Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 85 insertions, 0 deletions

diff --git a/third_party/libwebrtc/modules/audio_processing/aec3/echo_audibility.h b/third_party/libwebrtc/modules/audio_processing/aec3/echo_audibility.h
new file mode 100644
index 0000000000..b9d6f87d2a
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_processing/aec3/echo_audibility.h
@@ -0,0 +1,85 @@
+/*
+ *  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.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_
+
+#include <stddef.h>
+
+#include "absl/types/optional.h"
+#include "api/array_view.h"
+#include "modules/audio_processing/aec3/block_buffer.h"
+#include "modules/audio_processing/aec3/render_buffer.h"
+#include "modules/audio_processing/aec3/spectrum_buffer.h"
+#include "modules/audio_processing/aec3/stationarity_estimator.h"
+
+namespace webrtc {
+
+class EchoAudibility {
+ public:
+  explicit EchoAudibility(bool use_render_stationarity_at_init);
+  ~EchoAudibility();
+
+  EchoAudibility(const EchoAudibility&) = delete;
+  EchoAudibility& operator=(const EchoAudibility&) = delete;
+
+  // Feed new render data to the echo audibility estimator.
+  void Update(const RenderBuffer& render_buffer,
+              rtc::ArrayView<const float> average_reverb,
+              int min_channel_delay_blocks,
+              bool external_delay_seen);
+  // Get the residual echo scaling.
+  void GetResidualEchoScaling(bool filter_has_had_time_to_converge,
+                              rtc::ArrayView<float> residual_scaling) const {
+    for (size_t band = 0; band < residual_scaling.size(); ++band) {
+      if (render_stationarity_.IsBandStationary(band) &&
+          (filter_has_had_time_to_converge ||
+           use_render_stationarity_at_init_)) {
+        residual_scaling[band] = 0.f;
+      } else {
+        residual_scaling[band] = 1.0f;
+      }
+    }
+  }
+
+  // Returns true if the current render block is estimated as stationary.
+  bool IsBlockStationary() const {
+    return render_stationarity_.IsBlockStationary();
+  }
+
+ private:
+  // Reset the EchoAudibility class.
+  void Reset();
+
+  // Updates the render stationarity flags for the current frame.
+  void UpdateRenderStationarityFlags(const RenderBuffer& render_buffer,
+                                     rtc::ArrayView<const float> average_reverb,
+                                     int delay_blocks);
+
+  // Updates the noise estimator with the new render data since the previous
+  // call to this method.
+  void UpdateRenderNoiseEstimator(const SpectrumBuffer& spectrum_buffer,
+                                  const BlockBuffer& block_buffer,
+                                  bool external_delay_seen);
+
+  // Returns a bool being true if the render signal contains just close to zero
+  // values.
+  bool IsRenderTooLow(const BlockBuffer& block_buffer);
+
+  absl::optional<int> render_spectrum_write_prev_;
+  int render_block_write_prev_;
+  bool non_zero_render_seen_;
+  const bool use_render_stationarity_at_init_;
+  StationarityEstimator render_stationarity_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_