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/*
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(WEB_AUDIO)
#include "AudioDestination.h"
#include "PushPullFIFO.h"
#include <wtf/Lock.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class AudioBus;
class MultiChannelResampler;
// Base class for audio destinations that may need resampling.
// The subclass should use m_outputBus to access the rendering.
class AudioDestinationResampler : public AudioDestination {
public:
WEBCORE_EXPORT AudioDestinationResampler(AudioIOCallback&, unsigned numberOfOutputChannels, float inputSampleRate, float outputSampleRate);
WEBCORE_EXPORT virtual ~AudioDestinationResampler();
WEBCORE_EXPORT void start(Function<void(Function<void()>&&)>&& dispatchToRenderThread, CompletionHandler<void(bool)>&&) final;
WEBCORE_EXPORT void stop(CompletionHandler<void(bool)>&&) final;
protected:
WEBCORE_EXPORT void setIsPlaying(bool);
bool isPlaying() final { return m_isPlaying; }
WEBCORE_EXPORT unsigned framesPerBuffer() const final;
// The caller is expected to call both pullRendered and render.
// The caller fills the m_outputBus channel data pointers before calling this.
// Returns the number of frames to render.
WEBCORE_EXPORT size_t pullRendered(size_t numberOfFrames);
WEBCORE_EXPORT bool render(double sampleTime, MonotonicTime hostTime, size_t framesToRender);
private:
void renderOnRenderingThreadIfPlaying(size_t framesToRender);
virtual void startRendering(CompletionHandler<void(bool)>&&) = 0;
virtual void stopRendering(CompletionHandler<void(bool)>&&) = 0;
protected:
// To pass the data from FIFO to the audio device callback.
Ref<AudioBus> m_outputBus;
private:
// To push the rendered result from WebAudio graph into the FIFO.
Ref<AudioBus> m_renderBus;
// Resolves the buffer size mismatch between the WebAudio engine and
// the callback function from the actual audio device.
Lock m_fifoLock;
PushPullFIFO m_fifo WTF_GUARDED_BY_LOCK(m_fifoLock);
std::unique_ptr<MultiChannelResampler> m_resampler;
AudioIOPosition m_outputTimestamp;
Lock m_dispatchToRenderThreadLock;
Function<void(Function<void()>&&)> m_dispatchToRenderThread WTF_GUARDED_BY_LOCK(m_dispatchToRenderThreadLock);
std::atomic<bool> m_isPlaying;
};
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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