Build WebRTC with data channel only.

webrtc/media/base/codec.cc

 /*
  *  Copyright (c) 2004 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/media/base/codec.h"
 
 #include <algorithm>
 #include <sstream>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/stringencode.h"
 #include "webrtc/base/stringutils.h"
 #include "webrtc/common_video/h264/profile_level_id.h"
 
 namespace cricket {
 
 static bool IsSameH264Profile(const CodecParameterMap& params1,
                               const CodecParameterMap& params2) {
+#if defined(HAVE_WEBRTC_VOICE) && defined(HAVE_WEBRTC_VIDEO)

[Taylor Brandstetter, 2017/05/11 04:43:11]

Only need HAVE_WEBRTC_VIDEO, technically

[Zhi Huang, 2017/05/12 20:05:33]

Done.

   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;
+#else
+  return false;

[Taylor Brandstetter, 2017/05/11 04:43:11]

In all of these "#else" blocks, can you add RTC_NOTREACHED, since this code is
never expected to be hit?

[Zhi Huang, 2017/05/12 20:05:33]

Done.

+#endif
 }
 
 bool FeedbackParam::operator==(const FeedbackParam& other) const {
   return _stricmp(other.id().c_str(), id().c_str()) == 0 &&
       _stricmp(other.param().c_str(), param().c_str()) == 0;
 }
 
 bool FeedbackParams::operator==(const FeedbackParams& other) const {
   return params_ == other.params_;
 }
@@ skipping 310 matching lines @@
     if (CodecNamesEq(codec.name.c_str(), kH264CodecName) &&
         !IsSameH264Profile(codec.params, supported_codec.params)) {
       continue;
     }
     return &supported_codec;
   }
   return nullptr;
 }
 
 }  // namespace cricket