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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* 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 BiquadProcessor_h
#define BiquadProcessor_h
#include "modules/webaudio/AudioNode.h"
#include "modules/webaudio/AudioParam.h"
#include "platform/audio/AudioDSPKernel.h"
#include "platform/audio/AudioDSPKernelProcessor.h"
#include "platform/audio/Biquad.h"
#include "wtf/RefPtr.h"
namespace blink {
// BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to implement several common filters.
class BiquadProcessor final : public AudioDSPKernelProcessor {
public:
enum FilterType {
LowPass = 0,
HighPass = 1,
BandPass = 2,
LowShelf = 3,
HighShelf = 4,
Peaking = 5,
Notch = 6,
Allpass = 7
};
BiquadProcessor(float sampleRate, size_t numberOfChannels, AudioParamHandler& frequency, AudioParamHandler& q, AudioParamHandler& gain, AudioParamHandler& detune);
~BiquadProcessor() override;
PassOwnPtr<AudioDSPKernel> createKernel() override;
void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) 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 nFrequencies, const float* frequencyHz, float* magResponse, float* phaseResponse);
void checkForDirtyCoefficients();
bool filterCoefficientsDirty() const { return m_filterCoefficientsDirty; }
bool hasSampleAccurateValues() const { return m_hasSampleAccurateValues; }
AudioParamHandler& parameter1() { return *m_parameter1; }
AudioParamHandler& parameter2() { return *m_parameter2; }
AudioParamHandler& parameter3() { return *m_parameter3; }
AudioParamHandler& parameter4() { return *m_parameter4; }
FilterType type() const { return m_type; }
void setType(FilterType);
private:
FilterType m_type;
RefPtr<AudioParamHandler> m_parameter1;
RefPtr<AudioParamHandler> m_parameter2;
RefPtr<AudioParamHandler> m_parameter3;
RefPtr<AudioParamHandler> m_parameter4;
// so DSP kernels know when to re-compute coefficients
bool m_filterCoefficientsDirty;
// Set to true if any of the filter parameters are sample-accurate.
bool m_hasSampleAccurateValues;
};
} // namespace blink
#endif // BiquadProcessor_h
|
