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diff --git a/src/3rdparty/resonance-audio/resonance_audio/dsp/occlusion_calculator.h b/src/3rdparty/resonance-audio/resonance_audio/dsp/occlusion_calculator.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.
+*/
+
+#ifndef RESONANCE_AUDIO_DSP_OCCLUSION_CALCULATOR_H_
+#define RESONANCE_AUDIO_DSP_OCCLUSION_CALCULATOR_H_
+
+#include "base/spherical_angle.h"
+
+namespace vraudio {
+
+// Calculates directivity gain value for supplied source and listener
+// parameters.
+//
+// @param alpha Balance between dipole pattern and omnidirectional pattern for
+//     source emission. By varying this value, differing directivity patterns
+//     can be formed. Value in range [0, 1]. 2D visualization for several
+//     values: http://goo.gl/GhKvoc.
+// @param order Order of directivity function. Higher values will result in
+//     increased directivity. Value in range [1, +inf]. 2D visualization for
+//     several orders:
+//     http://goo.gl/sNrm1a.
+// @param spherical_angle Spherical angle of the listener relative to the
+//     audio source which is being shaped.
+// @return Gain value in range [0, 1].
+float CalculateDirectivity(float alpha, float order,
+                           const SphericalAngle& spherical_angle);
+
+// This function calculates a |MonoPoleFilter| coefficient based upon the
+// directivity and occlusion values. The coefficient calculation was designed
+// via empirical methods.
+//
+// @param directivity Gain value calculated based upon the directivity.
+// @param occlusion_intensity Gain value calculated based upon the degree of
+// occlusion.
+// @return Filter coefficient for a mono pole low pass filter.
+float CalculateOcclusionFilterCoefficient(float directivity,
+                                          float occlusion_intensity);
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_DSP_OCCLUSION_CALCULATOR_H_