gecko-dev/dom/media/TrackUnionStream.h

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2.9 KiB
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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/. */
#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) MOZ_OVERRIDE;
virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) MOZ_OVERRIDE;
// Consumers may specify a filtering callback to apply to every input track.
// Returns true to allow the track to act as an input; false to reject it entirely.
typedef bool (*TrackIDFilterCallback)(StreamBuffer::Track*);
void SetTrackIDFilter(TrackIDFilterCallback aCallback);
// Forward SetTrackEnabled(output_track_id, enabled) to the Source MediaStream,
// translating the output track ID into the correct ID in the source.
virtual void ForwardTrackEnabled(TrackID aOutputID, bool aEnabled) MOZ_OVERRIDE;
protected:
TrackIDFilterCallback mFilterCallback;
// 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;
};
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;
};
}
#endif /* MOZILLA_MEDIASTREAMGRAPH_H_ */