An idea for specifying RTX, FEC, and RED payload types

They aren't real codecs, so it's kind of ugly going in "codecs", and it
isn't completely obvious that doing so is necessary.  It's also not obvious
to use "APT" in an RTX "codec", not to mention that it's also kind of ugly.


So, perhaps we could do something like this:

dictionary RTCRtpParameters {
   DOMString                       muxId = "";
   sequence<RTCRtpCodecParameters> codecs;

*   payloadtype                     redPayloadType;   payloadtype
          fecPayloadType;*
   ...
};

dictionary RTCRtpCodecParameters {
   DOMString   name;
   payloadtype payloadType;
*   payloadtype rtxPayloadType;*
   ...
};

​
Note that this does not tell the browser to send RTX, FEC, or RED.  To do
so, one must put in the correct per-encoding control points under
RtpEncodingParameters.  This merely specifies the payload types to send or
receive
​ in a way that's a little cleaner and more obvious than putting them in
the list of RtpCodecParameters.​


Thoughts?​
​