зеркало из https://github.com/mozilla/gecko-dev.git
110 строки
3.4 KiB
C++
110 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#if !defined(DecodedAudioDataSink_h__)
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#define DecodedAudioDataSink_h__
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#include "AudioSink.h"
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#include "AudioStream.h"
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#include "MediaEventSource.h"
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#include "MediaInfo.h"
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#include "mozilla/RefPtr.h"
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#include "nsISupportsImpl.h"
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#include "mozilla/dom/AudioChannelBinding.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/MozPromise.h"
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#include "mozilla/ReentrantMonitor.h"
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namespace mozilla {
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namespace media {
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class DecodedAudioDataSink : public AudioSink,
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private AudioStream::DataSource {
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public:
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DecodedAudioDataSink(MediaQueue<MediaData>& aAudioQueue,
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int64_t aStartTime,
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const AudioInfo& aInfo,
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dom::AudioChannel aChannel);
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// Return a promise which will be resolved when DecodedAudioDataSink
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// finishes playing, or rejected if any error.
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RefPtr<GenericPromise> Init(const PlaybackParams& aParams) override;
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/*
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* All public functions are not thread-safe.
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* Called on the task queue of MDSM only.
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*/
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int64_t GetPosition() override;
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int64_t GetEndTime() const override;
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// Check whether we've pushed more frames to the audio hardware than it has
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// played.
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bool HasUnplayedFrames() override;
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// Shut down the DecodedAudioDataSink's resources.
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void Shutdown() override;
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void SetVolume(double aVolume) override;
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void SetPlaybackRate(double aPlaybackRate) override;
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void SetPreservesPitch(bool aPreservesPitch) override;
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void SetPlaying(bool aPlaying) override;
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private:
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virtual ~DecodedAudioDataSink();
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// Allocate and initialize mAudioStream. Returns NS_OK on success.
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nsresult InitializeAudioStream(const PlaybackParams& aParams);
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// Interface of AudioStream::DataSource.
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// Called on the callback thread of cubeb.
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UniquePtr<AudioStream::Chunk> PopFrames(uint32_t aFrames) override;
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bool Ended() const override;
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void Drained() override;
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// The audio stream resource. Used on the task queue of MDSM only.
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RefPtr<AudioStream> mAudioStream;
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// The presentation time of the first audio frame that was played in
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// microseconds. We can add this to the audio stream position to determine
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// the current audio time.
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const int64_t mStartTime;
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// PCM frames written to the stream so far.
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Atomic<int64_t> mWritten;
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// Keep the last good position returned from the audio stream. Used to ensure
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// position returned by GetPosition() is mono-increasing in spite of audio
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// stream error. Used on the task queue of MDSM only.
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int64_t mLastGoodPosition;
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const AudioInfo mInfo;
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const dom::AudioChannel mChannel;
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// Used on the task queue of MDSM only.
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bool mPlaying;
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MozPromiseHolder<GenericPromise> mEndPromise;
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/*
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* Members to implement AudioStream::DataSource.
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* Used on the callback thread of cubeb.
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*/
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// The AudioData at which AudioStream::DataSource is reading.
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RefPtr<AudioData> mCurrentData;
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// Keep track of the read positoin of mCurrentData.
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UniquePtr<AudioBufferCursor> mCursor;
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// True if there is any error in processing audio data like overflow.
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bool mErrored = false;
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};
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} // namespace media
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} // namespace mozilla
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#endif
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