Hi,
Well an SDP header can contain multiple sessions and each session can contain
multiple streams ( video,voice, etc).
Example of an SDP containing a single session called "SDP Seminar" and
containing 3 media streams ( # are comments, they are not in the RFC ).
v=0
o=mhandley 2890844526 2890842807 IN IP4 126.16.64.4
s=SDP Seminar # session name
i=A Seminar on the session description protocol
u=http://www.cs.ucl.ac.uk/staff/M.Handley/sdp.03.ps
[email protected] (Mark Handley)
c=IN IP4 224.2.17.12/127
t=2873397496 2873404696
a=recvonly
m=audio 49170 RTP/AVP 0 #first media called audio
m=video 51372 RTP/AVP 31 #second media called video
m=application 32416 udp wb #third media called application
a=orient:portrait
If you know which session you want to look at you can use the session name,
and each stream has a name but in general it is quite difficult to distinguish
amongst them.
>From sdp_stream_cell in sdp.h:
str media; //represents media name
str port;
str transport;
str payloads; //represents the list of codecs
int payloads_num;
struct sdp_payload_attr *payload_attr; //represents the lists of a=
lines
When I wrote code to modify the SDP header I simply modified all streams in all
sessions because it was to difficult to distinguish amongst them.
The code is in modules/textops/codecs.c if you find it useful.
Andrei.
>
> Hello,
>
> I'm trying to investigate the media type inside the SDP
> header, when I
> had a look at the structure of SDP inside sdp.h, I found
> that:
> sdp_info contains a list of sessions and each session is
> constituted
> of more than one stream which contains the media header
> field.
> So, how can I reach the real type of media?
> Thank you very much.
>
> Regards.
>
>
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