Build WebRTC with data channel only.

webrtc/media/base/codec_video.cc

Index: webrtc/media/base/codec_video.cc
diff --git a/webrtc/media/base/codec_video.cc b/webrtc/media/base/codec_video.cc
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index 0000000000000000000000000000000000000000..553f4912b54c51aa219a546122727ad1e0235ffb
--- /dev/null
+++ b/webrtc/media/base/codec_video.cc
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+/*
+ *  Copyright (c) 2017 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.
+ */
+
+#include "webrtc/common_video/h264/profile_level_id.h"
+#include "webrtc/media/base/codec.h"
+
+namespace cricket {
+
+bool IsSameH264Profile(const CodecParameterMap& params1,
+                       const CodecParameterMap& params2) {
+  const rtc::Optional<webrtc::H264::ProfileLevelId> profile_level_id =
+      webrtc::H264::ParseSdpProfileLevelId(params1);
+  const rtc::Optional<webrtc::H264::ProfileLevelId> other_profile_level_id =
+      webrtc::H264::ParseSdpProfileLevelId(params2);
+  // Compare H264 profiles, but not levels.
+  return profile_level_id && other_profile_level_id &&
+         profile_level_id->profile == other_profile_level_id->profile;
+}
+}  // namespace cricket