Support multiple rtx codecs.

talk/media/base/constants.cc

 /*
  * libjingle
  * Copyright 2012 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 123 matching lines @@
 const char kVp8CodecName[] = "VP8";
 const char kVp9CodecName[] = "VP9";
 const char kH264CodecName[] = "H264";
 
 const int kDefaultVp8PlType = 100;
 const int kDefaultVp9PlType = 101;
 const int kDefaultH264PlType = 107;
 const int kDefaultRedPlType = 116;
 const int kDefaultUlpfecType = 117;
 const int kDefaultRtxVp8PlType = 96;
+const int kDefaultRtxVp9PlType = 97;
+const int kDefaultRtxRedPlType = 98;
 
 const int kDefaultVideoMaxWidth = 640;
 const int kDefaultVideoMaxHeight = 400;
 const int kDefaultVideoMaxFramerate = 30;
 }  // namespace cricket