70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
/*
|
|
* 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 "AudioBus.h"
|
|
#include "AudioResamplerKernel.h"
|
|
#include "AudioSourceProvider.h"
|
|
#include <memory>
|
|
#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 AudioResampler final {
|
|
WTF_MAKE_FAST_ALLOCATED;
|
|
public:
|
|
AudioResampler();
|
|
AudioResampler(unsigned numberOfChannels);
|
|
~AudioResampler() = default;
|
|
|
|
// 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 constexpr double MaxRate { 8 };
|
|
|
|
private:
|
|
double m_rate { 1 };
|
|
Vector<std::unique_ptr<AudioResamplerKernel>> m_kernels;
|
|
RefPtr<AudioBus> m_sourceBus;
|
|
};
|
|
|
|
} // namespace WebCore
|
|
|
|
#endif // AudioResampler_h
|