void
AudioCaptureStream::ProcessInput(GraphTime aFrom, GraphTime aTo,
uint32_t aFlags)
{
uint32_t inputCount = mInputs.Length();
StreamBuffer::Track* track = EnsureTrack(mTrackId);
// Notify the DOM everything is in order.
if (!mTrackCreated) {
for (uint32_t i = 0; i < mListeners.Length(); i++) {
MediaStreamListener* l = mListeners[i];
AudioSegment tmp;
l->NotifyQueuedTrackChanges(
Graph(), mTrackId, 0, MediaStreamListener::TRACK_EVENT_CREATED, tmp);
l->NotifyFinishedTrackCreation(Graph());
}
mTrackCreated = true;
}
// If the captured stream is connected back to a object on the page (be it an
// HTMLMediaElement with a stream as source, or an AudioContext), a cycle
// situation occur. This can work if it's an AudioContext with at least one
// DelayNode, but the MSG will mute the whole cycle otherwise.
if (mFinished || InMutedCycle() || inputCount == 0) {
track->Get<AudioSegment>()->AppendNullData(aTo - aFrom);
} else {
// We mix down all the tracks of all inputs, to a stereo track. Everything
// is {up,down}-mixed to stereo.
mMixer.StartMixing();
AudioSegment output;
for (uint32_t i = 0; i < inputCount; i++) {
MediaStream* s = mInputs[i]->GetSource();
StreamBuffer::TrackIter tracks(s->GetStreamBuffer(), MediaSegment::AUDIO);
while (!tracks.IsEnded()) {
AudioSegment* inputSegment = tracks->Get<AudioSegment>();
StreamTime inputStart = s->GraphTimeToStreamTimeWithBlocking(aFrom);
StreamTime inputEnd = s->GraphTimeToStreamTimeWithBlocking(aTo);
AudioSegment toMix;
toMix.AppendSlice(*inputSegment, inputStart, inputEnd);
// Care for streams blocked in the [aTo, aFrom] range.
if (inputEnd - inputStart < aTo - aFrom) {
toMix.AppendNullData((aTo - aFrom) - (inputEnd - inputStart));
}
toMix.Mix(mMixer, MONO, Graph()->GraphRate());
tracks.Next();
}
}
// This calls MixerCallback below
mMixer.FinishMixing();
}
// Regardless of the status of the input tracks, we go foward.
mBuffer.AdvanceKnownTracksTime(GraphTimeToStreamTimeWithBlocking((aTo)));
}
void TrackUnionStream::ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags)
{
if (IsFinishedOnGraphThread()) {
return;
}
nsAutoTArray<bool,8> mappedTracksFinished;
nsAutoTArray<bool,8> mappedTracksWithMatchingInputTracks;
for (uint32_t i = 0; i < mTrackMap.Length(); ++i) {
mappedTracksFinished.AppendElement(true);
mappedTracksWithMatchingInputTracks.AppendElement(false);
}
bool allFinished = !mInputs.IsEmpty();
bool allHaveCurrentData = !mInputs.IsEmpty();
for (uint32_t i = 0; i < mInputs.Length(); ++i) {
MediaStream* stream = mInputs[i]->GetSource();
if (!stream->IsFinishedOnGraphThread()) {
// XXX we really should check whether 'stream' has finished within time aTo,
// not just that it's finishing when all its queued data eventually runs
// out.
allFinished = false;
}
if (!stream->HasCurrentData()) {
allHaveCurrentData = false;
}
bool trackAdded = false;
for (StreamBuffer::TrackIter tracks(stream->GetStreamBuffer());
!tracks.IsEnded(); tracks.Next()) {
bool found = false;
for (uint32_t j = 0; j < mTrackMap.Length(); ++j) {
TrackMapEntry* map = &mTrackMap[j];
if (map->mInputPort == mInputs[i] && map->mInputTrackID == tracks->GetID()) {
bool trackFinished;
StreamBuffer::Track* outputTrack = mBuffer.FindTrack(map->mOutputTrackID);
if (!outputTrack || outputTrack->IsEnded()) {
trackFinished = true;
} else {
CopyTrackData(tracks.get(), j, aFrom, aTo, &trackFinished);
}
mappedTracksFinished[j] = trackFinished;
mappedTracksWithMatchingInputTracks[j] = true;
found = true;
break;
}
}
if (!found && (!mFilterCallback || mFilterCallback(tracks.get()))) {
bool trackFinished = false;
trackAdded = true;
uint32_t mapIndex = AddTrack(mInputs[i], tracks.get(), aFrom);
CopyTrackData(tracks.get(), mapIndex, aFrom, aTo, &trackFinished);
mappedTracksFinished.AppendElement(trackFinished);
mappedTracksWithMatchingInputTracks.AppendElement(true);
}
}
if (trackAdded) {
for (MediaStreamListener* l : mListeners) {
l->NotifyFinishedTrackCreation(Graph());
}
}
}
for (int32_t i = mTrackMap.Length() - 1; i >= 0; --i) {
if (mappedTracksFinished[i]) {
EndTrack(i);
} else {
allFinished = false;
}
if (!mappedTracksWithMatchingInputTracks[i]) {
mTrackMap.RemoveElementAt(i);
}
}
if (allFinished && mAutofinish && (aFlags & ALLOW_FINISH)) {
// All streams have finished and won't add any more tracks, and
// all our tracks have actually finished and been removed from our map,
// so we're finished now.
FinishOnGraphThread();
} else {
mBuffer.AdvanceKnownTracksTime(GraphTimeToStreamTime(aTo));
}
if (allHaveCurrentData) {
// We can make progress if we're not blocked
mHasCurrentData = true;
}
}