Source/core/platform/audio/chromium/AudioDestinationChromium.h

/*
 * 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE 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 OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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 */

#ifndef AudioDestinationChromium_h
#define AudioDestinationChromium_h

#include "core/platform/audio/AudioBus.h"
#include "core/platform/audio/AudioDestination.h"
#include "core/platform/audio/AudioIOCallback.h"
#include "core/platform/audio/AudioSourceProvider.h"
#include "public/platform/WebAudioDevice.h"
#include "public/platform/WebVector.h"

namespace WebCore {

class AudioFIFO;
class AudioPullFIFO;

// An AudioDestination using Chromium's audio system

class AudioDestinationChromium : public AudioDestination, public WebKit::WebAudioDevice::RenderCallback, public AudioSourceProvider {
public:
    AudioDestinationChromium(AudioIOCallback&, const String& inputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, float sampleRate);
    virtual ~AudioDestinationChromium();

    virtual void start();
    virtual void stop();
    bool isPlaying() { return m_isPlaying; }

    float sampleRate() const { return m_sampleRate; }

    // WebKit::WebAudioDevice::RenderCallback
    virtual void render(const WebKit::WebVector<float*>& sourceData, const WebKit::WebVector<float*>& audioData, size_t numberOfFrames);

    // WebCore::AudioSourceProvider
    virtual void provideInput(AudioBus*, size_t framesToProcess);

private:
    AudioIOCallback& m_callback;
    unsigned m_numberOfOutputChannels;
    RefPtr<AudioBus> m_inputBus;
    RefPtr<AudioBus> m_renderBus;
    float m_sampleRate;
    bool m_isPlaying;
    OwnPtr<WebKit::WebAudioDevice> m_audioDevice;
    size_t m_callbackBufferSize;

    OwnPtr<AudioFIFO> m_inputFifo;
    OwnPtr<AudioPullFIFO> m_fifo;
};

} // namespace WebCore

#endif // AudioDestinationChromium_h