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
|
/*
* Copyright (C) 2012, 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 "AudioScheduledSourceNode.h"
#include "OscillatorOptions.h"
#include "OscillatorType.h"
#include <wtf/Lock.h>
namespace WebCore {
class PeriodicWave;
// OscillatorNode is an audio generator of periodic waveforms.
class OscillatorNode final : public AudioScheduledSourceNode {
WTF_MAKE_ISO_ALLOCATED(OscillatorNode);
public:
static ExceptionOr<Ref<OscillatorNode>> create(BaseAudioContext&, const OscillatorOptions& = { });
virtual ~OscillatorNode();
const char* activeDOMObjectName() const final { return "OscillatorNode"; }
OscillatorType typeForBindings() const { ASSERT(isMainThread()); return m_type; }
ExceptionOr<void> setTypeForBindings(OscillatorType);
AudioParam* frequency() { return m_frequency.get(); }
AudioParam* detune() { return m_detune.get(); }
void setPeriodicWave(PeriodicWave&);
private:
OscillatorNode(BaseAudioContext&, const OscillatorOptions& = { });
void process(size_t framesToProcess) final;
double tailTime() const final { return 0; }
double latencyTime() const final { return 0; }
// Returns true if there are sample-accurate timeline parameter changes.
bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess) WTF_REQUIRES_LOCK(m_processLock);
double processARate(int, float* destP, double virtualReadIndex, float* phaseIncrements) WTF_REQUIRES_LOCK(m_processLock);
double processKRate(int, float* destP, double virtualReadIndex) WTF_REQUIRES_LOCK(m_processLock);
bool propagatesSilence() const final;
// One of the waveform types defined in the enum.
OscillatorType m_type; // Only used on the main thread.
// Frequency value in Hertz.
RefPtr<AudioParam> m_frequency;
// Detune value (deviating from the frequency) in Cents.
RefPtr<AudioParam> m_detune;
bool m_firstRender { true };
// m_virtualReadIndex is a sample-frame index into our buffer representing the current playback position.
// Since it's floating-point, it has sub-sample accuracy.
double m_virtualReadIndex { 0 };
// This synchronizes process().
mutable Lock m_processLock;
// Stores sample-accurate values calculated according to frequency and detune.
AudioFloatArray m_phaseIncrements;
AudioFloatArray m_detuneValues;
RefPtr<PeriodicWave> m_periodicWave WTF_GUARDED_BY_LOCK(m_processLock);
};
String convertEnumerationToString(OscillatorType); // In JSOscillatorNode.cpp
} // namespace WebCore
namespace WTF {
template<> struct LogArgument<WebCore::OscillatorType> {
static String toString(WebCore::OscillatorType type) { return convertEnumerationToString(type); }
};
} // namespace WTF
|
