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
|
/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/modules/audio_processing/beamformer/pcm_utils.h"
#include "webrtc/base/checks.h"
#include "webrtc/common_audio/include/audio_util.h"
#include "webrtc/modules/audio_processing/channel_buffer.h"
namespace webrtc {
size_t PcmRead(FILE* file,
size_t length,
int num_channels,
int16_t* const* buffer) {
CHECK_GE(num_channels, 1);
scoped_ptr<int16_t[]> interleaved_buffer(new int16_t[length]);
size_t elements_read = fread(interleaved_buffer.get(), sizeof(int16_t),
length, file);
if (elements_read != length) {
// This is only an error if we haven't reached the end of the file.
CHECK_NE(0, feof(file));
}
Deinterleave(interleaved_buffer.get(),
static_cast<int>(elements_read) / num_channels,
num_channels,
buffer);
return elements_read;
}
size_t PcmReadToFloat(FILE* file,
size_t length,
int num_channels,
float* const* buffer) {
CHECK_GE(num_channels, 1);
int num_frames = static_cast<int>(length) / num_channels;
scoped_ptr<ChannelBuffer<int16_t> > deinterleaved_buffer(
new ChannelBuffer<int16_t>(num_frames, num_channels));
size_t elements_read =
PcmRead(file, length, num_channels, deinterleaved_buffer->channels());
for (int i = 0; i < num_channels; ++i) {
S16ToFloat(deinterleaved_buffer->channel(i), num_frames, buffer[i]);
}
return elements_read;
}
void PcmWrite(FILE* file,
size_t length,
int num_channels,
const int16_t* const* buffer) {
CHECK_GE(num_channels, 1);
scoped_ptr<int16_t[]> interleaved_buffer(new int16_t[length]);
Interleave(buffer,
static_cast<int>(length) / num_channels,
num_channels,
interleaved_buffer.get());
CHECK_EQ(length,
fwrite(interleaved_buffer.get(), sizeof(int16_t), length, file));
}
void PcmWriteFromFloat(FILE* file,
size_t length,
int num_channels,
const float* const* buffer) {
CHECK_GE(num_channels, 1);
int num_frames = static_cast<int>(length) / num_channels;
scoped_ptr<ChannelBuffer<int16_t> > deinterleaved_buffer(
new ChannelBuffer<int16_t>(num_frames, num_channels));
for (int i = 0; i < num_channels; ++i) {
FloatToS16(buffer[i], num_frames, deinterleaved_buffer->channel(i));
}
PcmWrite(file, length, num_channels, deinterleaved_buffer->channels());
}
} // namespace webrtc
|
