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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 "third_party/blink/renderer/modules/webaudio/biquad_processor.h"
#include "third_party/blink/renderer/platform/audio/audio_dsp_kernel.h"
#include "third_party/blink/renderer/platform/audio/biquad.h"
namespace blink {
class BiquadProcessor;
// BiquadDSPKernel is an AudioDSPKernel and is responsible for filtering one
// channel of a BiquadProcessor using a Biquad object.
class BiquadDSPKernel final : public AudioDSPKernel {
public:
explicit BiquadDSPKernel(BiquadProcessor* processor)
: AudioDSPKernel(processor),
tail_time_(std::numeric_limits<double>::infinity()) {}
// AudioDSPKernel
void Process(const float* source,
float* dest,
uint32_t frames_to_process) override;
void Reset() override { biquad_.Reset(); }
// 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 final;
double TailTime() const override;
double LatencyTime() const override;
// Update the biquad cofficients with the given parameters
void UpdateCoefficients(int number_of_frames,
const float* frequency,
const float* q,
const float* gain,
const float* detune);
protected:
Biquad biquad_;
BiquadProcessor* GetBiquadProcessor() {
return static_cast<BiquadProcessor*>(Processor());
}
// To prevent audio glitches when parameters are changed,
// dezippering is used to slowly change the parameters.
void UpdateCoefficientsIfNecessary(int);
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 Mutex process_lock_;
// The current tail time for biquad filter.
double tail_time_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_DSP_KERNEL_H_
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