Finding Media in an SDP Session Structure

The sdp_find_media() function searches the media list that is specified by the media parameter for the media entry that is specified by the name parameter.

Return Values: The sdp_find_media() function returns a pointer to the media list entry (sdp_media_t *) that is specified by the name parameter when the function completes successfully. In all other cases, the sdp_find_media() function returns a value of NULL.

Example 3–3 Using the sdp_find_media() Function

The incomplete SDP description in this example has two sections, an audio section and a video section.

m=audio 49170 RTP/AVP 0 8
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
m=video 51372 RTP/AVP 31 32
a=rtpmap:31 H261/90000
a=rtpmap:32 MPV/90000

/*
* Assuming that above description is parsed using sdp_parse() and that
* the parsed structure is in "session" sdp_session_t structure.
*/

sdp_media_t     *my_media;
my_media = sdp_find_media(session->s_media, "video");

/*
* my_media now points to the structure containg video media section
* information
*/