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/*
* Copyright (c) 2017 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/aec3/comfort_noise_generator.h"
#include <algorithm>
#include <numeric>
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/aec_state.h"
#include "rtc_base/random.h"
#include "rtc_base/system/arch.h"
#include "system_wrappers/include/cpu_features_wrapper.h"
#include "test/gtest.h"
namespace webrtc {
namespace aec3 {
namespace {
float Power(const FftData& N) {
std::array<float, kFftLengthBy2Plus1> N2;
N.Spectrum(Aec3Optimization::kNone, N2);
return std::accumulate(N2.begin(), N2.end(), 0.f) / N2.size();
}
} // namespace
TEST(ComfortNoiseGenerator, CorrectLevel) {
constexpr size_t kNumChannels = 5;
EchoCanceller3Config config;
ComfortNoiseGenerator cng(config, DetectOptimization(), kNumChannels);
AecState aec_state(config, kNumChannels);
std::vector<std::array<float, kFftLengthBy2Plus1>> N2(kNumChannels);
std::vector<FftData> n_lower(kNumChannels);
std::vector<FftData> n_upper(kNumChannels);
for (size_t ch = 0; ch < kNumChannels; ++ch) {
N2[ch].fill(1000.f * 1000.f / (ch + 1));
n_lower[ch].re.fill(0.f);
n_lower[ch].im.fill(0.f);
n_upper[ch].re.fill(0.f);
n_upper[ch].im.fill(0.f);
}
// Ensure instantaneous updata to nonzero noise.
cng.Compute(false, N2, n_lower, n_upper);
for (size_t ch = 0; ch < kNumChannels; ++ch) {
EXPECT_LT(0.f, Power(n_lower[ch]));
EXPECT_LT(0.f, Power(n_upper[ch]));
}
for (int k = 0; k < 10000; ++k) {
cng.Compute(false, N2, n_lower, n_upper);
}
for (size_t ch = 0; ch < kNumChannels; ++ch) {
EXPECT_NEAR(2.f * N2[ch][0], Power(n_lower[ch]), N2[ch][0] / 10.f);
EXPECT_NEAR(2.f * N2[ch][0], Power(n_upper[ch]), N2[ch][0] / 10.f);
}
}
} // namespace aec3
} // namespace webrtc
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