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/*
* Copyright (C) 2011, 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.
*/
#pragma once
#include "AudioArray.h"
#include "AudioDSPKernel.h"
#include "DownSampler.h"
#include "UpSampler.h"
#include "WaveShaperProcessor.h"
#include <memory>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
// WaveShaperDSPKernel is an AudioDSPKernel and is responsible for non-linear distortion on one channel.
class WaveShaperDSPKernel final : public AudioDSPKernel {
WTF_MAKE_TZONE_ALLOCATED(WaveShaperDSPKernel);
public:
explicit WaveShaperDSPKernel(WaveShaperProcessor*);
// AudioDSPKernel
void process(std::span<const float> source, std::span<float> destination) final;
void reset() final;
double tailTime() const final { return 0; }
double latencyTime() const final;
// Oversampling requires more resources, so let's only allocate them if needed.
void lazyInitializeOversampling();
private:
// Apply the shaping curve.
void processCurve(std::span<const float> source, std::span<float> destination);
// Use up-sampling, process at the higher sample-rate, then down-sample.
void processCurve2x(std::span<const float> source, std::span<float> destination);
void processCurve4x(std::span<const float> source, std::span<float> destination);
bool requiresTailProcessing() const final;
WaveShaperProcessor* waveShaperProcessor() { return downcast<WaveShaperProcessor>(processor()); }
const WaveShaperProcessor* waveShaperProcessor() const { return downcast<WaveShaperProcessor>(processor()); }
// Oversampling.
std::unique_ptr<AudioFloatArray> m_tempBuffer;
std::unique_ptr<AudioFloatArray> m_tempBuffer2;
std::unique_ptr<UpSampler> m_upSampler;
std::unique_ptr<DownSampler> m_downSampler;
std::unique_ptr<UpSampler> m_upSampler2;
std::unique_ptr<DownSampler> m_downSampler2;
};
} // namespace WebCore
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