74 lines
3.0 KiB
C++
74 lines
3.0 KiB
C++
/*
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* Copyright (C) 2011, Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "AudioArray.h"
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#include "AudioDSPKernel.h"
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#include "DownSampler.h"
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#include "UpSampler.h"
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#include "WaveShaperProcessor.h"
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#include <memory>
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namespace WebCore {
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// WaveShaperDSPKernel is an AudioDSPKernel and is responsible for non-linear distortion on one channel.
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class WaveShaperDSPKernel final : public AudioDSPKernel {
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public:
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explicit WaveShaperDSPKernel(WaveShaperProcessor*);
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// AudioDSPKernel
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void process(const float* source, float* dest, size_t framesToProcess) final;
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void reset() final;
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double tailTime() const final { return 0; }
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double latencyTime() const final;
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// Oversampling requires more resources, so let's only allocate them if needed.
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void lazyInitializeOversampling();
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private:
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// Apply the shaping curve.
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void processCurve(const float* source, float* dest, size_t framesToProcess);
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// Use up-sampling, process at the higher sample-rate, then down-sample.
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void processCurve2x(const float* source, float* dest, size_t framesToProcess);
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void processCurve4x(const float* source, float* dest, size_t framesToProcess);
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bool requiresTailProcessing() const final;
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WaveShaperProcessor* waveShaperProcessor() { return static_cast<WaveShaperProcessor*>(processor()); }
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const WaveShaperProcessor* waveShaperProcessor() const { return static_cast<const WaveShaperProcessor*>(processor()); }
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// Oversampling.
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std::unique_ptr<AudioFloatArray> m_tempBuffer;
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std::unique_ptr<AudioFloatArray> m_tempBuffer2;
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std::unique_ptr<UpSampler> m_upSampler;
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std::unique_ptr<DownSampler> m_downSampler;
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std::unique_ptr<UpSampler> m_upSampler2;
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std::unique_ptr<DownSampler> m_downSampler2;
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};
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} // namespace WebCore
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