Update to current webrtc library

This is from the upstream library commit id
3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium
88.0.4290.1.

webrtc/modules/audio_processing/aec3/erle_estimator.h

@@ -0,0 +1,99 @@
+/*
+ *  Copyright (c) 2017 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.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_
+
+#include <stddef.h>
+
+#include <array>
+#include <memory>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/array_view.h"
+#include "api/audio/echo_canceller3_config.h"
+#include "modules/audio_processing/aec3/aec3_common.h"
+#include "modules/audio_processing/aec3/fullband_erle_estimator.h"
+#include "modules/audio_processing/aec3/render_buffer.h"
+#include "modules/audio_processing/aec3/signal_dependent_erle_estimator.h"
+#include "modules/audio_processing/aec3/subband_erle_estimator.h"
+#include "modules/audio_processing/logging/apm_data_dumper.h"
+
+namespace webrtc {
+
+// Estimates the echo return loss enhancement. One estimate is done per subband
+// and another one is done using the aggreation of energy over all the subbands.
+class ErleEstimator {
+ public:
+  ErleEstimator(size_t startup_phase_length_blocks,
+                const EchoCanceller3Config& config,
+                size_t num_capture_channels);
+  ~ErleEstimator();
+
+  // Resets the fullband ERLE estimator and the subbands ERLE estimators.
+  void Reset(bool delay_change);
+
+  // Updates the ERLE estimates.
+  void Update(
+      const RenderBuffer& render_buffer,
+      rtc::ArrayView<const std::vector<std::array<float, kFftLengthBy2Plus1>>>
+          filter_frequency_responses,
+      rtc::ArrayView<const float, kFftLengthBy2Plus1>
+          avg_render_spectrum_with_reverb,
+      rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+          capture_spectra,
+      rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
+          subtractor_spectra,
+      const std::vector<bool>& converged_filters);
+
+  // Returns the most recent subband ERLE estimates.
+  rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Erle() const {
+    return signal_dependent_erle_estimator_
+               ? signal_dependent_erle_estimator_->Erle()
+               : subband_erle_estimator_.Erle();
+  }
+
+  // Returns the subband ERLE that are estimated during onsets (only used for
+  // testing).
+  rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> ErleOnsets()
+      const {
+    return subband_erle_estimator_.ErleOnsets();
+  }
+
+  // Returns the fullband ERLE estimate.
+  float FullbandErleLog2() const {
+    return fullband_erle_estimator_.FullbandErleLog2();
+  }
+
+  // Returns an estimation of the current linear filter quality based on the
+  // current and past fullband ERLE estimates. The returned value is a float
+  // vector with content between 0 and 1 where 1 indicates that, at this current
+  // time instant, the linear filter is reaching its maximum subtraction
+  // performance.
+  rtc::ArrayView<const absl::optional<float>> GetInstLinearQualityEstimates()
+      const {
+    return fullband_erle_estimator_.GetInstLinearQualityEstimates();
+  }
+
+  void Dump(const std::unique_ptr<ApmDataDumper>& data_dumper) const;
+
+ private:
+  const size_t startup_phase_length_blocks_;
+  FullBandErleEstimator fullband_erle_estimator_;
+  SubbandErleEstimator subband_erle_estimator_;
+  std::unique_ptr<SignalDependentErleEstimator>
+      signal_dependent_erle_estimator_;
+  size_t blocks_since_reset_ = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_