1 /*
2 * Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "modules/audio_processing/agc2/agc2_testing_common.h"
12
13 #include <cmath>
14
15 #include "rtc_base/checks.h"
16
17 namespace webrtc {
18 namespace test {
19
LinSpace(double l,double r,int num_points)20 std::vector<double> LinSpace(double l, double r, int num_points) {
21 RTC_CHECK_GE(num_points, 2);
22 std::vector<double> points(num_points);
23 const double step = (r - l) / (num_points - 1.0);
24 points[0] = l;
25 for (int i = 1; i < num_points - 1; i++) {
26 points[i] = static_cast<double>(l) + i * step;
27 }
28 points[num_points - 1] = r;
29 return points;
30 }
31
WhiteNoiseGenerator(int min_amplitude,int max_amplitude)32 WhiteNoiseGenerator::WhiteNoiseGenerator(int min_amplitude, int max_amplitude)
33 : rand_gen_(42),
34 min_amplitude_(min_amplitude),
35 max_amplitude_(max_amplitude) {
36 RTC_DCHECK_LT(min_amplitude_, max_amplitude_);
37 RTC_DCHECK_LE(kMinS16, min_amplitude_);
38 RTC_DCHECK_LE(min_amplitude_, kMaxS16);
39 RTC_DCHECK_LE(kMinS16, max_amplitude_);
40 RTC_DCHECK_LE(max_amplitude_, kMaxS16);
41 }
42
operator ()()43 float WhiteNoiseGenerator::operator()() {
44 return static_cast<float>(rand_gen_.Rand(min_amplitude_, max_amplitude_));
45 }
46
SineGenerator(float amplitude,float frequency_hz,int sample_rate_hz)47 SineGenerator::SineGenerator(float amplitude,
48 float frequency_hz,
49 int sample_rate_hz)
50 : amplitude_(amplitude),
51 frequency_hz_(frequency_hz),
52 sample_rate_hz_(sample_rate_hz),
53 x_radians_(0.0f) {
54 RTC_DCHECK_GT(amplitude_, 0);
55 RTC_DCHECK_LE(amplitude_, kMaxS16);
56 }
57
operator ()()58 float SineGenerator::operator()() {
59 constexpr float kPi = 3.1415926536f;
60 x_radians_ += frequency_hz_ / sample_rate_hz_ * 2 * kPi;
61 if (x_radians_ >= 2 * kPi) {
62 x_radians_ -= 2 * kPi;
63 }
64 return amplitude_ * std::sinf(x_radians_);
65 }
66
PulseGenerator(float pulse_amplitude,float no_pulse_amplitude,float frequency_hz,int sample_rate_hz)67 PulseGenerator::PulseGenerator(float pulse_amplitude,
68 float no_pulse_amplitude,
69 float frequency_hz,
70 int sample_rate_hz)
71 : pulse_amplitude_(pulse_amplitude),
72 no_pulse_amplitude_(no_pulse_amplitude),
73 samples_period_(
74 static_cast<int>(static_cast<float>(sample_rate_hz) / frequency_hz)),
75 sample_counter_(0) {
76 RTC_DCHECK_GE(pulse_amplitude_, kMinS16);
77 RTC_DCHECK_LE(pulse_amplitude_, kMaxS16);
78 RTC_DCHECK_GT(no_pulse_amplitude_, kMinS16);
79 RTC_DCHECK_LE(no_pulse_amplitude_, kMaxS16);
80 RTC_DCHECK_GT(sample_rate_hz, frequency_hz);
81 }
82
operator ()()83 float PulseGenerator::operator()() {
84 sample_counter_++;
85 if (sample_counter_ >= samples_period_) {
86 sample_counter_ -= samples_period_;
87 }
88 return static_cast<float>(sample_counter_ == 0 ? pulse_amplitude_
89 : no_pulse_amplitude_);
90 }
91
92 } // namespace test
93 } // namespace webrtc
94