third_party/WebKit/Source/modules/webaudio/IIRDSPKernel.h

// 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 IIRDSPKernel_h
#define IIRDSPKernel_h

#include "modules/webaudio/IIRProcessor.h"
#include "platform/audio/AudioDSPKernel.h"
#include "platform/audio/IIRFilter.h"

namespace blink {

class IIRProcessor;

class IIRDSPKernel final : public AudioDSPKernel {
 public:
  explicit IIRDSPKernel(IIRProcessor* processor)
      : AudioDSPKernel(processor),
        m_iir(processor->feedforward(), processor->feedback()) {}

  // AudioDSPKernel
  void process(const float* source,
               float* dest,
               size_t framesToProcess) override;
  void reset() override { m_iir.reset(); }

  // 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);

  double tailTime() const override;
  double latencyTime() const override;

 protected:
  IIRFilter m_iir;
};

}  // namespace blink

#endif  // IIRDSPKernel_h