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/*
* Copyright 2016 The Chromium Authors. All rights reserved.
* Copyright (C) 2020, Apple 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 "AudioDSPKernelProcessor.h"
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
namespace WebCore {
class IIRDSPKernel;
class IIRProcessor final : public AudioDSPKernelProcessor {
WTF_MAKE_TZONE_ALLOCATED(IIRProcessor);
public:
IIRProcessor(float sampleRate, unsigned numberOfChannels, const Vector<double>& feedforward, const Vector<double>& feedback, bool isFilterStable);
~IIRProcessor();
// AudioDSPKernelProcessor.
void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) final;
std::unique_ptr<AudioDSPKernel> createKernel() final;
// Get the magnitude and phase response of the filter at the given set of frequencies (in Hz). The phase response is in radians.
void getFrequencyResponse(unsigned length, std::span<const float> frequencyHz, std::span<float> magResponse, std::span<float> phaseResponse);
const Vector<double>& feedforward() const { return m_feedforward; }
const Vector<double>& feedback() const { return m_feedback; }
bool isFilterStable() const { return m_isFilterStable; }
private:
Type processorType() const final { return Type::IIR; }
Vector<double> m_feedforward;
Vector<double> m_feedback;
bool m_isFilterStable;
std::unique_ptr<IIRDSPKernel> m_responseKernel;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::IIRProcessor) \
static bool isType(const WebCore::AudioProcessor& processor) { return processor.processorType() == WebCore::AudioProcessor::Type::IIR; } \
SPECIALIZE_TYPE_TRAITS_END()
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