blob: a2160eebdc86c85ccc0dc42ea325a72a9b219cc5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// 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_PROCESSOR_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_IIR_PROCESSOR_H_
#include <memory>
#include "third_party/blink/renderer/modules/webaudio/audio_node.h"
#include "third_party/blink/renderer/platform/audio/audio_dsp_kernel.h"
#include "third_party/blink/renderer/platform/audio/audio_dsp_kernel_processor.h"
#include "third_party/blink/renderer/platform/audio/iir_filter.h"
namespace blink {
class IIRDSPKernel;
class IIRProcessor final : public AudioDSPKernelProcessor {
public:
IIRProcessor(float sample_rate,
uint32_t number_of_channels,
const Vector<double>& feedforward_coef,
const Vector<double>& feedback_coef,
bool is_filter_stable);
~IIRProcessor() override;
std::unique_ptr<AudioDSPKernel> CreateKernel() override;
void Process(const AudioBus* source,
AudioBus* destination,
uint32_t frames_to_process) 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(int n_frequencies,
const float* frequency_hz,
float* mag_response,
float* phase_response);
AudioDoubleArray* Feedback() { return &feedback_; }
AudioDoubleArray* Feedforward() { return &feedforward_; }
bool IsFilterStable() const { return is_filter_stable_; }
private:
// The feedback and feedforward filter coefficients for the IIR filter.
AudioDoubleArray feedback_;
AudioDoubleArray feedforward_;
bool is_filter_stable_;
// This holds the IIR kernel for computing the frequency response.
std::unique_ptr<IIRDSPKernel> response_kernel_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_IIR_PROCESSOR_H_
|
