DefaultAudioDestinationNode.h   [plain text]

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1.  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    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
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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#pragma once

#include "AudioDestinationNode.h"

namespace WebCore {

class AudioDestination;
    
class DefaultAudioDestinationNode final : public AudioDestinationNode {
    WTF_MAKE_ISO_ALLOCATED(DefaultAudioDestinationNode);
public:
    static Ref<DefaultAudioDestinationNode> create(BaseAudioContext& context, Optional<float> sampleRate = WTF::nullopt)
    {
        return adoptRef(*new DefaultAudioDestinationNode(context, sampleRate));
    }
    
    virtual ~DefaultAudioDestinationNode();

    unsigned framesPerBuffer() const;
    
    void startRendering(CompletionHandler<void(Optional<Exception>&&)>&&) final;

private:
    DefaultAudioDestinationNode(BaseAudioContext&, Optional<float>);

    void createDestination();
    void clearDestination();
    void recreateDestination();

    Function<void(Function<void()>&&)> dispatchToRenderThreadFunction();

    void initialize() final;
    void uninitialize() final;
    ExceptionOr<void> setChannelCount(unsigned) final;

    bool requiresTailProcessing() const final { return false; }

    void enableInput(const String& inputDeviceId) final;
    void resume(CompletionHandler<void(Optional<Exception>&&)>&&) final;
    void suspend(CompletionHandler<void(Optional<Exception>&&)>&&) final;
    void restartRendering() final;
    void close(CompletionHandler<void()>&&) final;
    unsigned maxChannelCount() const final;
    bool isPlaying() final;

    RefPtr<AudioDestination> m_destination;
    bool m_wasDestinationStarted { false };
    String m_inputDeviceId;
    unsigned m_numberOfInputChannels { 0 };
};

} // namespace WebCore