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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/vad_wrapper.h"
#include <limits>
#include <memory>
#include <tuple>
#include <utility>
#include <vector>
#include "modules/audio_processing/agc2/agc2_common.h"
#include "modules/audio_processing/include/audio_frame_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/gunit.h"
#include "rtc_base/numerics/safe_compare.h"
#include "test/gmock.h"
namespace webrtc {
namespace {
using ::testing::AnyNumber;
using ::testing::Return;
using ::testing::ReturnRoundRobin;
using ::testing::Truly;
constexpr int kNumFramesPerSecond = 100;
constexpr int kNoVadPeriodicReset =
kFrameDurationMs * (std::numeric_limits<int>::max() / kFrameDurationMs);
constexpr int kSampleRate8kHz = 8000;
class MockVad : public VoiceActivityDetectorWrapper::MonoVad {
public:
MOCK_METHOD(int, SampleRateHz, (), (const, override));
MOCK_METHOD(void, Reset, (), (override));
MOCK_METHOD(float, Analyze, (rtc::ArrayView<const float> frame), (override));
};
// Checks that the ctor and `Initialize()` read the sample rate of the wrapped
// VAD.
TEST(GainController2VoiceActivityDetectorWrapper, CtorAndInitReadSampleRate) {
auto vad = std::make_unique<MockVad>();
EXPECT_CALL(*vad, SampleRateHz)
.Times(2)
.WillRepeatedly(Return(kSampleRate8kHz));
EXPECT_CALL(*vad, Reset).Times(AnyNumber());
auto vad_wrapper = std::make_unique<VoiceActivityDetectorWrapper>(
kNoVadPeriodicReset, std::move(vad), kSampleRate8kHz);
}
// Creates a `VoiceActivityDetectorWrapper` injecting a mock VAD that
// repeatedly returns the next value from `speech_probabilities` and that
// restarts from the beginning when after the last element is returned.
std::unique_ptr<VoiceActivityDetectorWrapper> CreateMockVadWrapper(
int vad_reset_period_ms,
int sample_rate_hz,
const std::vector<float>& speech_probabilities,
int expected_vad_reset_calls) {
auto vad = std::make_unique<MockVad>();
EXPECT_CALL(*vad, SampleRateHz)
.Times(AnyNumber())
.WillRepeatedly(Return(sample_rate_hz));
if (expected_vad_reset_calls >= 0) {
EXPECT_CALL(*vad, Reset).Times(expected_vad_reset_calls);
}
EXPECT_CALL(*vad, Analyze)
.Times(AnyNumber())
.WillRepeatedly(ReturnRoundRobin(speech_probabilities));
return std::make_unique<VoiceActivityDetectorWrapper>(
vad_reset_period_ms, std::move(vad), kSampleRate8kHz);
}
// 10 ms mono frame.
struct FrameWithView {
// Ctor. Initializes the frame samples with `value`.
explicit FrameWithView(int sample_rate_hz)
: samples(rtc::CheckedDivExact(sample_rate_hz, kNumFramesPerSecond),
0.0f),
channel0(samples.data()),
view(&channel0, /*num_channels=*/1, samples.size()) {}
std::vector<float> samples;
const float* const channel0;
const AudioFrameView<const float> view;
};
// Checks that the expected speech probabilities are returned.
TEST(GainController2VoiceActivityDetectorWrapper, CheckSpeechProbabilities) {
const std::vector<float> speech_probabilities{0.709f, 0.484f, 0.882f, 0.167f,
0.44f, 0.525f, 0.858f, 0.314f,
0.653f, 0.965f, 0.413f, 0.0f};
auto vad_wrapper = CreateMockVadWrapper(kNoVadPeriodicReset, kSampleRate8kHz,
speech_probabilities,
/*expected_vad_reset_calls=*/1);
FrameWithView frame(kSampleRate8kHz);
for (int i = 0; rtc::SafeLt(i, speech_probabilities.size()); ++i) {
SCOPED_TRACE(i);
EXPECT_EQ(speech_probabilities[i], vad_wrapper->Analyze(frame.view));
}
}
// Checks that the VAD is not periodically reset.
TEST(GainController2VoiceActivityDetectorWrapper, VadNoPeriodicReset) {
constexpr int kNumFrames = 19;
auto vad_wrapper = CreateMockVadWrapper(kNoVadPeriodicReset, kSampleRate8kHz,
/*speech_probabilities=*/{1.0f},
/*expected_vad_reset_calls=*/1);
FrameWithView frame(kSampleRate8kHz);
for (int i = 0; i < kNumFrames; ++i) {
vad_wrapper->Analyze(frame.view);
}
}
class VadPeriodResetParametrization
: public ::testing::TestWithParam<std::tuple<int, int>> {
protected:
int num_frames() const { return std::get<0>(GetParam()); }
int vad_reset_period_frames() const { return std::get<1>(GetParam()); }
};
// Checks that the VAD is periodically reset with the expected period.
TEST_P(VadPeriodResetParametrization, VadPeriodicReset) {
auto vad_wrapper = CreateMockVadWrapper(
/*vad_reset_period_ms=*/vad_reset_period_frames() * kFrameDurationMs,
kSampleRate8kHz,
/*speech_probabilities=*/{1.0f},
/*expected_vad_reset_calls=*/1 +
num_frames() / vad_reset_period_frames());
FrameWithView frame(kSampleRate8kHz);
for (int i = 0; i < num_frames(); ++i) {
vad_wrapper->Analyze(frame.view);
}
}
INSTANTIATE_TEST_SUITE_P(GainController2VoiceActivityDetectorWrapper,
VadPeriodResetParametrization,
::testing::Combine(::testing::Values(1, 19, 123),
::testing::Values(2, 5, 20, 53)));
class VadResamplingParametrization
: public ::testing::TestWithParam<std::tuple<int, int>> {
protected:
int input_sample_rate_hz() const { return std::get<0>(GetParam()); }
int vad_sample_rate_hz() const { return std::get<1>(GetParam()); }
};
// Checks that regardless of the input audio sample rate, the wrapped VAD
// analyzes frames having the expected size, that is according to its internal
// sample rate.
TEST_P(VadResamplingParametrization, CheckResampledFrameSize) {
auto vad = std::make_unique<MockVad>();
EXPECT_CALL(*vad, SampleRateHz)
.Times(AnyNumber())
.WillRepeatedly(Return(vad_sample_rate_hz()));
EXPECT_CALL(*vad, Reset).Times(1);
EXPECT_CALL(*vad, Analyze(Truly([this](rtc::ArrayView<const float> frame) {
return rtc::SafeEq(frame.size(), rtc::CheckedDivExact(vad_sample_rate_hz(),
kNumFramesPerSecond));
}))).Times(1);
auto vad_wrapper = std::make_unique<VoiceActivityDetectorWrapper>(
kNoVadPeriodicReset, std::move(vad), input_sample_rate_hz());
FrameWithView frame(input_sample_rate_hz());
vad_wrapper->Analyze(frame.view);
}
INSTANTIATE_TEST_SUITE_P(
GainController2VoiceActivityDetectorWrapper,
VadResamplingParametrization,
::testing::Combine(::testing::Values(8000, 16000, 44100, 48000),
::testing::Values(6000, 8000, 12000, 16000, 24000)));
} // namespace
} // namespace webrtc
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