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// 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 THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_IIR_FILTER_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_IIR_FILTER_NODE_H_
#include "base/single_thread_task_runner.h"
#include "third_party/blink/renderer/core/typed_arrays/array_buffer_view_helpers.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_typed_array.h"
#include "third_party/blink/renderer/modules/webaudio/audio_basic_processor_handler.h"
#include "third_party/blink/renderer/modules/webaudio/audio_node.h"
#include "third_party/blink/renderer/modules/webaudio/iir_processor.h"
namespace blink {
class BaseAudioContext;
class ExceptionState;
class IIRFilterOptions;
class IIRFilterHandler : public AudioBasicProcessorHandler {
public:
static scoped_refptr<IIRFilterHandler> Create(
AudioNode&,
float sample_rate,
const Vector<double>& feedforward_coef,
const Vector<double>& feedback_coef,
bool is_filter_stable);
void Process(uint32_t frames_to_process) override;
private:
IIRFilterHandler(AudioNode&,
float sample_rate,
const Vector<double>& feedforward_coef,
const Vector<double>& feedback_coef,
bool is_filter_stable);
void NotifyBadState() const;
// Only notify the user of the once. No need to spam the console with
// messages, because once we're in a bad state, it usually stays that way
// forever. Only accessed from audio thread.
bool did_warn_bad_filter_state_ = false;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
};
class IIRFilterNode : public AudioNode {
DEFINE_WRAPPERTYPEINFO();
public:
static IIRFilterNode* Create(BaseAudioContext&,
const Vector<double>& feedforward,
const Vector<double>& feedback,
ExceptionState&);
static IIRFilterNode* Create(BaseAudioContext*,
const IIRFilterOptions*,
ExceptionState&);
IIRFilterNode(BaseAudioContext&,
const Vector<double>& denominator,
const Vector<double>& numerator,
bool is_filter_stable);
void Trace(blink::Visitor*) override;
// 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(NotShared<const DOMFloat32Array> frequency_hz,
NotShared<DOMFloat32Array> mag_response,
NotShared<DOMFloat32Array> phase_response,
ExceptionState&);
private:
IIRProcessor* GetIIRFilterProcessor() const;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_IIR_FILTER_NODE_H_
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