gecko-dev/dom/media/TrackUnionStream.h
Andreas Pehrson 867415c0b5 Bug 1170958 - Remove ProcessedMediaStream::ForwardTrackEnabled. r=roc,jesup
TrackUnionStream guarantees that TrackIDs are maintained if no tracks
have claimed them before.

In the gUM case, we have a SourceMediaStream which we wholly own (the
DOMMediaStream's Input stream), piped into a TrackUnionStream which
no-one external is able to add tracks to (the DOMMediaStream's Owned
stream) - addTrack()ed tracks are added to the DOMMediaStream's Playback
stream.

The MediaStreamTracks being enabled/disable refer to a TrackID in the
DOMMediaStream's Owned stream.

Alas, we don't need to forward a track's enabled state, we can just do
it on the source.

--HG--
extra : commitid : GPSNwBVyD4j
extra : rebase_source : 4388211be87ebe8a3839ea031b5c504d642806ab
2015-09-30 09:31:54 +08:00

71 lines
2.8 KiB
C++

/* -*- 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/. */
#ifndef MOZILLA_TRACKUNIONSTREAM_H_
#define MOZILLA_TRACKUNIONSTREAM_H_
#include "MediaStreamGraph.h"
#include <algorithm>
namespace mozilla {
/**
* See MediaStreamGraph::CreateTrackUnionStream.
*/
class TrackUnionStream : public ProcessedMediaStream {
public:
explicit TrackUnionStream(DOMMediaStream* aWrapper);
virtual void RemoveInput(MediaInputPort* aPort) override;
virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) override;
protected:
// Only non-ended tracks are allowed to persist in this map.
struct TrackMapEntry {
// mEndOfConsumedInputTicks is the end of the input ticks that we've consumed.
// 0 if we haven't consumed any yet.
StreamTime mEndOfConsumedInputTicks;
// mEndOfLastInputIntervalInInputStream is the timestamp for the end of the
// previous interval which was unblocked for both the input and output
// stream, in the input stream's timeline, or -1 if there wasn't one.
StreamTime mEndOfLastInputIntervalInInputStream;
// mEndOfLastInputIntervalInOutputStream is the timestamp for the end of the
// previous interval which was unblocked for both the input and output
// stream, in the output stream's timeline, or -1 if there wasn't one.
StreamTime mEndOfLastInputIntervalInOutputStream;
MediaInputPort* mInputPort;
// We keep track IDs instead of track pointers because
// tracks can be removed without us being notified (e.g.
// when a finished track is forgotten.) When we need a Track*,
// we call StreamBuffer::FindTrack, which will return null if
// the track has been deleted.
TrackID mInputTrackID;
TrackID mOutputTrackID;
nsAutoPtr<MediaSegment> mSegment;
};
// Add the track to this stream, retaining its TrackID if it has never
// been previously used in this stream, allocating a new TrackID otherwise.
uint32_t AddTrack(MediaInputPort* aPort, StreamBuffer::Track* aTrack,
GraphTime aFrom);
void EndTrack(uint32_t aIndex);
void CopyTrackData(StreamBuffer::Track* aInputTrack,
uint32_t aMapIndex, GraphTime aFrom, GraphTime aTo,
bool* aOutputTrackFinished);
nsTArray<TrackMapEntry> mTrackMap;
// The next available TrackID, starting at 1 and progressing upwards.
// All TrackIDs in [1, mNextAvailableTrackID) have implicitly been used.
TrackID mNextAvailableTrackID;
// Sorted array of used TrackIDs that require manual tracking.
nsTArray<TrackID> mUsedTracks;
};
} // namespace mozilla
#endif /* MOZILLA_MEDIASTREAMGRAPH_H_ */