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
|
/*
* 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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.
*/
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "third_party/blink/renderer/platform/audio/audio_channel.h"
#include <math.h>
#include <algorithm>
#include "base/numerics/checked_math.h"
#include "third_party/blink/renderer/platform/audio/vector_math.h"
namespace blink {
void AudioChannel::ResizeSmaller(uint32_t new_length) {
DCHECK_LE(new_length, length_);
length_ = new_length;
}
void AudioChannel::Scale(float scale) {
if (IsSilent()) {
return;
}
vector_math::Vsmul(Data(), 1, &scale, MutableData(), 1, length());
}
void AudioChannel::CopyFrom(const AudioChannel* source_channel) {
DCHECK(source_channel);
DCHECK_GE(source_channel->length(), length());
if (source_channel->IsSilent()) {
Zero();
return;
}
memcpy(MutableData(), source_channel->Data(),
base::CheckMul(sizeof(float), length()).ValueOrDie());
}
void AudioChannel::CopyFromRange(const AudioChannel* source_channel,
unsigned start_frame,
unsigned end_frame) {
// Check that range is safe for reading from sourceChannel.
DCHECK(source_channel);
DCHECK_LT(start_frame, end_frame);
DCHECK_LE(end_frame, source_channel->length());
if (source_channel->IsSilent() && IsSilent()) {
return;
}
// Check that this channel has enough space.
size_t range_length = end_frame - start_frame;
DCHECK_LE(range_length, length());
const float* source = source_channel->Data();
float* destination = MutableData();
const size_t safe_length =
base::CheckMul(sizeof(float), range_length).ValueOrDie();
if (source_channel->IsSilent()) {
if (range_length == length()) {
Zero();
} else {
memset(destination, 0, safe_length);
}
} else {
memcpy(destination, source + start_frame, safe_length);
}
}
void AudioChannel::SumFrom(const AudioChannel* source_channel) {
DCHECK(source_channel);
DCHECK_GE(source_channel->length(), length());
if (source_channel->IsSilent()) {
return;
}
if (IsSilent()) {
CopyFrom(source_channel);
} else {
vector_math::Vadd(Data(), 1, source_channel->Data(), 1, MutableData(), 1,
length());
}
}
float AudioChannel::MaxAbsValue() const {
if (IsSilent()) {
return 0;
}
float max = 0;
vector_math::Vmaxmgv(Data(), 1, &max, length());
return max;
}
} // namespace blink
|
