1 files changed, 36 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/agc2/noise_level_estimator.h b/third_party/libwebrtc/modules/audio_processing/agc2/noise_level_estimator.h
new file mode 100644
index 0000000000..9f3b957486
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+++ b/third_party/libwebrtc/modules/audio_processing/agc2/noise_level_estimator.h
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2016 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_AGC2_NOISE_LEVEL_ESTIMATOR_H_
+#define MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_
+
+#include <memory>
+
+#include "modules/audio_processing/include/audio_frame_view.h"
+
+namespace webrtc {
+class ApmDataDumper;
+
+// Noise level estimator interface.
+class NoiseLevelEstimator {
+ public:
+  virtual ~NoiseLevelEstimator() = default;
+  // Analyzes a 10 ms `frame`, updates the noise level estimation and returns
+  // the value for the latter in dBFS.
+  virtual float Analyze(const AudioFrameView<const float>& frame) = 0;
+};
+
+// Creates a noise level estimator based on noise floor detection.
+std::unique_ptr<NoiseLevelEstimator> CreateNoiseFloorEstimator(
+    ApmDataDumper* data_dumper);
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_