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/*
* Copyright (c) 2014 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/audio_processing_impl.h"
#include <memory>
#include "absl/memory/memory.h"
#include "api/scoped_refptr.h"
#include "modules/audio_processing/include/audio_processing.h"
#include "modules/audio_processing/test/echo_control_mock.h"
#include "modules/audio_processing/test/test_utils.h"
#include "rtc_base/checks.h"
#include "rtc_base/ref_counted_object.h"
#include "test/gmock.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
using ::testing::Invoke;
using ::testing::NotNull;
class MockInitialize : public AudioProcessingImpl {
public:
explicit MockInitialize(const webrtc::Config& config)
: AudioProcessingImpl(config) {}
MOCK_METHOD0(InitializeLocked, int());
int RealInitializeLocked() RTC_NO_THREAD_SAFETY_ANALYSIS {
return AudioProcessingImpl::InitializeLocked();
}
MOCK_CONST_METHOD0(AddRef, void());
MOCK_CONST_METHOD0(Release, rtc::RefCountReleaseStatus());
};
// Creates MockEchoControl instances and provides a raw pointer access to
// the next created one. The raw pointer is meant to be used with gmock.
// Returning a pointer of the next created MockEchoControl instance is necessary
// for the following reasons: (i) gmock expectations must be set before any call
// occurs, (ii) APM is initialized the first time that
// AudioProcessingImpl::ProcessStream() is called and the initialization leads
// to the creation of a new EchoControl object.
class MockEchoControlFactory : public EchoControlFactory {
public:
MockEchoControlFactory() : next_mock_(absl::make_unique<MockEchoControl>()) {}
// Returns a pointer to the next MockEchoControl that this factory creates.
MockEchoControl* GetNext() const { return next_mock_.get(); }
std::unique_ptr<EchoControl> Create(int sample_rate_hz) override {
std::unique_ptr<EchoControl> mock = std::move(next_mock_);
next_mock_ = absl::make_unique<MockEchoControl>();
return mock;
}
private:
std::unique_ptr<MockEchoControl> next_mock_;
};
void InitializeAudioFrame(size_t input_rate,
size_t num_channels,
AudioFrame* frame) {
const size_t samples_per_input_channel = rtc::CheckedDivExact(
input_rate, static_cast<size_t>(rtc::CheckedDivExact(
1000, AudioProcessing::kChunkSizeMs)));
RTC_DCHECK_LE(samples_per_input_channel * num_channels,
AudioFrame::kMaxDataSizeSamples);
frame->samples_per_channel_ = samples_per_input_channel;
frame->sample_rate_hz_ = input_rate;
frame->num_channels_ = num_channels;
}
void FillFixedFrame(int16_t audio_level, AudioFrame* frame) {
const size_t num_samples = frame->samples_per_channel_ * frame->num_channels_;
for (size_t i = 0; i < num_samples; ++i) {
frame->mutable_data()[i] = audio_level;
}
}
// Mocks EchoDetector and records the first samples of the last analyzed render
// stream frame. Used to check what data is read by an EchoDetector
// implementation injected into an APM.
class TestEchoDetector : public EchoDetector {
public:
TestEchoDetector()
: analyze_render_audio_called_(false),
last_render_audio_first_sample_(0.f) {}
~TestEchoDetector() override = default;
void AnalyzeRenderAudio(rtc::ArrayView<const float> render_audio) override {
last_render_audio_first_sample_ = render_audio[0];
analyze_render_audio_called_ = true;
}
void AnalyzeCaptureAudio(rtc::ArrayView<const float> capture_audio) override {
}
void Initialize(int capture_sample_rate_hz,
int num_capture_channels,
int render_sample_rate_hz,
int num_render_channels) override {}
EchoDetector::Metrics GetMetrics() const override { return {}; }
// Returns true if AnalyzeRenderAudio() has been called at least once.
bool analyze_render_audio_called() const {
return analyze_render_audio_called_;
}
// Returns the first sample of the last analyzed render frame.
float last_render_audio_first_sample() const {
return last_render_audio_first_sample_;
}
private:
bool analyze_render_audio_called_;
float last_render_audio_first_sample_;
};
// Mocks CustomProcessing and applies ProcessSample() to all the samples.
// Meant to be injected into an APM to modify samples in a known and detectable
// way.
class TestRenderPreProcessor : public CustomProcessing {
public:
TestRenderPreProcessor() = default;
~TestRenderPreProcessor() = default;
void Initialize(int sample_rate_hz, int num_channels) override {}
void Process(AudioBuffer* audio) override {
for (size_t k = 0; k < audio->num_channels(); ++k) {
rtc::ArrayView<float> channel_view(audio->channels_f()[k],
audio->num_frames());
std::transform(channel_view.begin(), channel_view.end(),
channel_view.begin(), ProcessSample);
}
};
std::string ToString() const override { return "TestRenderPreProcessor"; }
void SetRuntimeSetting(AudioProcessing::RuntimeSetting setting) override {}
// Modifies a sample. This member is used in Process() to modify a frame and
// it is publicly visible to enable tests.
static constexpr float ProcessSample(float x) { return 2.f * x; }
};
} // namespace
TEST(AudioProcessingImplTest, AudioParameterChangeTriggersInit) {
webrtc::Config config;
MockInitialize mock(config);
ON_CALL(mock, InitializeLocked())
.WillByDefault(Invoke(&mock, &MockInitialize::RealInitializeLocked));
EXPECT_CALL(mock, InitializeLocked()).Times(1);
mock.Initialize();
AudioFrame frame;
// Call with the default parameters; there should be an init.
frame.num_channels_ = 1;
SetFrameSampleRate(&frame, 16000);
EXPECT_CALL(mock, InitializeLocked()).Times(0);
EXPECT_NOERR(mock.ProcessStream(&frame));
EXPECT_NOERR(mock.ProcessReverseStream(&frame));
// New sample rate. (Only impacts ProcessStream).
SetFrameSampleRate(&frame, 32000);
EXPECT_CALL(mock, InitializeLocked()).Times(1);
EXPECT_NOERR(mock.ProcessStream(&frame));
// New number of channels.
// TODO(peah): Investigate why this causes 2 inits.
frame.num_channels_ = 2;
EXPECT_CALL(mock, InitializeLocked()).Times(2);
EXPECT_NOERR(mock.ProcessStream(&frame));
// ProcessStream sets num_channels_ == num_output_channels.
frame.num_channels_ = 2;
EXPECT_NOERR(mock.ProcessReverseStream(&frame));
// A new sample rate passed to ProcessReverseStream should cause an init.
SetFrameSampleRate(&frame, 16000);
EXPECT_CALL(mock, InitializeLocked()).Times(1);
EXPECT_NOERR(mock.ProcessReverseStream(&frame));
}
TEST(AudioProcessingImplTest, UpdateCapturePreGainRuntimeSetting) {
std::unique_ptr<AudioProcessing> apm(AudioProcessingBuilder().Create());
webrtc::AudioProcessing::Config apm_config;
apm_config.pre_amplifier.enabled = true;
apm_config.pre_amplifier.fixed_gain_factor = 1.f;
apm->ApplyConfig(apm_config);
AudioFrame frame;
constexpr int16_t kAudioLevel = 10000;
constexpr size_t kSampleRateHz = 48000;
constexpr size_t kNumChannels = 2;
InitializeAudioFrame(kSampleRateHz, kNumChannels, &frame);
FillFixedFrame(kAudioLevel, &frame);
apm->ProcessStream(&frame);
EXPECT_EQ(frame.data()[100], kAudioLevel)
<< "With factor 1, frame shouldn't be modified.";
constexpr float kGainFactor = 2.f;
apm->SetRuntimeSetting(
AudioProcessing::RuntimeSetting::CreateCapturePreGain(kGainFactor));
// Process for two frames to have time to ramp up gain.
for (int i = 0; i < 2; ++i) {
FillFixedFrame(kAudioLevel, &frame);
apm->ProcessStream(&frame);
}
EXPECT_EQ(frame.data()[100], kGainFactor * kAudioLevel)
<< "Frame should be amplified.";
}
TEST(AudioProcessingImplTest,
EchoControllerObservesPreAmplifierEchoPathGainChange) {
// Tests that the echo controller observes an echo path gain change when the
// pre-amplifier submodule changes the gain.
auto echo_control_factory = absl::make_unique<MockEchoControlFactory>();
const auto* echo_control_factory_ptr = echo_control_factory.get();
std::unique_ptr<AudioProcessing> apm(
AudioProcessingBuilder()
.SetEchoControlFactory(std::move(echo_control_factory))
.Create());
apm->gain_control()->Enable(false); // Disable AGC.
apm->gain_control()->set_mode(GainControl::Mode::kFixedDigital);
webrtc::AudioProcessing::Config apm_config;
apm_config.gain_controller2.enabled = false;
apm_config.pre_amplifier.enabled = true;
apm_config.pre_amplifier.fixed_gain_factor = 1.f;
apm->ApplyConfig(apm_config);
AudioFrame frame;
constexpr int16_t kAudioLevel = 10000;
constexpr size_t kSampleRateHz = 48000;
constexpr size_t kNumChannels = 2;
InitializeAudioFrame(kSampleRateHz, kNumChannels, &frame);
FillFixedFrame(kAudioLevel, &frame);
MockEchoControl* echo_control_mock = echo_control_factory_ptr->GetNext();
EXPECT_CALL(*echo_control_mock, AnalyzeCapture(NotNull())).Times(1);
EXPECT_CALL(*echo_control_mock, ProcessCapture(NotNull(), false)).Times(1);
apm->ProcessStream(&frame);
EXPECT_CALL(*echo_control_mock, AnalyzeCapture(NotNull())).Times(1);
EXPECT_CALL(*echo_control_mock, ProcessCapture(NotNull(), true)).Times(1);
apm->SetRuntimeSetting(
AudioProcessing::RuntimeSetting::CreateCapturePreGain(2.f));
apm->ProcessStream(&frame);
}
TEST(AudioProcessingImplTest,
EchoControllerObservesAnalogAgc1EchoPathGainChange) {
// Tests that the echo controller observes an echo path gain change when the
// AGC1 analog adaptive submodule changes the analog gain.
auto echo_control_factory = absl::make_unique<MockEchoControlFactory>();
const auto* echo_control_factory_ptr = echo_control_factory.get();
std::unique_ptr<AudioProcessing> apm(
AudioProcessingBuilder()
.SetEchoControlFactory(std::move(echo_control_factory))
.Create());
apm->gain_control()->Enable(true); // Enable AGC.
apm->gain_control()->set_mode(GainControl::Mode::kAdaptiveAnalog);
webrtc::AudioProcessing::Config apm_config;
apm_config.gain_controller2.enabled = false;
apm_config.pre_amplifier.enabled = false;
apm->ApplyConfig(apm_config);
AudioFrame frame;
constexpr int16_t kAudioLevel = 1000;
constexpr size_t kSampleRateHz = 48000;
constexpr size_t kNumChannels = 2;
InitializeAudioFrame(kSampleRateHz, kNumChannels, &frame);
FillFixedFrame(kAudioLevel, &frame);
MockEchoControl* echo_control_mock = echo_control_factory_ptr->GetNext();
const int initial_analog_gain = apm->gain_control()->stream_analog_level();
EXPECT_CALL(*echo_control_mock, AnalyzeCapture(NotNull())).Times(1);
EXPECT_CALL(*echo_control_mock, ProcessCapture(NotNull(), false)).Times(1);
apm->ProcessStream(&frame);
// Force an analog gain change if it did not happen.
if (initial_analog_gain == apm->gain_control()->stream_analog_level()) {
apm->gain_control()->set_stream_analog_level(initial_analog_gain + 1);
}
EXPECT_CALL(*echo_control_mock, AnalyzeCapture(NotNull())).Times(1);
EXPECT_CALL(*echo_control_mock, ProcessCapture(NotNull(), true)).Times(1);
apm->ProcessStream(&frame);
}
TEST(AudioProcessingImplTest, RenderPreProcessorBeforeEchoDetector) {
// Make sure that signal changes caused by a render pre-processing sub-module
// take place before any echo detector analysis.
rtc::scoped_refptr<TestEchoDetector> test_echo_detector(
new rtc::RefCountedObject<TestEchoDetector>());
std::unique_ptr<CustomProcessing> test_render_pre_processor(
new TestRenderPreProcessor());
// Create APM injecting the test echo detector and render pre-processor.
std::unique_ptr<AudioProcessing> apm(
AudioProcessingBuilder()
.SetEchoDetector(test_echo_detector)
.SetRenderPreProcessing(std::move(test_render_pre_processor))
.Create());
webrtc::AudioProcessing::Config apm_config;
apm_config.pre_amplifier.enabled = true;
apm_config.residual_echo_detector.enabled = true;
apm->ApplyConfig(apm_config);
constexpr int16_t kAudioLevel = 1000;
constexpr int kSampleRateHz = 16000;
constexpr size_t kNumChannels = 1;
AudioFrame frame;
InitializeAudioFrame(kSampleRateHz, kNumChannels, &frame);
constexpr float kAudioLevelFloat = static_cast<float>(kAudioLevel);
constexpr float kExpectedPreprocessedAudioLevel =
TestRenderPreProcessor::ProcessSample(kAudioLevelFloat);
ASSERT_NE(kAudioLevelFloat, kExpectedPreprocessedAudioLevel);
// Analyze a render stream frame.
FillFixedFrame(kAudioLevel, &frame);
ASSERT_EQ(AudioProcessing::Error::kNoError,
apm->ProcessReverseStream(&frame));
// Trigger a call to in EchoDetector::AnalyzeRenderAudio() via
// ProcessStream().
FillFixedFrame(kAudioLevel, &frame);
ASSERT_EQ(AudioProcessing::Error::kNoError, apm->ProcessStream(&frame));
// Regardless of how the call to in EchoDetector::AnalyzeRenderAudio() is
// triggered, the line below checks that the call has occurred. If not, the
// APM implementation may have changed and this test might need to be adapted.
ASSERT_TRUE(test_echo_detector->analyze_render_audio_called());
// Check that the data read in EchoDetector::AnalyzeRenderAudio() is that
// produced by the render pre-processor.
EXPECT_EQ(kExpectedPreprocessedAudioLevel,
test_echo_detector->last_render_audio_first_sample());
}
} // namespace webrtc