Add RTX codecs for codecs only supported by external encoder.

webrtc/media/base/mediaconstants.h

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 109 matching lines @@
 extern const char kVp8CodecName[];
 extern const char kVp9CodecName[];
 extern const char kH264CodecName[];
 
 // RFC 6184 RTP Payload Format for H.264 video
 extern const char kH264FmtpProfileLevelId[];
 extern const char kH264FmtpLevelAsymmetryAllowed[];
 extern const char kH264FmtpPacketizationMode[];
 extern const char kH264ProfileLevelConstrainedBaseline[];
 
+extern const int kDynamicPayloadTypeMin;
 extern const int kDefaultVp8PlType;
 extern const int kDefaultVp9PlType;
 extern const int kDefaultH264PlType;
 extern const int kDefaultRedPlType;
 extern const int kDefaultUlpfecType;
 extern const int kDefaultRtxVp8PlType;

[pbos-webrtc, 2016/06/26 21:55:58]

Shouldn't you remove these RTX payload types then?

[Taylor Brandstetter, 2016/06/27 17:46:44]

I will later, but I don't know how many people depend on specific payload types
(they shouldn't, but it's possible). If I remove the defaults and something
breaks and I need to revert, I don't want to have to revert this bug fix as
well.

 extern const int kDefaultRtxVp9PlType;
 extern const int kDefaultRtxRedPlType;
 extern const int kDefaultRtxH264PlType;
 
 extern const int kDefaultVideoMaxWidth;
 extern const int kDefaultVideoMaxHeight;
 extern const int kDefaultVideoMaxFramerate;
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_MEDIACONSTANTS_H_