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/*
* Copyright (c) 2022 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/transient/voice_probability_delay_unit.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
// Checks that with zero delay, the observed value is immediately returned as
// delayed value.
TEST(VoiceProbabilityDelayUnit, NoDelay) {
VoiceProbabilityDelayUnit delay_unit(/*delay_num_samples=*/0,
/*sample_rate_hz=*/48000);
constexpr int kMax = 5;
for (int i = 0; i <= kMax; ++i) {
SCOPED_TRACE(i);
float voice_probability = static_cast<float>(i) / kMax;
EXPECT_EQ(voice_probability, delay_unit.Delay(voice_probability));
}
}
// Checks that with integer delays, an exact copy of a previously observed value
// is returned.
TEST(VoiceProbabilityDelayUnit, IntegerDelay) {
VoiceProbabilityDelayUnit delay_unit_10ms(/*delay_num_samples=*/480,
/*sample_rate_hz=*/48000);
delay_unit_10ms.Delay(0.125f);
EXPECT_EQ(0.125f, delay_unit_10ms.Delay(0.9f));
VoiceProbabilityDelayUnit delay_unit_20ms(/*delay_num_samples=*/960,
/*sample_rate_hz=*/48000);
delay_unit_20ms.Delay(0.125f);
delay_unit_20ms.Delay(0.8f);
EXPECT_EQ(0.125f, delay_unit_20ms.Delay(0.9f));
}
// Checks that with a fractional delay < 10 ms, interpolation is applied.
TEST(VoiceProbabilityDelayUnit, FractionalDelayLessThan10ms) {
// Create delay unit with fractional delay of 6 ms.
VoiceProbabilityDelayUnit delay_unit(/*delay_num_samples=*/288,
/*sample_rate_hz=*/48000);
// frame 0
// --------- frame 1
// ---------
// 0000001111
delay_unit.Delay(1.0f);
EXPECT_FLOAT_EQ(0.68f, delay_unit.Delay(0.2f));
}
// Checks that with a fractional delay > 10 ms, interpolation is applied.
TEST(VoiceProbabilityDelayUnit, FractionalDelayGreaterThan10ms) {
// Create delay unit with fractional delay of 14 ms.
VoiceProbabilityDelayUnit delay_unit(/*delay_num_samples=*/672,
/*sample_rate_hz=*/48000);
// frame 0
// --------- frame 1
// --------- frame 2
// ---------
// 0000111111
delay_unit.Delay(1.0f);
delay_unit.Delay(0.2f);
EXPECT_FLOAT_EQ(0.52f, delay_unit.Delay(1.0f));
}
// Checks that `Initialize()` resets the delay unit.
TEST(VoiceProbabilityDelayUnit, InitializeResetsDelayUnit) {
VoiceProbabilityDelayUnit delay_unit(/*delay_num_samples=*/960,
/*sample_rate_hz=*/48000);
delay_unit.Delay(1.0f);
delay_unit.Delay(0.9f);
delay_unit.Initialize(/*delay_num_samples=*/160, /*sample_rate_hz=*/8000);
EXPECT_EQ(0.0f, delay_unit.Delay(0.1f));
EXPECT_EQ(0.0f, delay_unit.Delay(0.2f));
EXPECT_EQ(0.1f, delay_unit.Delay(0.3f));
}
// Checks that `Initialize()` handles delay changes.
TEST(VoiceProbabilityDelayUnit, InitializeHandlesDelayChanges) {
// Start with a 20 ms delay.
VoiceProbabilityDelayUnit delay_unit(/*delay_num_samples=*/960,
/*sample_rate_hz=*/48000);
delay_unit.Delay(1.0f);
delay_unit.Delay(0.9f);
// Lower the delay to 10 ms.
delay_unit.Initialize(/*delay_num_samples=*/80, /*sample_rate_hz=*/8000);
EXPECT_EQ(0.0f, delay_unit.Delay(0.1f));
EXPECT_EQ(0.1f, delay_unit.Delay(0.2f));
// Increase the delay to 15 ms.
delay_unit.Initialize(/*delay_num_samples=*/120, /*sample_rate_hz=*/8000);
EXPECT_EQ(0.0f, delay_unit.Delay(0.1f));
EXPECT_EQ(0.05f, delay_unit.Delay(0.2f));
EXPECT_EQ(0.15f, delay_unit.Delay(0.3f));
}
} // namespace
} // namespace webrtc
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