77 lines
3.1 KiB
C++
77 lines
3.1 KiB
C++
/*
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* Copyright (C) 2010, 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 "AudioDSPKernel.h"
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#include "Biquad.h"
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#include "BiquadProcessor.h"
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namespace WebCore {
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class BiquadProcessor;
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// BiquadDSPKernel is an AudioDSPKernel and is responsible for filtering one channel of a BiquadProcessor using a Biquad object.
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class BiquadDSPKernel final : public AudioDSPKernel {
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public:
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explicit BiquadDSPKernel(BiquadProcessor* processor)
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: AudioDSPKernel(processor)
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{
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}
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// AudioDSPKernel
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void process(const float* source, float* dest, size_t framesToProcess) override;
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void reset() override { m_biquad.reset(); }
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// Get the magnitude and phase response of the filter at the given
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// set of frequencies (in Hz). The phase response is in radians.
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void getFrequencyResponse(unsigned nFrequencies, const float* frequencyHz, float* magResponse, float* phaseResponse);
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double tailTime() const override;
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double latencyTime() const override;
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void updateCoefficients(size_t numberOfFrames, const float* cutoffFrequency, const float* q, const float* gain, const float* detune);
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bool requiresTailProcessing() const final;
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private:
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Biquad m_biquad;
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BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(processor()); }
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// To prevent audio glitches when parameters are changed,
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// dezippering is used to slowly change the parameters.
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// |useSmoothing| implies that we want to update using the
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// smoothed values. Otherwise the final target values are
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// used. If |forceUpdate| is true, we update the coefficients even
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// if they are not dirty. (Used when computing the frequency
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// response.)
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void updateCoefficientsIfNecessary(size_t framesToProcess);
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void updateTailTime(size_t coefIndex);
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double m_tailTime { std::numeric_limits<double>::infinity() };
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};
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} // namespace WebCore
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