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/*
* Copyright (c) 2018 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/agc2/agc2_testing_common.h"
#include <math.h>
#include "rtc_base/checks.h"
namespace webrtc {
namespace test {
std::vector<double> LinSpace(double l, double r, int num_points) {
RTC_CHECK_GE(num_points, 2);
std::vector<double> points(num_points);
const double step = (r - l) / (num_points - 1.0);
points[0] = l;
for (int i = 1; i < num_points - 1; i++) {
points[i] = static_cast<double>(l) + i * step;
}
points[num_points - 1] = r;
return points;
}
WhiteNoiseGenerator::WhiteNoiseGenerator(int min_amplitude, int max_amplitude)
: rand_gen_(42),
min_amplitude_(min_amplitude),
max_amplitude_(max_amplitude) {
RTC_DCHECK_LT(min_amplitude_, max_amplitude_);
RTC_DCHECK_LE(kMinS16, min_amplitude_);
RTC_DCHECK_LE(min_amplitude_, kMaxS16);
RTC_DCHECK_LE(kMinS16, max_amplitude_);
RTC_DCHECK_LE(max_amplitude_, kMaxS16);
}
float WhiteNoiseGenerator::operator()() {
return static_cast<float>(rand_gen_.Rand(min_amplitude_, max_amplitude_));
}
SineGenerator::SineGenerator(float amplitude,
float frequency_hz,
int sample_rate_hz)
: amplitude_(amplitude),
frequency_hz_(frequency_hz),
sample_rate_hz_(sample_rate_hz),
x_radians_(0.0f) {
RTC_DCHECK_GT(amplitude_, 0);
RTC_DCHECK_LE(amplitude_, kMaxS16);
}
float SineGenerator::operator()() {
constexpr float kPi = 3.1415926536f;
x_radians_ += frequency_hz_ / sample_rate_hz_ * 2 * kPi;
if (x_radians_ >= 2 * kPi) {
x_radians_ -= 2 * kPi;
}
// Use sinf instead of std::sinf for libstdc++ compatibility.
return amplitude_ * sinf(x_radians_);
}
PulseGenerator::PulseGenerator(float pulse_amplitude,
float no_pulse_amplitude,
float frequency_hz,
int sample_rate_hz)
: pulse_amplitude_(pulse_amplitude),
no_pulse_amplitude_(no_pulse_amplitude),
samples_period_(
static_cast<int>(static_cast<float>(sample_rate_hz) / frequency_hz)),
sample_counter_(0) {
RTC_DCHECK_GE(pulse_amplitude_, kMinS16);
RTC_DCHECK_LE(pulse_amplitude_, kMaxS16);
RTC_DCHECK_GT(no_pulse_amplitude_, kMinS16);
RTC_DCHECK_LE(no_pulse_amplitude_, kMaxS16);
RTC_DCHECK_GT(sample_rate_hz, frequency_hz);
}
float PulseGenerator::operator()() {
sample_counter_++;
if (sample_counter_ >= samples_period_) {
sample_counter_ -= samples_period_;
}
return static_cast<float>(sample_counter_ == 0 ? pulse_amplitude_
: no_pulse_amplitude_);
}
} // namespace test
} // namespace webrtc