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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH SDP_ADD_ORIGIN 3COMMPUTIL "June 18, 2021" .SH NAME sdp_add_origin, sdp_add_name, sdp_add_information, sdp_add_uri, sdp_add_email, sdp_add_phone, sdp_add_connection, sdp_add_bandwidth, sdp_add_repeat, sdp_add_time, sdp_add_zone, sdp_add_key, sdp_add_attribute, sdp_add_media \- add specific SDP fields to the SDP session structure .SH SYNOPSIS .nf \fBcc\fR [ \fIflag\fR...] \fIfile\fR... -\fBlcommputil\fR [ \fIlibrary\fR...] #include \fBint\fR \fBsdp_add_origin\fR(\fBsdp_session_t *\fR\fIsession\fR, \fBconst char *\fR\fIname\fR, \fBuint64_t\fR \fIid\fR, \fBuint64_t\fR \fIver\fR, \fBconst char *\fR\fInettype\fR, \fBconst char *\fR\fIaddrtype\fR, \fBconst char *\fR\fIaddress\fR); .fi .LP .nf \fBint\fR sdp_add_name(\fBsdp_session_t *\fR\fIsession\fR, \fBconst char *\fR\fIname\fR); .fi .LP .nf \fBint\fR \fBsdp_add_information\fR(\fBchar **\fR\fIinformation\fR, \fBconst char *\fR\fIvalue\fR); .fi .LP .nf \fBint\fR \fBsdp_add_uri\fR(\fBsdp_session_t *\fR\fIsession\fR, \fBconst char *\fR\fIuri\fR); .fi .LP .nf \fBint\fR \fBsdp_add_email\fR(\fBsdp_session_t *\fR\fIsession\fR, \fBconst char *\fR\fIemail\fR); .fi .LP .nf \fBint\fR \fBsdp_add_phone\fR(\fBsdp_session_t *\fR\fIsession\fR, \fBconst char *\fR\fIphone\fR); .fi .LP .nf \fBint\fR \fBsdp_add_connection\fR(\fBsdp_conn_t **\fR\fIconn\fR, \fBconst char *\fR\fInettype\fR, \fBconst char *\fR\fIaddrtype\fR, \fBconst char *\fR\fIaddress\fR, \fBuint8_t\fR \fIttl\fR, \fBint\fR \fIaddrcount\fR); .fi .LP .nf \fBint\fR \fBsdp_add_bandwidth\fR(\fBsdp_bandwidth_t **\fR\fIbw\fR, \fBconst char *\fR\fItype\fR, \fBuint64_t\fR \fIvalue\fR); .fi .LP .nf \fBint\fR \fBsdp_add_repeat\fR(\fBsdp_time_t *\fR\fItime\fR, \fBuint64_t\fR \fIinterval\fR, \fBuint64_t\fR \fIduration\fR, \fBconst char *\fR\fIoffset\fR); .fi .LP .nf \fBint\fR \fBsdp_add_time\fR(\fBsdp_session_t *\fR\fIsession\fR, \fBuint64_t\fR \fIstarttime\fR, \fBuint64_t\fR \fIstoptime\fR, \fBsdp_time_t **\fR\fItime\fR); .fi .LP .nf \fBint\fR \fBsdp_add_zone\fR(\fBsdp_session_t *\fR\fIsession\fR, \fBuint64_t\fR \fItime\fR, \fBconst char *\fR\fIoffset\fR); .fi .LP .nf \fBint\fR \fBsdp_add_key\fR(\fBsdp_key_t **\fR\fIkey\fR, \fBconst char *\fR\fImethod\fR, \fBconst char *\fR\fIenckey\fR); .fi .LP .nf \fBint\fR \fBsdp_add_attribute\fR(\fBsdp_attr_t **\fR\fIattr\fR, \fBconst char *\fR\fIname\fR, \fBconst char *\fR\fIvalue\fR); .fi .LP .nf \fBint\fR \fBsdp_add_media\fR(\fBsdp_session_t *\fR\fIsession\fR, \fBconst char *\fR\fIname\fR, \fBuint_t\fR \fIport\fR, \fBint\fR \fIportcount\fR, \fBconst char *\fR\fIprotocol\fR, \fBconst char *\fR\fIformat\fR, \fBsdp_media_t **\fR\fImedia\fR); .fi .SH DESCRIPTION The caller has to first call \fBsdp_new_session\fR(3COMMPUTIL) and get pointer to a session structure. Then that pointer is used as argument in the following functions and the session structure is constructed. Once the structure is built the caller converts it to a string representation using \fBsdp_session_to_str\fR(3COMMPUTIL). .sp .LP The \fBsdp_add_origin()\fR function adds ORIGIN (o=) SDP field to the session structure (\fBsdp_session_t\fR) using \fIname\fR, \fIid\fR, \fIver\fR, \fInettype\fR, \fIaddrtype\fR, and \fIaddress\fR. .sp .LP The \fBsdp_add_name()\fR function adds NAME (s=) SDP field to the session structure (\fBsdp_session_t\fR) using \fIname\fR. .sp .LP The \fBsdp_add_information()\fR function adds INFO (i=) SDP field to the session structure (sdp_session_t) or media structure (\fBsdp_media_t\fR) using value. Since this field can be either in the media section or the session section of an SDP description the caller has to pass &\fIsession\fR\(->\fBs_info\fR or &\fImedia\fR\(->\fBm_info\fR as the first argument. .sp .LP The \fBsdp_add_uri()\fR function adds URI (u=) SDP field to the session structure (\fBsdp_session_t\fR) using \fIuri\fR. .sp .LP The \fBsdp_add_email()\fR function adds EMAIL (e=) SDP field to the session structure (\fBsdp_session_t\fR) using \fIemail\fR. .sp .LP The \fBsdp_add_phone()\fR function adds PHONE (p=) SDP field to the session structure (\fBsdp_session_t\fR) using \fIphone\fR. .sp .LP The \fBsdp_add_connection()\fR function adds CONNECTION (c=) SDP field to the session structure (\fBsdp_session_t\fR) or the media structure (\fBsdp_media_t\fR) using \fInettype\fR, \fIaddrtype\fR, \fIaddress\fR, \fIttl\fR, and \fIaddrcount\fR. While adding an IP4 or IP6 unicast address the \fIttl\fR and \fIaddrcount\fR should be set to 0. For multicast address the \fIttl\fR should be set a reasonable value (0 - 255) and \fIaddrcount\fR cannot be 0. Also since this field can be either in the media section or the session section of an SDP description, the caller has to pass &\fIsession\fR\(->\fBs_conn\fR or &\fImedia\fR\(->\fBm_conn\fR as the first argument. .sp .LP The \fBsdp_add_bandwidth()\fR function adds BANDWIDTH (b=) SDP field to the session structure (\fBsdp_session_t\fR) or the media structure (\fBsdp_media_t\fR) using \fItype\fR and \fIvalue\fR. Since this field can be either in the media section or the session section of an SDP description, the caller has to pass &\fBsession\fR\(->\fBs_bw\fR or &\fBmedia\fR\(->\fBm_bw\fR as the first argument. .sp .LP The \fBsdp_add_time()\fR function adds the TIME (t=) SDP field to the session structure using \fIstarttime\fR and \fIstoptime\fR. The pointer to the newly created time structure is returned in \fItime\fR. This pointer is then used in \fBsdp_add_repeat()\fR function. .sp .LP The \fBsdp_add_repeat()\fR function adds the REPEAT (r=) SDP field to the session structure using interval, duration and offset. Here, offset is a string holding one or more offset values, for example "60" or "60 1d 3h". .sp .LP The \fBsdp_add_zone()\fR function adds the ZONE (z=) SDP field to the session structure using \fItime\fR and \fIoffset\fR. To add multiple time and offset values in a single zone field, call this function once for each pair. See the example below. .sp .LP The \fBsdp_add_key()\fR function adds the KEY (k=) SDP field to the session structure (\fBsdp_session_t\fR) or media structure (\fBsdp_media_t\fR) using \fImethod\fR and \fIenckey\fR. Since this field can be either in the media section or the session section of an SDP description, the caller has to pass &\fIsession\fR\(->\fBs_key\fR or &\fImedia\fR\(->\fBm_key\fR as the first argument. .sp .LP The \fBsdp_add_attribute()\fR function adds the ATTRIBUTE (a=) SDP field to the session structure (\fBsdp_session_t\fR) or media structure (\fBsdp_media_t\fR) using \fIname\fR and \fIvalue\fR. Since this field can be either in the media section or the session section of an SDP description, the caller has to pass &\fIsession\fR\(->\fBs_attr\fR or &\fImedia\fR\(->\fBm_attr\fR as the first argument. .sp .LP The \fBsdp_add_media()\fR function adds the MEDIA (m=) SDP field to the session structure (\fBsdp_session_t\fR) using \fIname\fR, \fIport\fR, \fIportcount\fR, \fIprotocol\fR, and \fIformat\fR. Here, \fIformat\fR is a string holding possibly more than one value, for example, "0 31 32 97". The pointer to the newly created media structure is returned in \fImedia\fR. This pointer is then used to add SDP fields specific to that media section. .SH RETURN VALUES These functions return 0 on success and the appropriate error value on failure. The value of \fBerrno\fR is not changed by these calls in the event of an error. .SH ERRORS These functions will fail if: .sp .ne 2 .na \fB\fBEINVAL\fR\fR .ad .RS 10n Mandatory parameters are not provided (they are null). .RE .sp .ne 2 .na \fB\fBENOMEM\fR\fR .ad .RS 10n The allocation of memory failed. .RE .SH EXAMPLES \fBExample 1 \fRBuild an SDP session structure .sp .LP In the following example we see how to build an SDP session structure using the functions described on this manual page. We first get a pointer to \fBsdp_session_t\fR structure by calling \fBsdp_new_session()\fR. Then to this newly created structure we add various SDP fields. Once the structure is built we obtain a string representation of the structure using \fBsdp_session_to_str()\fR function. Since its caller responsibility to free the session we call \fBsdp_free_session()\fR towards the end. .sp .in +2 .nf /* SDP Message we will be building "v=0\er\en\e o=Alice 2890844526 2890842807 IN IP4 10.47.16.5\er\en\e s=-\er\en\e i=A Seminar on the session description protocol\er\en\e u=http://www.example.com/seminars/sdp.pdf\er\en\e e=alice@example.com (Alice Smith)\er\en\e p=+1 911-345-1160\er\en\e c=IN IP4 10.47.16.5\er\en\e b=CT:1024\er\en\e t=2854678930 2854679000\er\en\e r=604800 3600 0 90000\er\en\e z=2882844526 -1h 2898848070 0h\er\en\e a=recvonly\er\en\e m=audio 49170 RTP/AVP 0\er\en\e i=audio media\er\en\e b=CT:1000\er\en\e k=prompt\er\en\e m=video 51372 RTP/AVP 99 90\er\en\e i=video media\er\en\e a=rtpmap:99 h232-199/90000\er\en\e a=rtpmap:90 h263-1998/90000\er\en" */ #include #include #include #include int main () { sdp_session_t *my_sess; sdp_media_t *my_media; sdp_time_t *my_time; char *b_sdp; my_sess = sdp_new_session(); if (my_sess == NULL) { return (ENOMEM); } my_sess->version = 0; if (sdp_add_name(my_sess, "-") != 0) goto err_ret; if (sdp_add_origin(my_sess, "Alice", 2890844526ULL, 2890842807ULL, "IN", "IP4", "10.47.16.5") != 0) goto err_ret; if (sdp_add_information(&my_sess->s_info, "A Seminar on the session" "description protocol") != 0) goto err_ret; if (sdp_add_uri (my_sess, "http://www.example.com/seminars/sdp.pdf") != 0) goto err_ret; if (sdp_add_email(my_sess, "alice@example.com (Alice smith)") != 0) goto err_ret; if (sdp_add_phone(my_sess, "+1 911-345-1160") != 0) goto err_ret; if (sdp_add_connection(&my_sess->s_conn, "IN", "IP4", "10.47.16.5", 0, 0) != 0) goto err_ret; if (sdp_add_bandwidth(&my_sess->s_bw, "CT", 1024) != 0) goto err_ret; if (sdp_add_time(my_sess, 2854678930ULL, 2854679000ULL, &my_time) != 0) goto err_ret; if (sdp_add_repeat(my_time, 604800ULL, 3600ULL, "0 90000") != 0) goto err_ret; if (sdp_add_zone(my_sess, 2882844526ULL, "-1h") != 0) goto err_ret; if (sdp_add_zone(my_sess, 2898848070ULL, "0h") != 0) goto err_ret; if (sdp_add_attribute(&my_sess->s_attr, "sendrecv", NULL) != 0) goto err_ret; if (sdp_add_media(my_sess, "audio", 49170, 1, "RTP/AVP", "0", &my_media) != 0) goto err_ret; if (sdp_add_information(&my_media->m_info, "audio media") != 0) goto err_ret; if (sdp_add_bandwidth(&my_media->m_bw, "CT", 1000) != 0) goto err_ret; if (sdp_add_key(&my_media->m_key, "prompt", NULL) != 0) goto err_ret; if (sdp_add_media(my_sess, "video", 51732, 1, "RTP/AVP", "99 90", &my_media) != 0) goto err_ret; if (sdp_add_information(&my_media->m_info, "video media") != 0) goto err_ret; if (sdp_add_attribute(&my_media->m_attr, "rtpmap", "99 h232-199/90000") != 0) goto err_ret; if (sdp_add_attribute(&my_media->m_attr, "rtpmap", "90 h263-1998/90000") != 0) goto err_ret; b_sdp = sdp_session_to_str(my_sess, &error); /* * b_sdp is the string representation of my_sess structure */ free(b_sdp); sdp_free_session(my_sess); return (0); err_ret: free(b_sdp); sdp_free_session(my_sess); return (1); } .fi .in -2 .SH ATTRIBUTES See \fBattributes\fR(7) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level Safe .TE .SH SEE ALSO .BR sdp_new_session (3COMMPUTIL), .BR sdp_parse (3COMMPUTIL), .BR sdp_session_to_str (3COMMPUTIL), .BR libcommputil (3LIB), .BR attributes (7)