The sdp_find_attribute() function searches the attribute list that is specified by the attr parameter for the attribute name that is specified by the name parameter.
Return Values: The sdp_find_attribute() function returns a pointer to the attribute (sdp_attr_t *) that is specified by the name parameter when the function completes successfully. In all other cases, the sdp_find_attribute() function returns a value of NULL.
The incomplete SDP description in this example has an audio section.
m=audio 49170 RTP/AVP 0 8 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=sendonly a=ptime:10000 a=maxptime:20000 /* * Assuming that above description is parsed using sdp_parse and that * the parsed structure is in "session" sdp_session_t structure. */ sdp_attr_t *ptime; sdp_attr_t *max_ptime; sdp_media_t *media = session->s_media; if ((ptime = sdp_find_attribute(media->m_attr, "ptime")) == NULL) /* ptime attribute not present */ else if((max_ptime = sdp_find_attribute(media->m_attr, "maxptime")) == NULL) /* max_ptime attribute not present */