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/*
* Copyright (C) 2010, Google 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.
*/
#ifndef AudioDestinationNode_h
#define AudioDestinationNode_h
#include "AudioBuffer.h"
#include "AudioBus.h"
#include "AudioIOCallback.h"
#include "AudioNode.h"
#include "AudioSourceProvider.h"
namespace WebCore {
class AudioBus;
class AudioContext;
class AudioDestinationNode : public AudioNode, public AudioIOCallback {
public:
AudioDestinationNode(AudioContext&, float sampleRate);
virtual ~AudioDestinationNode();
// AudioNode
virtual void process(size_t) override { }; // we're pulled by hardware so this is never called
virtual void reset() override { m_currentSampleFrame = 0; }
// The audio hardware calls render() to get the next render quantum of audio into destinationBus.
// It will optionally give us local/live audio input in sourceBus (if it's not 0).
virtual void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames) override;
size_t currentSampleFrame() const { return m_currentSampleFrame; }
double currentTime() const { return currentSampleFrame() / static_cast<double>(sampleRate()); }
virtual unsigned long maxChannelCount() const { return 0; }
// Enable local/live input for the specified device.
virtual void enableInput(const String& inputDeviceId) = 0;
virtual void startRendering() = 0;
virtual void resume(std::function<void()>) { }
virtual void suspend(std::function<void()>) { }
virtual void close(std::function<void()>) { }
virtual bool isPlaying() { return false; }
virtual void isPlayingDidChange() override;
bool isPlayingAudio() const { return m_isEffectivelyPlayingAudio; }
void setMuted(bool muted) { m_muted = muted; }
protected:
virtual double tailTime() const override { return 0; }
virtual double latencyTime() const override { return 0; }
void setIsSilent(bool);
void updateIsEffectivelyPlayingAudio();
// Counts the number of sample-frames processed by the destination.
size_t m_currentSampleFrame;
bool m_isSilent;
bool m_isEffectivelyPlayingAudio;
bool m_muted;
};
} // namespace WebCore
#endif // AudioDestinationNode_h
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