File: biquad_dsp_kernel.h

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/*
 * Copyright (C) 2010, Google 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.
 */

#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_DSP_KERNEL_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_DSP_KERNEL_H_

#include "base/synchronization/lock.h"
#include "third_party/blink/renderer/modules/webaudio/biquad_processor.h"
#include "third_party/blink/renderer/platform/audio/biquad.h"

namespace blink {

// BiquadDSPKernel is is responsible for filtering one channel of a
// BiquadProcessor using a Biquad object.

class BiquadDSPKernel final {
 public:
  explicit BiquadDSPKernel(BiquadProcessor* processor)
      : biquad_(processor->RenderQuantumFrames()),
        tail_time_(std::numeric_limits<double>::infinity()),
        kernel_processor_(processor),
        sample_rate_(processor->SampleRate()),
        render_quantum_frames_(processor->RenderQuantumFrames()) {}

  // AudioDSPKernel
  void Process(const float* source, float* dest, uint32_t frames_to_process);
  void ProcessOnlyAudioParams(uint32_t frames_to_process) {}
  void Reset() { biquad_.Reset(); }

  float SampleRate() const { return sample_rate_; }
  unsigned RenderQuantumFrames() const { return render_quantum_frames_; }
  double Nyquist() const { return 0.5 * SampleRate(); }

  BiquadProcessor* Processor() { return kernel_processor_; }
  const BiquadProcessor* Processor() const { return kernel_processor_; }

  // Get the magnitude and phase response of the given BiquadDSPKernel at the
  // given set of frequencies (in Hz). The phase response is in radians.  This
  // must be called from the main thread.
  static void GetFrequencyResponse(BiquadDSPKernel& kernel,
                                   int n_frequencies,
                                   const float* frequency_hz,
                                   float* mag_response,
                                   float* phase_response);

  bool RequiresTailProcessing() const;
  double TailTime() const;
  double LatencyTime() const;
  // Update the biquad coefficients with the given parameters
  void UpdateCoefficients(int number_of_frames,
                          const float* frequency,
                          const float* q,
                          const float* gain,
                          const float* detune);

  // Expose HasConstantValues for unit testing
  MODULES_EXPORT static bool HasConstantValuesForTesting(float* values,
                                                         int frames_to_process);

 protected:
  Biquad biquad_;
  BiquadProcessor* GetBiquadProcessor() {
    return static_cast<BiquadProcessor*>(Processor());
  }

  void UpdateCoefficientsIfNecessary(int)
      EXCLUSIVE_LOCKS_REQUIRED(process_lock_);

 private:
  // Compute the tail time using the BiquadFilter coefficients at
  // index `coef_index`.
  void UpdateTailTime(int coef_index);

  // Synchronize process() with getting and setting the filter coefficients.
  mutable base::Lock process_lock_;

  // The current tail time for biquad filter.
  double tail_time_;

  // This raw pointer is safe because the AudioDSPKernelProcessor object is
  // guaranteed to be kept alive while the AudioDSPKernel object is alive.
  raw_ptr<BiquadProcessor> kernel_processor_;
  float sample_rate_;
  unsigned render_quantum_frames_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_DSP_KERNEL_H_