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diff --git a/third_party/libwebrtc/api/voip/voip_codec.h b/third_party/libwebrtc/api/voip/voip_codec.h
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+/*
+ *  Copyright (c) 2020 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 API_VOIP_VOIP_CODEC_H_
+#define API_VOIP_VOIP_CODEC_H_
+
+#include <map>
+
+#include "api/audio_codecs/audio_format.h"
+#include "api/voip/voip_base.h"
+
+namespace webrtc {
+
+// VoipCodec interface currently provides any codec related interface
+// such as setting encoder and decoder types that are negotiated with
+// remote endpoint.  Typically after SDP offer and answer exchange,
+// the local endpoint understands what are the codec payload types that
+// are used with negotiated codecs.  This interface is subject to expand
+// as needed in future.
+//
+// This interface requires a channel id created via VoipBase interface.
+class VoipCodec {
+ public:
+  // Set encoder type here along with its payload type to use.
+  // Returns following VoipResult;
+  //  kOk - sending codec is set as provided.
+  //  kInvalidArgument - `channel_id` is invalid.
+  virtual VoipResult SetSendCodec(ChannelId channel_id,
+                                  int payload_type,
+                                  const SdpAudioFormat& encoder_spec) = 0;
+
+  // Set decoder payload type here. In typical offer and answer model,
+  // this should be called after payload type has been agreed in media
+  // session.  Note that payload type can differ with same codec in each
+  // direction.
+  // Returns following VoipResult;
+  //  kOk - receiving codecs are set as provided.
+  //  kInvalidArgument - `channel_id` is invalid.
+  virtual VoipResult SetReceiveCodecs(
+      ChannelId channel_id,
+      const std::map<int, SdpAudioFormat>& decoder_specs) = 0;
+
+ protected:
+  virtual ~VoipCodec() = default;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VOIP_VOIP_CODEC_H_