Update to current webrtc library

This is from the upstream library commit id 3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium 88.0.4290.1.
2020-10-12 18:08:02 -04:00
parent b1b02581d3
commit bcec8b0b21
859 changed files with 76187 additions and 49580 deletions
--- a/webrtc/modules/audio_processing/aec3/subband_nearend_detector.cc
+++ b/webrtc/modules/audio_processing/aec3/subband_nearend_detector.cc
@ -0,0 +1,70 @@
+/*
+ *  Copyright (c) 2019 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/aec3/subband_nearend_detector.h"
+
+#include <numeric>
+
+namespace webrtc {
+SubbandNearendDetector::SubbandNearendDetector(
+    const EchoCanceller3Config::Suppressor::SubbandNearendDetection& config,
+    size_t num_capture_channels)
+    : config_(config),
+      num_capture_channels_(num_capture_channels),
+      nearend_smoothers_(num_capture_channels_,
+                         aec3::MovingAverage(kFftLengthBy2Plus1,
+                                             config_.nearend_average_blocks)),
+      one_over_subband_length1_(
+          1.f / (config_.subband1.high - config_.subband1.low + 1)),
+      one_over_subband_length2_(
+          1.f / (config_.subband2.high - config_.subband2.low + 1)) {}
+
+void SubbandNearendDetector::Update(
+    rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+        nearend_spectrum,
+    rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+        residual_echo_spectrum,
+    rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+        comfort_noise_spectrum,
+    bool initial_state) {
+  nearend_state_ = false;
+  for (size_t ch = 0; ch < num_capture_channels_; ++ch) {
+    const std::array<float, kFftLengthBy2Plus1>& noise =
+        comfort_noise_spectrum[ch];
+    std::array<float, kFftLengthBy2Plus1> nearend;
+    nearend_smoothers_[ch].Average(nearend_spectrum[ch], nearend);
+
+    // Noise power of the first region.
+    float noise_power =
+        std::accumulate(noise.begin() + config_.subband1.low,
+                        noise.begin() + config_.subband1.high + 1, 0.f) *
+        one_over_subband_length1_;
+
+    // Nearend power of the first region.
+    float nearend_power_subband1 =
+        std::accumulate(nearend.begin() + config_.subband1.low,
+                        nearend.begin() + config_.subband1.high + 1, 0.f) *
+        one_over_subband_length1_;
+
+    // Nearend power of the second region.
+    float nearend_power_subband2 =
+        std::accumulate(nearend.begin() + config_.subband2.low,
+                        nearend.begin() + config_.subband2.high + 1, 0.f) *
+        one_over_subband_length2_;
+
+    // One channel is sufficient to trigger nearend state.
+    nearend_state_ =
+        nearend_state_ ||
+        (nearend_power_subband1 <
+             config_.nearend_threshold * nearend_power_subband2 &&
+         (nearend_power_subband1 > config_.snr_threshold * noise_power));
+  }
+}
+}  // namespace webrtc