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 #ifndef MODULES_AUDIO_PROCESSING_AGC2_AGC2_TESTING_COMMON_H_
12 #define MODULES_AUDIO_PROCESSING_AGC2_AGC2_TESTING_COMMON_H_
13 
14 #include <math.h>
15 
16 #include <limits>
17 #include <vector>
18 
19 #include "rtc_base/checks.h"
20 
21 namespace webrtc {
22 
23 namespace test {
24 
25 // Level Estimator test parameters.
26 constexpr float kDecayMs = 500.f;
27 
28 // Limiter parameters.
29 constexpr float kLimiterMaxInputLevelDbFs = 1.f;
30 constexpr float kLimiterKneeSmoothnessDb = 1.f;
31 constexpr float kLimiterCompressionRatio = 5.f;
32 constexpr float kPi = 3.1415926536f;
33 
34 std::vector<double> LinSpace(const double l, const double r, size_t num_points);
35 
36 class SineGenerator {
37  public:
SineGenerator(float frequency,int rate)38   SineGenerator(float frequency, int rate)
39       : frequency_(frequency), rate_(rate) {}
operator()40   float operator()() {
41     x_radians_ += frequency_ / rate_ * 2 * kPi;
42     if (x_radians_ > 2 * kPi) {
43       x_radians_ -= 2 * kPi;
44     }
45     return 1000.f * sinf(x_radians_);
46   }
47 
48  private:
49   float frequency_;
50   int rate_;
51   float x_radians_ = 0.f;
52 };
53 
54 class PulseGenerator {
55  public:
PulseGenerator(float frequency,int rate)56   PulseGenerator(float frequency, int rate)
57       : samples_period_(
58             static_cast<int>(static_cast<float>(rate) / frequency)) {
59     RTC_DCHECK_GT(rate, frequency);
60   }
operator()61   float operator()() {
62     sample_counter_++;
63     if (sample_counter_ >= samples_period_) {
64       sample_counter_ -= samples_period_;
65     }
66     return static_cast<float>(
67         sample_counter_ == 0 ? std::numeric_limits<int16_t>::max() : 10.f);
68   }
69 
70  private:
71   int samples_period_;
72   int sample_counter_ = 0;
73 };
74 
75 }  // namespace test
76 }  // namespace webrtc
77 
78 #endif  // MODULES_AUDIO_PROCESSING_AGC2_AGC2_TESTING_COMMON_H_
79