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diff --git a/src/3rdparty/resonance-audio/resonance_audio/graph/ambisonic_mixing_encoder_node.h b/src/3rdparty/resonance-audio/resonance_audio/graph/ambisonic_mixing_encoder_node.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_GRAPH_AMBISONIC_MIXING_ENCODER_NODE_H_
+#define RESONANCE_AUDIO_GRAPH_AMBISONIC_MIXING_ENCODER_NODE_H_
+
+#include <vector>
+
+#include "ambisonics/ambisonic_lookup_table.h"
+#include "base/audio_buffer.h"
+#include "base/spherical_angle.h"
+#include "dsp/gain_mixer.h"
+#include "graph/system_settings.h"
+#include "node/processing_node.h"
+
+namespace vraudio {
+
+// Node that accepts single mono sound object buffer as input and encodes it
+// into an Ambisonic sound field.
+class AmbisonicMixingEncoderNode : public ProcessingNode {
+ public:
+  // Initializes AmbisonicMixingEncoderNode class.
+  //
+  // @param system_settings Global system configuration.
+  // @param lookup_table Ambisonic encoding lookup table.
+  // @param ambisonic_order Order of Ambisonic sources.
+  AmbisonicMixingEncoderNode(const SystemSettings& system_settings,
+                             const AmbisonicLookupTable& lookup_table,
+                             int ambisonic_order);
+
+  // Node implementation.
+  bool CleanUp() final {
+    CallCleanUpOnInputNodes();
+    // Prevent node from being disconnected when all sources are removed.
+    return false;
+  }
+
+ protected:
+  // Implements ProcessingNode.
+  const AudioBuffer* AudioProcess(const NodeInput& input) override;
+
+ private:
+  const SystemSettings& system_settings_;
+  const AmbisonicLookupTable& lookup_table_;
+
+  // Ambisonic order of encoded sources.
+  const int ambisonic_order_;
+
+  // |GainMixer| instance.
+  GainMixer gain_mixer_;
+
+  // Encoding coefficient values to be applied to encode the input.
+  std::vector<float> coefficients_;
+};
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_GRAPH_AMBISONIC_MIXING_ENCODER_NODE_H_