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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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_RESAMPLER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_RESAMPLER_H_
#include <memory>
#include "base/macros.h"
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
#include "third_party/blink/renderer/platform/audio/audio_resampler_kernel.h"
#include "third_party/blink/renderer/platform/audio/audio_source_provider.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
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();
public:
AudioResampler();
AudioResampler(unsigned number_of_channels);
~AudioResampler() = default;
// Given an AudioSourceProvider, process() resamples the source stream into
// destinationBus.
void Process(AudioSourceProvider*,
AudioBus* destination_bus,
uint32_t frames_to_process);
// Resets the processing state.
void Reset();
void ConfigureChannels(unsigned number_of_channels);
// 0 < rate <= MaxRate
void SetRate(double rate);
double Rate() const { return rate_; }
static const double kMaxRate;
private:
double rate_;
Vector<std::unique_ptr<AudioResamplerKernel>> kernels_;
scoped_refptr<AudioBus> source_bus_;
DISALLOW_COPY_AND_ASSIGN(AudioResampler);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_RESAMPLER_H_