89 lines
3.5 KiB
C++
89 lines
3.5 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 "AudioDSPKernelProcessor.h"
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#include "AudioNode.h"
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#include "AudioParam.h"
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#include "Biquad.h"
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#include "BiquadFilterType.h"
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#include <memory>
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#include <wtf/RefPtr.h>
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namespace WebCore {
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// BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to implement several common filters.
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class BiquadProcessor final : public AudioDSPKernelProcessor {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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BiquadProcessor(BaseAudioContext&, float sampleRate, size_t numberOfChannels, bool autoInitialize);
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virtual ~BiquadProcessor();
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std::unique_ptr<AudioDSPKernel> createKernel() override;
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void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) override;
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void processOnlyAudioParams(size_t framesToProcess) final;
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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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void checkForDirtyCoefficients();
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bool filterCoefficientsDirty() const { return m_filterCoefficientsDirty; }
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bool hasSampleAccurateValues() const { return m_hasSampleAccurateValues; }
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AudioParam& parameter1() { return m_parameter1.get(); }
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AudioParam& parameter2() { return m_parameter2.get(); }
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AudioParam& parameter3() { return m_parameter3.get(); }
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AudioParam& parameter4() { return m_parameter4.get(); }
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BiquadFilterType type() const { return m_type; }
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void setType(BiquadFilterType);
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bool shouldUseARate() const { return m_shouldUseARate; }
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private:
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BiquadFilterType m_type { BiquadFilterType::Lowpass };
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Ref<AudioParam> m_parameter1;
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Ref<AudioParam> m_parameter2;
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Ref<AudioParam> m_parameter3;
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Ref<AudioParam> m_parameter4;
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// so DSP kernels know when to re-compute coefficients
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bool m_filterCoefficientsDirty { true };
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// Set to true if any of the filter parameters are sample-accurate.
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bool m_hasSampleAccurateValues { false };
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bool m_shouldUseARate { true };
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};
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} // namespace WebCore
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