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/*
* Copyright (c) 2021 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/capture_levels_adjuster/capture_levels_adjuster.h"
#include <algorithm>
#include <tuple>
#include "modules/audio_processing/test/audio_buffer_tools.h"
#include "rtc_base/strings/string_builder.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
float SampleValueForChannel(int channel) {
constexpr float kSampleBaseValue = 100.f;
constexpr float kSampleChannelOffset = 1.f;
return kSampleBaseValue + channel * kSampleChannelOffset;
}
void PopulateBuffer(AudioBuffer& audio_buffer) {
for (size_t ch = 0; ch < audio_buffer.num_channels(); ++ch) {
test::FillBufferChannel(SampleValueForChannel(ch), ch, audio_buffer);
}
}
float ComputeExpectedSignalGainAfterApplyPreLevelAdjustment(
bool emulated_analog_mic_gain_enabled,
int emulated_analog_mic_gain_level,
float pre_gain) {
if (!emulated_analog_mic_gain_enabled) {
return pre_gain;
}
return pre_gain * std::min(emulated_analog_mic_gain_level, 255) / 255.f;
}
float ComputeExpectedSignalGainAfterApplyPostLevelAdjustment(
bool emulated_analog_mic_gain_enabled,
int emulated_analog_mic_gain_level,
float pre_gain,
float post_gain) {
return post_gain * ComputeExpectedSignalGainAfterApplyPreLevelAdjustment(
emulated_analog_mic_gain_enabled,
emulated_analog_mic_gain_level, pre_gain);
}
constexpr int kNumFramesToProcess = 10;
class CaptureLevelsAdjusterTest
: public ::testing::Test,
public ::testing::WithParamInterface<
std::tuple<int, int, bool, int, float, float>> {
protected:
int sample_rate_hz() const { return std::get<0>(GetParam()); }
int num_channels() const { return std::get<1>(GetParam()); }
bool emulated_analog_mic_gain_enabled() const {
return std::get<2>(GetParam());
}
int emulated_analog_mic_gain_level() const { return std::get<3>(GetParam()); }
float pre_gain() const { return std::get<4>(GetParam()); }
float post_gain() const { return std::get<5>(GetParam()); }
};
INSTANTIATE_TEST_SUITE_P(
CaptureLevelsAdjusterTestSuite,
CaptureLevelsAdjusterTest,
::testing::Combine(::testing::Values(16000, 32000, 48000),
::testing::Values(1, 2, 4),
::testing::Values(false, true),
::testing::Values(21, 255),
::testing::Values(0.1f, 1.f, 4.f),
::testing::Values(0.1f, 1.f, 4.f)));
TEST_P(CaptureLevelsAdjusterTest, InitialGainIsInstantlyAchieved) {
CaptureLevelsAdjuster adjuster(emulated_analog_mic_gain_enabled(),
emulated_analog_mic_gain_level(), pre_gain(),
post_gain());
AudioBuffer audio_buffer(sample_rate_hz(), num_channels(), sample_rate_hz(),
num_channels(), sample_rate_hz(), num_channels());
const float expected_signal_gain_after_pre_gain =
ComputeExpectedSignalGainAfterApplyPreLevelAdjustment(
emulated_analog_mic_gain_enabled(), emulated_analog_mic_gain_level(),
pre_gain());
const float expected_signal_gain_after_post_level_adjustment =
ComputeExpectedSignalGainAfterApplyPostLevelAdjustment(
emulated_analog_mic_gain_enabled(), emulated_analog_mic_gain_level(),
pre_gain(), post_gain());
for (int frame = 0; frame < kNumFramesToProcess; ++frame) {
PopulateBuffer(audio_buffer);
adjuster.ApplyPreLevelAdjustment(audio_buffer);
EXPECT_FLOAT_EQ(adjuster.GetPreAdjustmentGain(),
expected_signal_gain_after_pre_gain);
for (int ch = 0; ch < num_channels(); ++ch) {
for (size_t i = 0; i < audio_buffer.num_frames(); ++i) {
EXPECT_FLOAT_EQ(
audio_buffer.channels_const()[ch][i],
expected_signal_gain_after_pre_gain * SampleValueForChannel(ch));
}
}
adjuster.ApplyPostLevelAdjustment(audio_buffer);
for (int ch = 0; ch < num_channels(); ++ch) {
for (size_t i = 0; i < audio_buffer.num_frames(); ++i) {
EXPECT_FLOAT_EQ(audio_buffer.channels_const()[ch][i],
expected_signal_gain_after_post_level_adjustment *
SampleValueForChannel(ch));
}
}
}
}
TEST_P(CaptureLevelsAdjusterTest, NewGainsAreAchieved) {
const int lower_emulated_analog_mic_gain_level =
emulated_analog_mic_gain_level();
const float lower_pre_gain = pre_gain();
const float lower_post_gain = post_gain();
const int higher_emulated_analog_mic_gain_level =
std::min(lower_emulated_analog_mic_gain_level * 2, 255);
const float higher_pre_gain = lower_pre_gain * 2.f;
const float higher_post_gain = lower_post_gain * 2.f;
CaptureLevelsAdjuster adjuster(emulated_analog_mic_gain_enabled(),
lower_emulated_analog_mic_gain_level,
lower_pre_gain, lower_post_gain);
AudioBuffer audio_buffer(sample_rate_hz(), num_channels(), sample_rate_hz(),
num_channels(), sample_rate_hz(), num_channels());
const float expected_signal_gain_after_pre_gain =
ComputeExpectedSignalGainAfterApplyPreLevelAdjustment(
emulated_analog_mic_gain_enabled(),
higher_emulated_analog_mic_gain_level, higher_pre_gain);
const float expected_signal_gain_after_post_level_adjustment =
ComputeExpectedSignalGainAfterApplyPostLevelAdjustment(
emulated_analog_mic_gain_enabled(),
higher_emulated_analog_mic_gain_level, higher_pre_gain,
higher_post_gain);
adjuster.SetPreGain(higher_pre_gain);
adjuster.SetPostGain(higher_post_gain);
adjuster.SetAnalogMicGainLevel(higher_emulated_analog_mic_gain_level);
PopulateBuffer(audio_buffer);
adjuster.ApplyPreLevelAdjustment(audio_buffer);
adjuster.ApplyPostLevelAdjustment(audio_buffer);
EXPECT_EQ(adjuster.GetAnalogMicGainLevel(),
higher_emulated_analog_mic_gain_level);
for (int frame = 1; frame < kNumFramesToProcess; ++frame) {
PopulateBuffer(audio_buffer);
adjuster.ApplyPreLevelAdjustment(audio_buffer);
EXPECT_FLOAT_EQ(adjuster.GetPreAdjustmentGain(),
expected_signal_gain_after_pre_gain);
for (int ch = 0; ch < num_channels(); ++ch) {
for (size_t i = 0; i < audio_buffer.num_frames(); ++i) {
EXPECT_FLOAT_EQ(
audio_buffer.channels_const()[ch][i],
expected_signal_gain_after_pre_gain * SampleValueForChannel(ch));
}
}
adjuster.ApplyPostLevelAdjustment(audio_buffer);
for (int ch = 0; ch < num_channels(); ++ch) {
for (size_t i = 0; i < audio_buffer.num_frames(); ++i) {
EXPECT_FLOAT_EQ(audio_buffer.channels_const()[ch][i],
expected_signal_gain_after_post_level_adjustment *
SampleValueForChannel(ch));
}
}
EXPECT_EQ(adjuster.GetAnalogMicGainLevel(),
higher_emulated_analog_mic_gain_level);
}
}
} // namespace
} // namespace webrtc
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