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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_WAVE_SHAPER_HANDLER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_WAVE_SHAPER_HANDLER_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_over_sample_type.h"
#include "third_party/blink/renderer/modules/webaudio/audio_handler.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class AudioNode;
class WaveShaperKernel;
// WaveShaperHandler implements non-linear distortion effects.
class WaveShaperHandler final : public AudioHandler {
public:
static scoped_refptr<WaveShaperHandler> Create(AudioNode&, float sample_rate);
~WaveShaperHandler() override;
void SetCurve(const float* curve_data, unsigned curve_length);
const Vector<float>* Curve() const;
void SetOversample(V8OverSampleType::Enum oversample);
V8OverSampleType::Enum Oversample() const;
private:
WaveShaperHandler(AudioNode& iirfilter_node, float sample_rate);
// AudioHandler
void Process(uint32_t frames_to_process) override;
void ProcessOnlyAudioParams(uint32_t frames_to_process) override {}
void Initialize() override;
void Uninitialize() override;
void CheckNumberOfChannelsForInput(AudioNodeInput*) override;
bool RequiresTailProcessing() const override;
double TailTime() const override;
double LatencyTime() const override;
void PullInputs(uint32_t frames_to_process) override;
void WaveShaperCurveValues(float* destination,
const float* source,
uint32_t frames_to_process,
const float* curve_data,
int curve_length);
const float sample_rate_;
const unsigned render_quantum_frames_;
mutable base::Lock process_lock_;
Vector<std::unique_ptr<WaveShaperKernel>> kernels_ GUARDED_BY(process_lock_);
// Tail time for the WaveShaper. This basically can have two values: 0 and
// infinity. It only takes the value of infinity if the wave shaper curve
// is such that a zero input produces a non-zero output. In this case, the
// node has an infinite tail so that silent input continues to produce
// non-silent output.
double tail_time_ GUARDED_BY(process_lock_) = 0;
double latency_time_ GUARDED_BY(process_lock_) = 0;
// `curve_` represents the non-linear shaping curve. It can be read on the
// main thread without holding `process_lock_`.
std::unique_ptr<Vector<float>> curve_;
// Can be read on the main thread without holding `process_lock_`.
V8OverSampleType::Enum oversample_ = V8OverSampleType::Enum::kNone;
// Work arrays needed by `WaveShaperCurveValues()`. There's no state or
// anything kept here. See `WaveShaperCurveValues()` for details on what
// these hold.
AudioFloatArray virtual_index_;
AudioFloatArray index_;
AudioFloatArray v1_;
AudioFloatArray v2_;
AudioFloatArray f_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_WAVE_SHAPER_HANDLER_H_
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