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diff --git a/src/3rdparty/resonance-audio/resonance_audio/utils/sum_and_difference_processor.h b/src/3rdparty/resonance-audio/resonance_audio/utils/sum_and_difference_processor.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_UTILS_SUM_AND_DIFFERENCE_PROCESSOR_H_
+#define RESONANCE_AUDIO_UTILS_SUM_AND_DIFFERENCE_PROCESSOR_H_
+
+#include "base/audio_buffer.h"
+
+namespace vraudio {
+
+// Class which converts a 2-channel input audio buffer into its sum and
+// difference signals and stores them in the left and right channel
+// respectively.
+class SumAndDifferenceProcessor {
+ public:
+  // Constructs a stereo sum and difference processor.
+  //
+  // @param num_frames Number of frames in the stereo input audio buffer.
+  explicit SumAndDifferenceProcessor(size_t num_frames);
+
+  // Converts a 2-channel buffer signals into their sum and difference.
+  void Process(AudioBuffer* stereo_buffer);
+
+ private:
+  // Temporary audio buffer to store left channel input data during conversion.
+  AudioBuffer temp_buffer_;
+};
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_UTILS_SUM_AND_DIFFERENCE_PROCESSOR_H_