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 "ortp/ortp_srtp.h"
  23 #include "sal.h"
  24 #include <eXosip2/eXosip.h>
  25
  26 #define keywordcmp(key,b) strncmp(key,b,sizeof(key))
  27
  28 #ifdef FOR_LATER
  29
  30 static char *make_relay_session_id(const char *username, const char *relay){
  31         /*ideally this should be a hash of the parameters with a random part*/
  32         char tmp[128];
  33         int s1=(int)random();
  34         int s2=(int)random();
  35         long long int res=((long long int)s1)<<32 | (long long int) s2;
  36         void *src=&res;
  37         b64_encode(src, sizeof(long long int), tmp, sizeof(tmp));
  38         return osip_strdup(tmp);
  39 }
  40
  41
  42 static void add_relay_info(sdp_message_t *sdp, int mline, const char *relay, const char *relay_session_id){
  43
  44         if (relay) sdp_message_a_attribute_add(sdp, mline,
  45                                      osip_strdup ("relay-addr"),osip_strdup(relay));
  46         if (relay_session_id) sdp_message_a_attribute_add(sdp, mline,
  47                                      osip_strdup ("relay-session-id"), osip_strdup(relay_session_id));
  48 }
  49
  50 #endif
  51
  52 static char * int_2char(int a){
  53         char *p=osip_malloc(16);
  54         snprintf(p,16,"%i",a);
  55         return p;
  56 }
  57
  58 /* return the value of attr "field" for payload pt at line pos (field=rtpmap,fmtp...)*/
  59 static const char *sdp_message_a_attr_value_get_with_pt(sdp_message_t *sdp,int pos,int pt,const char *field)
  60 {
  61         int i,tmppt=0,scanned=0;
  62         char *tmp;
  63         sdp_attribute_t *attr;
  64         for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
  65                 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
  66                         int nb = sscanf(attr->a_att_value,"%i %n",&tmppt,&scanned);
  67                         /* the return value may depend on how %n is interpreted by the libc: see manpage*/
  68                         if (nb == 1 || nb==2 ){
  69                                 if (pt==tmppt){
  70                                         tmp=attr->a_att_value+scanned;
  71                                         if (strlen(tmp)>0)
  72                                                 return tmp;
  73                                 }
  74                         }else ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
  75                 }
  76         }
  77         return NULL;
  78 }
  79
  80 #ifdef FOR_LATER
  81 /* return the value of attr "field" */
  82 static const char *sdp_message_a_attr_value_get(sdp_message_t *sdp,int pos,const char *field)
  83 {
  84         int i;
  85         sdp_attribute_t *attr;
  86         for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
  87                 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
  88                         return attr->a_att_value;
  89                 }
  90         }
  91         return NULL;
  92 }
  93 #endif
  94
  95 static int _sdp_message_get_a_ptime(sdp_message_t *sdp, int mline){
  96         int i,ret;
  97         sdp_attribute_t *attr;
  98         for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
  99                 if (keywordcmp("ptime",attr->a_att_field)==0){
 100                         int nb = sscanf(attr->a_att_value,"%i",&ret);
 101                         /* the return value may depend on how %n is interpreted by the libc: see manpage*/
 102                         if (nb == 1){
 103                                 return ret;
 104                         }else ms_warning("sdp has a strange a=ptime line (%s) ",attr->a_att_value);
 105                 }
 106         }
 107         return 0;
 108 }
 109
 110 static int _sdp_message_get_mline_dir(sdp_message_t *sdp, int mline){
 111         int i;
 112         sdp_attribute_t *attr;
 113         for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
 114                 if (keywordcmp("sendrecv",attr->a_att_field)==0){
 115                         return SalStreamSendRecv;
 116                 }else if (keywordcmp("sendonly",attr->a_att_field)==0){
 117                         return SalStreamSendOnly;
 118                 }else if (keywordcmp("recvonly",attr->a_att_field)==0){
 119                         return SalStreamSendOnly;
 120                 }else if (keywordcmp("inactive",attr->a_att_field)==0){
 121                         return SalStreamInactive;
 122                 }
 123         }
 124         return SalStreamSendRecv;
 125 }
 126
 127 static sdp_message_t *create_generic_sdp(const SalMediaDescription *desc)
 128 {
 129         sdp_message_t *local;
 130         int inet6;
 131         char sessid[16];
 132         char sessver[16];
 133
 134         snprintf(sessid,16,"%i",desc->session_id);
 135         snprintf(sessver,16,"%i",desc->session_ver);
 136         sdp_message_init (&local);
 137         if (strchr(desc->addr,':')!=NULL){
 138                 inet6=1;
 139         }else inet6=0;
 140         sdp_message_v_version_set (local, osip_strdup ("0"));
 141         sdp_message_o_origin_set (local, osip_strdup (desc->username),
 142                           osip_strdup (sessid), osip_strdup (sessver),
 143                           osip_strdup ("IN"), inet6 ? osip_strdup("IP6") : osip_strdup ("IP4"),
 144                           osip_strdup (desc->addr));
 145         sdp_message_s_name_set (local, osip_strdup ("Talk"));
 146         if(!sal_media_description_has_dir (desc,SalStreamSendOnly))
 147         {
 148                 sdp_message_c_connection_add (local, -1,
 149                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 150                                                 osip_strdup (desc->addr), NULL, NULL);
 151         }
 152         else
 153         {
 154                 sdp_message_c_connection_add (local, -1,
 155                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 156                                                 inet6 ? osip_strdup ("::0") : osip_strdup ("0.0.0.0"), NULL, NULL);
 157         }
 158         sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
 159         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (local, -1, osip_strdup ("AS"),
 160                         int_2char(desc->bandwidth));
 161         return local;
 162 }
 163
 164
 165 static bool_t is_known_rtpmap(const PayloadType *pt){
 166         switch(payload_type_get_number(pt)){
 167                 case 0:
 168                 case 8:
 169                 case 3:
 170                 case 34:
 171                         return TRUE;
 172         }
 173         return FALSE;
 174 }
 175
 176 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt, bool_t strip_well_known_rtpmaps)
 177 {
 178         char attr[256];
 179         sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
 180
 181         if (!strip_well_known_rtpmaps || !is_known_rtpmap(pt)){
 182                 if (pt->channels>1)
 183                         snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
 184                                         pt->mime_type, pt->clock_rate,pt->channels);
 185                 else
 186                         snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
 187                                         pt->mime_type, pt->clock_rate);
 188                 sdp_message_a_attribute_add (msg, line,
 189                                                  osip_strdup ("rtpmap"), osip_strdup(attr));
 190         }
 191
 192         if (pt->recv_fmtp != NULL)
 193         {
 194                 snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
 195                 sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
 196                                      osip_strdup(attr));
 197         }
 198 }
 199
 200
 201 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc){
 202         const char *mt=NULL;
 203         const MSList *elem;
 204         const char *addr;
 205         const char *dir="sendrecv";
 206         int port;
 207         bool_t strip_well_known_rtpmaps;
 208
 209         switch (desc->type) {
 210         case SalAudio:
 211                 mt="audio";
 212                 break;
 213         case SalVideo:
 214                 mt="video";
 215                 break;
 216         case SalOther:
 217                 mt=desc->typeother;
 218                 break;
 219         }
 220         if (desc->candidates[0].addr[0]!='\0'){
 221                 addr=desc->candidates[0].addr;
 222                 port=desc->candidates[0].port;
 223         }else{
 224                 addr=desc->addr;
 225                 port=desc->port;
 226         }
 227         /*only add a c= line within the stream description if address are differents*/
 228         if (strcmp(addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
 229                 bool_t inet6;
 230                 if (strchr(addr,':')!=NULL){
 231                         inet6=TRUE;
 232                 }else inet6=FALSE;
 233                 sdp_message_c_connection_add (msg, lineno,
 234                               osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 235                               osip_strdup (addr), NULL, NULL);
 236         }
 237         sdp_message_m_media_add (msg, osip_strdup (mt),
 238                                  int_2char (port), NULL,
 239                                  osip_strdup ("RTP/AVP"));
 240         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
 241                                      int_2char(desc->bandwidth));
 242         if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
 243                                 int_2char(desc->ptime));
 244         strip_well_known_rtpmaps=ms_list_size(desc->payloads)>5;
 245         if (desc->payloads){
 246                 for(elem=desc->payloads;elem!=NULL;elem=elem->next){
 247                         add_payload(msg, lineno, (PayloadType*)elem->data,strip_well_known_rtpmaps);
 248                 }
 249         }else{
 250                 /* to comply with SDP we cannot have an empty payload type number list */
 251                 /* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
 252                 sdp_message_m_payload_add (msg,lineno, int_2char (0));
 253         }
 254         switch(desc->dir){
 255                 case SalStreamSendRecv:
 256                         /*dir="sendrecv";*/
 257                         dir=NULL;
 258                 break;
 259                 case SalStreamRecvOnly:
 260                         dir="recvonly";
 261                         break;
 262                 case SalStreamSendOnly:
 263                         dir="sendonly";
 264                         break;
 265                 case SalStreamInactive:
 266                         dir="inactive";
 267                         break;
 268         }
 269         if (dir) sdp_message_a_attribute_add (msg, lineno, osip_strdup (dir),NULL);
 270 }
 271
 272 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc){
 273         int i;
 274         sdp_message_t *msg=create_generic_sdp(desc);
 275         for(i=0;i<desc->nstreams;++i){
 276                 add_line(msg,i,&desc->streams[i]);
 277         }
 278         return msg;
 279 }
 280
 281 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
 282         if (rtpmap==NULL){
 283                 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
 284                 if (refpt){
 285                         pt->mime_type=ms_strdup(refpt->mime_type);
 286                         pt->clock_rate=refpt->clock_rate;
 287                 }else{
 288                         ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
 289                             payload_type_get_number(pt));
 290                         return -1;
 291                 }
 292         }else{
 293                 char *mime=ms_strdup(rtpmap);
 294                 char *p=strchr(mime,'/');
 295                 if (p){
 296                         char *chans;
 297                         *p='\0';
 298                         p++;
 299                         chans=strchr(p,'/');
 300                         if (chans){
 301                                 *chans='\0';
 302                                 chans++;
 303                                 pt->channels=atoi(chans);
 304                         }else pt->channels=1;
 305                         pt->clock_rate=atoi(p);
 306                 }
 307                 pt->mime_type=mime;
 308         }
 309         return 0;
 310 }
 311
 312 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc){
 313         int i,j;
 314         const char *mtype,*proto,*port,*addr,*number;
 315         sdp_bandwidth_t *sbw=NULL;
 316
 317         addr=sdp_message_c_addr_get (msg, -1, 0);
 318         if (addr)
 319                 strncpy(desc->addr,addr,sizeof(desc->addr));
 320         for(j=0;(sbw=sdp_message_bandwidth_get(msg,-1,j))!=NULL;++j){
 321                 if (strcasecmp(sbw->b_bwtype,"AS")==0) desc->bandwidth=atoi(sbw->b_bandwidth);
 322         }
 323
 324         /* for each m= line */
 325         for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
 326         {
 327                 SalStreamDescription *stream=&desc->streams[i];
 328
 329                 memset(stream,0,sizeof(*stream));
 330                 mtype = sdp_message_m_media_get(msg, i);
 331                 proto = sdp_message_m_proto_get (msg, i);
 332                 port = sdp_message_m_port_get(msg, i);
 333                 stream->proto=SalProtoUnknown;
 334                 if (proto){
 335                         if (strcasecmp(proto,"RTP/AVP")==0)
 336                                 stream->proto=SalProtoRtpAvp;
 337                         else if (strcasecmp(proto,"RTP/SAVP")==0){
 338                                 stream->proto=SalProtoRtpSavp;
 339                         }
 340                 }
 341                 addr = sdp_message_c_addr_get (msg, i, 0);
 342                 if (addr != NULL)
 343                         strncpy(stream->addr,addr,sizeof(stream->addr));
 344                 if (port)
 345                         stream->port=atoi(port);
 346
 347                 stream->ptime=_sdp_message_get_a_ptime(msg,i);
 348                 if (strcasecmp("audio", mtype) == 0){
 349                         stream->type=SalAudio;
 350                 }else if (strcasecmp("video", mtype) == 0){
 351                         stream->type=SalVideo;
 352                 }else {
 353                         stream->type=SalOther;
 354                         strncpy(stream->typeother,mtype,sizeof(stream->typeother)-1);
 355                 }
 356                 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
 357                         if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
 358                 }
 359                 stream->dir=_sdp_message_get_mline_dir(msg,i);
 360                 /* for each payload type */
 361                 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
 362                         const char *rtpmap,*fmtp;
 363                         int ptn=atoi(number);
 364                         PayloadType *pt=payload_type_new();
 365                         payload_type_set_number(pt,ptn);
 366                         /* get the rtpmap associated to this codec, if any */
 367                         rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
 368                         if (payload_type_fill_from_rtpmap(pt,rtpmap)==0){
 369                                 /* get the fmtp, if any */
 370                                 fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
 371                                 payload_type_set_send_fmtp(pt,fmtp);
 372                                 stream->payloads=ms_list_append(stream->payloads,pt);
 373                                 ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
 374                                         pt->send_fmtp ? pt->send_fmtp : "");
 375                         }
 376                 }
 377         }
 378         desc->nstreams=i;
 379         return 0;
 380 }