/*
* 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.
*
* 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AudioResampler_h
#define AudioResampler_h
#include "platform/audio/AudioBus.h"
#include "platform/audio/AudioResamplerKernel.h"
#include "platform/audio/AudioSourceProvider.h"
#include "wtf/Noncopyable.h"
#include "wtf/OwnPtr.h"
#include "wtf/Vector.h"
namespace WebCore {
// AudioResampler resamples the audio stream from an AudioSourceProvider.
// The audio stream may be single or multi-channel.
// The default constructor defaults to single-channel (mono).
class PLATFORM_EXPORT AudioResampler {
WTF_MAKE_NONCOPYABLE(AudioResampler);
public:
AudioResampler();
AudioResampler(unsigned numberOfChannels);
~AudioResampler() { }
// Given an AudioSourceProvider, process() resamples the source stream into destinationBus.
void process(AudioSourceProvider*, AudioBus* destinationBus, size_t framesToProcess);
// Resets the processing state.
void reset();
void configureChannels(unsigned numberOfChannels);
// 0 < rate <= MaxRate
void setRate(double rate);
double rate() const { return m_rate; }
static const double MaxRate;
private:
double m_rate;
Vector<OwnPtr<AudioResamplerKernel> > m_kernels;
RefPtr<AudioBus> m_sourceBus;
};
} // namespace WebCore
#endif // AudioResampler_h