Generate FMTP parameters for the H.264 codec.

webrtc/media/base/mediaconstants.cc

Index: webrtc/media/base/mediaconstants.cc
diff --git a/webrtc/media/base/mediaconstants.cc b/webrtc/media/base/mediaconstants.cc
index 2190a54d1009922acb0af7404de38c63433c9089..d6bb7e3d48a68dc6b07dd72cce37f61a57672a13 100644
--- a/webrtc/media/base/mediaconstants.cc
+++ b/webrtc/media/base/mediaconstants.cc
@@ -116,6 +116,12 @@ const char kVp8CodecName[] = "VP8";
 const char kVp9CodecName[] = "VP9";
 const char kH264CodecName[] = "H264";
 
+// RFC 6184 RTP Payload Format for H.264 video
+const char kH264FmtpProfileLevelId[] = "profile-level-id";

[juberti2, 2016/04/13 20:20:58]

The precedent here is kCodecParamFoo, or perhaps in this case, kH264Param foo
(see the opus params above).

[hta-webrtc, 2016/04/13 20:43:58]

The precedent is wrong. The namespace for FMTP parameters is scoped by codec,
mixing the names of FMTP codec parameters like these with the names of codec
parameters that go on a= lines is going to cause confusion.

+const char kH264FmtpLevelAsymmetryAllowed[] = "level-asymmetry-allowed";
+const char kH264FmtpPacketizationMode[] = "packetization-mode";
+const char kH264ProfileLevelConstrainedBaseline[] = "42e01f";
+
 const int kDefaultVp8PlType = 100;
 const int kDefaultVp9PlType = 101;
 const int kDefaultH264PlType = 107;