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diff --git a/src/3rdparty/resonance-audio/resonance_audio/geometrical_acoustics/estimating_rt60.h b/src/3rdparty/resonance-audio/resonance_audio/geometrical_acoustics/estimating_rt60.h
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+/*
+Copyright 2018 Google Inc. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS-IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Function to estimate RT60s.
+
+#ifndef RESONANCE_AUDIO_GEOMETRICAL_ACOUSTICS_ESTIMATING_RT60_H_
+#define RESONANCE_AUDIO_GEOMETRICAL_ACOUSTICS_ESTIMATING_RT60_H_
+
+#include <vector>
+
+namespace vraudio {
+
+// Estimates the RT60 value from collected energy impulse responses.
+//
+// @param energy_impulse_responses Energy impulse responses.
+// @param sampling_rate Sampling rate in Hz. Used to convert indices of the
+//     impulse response vector to time in seconds.
+// @return Estimated RT60 value in seconds. Returns 0.0f (meaning no reverb
+//     effect at all) when the estimation fails.
+float EstimateRT60(const std::vector<float>& energy_impulse_responses,
+                   float sampling_rate);
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_GEOMETRICAL_ACOUSTICS_ESTIMATING_RT60_H_