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diff --git a/cast/streaming/remoting_capabilities.h b/cast/streaming/remoting_capabilities.h
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+++ b/cast/streaming/remoting_capabilities.h
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+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CAST_STREAMING_REMOTING_CAPABILITIES_H_
+#define CAST_STREAMING_REMOTING_CAPABILITIES_H_
+
+#include <string>
+#include <vector>
+
+namespace openscreen {
+namespace cast {
+
+// Audio capabilities are how receivers indicate support for remoting codecs--
+// as remoting does not include the actual codec in the OFFER message.
+enum class AudioCapability {
+  // The "baseline set" is used in Chrome to check support for a wide
+  // variety of audio codecs in media/remoting/renderer_controller.cc, including
+  // but not limited to MP3, PCM, Ogg Vorbis, and FLAC.
+  kBaselineSet,
+  kAac,
+  kOpus,
+};
+
+// Similar to audio capabilities, video capabilities are how the receiver
+// indicates support for certain video codecs, as well as support for streaming
+// 4k content. It is assumed by the sender that the receiver can support 4k
+// on all supported codecs.
+enum class VideoCapability {
+  // |kSupports4k| indicates that the receiver wants and can support 4k remoting
+  // content--both decoding/rendering and either a native 4k display or
+  // downscaling to the display's native resolution.
+  // TODO(issuetracker.google.com/184429130): |kSupports4k| is not super helpful
+  // for enabling 4k support, as receivers may not support 4k for all types of
+  // content.
+  kSupports4k,
+  kH264,
+  kVp8,
+  kVp9,
+  kHevc,
+  kAv1
+};
+
+// This class is similar to the RemotingSinkMetadata in Chrome, however
+// it is focused around our needs and is not mojom-based. This contains
+// a rough set of capabilities of the receiver to give the sender an idea of
+// what features are suppported for remoting.
+// TODO(issuetracker.google.com/184189100): this object should be expanded to
+// allow more specific constraint tracking.
+struct RemotingCapabilities {
+  // Receiver audio-specific capabilities.
+  std::vector<AudioCapability> audio;
+
+  // Receiver video-specific capabilities.
+  std::vector<VideoCapability> video;
+};
+
+}  // namespace cast
+}  // namespace openscreen
+
+#endif  // CAST_STREAMING_REMOTING_CAPABILITIES_H_