Support multiple rtx codecs.

talk/media/webrtc/webrtcvideoengine2.cc

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 339 matching lines @@
 
 static const int kDefaultRtcpReceiverReportSsrc = 1;
 
 std::vector<VideoCodec> DefaultVideoCodecList() {
   std::vector<VideoCodec> codecs;
   codecs.push_back(MakeVideoCodecWithDefaultFeedbackParams(kDefaultVp8PlType,
                                                            kVp8CodecName));
   if (CodecIsInternallySupported(kVp9CodecName)) {
     codecs.push_back(MakeVideoCodecWithDefaultFeedbackParams(kDefaultVp9PlType,
                                                              kVp9CodecName));
-    // TODO(andresp): Add rtx codec for vp9 and verify it works.
   }
   if (CodecIsInternallySupported(kH264CodecName)) {
     codecs.push_back(MakeVideoCodecWithDefaultFeedbackParams(kDefaultH264PlType,
                                                              kH264CodecName));
   }
   codecs.push_back(
       VideoCodec::CreateRtxCodec(kDefaultRtxVp8PlType, kDefaultVp8PlType));
+  if (CodecIsInternallySupported(kVp9CodecName)) {
+    codecs.push_back(
+        VideoCodec::CreateRtxCodec(kDefaultRtxVp9PlType, kDefaultVp9PlType));
+  }
   codecs.push_back(VideoCodec(kDefaultRedPlType, kRedCodecName));
+  codecs.push_back(
+      VideoCodec::CreateRtxCodec(kDefaultRtxRedPlType, kDefaultRedPlType));
   codecs.push_back(VideoCodec(kDefaultUlpfecType, kUlpfecCodecName));
   return codecs;
 }
 
 std::vector<webrtc::VideoStream>
 WebRtcVideoChannel2::WebRtcVideoSendStream::CreateSimulcastVideoStreams(
     const VideoCodec& codec,
     const VideoOptions& options,
     int max_bitrate_bps,
     size_t num_streams) {
@@ skipping 2169 matching lines @@
       video_codecs[i].rtx_payload_type = rtx_mapping[video_codecs[i].codec.id];
     }
   }
 
   return video_codecs;
 }
 
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VIDEO