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) 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 "modules/audio_processing/transient/transient_suppressor.h"
#include <vector>
#include "absl/types/optional.h"
#include "modules/audio_processing/transient/common.h"
#include "modules/audio_processing/transient/transient_suppressor_impl.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
constexpr int kMono = 1;
// Returns the index of the first non-zero sample in `samples` or an unspecified
// value if no value is zero.
absl::optional<int> FindFirstNonZeroSample(const std::vector<float>& samples) {
for (size_t i = 0; i < samples.size(); ++i) {
if (samples[i] != 0.0f) {
return i;
}
}
return absl::nullopt;
}
} // namespace
class TransientSuppressorVadModeParametrization
: public ::testing::TestWithParam<TransientSuppressor::VadMode> {};
TEST_P(TransientSuppressorVadModeParametrization,
TypingDetectionLogicWorksAsExpectedForMono) {
TransientSuppressorImpl ts(GetParam(), ts::kSampleRate16kHz,
ts::kSampleRate16kHz, kMono);
// Each key-press enables detection.
EXPECT_FALSE(ts.detection_enabled_);
ts.UpdateKeypress(true);
EXPECT_TRUE(ts.detection_enabled_);
// It takes four seconds without any key-press to disable the detection
for (int time_ms = 0; time_ms < 3990; time_ms += ts::kChunkSizeMs) {
ts.UpdateKeypress(false);
EXPECT_TRUE(ts.detection_enabled_);
}
ts.UpdateKeypress(false);
EXPECT_FALSE(ts.detection_enabled_);
// Key-presses that are more than a second apart from each other don't enable
// suppression.
for (int i = 0; i < 100; ++i) {
EXPECT_FALSE(ts.suppression_enabled_);
ts.UpdateKeypress(true);
EXPECT_TRUE(ts.detection_enabled_);
EXPECT_FALSE(ts.suppression_enabled_);
for (int time_ms = 0; time_ms < 990; time_ms += ts::kChunkSizeMs) {
ts.UpdateKeypress(false);
EXPECT_TRUE(ts.detection_enabled_);
EXPECT_FALSE(ts.suppression_enabled_);
}
ts.UpdateKeypress(false);
}
// Two consecutive key-presses is enough to enable the suppression.
ts.UpdateKeypress(true);
EXPECT_FALSE(ts.suppression_enabled_);
ts.UpdateKeypress(true);
EXPECT_TRUE(ts.suppression_enabled_);
// Key-presses that are less than a second apart from each other don't disable
// detection nor suppression.
for (int i = 0; i < 100; ++i) {
for (int time_ms = 0; time_ms < 1000; time_ms += ts::kChunkSizeMs) {
ts.UpdateKeypress(false);
EXPECT_TRUE(ts.detection_enabled_);
EXPECT_TRUE(ts.suppression_enabled_);
}
ts.UpdateKeypress(true);
EXPECT_TRUE(ts.detection_enabled_);
EXPECT_TRUE(ts.suppression_enabled_);
}
// It takes four seconds without any key-press to disable the detection and
// suppression.
for (int time_ms = 0; time_ms < 3990; time_ms += ts::kChunkSizeMs) {
ts.UpdateKeypress(false);
EXPECT_TRUE(ts.detection_enabled_);
EXPECT_TRUE(ts.suppression_enabled_);
}
for (int time_ms = 0; time_ms < 1000; time_ms += ts::kChunkSizeMs) {
ts.UpdateKeypress(false);
EXPECT_FALSE(ts.detection_enabled_);
EXPECT_FALSE(ts.suppression_enabled_);
}
}
INSTANTIATE_TEST_SUITE_P(
TransientSuppressorImplTest,
TransientSuppressorVadModeParametrization,
::testing::Values(TransientSuppressor::VadMode::kDefault,
TransientSuppressor::VadMode::kRnnVad,
TransientSuppressor::VadMode::kNoVad));
class TransientSuppressorSampleRateParametrization
: public ::testing::TestWithParam<int> {};
// Checks that voice probability and processed audio data are temporally aligned
// after `Suppress()` is called.
TEST_P(TransientSuppressorSampleRateParametrization,
CheckAudioAndVoiceProbabilityTemporallyAligned) {
const int sample_rate_hz = GetParam();
TransientSuppressorImpl ts(TransientSuppressor::VadMode::kDefault,
sample_rate_hz,
/*detection_rate_hz=*/sample_rate_hz, kMono);
const int frame_size = sample_rate_hz * ts::kChunkSizeMs / 1000;
std::vector<float> frame(frame_size);
constexpr int kMaxAttempts = 3;
for (int i = 0; i < kMaxAttempts; ++i) {
SCOPED_TRACE(i);
// Call `Suppress()` on frames of non-zero audio samples.
std::fill(frame.begin(), frame.end(), 1000.0f);
float delayed_voice_probability = ts.Suppress(
frame.data(), frame.size(), kMono, /*detection_data=*/nullptr,
/*detection_length=*/frame_size, /*reference_data=*/nullptr,
/*reference_length=*/frame_size, /*voice_probability=*/1.0f,
/*key_pressed=*/false);
// Detect the algorithmic delay of `TransientSuppressorImpl`.
absl::optional<int> frame_delay = FindFirstNonZeroSample(frame);
// Check that the delayed voice probability is delayed according to the
// measured delay.
if (frame_delay.has_value()) {
if (*frame_delay == 0) {
// When the delay is a multiple integer of the frame duration,
// `Suppress()` returns a copy of a previously observed voice
// probability value.
EXPECT_EQ(delayed_voice_probability, 1.0f);
} else {
// Instead, when the delay is fractional, `Suppress()` returns an
// interpolated value. Since the exact value depends on the
// interpolation method, we only check that the delayed voice
// probability is not zero as it must converge towards the previoulsy
// observed value.
EXPECT_GT(delayed_voice_probability, 0.0f);
}
break;
} else {
// The algorithmic delay is longer than the duration of a single frame.
// Until the delay is detected, the delayed voice probability is zero.
EXPECT_EQ(delayed_voice_probability, 0.0f);
}
}
}
INSTANTIATE_TEST_SUITE_P(TransientSuppressorImplTest,
TransientSuppressorSampleRateParametrization,
::testing::Values(ts::kSampleRate8kHz,
ts::kSampleRate16kHz,
ts::kSampleRate32kHz,
ts::kSampleRate48kHz));
} // namespace webrtc
|
