sjero.net Git - linphone/blob - coreapi/sal_eXosip2_sdp.c

   1 /*
   2 linphone
   3 Copyright (C) 2010  Simon MORLAT (simon.morlat@free.fr)
   4
   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.
   9
  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.
  14
  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.
  18 */
  19
  20
  21 #include "ortp/b64.h"
  22 #include "sal.h"
  23 #include <eXosip2/eXosip.h>
  24
  25 #define keywordcmp(key,b) strncmp(key,b,sizeof(key))
  26
  27 #ifdef FOR_LATER
  28
  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*/
  31         char tmp[128];
  32         int s1=(int)random();
  33         int s2=(int)random();
  34         long long int res=((long long int)s1)<<32 | (long long int) s2;
  35         void *src=&res;
  36         b64_encode(src, sizeof(long long int), tmp, sizeof(tmp));
  37         return osip_strdup(tmp);
  38 }
  39
  40
  41 static void add_relay_info(sdp_message_t *sdp, int mline, const char *relay, const char *relay_session_id){
  42
  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));
  47 }
  48
  49 #endif
  50
  51 static char * int_2char(int a){
  52         char *p=osip_malloc(16);
  53         snprintf(p,16,"%i",a);
  54         return p;
  55 }
  56
  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)
  59 {
  60         int i,tmppt=0,scanned=0;
  61         char *tmp;
  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 ){
  68                                 if (pt==tmppt){
  69                                         tmp=attr->a_att_value+scanned;
  70                                         if (strlen(tmp)>0)
  71                                                 return tmp;
  72                                 }
  73                         }else ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
  74                 }
  75         }
  76         return NULL;
  77 }
  78
  79 #ifdef FOR_LATER
  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)
  82 {
  83         int i;
  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;
  88                 }
  89         }
  90         return NULL;
  91 }
  92 #endif
  93
  94 static int _sdp_message_get_a_ptime(sdp_message_t *sdp, int mline){
  95         int i,ret;
  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*/
 101                         if (nb == 1){
 102                                 return ret;
 103                         }else ms_warning("sdp has a strange a=ptime line (%s) ",attr->a_att_value);
 104                 }
 105         }
 106         return 0;
 107 }
 108
 109 static sdp_message_t *create_generic_sdp(const SalMediaDescription *desc)
 110 {
 111         sdp_message_t *local;
 112         int inet6;
 113
 114         sdp_message_init (&local);
 115         if (strchr(desc->addr,':')!=NULL){
 116                 inet6=1;
 117         }else inet6=0;
 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"));
 128         return local;
 129 }
 130
 131
 132
 133 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt)
 134 {
 135         char attr[256];
 136         sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
 137         if (pt->type==PAYLOAD_AUDIO_CONTINUOUS || pt->type==PAYLOAD_AUDIO_PACKETIZED)
 138                 snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
 139                         pt->mime_type, pt->clock_rate,pt->channels);
 140         else
 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));
 145
 146         if (pt->recv_fmtp != NULL)
 147         {
 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"),
 150                                      osip_strdup(attr));
 151         }
 152 }
 153
 154
 155 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc){
 156         const char *mt=desc->type==SalAudio ? "audio" : "video";
 157         const MSList *elem;
 158         const char *addr;
 159         int port;
 160         if (desc->candidates[0].addr[0]!='\0'){
 161                 addr=desc->candidates[0].addr;
 162                 port=desc->candidates[0].port;
 163         }else{
 164                 addr=desc->addr;
 165                 port=desc->port;
 166         }
 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){
 169                 bool_t inet6;
 170                 if (strchr(addr,':')!=NULL){
 171                         inet6=TRUE;
 172                 }else inet6=FALSE;
 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);
 176         }
 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         for(elem=desc->payloads;elem!=NULL;elem=elem->next){
 183                 add_payload(msg, lineno, (PayloadType*)elem->data);
 184         }
 185 }
 186
 187 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc){
 188         int i;
 189         sdp_message_t *msg=create_generic_sdp(desc);
 190         for(i=0;i<desc->nstreams;++i){
 191                 add_line(msg,i,&desc->streams[i]);
 192         }
 193         return msg;
 194 }
 195
 196 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
 197         if (rtpmap==NULL){
 198                 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
 199                 if (refpt){
 200                         pt->mime_type=ms_strdup(refpt->mime_type);
 201                         pt->clock_rate=refpt->clock_rate;
 202                 }else{
 203                         ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
 204                             payload_type_get_number(pt));
 205                         return -1;
 206                 }
 207         }else{
 208                 char *mime=ms_strdup(rtpmap);
 209                 char *p=strchr(mime,'/');
 210                 if (p){
 211                         char *chans;
 212                         *p='\0';
 213                         p++;
 214                         chans=strchr(p,'/');
 215                         if (chans){
 216                                 *chans='\0';
 217                                 chans++;
 218                                 pt->channels=atoi(chans);
 219                         }else pt->channels=1;
 220                         pt->clock_rate=atoi(p);
 221                 }
 222                 pt->mime_type=mime;
 223         }
 224         return 0;
 225 }
 226
 227 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc){
 228         int i,j;
 229         const char *mtype,*proto,*port,*addr,*number;
 230         sdp_bandwidth_t *sbw=NULL;
 231
 232         addr=sdp_message_c_addr_get (msg, -1, 0);
 233         if (addr)
 234                 strncpy(desc->addr,addr,sizeof(desc->addr));
 235         /* for each m= line */
 236         for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
 237         {
 238                 SalStreamDescription *stream=&desc->streams[i];
 239
 240                 memset(stream,0,sizeof(*stream));
 241                 mtype = sdp_message_m_media_get(msg, i);
 242                 proto = sdp_message_m_proto_get (msg, i);
 243                 port = sdp_message_m_port_get(msg, i);
 244                 stream->proto=SalProtoUnknown;
 245                 if (proto){
 246                         if (strcasecmp(proto,"RTP/AVP")==0)
 247                                 stream->proto=SalProtoRtpAvp;
 248                         else if (strcasecmp(proto,"RTP/SAVP")==0){
 249                                 stream->proto=SalProtoRtpSavp;
 250                         }
 251                 }
 252                 addr = sdp_message_c_addr_get (msg, i, 0);
 253                 if (addr != NULL)
 254                         strncpy(stream->addr,addr,sizeof(stream->addr));
 255                 if (port)
 256                         stream->port=atoi(port);
 257
 258                 stream->ptime=_sdp_message_get_a_ptime(msg,i);
 259                 if (strcasecmp("audio", mtype) == 0){
 260                         stream->type=SalAudio;
 261                 }else if (strcasecmp("video", mtype) == 0){
 262                         stream->type=SalVideo;
 263                 }else stream->type=SalOther;
 264                 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
 265                         if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
 266                 }
 267                 /* for each payload type */
 268                 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
 269                         const char *rtpmap,*fmtp;
 270                         int ptn=atoi(number);
 271                         PayloadType *pt=payload_type_new();
 272                         payload_type_set_number(pt,ptn);
 273                         /* get the rtpmap associated to this codec, if any */
 274                         rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
 275                         payload_type_fill_from_rtpmap(pt,rtpmap);
 276                         /* get the fmtp, if any */
 277                         fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
 278                         payload_type_set_send_fmtp(pt,fmtp);
 279                         stream->payloads=ms_list_append(stream->payloads,pt);
 280                         ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
 281                             pt->send_fmtp ? pt->send_fmtp : "");
 282                 }
 283         }
 284         desc->nstreams=i;
 285         return 0;
 286 }