зеркало из https://github.com/mozilla/gecko-dev.git
131 строка
4.7 KiB
C++
131 строка
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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 MediaSink_h_
|
|
#define MediaSink_h_
|
|
|
|
#include "MediaInfo.h"
|
|
#include "mozilla/MozPromise.h"
|
|
#include "mozilla/RefPtr.h"
|
|
#include "mozilla/dom/MediaDebugInfoBinding.h"
|
|
#include "nsISupportsImpl.h"
|
|
|
|
namespace mozilla {
|
|
|
|
class TimeStamp;
|
|
class VideoFrameContainer;
|
|
|
|
/**
|
|
* A consumer of audio/video data which plays audio and video tracks and
|
|
* manages A/V sync between them.
|
|
*
|
|
* A typical sink sends audio/video outputs to the speaker and screen.
|
|
* However, there are also sinks which capture the output of an media element
|
|
* and send the output to a MediaStream.
|
|
*
|
|
* This class is used to move A/V sync management and audio/video rendering
|
|
* out of MDSM so it is possible for subclasses to do external rendering using
|
|
* specific hardware which is required by TV projects and CDM.
|
|
*
|
|
* Note this class is not thread-safe and should be called from the state
|
|
* machine thread only.
|
|
*/
|
|
class MediaSink {
|
|
public:
|
|
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaSink);
|
|
typedef mozilla::TrackInfo::TrackType TrackType;
|
|
|
|
// EndedPromise needs to be a non-exclusive promise as it is shared between
|
|
// both the AudioSink and VideoSink.
|
|
typedef MozPromise<bool, nsresult, /* IsExclusive = */ false> EndedPromise;
|
|
|
|
// Return a promise which is resolved when the track finishes
|
|
// or null if no such track.
|
|
// Must be called after playback starts.
|
|
virtual RefPtr<EndedPromise> OnEnded(TrackType aType) = 0;
|
|
|
|
// Return the end time of the audio/video data that has been consumed
|
|
// or 0 if no such track.
|
|
// Must be called after playback starts.
|
|
virtual media::TimeUnit GetEndTime(TrackType aType) const = 0;
|
|
|
|
// Return playback position of the media.
|
|
// Since A/V sync is always maintained by this sink, there is no need to
|
|
// specify whether we want to get audio or video position.
|
|
// aTimeStamp returns the timeStamp corresponding to the returned position
|
|
// which is used by the compositor to derive the render time of video frames.
|
|
// Must be called after playback starts.
|
|
virtual media::TimeUnit GetPosition(
|
|
TimeStamp* aTimeStamp = nullptr) const = 0;
|
|
|
|
// Return true if there are data consumed but not played yet.
|
|
// Can be called in any state.
|
|
virtual bool HasUnplayedFrames(TrackType aType) const = 0;
|
|
|
|
// Set volume of the audio track.
|
|
// Do nothing if this sink has no audio track.
|
|
// Can be called in any state.
|
|
virtual void SetVolume(double aVolume) {}
|
|
|
|
// Set the playback rate.
|
|
// Can be called in any state.
|
|
virtual void SetPlaybackRate(double aPlaybackRate) {}
|
|
|
|
// Whether to preserve pitch of the audio track.
|
|
// Do nothing if this sink has no audio track.
|
|
// Can be called in any state.
|
|
virtual void SetPreservesPitch(bool aPreservesPitch) {}
|
|
|
|
// Pause/resume the playback. Only work after playback starts.
|
|
virtual void SetPlaying(bool aPlaying) = 0;
|
|
|
|
// Get the playback rate.
|
|
// Can be called in any state.
|
|
virtual double PlaybackRate() const = 0;
|
|
|
|
// Single frame rendering operation may need to be done before playback
|
|
// started (1st frame) or right after seek completed or playback stopped.
|
|
// Do nothing if this sink has no video track. Can be called in any state.
|
|
virtual void Redraw(const VideoInfo& aInfo){};
|
|
|
|
// Begin a playback session with the provided start time and media info.
|
|
// Must be called when playback is stopped.
|
|
virtual nsresult Start(const media::TimeUnit& aStartTime,
|
|
const MediaInfo& aInfo) = 0;
|
|
|
|
// Finish a playback session.
|
|
// Must be called after playback starts.
|
|
virtual void Stop() = 0;
|
|
|
|
// Return true if playback has started.
|
|
// Can be called in any state.
|
|
virtual bool IsStarted() const = 0;
|
|
|
|
// Return true if playback is started and not paused otherwise false.
|
|
// Can be called in any state.
|
|
virtual bool IsPlaying() const = 0;
|
|
|
|
// The audio output device this MediaSink is playing audio data to. The
|
|
// default device is used if this returns null.
|
|
virtual const AudioDeviceInfo* AudioDevice() { return nullptr; }
|
|
|
|
// Called on the state machine thread to shut down the sink. All resources
|
|
// allocated by this sink should be released.
|
|
// Must be called after playback stopped.
|
|
virtual void Shutdown() {}
|
|
|
|
virtual void SetSecondaryVideoContainer(VideoFrameContainer* aSecondary) {}
|
|
|
|
virtual void GetDebugInfo(dom::MediaSinkDebugInfo& aInfo) {}
|
|
|
|
protected:
|
|
virtual ~MediaSink() = default;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // MediaSink_h_
|