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98 lines
3.3 KiB
C++
98 lines
3.3 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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#ifndef AudioAvailableEventManager_h__
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#define AudioAvailableEventManager_h__
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#include "nsAutoPtr.h"
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#include "nsTArray.h"
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#include "AudioSampleFormat.h"
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#include "mozilla/ReentrantMonitor.h"
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class nsIRunnable;
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template <class T> class nsCOMPtr;
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namespace mozilla {
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class MediaDecoder;
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class AudioAvailableEventManager
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{
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public:
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AudioAvailableEventManager(MediaDecoder* aDecoder);
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~AudioAvailableEventManager();
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// Initialize the event manager with audio metadata. Called before
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// audio begins to get queued or events are dispatched.
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void Init(uint32_t aChannels, uint32_t aRate);
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// Dispatch pending MozAudioAvailable events in the queue. Called
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// from the state machine thread.
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void DispatchPendingEvents(uint64_t aCurrentTime);
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// Queues audio sample data and re-packages it into equal sized
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// framebuffers. Called from the audio thread.
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void QueueWrittenAudioData(AudioDataValue* aAudioData,
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uint32_t aAudioDataLength,
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uint64_t aEndTimeSampleOffset);
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// Clears the queue of any existing events. Called from both the state
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// machine and audio threads.
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void Clear();
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// Fires one last event for any extra samples that didn't fit in a whole
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// framebuffer. This is meant to be called only once when the audio finishes.
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// Called from the state machine thread.
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void Drain(uint64_t aTime);
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// Sets the size of the signal buffer.
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// Called from the main and the state machine thread.
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void SetSignalBufferLength(uint32_t aLength);
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// Called by the media element to notify the manager that there is a
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// listener on the "MozAudioAvailable" event, and that we need to dispatch
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// such events. Called from the main thread.
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void NotifyAudioAvailableListener();
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private:
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// The decoder associated with the event manager. The event manager shares
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// the same lifetime as the decoder (the decoder holds a reference to the
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// manager).
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MediaDecoder* mDecoder;
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// The number of samples per second.
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float mSamplesPerSecond;
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// A buffer for audio data to be dispatched in DOM events.
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nsAutoArrayPtr<float> mSignalBuffer;
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// The current size of the signal buffer, may change due to DOM calls.
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uint32_t mSignalBufferLength;
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// The size of the new signal buffer, may change due to DOM calls.
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uint32_t mNewSignalBufferLength;
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// The position of the first available item in mSignalBuffer
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uint32_t mSignalBufferPosition;
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// The MozAudioAvailable events to be dispatched. This queue is shared
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// between the state machine and audio threads.
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nsTArray< nsCOMPtr<nsIRunnable> > mPendingEvents;
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// ReentrantMonitor for shared access to mPendingEvents queue or
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// buffer length.
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ReentrantMonitor mReentrantMonitor;
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// True if something in the owning document has a listener on the
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// "MozAudioAvailable" event. If not, we don't need to bother copying played
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// audio data and dispatching the event. Synchronized by mReentrantMonitor.
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bool mHasListener;
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};
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} // namespace mozilla
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#endif
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