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/*
* Copyright (C) 2011, 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 "AudioDestinationNode.h"
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
class AudioBuffer;
class AudioBus;
class OfflineAudioContext;
class OfflineAudioDestinationNode final : public AudioDestinationNode {
WTF_MAKE_ISO_ALLOCATED(OfflineAudioDestinationNode);
public:
OfflineAudioDestinationNode(OfflineAudioContext&, unsigned numberOfChannels, float sampleRate, RefPtr<AudioBuffer>&& renderTarget);
~OfflineAudioDestinationNode();
OfflineAudioContext& context();
const OfflineAudioContext& context() const;
AudioBuffer* renderTarget() const { return m_renderTarget.get(); }
// AudioNode
void initialize() final;
void uninitialize() final;
// AudioDestinationNode
void enableInput(const String&) final { }
void startRendering(CompletionHandler<void(std::optional<Exception>&&)>&&) final;
private:
enum class RenderResult { Failure, Suspended, Complete };
RenderResult renderOnAudioThread();
void notifyOfflineRenderingSuspended();
bool requiresTailProcessing() const final { return false; }
unsigned maxChannelCount() const final { return m_numberOfChannels; }
unsigned m_numberOfChannels;
// This AudioNode renders into this AudioBuffer.
RefPtr<AudioBuffer> m_renderTarget;
// Temporary AudioBus for each render quantum.
RefPtr<AudioBus> m_renderBus;
// Rendering thread.
RefPtr<Thread> m_renderThread;
size_t m_framesToProcess;
size_t m_destinationOffset { 0 };
bool m_startedRendering { false };
};
} // namespace WebCore