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/*
* Copyright (C) 2010, Google Inc. All rights reserved.
* Copyright (C) 2020-2021, 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
#include "AudioNode.h"
#include <wtf/CompletionHandler.h>
namespace WebCore {
class AudioBus;
struct AudioIOPosition;
class AudioDestinationNode : public AudioNode {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(AudioDestinationNode);
public:
~AudioDestinationNode();
// AudioNode
void process(size_t) final { } // we're pulled by hardware so this is never called
float sampleRate() const final { return m_sampleRate; }
size_t currentSampleFrame() const { return m_currentSampleFrame; }
double currentTime() const { return currentSampleFrame() / static_cast<double>(sampleRate()); }
virtual unsigned maxChannelCount() const = 0;
// Enable local/live input for the specified device.
virtual void enableInput(const String& inputDeviceId) = 0;
virtual void startRendering(CompletionHandler<void(std::optional<Exception>&&)>&&) = 0;
virtual void restartRendering() { }
// AudioDestinationNodes are owned by the BaseAudioContext so we forward the refcounting to its BaseAudioContext.
void ref() const final;
void deref() const final;
protected:
AudioDestinationNode(BaseAudioContext&, float sampleRate);
double tailTime() const final { return 0; }
double latencyTime() const final { return 0; }
void renderQuantum(AudioBus* destinationBus, size_t numberOfFrames, const AudioIOPosition& outputPosition);
private:
// Counts the number of sample-frames processed by the destination.
std::atomic<size_t> m_currentSampleFrame { 0 };
float m_sampleRate;
};
} // namespace WebCore
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