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
|
/*
* 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/reverb_accumulation_buffer.h"
#include <algorithm>
#include "third_party/blink/renderer/platform/audio/vector_math.h"
namespace blink {
ReverbAccumulationBuffer::ReverbAccumulationBuffer(uint32_t length)
: buffer_(length), read_index_(0), read_time_frame_(0) {}
void ReverbAccumulationBuffer::ReadAndClear(float* destination,
uint32_t number_of_frames) {
uint32_t buffer_length = buffer_.size();
DCHECK_LE(read_index_, buffer_length);
DCHECK_LE(number_of_frames, buffer_length);
uint32_t frames_available = buffer_length - read_index_;
uint32_t number_of_frames1 = std::min(number_of_frames, frames_available);
uint32_t number_of_frames2 = number_of_frames - number_of_frames1;
float* source = buffer_.Data();
memcpy(destination, source + read_index_, sizeof(float) * number_of_frames1);
memset(source + read_index_, 0, sizeof(float) * number_of_frames1);
// Handle wrap-around if necessary
if (number_of_frames2 > 0) {
memcpy(destination + number_of_frames1, source,
sizeof(float) * number_of_frames2);
memset(source, 0, sizeof(float) * number_of_frames2);
}
read_index_ = (read_index_ + number_of_frames) % buffer_length;
read_time_frame_ += number_of_frames;
}
void ReverbAccumulationBuffer::UpdateReadIndex(
uint32_t* read_index,
uint32_t number_of_frames) const {
// Update caller's readIndex
*read_index = (*read_index + number_of_frames) % buffer_.size();
}
uint32_t ReverbAccumulationBuffer::Accumulate(float* source,
uint32_t number_of_frames,
uint32_t* read_index,
size_t delay_frames) {
uint32_t buffer_length = buffer_.size();
uint32_t write_index = (*read_index + delay_frames) % buffer_length;
// Update caller's readIndex
*read_index = (*read_index + number_of_frames) % buffer_length;
uint32_t frames_available = buffer_length - write_index;
uint32_t number_of_frames1 = std::min(number_of_frames, frames_available);
uint32_t number_of_frames2 = number_of_frames - number_of_frames1;
float* destination = buffer_.Data();
DCHECK_LE(write_index, buffer_length);
DCHECK_LE(number_of_frames1 + write_index, buffer_length);
DCHECK_LE(number_of_frames2, buffer_length);
vector_math::Vadd(source, 1, destination + write_index, 1,
destination + write_index, 1, number_of_frames1);
// Handle wrap-around if necessary
if (number_of_frames2 > 0) {
vector_math::Vadd(source + number_of_frames1, 1, destination, 1,
destination, 1, number_of_frames2);
}
return write_index;
}
void ReverbAccumulationBuffer::Reset() {
buffer_.Zero();
read_index_ = 0;
read_time_frame_ = 0;
}
} // namespace blink
|
