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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/*
* 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.
*/
#pragma once
#include "AudioArray.h"
#include "AudioBus.h"
#include "NoiseInjectionPolicy.h"
#include <JavaScriptCore/Forward.h>
#include <memory>
#include <wtf/Forward.h>
#include <wtf/Noncopyable.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class FFTFrame;
class RealtimeAnalyser {
WTF_MAKE_TZONE_ALLOCATED(RealtimeAnalyser);
WTF_MAKE_NONCOPYABLE(RealtimeAnalyser);
public:
explicit RealtimeAnalyser(OptionSet<NoiseInjectionPolicy>);
virtual ~RealtimeAnalyser();
size_t fftSize() const { return m_fftSize; }
bool setFftSize(size_t);
unsigned frequencyBinCount() const { return m_fftSize / 2; }
void setMinDecibels(double k) { m_minDecibels = k; }
double minDecibels() const { return m_minDecibels; }
void setMaxDecibels(double k) { m_maxDecibels = k; }
double maxDecibels() const { return m_maxDecibels; }
void setSmoothingTimeConstant(double k) { m_smoothingTimeConstant = k; }
double smoothingTimeConstant() const { return m_smoothingTimeConstant; }
void getFloatFrequencyData(JSC::Float32Array&);
void getByteFrequencyData(JSC::Uint8Array&);
void getFloatTimeDomainData(JSC::Float32Array&);
void getByteTimeDomainData(JSC::Uint8Array&);
// The audio thread writes input data here.
void writeInput(AudioBus*, size_t framesToProcess);
static constexpr double DefaultSmoothingTimeConstant { 0.8 };
static constexpr double DefaultMinDecibels { -100 };
static constexpr double DefaultMaxDecibels { -30 };
// All FFT implementations are expected to handle power-of-two sizes MinFFTSize <= size <= MaxFFTSize.
static constexpr unsigned DefaultFFTSize { 2048 };
static constexpr unsigned MinFFTSize { 32 };
static constexpr unsigned MaxFFTSize { 32768 };
static constexpr unsigned InputBufferSize { MaxFFTSize * 2 };
private:
// The audio thread writes the input audio here.
AudioFloatArray m_inputBuffer;
unsigned m_writeIndex { 0 };
// AudioBus used for downmixing input audio before copying it to m_inputBuffer.
RefPtr<AudioBus> m_downmixBus;
size_t m_fftSize { DefaultFFTSize };
std::unique_ptr<FFTFrame> m_analysisFrame;
void doFFTAnalysisIfNecessary();
// doFFTAnalysisIfNecessary() stores the floating-point magnitude analysis data here.
AudioFloatArray m_magnitudeBuffer { DefaultFFTSize / 2 };
AudioFloatArray& magnitudeBuffer() { return m_magnitudeBuffer; }
// A value between 0 and 1 which averages the previous version of m_magnitudeBuffer with the current analysis magnitude data.
double m_smoothingTimeConstant { DefaultSmoothingTimeConstant };
// The range used when converting when using getByteFrequencyData().
double m_minDecibels { DefaultMinDecibels };
double m_maxDecibels { DefaultMaxDecibels };
// We should only do the FFT analysis once per render quantum.
bool m_shouldDoFFTAnalysis { true };
OptionSet<NoiseInjectionPolicy> m_noiseInjectionPolicies;
};
} // namespace WebCore
|
