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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/*
* Copyright 2014 The Chromium Authors. All rights reserved.
* Copyright (C) 2020 Apple 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.
*/
#include "config.h"
#include "StereoPanner.h"
#if ENABLE(WEB_AUDIO)
#include "SharedBuffer.h"
#include "VectorMath.h"
#include <wtf/MathExtras.h>
namespace WebCore {
namespace StereoPanner {
void panWithSampleAccurateValues(const AudioBus* inputBus, AudioBus* outputBus, const float* panValues, size_t framesToProcess)
{
bool isInputSafe = inputBus && (inputBus->numberOfChannels() == 1 || inputBus->numberOfChannels() == 2) && framesToProcess <= inputBus->length();
ASSERT(isInputSafe);
if (!isInputSafe)
return;
unsigned numberOfInputChannels = inputBus->numberOfChannels();
bool isOutputSafe = outputBus && outputBus->numberOfChannels() == 2 && framesToProcess <= outputBus->length();
ASSERT(isOutputSafe);
if (!isOutputSafe)
return;
const float* sourceL = inputBus->channel(0)->data();
const float* sourceR = numberOfInputChannels > 1 ? inputBus->channel(1)->data() : sourceL;
float* destinationL = outputBus->channelByType(AudioBus::ChannelLeft)->mutableData();
float* destinationR = outputBus->channelByType(AudioBus::ChannelRight)->mutableData();
if (!sourceL || !sourceR || !destinationL || !destinationR)
return;
double gainL;
double gainR;
double panRadian;
int n = framesToProcess;
// Handles mono source case first, then stereo source case.
if (numberOfInputChannels == 1) {
while (n--) {
float inputL = *sourceL++;
double pan = clampTo(*panValues++, -1.0, 1.0);
// Pan from left to right [-1; 1] will be normalized as [0; 1].
panRadian = (pan * 0.5 + 0.5) * piOverTwoDouble;
gainL = cos(panRadian);
gainR = sin(panRadian);
*destinationL++ = static_cast<float>(inputL * gainL);
*destinationR++ = static_cast<float>(inputL * gainR);
}
} else {
while (n--) {
float inputL = *sourceL++;
float inputR = *sourceR++;
double pan = clampTo(*panValues++, -1.0, 1.0);
// Normalize [-1; 0] to [0; 1]. Do nothing when [0; 1].
panRadian = (pan <= 0 ? pan + 1 : pan) * piOverTwoDouble;
gainL = cos(panRadian);
gainR = sin(panRadian);
if (pan <= 0) {
*destinationL++ = static_cast<float>(inputL + inputR * gainL);
*destinationR++ = static_cast<float>(inputR * gainR);
} else {
*destinationL++ = static_cast<float>(inputL * gainL);
*destinationR++ = static_cast<float>(inputR + inputL * gainR);
}
}
}
}
void panToTargetValue(const AudioBus* inputBus, AudioBus* outputBus, float panValue, size_t framesToProcess)
{
bool isInputSafe = inputBus && (inputBus->numberOfChannels() == 1 || inputBus->numberOfChannels() == 2) && framesToProcess <= inputBus->length();
ASSERT(isInputSafe);
if (!isInputSafe)
return;
unsigned numberOfInputChannels = inputBus->numberOfChannels();
bool isOutputSafe = outputBus && outputBus->numberOfChannels() == 2 && framesToProcess <= outputBus->length();
ASSERT(isOutputSafe);
if (!isOutputSafe)
return;
const float* sourceL = inputBus->channel(0)->data();
const float* sourceR = numberOfInputChannels > 1 ? inputBus->channel(1)->data() : sourceL;
float* destinationL = outputBus->channelByType(AudioBus::ChannelLeft)->mutableData();
float* destinationR = outputBus->channelByType(AudioBus::ChannelRight)->mutableData();
if (!sourceL || !sourceR || !destinationL || !destinationR)
return;
float targetPan = clampTo(panValue, -1.0, 1.0);
if (numberOfInputChannels == 1) {
double panRadian = (targetPan * 0.5 + 0.5) * piOverTwoDouble;
double gainL = cos(panRadian);
double gainR = sin(panRadian);
VectorMath::multiplyByScalar(sourceL, gainL, destinationL, framesToProcess);
VectorMath::multiplyByScalar(sourceL, gainR, destinationR, framesToProcess);
} else {
double panRadian = (targetPan <= 0 ? targetPan + 1 : targetPan) * piOverTwoDouble;
double gainL = cos(panRadian);
double gainR = sin(panRadian);
if (targetPan <= 0) {
VectorMath::multiplyByScalarThenAddToVector(sourceR, gainL, sourceL, destinationL, framesToProcess);
VectorMath::multiplyByScalar(sourceR, gainR, destinationR, framesToProcess);
} else {
VectorMath::multiplyByScalar(sourceL, gainL, destinationL, framesToProcess);
VectorMath::multiplyByScalarThenAddToVector(sourceL, gainR, sourceR, destinationR, framesToProcess);
}
}
}
} // namespace StereoPanner
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
|
