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
173
174
175
|
/*
* Copyright (c) 2012 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/noise_suppression_impl.h"
#include "webrtc/modules/audio_processing/audio_buffer.h"
#if defined(WEBRTC_NS_FLOAT)
#include "webrtc/modules/audio_processing/ns/noise_suppression.h"
#define NS_CREATE WebRtcNs_Create
#define NS_FREE WebRtcNs_Free
#define NS_INIT WebRtcNs_Init
#define NS_SET_POLICY WebRtcNs_set_policy
typedef NsHandle NsState;
#elif defined(WEBRTC_NS_FIXED)
#include "webrtc/modules/audio_processing/ns/noise_suppression_x.h"
#define NS_CREATE WebRtcNsx_Create
#define NS_FREE WebRtcNsx_Free
#define NS_INIT WebRtcNsx_Init
#define NS_SET_POLICY WebRtcNsx_set_policy
typedef NsxHandle NsState;
#endif
namespace webrtc {
class NoiseSuppressionImpl::Suppressor {
public:
explicit Suppressor(int sample_rate_hz) {
state_ = NS_CREATE();
RTC_CHECK(state_);
int error = NS_INIT(state_, sample_rate_hz);
RTC_DCHECK_EQ(0, error);
}
~Suppressor() {
NS_FREE(state_);
}
NsState* state() { return state_; }
private:
NsState* state_ = nullptr;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Suppressor);
};
NoiseSuppressionImpl::NoiseSuppressionImpl(rtc::CriticalSection* crit)
: crit_(crit) {
RTC_DCHECK(crit);
}
NoiseSuppressionImpl::~NoiseSuppressionImpl() {}
void NoiseSuppressionImpl::Initialize(size_t channels, int sample_rate_hz) {
rtc::CritScope cs(crit_);
channels_ = channels;
sample_rate_hz_ = sample_rate_hz;
std::vector<rtc::scoped_ptr<Suppressor>> new_suppressors;
if (enabled_) {
new_suppressors.resize(channels);
for (size_t i = 0; i < channels; i++) {
new_suppressors[i].reset(new Suppressor(sample_rate_hz));
}
}
suppressors_.swap(new_suppressors);
set_level(level_);
}
void NoiseSuppressionImpl::AnalyzeCaptureAudio(AudioBuffer* audio) {
RTC_DCHECK(audio);
#if defined(WEBRTC_NS_FLOAT)
rtc::CritScope cs(crit_);
if (!enabled_) {
return;
}
RTC_DCHECK_GE(160u, audio->num_frames_per_band());
RTC_DCHECK_EQ(suppressors_.size(), audio->num_channels());
for (size_t i = 0; i < suppressors_.size(); i++) {
WebRtcNs_Analyze(suppressors_[i]->state(),
audio->split_bands_const_f(i)[kBand0To8kHz]);
}
#endif
}
void NoiseSuppressionImpl::ProcessCaptureAudio(AudioBuffer* audio) {
RTC_DCHECK(audio);
rtc::CritScope cs(crit_);
if (!enabled_) {
return;
}
RTC_DCHECK_GE(160u, audio->num_frames_per_band());
RTC_DCHECK_EQ(suppressors_.size(), audio->num_channels());
for (size_t i = 0; i < suppressors_.size(); i++) {
#if defined(WEBRTC_NS_FLOAT)
WebRtcNs_Process(suppressors_[i]->state(),
audio->split_bands_const_f(i),
audio->num_bands(),
audio->split_bands_f(i));
#elif defined(WEBRTC_NS_FIXED)
WebRtcNsx_Process(suppressors_[i]->state(),
audio->split_bands_const(i),
audio->num_bands(),
audio->split_bands(i));
#endif
}
}
int NoiseSuppressionImpl::Enable(bool enable) {
rtc::CritScope cs(crit_);
if (enabled_ != enable) {
enabled_ = enable;
Initialize(channels_, sample_rate_hz_);
}
return AudioProcessing::kNoError;
}
bool NoiseSuppressionImpl::is_enabled() const {
rtc::CritScope cs(crit_);
return enabled_;
}
int NoiseSuppressionImpl::set_level(Level level) {
int policy = 1;
switch (level) {
case NoiseSuppression::kLow:
policy = 0;
break;
case NoiseSuppression::kModerate:
policy = 1;
break;
case NoiseSuppression::kHigh:
policy = 2;
break;
case NoiseSuppression::kVeryHigh:
policy = 3;
break;
default:
RTC_NOTREACHED();
}
rtc::CritScope cs(crit_);
level_ = level;
for (auto& suppressor : suppressors_) {
int error = NS_SET_POLICY(suppressor->state(), policy);
RTC_DCHECK_EQ(0, error);
}
return AudioProcessing::kNoError;
}
NoiseSuppression::Level NoiseSuppressionImpl::level() const {
rtc::CritScope cs(crit_);
return level_;
}
float NoiseSuppressionImpl::speech_probability() const {
rtc::CritScope cs(crit_);
#if defined(WEBRTC_NS_FLOAT)
float probability_average = 0.0f;
for (auto& suppressor : suppressors_) {
probability_average +=
WebRtcNs_prior_speech_probability(suppressor->state());
}
if (!suppressors_.empty()) {
probability_average /= suppressors_.size();
}
return probability_average;
#elif defined(WEBRTC_NS_FIXED)
// TODO(peah): Returning error code as a float! Remove this.
// Currently not available for the fixed point implementation.
return AudioProcessing::kUnsupportedFunctionError;
#endif
}
} // namespace webrtc
|
