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/*
* Copyright (c) 2016 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/ns/noise_suppressor.h"
#include <cstddef>
#include <string>
#include "modules/audio_processing/audio_buffer.h"
#include "modules/audio_processing/ns/ns_config.h"
#include "rtc_base/strings/string_builder.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
std::string ProduceDebugText(int sample_rate_hz,
size_t num_channels,
NsConfig::SuppressionLevel level) {
StringBuilder ss;
ss << "Sample rate: " << sample_rate_hz << ", num_channels: " << num_channels
<< ", level: " << static_cast<int>(level);
return ss.Release();
}
void PopulateInputFrameWithIdenticalChannels(size_t num_channels,
size_t num_bands,
size_t frame_index,
AudioBuffer* audio) {
for (size_t ch = 0; ch < num_channels; ++ch) {
for (size_t b = 0; b < num_bands; ++b) {
for (size_t i = 0; i < 160; ++i) {
float value = static_cast<int>(frame_index * 160 + i);
audio->split_bands(ch)[b][i] = (value > 0 ? 5000 * b + value : 0);
}
}
}
}
void VerifyIdenticalChannels(size_t num_channels,
size_t num_bands,
size_t /* frame_index */,
const AudioBuffer& audio) {
EXPECT_GT(num_channels, 1u);
for (size_t ch = 1; ch < num_channels; ++ch) {
for (size_t b = 0; b < num_bands; ++b) {
for (size_t i = 0; i < 160; ++i) {
EXPECT_EQ(audio.split_bands_const(ch)[b][i],
audio.split_bands_const(0)[b][i]);
}
}
}
}
} // namespace
// Verifies that the same noise reduction effect is applied to all channels.
TEST(NoiseSuppressor, IdenticalChannelEffects) {
for (auto rate : {16000, 32000, 48000}) {
for (auto num_channels : {1, 4, 8}) {
for (auto level :
{NsConfig::SuppressionLevel::k6dB, NsConfig::SuppressionLevel::k12dB,
NsConfig::SuppressionLevel::k18dB,
NsConfig::SuppressionLevel::k21dB}) {
SCOPED_TRACE(ProduceDebugText(rate, num_channels, level));
const size_t num_bands = rate / 16000;
// const int frame_length = CheckedDivExact(rate, 100);
AudioBuffer audio(rate, num_channels, rate, num_channels, rate,
num_channels);
NsConfig cfg;
NoiseSuppressor ns(cfg, rate, num_channels);
for (size_t frame_index = 0; frame_index < 1000; ++frame_index) {
if (rate > 16000) {
audio.SplitIntoFrequencyBands();
}
PopulateInputFrameWithIdenticalChannels(num_channels, num_bands,
frame_index, &audio);
ns.Analyze(audio);
ns.Process(&audio);
if (num_channels > 1) {
VerifyIdenticalChannels(num_channels, num_bands, frame_index,
audio);
}
}
}
}
}
}
} // namespace webrtc
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