[Live-devel] where can i get dynamic payload type's implementation mechanism

[Ross Finlayson]

At 10:38 PM 11/17/2005, you wrote:
>Hi£º
>      I am study RTSP,RTP,RTCP for some days. when the payload type's
>is dynamic, where could i get the doc for description it.
>          for example: when I use helix to streaming MP3 file, it use
>X-MP3-draft-00.
>where could i get document about X-MP3-draft-00 protocol.

The issue is not that this RTP payload type is 
'dynamic' (all RTP payload types defined in the 
last few years are dynamic).  The issue is that 
the "audio/X-MP3-draft-00" MIME type is a 
proprietary hack, defined only by 
RealNetworks.  If you want a document that 
defines it, you'll have to ask RealNetworks.

However, in this case, the "audio/X-MP3-draft-00" 
MIME type is a RTP payload format that's similar 
to the (IETF standards track) RFC 3119 payload 
format, except that (i) there is only one ADU 
frame in each RTP packet, and (ii) there is no 
special header in the RTP packet.

The "LIVE555 Streaming Media" code is able to 
handle this payload format (by converting the 
incoming data to regular MP3 frames).  See "MediaSession.cpp".


	Ross Finlayson
	Live Networks, Inc. (LIVE555.COM)
	<http://www.live555.com/>