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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef IIRProcessor_h
#define IIRProcessor_h
#include "modules/webaudio/AudioNode.h"
#include "platform/audio/AudioDSPKernel.h"
#include "platform/audio/AudioDSPKernelProcessor.h"
#include "platform/audio/IIRFilter.h"
namespace blink {
class IIRDSPKernel;
class IIRProcessor final : public AudioDSPKernelProcessor {
public:
IIRProcessor(float sampleRate, size_t numberOfChannels,
const Vector<double>& feedforwardCoef, const Vector<double>& feedbackCoef);
~IIRProcessor() override;
PassOwnPtr<AudioDSPKernel> createKernel() override;
void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) override;
// 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(int nFrequencies, const float* frequencyHz, float* magResponse, float* phaseResponse);
AudioDoubleArray* feedback() { return &m_feedback; }
AudioDoubleArray* feedforward() { return &m_feedforward; }
private:
// The feedback and feedforward filter coefficients for the IIR filter.
AudioDoubleArray m_feedback;
AudioDoubleArray m_feedforward;
// This holds the IIR kernel for computing the frequency response.
OwnPtr<IIRDSPKernel> m_responseKernel;
};
} // namespace blink
#endif // IIRProcessor_h
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