blob: f127d4abdef16145d8959083c84ce4efe1dfcef3 (
plain)
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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* Copyright (c) 2011 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 "level_estimator_impl.h"
#include <assert.h>
#include <math.h>
#include <string.h>
#include "audio_processing_impl.h"
#include "audio_buffer.h"
#include "critical_section_wrapper.h"
namespace webrtc {
namespace {
const double kMaxSquaredLevel = 32768.0 * 32768.0;
class Level {
public:
static const int kMinLevel = 127;
Level()
: sum_square_(0.0),
sample_count_(0) {}
~Level() {}
void Init() {
sum_square_ = 0.0;
sample_count_ = 0;
}
void Process(int16_t* data, int length) {
assert(data != NULL);
assert(length > 0);
sum_square_ += SumSquare(data, length);
sample_count_ += length;
}
void ProcessMuted(int length) {
assert(length > 0);
sample_count_ += length;
}
int RMS() {
if (sample_count_ == 0 || sum_square_ == 0.0) {
Init();
return kMinLevel;
}
// Normalize by the max level.
double rms = sum_square_ / (sample_count_ * kMaxSquaredLevel);
// 20log_10(x^0.5) = 10log_10(x)
rms = 10 * log10(rms);
if (rms > 0)
rms = 0;
else if (rms < -kMinLevel)
rms = -kMinLevel;
rms = -rms;
Init();
return static_cast<int>(rms + 0.5);
}
private:
static double SumSquare(int16_t* data, int length) {
double sum_square = 0.0;
for (int i = 0; i < length; ++i) {
double data_d = static_cast<double>(data[i]);
sum_square += data_d * data_d;
}
return sum_square;
}
double sum_square_;
int sample_count_;
};
} // namespace
LevelEstimatorImpl::LevelEstimatorImpl(const AudioProcessingImpl* apm)
: ProcessingComponent(apm),
apm_(apm) {}
LevelEstimatorImpl::~LevelEstimatorImpl() {}
int LevelEstimatorImpl::ProcessStream(AudioBuffer* audio) {
if (!is_component_enabled()) {
return apm_->kNoError;
}
Level* level = static_cast<Level*>(handle(0));
if (audio->is_muted()) {
level->ProcessMuted(audio->samples_per_channel());
return apm_->kNoError;
}
int16_t* mixed_data = audio->data(0);
if (audio->num_channels() > 1) {
audio->CopyAndMix(1);
mixed_data = audio->mixed_data(0);
}
level->Process(mixed_data, audio->samples_per_channel());
return apm_->kNoError;
}
int LevelEstimatorImpl::Enable(bool enable) {
CriticalSectionScoped crit_scoped(*apm_->crit());
return EnableComponent(enable);
}
bool LevelEstimatorImpl::is_enabled() const {
return is_component_enabled();
}
int LevelEstimatorImpl::RMS() {
if (!is_component_enabled()) {
return apm_->kNotEnabledError;
}
Level* level = static_cast<Level*>(handle(0));
return level->RMS();
}
int LevelEstimatorImpl::get_version(char* version,
int version_len_bytes) const {
// An empty string is used to indicate no version information.
memset(version, 0, version_len_bytes);
return apm_->kNoError;
}
void* LevelEstimatorImpl::CreateHandle() const {
return new Level;
}
int LevelEstimatorImpl::DestroyHandle(void* handle) const {
assert(handle != NULL);
Level* level = static_cast<Level*>(handle);
delete level;
return apm_->kNoError;
}
int LevelEstimatorImpl::InitializeHandle(void* handle) const {
assert(handle != NULL);
Level* level = static_cast<Level*>(handle);
level->Init();
return apm_->kNoError;
}
int LevelEstimatorImpl::ConfigureHandle(void* /*handle*/) const {
return apm_->kNoError;
}
int LevelEstimatorImpl::num_handles_required() const {
return 1;
}
int LevelEstimatorImpl::GetHandleError(void* handle) const {
// The component has no detailed errors.
assert(handle != NULL);
return apm_->kUnspecifiedError;
}
} // namespace webrtc
|
