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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_PROCESSOR_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_PROCESSOR_H_
#include <memory>
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node.h"
#include "third_party/blink/renderer/modules/webaudio/audio_param.h"
#include "third_party/blink/renderer/platform/audio/biquad.h"
namespace blink {
// BiquadProcessor processes one input -> one output (N channels each). It uses
// one AudioDSPKernel object per channel to do the processing, thus there is no
// cross-channel processing. It uses Biquad objects to implement several common
// filters.
class BiquadDSPKernel;
class BiquadProcessor final {
public:
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class FilterType {
kLowPass = 0,
kHighPass = 1,
kBandPass = 2,
kLowShelf = 3,
kHighShelf = 4,
kPeaking = 5,
kNotch = 6,
kAllpass = 7,
kMaxValue = kAllpass,
};
BiquadProcessor(float sample_rate,
uint32_t number_of_channels,
unsigned render_quantum_frames,
AudioParamHandler& frequency,
AudioParamHandler& q,
AudioParamHandler& gain,
AudioParamHandler& detune);
~BiquadProcessor();
std::unique_ptr<BiquadDSPKernel> CreateKernel();
void Initialize();
void Uninitialize();
void Process(const AudioBus* source,
AudioBus* destination,
uint32_t frames_to_process);
void ProcessOnlyAudioParams(uint32_t frames_to_process);
void Reset();
bool IsInitialized() const { return initialized_; }
float SampleRate() const { return sample_rate_; }
unsigned RenderQuantumFrames() const { return render_quantum_frames_; }
double TailTime() const;
double LatencyTime() const;
bool RequiresTailProcessing() const;
void SetNumberOfChannels(unsigned);
unsigned NumberOfChannels() const { return number_of_channels_; }
// 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 n_frequencies,
const float* frequency_hz,
float* mag_response,
float* phase_response);
void CheckForDirtyCoefficients();
bool FilterCoefficientsDirty() const { return filter_coefficients_dirty_; }
bool HasSampleAccurateValues() const { return has_sample_accurate_values_; }
bool IsAudioRate() const { return is_audio_rate_; }
AudioParamHandler& Parameter1() { return *parameter1_; }
AudioParamHandler& Parameter2() { return *parameter2_; }
AudioParamHandler& Parameter3() { return *parameter3_; }
AudioParamHandler& Parameter4() { return *parameter4_; }
FilterType GetType() const { return type_; }
void SetType(FilterType);
private:
FilterType type_ = FilterType::kLowPass;
scoped_refptr<AudioParamHandler> parameter1_;
scoped_refptr<AudioParamHandler> parameter2_;
scoped_refptr<AudioParamHandler> parameter3_;
scoped_refptr<AudioParamHandler> parameter4_;
// so DSP kernels know when to re-compute coefficients
bool filter_coefficients_dirty_ = true;
// Set to true if any of the filter parameters are sample-accurate.
bool has_sample_accurate_values_ = false;
// Set to true if any of the filter parameters are a-rate.
bool is_audio_rate_;
bool has_just_reset_ = true;
// Cache previous parameter values to allow us to skip recomputing filter
// coefficients when parameters are not changing
float previous_parameter1_ = std::numeric_limits<float>::quiet_NaN();
float previous_parameter2_ = std::numeric_limits<float>::quiet_NaN();
float previous_parameter3_ = std::numeric_limits<float>::quiet_NaN();
float previous_parameter4_ = std::numeric_limits<float>::quiet_NaN();
bool initialized_ = false;
unsigned number_of_channels_;
float sample_rate_;
unsigned render_quantum_frames_;
Vector<std::unique_ptr<BiquadDSPKernel>> kernels_ GUARDED_BY(process_lock_);
mutable base::Lock process_lock_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_PROCESSOR_H_
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