/*
* 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
* 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 AudioDestination_h
#define AudioDestination_h
#include "platform/audio/AudioBus.h"
#include "platform/audio/AudioIOCallback.h"
#include "platform/audio/AudioSourceProvider.h"
#include "public/platform/WebAudioDevice.h"
#include "public/platform/WebVector.h"
#include "wtf/Noncopyable.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
class AudioFIFO;
class AudioPullFIFO;
// An AudioDestination using Chromium's audio system
class PLATFORM_EXPORT AudioDestination : public blink::WebAudioDevice::RenderCallback, public AudioSourceProvider {
WTF_MAKE_NONCOPYABLE(AudioDestination);
public:
AudioDestination(AudioIOCallback&, const String& inputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, float sampleRate);
virtual ~AudioDestination();
// Pass in (numberOfInputChannels > 0) if live/local audio input is desired.
// Port-specific device identification information for live/local input streams can be passed in the inputDeviceId.
static PassOwnPtr<AudioDestination> create(AudioIOCallback&, const String& inputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, float sampleRate);
virtual void start();
virtual void stop();
bool isPlaying() { return m_isPlaying; }
float sampleRate() const { return m_sampleRate; }
// blink::WebAudioDevice::RenderCallback
virtual void render(const blink::WebVector<float*>& sourceData, const blink::WebVector<float*>& audioData, size_t numberOfFrames) OVERRIDE;
// WebCore::AudioSourceProvider
virtual void provideInput(AudioBus*, size_t framesToProcess) OVERRIDE;
static float hardwareSampleRate();
// maxChannelCount() returns the total number of output channels of the audio hardware.
// A value of 0 indicates that the number of channels cannot be configured and
// that only stereo (2-channel) destinations can be created.
// The numberOfOutputChannels parameter of AudioDestination::create() is allowed to
// be a value: 1 <= numberOfOutputChannels <= maxChannelCount(),
// or if maxChannelCount() equals 0, then numberOfOutputChannels must be 2.
static unsigned long maxChannelCount();
private:
AudioIOCallback& m_callback;
unsigned m_numberOfOutputChannels;
RefPtr<AudioBus> m_inputBus;
RefPtr<AudioBus> m_renderBus;
float m_sampleRate;
bool m_isPlaying;
OwnPtr<blink::WebAudioDevice> m_audioDevice;
size_t m_callbackBufferSize;
OwnPtr<AudioFIFO> m_inputFifo;
OwnPtr<AudioPullFIFO> m_fifo;
};
} // namespace WebCore
#endif // AudioDestination_h