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/*
* 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 (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 AudioResampler_h
#define AudioResampler_h
#include "platform/audio/AudioBus.h"
#include "platform/audio/AudioResamplerKernel.h"
#include "platform/audio/AudioSourceProvider.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
// 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 {
DISALLOW_NEW();
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<std::unique_ptr<AudioResamplerKernel>> m_kernels;
RefPtr<AudioBus> m_sourceBus;
};
} // namespace blink
#endif // AudioResampler_h
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