3 Copyright (C) 2010 Simon MORLAT (simon.morlat@free.fr)
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include <eXosip2/eXosip.h>
25 #define keywordcmp(key,b) strncmp(key,b,sizeof(key))
29 static char *make_relay_session_id(const char *username, const char *relay){
30 /*ideally this should be a hash of the parameters with a random part*/
34 long long int res=((long long int)s1)<<32 | (long long int) s2;
36 b64_encode(src, sizeof(long long int), tmp, sizeof(tmp));
37 return osip_strdup(tmp);
41 static void add_relay_info(sdp_message_t *sdp, int mline, const char *relay, const char *relay_session_id){
43 if (relay) sdp_message_a_attribute_add(sdp, mline,
44 osip_strdup ("relay-addr"),osip_strdup(relay));
45 if (relay_session_id) sdp_message_a_attribute_add(sdp, mline,
46 osip_strdup ("relay-session-id"), osip_strdup(relay_session_id));
51 static char * int_2char(int a){
52 char *p=osip_malloc(16);
53 snprintf(p,16,"%i",a);
57 /* return the value of attr "field" for payload pt at line pos (field=rtpmap,fmtp...)*/
58 static const char *sdp_message_a_attr_value_get_with_pt(sdp_message_t *sdp,int pos,int pt,const char *field)
60 int i,tmppt=0,scanned=0;
62 sdp_attribute_t *attr;
63 for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
64 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
65 int nb = sscanf(attr->a_att_value,"%i %n",&tmppt,&scanned);
66 /* the return value may depend on how %n is interpreted by the libc: see manpage*/
67 if (nb == 1 || nb==2 ){
69 tmp=attr->a_att_value+scanned;
73 }else ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
80 /* return the value of attr "field" */
81 static const char *sdp_message_a_attr_value_get(sdp_message_t *sdp,int pos,const char *field)
84 sdp_attribute_t *attr;
85 for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
86 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
87 return attr->a_att_value;
94 static int _sdp_message_get_a_ptime(sdp_message_t *sdp, int mline){
96 sdp_attribute_t *attr;
97 for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
98 if (keywordcmp("ptime",attr->a_att_field)==0){
99 int nb = sscanf(attr->a_att_value,"%i",&ret);
100 /* the return value may depend on how %n is interpreted by the libc: see manpage*/
103 }else ms_warning("sdp has a strange a=ptime line (%s) ",attr->a_att_value);
109 static sdp_message_t *create_generic_sdp(const SalMediaDescription *desc)
111 sdp_message_t *local;
114 sdp_message_init (&local);
115 if (strchr(desc->addr,':')!=NULL){
118 sdp_message_v_version_set (local, osip_strdup ("0"));
119 sdp_message_o_origin_set (local, osip_strdup (desc->username),
120 osip_strdup ("123456"), osip_strdup ("654321"),
121 osip_strdup ("IN"), inet6 ? osip_strdup("IP6") : osip_strdup ("IP4"),
122 osip_strdup (desc->addr));
123 sdp_message_s_name_set (local, osip_strdup ("A conversation"));
124 sdp_message_c_connection_add (local, -1,
125 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
126 osip_strdup (desc->addr), NULL, NULL);
127 sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
133 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt)
136 sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
138 snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
139 pt->mime_type, pt->clock_rate,pt->channels);
141 snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
142 pt->mime_type, pt->clock_rate);
143 sdp_message_a_attribute_add (msg, line,
144 osip_strdup ("rtpmap"), osip_strdup(attr));
146 if (pt->recv_fmtp != NULL)
148 snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
149 sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
155 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc){
156 const char *mt=desc->type==SalAudio ? "audio" : "video";
160 if (desc->candidates[0].addr[0]!='\0'){
161 addr=desc->candidates[0].addr;
162 port=desc->candidates[0].port;
167 /*only add a c= line within the stream description if address are differents*/
168 if (strcmp(addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
170 if (strchr(addr,':')!=NULL){
173 sdp_message_c_connection_add (msg, lineno,
174 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
175 osip_strdup (addr), NULL, NULL);
177 sdp_message_m_media_add (msg, osip_strdup (mt),
178 int_2char (port), NULL,
179 osip_strdup ("RTP/AVP"));
180 if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
181 int_2char(desc->bandwidth));
182 if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
183 int_2char(desc->ptime));
184 for(elem=desc->payloads;elem!=NULL;elem=elem->next){
185 add_payload(msg, lineno, (PayloadType*)elem->data);
189 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc){
191 sdp_message_t *msg=create_generic_sdp(desc);
192 for(i=0;i<desc->nstreams;++i){
193 add_line(msg,i,&desc->streams[i]);
198 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
200 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
202 pt->mime_type=ms_strdup(refpt->mime_type);
203 pt->clock_rate=refpt->clock_rate;
205 ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
206 payload_type_get_number(pt));
210 char *mime=ms_strdup(rtpmap);
211 char *p=strchr(mime,'/');
220 pt->channels=atoi(chans);
221 }else pt->channels=1;
222 pt->clock_rate=atoi(p);
229 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc){
231 const char *mtype,*proto,*port,*addr,*number;
232 sdp_bandwidth_t *sbw=NULL;
234 addr=sdp_message_c_addr_get (msg, -1, 0);
236 strncpy(desc->addr,addr,sizeof(desc->addr));
237 /* for each m= line */
238 for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
240 SalStreamDescription *stream=&desc->streams[i];
242 memset(stream,0,sizeof(*stream));
243 mtype = sdp_message_m_media_get(msg, i);
244 proto = sdp_message_m_proto_get (msg, i);
245 port = sdp_message_m_port_get(msg, i);
246 stream->proto=SalProtoUnknown;
248 if (strcasecmp(proto,"RTP/AVP")==0)
249 stream->proto=SalProtoRtpAvp;
250 else if (strcasecmp(proto,"RTP/SAVP")==0){
251 stream->proto=SalProtoRtpSavp;
254 addr = sdp_message_c_addr_get (msg, i, 0);
256 strncpy(stream->addr,addr,sizeof(stream->addr));
258 stream->port=atoi(port);
260 stream->ptime=_sdp_message_get_a_ptime(msg,i);
261 if (strcasecmp("audio", mtype) == 0){
262 stream->type=SalAudio;
263 }else if (strcasecmp("video", mtype) == 0){
264 stream->type=SalVideo;
265 }else stream->type=SalOther;
266 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
267 if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
269 /* for each payload type */
270 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
271 const char *rtpmap,*fmtp;
272 int ptn=atoi(number);
273 PayloadType *pt=payload_type_new();
274 payload_type_set_number(pt,ptn);
275 /* get the rtpmap associated to this codec, if any */
276 rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
277 payload_type_fill_from_rtpmap(pt,rtpmap);
278 /* get the fmtp, if any */
279 fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
280 payload_type_set_send_fmtp(pt,fmtp);
281 stream->payloads=ms_list_append(stream->payloads,pt);
282 ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
283 pt->send_fmtp ? pt->send_fmtp : "");