//return M4BadParam if invalid structure, M4SignalingFailure if bad formatting
//or M4OK
M4Err SDP_CheckInfo(SDPInfo *sdp)
{
M4Err e;
u32 i, j;
SDPMedia *media;
SDPConnection *conn;
SDP_RTPMap *map;
Bool HasGlobalConnection, HasSeveralPorts;
if (!sdp || !sdp->media_desc || !sdp->Attributes) return M4BadParam;
//we force at least one media per SDP
if (!ChainGetCount(sdp->media_desc)) return M4SignalingFailure;
//normative fields
//o=
if (!sdp->o_add_type || !sdp->o_address || !sdp->o_username || !sdp->o_session_id || !sdp->o_version)
return M4SignalingFailure;
//s=
if (!sdp->s_session_name) return M4SignalingFailure;
//t=
// if () return M4SignalingFailure;
//c=
if (sdp->c_connection) {
e = SDP_CheckConnection(sdp->c_connection);
if (e) return e;
//multiple addresses are only for media desc
if (sdp->c_connection->add_count >= 2) return M4SignalingFailure;
HasGlobalConnection = 1;
} else {
HasGlobalConnection = 0;
}
//then check all media
for (i=0; i<ChainGetCount(sdp->media_desc); i++) {
media = ChainGetEntry(sdp->media_desc, i);
HasSeveralPorts = 0;
//m= : force non-null port, profile and fmt_list
if (!media->PortNumber || !media->Profile) return M4SignalingFailure;
if (media->NumPorts) HasSeveralPorts = 1;
//no connections specified - THIS IS AN ERROR IN SDP BUT NOT IN ALL RTSP SESSIONS...
// if (!HasGlobalConnection && !ChainGetCount(media->Connections)) return M4SignalingFailure;
//too many connections specified
if (HasGlobalConnection && ChainGetCount(media->Connections)) return M4SignalingFailure;
//check all connections, and make sure we don't have multiple addresses
//and multiple ports at the same time
if (ChainGetCount(media->Connections)>1 && HasSeveralPorts) return M4SignalingFailure;
for (j=0; j<ChainGetCount(media->Connections); j++) {
conn = ChainGetEntry(media->Connections, j);
e = SDP_CheckConnection(conn);
if (e) return e;
if ((conn->add_count >= 2) && HasSeveralPorts) return M4SignalingFailure;
}
//RTPMaps. 0 is tolerated, but if some are specified check them
for (j=0; j<ChainGetCount(media->RTPMaps); j++) {
map = ChainGetEntry(media->RTPMaps, j);
//RFC2327 is not clear here, but we assume the PayloadType should be a DYN one
//however this depends on the profile (RTP/AVP or others) so don't check it
//ClockRate SHALL NOT be NULL
if (!map->payload_name || !map->ClockRate) return M4SignalingFailure;
}
}
//Encryption: nothing tells wether the scope of the global key is eclusive or not.
//we accept a global key + keys per media entry, assuming that the media key primes
//on the global key
return M4OK;
}
//return GF_BAD_PARAM if invalid structure, GF_REMOTE_SERVICE_ERROR if bad formatting
//or GF_OK
GF_EXPORT
GF_Err gf_sdp_info_check(GF_SDPInfo *sdp)
{
GF_Err e;
u32 i, j, count;
GF_SDPMedia *media;
GF_SDPConnection *conn;
GF_RTPMap *map;
Bool HasGlobalConnection, HasSeveralPorts;
if (!sdp || !sdp->media_desc || !sdp->Attributes) return GF_BAD_PARAM;
//we force at least one media per SDP
if (!gf_list_count(sdp->media_desc)) return GF_REMOTE_SERVICE_ERROR;
//normative fields
//o=
if (!sdp->o_add_type || !sdp->o_address || !sdp->o_username || !sdp->o_session_id || !sdp->o_version)
return GF_REMOTE_SERVICE_ERROR;
//s=
//commented for intermedia demos
// if (!sdp->s_session_name) return GF_REMOTE_SERVICE_ERROR;
//t=
// if () return GF_REMOTE_SERVICE_ERROR;
//c=
if (sdp->c_connection) {
e = SDP_CheckConnection(sdp->c_connection);
if (e) return e;
//multiple addresses are only for media desc
if (sdp->c_connection->add_count >= 2) return GF_REMOTE_SERVICE_ERROR;
HasGlobalConnection = 1;
} else {
HasGlobalConnection = 0;
}
//then check all media
i=0;
while ((media = (GF_SDPMedia*)gf_list_enum(sdp->media_desc, &i))) {
HasSeveralPorts = 0;
//m= : force non-null port, profile and fmt_list
if (/*!media->PortNumber || */ !media->Profile) return GF_REMOTE_SERVICE_ERROR;
if (media->NumPorts) HasSeveralPorts = 1;
//no connections specified - THIS IS AN ERROR IN SDP BUT NOT IN ALL RTSP SESSIONS...
// if (!HasGlobalConnection && !gf_list_count(media->Connections)) return GF_REMOTE_SERVICE_ERROR;
//too many connections specified
if (HasGlobalConnection && gf_list_count(media->Connections)) return GF_REMOTE_SERVICE_ERROR;
//check all connections, and make sure we don't have multiple addresses
//and multiple ports at the same time
count = gf_list_count(media->Connections);
if (count>1 && HasSeveralPorts) return GF_REMOTE_SERVICE_ERROR;
for (j=0; j<count; j++) {
conn = (GF_SDPConnection*)gf_list_get(media->Connections, j);
e = SDP_CheckConnection(conn);
if (e) return e;
if ((conn->add_count >= 2) && HasSeveralPorts) return GF_REMOTE_SERVICE_ERROR;
}
//RTPMaps. 0 is tolerated, but if some are specified check them
j=0;
while ((map = (GF_RTPMap*)gf_list_enum(media->RTPMaps, &j))) {
//RFC2327 is not clear here, but we assume the PayloadType should be a DYN one
//however this depends on the profile (RTP/AVP or others) so don't check it
//ClockRate SHALL NOT be NULL
if (!map->payload_name || !map->ClockRate) return GF_REMOTE_SERVICE_ERROR;
}
}
//Encryption: nothing tells wether the scope of the global key is eclusive or not.
//we accept a global key + keys per media entry, assuming that the media key primes
//on the global key
return GF_OK;
}
