
GraphTime aPrevCurrentTime) {
MOZ_ASSERT(OnGraphThread());
for (MediaTrack* track : AllTracks()) {
// Shouldn't have already notified of ended *and* have output!
MOZ_ASSERT_IF(track->mStartBlocking > aPrevCurrentTime,
!track->mNotifiedEnded);
// Calculate blocked time and fire Blocked/Unblocked events
GraphTime blockedTime = mStateComputedTime - track->mStartBlocking;
NS_ASSERTION(blockedTime >= 0, "Error in blocking time");
track->AdvanceTimeVaryingValuesToCurrentTime(mStateComputedTime,
blockedTime);
LOG(LogLevel::Verbose,
("%p: MediaTrack %p bufferStartTime=%f blockedTime=%f", this, track,
MediaTimeToSeconds(track->mStartTime),
MediaTimeToSeconds(blockedTime)));
track->mStartBlocking = mStateComputedTime;
TrackTime trackCurrentTime =
track->GraphTimeToTrackTime(mStateComputedTime);
if (track->mEnded) {
MOZ_ASSERT(track->GetEnd() <= trackCurrentTime);
if (!track->mNotifiedEnded) {
// Playout of this track ended and listeners have not been notified.
track->mNotifiedEnded = true;
SetTrackOrderDirty();
for (const auto& listener : track->mTrackListeners) {
listener->NotifyOutput(this, track->GetEnd());
listener->NotifyEnded(this);
}
}
} else {
for (const auto& listener : track->mTrackListeners) {
listener->NotifyOutput(this, trackCurrentTime);
}
}
}
}
template <typename C, typename Chunk>
void MediaTrackGraphImpl::ProcessChunkMetadataForInterval(MediaTrack* aTrack,
C& aSegment,
TrackTime aStart,
TrackTime aEnd) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
MOZ_ASSERT(aTrack);
TrackTime offset = 0;
for (typename C::ConstChunkIterator chunk(aSegment); !chunk.IsEnded();
chunk.Next()) {
if (offset >= aEnd) {
break;
}
offset += chunk->GetDuration();
if (chunk->IsNull() || offset < aStart) {
continue;
}
const PrincipalHandle& principalHandle = chunk->GetPrincipalHandle();
if (principalHandle != aSegment.GetLastPrincipalHandle()) {
aSegment.SetLastPrincipalHandle(principalHandle);
LOG(LogLevel::Debug,
("%p: MediaTrack %p, principalHandle "
"changed in %sChunk with duration %lld",
this, aTrack,
aSegment.GetType() == MediaSegment::AUDIO ? "Audio" : "Video",
(long long)chunk->GetDuration()));
for (const auto& listener : aTrack->mTrackListeners) {
listener->NotifyPrincipalHandleChanged(this, principalHandle);
}
}
}
}
void MediaTrackGraphImpl::ProcessChunkMetadata(GraphTime aPrevCurrentTime) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
for (MediaTrack* track : AllTracks()) {
TrackTime iterationStart = track->GraphTimeToTrackTime(aPrevCurrentTime);
TrackTime iterationEnd = track->GraphTimeToTrackTime(mProcessedTime);
if (!track->mSegment) {
continue;
}
if (track->mType == MediaSegment::AUDIO) {
ProcessChunkMetadataForInterval<AudioSegment, AudioChunk>(
track, *track->GetData<AudioSegment>(), iterationStart, iterationEnd);
} else if (track->mType == MediaSegment::VIDEO) {
ProcessChunkMetadataForInterval<VideoSegment, VideoChunk>(
track, *track->GetData<VideoSegment>(), iterationStart, iterationEnd);
} else {
MOZ_CRASH("Unknown track type");
}
}
}
GraphTime MediaTrackGraphImpl::WillUnderrun(MediaTrack* aTrack,
GraphTime aEndBlockingDecisions) {
// Ended tracks can't underrun. ProcessedMediaTracks also can't cause
// underrun currently, since we'll always be able to produce data for them
// unless they block on some other track.
if (aTrack->mEnded || aTrack->AsProcessedTrack()) {
return aEndBlockingDecisions;
}
// This track isn't ended or suspended. We don't need to call
// TrackTimeToGraphTime since an underrun is the only thing that can block
// it.
GraphTime bufferEnd = aTrack->GetEnd() + aTrack->mStartTime;
#ifdef DEBUG
if (bufferEnd < mProcessedTime) {
LOG(LogLevel::Error, ("%p: MediaTrack %p underrun, "
"bufferEnd %f < mProcessedTime %f (%" PRId64
" < %" PRId64 "), TrackTime %" PRId64,
this, aTrack, MediaTimeToSeconds(bufferEnd),
MediaTimeToSeconds(mProcessedTime), bufferEnd,
mProcessedTime, aTrack->GetEnd()));
NS_ASSERTION(bufferEnd >= mProcessedTime, "Buffer underran");
}
#endif
return std::min(bufferEnd, aEndBlockingDecisions);
}
namespace {
// Value of mCycleMarker for unvisited tracks in cycle detection.
const uint32_t NOT_VISITED = UINT32_MAX;
// Value of mCycleMarker for ordered tracks in muted cycles.
const uint32_t IN_MUTED_CYCLE = 1;
} // namespace
bool MediaTrackGraphImpl::AudioTrackPresent() {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
bool audioTrackPresent = false;
for (MediaTrack* track : mTracks) {
if (track->AsAudioNodeTrack()) {
audioTrackPresent = true;
break;
}
if (track->mType == MediaSegment::AUDIO && !track->mNotifiedEnded) {
audioTrackPresent = true;
break;
}
}
// XXX For some reason, there are race conditions when starting an audio input
// where we find no active audio tracks. In any case, if we have an active
// audio input we should not allow a switch back to a SystemClockDriver
if (!audioTrackPresent && mInputDeviceUsers.Count() != 0) {
NS_WARNING("No audio tracks, but full-duplex audio is enabled!!!!!");
audioTrackPresent = true;
}
return audioTrackPresent;
}
void MediaTrackGraphImpl::UpdateTrackOrder() {
MOZ_ASSERT(OnGraphThread());
bool audioTrackPresent = AudioTrackPresent();
uint32_t graphOutputChannelCount = AudioOutputChannelCount();
// Note that this looks for any audio tracks, input or output, and switches
// to a SystemClockDriver if there are none. However, if another is already
// pending, let that switch happen.
if (!audioTrackPresent && mRealtime &&
CurrentDriver()->AsAudioCallbackDriver()) {
MonitorAutoLock mon(mMonitor);
if (CurrentDriver()->AsAudioCallbackDriver()->IsStarted() && !Switching()) {
if (LifecycleStateRef() == LIFECYCLE_RUNNING) {
SwitchAtNextIteration(
new SystemClockDriver(this, CurrentDriver(), mSampleRate));
}
}
}
if (audioTrackPresent && mRealtime &&
!CurrentDriver()->AsAudioCallbackDriver() && !Switching() &&
graphOutputChannelCount > 0) {
MonitorAutoLock mon(mMonitor);
if (LifecycleStateRef() == LIFECYCLE_RUNNING) {
AudioCallbackDriver* driver = new AudioCallbackDriver(
this, CurrentDriver(), mSampleRate, graphOutputChannelCount,
AudioInputChannelCount(), mOutputDeviceID, mInputDeviceID,
AudioInputDevicePreference());
SwitchAtNextIteration(driver);
}
}
// Check if this graph should switch to a different number of output channels.
// Generally, a driver switch is explicitly made by an event (e.g., setting
// the AudioDestinationNode channelCount), but if an HTMLMediaElement is
// directly playing back via another HTMLMediaElement, the number of channels
// of the media determines how many channels to output, and it can change
// dynamically.
if (CurrentDriver()->AsAudioCallbackDriver() && !Switching()) {
if (graphOutputChannelCount !=
CurrentDriver()->AsAudioCallbackDriver()->OutputChannelCount()) {
AudioCallbackDriver* driver = new AudioCallbackDriver(
this, CurrentDriver(), mSampleRate, graphOutputChannelCount,
AudioInputChannelCount(), mOutputDeviceID, mInputDeviceID,
AudioInputDevicePreference());
SwitchAtNextIteration(driver);
}
}
if (!mTrackOrderDirty) {
return;
}
mTrackOrderDirty = false;
// The algorithm for finding cycles is based on Tim Leslie's iterative
// implementation [1][2] of Pearce's variant [3] of Tarjan's strongly
// connected components (SCC) algorithm. There are variations (a) to
// distinguish whether tracks in SCCs of size 1 are in a cycle and (b) to
// re-run the algorithm over SCCs with breaks at DelayNodes.
//
// [1] http://www.timl.id.au/?p=327
// [2]
// https://github.com/scipy/scipy/blob/e2c502fca/scipy/sparse/csgraph/_traversal.pyx#L582
// [3] http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.102.1707
//
// There are two stacks. One for the depth-first search (DFS),
mozilla::LinkedList<MediaTrack> dfsStack;
// and another for tracks popped from the DFS stack, but still being
// considered as part of SCCs involving tracks on the stack.
mozilla::LinkedList<MediaTrack> sccStack;
// An index into mTracks for the next track found with no unsatisfied
// upstream dependencies.
uint32_t orderedTrackCount = 0;
for (uint32_t i = 0; i < mTracks.Length(); ++i) {
MediaTrack* t = mTracks[i];
ProcessedMediaTrack* pt = t->AsProcessedTrack();
if (pt) {
// The dfsStack initially contains a list of all processed tracks in
// unchanged order.
dfsStack.insertBack(t);
pt->mCycleMarker = NOT_VISITED;
} else {
// SourceMediaTracks have no inputs and so can be ordered now.
mTracks[orderedTrackCount] = t;
++orderedTrackCount;
}
}
// mNextStackMarker corresponds to "index" in Tarjan's algorithm. It is a
// counter to label mCycleMarker on the next visited track in the DFS
// uniquely in the set of visited tracks that are still being considered.
//
// In this implementation, the counter descends so that the values are
// strictly greater than the values that mCycleMarker takes when the track
// has been ordered (0 or IN_MUTED_CYCLE).
//
// Each new track labelled, as the DFS searches upstream, receives a value
// less than those used for all other tracks being considered.
uint32_t nextStackMarker = NOT_VISITED - 1;
// Reset list of DelayNodes in cycles stored at the tail of mTracks.
mFirstCycleBreaker = mTracks.Length();
// Rearrange dfsStack order as required to DFS upstream and pop tracks
// in processing order to place in mTracks.
while (auto pt = static_cast<ProcessedMediaTrack*>(dfsStack.getFirst())) {
const auto& inputs = pt->mInputs;
MOZ_ASSERT(pt->AsProcessedTrack());
if (pt->mCycleMarker == NOT_VISITED) {
// Record the position on the visited stack, so that any searches
// finding this track again know how much of the stack is in the cycle.
pt->mCycleMarker = nextStackMarker;
--nextStackMarker;
// Not-visited input tracks should be processed first.
// SourceMediaTracks have already been ordered.
for (uint32_t i = inputs.Length(); i--;) {
if (inputs[i]->mSource->IsSuspended()) {
continue;
}
auto input = inputs[i]->mSource->AsProcessedTrack();
if (input && input->mCycleMarker == NOT_VISITED) {
// It can be that this track has an input which is from a suspended
// AudioContext.
if (input->isInList()) {
input->remove();
dfsStack.insertFront(input);
}
}
}
continue;
}
// Returning from DFS. Pop from dfsStack.
pt->remove();
// cycleStackMarker keeps track of the highest marker value on any
// upstream track, if any, found receiving input, directly or indirectly,
// from the visited stack (and so from |ps|, making a cycle). In a
// variation from Tarjan's SCC algorithm, this does not include |ps|
// unless it is part of the cycle.
uint32_t cycleStackMarker = 0;
for (uint32_t i = inputs.Length(); i--;) {
if (inputs[i]->mSource->IsSuspended()) {
continue;
}
auto input = inputs[i]->mSource->AsProcessedTrack();
if (input) {
cycleStackMarker = std::max(cycleStackMarker, input->mCycleMarker);
}
}
if (cycleStackMarker <= IN_MUTED_CYCLE) {
// All inputs have been ordered and their stack markers have been removed.
// This track is not part of a cycle. It can be processed next.
pt->mCycleMarker = 0;
mTracks[orderedTrackCount] = pt;
++orderedTrackCount;
continue;
}
// A cycle has been found. Record this track for ordering when all
// tracks in this SCC have been popped from the DFS stack.
sccStack.insertFront(pt);
if (cycleStackMarker > pt->mCycleMarker) {
// Cycles have been found that involve tracks that remain on the stack.
// Leave mCycleMarker indicating the most downstream (last) track on
// the stack known to be part of this SCC. In this way, any searches on
// other paths that find |ps| will know (without having to traverse from
// this track again) that they are part of this SCC (i.e. part of an
// intersecting cycle).
pt->mCycleMarker = cycleStackMarker;
continue;
}
// |pit| is the root of an SCC involving no other tracks on dfsStack, the
// complete SCC has been recorded, and tracks in this SCC are part of at
// least one cycle.
MOZ_ASSERT(cycleStackMarker == pt->mCycleMarker);
// If there are DelayNodes in this SCC, then they may break the cycles.
bool haveDelayNode = false;
auto next = sccStack.getFirst();
// Tracks in this SCC are identified by mCycleMarker <= cycleStackMarker.
// (There may be other tracks later in sccStack from other incompletely
// searched SCCs, involving tracks still on dfsStack.)
//
// DelayNodes in cycles must behave differently from those not in cycles,
// so all DelayNodes in the SCC must be identified.
while (next && static_cast<ProcessedMediaTrack*>(next)->mCycleMarker <=
cycleStackMarker) {
auto nt = next->AsAudioNodeTrack();
// Get next before perhaps removing from list below.
next = next->getNext();
if (nt && nt->Engine()->AsDelayNodeEngine()) {
haveDelayNode = true;
// DelayNodes break cycles by producing their output in a
// preprocessing phase; they do not need to be ordered before their
// consumers. Order them at the tail of mTracks so that they can be
// handled specially. Do so now, so that DFS ignores them.
nt->remove();
nt->mCycleMarker = 0;
--mFirstCycleBreaker;
mTracks[mFirstCycleBreaker] = nt;
}
}
auto after_scc = next;
while ((next = sccStack.getFirst()) != after_scc) {
next->remove();
auto removed = static_cast<ProcessedMediaTrack*>(next);
if (haveDelayNode) {
// Return tracks to the DFS stack again (to order and detect cycles
// without delayNodes). Any of these tracks that are still inputs
// for tracks on the visited stack must be returned to the front of
// the stack to be ordered before their dependents. We know that none
// of these tracks need input from tracks on the visited stack, so
// they can all be searched and ordered before the current stack head
// is popped.
removed->mCycleMarker = NOT_VISITED;
dfsStack.insertFront(removed);
} else {
// Tracks in cycles without any DelayNodes must be muted, and so do
// not need input and can be ordered now. They must be ordered before
// their consumers so that their muted output is available.
removed->mCycleMarker = IN_MUTED_CYCLE;
mTracks[orderedTrackCount] = removed;
++orderedTrackCount;
}
}
}
MOZ_ASSERT(orderedTrackCount == mFirstCycleBreaker);
}
TrackTime MediaTrackGraphImpl::PlayAudio(AudioMixer* aMixer,
const TrackKeyAndVolume& aTkv,
GraphTime aPlayedTime) {
MOZ_ASSERT(OnGraphThread());
MOZ_ASSERT(mRealtime, "Should only attempt to play audio in realtime mode");
MOZ_ASSERT(aMixer, "Can only play audio if there's a mixer");
TrackTime ticksWritten = 0;
ticksWritten = 0;
MediaTrack* track = aTkv.mTrack;
AudioSegment* audio = track->GetData<AudioSegment>();
AudioSegment output;
TrackTime offset = track->GraphTimeToTrackTime(aPlayedTime);
// We don't update Track->mTracksStartTime here to account for time spent
// blocked. Instead, we'll update it in UpdateCurrentTimeForTracks after
// the blocked period has completed. But we do need to make sure we play
// from the right offsets in the track buffer, even if we've already
// written silence for some amount of blocked time after the current time.
GraphTime t = aPlayedTime;
while (t < mStateComputedTime) {
bool blocked = t >= track->mStartBlocking;
GraphTime end = blocked ? mStateComputedTime : track->mStartBlocking;
NS_ASSERTION(end <= mStateComputedTime, "mStartBlocking is wrong!");
// Check how many ticks of sound we can provide if we are blocked some
// time in the middle of this cycle.
TrackTime toWrite = end - t;
if (blocked) {
output.InsertNullDataAtStart(toWrite);
ticksWritten += toWrite;
LOG(LogLevel::Verbose,
("%p: MediaTrack %p writing %" PRId64 " blocking-silence samples for "
"%f to %f (%" PRId64 " to %" PRId64 ")",
this, track, toWrite, MediaTimeToSeconds(t), MediaTimeToSeconds(end),
offset, offset + toWrite));
} else {
TrackTime endTicksNeeded = offset + toWrite;
TrackTime endTicksAvailable = audio->GetDuration();
if (endTicksNeeded <= endTicksAvailable) {
LOG(LogLevel::Verbose,
("%p: MediaTrack %p writing %" PRId64 " samples for %f to %f "
"(samples %" PRId64 " to %" PRId64 ")",
this, track, toWrite, MediaTimeToSeconds(t),
MediaTimeToSeconds(end), offset, endTicksNeeded));
output.AppendSlice(*audio, offset, endTicksNeeded);
ticksWritten += toWrite;
offset = endTicksNeeded;
} else {
// MOZ_ASSERT(track->IsEnded(), "Not enough data, and track not
// ended."); If we are at the end of the track, maybe write the
// remaining samples, and pad with/output silence.
if (endTicksNeeded > endTicksAvailable && offset < endTicksAvailable) {
output.AppendSlice(*audio, offset, endTicksAvailable);
LOG(LogLevel::Verbose,
("%p: MediaTrack %p writing %" PRId64 " samples for %f to %f "
"(samples %" PRId64 " to %" PRId64 ")",
this, track, toWrite, MediaTimeToSeconds(t),
MediaTimeToSeconds(end), offset, endTicksNeeded));
uint32_t available = endTicksAvailable - offset;
ticksWritten += available;
toWrite -= available;
offset = endTicksAvailable;
}
output.AppendNullData(toWrite);
LOG(LogLevel::Verbose,
("%p MediaTrack %p writing %" PRId64 " padding slsamples for %f to "
"%f (samples %" PRId64 " to %" PRId64 ")",
this, track, toWrite, MediaTimeToSeconds(t),
MediaTimeToSeconds(end), offset, endTicksNeeded));
ticksWritten += toWrite;
}
output.ApplyVolume(mGlobalVolume * aTkv.mVolume);
}
t = end;
uint32_t outputChannels;
// Use the number of channel the driver expects: this is the number of
// channel that can be output by the underlying system level audio stream.
// Fall back to something sensible if this graph is being driven by a normal
// thread (this can happen when there are no output devices, etc.).
if (CurrentDriver()->AsAudioCallbackDriver()) {
outputChannels =
CurrentDriver()->AsAudioCallbackDriver()->OutputChannelCount();
} else {
outputChannels = AudioOutputChannelCount();
}
output.WriteTo(*aMixer, outputChannels, mSampleRate);
}
return ticksWritten;
}
void MediaTrackGraphImpl::OpenAudioInputImpl(CubebUtils::AudioDeviceID aID,
AudioDataListener* aListener) {
MOZ_ASSERT(OnGraphThread());
// Only allow one device per MTG (hence, per document), but allow opening a
// device multiple times
nsTArray<RefPtr<AudioDataListener>>& listeners =
mInputDeviceUsers.GetOrInsert(aID);
if (listeners.IsEmpty() && mInputDeviceUsers.Count() > 1) {
// We don't support opening multiple input device in a graph for now.
listeners.RemoveElement(aID);
return;
}
MOZ_ASSERT(!listeners.Contains(aListener), "Don't add a listener twice.");
listeners.AppendElement(aListener);
if (listeners.Length() == 1) { // first open for this device
mInputDeviceID = aID;
// Switch Drivers since we're adding input (to input-only or full-duplex)
MonitorAutoLock mon(mMonitor);
if (LifecycleStateRef() == LIFECYCLE_RUNNING) {
AudioCallbackDriver* driver = new AudioCallbackDriver(
this, CurrentDriver(), mSampleRate, AudioOutputChannelCount(),
AudioInputChannelCount(), mOutputDeviceID, mInputDeviceID,
AudioInputDevicePreference());
LOG(LogLevel::Debug,
("%p OpenAudioInput: starting new AudioCallbackDriver(input) %p",
this, driver));
SwitchAtNextIteration(driver);
} else {
LOG(LogLevel::Error, ("OpenAudioInput in shutdown!"));
MOZ_ASSERT_UNREACHABLE("Can't open cubeb inputs in shutdown");
}
}
}
nsresult MediaTrackGraphImpl::OpenAudioInput(CubebUtils::AudioDeviceID aID,
AudioDataListener* aListener) {
MOZ_ASSERT(NS_IsMainThread());
class Message : public ControlMessage {
public:
Message(MediaTrackGraphImpl* aGraph, CubebUtils::AudioDeviceID aID,
AudioDataListener* aListener)
: ControlMessage(nullptr),
mGraph(aGraph),
mID(aID),
mListener(aListener) {}
void Run() override { mGraph->OpenAudioInputImpl(mID, mListener); }
MediaTrackGraphImpl* mGraph;
CubebUtils::AudioDeviceID mID;
RefPtr<AudioDataListener> mListener;
};
// XXX Check not destroyed!
this->AppendMessage(MakeUnique<Message>(this, aID, aListener));
return NS_OK;
}
void MediaTrackGraphImpl::CloseAudioInputImpl(
Maybe<CubebUtils::AudioDeviceID>& aID, AudioDataListener* aListener) {
MOZ_ASSERT(OnGraphThread());
// It is possible to not know the ID here, find it first.
if (aID.isNothing()) {
for (auto iter = mInputDeviceUsers.Iter(); !iter.Done(); iter.Next()) {
if (iter.Data().Contains(aListener)) {
aID = Some(iter.Key());
}
}
MOZ_ASSERT(aID.isSome(), "Closing an audio input that was not opened.");
}
nsTArray<RefPtr<AudioDataListener>>* listeners =
mInputDeviceUsers.GetValue(aID.value());
MOZ_ASSERT(listeners);
DebugOnly<bool> wasPresent = listeners->RemoveElement(aListener);
MOZ_ASSERT(wasPresent);
// Breaks the cycle between the MTG and the listener.
aListener->Disconnect(this);
if (!listeners->IsEmpty()) {
// There is still a consumer for this audio input device
return;
}
mInputDeviceID = nullptr; // reset to default
mInputDeviceUsers.Remove(aID.value());
// Switch Drivers since we're adding or removing an input (to nothing/system
// or output only)
bool audioTrackPresent = AudioTrackPresent();
MonitorAutoLock mon(mMonitor);
if (LifecycleStateRef() == LIFECYCLE_RUNNING) {
GraphDriver* driver;
if (audioTrackPresent) {
// We still have audio output
LOG(LogLevel::Debug,
("%p: CloseInput: output present (AudioCallback)", this));
driver = new AudioCallbackDriver(
this, CurrentDriver(), mSampleRate, AudioOutputChannelCount(),
AudioInputChannelCount(), mOutputDeviceID, mInputDeviceID,
AudioInputDevicePreference());
SwitchAtNextIteration(driver);
} else if (CurrentDriver()->AsAudioCallbackDriver()) {
LOG(LogLevel::Debug,
("%p: CloseInput: no output present (SystemClockCallback)", this));
driver = new SystemClockDriver(this, CurrentDriver(), mSampleRate);
SwitchAtNextIteration(driver);
} // else SystemClockDriver->SystemClockDriver, no switch
}
}
void MediaTrackGraphImpl::RegisterAudioOutput(MediaTrack* aTrack, void* aKey) {
MOZ_ASSERT(OnGraphThread());
TrackKeyAndVolume* tkv = mAudioOutputs.AppendElement();
tkv->mTrack = aTrack;
tkv->mKey = aKey;
tkv->mVolume = 1.0;
if (!CurrentDriver()->AsAudioCallbackDriver() && !Switching()) {
MonitorAutoLock mon(mMonitor);
if (LifecycleStateRef() == LIFECYCLE_RUNNING) {
AudioCallbackDriver* driver = new AudioCallbackDriver(
this, CurrentDriver(), mSampleRate, AudioOutputChannelCount(),
AudioInputChannelCount(), mOutputDeviceID, mInputDeviceID,
AudioInputDevicePreference());
SwitchAtNextIteration(driver);
}
}
}
void MediaTrackGraphImpl::UnregisterAllAudioOutputs(MediaTrack* aTrack) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
for (int32_t i = mAudioOutputs.Length() - 1; i >= 0; i--) {
if (mAudioOutputs[i].mTrack == aTrack) {
mAudioOutputs.RemoveElementAt(i);
}
}
}
void MediaTrackGraphImpl::UnregisterAudioOutput(MediaTrack* aTrack,
void* aKey) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
mAudioOutputs.RemoveElementsBy(
[&aKey, &aTrack](const TrackKeyAndVolume& aTkv) {
return aTkv.mKey == aKey && aTkv.mTrack == aTrack;
});
}
void MediaTrackGraphImpl::CloseAudioInput(Maybe<CubebUtils::AudioDeviceID>& aID,
AudioDataListener* aListener) {
MOZ_ASSERT(NS_IsMainThread());
class Message : public ControlMessage {
public:
Message(MediaTrackGraphImpl* aGraph, Maybe<CubebUtils::AudioDeviceID>& aID,
AudioDataListener* aListener)
: ControlMessage(nullptr),
mGraph(aGraph),
mID(aID),
mListener(aListener) {}
void Run() override { mGraph->CloseAudioInputImpl(mID, mListener); }
MediaTrackGraphImpl* mGraph;
Maybe<CubebUtils::AudioDeviceID> mID;
RefPtr<AudioDataListener> mListener;
};
this->AppendMessage(MakeUnique<Message>(this, aID, aListener));
}
// All AudioInput listeners get the same speaker data (at least for now).
void MediaTrackGraphImpl::NotifyOutputData(AudioDataValue* aBuffer,
size_t aFrames, TrackRate aRate,
uint32_t aChannels) {
#ifdef ANDROID
// On Android, mInputDeviceID is always null and represents the default
// device.
// The absence of an input consumer is enough to know we need to bail out
// here.
if (!mInputDeviceUsers.GetValue(mInputDeviceID)) {
return;
}
#else
if (!mInputDeviceID) {
return;
}
#endif
// When/if we decide to support multiple input devices per graph, this needs
// to loop over them.
nsTArray<RefPtr<AudioDataListener>>* listeners =
mInputDeviceUsers.GetValue(mInputDeviceID);
MOZ_ASSERT(listeners);
for (auto& listener : *listeners) {
listener->NotifyOutputData(this, aBuffer, aFrames, aRate, aChannels);
}
}
void MediaTrackGraphImpl::NotifyStarted() {
#ifdef ANDROID
if (!mInputDeviceUsers.GetValue(mInputDeviceID)) {
return;
}
#else
if (!mInputDeviceID) {
return;
}
#endif
nsTArray<RefPtr<AudioDataListener>>* listeners =
mInputDeviceUsers.GetValue(mInputDeviceID);
MOZ_ASSERT(listeners);
for (auto& listener : *listeners) {
listener->NotifyStarted(this);
}
}
void MediaTrackGraphImpl::NotifyInputData(const AudioDataValue* aBuffer,
size_t aFrames, TrackRate aRate,
uint32_t aChannels) {
#ifdef ANDROID
if (!mInputDeviceUsers.GetValue(mInputDeviceID)) {
return;
}
#else
// Either we have an audio input device, or we just removed the audio input
// this iteration, and we're switching back to an output-only driver next
// iteration.
MOZ_ASSERT(mInputDeviceID || Switching());
if (!mInputDeviceID) {
return;
}
#endif
nsTArray<RefPtr<AudioDataListener>>* listeners =
mInputDeviceUsers.GetValue(mInputDeviceID);
MOZ_ASSERT(listeners);
for (auto& listener : *listeners) {
listener->NotifyInputData(this, aBuffer, aFrames, aRate, aChannels);
}
}
void MediaTrackGraphImpl::DeviceChangedImpl() {
MOZ_ASSERT(OnGraphThread());
#ifdef ANDROID
if (!mInputDeviceUsers.GetValue(mInputDeviceID)) {
return;
}
#else
if (!mInputDeviceID) {
return;
}
#endif
nsTArray<RefPtr<AudioDataListener>>* listeners =
mInputDeviceUsers.GetValue(mInputDeviceID);
for (auto& listener : *listeners) {
listener->DeviceChanged(this);
}
}
void MediaTrackGraphImpl::DeviceChanged() {
// This is safe to be called from any thread: this message comes from an
// underlying platform API, and we don't have much guarantees. If it is not
// called from the main thread (and it probably will rarely be), it will post
// itself to the main thread, and the actual device change message will be ran
// and acted upon on the graph thread.
if (!NS_IsMainThread()) {
RefPtr<nsIRunnable> runnable = WrapRunnable(
RefPtr<MediaTrackGraphImpl>(this), &MediaTrackGraphImpl::DeviceChanged);
mAbstractMainThread->Dispatch(runnable.forget());
return;
}
class Message : public ControlMessage {
public:
explicit Message(MediaTrackGraph* aGraph)
: ControlMessage(nullptr),
mGraphImpl(static_cast<MediaTrackGraphImpl*>(aGraph)) {}
void Run() override { mGraphImpl->DeviceChangedImpl(); }
// We know that this is valid, because the graph can't shutdown if it has
// messages.
MediaTrackGraphImpl* mGraphImpl;
};
if (mMainThreadTrackCount == 0 && mMainThreadPortCount == 0) {
// This is a special case where the origin of this event cannot control the
// lifetime of the graph, because the graph is controling the lifetime of
// the AudioCallbackDriver where the event originated.
// We know the graph is soon going away, so there's no need to notify about
// this device change.
return;
}
// Reset the latency, it will get fetched again next time it's queried.
MOZ_ASSERT(NS_IsMainThread());
mAudioOutputLatency = 0.0;
AppendMessage(MakeUnique<Message>(this));
}
void MediaTrackGraphImpl::ReevaluateInputDevice() {
MOZ_ASSERT(OnGraphThread());
bool needToSwitch = false;
if (CurrentDriver()->AsAudioCallbackDriver()) {
AudioCallbackDriver* audioCallbackDriver =
CurrentDriver()->AsAudioCallbackDriver();
if (audioCallbackDriver->InputChannelCount() != AudioInputChannelCount()) {
needToSwitch = true;
}
if (audioCallbackDriver->InputDevicePreference() !=
AudioInputDevicePreference()) {
needToSwitch = true;
}
} else {
// We're already in the process of switching to a audio callback driver,
// which will happen at the next iteration.
// However, maybe it's not the correct number of channels. Re-query the
// correct channel amount at this time.
MOZ_ASSERT(Switching());
needToSwitch = true;
}
if (needToSwitch) {
AudioCallbackDriver* newDriver = new AudioCallbackDriver(
this, CurrentDriver(), mSampleRate, AudioOutputChannelCount(),
AudioInputChannelCount(), mOutputDeviceID, mInputDeviceID,
AudioInputDevicePreference());
SwitchAtNextIteration(newDriver);
}
}
bool MediaTrackGraphImpl::OnGraphThreadOrNotRunning() const {
// either we're on the right thread (and calling CurrentDriver() is safe),
// or we're going to fail the assert anyway, so don't cross-check
// via CurrentDriver().
return mGraphDriverRunning ? OnGraphThread() : NS_IsMainThread();
}
bool MediaTrackGraphImpl::OnGraphThread() const {
// we're on the right thread (and calling mDriver is safe),
MOZ_ASSERT(mDriver);
if (mGraphRunner && mGraphRunner->OnThread()) {
return true;
}
return mDriver->OnThread();
}
bool MediaTrackGraphImpl::Destroyed() const {
MOZ_ASSERT(NS_IsMainThread());
return !mSelfRef;
}
bool MediaTrackGraphImpl::ShouldUpdateMainThread() {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
if (mRealtime) {
return true;
}
TimeStamp now = TimeStamp::Now();
// For offline graphs, update now if it has been long enough since the last
// update, or if it has reached the end.
if ((now - mLastMainThreadUpdate).ToMilliseconds() >
CurrentDriver()->IterationDuration() ||
mStateComputedTime >= mEndTime) {
mLastMainThreadUpdate = now;
return true;
}
return false;
}
void MediaTrackGraphImpl::PrepareUpdatesToMainThreadState(bool aFinalUpdate) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
mMonitor.AssertCurrentThreadOwns();
// We don't want to frequently update the main thread about timing update
// when we are not running in realtime.
if (aFinalUpdate || ShouldUpdateMainThread()) {
// Strip updates that will be obsoleted below, so as to keep the length of
// mTrackUpdates sane.
size_t keptUpdateCount = 0;
for (size_t i = 0; i < mTrackUpdates.Length(); ++i) {
MediaTrack* track = mTrackUpdates[i].mTrack;
// RemoveTrackGraphThread() clears mTrack in updates for
// tracks that are removed from the graph.
MOZ_ASSERT(!track || track->GraphImpl() == this);
if (!track || track->MainThreadNeedsUpdates()) {
// Discard this update as it has either been cleared when the track
// was destroyed or there will be a newer update below.
continue;
}
if (keptUpdateCount != i) {
mTrackUpdates[keptUpdateCount] = std::move(mTrackUpdates[i]);
MOZ_ASSERT(!mTrackUpdates[i].mTrack);
}
++keptUpdateCount;
}
mTrackUpdates.TruncateLength(keptUpdateCount);
mTrackUpdates.SetCapacity(mTrackUpdates.Length() + mTracks.Length() +
mSuspendedTracks.Length());
for (MediaTrack* track : AllTracks()) {
if (!track->MainThreadNeedsUpdates()) {
continue;
}
TrackUpdate* update = mTrackUpdates.AppendElement();
update->mTrack = track;
// No blocking to worry about here, since we've passed
// UpdateCurrentTimeForTracks.
update->mNextMainThreadCurrentTime =
track->GraphTimeToTrackTime(mProcessedTime);
update->mNextMainThreadEnded = track->mNotifiedEnded;
}
mNextMainThreadGraphTime = mProcessedTime;
if (!mPendingUpdateRunnables.IsEmpty()) {
mUpdateRunnables.AppendElements(std::move(mPendingUpdateRunnables));
}
}
// If this is the final update, then a stable state event will soon be
// posted just before this thread finishes, and so there is no need to also
// post here.
if (!aFinalUpdate &&
// Don't send the message to the main thread if it's not going to have
// any work to do.
!(mUpdateRunnables.IsEmpty() && mTrackUpdates.IsEmpty())) {
EnsureStableStateEventPosted();
}
}
GraphTime MediaTrackGraphImpl::RoundUpToEndOfAudioBlock(GraphTime aTime) {
if (aTime % WEBAUDIO_BLOCK_SIZE == 0) {
return aTime;
}
return RoundUpToNextAudioBlock(aTime);
}
GraphTime MediaTrackGraphImpl::RoundUpToNextAudioBlock(GraphTime aTime) {
uint64_t block = aTime >> WEBAUDIO_BLOCK_SIZE_BITS;
uint64_t nextBlock = block + 1;
GraphTime nextTime = nextBlock << WEBAUDIO_BLOCK_SIZE_BITS;
return nextTime;
}
void MediaTrackGraphImpl::ProduceDataForTracksBlockByBlock(
uint32_t aTrackIndex, TrackRate aSampleRate) {
MOZ_ASSERT(OnGraphThread());
MOZ_ASSERT(aTrackIndex <= mFirstCycleBreaker,
"Cycle breaker is not AudioNodeTrack?");
while (mProcessedTime < mStateComputedTime) {
GraphTime next = RoundUpToNextAudioBlock(mProcessedTime);
for (uint32_t i = mFirstCycleBreaker; i < mTracks.Length(); ++i) {
auto nt = static_cast<AudioNodeTrack*>(mTracks[i]);
MOZ_ASSERT(nt->AsAudioNodeTrack());
nt->ProduceOutputBeforeInput(mProcessedTime);
}
for (uint32_t i = aTrackIndex; i < mTracks.Length(); ++i) {
ProcessedMediaTrack* pt = mTracks[i]->AsProcessedTrack();
if (pt) {
pt->ProcessInput(
mProcessedTime, next,
(next == mStateComputedTime) ? ProcessedMediaTrack::ALLOW_END : 0);
}
}
mProcessedTime = next;
}
NS_ASSERTION(mProcessedTime == mStateComputedTime,
"Something went wrong with rounding to block boundaries");
}
void MediaTrackGraphImpl::RunMessageAfterProcessing(
UniquePtr<ControlMessage> aMessage) {
MOZ_ASSERT(OnGraphThread());
if (mFrontMessageQueue.IsEmpty()) {
mFrontMessageQueue.AppendElement();
}
// Only one block is used for messages from the graph thread.
MOZ_ASSERT(mFrontMessageQueue.Length() == 1);
mFrontMessageQueue[0].mMessages.AppendElement(std::move(aMessage));
}
void MediaTrackGraphImpl::RunMessagesInQueue() {
TRACE_AUDIO_CALLBACK();
MOZ_ASSERT(OnGraphThread());
// 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 < mFrontMessageQueue.Length(); ++i) {
nsTArray<UniquePtr<ControlMessage>>& messages =
mFrontMessageQueue[i].mMessages;
for (uint32_t j = 0; j < messages.Length(); ++j) {
messages[j]->Run();
}
}
mFrontMessageQueue.Clear();
}
void MediaTrackGraphImpl::UpdateGraph(GraphTime aEndBlockingDecisions) {
TRACE_AUDIO_CALLBACK();
MOZ_ASSERT(OnGraphThread());
MOZ_ASSERT(aEndBlockingDecisions >= mProcessedTime);
// The next state computed time can be the same as the previous: it
// means the driver would have been blocking indefinitly, but the graph has
// been woken up right after having been to sleep.
MOZ_ASSERT(aEndBlockingDecisions >= mStateComputedTime);
UpdateTrackOrder();
bool ensureNextIteration = false;
for (MediaTrack* track : mTracks) {
if (SourceMediaTrack* is = track->AsSourceTrack()) {
ensureNextIteration |= is->PullNewData(aEndBlockingDecisions);
is->ExtractPendingInput(mStateComputedTime, aEndBlockingDecisions);
}
if (track->mEnded) {
// The track's not suspended, and since it's ended, underruns won't
// stop it playing out. So there's no blocking other than what we impose
// here.
GraphTime endTime = track->GetEnd() + track->mStartTime;
if (endTime <= mStateComputedTime) {
LOG(LogLevel::Verbose,
("%p: MediaTrack %p is blocked due to being ended", this, track));
track->mStartBlocking = mStateComputedTime;
} else {
LOG(LogLevel::Verbose,
("%p: MediaTrack %p has ended, but is not blocked yet (current "
"time %f, end at %f)",
this, track, MediaTimeToSeconds(mStateComputedTime),
MediaTimeToSeconds(endTime)));
// Data can't be added to a ended track, so underruns are irrelevant.
MOZ_ASSERT(endTime <= aEndBlockingDecisions);
track->mStartBlocking = endTime;
}
} else {
track->mStartBlocking = WillUnderrun(track, aEndBlockingDecisions);
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
if (SourceMediaTrack* s = track->AsSourceTrack()) {
if (s->Ended()) {
continue;
}
{
MutexAutoLock lock(s->mMutex);
if (!s->mUpdateTrack->mPullingEnabled) {
// The invariant that data must be provided is only enforced when
// pulling.
continue;
}
}
if (track->GetEnd() <
track->GraphTimeToTrackTime(aEndBlockingDecisions)) {
LOG(LogLevel::Error,
("%p: SourceMediaTrack %p (%s) is live and pulled, "
"but wasn't fed "
"enough data. TrackListeners=%zu. Track-end=%f, "
"Iteration-end=%f",
this, track,
(track->mType == MediaSegment::AUDIO ? "audio" : "video"),
track->mTrackListeners.Length(),
MediaTimeToSeconds(track->GetEnd()),
MediaTimeToSeconds(
track->GraphTimeToTrackTime(aEndBlockingDecisions))));
MOZ_DIAGNOSTIC_ASSERT(false,
"A non-ended SourceMediaTrack wasn't fed "
"enough data by NotifyPull");
}
}
#endif /* MOZ_DIAGNOSTIC_ASSERT_ENABLED */
}
}
for (MediaTrack* track : mSuspendedTracks) {
track->mStartBlocking = mStateComputedTime;
}
// If the loop is woken up so soon that IterationEnd() barely advances or
// if an offline graph is not currently rendering, we end up having
// aEndBlockingDecisions == mStateComputedTime.
// Since the process interval [mStateComputedTime, aEndBlockingDecision) is
// empty, Process() will not find any unblocked track and so will not
// ensure another iteration. If the graph should be rendering, then ensure
// another iteration to render.
if (ensureNextIteration || (aEndBlockingDecisions == mStateComputedTime &&
mStateComputedTime < mEndTime)) {
EnsureNextIteration();
}
}
void MediaTrackGraphImpl::Process(AudioMixer* aMixer) {
TRACE_AUDIO_CALLBACK();
MOZ_ASSERT(OnGraphThread());
// Play track contents.
bool allBlockedForever = true;
// True when we've done ProcessInput for all processed tracks.
bool doneAllProducing = false;
const GraphTime oldProcessedTime = mProcessedTime;
// Figure out what each track wants to do
for (uint32_t i = 0; i < mTracks.Length(); ++i) {
MediaTrack* track = mTracks[i];
if (!doneAllProducing) {
ProcessedMediaTrack* pt = track->AsProcessedTrack();
if (pt) {
AudioNodeTrack* n = track->AsAudioNodeTrack();
if (n) {
#ifdef DEBUG
// Verify that the sampling rate for all of the following tracks is
// the same
for (uint32_t j = i + 1; j < mTracks.Length(); ++j) {
AudioNodeTrack* nextTrack = mTracks[j]->AsAudioNodeTrack();
if (nextTrack) {
MOZ_ASSERT(n->mSampleRate == nextTrack->mSampleRate,
"All AudioNodeTracks in the graph must have the same "
"sampling rate");
}
}
#endif
// Since an AudioNodeTrack is present, go ahead and
// produce audio block by block for all the rest of the tracks.
ProduceDataForTracksBlockByBlock(i, n->mSampleRate);
doneAllProducing = true;
} else {
pt->ProcessInput(mProcessedTime, mStateComputedTime,
ProcessedMediaTrack::ALLOW_END);
// Assert that a live track produced enough data
MOZ_ASSERT_IF(!track->mEnded,
track->GetEnd() >= GraphTimeToTrackTimeWithBlocking(
track, mStateComputedTime));
}
}
}
if (track->mStartBlocking > oldProcessedTime) {
allBlockedForever = false;
}
}
mProcessedTime = mStateComputedTime;
if (aMixer) {
MOZ_ASSERT(mRealtime, "If there's a mixer, this graph must be realtime");
aMixer->StartMixing();
// This is the number of frames that are written to the output buffer, for
// this iteration.
TrackTime ticksPlayed = 0;
for (auto& t : mAudioOutputs) {
TrackTime ticksPlayedForThisTrack =
PlayAudio(aMixer, t, oldProcessedTime);
if (ticksPlayed == 0) {
ticksPlayed = ticksPlayedForThisTrack;
} else {
MOZ_ASSERT(
!ticksPlayedForThisTrack || ticksPlayedForThisTrack == ticksPlayed,
"Each track should have the same number of frames.");
}
}
if (ticksPlayed == 0) {
// Nothing was played, so the mixer doesn't know how many frames were
// processed. We still tell it so AudioCallbackDriver knows how much has
// been processed. (bug 1406027)
aMixer->Mix(
nullptr,
CurrentDriver()->AsAudioCallbackDriver()->OutputChannelCount(),
mStateComputedTime - oldProcessedTime, mSampleRate);
}
aMixer->FinishMixing();
}
if (!allBlockedForever) {
EnsureNextIteration();
}
}
bool MediaTrackGraphImpl::UpdateMainThreadState() {
MOZ_ASSERT(OnGraphThread());
if (mForceShutDown) {
for (MediaTrack* track : AllTracks()) {
track->NotifyForcedShutdown();
}
}
MonitorAutoLock lock(mMonitor);
bool finalUpdate =
mForceShutDown || (IsEmpty() && mBackMessageQueue.IsEmpty());
PrepareUpdatesToMainThreadState(finalUpdate);
if (finalUpdate) {
// Enter shutdown mode when this iteration is completed.
// No need to Destroy tracks here. The main-thread owner of each
// track is responsible for calling Destroy on them.
return false;
}
SwapMessageQueues();
return true;
}
auto MediaTrackGraphImpl::OneIteration(GraphTime aStateEnd,
GraphTime aIterationEnd,
AudioMixer* aMixer) -> IterationResult {
if (mGraphRunner) {
return mGraphRunner->OneIteration(aStateEnd, aIterationEnd, aMixer);
}
return OneIterationImpl(aStateEnd, aIterationEnd, aMixer);
}
auto MediaTrackGraphImpl::OneIterationImpl(GraphTime aStateEnd,
GraphTime aIterationEnd,
AudioMixer* aMixer)
-> IterationResult {
TRACE_AUDIO_CALLBACK();
mIterationEndTime = aIterationEnd;
if (SoftRealTimeLimitReached()) {
DemoteThreadFromRealTime();
}
// Changes to LIFECYCLE_RUNNING occur before starting or reviving the graph
// thread, and so the monitor need not be held to check mLifecycleState.
// LIFECYCLE_THREAD_NOT_STARTED is possible when shutting down offline
// graphs that have not started.
MOZ_DIAGNOSTIC_ASSERT(mLifecycleState <= LIFECYCLE_RUNNING);
MOZ_ASSERT(OnGraphThread());
WebCore::DenormalDisabler disabler;
// Process graph message from the main thread for this iteration.
RunMessagesInQueue();
// Process MessagePort events.
// These require a single thread, which has an nsThread with an event queue.
if (mGraphRunner || !mRealtime) {
NS_ProcessPendingEvents(nullptr);
}
GraphTime stateEnd = std::min(aStateEnd, GraphTime(mEndTime));
UpdateGraph(stateEnd);
mStateComputedTime = stateEnd;
GraphTime oldProcessedTime = mProcessedTime;
Process(aMixer);
MOZ_ASSERT(mProcessedTime == stateEnd);
UpdateCurrentTimeForTracks(oldProcessedTime);
ProcessChunkMetadata(oldProcessedTime);
// Process graph messages queued from RunMessageAfterProcessing() on this
// thread during the iteration.
RunMessagesInQueue();
if (!UpdateMainThreadState()) {
if (Switching()) {
// We'll never get to do this switch. Clear mNextDriver to break the
// ref-cycle graph->nextDriver->currentDriver->graph.
SwitchAtNextIteration(nullptr);
}
return IterationResult::CreateStop(
NewRunnableMethod("MediaTrackGraphImpl::SignalMainThreadCleanup", this,
&MediaTrackGraphImpl::SignalMainThreadCleanup));
}
if (Switching()) {
RefPtr<GraphDriver> nextDriver = std::move(mNextDriver);
return IterationResult::CreateSwitchDriver(
nextDriver, NewRunnableMethod<StoreRefPtrPassByPtr<GraphDriver>>(
"MediaTrackGraphImpl::SetCurrentDriver", this,
&MediaTrackGraphImpl::SetCurrentDriver, nextDriver));
}
return IterationResult::CreateStillProcessing();
}
void MediaTrackGraphImpl::ApplyTrackUpdate(TrackUpdate* aUpdate) {
MOZ_ASSERT(NS_IsMainThread());
mMonitor.AssertCurrentThreadOwns();
MediaTrack* track = aUpdate->mTrack;
if (!track) return;
track->mMainThreadCurrentTime = aUpdate->mNextMainThreadCurrentTime;
track->mMainThreadEnded = aUpdate->mNextMainThreadEnded;
if (track->ShouldNotifyTrackEnded()) {
track->NotifyMainThreadListeners();
}
}
void MediaTrackGraphImpl::ForceShutDown() {
MOZ_ASSERT(NS_IsMainThread(), "Must be called on main thread");
LOG(LogLevel::Debug, ("%p: MediaTrackGraph::ForceShutdown", this));
if (mShutdownBlocker) {
// Avoid waiting forever for a graph to shut down
// synchronously. Reports are that some 3rd-party audio drivers
// occasionally hang in shutdown (both for us and Chrome).
NS_NewTimerWithCallback(
getter_AddRefs(mShutdownTimer), this,
MediaTrackGraph::AUDIO_CALLBACK_DRIVER_SHUTDOWN_TIMEOUT,
nsITimer::TYPE_ONE_SHOT);
}
class Message final : public ControlMessage {
public:
explicit Message(MediaTrackGraphImpl* aGraph)
: ControlMessage(nullptr), mGraph(aGraph) {}
void Run() override { mGraph->mForceShutDown = true; }
// The graph owns this message.
MediaTrackGraphImpl* MOZ_NON_OWNING_REF mGraph;
};
if (mMainThreadTrackCount > 0 || mMainThreadPortCount > 0) {
// If both the track and port counts are zero, the regular shutdown
// sequence will progress shortly to shutdown threads and destroy the graph.
AppendMessage(MakeUnique<Message>(this));
}
}
NS_IMETHODIMP
MediaTrackGraphImpl::Notify(nsITimer* aTimer) {
MOZ_ASSERT(NS_IsMainThread());
NS_ASSERTION(!mShutdownBlocker,
"MediaTrackGraph took too long to shut down!");
// Sigh, graph took too long to shut down. Stop blocking system
// shutdown and hope all is well.
RemoveShutdownBlocker();
return NS_OK;
}
void MediaTrackGraphImpl::AddShutdownBlocker() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mShutdownBlocker);
class Blocker : public media::ShutdownBlocker {
const RefPtr<MediaTrackGraphImpl> mGraph;
public:
Blocker(MediaTrackGraphImpl* aGraph, const nsString& aName)
: media::ShutdownBlocker(aName), mGraph(aGraph) {}
NS_IMETHOD
BlockShutdown(nsIAsyncShutdownClient* aProfileBeforeChange) override {
mGraph->ForceShutDown();
return NS_OK;
}
};
// Blocker names must be distinct.
nsString blockerName;
blockerName.AppendPrintf("MediaTrackGraph %p shutdown", this);
mShutdownBlocker = MakeAndAddRef<Blocker>(this, blockerName);
nsresult rv = media::GetShutdownBarrier()->AddBlocker(
mShutdownBlocker, NS_LITERAL_STRING(__FILE__), __LINE__,
NS_LITERAL_STRING("MediaTrackGraph shutdown"));
MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
}
void MediaTrackGraphImpl::RemoveShutdownBlocker() {
if (!mShutdownBlocker) {
return;
}
media::GetShutdownBarrier()->RemoveBlocker(mShutdownBlocker);
mShutdownBlocker = nullptr;
}
NS_IMETHODIMP
MediaTrackGraphImpl::GetName(nsACString& aName) {
aName.AssignLiteral("MediaTrackGraphImpl");
return NS_OK;
}
namespace {
class MediaTrackGraphShutDownRunnable : public Runnable {
public:
explicit MediaTrackGraphShutDownRunnable(MediaTrackGraphImpl* aGraph)
: Runnable("MediaTrackGraphShutDownRunnable"), mGraph(aGraph) {}
// MOZ_CAN_RUN_SCRIPT_BOUNDARY until Runnable::Run is MOZ_CAN_RUN_SCRIPT.
// See bug 1535398.
MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mGraph->mGraphDriverRunning && mGraph->mDriver,
"We should know the graph thread control loop isn't running!");
LOG(LogLevel::Debug, ("%p: Shutting down graph", mGraph.get()));
// We've asserted the graph isn't running. Use mDriver instead of
// CurrentDriver to avoid thread-safety checks
#if 0 // AudioCallbackDrivers are released asynchronously anyways
// XXX a better test would be have setting mGraphDriverRunning make sure
// any current callback has finished and block future ones -- or just
// handle it all in Shutdown()!
if (mGraph->mDriver->AsAudioCallbackDriver()) {
MOZ_ASSERT(!mGraph->mDriver->AsAudioCallbackDriver()->InCallback());
}
#endif
if (mGraph->mGraphRunner) {
RefPtr<GraphRunner>(mGraph->mGraphRunner)->Shutdown();
}
// This will wait until it's shutdown since
// we'll start tearing down the graph after this
RefPtr<GraphDriver>(mGraph->mDriver)->Shutdown();
// Release the driver now so that an AudioCallbackDriver will release its
// SharedThreadPool reference. Each SharedThreadPool reference must be
// released before SharedThreadPool::SpinUntilEmpty() runs on
// xpcom-shutdown-threads. Don't wait for GC/CC to release references to
// objects owning tracks, or for expiration of mGraph->mShutdownTimer,
// which won't otherwise release its reference on the graph until
// nsTimerImpl::Shutdown(), which runs after xpcom-shutdown-threads.
mGraph->SetCurrentDriver(nullptr);
// Safe to access these without the monitor since the graph isn't running.
// We may be one of several graphs. Drop ticket to eventually unblock
// shutdown.
if (mGraph->mShutdownTimer && !mGraph->mShutdownBlocker) {
MOZ_ASSERT(
false,
"AudioCallbackDriver took too long to shut down and we let shutdown"
" continue - freezing and leaking");
// The timer fired, so we may be deeper in shutdown now. Block any
// further teardown and just leak, for safety.
return NS_OK;
}
// mGraph's thread is not running so it's OK to do whatever here
for (MediaTrack* track : mGraph->AllTracks()) {
// Clean up all MediaSegments since we cannot release Images too
// late during shutdown. Also notify listeners that they were removed
// so they can clean up any gfx resources.
track->RemoveAllResourcesAndListenersImpl();
}
MOZ_ASSERT(mGraph->mUpdateRunnables.IsEmpty());
mGraph->mPendingUpdateRunnables.Clear();
mGraph->RemoveShutdownBlocker();
// We can't block past the final LIFECYCLE_WAITING_FOR_TRACK_DESTRUCTION
// stage, since completion of that stage requires all tracks to be freed,
// which requires shutdown to proceed.
if (mGraph->IsEmpty()) {
// mGraph is no longer needed, so delete it.
mGraph->Destroy();
} else {
// The graph is not empty. We must be in a forced shutdown, either for
// process shutdown or a non-realtime graph that has finished
// processing. Some later AppendMessage will detect that the graph has
// been emptied, and delete it.
NS_ASSERTION(mGraph->mForceShutDown, "Not in forced shutdown?");
mGraph->LifecycleStateRef() =
MediaTrackGraphImpl::LIFECYCLE_WAITING_FOR_TRACK_DESTRUCTION;
}
return NS_OK;
}
private:
RefPtr<MediaTrackGraphImpl> mGraph;
};
class MediaTrackGraphStableStateRunnable : public Runnable {
public:
explicit MediaTrackGraphStableStateRunnable(MediaTrackGraphImpl* aGraph,
bool aSourceIsMTG)
: Runnable("MediaTrackGraphStableStateRunnable"),
mGraph(aGraph),
mSourceIsMTG(aSourceIsMTG) {}
NS_IMETHOD Run() override {
TRACE();
if (mGraph) {
mGraph->RunInStableState(mSourceIsMTG);
}
return NS_OK;
}
private:
RefPtr<MediaTrackGraphImpl> mGraph;
bool mSourceIsMTG;
};
/*
* Control messages forwarded from main thread to graph manager thread
*/
class CreateMessage : public ControlMessage {
public:
explicit CreateMessage(MediaTrack* aTrack) : ControlMessage(aTrack) {}
void Run() override { mTrack->GraphImpl()->AddTrackGraphThread(mTrack); }
void RunDuringShutdown() override {
// Make sure to run this message during shutdown too, to make sure
// that we balance the number of tracks registered with the graph
// as they're destroyed during shutdown.
Run();
}
};
} // namespace
void MediaTrackGraphImpl::RunInStableState(bool aSourceIsMTG) {
MOZ_ASSERT(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<UniquePtr<ControlMessage>> controlMessagesToRunDuringShutdown;
{
MonitorAutoLock lock(mMonitor);
if (aSourceIsMTG) {
MOZ_ASSERT(mPostedRunInStableStateEvent);
mPostedRunInStableStateEvent = false;
}
// This should be kept in sync with the LifecycleState enum in
// MediaTrackGraphImpl.h
const char* LifecycleState_str[] = {
"LIFECYCLE_THREAD_NOT_STARTED", "LIFECYCLE_RUNNING",
"LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP",
"LIFECYCLE_WAITING_FOR_THREAD_SHUTDOWN",
"LIFECYCLE_WAITING_FOR_TRACK_DESTRUCTION"};
if (LifecycleStateRef() != LIFECYCLE_RUNNING) {
LOG(LogLevel::Debug,
("%p: Running stable state callback. Current state: %s", this,
LifecycleState_str[LifecycleStateRef()]));
}
runnables.SwapElements(mUpdateRunnables);
for (uint32_t i = 0; i < mTrackUpdates.Length(); ++i) {
TrackUpdate* update = &mTrackUpdates[i];
if (update->mTrack) {
ApplyTrackUpdate(update);
}
}
mTrackUpdates.Clear();
mMainThreadGraphTime = mNextMainThreadGraphTime;
if (mCurrentTaskMessageQueue.IsEmpty()) {
if (LifecycleStateRef() == 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.
// 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.
LifecycleStateRef() = LIFECYCLE_WAITING_FOR_THREAD_SHUTDOWN;
LOG(LogLevel::Debug,
("%p: Sending MediaTrackGraphShutDownRunnable", this));
nsCOMPtr<nsIRunnable> event = new MediaTrackGraphShutDownRunnable(this);
mAbstractMainThread->Dispatch(event.forget());
}
} else {
if (LifecycleStateRef() <= LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP) {
MessageBlock* block = mBackMessageQueue.AppendElement();
block->mMessages.SwapElements(mCurrentTaskMessageQueue);
EnsureNextIteration();
}
// If this MediaTrackGraph has entered regular (non-forced) shutdown it
// is not able to process any more messages. Those messages being added to
// the graph in the first place is an error.
MOZ_DIAGNOSTIC_ASSERT(mForceShutDown ||
LifecycleStateRef() <
LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP);
}
if (LifecycleStateRef() == LIFECYCLE_THREAD_NOT_STARTED) {
// Start the driver now. We couldn't start it earlier because the graph
// might exit immediately on finding it has no tracks. The first message
// for a new graph must create a track. Ensure that his message runs on
// the first iteration.
MOZ_ASSERT(MessagesQueued());
SwapMessageQueues();
LOG(LogLevel::Debug,
("%p: Starting a graph with a %s", this,
CurrentDriver()->AsAudioCallbackDriver() ? "AudioCallbackDriver"
: "SystemClockDriver"));
LifecycleStateRef() = LIFECYCLE_RUNNING;
mGraphDriverRunning = true;
RefPtr<GraphDriver> driver = CurrentDriver();
driver->Start();
// It's not safe to Shutdown() a thread from StableState, and
// releasing this may shutdown a SystemClockDriver thread.
// Proxy the release to outside of StableState.
NS_ReleaseOnMainThreadSystemGroup("MediaTrackGraphImpl::CurrentDriver",
driver.forget(),
true); // always proxy
}
if (LifecycleStateRef() == LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP &&
mForceShutDown) {
// Defer calls to RunDuringShutdown() to happen while mMonitor is not
// held.
for (uint32_t i = 0; i < mBackMessageQueue.Length(); ++i) {
MessageBlock& mb = mBackMessageQueue[i];
controlMessagesToRunDuringShutdown.AppendElements(
std::move(mb.mMessages));
}
mBackMessageQueue.Clear();
MOZ_ASSERT(mCurrentTaskMessageQueue.IsEmpty());
// Stop MediaTrackGraph threads.
LifecycleStateRef() = LIFECYCLE_WAITING_FOR_THREAD_SHUTDOWN;
nsCOMPtr<nsIRunnable> event = new MediaTrackGraphShutDownRunnable(this);
mAbstractMainThread->Dispatch(event.forget());
}
mGraphDriverRunning = LifecycleStateRef() == LIFECYCLE_RUNNING;
}
// Make sure we get a new current time in the next event loop task
if (!aSourceIsMTG) {
MOZ_ASSERT(mPostedRunInStableState);
mPostedRunInStableState = false;
}
for (uint32_t i = 0; i < controlMessagesToRunDuringShutdown.Length(); ++i) {
controlMessagesToRunDuringShutdown[i]->RunDuringShutdown();
}
#ifdef DEBUG
mCanRunMessagesSynchronously =
!mGraphDriverRunning &&
LifecycleStateRef() >= LIFECYCLE_WAITING_FOR_THREAD_SHUTDOWN;
#endif
for (uint32_t i = 0; i < runnables.Length(); ++i) {
runnables[i]->Run();
}
}
void MediaTrackGraphImpl::EnsureRunInStableState() {
MOZ_ASSERT(NS_IsMainThread(), "main thread only");
if (mPostedRunInStableState) return;
mPostedRunInStableState = true;
nsCOMPtr<nsIRunnable> event =
new MediaTrackGraphStableStateRunnable(this, false);
nsContentUtils::RunInStableState(event.forget());
}
void MediaTrackGraphImpl::EnsureStableStateEventPosted() {
MOZ_ASSERT(OnGraphThread());
mMonitor.AssertCurrentThreadOwns();
if (mPostedRunInStableStateEvent) return;
mPostedRunInStableStateEvent = true;
nsCOMPtr<nsIRunnable> event =
new MediaTrackGraphStableStateRunnable(this, true);
mAbstractMainThread->Dispatch(event.forget());
}
void MediaTrackGraphImpl::SignalMainThreadCleanup() {
MOZ_ASSERT(mDriver->OnThread());
MonitorAutoLock lock(mMonitor);
// LIFECYCLE_THREAD_NOT_STARTED is possible when shutting down offline
// graphs that have not started.
MOZ_DIAGNOSTIC_ASSERT(mLifecycleState <= LIFECYCLE_RUNNING);
LOG(LogLevel::Debug,
("%p: MediaTrackGraph waiting for main thread cleanup", this));
LifecycleStateRef() =
MediaTrackGraphImpl::LIFECYCLE_WAITING_FOR_MAIN_THREAD_CLEANUP;
EnsureStableStateEventPosted();
}
void MediaTrackGraphImpl::AppendMessage(UniquePtr<ControlMessage> aMessage) {
MOZ_ASSERT(NS_IsMainThread(), "main thread only");
MOZ_ASSERT_IF(aMessage->GetTrack(), !aMessage->GetTrack()->IsDestroyed());
MOZ_DIAGNOSTIC_ASSERT(mMainThreadTrackCount > 0 || mMainThreadPortCount > 0);
if (!mGraphDriverRunning &&
LifecycleStateRef() > 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, or after a non-realtime graph has finished processing.
#ifdef DEBUG
MOZ_ASSERT(mCanRunMessagesSynchronously);
mCanRunMessagesSynchronously = false;
#endif
aMessage->RunDuringShutdown();
#ifdef DEBUG
mCanRunMessagesSynchronously = true;
#endif
if (IsEmpty() &&
LifecycleStateRef() >= LIFECYCLE_WAITING_FOR_TRACK_DESTRUCTION) {
Destroy();
}
return;
}
mCurrentTaskMessageQueue.AppendElement(std::move(aMessage));
EnsureRunInStableState();
}
void MediaTrackGraphImpl::Dispatch(already_AddRefed<nsIRunnable>&& aRunnable) {
mAbstractMainThread->Dispatch(std::move(aRunnable));
}
MediaTrack::MediaTrack(TrackRate aSampleRate, MediaSegment::Type aType,
MediaSegment* aSegment)
: mSampleRate(aSampleRate),
mType(aType),
mSegment(aSegment),
mStartTime(0),
mForgottenTime(0),
mEnded(false),
mNotifiedEnded(false),
mDisabledMode(DisabledTrackMode::ENABLED),
mStartBlocking(GRAPH_TIME_MAX),
mSuspendedCount(0),
mMainThreadCurrentTime(0),
mMainThreadEnded(false),
mEndedNotificationSent(false),
mMainThreadDestroyed(false),
mGraph(nullptr) {
MOZ_COUNT_CTOR(MediaTrack);
MOZ_ASSERT_IF(mSegment, mSegment->GetType() == aType);
}
MediaTrack::~MediaTrack() {
MOZ_COUNT_DTOR(MediaTrack);
NS_ASSERTION(mMainThreadDestroyed, "Should have been destroyed already");
NS_ASSERTION(mMainThreadListeners.IsEmpty(),
"All main thread listeners should have been removed");
}
size_t MediaTrack::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
size_t amount = 0;
// Not owned:
// - mGraph - Not reported here
// - mConsumers - elements
// Future:
// - mLastPlayedVideoFrame
// - mTrackListeners - elements
amount += mTrackListeners.ShallowSizeOfExcludingThis(aMallocSizeOf);
amount += mMainThreadListeners.ShallowSizeOfExcludingThis(aMallocSizeOf);
amount += mConsumers.ShallowSizeOfExcludingThis(aMallocSizeOf);
return amount;
}
size_t MediaTrack::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
void MediaTrack::IncrementSuspendCount() {
++mSuspendedCount;
if (mSuspendedCount == 1) {
for (uint32_t i = 0; i < mConsumers.Length(); ++i) {
mConsumers[i]->Suspended();
}
}
}
void MediaTrack::DecrementSuspendCount() {
NS_ASSERTION(mSuspendedCount > 0, "Suspend count underrun");
--mSuspendedCount;
if (mSuspendedCount == 0) {
for (uint32_t i = 0; i < mConsumers.Length(); ++i) {
mConsumers[i]->Resumed();
}
}
}
MediaTrackGraphImpl* MediaTrack::GraphImpl() { return mGraph; }
const MediaTrackGraphImpl* MediaTrack::GraphImpl() const { return mGraph; }
MediaTrackGraph* MediaTrack::Graph() { return mGraph; }
const MediaTrackGraph* MediaTrack::Graph() const { return mGraph; }
void MediaTrack::SetGraphImpl(MediaTrackGraphImpl* aGraph) {
MOZ_ASSERT(!mGraph, "Should only be called once");
MOZ_ASSERT(mSampleRate == aGraph->GraphRate());
mGraph = aGraph;
}
void MediaTrack::SetGraphImpl(MediaTrackGraph* aGraph) {
MediaTrackGraphImpl* graph = static_cast<MediaTrackGraphImpl*>(aGraph);
SetGraphImpl(graph);
}
TrackTime MediaTrack::GraphTimeToTrackTime(GraphTime aTime) const {
NS_ASSERTION(mStartBlocking == GraphImpl()->mStateComputedTime ||
aTime <= mStartBlocking,
"Incorrectly ignoring blocking!");
return aTime - mStartTime;
}
GraphTime MediaTrack::TrackTimeToGraphTime(TrackTime aTime) const {
NS_ASSERTION(mStartBlocking == GraphImpl()->mStateComputedTime ||
aTime + mStartTime <= mStartBlocking,
"Incorrectly ignoring blocking!");
return aTime + mStartTime;
}
TrackTime MediaTrack::GraphTimeToTrackTimeWithBlocking(GraphTime aTime) const {
return GraphImpl()->GraphTimeToTrackTimeWithBlocking(this, aTime);
}
void MediaTrack::RemoveAllResourcesAndListenersImpl() {
GraphImpl()->AssertOnGraphThreadOrNotRunning();
auto trackListeners(mTrackListeners);
for (auto& l : trackListeners) {
l->NotifyRemoved(Graph());
}
mTrackListeners.Clear();
RemoveAllDirectListenersImpl();
if (mSegment) {
mSegment->Clear();
}
}
void MediaTrack::DestroyImpl() {
for (int32_t i = mConsumers.Length() - 1; i >= 0; --i) {
mConsumers[i]->Disconnect();
}
if (mSegment) {
mSegment->Clear();
}
mGraph = nullptr;
}
void MediaTrack::Destroy() {
// Keep this track alive until we leave this method
RefPtr<MediaTrack> kungFuDeathGrip = this;
class Message : public ControlMessage {
public:
explicit Message(MediaTrack* aTrack) : ControlMessage(aTrack) {}
void Run() override {
mTrack->RemoveAllResourcesAndListenersImpl();
auto graph = mTrack->GraphImpl();
mTrack->DestroyImpl();
graph->RemoveTrackGraphThread(mTrack);
}
void RunDuringShutdown() override { Run(); }
};
// Keep a reference to the graph, since Message might RunDuringShutdown()
// synchronously and make GraphImpl() invalid.
RefPtr<MediaTrackGraphImpl> graph = GraphImpl();
graph->AppendMessage(MakeUnique<Message>(this));
graph->RemoveTrack(this);
// Message::RunDuringShutdown may have removed this track from the graph,
// but our kungFuDeathGrip above will have kept this track alive if
// necessary.
mMainThreadDestroyed = true;
}
TrackTime MediaTrack::GetEnd() const {
return mSegment ? mSegment->GetDuration() : 0;
}
void MediaTrack::AddAudioOutput(void* aKey) {
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, void* aKey)
: ControlMessage(aTrack), mKey(aKey) {}
void Run() override { mTrack->AddAudioOutputImpl(mKey); }
void* mKey;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aKey));
}
void MediaTrackGraphImpl::SetAudioOutputVolume(MediaTrack* aTrack, void* aKey,
float aVolume) {
for (auto& tkv : mAudioOutputs) {
if (tkv.mKey == aKey && aTrack == tkv.mTrack) {
tkv.mVolume = aVolume;
return;
}
}
MOZ_CRASH("Audio stream key not found when setting the volume.");
}
void MediaTrack::SetAudioOutputVolumeImpl(void* aKey, float aVolume) {
MOZ_ASSERT(GraphImpl()->OnGraphThread());
GraphImpl()->SetAudioOutputVolume(this, aKey, aVolume);
}
void MediaTrack::SetAudioOutputVolume(void* aKey, float aVolume) {
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, void* aKey, float aVolume)
: ControlMessage(aTrack), mKey(aKey), mVolume(aVolume) {}
void Run() override { mTrack->SetAudioOutputVolumeImpl(mKey, mVolume); }
void* mKey;
float mVolume;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aKey, aVolume));
}
void MediaTrack::AddAudioOutputImpl(void* aKey) {
LOG(LogLevel::Info, ("MediaTrack %p adding AudioOutput", this));
GraphImpl()->RegisterAudioOutput(this, aKey);
}
void MediaTrack::RemoveAudioOutputImpl(void* aKey) {
LOG(LogLevel::Info, ("MediaTrack %p removing AudioOutput", this));
GraphImpl()->UnregisterAudioOutput(this, aKey);
}
void MediaTrack::RemoveAudioOutput(void* aKey) {
class Message : public ControlMessage {
public:
explicit Message(MediaTrack* aTrack, void* aKey)
: ControlMessage(aTrack), mKey(aKey) {}
void Run() override { mTrack->RemoveAudioOutputImpl(mKey); }
void* mKey;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aKey));
}
void MediaTrack::Suspend() {
class Message : public ControlMessage {
public:
explicit Message(MediaTrack* aTrack) : ControlMessage(aTrack) {}
void Run() override { mTrack->GraphImpl()->IncrementSuspendCount(mTrack); }
};
// This can happen if this method has been called asynchronously, and the
// track has been destroyed since then.
if (mMainThreadDestroyed) {
return;
}
GraphImpl()->AppendMessage(MakeUnique<Message>(this));
}
void MediaTrack::Resume() {
class Message : public ControlMessage {
public:
explicit Message(MediaTrack* aTrack) : ControlMessage(aTrack) {}
void Run() override { mTrack->GraphImpl()->DecrementSuspendCount(mTrack); }
};
// This can happen if this method has been called asynchronously, and the
// track has been destroyed since then.
if (mMainThreadDestroyed) {
return;
}
GraphImpl()->AppendMessage(MakeUnique<Message>(this));
}
void MediaTrack::AddListenerImpl(
already_AddRefed<MediaTrackListener> aListener) {
RefPtr<MediaTrackListener> l(aListener);
mTrackListeners.AppendElement(std::move(l));
PrincipalHandle lastPrincipalHandle = mSegment->GetLastPrincipalHandle();
mTrackListeners.LastElement()->NotifyPrincipalHandleChanged(
Graph(), lastPrincipalHandle);
if (mNotifiedEnded) {
mTrackListeners.LastElement()->NotifyEnded(Graph());
}
if (mDisabledMode == DisabledTrackMode::SILENCE_BLACK) {
mTrackListeners.LastElement()->NotifyEnabledStateChanged(Graph(), false);
}
}
void MediaTrack::AddListener(MediaTrackListener* aListener) {
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, MediaTrackListener* aListener)
: ControlMessage(aTrack), mListener(aListener) {}
void Run() override { mTrack->AddListenerImpl(mListener.forget()); }
RefPtr<MediaTrackListener> mListener;
};
MOZ_ASSERT(mSegment, "Segment-less tracks do not support listeners");
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aListener));
}
void MediaTrack::RemoveListenerImpl(MediaTrackListener* aListener) {
for (size_t i = 0; i < mTrackListeners.Length(); ++i) {
if (mTrackListeners[i] == aListener) {
mTrackListeners[i]->NotifyRemoved(Graph());
mTrackListeners.RemoveElementAt(i);
return;
}
}
}
RefPtr<GenericPromise> MediaTrack::RemoveListener(
MediaTrackListener* aListener) {
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, MediaTrackListener* aListener)
: ControlMessage(aTrack), mListener(aListener) {}
void Run() override {
mTrack->RemoveListenerImpl(mListener);
mRemovedPromise.Resolve(true, __func__);
}
void RunDuringShutdown() override {
// During shutdown we still want the listener's NotifyRemoved to be
// called, since not doing that might block shutdown of other modules.
Run();
}
RefPtr<MediaTrackListener> mListener;
MozPromiseHolder<GenericPromise> mRemovedPromise;
};
UniquePtr<Message> message = MakeUnique<Message>(this, aListener);
RefPtr<GenericPromise> p = message->mRemovedPromise.Ensure(__func__);
GraphImpl()->AppendMessage(std::move(message));
return p;
}
void MediaTrack::AddDirectListenerImpl(
already_AddRefed<DirectMediaTrackListener> aListener) {
// Base implementation, for tracks that don't support direct track listeners.
RefPtr<DirectMediaTrackListener> listener = aListener;
listener->NotifyDirectListenerInstalled(
DirectMediaTrackListener::InstallationResult::TRACK_NOT_SUPPORTED);
}
void MediaTrack::AddDirectListener(DirectMediaTrackListener* aListener) {
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, DirectMediaTrackListener* aListener)
: ControlMessage(aTrack), mListener(aListener) {}
void Run() override { mTrack->AddDirectListenerImpl(mListener.forget()); }
RefPtr<DirectMediaTrackListener> mListener;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aListener));
}
void MediaTrack::RemoveDirectListenerImpl(DirectMediaTrackListener* aListener) {
// Base implementation, the listener was never added so nothing to do.
}
void MediaTrack::RemoveDirectListener(DirectMediaTrackListener* aListener) {
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, DirectMediaTrackListener* aListener)
: ControlMessage(aTrack), mListener(aListener) {}
void Run() override { mTrack->RemoveDirectListenerImpl(mListener); }
void RunDuringShutdown() override {
// During shutdown we still want the listener's
// NotifyDirectListenerUninstalled to be called, since not doing that
// might block shutdown of other modules.
Run();
}
RefPtr<DirectMediaTrackListener> mListener;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aListener));
}
void MediaTrack::RunAfterPendingUpdates(
already_AddRefed<nsIRunnable> aRunnable) {
MOZ_ASSERT(NS_IsMainThread());
MediaTrackGraphImpl* graph = GraphImpl();
nsCOMPtr<nsIRunnable> runnable(aRunnable);
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, already_AddRefed<nsIRunnable> aRunnable)
: ControlMessage(aTrack), mRunnable(aRunnable) {}
void Run() override {
mTrack->Graph()->DispatchToMainThreadStableState(mRunnable.forget());
}
void RunDuringShutdown() override {
// Don't run mRunnable now as it may call AppendMessage() which would
// assume that there are no remaining controlMessagesToRunDuringShutdown.
MOZ_ASSERT(NS_IsMainThread());
mTrack->GraphImpl()->Dispatch(mRunnable.forget());
}
private:
nsCOMPtr<nsIRunnable> mRunnable;
};
graph->AppendMessage(MakeUnique<Message>(this, runnable.forget()));
}
void MediaTrack::SetEnabledImpl(DisabledTrackMode aMode) {
if (aMode == DisabledTrackMode::ENABLED) {
mDisabledMode = DisabledTrackMode::ENABLED;
for (const auto& l : mTrackListeners) {
l->NotifyEnabledStateChanged(Graph(), true);
}
} else {
MOZ_DIAGNOSTIC_ASSERT(
mDisabledMode == DisabledTrackMode::ENABLED,
"Changing disabled track mode for a track is not allowed");
mDisabledMode = aMode;
if (aMode == DisabledTrackMode::SILENCE_BLACK) {
for (const auto& l : mTrackListeners) {
l->NotifyEnabledStateChanged(Graph(), false);
}
}
}
}
void MediaTrack::SetEnabled(DisabledTrackMode aMode) {
class Message : public ControlMessage {
public:
Message(MediaTrack* aTrack, DisabledTrackMode aMode)
: ControlMessage(aTrack), mMode(aMode) {}
void Run() override { mTrack->SetEnabledImpl(mMode); }
DisabledTrackMode mMode;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aMode));
}
void MediaTrack::ApplyTrackDisabling(MediaSegment* aSegment,
MediaSegment* aRawSegment) {
if (mDisabledMode == DisabledTrackMode::ENABLED) {
return;
}
if (mDisabledMode == DisabledTrackMode::SILENCE_BLACK) {
aSegment->ReplaceWithDisabled();
if (aRawSegment) {
aRawSegment->ReplaceWithDisabled();
}
} else if (mDisabledMode == DisabledTrackMode::SILENCE_FREEZE) {
aSegment->ReplaceWithNull();
if (aRawSegment) {
aRawSegment->ReplaceWithNull();
}
} else {
MOZ_CRASH("Unsupported mode");
}
}
void MediaTrack::AddMainThreadListener(
MainThreadMediaTrackListener* aListener) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aListener);
MOZ_ASSERT(!mMainThreadListeners.Contains(aListener));
mMainThreadListeners.AppendElement(aListener);
// If it is not yet time to send the notification, then exit here.
if (!mEndedNotificationSent) {
return;
}
class NotifyRunnable final : public Runnable {
public:
explicit NotifyRunnable(MediaTrack* aTrack)
: Runnable("MediaTrack::NotifyRunnable"), mTrack(aTrack) {}
NS_IMETHOD Run() override {
MOZ_ASSERT(NS_IsMainThread());
mTrack->NotifyMainThreadListeners();
return NS_OK;
}
private:
~NotifyRunnable() {}
RefPtr<MediaTrack> mTrack;
};
nsCOMPtr<nsIRunnable> runnable = new NotifyRunnable(this);
GraphImpl()->Dispatch(runnable.forget());
}
void MediaTrack::AdvanceTimeVaryingValuesToCurrentTime(GraphTime aCurrentTime,
GraphTime aBlockedTime) {
mStartTime += aBlockedTime;
if (!mSegment) {
// No data to be forgotten.
return;
}
TrackTime time = aCurrentTime - mStartTime;
// Only prune if there is a reasonable chunk (50ms @ 48kHz) to forget, so we
// don't spend too much time pruning segments.
const TrackTime minChunkSize = 2400;
if (time < mForgottenTime + minChunkSize) {
return;
}
mForgottenTime = std::min(GetEnd() - 1, time);
mSegment->ForgetUpTo(mForgottenTime);
}
SourceMediaTrack::SourceMediaTrack(MediaSegment::Type aType,
TrackRate aSampleRate)
: MediaTrack(aSampleRate, aType,
aType == MediaSegment::AUDIO
? static_cast<MediaSegment*>(new AudioSegment())
: static_cast<MediaSegment*>(new VideoSegment())),
mMutex("mozilla::media::SourceMediaTrack") {
mUpdateTrack = MakeUnique<TrackData>();
mUpdateTrack->mInputRate = aSampleRate;
mUpdateTrack->mResamplerChannelCount = 0;
mUpdateTrack->mData = UniquePtr<MediaSegment>(mSegment->CreateEmptyClone());
mUpdateTrack->mEnded = false;
mUpdateTrack->mPullingEnabled = false;
}
nsresult SourceMediaTrack::OpenAudioInput(CubebUtils::AudioDeviceID aID,
AudioDataListener* aListener) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(GraphImpl());
MOZ_ASSERT(!mInputListener);
mInputListener = aListener;
return GraphImpl()->OpenAudioInput(aID, aListener);
}
void SourceMediaTrack::CloseAudioInput(Maybe<CubebUtils::AudioDeviceID>& aID) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(GraphImpl());
if (!mInputListener) {
return;
}
GraphImpl()->CloseAudioInput(aID, mInputListener);
mInputListener = nullptr;
}
void SourceMediaTrack::Destroy() {
MOZ_ASSERT(NS_IsMainThread());
Maybe<CubebUtils::AudioDeviceID> id = Nothing();
CloseAudioInput(id);
MediaTrack::Destroy();
}
void SourceMediaTrack::DestroyImpl() {
GraphImpl()->AssertOnGraphThreadOrNotRunning();
for (int32_t i = mConsumers.Length() - 1; i >= 0; --i) {
// Disconnect before we come under mMutex's lock since it can call back
// through RemoveDirectListenerImpl() and deadlock.
mConsumers[i]->Disconnect();
}
// Hold mMutex while mGraph is reset so that other threads holding mMutex
// can null-check know that the graph will not destroyed.
MutexAutoLock lock(mMutex);
mUpdateTrack = nullptr;
MediaTrack::DestroyImpl();
}
void SourceMediaTrack::SetPullingEnabled(bool aEnabled) {
class Message : public ControlMessage {
public:
Message(SourceMediaTrack* aTrack, bool aEnabled)
: ControlMessage(nullptr), mTrack(aTrack), mEnabled(aEnabled) {}
void Run() override {
MutexAutoLock lock(mTrack->mMutex);
if (!mTrack->mUpdateTrack) {
// We can't enable pulling for a track that has ended. We ignore
// this if we're disabling pulling, since shutdown sequences are
// complex. If there's truly an issue we'll have issues enabling anyway.
MOZ_ASSERT_IF(mEnabled, mTrack->mEnded);
return;
}
MOZ_ASSERT(mTrack->mType == MediaSegment::AUDIO,
"Pulling is not allowed for video");
mTrack->mUpdateTrack->mPullingEnabled = mEnabled;
}
SourceMediaTrack* mTrack;
bool mEnabled;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aEnabled));
}
bool SourceMediaTrack::PullNewData(GraphTime aDesiredUpToTime) {
TRACE_AUDIO_CALLBACK_COMMENT("SourceMediaTrack %p", this);
TrackTime t;
TrackTime current;
{
if (mEnded) {
return false;
}
MutexAutoLock lock(mMutex);
if (mUpdateTrack->mEnded) {
return false;
}
if (!mUpdateTrack->mPullingEnabled) {
return false;
}
// Compute how much track time we'll need assuming we don't block
// the track at all.
t = GraphTimeToTrackTime(aDesiredUpToTime);
current = GetEnd() + mUpdateTrack->mData->GetDuration();
}
if (t <= current) {
return false;
}
LOG(LogLevel::Verbose, ("%p: Calling NotifyPull track=%p t=%f current end=%f",
GraphImpl(), this, GraphImpl()->MediaTimeToSeconds(t),
GraphImpl()->MediaTimeToSeconds(current)));
for (auto& l : mTrackListeners) {
l->NotifyPull(Graph(), current, t);
}
return true;
}
/**
* This moves chunks from aIn to aOut. For audio this is simple. For video
* we carry durations over if present, or extend up to aDesiredUpToTime if not.
*
* We also handle "resetters" from captured media elements. This type of source
* pushes future frames into the track, and should it need to remove some, e.g.,
* because of a seek or pause, it tells us by letting time go backwards. Without
* this, tracks would be live for too long after a seek or pause.
*/
static void MoveToSegment(SourceMediaTrack* aTrack, MediaSegment* aIn,
MediaSegment* aOut, TrackTime aCurrentTime,
TrackTime aDesiredUpToTime) {
MOZ_ASSERT(aIn->GetType() == aOut->GetType());
MOZ_ASSERT(aOut->GetDuration() >= aCurrentTime);
MOZ_ASSERT(aDesiredUpToTime >= aCurrentTime);
if (aIn->GetType() == MediaSegment::AUDIO) {
AudioSegment* in = static_cast<AudioSegment*>(aIn);
AudioSegment* out = static_cast<AudioSegment*>(aOut);
TrackTime desiredDurationToMove = aDesiredUpToTime - aCurrentTime;
TrackTime end = std::min(in->GetDuration(), desiredDurationToMove);
out->AppendSlice(*in, 0, end);
in->RemoveLeading(end);
out->ApplyVolume(aTrack->GetVolumeLocked());
} else {
VideoSegment* in = static_cast<VideoSegment*>(aIn);
VideoSegment* out = static_cast<VideoSegment*>(aOut);
for (VideoSegment::ConstChunkIterator c(*in); !c.IsEnded(); c.Next()) {
MOZ_ASSERT(!c->mTimeStamp.IsNull());
VideoChunk* last = out->GetLastChunk();
if (!last || last->mTimeStamp.IsNull()) {
// This is the first frame, or the last frame pushed to `out` has been
// all consumed. Just append and we deal with its duration later.
out->AppendFrame(do_AddRef(c->mFrame.GetImage()),
c->mFrame.GetIntrinsicSize(),
c->mFrame.GetPrincipalHandle(),
c->mFrame.GetForceBlack(), c->mTimeStamp);
if (c->GetDuration() > 0) {
out->ExtendLastFrameBy(c->GetDuration());
}
continue;
}
// We now know when this frame starts, aka when the last frame ends.
if (c->mTimeStamp < last->mTimeStamp) {
// Time is going backwards. This is a resetting frame from
// DecodedStream. Clear everything up to currentTime.
out->Clear();
out->AppendNullData(aCurrentTime);
}
// Append the current frame (will have duration 0).
out->AppendFrame(do_AddRef(c->mFrame.GetImage()),
c->mFrame.GetIntrinsicSize(),
c->mFrame.GetPrincipalHandle(),
c->mFrame.GetForceBlack(), c->mTimeStamp);
if (c->GetDuration() > 0) {
out->ExtendLastFrameBy(c->GetDuration());
}
}
if (out->GetDuration() < aDesiredUpToTime) {
out->ExtendLastFrameBy(aDesiredUpToTime - out->GetDuration());
}
in->Clear();
MOZ_ASSERT(aIn->GetDuration() == 0, "aIn must be consumed");
}
}
void SourceMediaTrack::ExtractPendingInput(GraphTime aCurrentTime,
GraphTime aDesiredUpToTime) {
MutexAutoLock lock(mMutex);
if (!mUpdateTrack) {
MOZ_ASSERT(mEnded);
return;
}
TrackTime trackCurrentTime = GraphTimeToTrackTime(aCurrentTime);
ApplyTrackDisabling(mUpdateTrack->mData.get());
if (!mUpdateTrack->mData->IsEmpty()) {
for (const auto& l : mTrackListeners) {
l->NotifyQueuedChanges(GraphImpl(), GetEnd(), *mUpdateTrack->mData);
}
}
TrackTime trackDesiredUpToTime = GraphTimeToTrackTime(aDesiredUpToTime);
TrackTime endTime = trackDesiredUpToTime;
if (mUpdateTrack->mEnded) {
endTime = std::min(trackDesiredUpToTime,
GetEnd() + mUpdateTrack->mData->GetDuration());
}
LOG(LogLevel::Verbose,
("%p: SourceMediaTrack %p advancing end from %" PRId64 " to %" PRId64,
GraphImpl(), this, int64_t(trackCurrentTime), int64_t(endTime)));
MoveToSegment(this, mUpdateTrack->mData.get(), mSegment.get(),
trackCurrentTime, endTime);
if (mUpdateTrack->mEnded && GetEnd() < trackDesiredUpToTime) {
mEnded = true;
mUpdateTrack = nullptr;
}
}
void SourceMediaTrack::ResampleAudioToGraphSampleRate(MediaSegment* aSegment) {
mMutex.AssertCurrentThreadOwns();
if (aSegment->GetType() != MediaSegment::AUDIO ||
mUpdateTrack->mInputRate == GraphImpl()->GraphRate()) {
return;
}
AudioSegment* segment = static_cast<AudioSegment*>(aSegment);
segment->ResampleChunks(mUpdateTrack->mResampler,
&mUpdateTrack->mResamplerChannelCount,
mUpdateTrack->mInputRate, GraphImpl()->GraphRate());
}
void SourceMediaTrack::AdvanceTimeVaryingValuesToCurrentTime(
GraphTime aCurrentTime, GraphTime aBlockedTime) {
MutexAutoLock lock(mMutex);
MediaTrack::AdvanceTimeVaryingValuesToCurrentTime(aCurrentTime, aBlockedTime);
}
void SourceMediaTrack::SetAppendDataSourceRate(TrackRate aRate) {
MutexAutoLock lock(mMutex);
if (!mUpdateTrack) {
return;
}
MOZ_DIAGNOSTIC_ASSERT(mSegment->GetType() == MediaSegment::AUDIO);
// Set the new input rate and reset the resampler.
mUpdateTrack->mInputRate = aRate;
mUpdateTrack->mResampler.own(nullptr);
mUpdateTrack->mResamplerChannelCount = 0;
}
TrackTime SourceMediaTrack::AppendData(MediaSegment* aSegment,
MediaSegment* aRawSegment) {
MutexAutoLock lock(mMutex);
MOZ_DIAGNOSTIC_ASSERT(aSegment->GetType() == mType);
TrackTime appended = 0;
auto graph = GraphImpl();
if (!mUpdateTrack || mUpdateTrack->mEnded || !graph) {
aSegment->Clear();
return appended;
}
// Data goes into mData, and on the next iteration of the MTG moves
// into the track's segment after NotifyQueuedTrackChanges(). This adds
// 0-10ms of delay before data gets to direct listeners.
// Indirect listeners (via subsequent TrackUnion nodes) are synced to
// playout time, and so can be delayed by buffering.
// Apply track disabling before notifying any consumers directly
// or inserting into the graph
ApplyTrackDisabling(aSegment, aRawSegment);
ResampleAudioToGraphSampleRate(aSegment);
// Must notify first, since AppendFrom() will empty out aSegment
NotifyDirectConsumers(aRawSegment ? aRawSegment : aSegment);
appended = aSegment->GetDuration();
mUpdateTrack->mData->AppendFrom(aSegment); // note: aSegment is now dead
{
MonitorAutoLock lock(graph->GetMonitor());
graph->EnsureNextIteration();
}
return appended;
}
TrackTime SourceMediaTrack::ClearFutureData() {
MutexAutoLock lock(mMutex);
auto graph = GraphImpl();
if (!mUpdateTrack || !graph) {
return 0;
}
TrackTime duration = mUpdateTrack->mData->GetDuration();
mUpdateTrack->mData->Clear();
return duration;
}
void SourceMediaTrack::NotifyDirectConsumers(MediaSegment* aSegment) {
mMutex.AssertCurrentThreadOwns();
for (const auto& l : mDirectTrackListeners) {
TrackTime offset = 0; // FIX! need a separate TrackTime.... or the end of
// the internal buffer
l->NotifyRealtimeTrackDataAndApplyTrackDisabling(Graph(), offset,
*aSegment);
}
}
void SourceMediaTrack::AddDirectListenerImpl(
already_AddRefed<DirectMediaTrackListener> aListener) {
MutexAutoLock lock(mMutex);
RefPtr<DirectMediaTrackListener> listener = aListener;
LOG(LogLevel::Debug,
("%p: Adding direct track listener %p to source track %p", GraphImpl(),
listener.get(), this));
MOZ_ASSERT(mType == MediaSegment::VIDEO);
for (const auto& l : mDirectTrackListeners) {
if (l == listener) {
listener->NotifyDirectListenerInstalled(
DirectMediaTrackListener::InstallationResult::ALREADY_EXISTS);
return;
}
}
mDirectTrackListeners.AppendElement(listener);
LOG(LogLevel::Debug,
("%p: Added direct track listener %p", GraphImpl(), listener.get()));
listener->NotifyDirectListenerInstalled(
DirectMediaTrackListener::InstallationResult::SUCCESS);
if (mEnded) {
return;
}
// Pass buffered data to the listener
VideoSegment bufferedData;
size_t videoFrames = 0;
VideoSegment& segment = *GetData<VideoSegment>();
for (VideoSegment::ConstChunkIterator iter(segment); !iter.IsEnded();
iter.Next()) {
if (iter->mTimeStamp.IsNull()) {
// No timestamp means this is only for the graph's internal book-keeping,
// denoting a late start of the track.
continue;
}
++videoFrames;
bufferedData.AppendFrame(do_AddRef(iter->mFrame.GetImage()),
iter->mFrame.GetIntrinsicSize(),
iter->mFrame.GetPrincipalHandle(),
iter->mFrame.GetForceBlack(), iter->mTimeStamp);
}
VideoSegment& video = static_cast<VideoSegment&>(*mUpdateTrack->mData);
for (VideoSegment::ConstChunkIterator iter(video); !iter.IsEnded();
iter.Next()) {
++videoFrames;
MOZ_ASSERT(!iter->mTimeStamp.IsNull());
bufferedData.AppendFrame(do_AddRef(iter->mFrame.GetImage()),
iter->mFrame.GetIntrinsicSize(),
iter->mFrame.GetPrincipalHandle(),
iter->mFrame.GetForceBlack(), iter->mTimeStamp);
}
LOG(LogLevel::Info,
("%p: Notifying direct listener %p of %zu video frames and duration "
"%" PRId64,
GraphImpl(), listener.get(), videoFrames, bufferedData.GetDuration()));
listener->NotifyRealtimeTrackData(Graph(), 0, bufferedData);
}
void SourceMediaTrack::RemoveDirectListenerImpl(
DirectMediaTrackListener* aListener) {
MutexAutoLock lock(mMutex);
for (int32_t i = mDirectTrackListeners.Length() - 1; i >= 0; --i) {
const RefPtr<DirectMediaTrackListener>& l = mDirectTrackListeners[i];
if (l == aListener) {
aListener->NotifyDirectListenerUninstalled();
mDirectTrackListeners.RemoveElementAt(i);
}
}
}
void SourceMediaTrack::End() {
MutexAutoLock lock(mMutex);
if (!mUpdateTrack) {
// Already ended
return;
}
mUpdateTrack->mEnded = true;
if (auto graph = GraphImpl()) {
MonitorAutoLock lock(graph->GetMonitor());
graph->EnsureNextIteration();
}
}
void SourceMediaTrack::SetEnabledImpl(DisabledTrackMode aMode) {
{
MutexAutoLock lock(mMutex);
for (const auto& l : mDirectTrackListeners) {
DisabledTrackMode oldMode = mDisabledMode;
bool oldEnabled = oldMode == DisabledTrackMode::ENABLED;
if (!oldEnabled && aMode == DisabledTrackMode::ENABLED) {
LOG(LogLevel::Debug, ("%p: SourceMediaTrack %p setting "
"direct listener enabled",
GraphImpl(), this));
l->DecreaseDisabled(oldMode);
} else if (oldEnabled && aMode != DisabledTrackMode::ENABLED) {
LOG(LogLevel::Debug, ("%p: SourceMediaTrack %p setting "
"direct listener disabled",
GraphImpl(), this));
l->IncreaseDisabled(aMode);
}
}
}
MediaTrack::SetEnabledImpl(aMode);
}
void SourceMediaTrack::RemoveAllDirectListenersImpl() {
GraphImpl()->AssertOnGraphThreadOrNotRunning();
MutexAutoLock lock(mMutex);
auto directListeners(mDirectTrackListeners);
for (auto& l : directListeners) {
l->NotifyDirectListenerUninstalled();
}
mDirectTrackListeners.Clear();
}
void SourceMediaTrack::SetVolume(float aVolume) {
MutexAutoLock lock(mMutex);
mVolume = aVolume;
}
float SourceMediaTrack::GetVolumeLocked() {
mMutex.AssertCurrentThreadOwns();
return mVolume;
}
SourceMediaTrack::~SourceMediaTrack() {}
void MediaInputPort::Init() {
LOG(LogLevel::Debug, ("%p: Adding MediaInputPort %p (from %p to %p)",
mSource->GraphImpl(), this, mSource, mDest));
// Only connect the port if it wasn't disconnected on allocation.
if (mSource) {
mSource->AddConsumer(this);
mDest->AddInput(this);
}
// mPortCount decremented via MediaInputPort::Destroy's message
++mGraph->mPortCount;
}
void MediaInputPort::Disconnect() {
GraphImpl()->AssertOnGraphThreadOrNotRunning();
NS_ASSERTION(!mSource == !mDest,
"mSource must either both be null or both non-null");
if (!mSource) return;
mSource->RemoveConsumer(this);
mDest->RemoveInput(this);
mSource = nullptr;
mDest = nullptr;
GraphImpl()->SetTrackOrderDirty();
}
MediaInputPort::InputInterval MediaInputPort::GetNextInputInterval(
MediaInputPort const* aPort, GraphTime aTime) {
InputInterval result = {GRAPH_TIME_MAX, GRAPH_TIME_MAX, false};
if (!aPort) {
result.mStart = aTime;
result.mInputIsBlocked = true;
return result;
}
if (aTime >= aPort->mDest->mStartBlocking) {
return result;
}
result.mStart = aTime;
result.mEnd = aPort->mDest->mStartBlocking;
result.mInputIsBlocked = aTime >= aPort->mSource->mStartBlocking;
if (!result.mInputIsBlocked) {
result.mEnd = std::min(result.mEnd, aPort->mSource->mStartBlocking);
}
return result;
}
void MediaInputPort::Suspended() { mDest->InputSuspended(this); }
void MediaInputPort::Resumed() { mDest->InputResumed(this); }
void MediaInputPort::Destroy() {
class Message : public ControlMessage {
public:
explicit Message(MediaInputPort* aPort)
: ControlMessage(nullptr), mPort(aPort) {}
void Run() override {
mPort->Disconnect();
--mPort->GraphImpl()->mPortCount;
mPort->SetGraphImpl(nullptr);
NS_RELEASE(mPort);
}
void RunDuringShutdown() override { Run(); }
MediaInputPort* mPort;
};
// Keep a reference to the graph, since Message might RunDuringShutdown()
// synchronously and make GraphImpl() invalid.
RefPtr<MediaTrackGraphImpl> graph = GraphImpl();
graph->AppendMessage(MakeUnique<Message>(this));
--graph->mMainThreadPortCount;
}
MediaTrackGraphImpl* MediaInputPort::GraphImpl() { return mGraph; }
MediaTrackGraph* MediaInputPort::Graph() { return mGraph; }
void MediaInputPort::SetGraphImpl(MediaTrackGraphImpl* aGraph) {
MOZ_ASSERT(!mGraph || !aGraph, "Should only be set once");
mGraph = aGraph;
}
already_AddRefed<MediaInputPort> ProcessedMediaTrack::AllocateInputPort(
MediaTrack* aTrack, uint16_t aInputNumber, uint16_t aOutputNumber) {
// This method creates two references to the MediaInputPort: one for
// the main thread, and one for the MediaTrackGraph.
class Message : public ControlMessage {
public:
explicit Message(MediaInputPort* aPort)
: ControlMessage(aPort->GetDestination()), mPort(aPort) {}
void Run() override {
mPort->Init();
// The graph holds its reference implicitly
mPort->GraphImpl()->SetTrackOrderDirty();
Unused << mPort.forget();
}
void RunDuringShutdown() override { Run(); }
RefPtr<MediaInputPort> mPort;
};
MOZ_DIAGNOSTIC_ASSERT(aTrack->mType == mType);
RefPtr<MediaInputPort> port;
if (aTrack->IsDestroyed()) {
// Create a port that's disconnected, which is what it'd be after its source
// track is Destroy()ed normally. Disconnect() is idempotent so destroying
// this later is fine.
port = new MediaInputPort(nullptr, nullptr, aInputNumber, aOutputNumber);
} else {
MOZ_ASSERT(aTrack->GraphImpl() == GraphImpl());
port = new MediaInputPort(aTrack, this, aInputNumber, aOutputNumber);
}
port->SetGraphImpl(GraphImpl());
++GraphImpl()->mMainThreadPortCount;
GraphImpl()->AppendMessage(MakeUnique<Message>(port));
return port.forget();
}
void ProcessedMediaTrack::QueueSetAutoend(bool aAutoend) {
class Message : public ControlMessage {
public:
Message(ProcessedMediaTrack* aTrack, bool aAutoend)
: ControlMessage(aTrack), mAutoend(aAutoend) {}
void Run() override {
static_cast<ProcessedMediaTrack*>(mTrack)->SetAutoendImpl(mAutoend);
}
bool mAutoend;
};
GraphImpl()->AppendMessage(MakeUnique<Message>(this, aAutoend));
}
void ProcessedMediaTrack::DestroyImpl() {
for (int32_t i = mInputs.Length() - 1; i >= 0; --i) {
mInputs[i]->Disconnect();
}
for (int32_t i = mSuspendedInputs.Length() - 1; i >= 0; --i) {
mSuspendedInputs[i]->Disconnect();
}
MediaTrack::DestroyImpl();
// The track order is only important if there are connections, in which
// case MediaInputPort::Disconnect() called SetTrackOrderDirty().
// MediaTrackGraphImpl::RemoveTrackGraphThread() will also call
// SetTrackOrderDirty(), for other reasons.
}
MediaTrackGraphImpl::MediaTrackGraphImpl(GraphDriverType aDriverRequested,
GraphRunType aRunTypeRequested,
TrackRate aSampleRate,
uint32_t aChannelCount,
AbstractThread* aMainThread)
: MediaTrackGraph(aSampleRate),
mGraphRunner(aRunTypeRequested == SINGLE_THREAD
? GraphRunner::Create(this)
: already_AddRefed<GraphRunner>(nullptr)),
mFirstCycleBreaker(0)
// An offline graph is not initially processing.
,
mEndTime(aDriverRequested == OFFLINE_THREAD_DRIVER ? 0 : GRAPH_TIME_MAX),
mPortCount(0),
mInputDeviceID(nullptr),
mOutputDeviceID(nullptr),
mMonitor("MediaTrackGraphImpl"),
mLifecycleState(LIFECYCLE_THREAD_NOT_STARTED),
mForceShutDown(false),
mPostedRunInStableStateEvent(false),
mGraphDriverRunning(false),
mPostedRunInStableState(false),
mRealtime(aDriverRequested != OFFLINE_THREAD_DRIVER),
mTrackOrderDirty(false),
mAbstractMainThread(aMainThread),
mSelfRef(this),
mGlobalVolume(CubebUtils::GetVolumeScale())
#ifdef DEBUG
,
mCanRunMessagesSynchronously(false)
#endif
,
mMainThreadGraphTime(0, "MediaTrackGraphImpl::mMainThreadGraphTime"),
mAudioOutputLatency(0.0) {
if (aRunTypeRequested == SINGLE_THREAD && !mGraphRunner) {
// Failed to create thread. Jump to the last phase of the lifecycle.
mLifecycleState = LIFECYCLE_WAITING_FOR_TRACK_DESTRUCTION;
#ifdef DEBUG
mCanRunMessagesSynchronously = true;
#endif
return;
}
if (mRealtime) {
if (aDriverRequested == AUDIO_THREAD_DRIVER) {
// Always start with zero input channels, and no particular preferences
// for the input channel.
mDriver = new AudioCallbackDriver(
this, nullptr, mSampleRate, aChannelCount, 0, mOutputDeviceID,
mInputDeviceID, AudioInputType::Unknown);
} else {
mDriver = new SystemClockDriver(this, nullptr, mSampleRate);
}
} else {
mDriver =
new OfflineClockDriver(this, mSampleRate, MEDIA_GRAPH_TARGET_PERIOD_MS);
}
mLastMainThreadUpdate = TimeStamp::Now();
StartAudioCallbackTracing();
RegisterWeakAsyncMemoryReporter(this);
if (!IsNonRealtime()) {
AddShutdownBlocker();
}
}
AbstractThread* MediaTrackGraph::AbstractMainThread() {
MOZ_ASSERT(static_cast<MediaTrackGraphImpl*>(this)->mAbstractMainThread);
return static_cast<MediaTrackGraphImpl*>(this)->mAbstractMainThread;
}
#ifdef DEBUG
bool MediaTrackGraphImpl::InDriverIteration(GraphDriver* aDriver) {
return aDriver->OnThread() ||
(mGraphRunner && mGraphRunner->InDriverIteration(aDriver));
}
#endif
void MediaTrackGraphImpl::Destroy() {
// First unregister from memory reporting.
UnregisterWeakMemoryReporter(this);
// Clear the self reference which will destroy this instance if all
// associated GraphDrivers are destroyed.
mSelfRef = nullptr;
}
static uint32_t WindowToHash(nsPIDOMWindowInner* aWindow,
TrackRate aSampleRate) {
uint32_t hashkey = 0;
hashkey = AddToHash(hashkey, aWindow);
hashkey = AddToHash(hashkey, aSampleRate);
return hashkey;
}
MediaTrackGraph* MediaTrackGraph::GetInstanceIfExists(
nsPIDOMWindowInner* aWindow, TrackRate aSampleRate) {
MOZ_ASSERT(NS_IsMainThread(), "Main thread only");
TrackRate sampleRate =
aSampleRate ? aSampleRate : CubebUtils::PreferredSampleRate();
uint32_t hashkey = WindowToHash(aWindow, sampleRate);
MediaTrackGraphImpl* graph = nullptr;
gGraphs.Get(hashkey, &graph);
return graph;
}
MediaTrackGraph* MediaTrackGraph::GetInstance(
MediaTrackGraph::GraphDriverType aGraphDriverRequested,
nsPIDOMWindowInner* aWindow, TrackRate aSampleRate) {
MOZ_ASSERT(NS_IsMainThread(), "Main thread only");
TrackRate sampleRate =
aSampleRate ? aSampleRate : CubebUtils::PreferredSampleRate();
MediaTrackGraphImpl* graph = static_cast<MediaTrackGraphImpl*>(
GetInstanceIfExists(aWindow, sampleRate));
if (!graph) {
AbstractThread* mainThread;
if (aWindow) {
mainThread =
aWindow->AsGlobal()->AbstractMainThreadFor(TaskCategory::Other);
} else {
// Uncommon case, only for some old configuration of webspeech.
mainThread = AbstractThread::MainThread();
}
GraphRunType runType = DIRECT_DRIVER;
if (aGraphDriverRequested != OFFLINE_THREAD_DRIVER &&
(StaticPrefs::dom_audioworklet_enabled() ||
Preferences::GetBool("media.audiograph.single_thread.enabled",
false))) {
runType = SINGLE_THREAD;
}
// In a real time graph, the number of output channels is determined by
// the underlying number of channel of the default audio output device, and
// capped to 8.
uint32_t channelCount =
std::min<uint32_t>(8, CubebUtils::MaxNumberOfChannels());
graph = new MediaTrackGraphImpl(aGraphDriverRequested, runType, sampleRate,
channelCount, mainThread);
uint32_t hashkey = WindowToHash(aWindow, sampleRate);
gGraphs.Put(hashkey, graph);
LOG(LogLevel::Debug,
("Starting up MediaTrackGraph %p for window %p", graph, aWindow));
}
return graph;
}
MediaTrackGraph* MediaTrackGraph::CreateNonRealtimeInstance(
TrackRate aSampleRate, nsPIDOMWindowInner* aWindow) {
MOZ_ASSERT(NS_IsMainThread(), "Main thread only");
AbstractThread* mainThread = AbstractThread::MainThread();
// aWindow can be null when the document is being unlinked, so this works when
// with a generic main thread if that's the case.
if (aWindow) {
mainThread =
aWindow->AsGlobal()->AbstractMainThreadFor(TaskCategory::Other);
}
// Offline graphs have 0 output channel count: they write the output to a
// buffer, not an audio output track.
MediaTrackGraphImpl* graph = new MediaTrackGraphImpl(
OFFLINE_THREAD_DRIVER, DIRECT_DRIVER, aSampleRate, 0, mainThread);
LOG(LogLevel::Debug, ("Starting up Offline MediaTrackGraph %p", graph));
return graph;
}
void MediaTrackGraph::DestroyNonRealtimeInstance(MediaTrackGraph* aGraph) {
MOZ_ASSERT(NS_IsMainThread(), "Main thread only");
MOZ_ASSERT(aGraph->IsNonRealtime(),
"Should not destroy the global graph here");
MediaTrackGraphImpl* graph = static_cast<MediaTrackGraphImpl*>(aGraph);
graph->ForceShutDown();
}
NS_IMPL_ISUPPORTS(MediaTrackGraphImpl, nsIMemoryReporter, nsITimerCallback,
nsINamed)
NS_IMETHODIMP
MediaTrackGraphImpl::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) {
MOZ_ASSERT(NS_IsMainThread());
if (mMainThreadTrackCount == 0) {
// No tracks to report.
FinishCollectReports(aHandleReport, aData, nsTArray<AudioNodeSizes>());
return NS_OK;
}
class Message final : public ControlMessage {
public:
Message(MediaTrackGraphImpl* aGraph, nsIHandleReportCallback* aHandleReport,
nsISupports* aHandlerData)
: ControlMessage(nullptr),
mGraph(aGraph),
mHandleReport(aHandleReport),
mHandlerData(aHandlerData) {}
void Run() override {
mGraph->CollectSizesForMemoryReport(mHandleReport.forget(),
mHandlerData.forget());
}
void RunDuringShutdown() override {
// Run this message during shutdown too, so that endReports is called.
Run();
}
MediaTrackGraphImpl* mGraph;
// nsMemoryReporterManager keeps the callback and data alive only if it
// does not time out.
nsCOMPtr<nsIHandleReportCallback> mHandleReport;
nsCOMPtr<nsISupports> mHandlerData;
};
AppendMessage(MakeUnique<Message>(this, aHandleReport, aData));
return NS_OK;
}
void MediaTrackGraphImpl::CollectSizesForMemoryReport(
already_AddRefed<nsIHandleReportCallback> aHandleReport,
already_AddRefed<nsISupports> aHandlerData) {
class FinishCollectRunnable final : public Runnable {
public:
explicit FinishCollectRunnable(
already_AddRefed<nsIHandleReportCallback> aHandleReport,
already_AddRefed<nsISupports> aHandlerData)
: mozilla::Runnable("FinishCollectRunnable"),
mHandleReport(aHandleReport),
mHandlerData(aHandlerData) {}
NS_IMETHOD Run() override {
MediaTrackGraphImpl::FinishCollectReports(mHandleReport, mHandlerData,
std::move(mAudioTrackSizes));
return NS_OK;
}
nsTArray<AudioNodeSizes> mAudioTrackSizes;
private:
~FinishCollectRunnable() {}
// Avoiding nsCOMPtr because NSCAP_ASSERT_NO_QUERY_NEEDED in its
// constructor modifies the ref-count, which cannot be done off main
// thread.
RefPtr<nsIHandleReportCallback> mHandleReport;
RefPtr<nsISupports> mHandlerData;
};
RefPtr<FinishCollectRunnable> runnable = new FinishCollectRunnable(
std::move(aHandleReport), std::move(aHandlerData));
auto audioTrackSizes = &runnable->mAudioTrackSizes;
for (MediaTrack* t : AllTracks()) {
AudioNodeTrack* track = t->AsAudioNodeTrack();
if (track) {
AudioNodeSizes* usage = audioTrackSizes->AppendElement();
track->SizeOfAudioNodesIncludingThis(MallocSizeOf, *usage);
}
}
mAbstractMainThread->Dispatch(runnable.forget());
}
void MediaTrackGraphImpl::FinishCollectReports(
nsIHandleReportCallback* aHandleReport, nsISupports* aData,
const nsTArray<AudioNodeSizes>& aAudioTrackSizes) {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIMemoryReporterManager> manager =
do_GetService("@mozilla.org/memory-reporter-manager;1");
if (!manager) return;
#define REPORT(_path, _amount, _desc) \
aHandleReport->Callback(EmptyCString(), _path, KIND_HEAP, UNITS_BYTES, \
_amount, NS_LITERAL_CSTRING(_desc), aData);
for (size_t i = 0; i < aAudioTrackSizes.Length(); i++) {
const AudioNodeSizes& usage = aAudioTrackSizes[i];
const char* const nodeType =
usage.mNodeType ? usage.mNodeType : "<unknown>";
nsPrintfCString enginePath("explicit/webaudio/audio-node/%s/engine-objects",
nodeType);
REPORT(enginePath, usage.mEngine,
"Memory used by AudioNode engine objects (Web Audio).");
nsPrintfCString trackPath("explicit/webaudio/audio-node/%s/track-objects",
nodeType);
REPORT(trackPath, usage.mTrack,
"Memory used by AudioNode track objects (Web Audio).");
}
size_t hrtfLoaders = WebCore::HRTFDatabaseLoader::sizeOfLoaders(MallocSizeOf);
if (hrtfLoaders) {
REPORT(NS_LITERAL_CSTRING(
"explicit/webaudio/audio-node/PannerNode/hrtf-databases"),
hrtfLoaders, "Memory used by PannerNode databases (Web Audio).");
}
#undef REPORT
manager->EndReport();
}
SourceMediaTrack* MediaTrackGraph::CreateSourceTrack(MediaSegment::Type aType) {
SourceMediaTrack* track = new SourceMediaTrack(aType, GraphRate());
AddTrack(track);
return track;
}
ProcessedMediaTrack* MediaTrackGraph::CreateForwardedInputTrack(
MediaSegment::Type aType) {
ForwardedInputTrack* track = new ForwardedInputTrack(GraphRate(), aType);
AddTrack(track);
return track;
}
AudioCaptureTrack* MediaTrackGraph::CreateAudioCaptureTrack() {
AudioCaptureTrack* track = new AudioCaptureTrack(GraphRate());
AddTrack(track);
return track;
}
void MediaTrackGraph::AddTrack(MediaTrack* aTrack) {
MediaTrackGraphImpl* graph = static_cast<MediaTrackGraphImpl*>(this);
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
if (graph->mRealtime) {
bool found = false;
for (auto iter = gGraphs.ConstIter(); !iter.Done(); iter.Next()) {
if (iter.UserData() == graph) {
found = true;
break;
}
}
MOZ_DIAGNOSTIC_ASSERT(found, "Graph must not be shutting down");
}
#endif
NS_ADDREF(aTrack);
aTrack->SetGraphImpl(graph);
++graph->mMainThreadTrackCount;
graph->AppendMessage(MakeUnique<CreateMessage>(aTrack));
}
void MediaTrackGraphImpl::RemoveTrack(MediaTrack* aTrack) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(mMainThreadTrackCount > 0);
if (--mMainThreadTrackCount == 0) {
LOG(LogLevel::Info, ("MediaTrackGraph %p, last track %p removed from "
"main thread. Graph will shut down.",
this, aTrack));
// Find the graph in the hash table and remove it.
for (auto iter = gGraphs.Iter(); !iter.Done(); iter.Next()) {
if (iter.UserData() == this) {
iter.Remove();
break;
}
}
}
}
auto MediaTrackGraph::NotifyWhenGraphStarted(AudioNodeTrack* aTrack)
-> RefPtr<GraphStartedPromise> {
MOZ_ASSERT(NS_IsMainThread());
MozPromiseHolder<GraphStartedPromise> h;
RefPtr<GraphStartedPromise> p = h.Ensure(__func__);
aTrack->GraphImpl()->NotifyWhenGraphStarted(aTrack, std::move(h));
return p;
}
void MediaTrackGraphImpl::NotifyWhenGraphStarted(
RefPtr<AudioNodeTrack> aTrack,
MozPromiseHolder<GraphStartedPromise>&& aHolder) {
class GraphStartedNotificationControlMessage : public ControlMessage {
RefPtr<AudioNodeTrack> mAudioNodeTrack;
MozPromiseHolder<GraphStartedPromise> mHolder;
public:
GraphStartedNotificationControlMessage(
RefPtr<AudioNodeTrack> aTrack,
MozPromiseHolder<GraphStartedPromise>&& aHolder)
: ControlMessage(nullptr),
mAudioNodeTrack(std::move(aTrack)),
mHolder(std::move(aHolder)) {}
void Run() override {
// This runs on the graph thread, so when this runs, and the current
// driver is an AudioCallbackDriver, we know the audio hardware is
// started. If not, we are going to switch soon, keep reposting this
// ControlMessage.
MediaTrackGraphImpl* graphImpl = mAudioNodeTrack->GraphImpl();
if (graphImpl->CurrentDriver()->AsAudioCallbackDriver()) {
// Avoid Resolve's locking on the graph thread by doing it on main.
graphImpl->Dispatch(NS_NewRunnableFunction(
"MediaTrackGraphImpl::NotifyWhenGraphStarted::Resolver",
[holder = std::move(mHolder)]() mutable {
holder.Resolve(true, __func__);
}));
} else {
graphImpl->DispatchToMainThreadStableState(
NewRunnableMethod<
StoreCopyPassByRRef<RefPtr<AudioNodeTrack>>,
StoreCopyPassByRRef<MozPromiseHolder<GraphStartedPromise>>>(
"MediaTrackGraphImpl::NotifyWhenGraphStarted", graphImpl,
&MediaTrackGraphImpl::NotifyWhenGraphStarted,
std::move(mAudioNodeTrack), std::move(mHolder)));
}
}
void RunDuringShutdown() override {
mHolder.Reject(NS_ERROR_ILLEGAL_DURING_SHUTDOWN, __func__);
}
};
if (aTrack->IsDestroyed()) {
aHolder.Reject(NS_ERROR_NOT_AVAILABLE, __func__);
return;
}
MediaTrackGraphImpl* graph = aTrack->GraphImpl();
graph->AppendMessage(MakeUnique<GraphStartedNotificationControlMessage>(
std::move(aTrack), std::move(aHolder)));
}
void MediaTrackGraphImpl::IncrementSuspendCount(MediaTrack* aTrack) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
bool wasSuspended = aTrack->IsSuspended();
aTrack->IncrementSuspendCount();
if (!wasSuspended && aTrack->IsSuspended()) {
MOZ_ASSERT(mTracks.Contains(aTrack));
mTracks.RemoveElement(aTrack);
mSuspendedTracks.AppendElement(aTrack);
SetTrackOrderDirty();
}
}
void MediaTrackGraphImpl::DecrementSuspendCount(MediaTrack* aTrack) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
bool wasSuspended = aTrack->IsSuspended();
aTrack->DecrementSuspendCount();
if (wasSuspended && !aTrack->IsSuspended()) {
MOZ_ASSERT(mSuspendedTracks.Contains(aTrack));
mSuspendedTracks.RemoveElement(aTrack);
mTracks.AppendElement(aTrack);
ProcessedMediaTrack* pt = aTrack->AsProcessedTrack();
if (pt) {
pt->mCycleMarker = NOT_VISITED;
}
SetTrackOrderDirty();
}
}
void MediaTrackGraphImpl::SuspendOrResumeTracks(
AudioContextOperation aAudioContextOperation,
const nsTArray<MediaTrack*>& aTrackSet) {
MOZ_ASSERT(OnGraphThreadOrNotRunning());
// For our purpose, Suspend and Close are equivalent: we want to remove the
// tracks from the set of tracks that are going to be processed.
for (MediaTrack* track : aTrackSet) {
if (aAudioContextOperation == AudioContextOperation::Resume) {
DecrementSuspendCount(track);
} else {
IncrementSuspendCount(track);
}
}
LOG(LogLevel::Debug, ("Moving tracks between suspended and running"
"state: mTracks: %zu, mSuspendedTracks: %zu",
mTracks.Length(), mSuspendedTracks.Length()));
#ifdef DEBUG
// The intersection of the two arrays should be null.
for (uint32_t i = 0; i < mTracks.Length(); i++) {
for (uint32_t j = 0; j < mSuspendedTracks.Length(); j++) {
MOZ_ASSERT(
mTracks[i] != mSuspendedTracks[j],
"The suspended track set and running track set are not disjoint.");
}
}
#endif
}
void MediaTrackGraphImpl::ApplyAudioContextOperationImpl(
MediaTrack* aDestinationTrack, const nsTArray<MediaTrack*>& aTracks,
AudioContextOperation aOperation,
MozPromiseHolder<AudioContextOperationPromise>&& aHolder) {
MOZ_ASSERT(OnGraphThread());
SuspendOrResumeTracks(aOperation, aTracks);
if (aOperation == AudioContextOperation::Resume) {
// If we have suspended the last AudioContext, and we don't have other
// tracks that have audio, this graph will automatically switch to a
// SystemCallbackDriver, because it can't find a MediaTrack that has an
// audio track. When resuming, force switching to an AudioCallbackDriver (if
// we're not already switching). It would have happened at the next
// iteration anyways, but doing this now save some time.
if (!CurrentDriver()->AsAudioCallbackDriver()) {
AudioCallbackDriver* driver;
if (Switching()) {
MOZ_ASSERT(NextDriver()->AsAudioCallbackDriver());
driver = NextDriver()->AsAudioCallbackDriver();
} else {
driver = new AudioCallbackDriver(
this, CurrentDriver(), mSampleRate, AudioOutputChannelCount(),
AudioInputChannelCount(), mOutputDeviceID, mInputDeviceID,
AudioInputDevicePreference());
SwitchAtNextIteration(driver);
}
driver->EnqueueTrackAndPromiseForOperation(aDestinationTrack, aOperation,
mAbstractMainThread,
std::move(aHolder));
} else {
// We are resuming a context, but we are already using an
// AudioCallbackDriver, we can resolve the promise now. We do this on main
// thread to avoid locking the holder's mutex on the graph thread.
DispatchToMainThreadStableState(NS_NewRunnableFunction(
"MediaTrackGraphImpl::ApplyAudioContextOperationImpl::Resolve1",
[holder = std::move(aHolder)]() mutable {
holder.Resolve(AudioContextState::Running, __func__);
}));
}
} else {
// Close, suspend: check if we are going to switch to a
// SystemAudioCallbackDriver, and pass the promise to the
// AudioCallbackDriver if that's the case, so it can notify the content.
// This is the same logic as in UpdateTrackOrder, but it's simpler to have
// it here as well so we don't have to store the Promise(s) on the Graph.
AudioContextState state;
switch (aOperation) {
case AudioContextOperation::Suspend:
state = AudioContextState::Suspended;
break;
case AudioContextOperation::Close:
state = AudioContextState::Closed;
break;
default:
MOZ_CRASH("Unexpected operation");
}
bool audioTrackPresent = AudioTrackPresent();
if (!audioTrackPresent && CurrentDriver()->AsAudioCallbackDriver()) {
CurrentDriver()
->AsAudioCallbackDriver()
->EnqueueTrackAndPromiseForOperation(aDestinationTrack, aOperation,
mAbstractMainThread,
std::move(aHolder));
SystemClockDriver* driver;
if (!Switching()) {
driver = new SystemClockDriver(this, CurrentDriver(), mSampleRate);
SwitchAtNextIteration(driver);
}
// We are closing or suspending an AudioContext, but we just got resumed.
// Queue the operation on the next driver so that the ordering is
// preserved.
} else if (!audioTrackPresent && Switching()) {
MOZ_ASSERT(NextDriver()->AsAudioCallbackDriver());
if (NextDriver()->AsAudioCallbackDriver()) {
NextDriver()
->AsAudioCallbackDriver()
->EnqueueTrackAndPromiseForOperation(aDestinationTrack, aOperation,
mAbstractMainThread,
std::move(aHolder));
} else {
// If this is not an AudioCallbackDriver, this means we failed opening
// an AudioCallbackDriver in the past, and we're constantly trying to
// re-open an new audio track, but are running this graph that has an
// audio track off a SystemClockDriver for now to keep things moving.
// This is the case where we're trying to switch an an system driver
// (because suspend or close have been called on an AudioContext, or
// we've closed the page), but we're already running one. We can just
// resolve the promise now: we're already running off a system thread.
// We do this on main
// thread to avoid locking the holder's mutex on the graph thread.
DispatchToMainThreadStableState(NS_NewRunnableFunction(
"MediaTrackGraphImpl::ApplyAudioContextOperationImpl::Resolve2",
[holder = std::move(aHolder), state]() mutable {
holder.Resolve(state, __func__);
}));
}
} else {
// We are closing or suspending an AudioContext, but something else is
// using the audio track, we can resolve the promise now. We do this on
// main thread to avoid locking the holder's mutex on the graph thread.
DispatchToMainThreadStableState(NS_NewRunnableFunction(
"MediaTrackGraphImpl::ApplyAudioContextOperationImpl::Resolve3",
[holder = std::move(aHolder), state]() mutable {
holder.Resolve(state, __func__);
}));
}
}
}
auto MediaTrackGraph::ApplyAudioContextOperation(
MediaTrack* aDestinationTrack, const nsTArray<MediaTrack*>& aTracks,
AudioContextOperation aOperation) -> RefPtr<AudioContextOperationPromise> {
class AudioContextOperationControlMessage : public ControlMessage {
public:
AudioContextOperationControlMessage(
MediaTrack* aDestinationTrack, const nsTArray<MediaTrack*>& aTracks,
AudioContextOperation aOperation,
MozPromiseHolder<AudioContextOperationPromise>&& aHolder)
: ControlMessage(aDestinationTrack),
mTracks(aTracks),
mAudioContextOperation(aOperation),
mHolder(std::move(aHolder)) {}
void Run() override {
mTrack->GraphImpl()->ApplyAudioContextOperationImpl(
mTrack, mTracks, mAudioContextOperation, std::move(mHolder));
}
void RunDuringShutdown() override {
MOZ_ASSERT(mAudioContextOperation == AudioContextOperation::Close,
"We should be reviving the graph?");
mHolder.Resolve(AudioContextState::Closed, __func__);
}
private:
// We don't need strong references here for the same reason ControlMessage
// doesn't.
nsTArray<MediaTrack*> mTracks;
AudioContextOperation mAudioContextOperation;
MozPromiseHolder<AudioContextOperationPromise> mHolder;
};
MozPromiseHolder<AudioContextOperationPromise> holder;
RefPtr<AudioContextOperationPromise> p = holder.Ensure(__func__);
MediaTrackGraphImpl* graphImpl = static_cast<MediaTrackGraphImpl*>(this);
graphImpl->AppendMessage(MakeUnique<AudioContextOperationControlMessage>(
aDestinationTrack, aTracks, aOperation, std::move(holder)));
return p;
}
uint32_t MediaTrackGraphImpl::AudioOutputChannelCount() const {
MOZ_ASSERT(OnGraphThread());
// The audio output channel count for a graph is the maximum of the output
// channel count of all the tracks that are in mAudioOutputs.
uint32_t channelCount = 0;
for (auto& tkv : mAudioOutputs) {
MediaTrack* t = tkv.mTrack;
// This is an AudioDestinationNode
if (t->AsAudioNodeTrack()) {
channelCount = std::max<uint32_t>(
channelCount, t->AsAudioNodeTrack()->NumberOfChannels());
} else if (t->GetData<AudioSegment>()) {
AudioSegment* segment = t->GetData<AudioSegment>();
channelCount =
std::max<uint32_t>(channelCount, segment->MaxChannelCount());
}
}
if (channelCount) {
return channelCount;
} else {
if (CurrentDriver()->AsAudioCallbackDriver()) {
return CurrentDriver()->AsAudioCallbackDriver()->OutputChannelCount();
}
return 2;
}
}
double MediaTrackGraph::AudioOutputLatency() {
return static_cast<MediaTrackGraphImpl*>(this)->AudioOutputLatency();
}
double MediaTrackGraphImpl::AudioOutputLatency() {
MOZ_ASSERT(NS_IsMainThread());
if (mAudioOutputLatency != 0.0) {
return mAudioOutputLatency;
}
MonitorAutoLock lock(mMonitor);
if (CurrentDriver()->AsAudioCallbackDriver()) {
mAudioOutputLatency = CurrentDriver()
->AsAudioCallbackDriver()
->AudioOutputLatency()
.ToSeconds();
} else {
// Failure mode: return 0.0 if running on a normal thread.
mAudioOutputLatency = 0.0;
}
return mAudioOutputLatency;
}
bool MediaTrackGraph::IsNonRealtime() const {
return !static_cast<const MediaTrackGraphImpl*>(this)->mRealtime;
}
void MediaTrackGraph::StartNonRealtimeProcessing(uint32_t aTicksToProcess) {
MOZ_ASSERT(NS_IsMainThread(), "main thread only");
MediaTrackGraphImpl* graph = static_cast<MediaTrackGraphImpl*>(this);
NS_ASSERTION(!graph->mRealtime, "non-realtime only");
class Message : public ControlMessage {
public:
explicit Message(MediaTrackGraphImpl* aGraph, uint32_t aTicksToProcess)
: ControlMessage(nullptr),
mGraph(aGraph),
mTicksToProcess(aTicksToProcess) {}
void Run() override {
MOZ_ASSERT(mGraph->mEndTime == 0,
"StartNonRealtimeProcessing should be called only once");
mGraph->mEndTime = mGraph->RoundUpToEndOfAudioBlock(
mGraph->mStateComputedTime + mTicksToProcess);
}
// The graph owns this message.
MediaTrackGraphImpl* MOZ_NON_OWNING_REF mGraph;
uint32_t mTicksToProcess;
};
graph->AppendMessage(MakeUnique<Message>(graph, aTicksToProcess));
}
void ProcessedMediaTrack::AddInput(MediaInputPort* aPort) {
MediaTrack* t = aPort->GetSource();
if (!t->IsSuspended()) {
mInputs.AppendElement(aPort);
} else {
mSuspendedInputs.AppendElement(aPort);
}
GraphImpl()->SetTrackOrderDirty();
}
void ProcessedMediaTrack::InputSuspended(MediaInputPort* aPort) {
GraphImpl()->AssertOnGraphThreadOrNotRunning();
mInputs.RemoveElement(aPort);
mSuspendedInputs.AppendElement(aPort);
GraphImpl()->SetTrackOrderDirty();
}
void ProcessedMediaTrack::InputResumed(MediaInputPort* aPort) {
GraphImpl()->AssertOnGraphThreadOrNotRunning();
mSuspendedInputs.RemoveElement(aPort);
mInputs.AppendElement(aPort);
GraphImpl()->SetTrackOrderDirty();
}
void MediaTrackGraphImpl::SwitchAtNextIteration(GraphDriver* aNextDriver) {
MOZ_ASSERT(OnGraphThread());
LOG(LogLevel::Debug, ("%p: Switching to new driver: %p", this, aNextDriver));
if (GraphDriver* nextDriver = NextDriver()) {
if (nextDriver != CurrentDriver()) {
LOG(LogLevel::Debug,
("%p: Discarding previous next driver: %p", this, nextDriver));
}
}
mNextDriver = aNextDriver;
}
void MediaTrackGraph::RegisterCaptureTrackForWindow(
uint64_t aWindowId, ProcessedMediaTrack* aCaptureTrack) {
MOZ_ASSERT(NS_IsMainThread());
MediaTrackGraphImpl* graphImpl = static_cast<MediaTrackGraphImpl*>(this);
graphImpl->RegisterCaptureTrackForWindow(aWindowId, aCaptureTrack);
}
void MediaTrackGraphImpl::RegisterCaptureTrackForWindow(
uint64_t aWindowId, ProcessedMediaTrack* aCaptureTrack) {
MOZ_ASSERT(NS_IsMainThread());
WindowAndTrack winAndTrack;
winAndTrack.mWindowId = aWindowId;
winAndTrack.mCaptureTrackSink = aCaptureTrack;
mWindowCaptureTracks.AppendElement(winAndTrack);
}
void MediaTrackGraph::UnregisterCaptureTrackForWindow(uint64_t aWindowId) {
MOZ_ASSERT(NS_IsMainThread());
MediaTrackGraphImpl* graphImpl = static_cast<MediaTrackGraphImpl*>(this);
graphImpl->UnregisterCaptureTrackForWindow(aWindowId);
}
void MediaTrackGraphImpl::UnregisterCaptureTrackForWindow(uint64_t aWindowId) {
MOZ_ASSERT(NS_IsMainThread());
for (int32_t i = mWindowCaptureTracks.Length() - 1; i >= 0; i--) {
if (mWindowCaptureTracks[i].mWindowId == aWindowId) {
mWindowCaptureTracks.RemoveElementAt(i);
}
}
}
already_AddRefed<MediaInputPort> MediaTrackGraph::ConnectToCaptureTrack(
uint64_t aWindowId, MediaTrack* aMediaTrack) {
return aMediaTrack->GraphImpl()->ConnectToCaptureTrack(aWindowId,
aMediaTrack);
}
already_AddRefed<MediaInputPort> MediaTrackGraphImpl::ConnectToCaptureTrack(
uint64_t aWindowId, MediaTrack* aMediaTrack) {
MOZ_ASSERT(NS_IsMainThread());
for (uint32_t i = 0; i < mWindowCaptureTracks.Length(); i++) {
if (mWindowCaptureTracks[i].mWindowId == aWindowId) {
ProcessedMediaTrack* sink = mWindowCaptureTracks[i].mCaptureTrackSink;
return sink->AllocateInputPort(aMediaTrack);
}
}
return nullptr;
}
void MediaTrackGraph::DispatchToMainThreadStableState(
already_AddRefed<nsIRunnable> aRunnable) {
AssertOnGraphThreadOrNotRunning();
static_cast<MediaTrackGraphImpl*>(this)
->mPendingUpdateRunnables.AppendElement(std::move(aRunnable));
}
Watchable<mozilla::GraphTime>& MediaTrackGraphImpl::CurrentTime() {
MOZ_ASSERT(NS_IsMainThread());
return mMainThreadGraphTime;
}
GraphTime MediaTrackGraph::ProcessedTime() const {
AssertOnGraphThreadOrNotRunning();
return static_cast<const MediaTrackGraphImpl*>(this)->mProcessedTime;
}
} // namespace mozilla
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