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8037fc6ffa
Bug: webrtc:342905193 No-Try: True Change-Id: Icc968be43b8830038ea9a1f5f604307220457807 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/361021 Auto-Submit: Florent Castelli <orphis@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42911}
491 lines
22 KiB
C++
491 lines
22 KiB
C++
/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/audio_processing/agc2/clipping_predictor.h"
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#include <cstdint>
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#include <limits>
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#include <tuple>
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#include "rtc_base/checks.h"
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#include "test/gmock.h"
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#include "test/gtest.h"
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namespace webrtc {
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namespace {
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using ::testing::Eq;
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using ::testing::Optional;
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using ClippingPredictorConfig = AudioProcessing::Config::GainController1::
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AnalogGainController::ClippingPredictor;
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using ClippingPredictorMode = AudioProcessing::Config::GainController1::
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AnalogGainController::ClippingPredictor::Mode;
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constexpr int kSampleRateHz = 32000;
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constexpr int kNumChannels = 1;
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constexpr int kSamplesPerChannel = kSampleRateHz / 100;
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constexpr int kMaxMicLevel = 255;
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constexpr int kMinMicLevel = 12;
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constexpr int kDefaultClippedLevelStep = 15;
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constexpr float kMaxSampleS16 =
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static_cast<float>(std::numeric_limits<int16_t>::max());
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// Threshold in dB corresponding to a signal with an amplitude equal to 99% of
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// the dynamic range - i.e., computed as `20*log10(0.99)`.
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constexpr float kClippingThresholdDb = -0.08729610804900176f;
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void CallAnalyze(int num_calls,
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const AudioFrameView<const float>& frame,
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ClippingPredictor& predictor) {
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for (int i = 0; i < num_calls; ++i) {
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predictor.Analyze(frame);
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}
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}
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// Creates and analyzes an audio frame with a non-zero (approx. 4.15dB) crest
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// factor.
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void AnalyzeNonZeroCrestFactorAudio(int num_calls,
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int num_channels,
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float peak_ratio,
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ClippingPredictor& predictor) {
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RTC_DCHECK_GT(num_calls, 0);
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RTC_DCHECK_GT(num_channels, 0);
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RTC_DCHECK_LE(peak_ratio, 1.0f);
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std::vector<float*> audio(num_channels);
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std::vector<float> audio_data(num_channels * kSamplesPerChannel, 0.0f);
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for (int channel = 0; channel < num_channels; ++channel) {
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audio[channel] = &audio_data[channel * kSamplesPerChannel];
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for (int sample = 0; sample < kSamplesPerChannel; sample += 10) {
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audio[channel][sample] = 0.1f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 1] = 0.2f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 2] = 0.3f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 3] = 0.4f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 4] = 0.5f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 5] = 0.6f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 6] = 0.7f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 7] = 0.8f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 8] = 0.9f * peak_ratio * kMaxSampleS16;
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audio[channel][sample + 9] = 1.0f * peak_ratio * kMaxSampleS16;
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}
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}
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AudioFrameView<const float> frame(audio.data(), num_channels,
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kSamplesPerChannel);
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CallAnalyze(num_calls, frame, predictor);
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}
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void CheckChannelEstimatesWithValue(int num_channels,
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int level,
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int default_step,
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int min_mic_level,
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int max_mic_level,
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const ClippingPredictor& predictor,
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int expected) {
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for (int i = 0; i < num_channels; ++i) {
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SCOPED_TRACE(i);
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EXPECT_THAT(predictor.EstimateClippedLevelStep(
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i, level, default_step, min_mic_level, max_mic_level),
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Optional(Eq(expected)));
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}
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}
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void CheckChannelEstimatesWithoutValue(int num_channels,
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int level,
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int default_step,
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int min_mic_level,
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int max_mic_level,
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const ClippingPredictor& predictor) {
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for (int i = 0; i < num_channels; ++i) {
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SCOPED_TRACE(i);
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EXPECT_EQ(predictor.EstimateClippedLevelStep(i, level, default_step,
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min_mic_level, max_mic_level),
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std::nullopt);
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}
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}
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// Creates and analyzes an audio frame with a zero crest factor.
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void AnalyzeZeroCrestFactorAudio(int num_calls,
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int num_channels,
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float peak_ratio,
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ClippingPredictor& predictor) {
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RTC_DCHECK_GT(num_calls, 0);
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RTC_DCHECK_GT(num_channels, 0);
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RTC_DCHECK_LE(peak_ratio, 1.f);
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std::vector<float*> audio(num_channels);
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std::vector<float> audio_data(num_channels * kSamplesPerChannel, 0.f);
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for (int channel = 0; channel < num_channels; ++channel) {
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audio[channel] = &audio_data[channel * kSamplesPerChannel];
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for (int sample = 0; sample < kSamplesPerChannel; ++sample) {
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audio[channel][sample] = peak_ratio * kMaxSampleS16;
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}
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}
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auto frame = AudioFrameView<const float>(audio.data(), num_channels,
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kSamplesPerChannel);
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CallAnalyze(num_calls, frame, predictor);
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}
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TEST(ClippingPeakPredictorTest, NoPredictorCreated) {
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auto predictor =
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CreateClippingPredictor(kNumChannels, /*config=*/{/*enabled=*/false});
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EXPECT_FALSE(predictor);
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}
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TEST(ClippingPeakPredictorTest, ClippingEventPredictionCreated) {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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auto predictor = CreateClippingPredictor(
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kNumChannels,
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/*config=*/{/*enabled=*/true,
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/*mode=*/ClippingPredictorMode::kClippingEventPrediction});
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EXPECT_TRUE(predictor);
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}
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TEST(ClippingPeakPredictorTest, AdaptiveStepClippingPeakPredictionCreated) {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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auto predictor = CreateClippingPredictor(
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kNumChannels, /*config=*/{
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/*enabled=*/true,
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/*mode=*/ClippingPredictorMode::kAdaptiveStepClippingPeakPrediction});
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EXPECT_TRUE(predictor);
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}
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TEST(ClippingPeakPredictorTest, FixedStepClippingPeakPredictionCreated) {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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auto predictor = CreateClippingPredictor(
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kNumChannels, /*config=*/{
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/*enabled=*/true,
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/*mode=*/ClippingPredictorMode::kFixedStepClippingPeakPrediction});
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EXPECT_TRUE(predictor);
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}
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class ClippingPredictorParameterization
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: public ::testing::TestWithParam<std::tuple<int, int, int, int>> {
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protected:
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int num_channels() const { return std::get<0>(GetParam()); }
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ClippingPredictorConfig GetConfig(ClippingPredictorMode mode) const {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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return {/*enabled=*/true,
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/*mode=*/mode,
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/*window_length=*/std::get<1>(GetParam()),
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/*reference_window_length=*/std::get<2>(GetParam()),
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/*reference_window_delay=*/std::get<3>(GetParam()),
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/*clipping_threshold=*/-1.0f,
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/*crest_factor_margin=*/0.5f};
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}
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};
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TEST_P(ClippingPredictorParameterization,
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CheckClippingEventPredictorEstimateAfterCrestFactorDrop) {
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const ClippingPredictorConfig config =
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GetConfig(ClippingPredictorMode::kClippingEventPrediction);
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if (config.reference_window_length + config.reference_window_delay <=
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config.window_length) {
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return;
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}
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auto predictor = CreateClippingPredictor(num_channels(), config);
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AnalyzeNonZeroCrestFactorAudio(
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/*num_calls=*/config.reference_window_length +
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config.reference_window_delay - config.window_length,
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num_channels(), /*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(num_channels(), /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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AnalyzeZeroCrestFactorAudio(config.window_length, num_channels(),
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithValue(
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num_channels(), /*level=*/255, kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor, kDefaultClippedLevelStep);
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}
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TEST_P(ClippingPredictorParameterization,
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CheckClippingEventPredictorNoEstimateAfterConstantCrestFactor) {
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const ClippingPredictorConfig config =
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GetConfig(ClippingPredictorMode::kClippingEventPrediction);
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if (config.reference_window_length + config.reference_window_delay <=
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config.window_length) {
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return;
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}
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auto predictor = CreateClippingPredictor(num_channels(), config);
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AnalyzeNonZeroCrestFactorAudio(
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/*num_calls=*/config.reference_window_length +
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config.reference_window_delay - config.window_length,
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num_channels(), /*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(num_channels(), /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/config.window_length,
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num_channels(),
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(num_channels(), /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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}
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TEST_P(ClippingPredictorParameterization,
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CheckClippingPeakPredictorEstimateAfterHighCrestFactor) {
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const ClippingPredictorConfig config =
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GetConfig(ClippingPredictorMode::kAdaptiveStepClippingPeakPrediction);
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if (config.reference_window_length + config.reference_window_delay <=
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config.window_length) {
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return;
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}
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auto predictor = CreateClippingPredictor(num_channels(), config);
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AnalyzeNonZeroCrestFactorAudio(
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/*num_calls=*/config.reference_window_length +
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config.reference_window_delay - config.window_length,
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num_channels(), /*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(num_channels(), /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/config.window_length,
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num_channels(),
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithValue(
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num_channels(), /*level=*/255, kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor, kDefaultClippedLevelStep);
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}
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TEST_P(ClippingPredictorParameterization,
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CheckClippingPeakPredictorNoEstimateAfterLowCrestFactor) {
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const ClippingPredictorConfig config =
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GetConfig(ClippingPredictorMode::kAdaptiveStepClippingPeakPrediction);
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if (config.reference_window_length + config.reference_window_delay <=
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config.window_length) {
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return;
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}
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auto predictor = CreateClippingPredictor(num_channels(), config);
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AnalyzeZeroCrestFactorAudio(
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/*num_calls=*/config.reference_window_length +
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config.reference_window_delay - config.window_length,
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num_channels(), /*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(num_channels(), /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/config.window_length,
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num_channels(),
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(num_channels(), /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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}
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INSTANTIATE_TEST_SUITE_P(GainController1ClippingPredictor,
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ClippingPredictorParameterization,
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::testing::Combine(::testing::Values(1, 5),
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::testing::Values(1, 5, 10),
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::testing::Values(1, 5),
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::testing::Values(0, 1, 5)));
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class ClippingEventPredictorParameterization
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: public ::testing::TestWithParam<std::tuple<float, float>> {
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protected:
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ClippingPredictorConfig GetConfig() const {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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return {/*enabled=*/true,
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/*mode=*/ClippingPredictorMode::kClippingEventPrediction,
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/*window_length=*/5,
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/*reference_window_length=*/5,
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/*reference_window_delay=*/5,
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/*clipping_threshold=*/std::get<0>(GetParam()),
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/*crest_factor_margin=*/std::get<1>(GetParam())};
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}
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};
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TEST_P(ClippingEventPredictorParameterization,
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CheckEstimateAfterCrestFactorDrop) {
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const ClippingPredictorConfig config = GetConfig();
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auto predictor = CreateClippingPredictor(kNumChannels, config);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/config.reference_window_length,
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kNumChannels, /*peak_ratio=*/0.99f,
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*predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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AnalyzeZeroCrestFactorAudio(config.window_length, kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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// TODO(bugs.webrtc.org/12774): Add clarifying comment.
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// TODO(bugs.webrtc.org/12774): Remove 4.15f threshold and split tests.
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if (config.clipping_threshold < kClippingThresholdDb &&
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config.crest_factor_margin < 4.15f) {
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CheckChannelEstimatesWithValue(
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kNumChannels, /*level=*/255, kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor, kDefaultClippedLevelStep);
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} else {
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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}
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}
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INSTANTIATE_TEST_SUITE_P(GainController1ClippingPredictor,
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ClippingEventPredictorParameterization,
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::testing::Combine(::testing::Values(-1.0f, 0.0f),
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::testing::Values(3.0f, 4.16f)));
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class ClippingPredictorModeParameterization
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: public ::testing::TestWithParam<ClippingPredictorMode> {
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protected:
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ClippingPredictorConfig GetConfig(float clipping_threshold_dbfs) const {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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return {/*enabled=*/true,
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/*mode=*/GetParam(),
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/*window_length=*/5,
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/*reference_window_length=*/5,
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/*reference_window_delay=*/5,
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/*clipping_threshold=*/clipping_threshold_dbfs,
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/*crest_factor_margin=*/3.0f};
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}
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};
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TEST_P(ClippingPredictorModeParameterization,
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CheckEstimateAfterHighCrestFactorWithNoClippingMargin) {
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const ClippingPredictorConfig config = GetConfig(
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/*clipping_threshold_dbfs=*/0.0f);
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auto predictor = CreateClippingPredictor(kNumChannels, config);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/config.reference_window_length,
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kNumChannels, /*peak_ratio=*/0.99f,
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*predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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AnalyzeZeroCrestFactorAudio(config.window_length, kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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// Since the clipping threshold is set to 0 dBFS, `EstimateClippedLevelStep()`
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// is expected to return an unavailable value.
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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}
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TEST_P(ClippingPredictorModeParameterization,
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CheckEstimateAfterHighCrestFactorWithClippingMargin) {
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const ClippingPredictorConfig config =
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GetConfig(/*clipping_threshold_dbfs=*/-1.0f);
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auto predictor = CreateClippingPredictor(kNumChannels, config);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/config.reference_window_length,
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kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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AnalyzeZeroCrestFactorAudio(config.window_length, kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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// TODO(bugs.webrtc.org/12774): Add clarifying comment.
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const float expected_step =
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config.mode == ClippingPredictorMode::kAdaptiveStepClippingPeakPrediction
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? 17
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: kDefaultClippedLevelStep;
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CheckChannelEstimatesWithValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor, expected_step);
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}
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INSTANTIATE_TEST_SUITE_P(
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GainController1ClippingPredictor,
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ClippingPredictorModeParameterization,
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::testing::Values(
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ClippingPredictorMode::kAdaptiveStepClippingPeakPrediction,
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ClippingPredictorMode::kFixedStepClippingPeakPrediction));
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TEST(ClippingEventPredictorTest, CheckEstimateAfterReset) {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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constexpr ClippingPredictorConfig kConfig{
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/*enabled=*/true,
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/*mode=*/ClippingPredictorMode::kClippingEventPrediction,
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/*window_length=*/5,
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/*reference_window_length=*/5,
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/*reference_window_delay=*/5,
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/*clipping_threshold=*/-1.0f,
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/*crest_factor_margin=*/3.0f};
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auto predictor = CreateClippingPredictor(kNumChannels, kConfig);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/kConfig.reference_window_length,
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kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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predictor->Reset();
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AnalyzeZeroCrestFactorAudio(kConfig.window_length, kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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}
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TEST(ClippingPeakPredictorTest, CheckNoEstimateAfterReset) {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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constexpr ClippingPredictorConfig kConfig{
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/*enabled=*/true,
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/*mode=*/ClippingPredictorMode::kAdaptiveStepClippingPeakPrediction,
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/*window_length=*/5,
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/*reference_window_length=*/5,
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/*reference_window_delay=*/5,
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/*clipping_threshold=*/-1.0f};
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auto predictor = CreateClippingPredictor(kNumChannels, kConfig);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/kConfig.reference_window_length,
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kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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predictor->Reset();
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AnalyzeZeroCrestFactorAudio(kConfig.window_length, kNumChannels,
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/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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kMaxMicLevel, *predictor);
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}
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TEST(ClippingPeakPredictorTest, CheckAdaptiveStepEstimate) {
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// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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constexpr ClippingPredictorConfig kConfig{
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|
/*enabled=*/true,
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|
/*mode=*/ClippingPredictorMode::kAdaptiveStepClippingPeakPrediction,
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/*window_length=*/5,
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/*reference_window_length=*/5,
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/*reference_window_delay=*/5,
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/*clipping_threshold=*/-1.0f};
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auto predictor = CreateClippingPredictor(kNumChannels, kConfig);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/kConfig.reference_window_length,
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kNumChannels, /*peak_ratio=*/0.99f,
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*predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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|
kMaxMicLevel, *predictor);
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AnalyzeZeroCrestFactorAudio(kConfig.window_length, kNumChannels,
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|
/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithValue(kNumChannels, /*level=*/255,
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kDefaultClippedLevelStep, kMinMicLevel,
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|
kMaxMicLevel, *predictor, /*expected=*/17);
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}
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TEST(ClippingPeakPredictorTest, CheckFixedStepEstimate) {
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|
// TODO(bugs.webrtc.org/12874): Use designated initializers one fixed.
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|
constexpr ClippingPredictorConfig kConfig{
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|
/*enabled=*/true,
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|
/*mode=*/ClippingPredictorMode::kFixedStepClippingPeakPrediction,
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/*window_length=*/5,
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/*reference_window_length=*/5,
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/*reference_window_delay=*/5,
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/*clipping_threshold=*/-1.0f};
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auto predictor = CreateClippingPredictor(kNumChannels, kConfig);
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AnalyzeNonZeroCrestFactorAudio(/*num_calls=*/kConfig.reference_window_length,
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kNumChannels, /*peak_ratio=*/0.99f,
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|
*predictor);
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CheckChannelEstimatesWithoutValue(kNumChannels, /*level=*/255,
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|
kDefaultClippedLevelStep, kMinMicLevel,
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|
kMaxMicLevel, *predictor);
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AnalyzeZeroCrestFactorAudio(kConfig.window_length, kNumChannels,
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|
/*peak_ratio=*/0.99f, *predictor);
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CheckChannelEstimatesWithValue(
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kNumChannels, /*level=*/255, kDefaultClippedLevelStep, kMinMicLevel,
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|
kMaxMicLevel, *predictor, kDefaultClippedLevelStep);
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}
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} // namespace
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} // namespace webrtc
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