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 SalStreamRecvOnly;
 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, const IceSession *ice_session)
 128 {
 129         sdp_message_t *local;
 130         int inet6;
 131         char sessid[16];
 132         char sessver[16];
 133         const char *rtp_addr = desc->addr;
 134
 135         snprintf(sessid,16,"%i",desc->session_id);
 136         snprintf(sessver,16,"%i",desc->session_ver);
 137         sdp_message_init (&local);
 138         if (strchr(desc->addr,':')!=NULL){
 139                 inet6=1;
 140         }else inet6=0;
 141         sdp_message_v_version_set (local, osip_strdup ("0"));
 142         sdp_message_o_origin_set (local, osip_strdup (desc->username),
 143                           osip_strdup (sessid), osip_strdup (sessver),
 144                           osip_strdup ("IN"), inet6 ? osip_strdup("IP6") : osip_strdup ("IP4"),
 145                           osip_strdup (desc->addr));
 146         sdp_message_s_name_set (local, osip_strdup ("Talk"));
 147         if ((ice_session != NULL) && (ice_session_check_list(ice_session, 0) != NULL)) {
 148                 if (ice_session_state(ice_session) == IS_Completed) {
 149                         ice_check_list_nominated_valid_local_candidate(ice_session_check_list(ice_session, 0), &rtp_addr, NULL, NULL, NULL);
 150                 }
 151                 else {
 152                         ice_check_list_default_local_candidate(ice_session_check_list(ice_session, 0), &rtp_addr, NULL, NULL, NULL);
 153                 }
 154         }
 155         if(!sal_media_description_has_dir (desc,SalStreamSendOnly))
 156         {
 157                 sdp_message_c_connection_add (local, -1,
 158                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 159                                                 osip_strdup (rtp_addr), NULL, NULL);
 160         }
 161         else
 162         {
 163                 sdp_message_c_connection_add (local, -1,
 164                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 165                                                 inet6 ? osip_strdup ("::0") : osip_strdup ("0.0.0.0"), NULL, NULL);
 166         }
 167         sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
 168         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (local, -1, osip_strdup ("AS"),
 169                         int_2char(desc->bandwidth));
 170         if ((ice_session != NULL) && (ice_session_check_list(ice_session, 0) != NULL)) {
 171                 char buffer[512];
 172                 switch (ice_session_state(ice_session)) {
 173                         case IS_Running:
 174                         case IS_Stopped:
 175                                 snprintf(buffer, sizeof(buffer), "%s", ice_session_local_pwd(ice_session));
 176                                 sdp_message_a_attribute_add(local, -1, osip_strdup("ice-pwd"), osip_strdup(buffer));
 177                                 snprintf(buffer, sizeof(buffer), "%s", ice_session_local_ufrag(ice_session));
 178                                 sdp_message_a_attribute_add(local, -1, osip_strdup("ice-ufrag"), osip_strdup(buffer));
 179                                 break;
 180                         case IS_Completed:
 181                                 sdp_message_a_attribute_add(local, -1, osip_strdup("nortpproxy"), osip_strdup("yes"));
 182                                 break;
 183                         default:
 184                                 break;
 185                 }
 186         }
 187
 188         return local;
 189 }
 190
 191
 192 static bool_t is_known_rtpmap(const PayloadType *pt){
 193         switch(payload_type_get_number(pt)){
 194                 case 0:
 195                 case 8:
 196                 case 3:
 197                 case 34:
 198                         return TRUE;
 199         }
 200         return FALSE;
 201 }
 202
 203 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt, bool_t strip_well_known_rtpmaps)
 204 {
 205         char attr[256];
 206         sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
 207
 208         if (!strip_well_known_rtpmaps || !is_known_rtpmap(pt)){
 209                 if (pt->channels>1)
 210                         snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
 211                                         pt->mime_type, pt->clock_rate,pt->channels);
 212                 else
 213                         snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
 214                                         pt->mime_type, pt->clock_rate);
 215                 sdp_message_a_attribute_add (msg, line,
 216                                                  osip_strdup ("rtpmap"), osip_strdup(attr));
 217         }
 218
 219         if (pt->recv_fmtp != NULL)
 220         {
 221                 snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
 222                 sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
 223                                      osip_strdup(attr));
 224         }
 225 }
 226
 227 static void add_candidate_attribute(sdp_message_t *msg, int lineno, const IceCandidate *candidate)
 228 {
 229         char buffer[1024];
 230         int nb;
 231
 232         nb = snprintf(buffer, sizeof(buffer), "%s %d UDP %d %s %d typ %s",
 233                 candidate->foundation, candidate->componentID, candidate->priority, candidate->taddr.ip, candidate->taddr.port, ice_candidate_type(candidate));
 234         if (nb < 0) {
 235                 ms_error("Cannot add ICE candidate attribute!");
 236                 return;
 237         }
 238         if (candidate->type != ICT_HostCandidate) {
 239                 nb = snprintf(buffer + nb, sizeof(buffer) - nb, " raddr %s rport %d", candidate->base->taddr.ip, candidate->base->taddr.port);
 240                 if (nb < 0) {
 241                         ms_error("Cannot add ICE candidate attribute!");
 242                         return;
 243                 }
 244         }
 245         sdp_message_a_attribute_add(msg, lineno, osip_strdup("candidate"), osip_strdup(buffer));
 246 }
 247
 248 static void add_ice_candidates(sdp_message_t *msg, int lineno, const IceCheckList *ice_cl, const char *rtp_addr, int rtp_port, const char *rtcp_addr, int rtcp_port)
 249 {
 250         const IceCandidate *candidate;
 251         int i;
 252
 253         for (i = 0; i < ms_list_size(ice_cl->local_candidates); i++) {
 254                 candidate = ms_list_nth_data(ice_cl->local_candidates, i);
 255                 switch (ice_check_list_state(ice_cl)) {
 256                         case ICL_Running:
 257                                 add_candidate_attribute(msg, lineno, candidate);
 258                                 break;
 259                         case ICL_Completed:
 260                                 /* Only include the candidates matching the default destination for each component of the stream as specified in RFC5245 section 9.1.2.2. */
 261                                 if (((candidate->taddr.port == rtp_port) && (strlen(candidate->taddr.ip) == strlen(rtp_addr)) && (strcmp(candidate->taddr.ip, rtp_addr) == 0))
 262                                         || ((candidate->taddr.port == rtcp_port) && (strlen(candidate->taddr.ip) == strlen(rtcp_addr)) && (strcmp(candidate->taddr.ip, rtcp_addr) == 0))) {
 263                                         add_candidate_attribute(msg, lineno, candidate);
 264                                 }
 265                                 break;
 266                         default:
 267                                 break;
 268                 }
 269         }
 270 }
 271
 272
 273 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc, const IceCheckList *ice_cl){
 274         const char *mt=NULL;
 275         const MSList *elem;
 276         const char *rtp_addr;
 277         const char *rtcp_addr;
 278         const char *dir="sendrecv";
 279         int rtp_port;
 280         int rtcp_port;
 281         bool_t strip_well_known_rtpmaps;
 282
 283         switch (desc->type) {
 284         case SalAudio:
 285                 mt="audio";
 286                 break;
 287         case SalVideo:
 288                 mt="video";
 289                 break;
 290         case SalOther:
 291                 mt=desc->typeother;
 292                 break;
 293         }
 294         rtp_addr=rtcp_addr=desc->rtp_addr;
 295         rtp_port=desc->rtp_port;
 296         rtcp_port=desc->rtcp_port;
 297         if (ice_cl != NULL) {
 298                 if (ice_check_list_state(ice_cl) == ICL_Completed) {
 299                         ice_check_list_nominated_valid_local_candidate(ice_cl, &rtp_addr, &rtp_port, &rtcp_addr, &rtcp_port);
 300                 } else {
 301                         ice_check_list_default_local_candidate(ice_cl, &rtp_addr, &rtp_port, &rtcp_addr, &rtcp_port);
 302                 }
 303         } else if (desc->candidates[0].addr[0]!='\0'){
 304                 rtp_addr=desc->candidates[0].addr;
 305                 rtp_port=desc->candidates[0].port;
 306         }
 307
 308         if (desc->proto == SalProtoRtpSavp) {
 309                 int i;
 310
 311                 sdp_message_m_media_add (msg, osip_strdup (mt),
 312                                          int_2char (rtp_port), NULL,
 313                                          osip_strdup ("RTP/SAVP"));
 314
 315                 /* add crypto lines */
 316                 for(i=0; i<SAL_CRYPTO_ALGO_MAX; i++) {
 317                         char buffer[1024];
 318                         switch (desc->crypto[i].algo) {
 319                                 case AES_128_SHA1_80:
 320                                         snprintf(buffer, 1024, "%d %s inline:%s",
 321                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_80", desc->crypto[i].master_key);
 322                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 323                                                 osip_strdup(buffer));
 324                                         break;
 325                                 case AES_128_SHA1_32:
 326                                         snprintf(buffer, 1024, "%d %s inline:%s",
 327                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_32", desc->crypto[i].master_key);
 328                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 329                                                 osip_strdup(buffer));
 330                                         break;
 331                                 case AES_128_NO_AUTH:
 332                                         ms_warning("Unsupported crypto suite: AES_128_NO_AUTH");
 333                                         break;
 334                                 case NO_CIPHER_SHA1_80:
 335                                         ms_warning("Unsupported crypto suite: NO_CIPHER_SHA1_80");
 336                                         break;
 337                                 default:
 338                                         i = SAL_CRYPTO_ALGO_MAX;
 339                         }
 340                 }
 341
 342         } else {
 343                 sdp_message_m_media_add (msg, osip_strdup (mt),
 344                                          int_2char (rtp_port), NULL,
 345                                          osip_strdup ("RTP/AVP"));
 346
 347         }
 348
 349         /*only add a c= line within the stream description if address are differents*/
 350         if (strcmp(rtp_addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
 351                 bool_t inet6;
 352                 if (strchr(rtp_addr,':')!=NULL){
 353                         inet6=TRUE;
 354                 }else inet6=FALSE;
 355                 sdp_message_c_connection_add (msg, lineno,
 356                               osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 357                               osip_strdup (rtp_addr), NULL, NULL);
 358         }
 359
 360         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
 361                                      int_2char(desc->bandwidth));
 362         if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
 363                                 int_2char(desc->ptime));
 364         strip_well_known_rtpmaps=ms_list_size(desc->payloads)>5;
 365         if (desc->payloads){
 366                 for(elem=desc->payloads;elem!=NULL;elem=elem->next){
 367                         add_payload(msg, lineno, (PayloadType*)elem->data,strip_well_known_rtpmaps);
 368                 }
 369         }else{
 370                 /* to comply with SDP we cannot have an empty payload type number list */
 371                 /* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
 372                 sdp_message_m_payload_add (msg,lineno, int_2char (0));
 373         }
 374         switch(desc->dir){
 375                 case SalStreamSendRecv:
 376                         /*dir="sendrecv";*/
 377                         dir=NULL;
 378                 break;
 379                 case SalStreamRecvOnly:
 380                         dir="recvonly";
 381                         break;
 382                 case SalStreamSendOnly:
 383                         dir="sendonly";
 384                         break;
 385                 case SalStreamInactive:
 386                         dir="inactive";
 387                         break;
 388         }
 389         if (dir) sdp_message_a_attribute_add (msg, lineno, osip_strdup (dir),NULL);
 390         if (ice_cl != NULL) {
 391                 if (strcmp(rtp_addr, rtcp_addr) != 0) {
 392                         char buffer[1024];
 393                         snprintf(buffer, sizeof(buffer), "%u IN IP4 %s", rtcp_port, rtcp_addr);
 394                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("rtcp"), osip_strdup(buffer));
 395                 } else {
 396                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("rtcp"), int_2char(rtcp_port));
 397                 }
 398                 add_ice_candidates(msg, lineno, ice_cl, rtp_addr, rtp_port, rtcp_addr, rtcp_port);
 399         }
 400 }
 401
 402
 403 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc, const IceSession *ice_session){
 404         IceCheckList *ice_cl = NULL;
 405         int i;
 406         sdp_message_t *msg=create_generic_sdp(desc, ice_session);
 407         for(i=0;i<desc->nstreams;++i){
 408                 if (ice_session != NULL) ice_cl = ice_session_check_list(ice_session, i);
 409                 else ice_cl = NULL;
 410                 add_line(msg,i,&desc->streams[i], ice_cl);
 411         }
 412         return msg;
 413 }
 414
 415 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
 416         if (rtpmap==NULL){
 417                 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
 418                 if (refpt){
 419                         pt->mime_type=ms_strdup(refpt->mime_type);
 420                         pt->clock_rate=refpt->clock_rate;
 421                 }else{
 422                         ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
 423                             payload_type_get_number(pt));
 424                         return -1;
 425                 }
 426         }else{
 427                 char *mime=ms_strdup(rtpmap);
 428                 char *p=strchr(mime,'/');
 429                 if (p){
 430                         char *chans;
 431                         *p='\0';
 432                         p++;
 433                         chans=strchr(p,'/');
 434                         if (chans){
 435                                 *chans='\0';
 436                                 chans++;
 437                                 pt->channels=atoi(chans);
 438                         }else pt->channels=1;
 439                         pt->clock_rate=atoi(p);
 440                 }
 441                 pt->mime_type=mime;
 442         }
 443         return 0;
 444 }
 445
 446 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc, IceSession **ice_session){
 447         int i,j;
 448         const char *mtype,*proto,*rtp_port,*rtp_addr,*number;
 449         const char *ice_ufrag, *ice_pwd;
 450         sdp_bandwidth_t *sbw=NULL;
 451         sdp_attribute_t *attr;
 452         int media_attribute_nb;
 453         bool_t ice_session_just_created = FALSE;
 454         bool_t ice_lite = FALSE;
 455
 456         rtp_addr=sdp_message_c_addr_get (msg, -1, 0);
 457         if (rtp_addr)
 458                 strncpy(desc->addr,rtp_addr,sizeof(desc->addr));
 459         for(j=0;(sbw=sdp_message_bandwidth_get(msg,-1,j))!=NULL;++j){
 460                 if (strcasecmp(sbw->b_bwtype,"AS")==0) desc->bandwidth=atoi(sbw->b_bandwidth);
 461         }
 462
 463         /* for each m= line */
 464         for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
 465         {
 466                 SalStreamDescription *stream=&desc->streams[i];
 467
 468                 memset(stream,0,sizeof(*stream));
 469                 mtype = sdp_message_m_media_get(msg, i);
 470                 proto = sdp_message_m_proto_get (msg, i);
 471                 rtp_port = sdp_message_m_port_get(msg, i);
 472                 stream->proto=SalProtoUnknown;
 473                 if (proto){
 474                         if (strcasecmp(proto,"RTP/AVP")==0)
 475                                 stream->proto=SalProtoRtpAvp;
 476                         else if (strcasecmp(proto,"RTP/SAVP")==0){
 477                                 stream->proto=SalProtoRtpSavp;
 478                         }
 479                 }
 480                 rtp_addr = sdp_message_c_addr_get (msg, i, 0);
 481                 if (rtp_addr != NULL)
 482                         strncpy(stream->rtp_addr,rtp_addr,sizeof(stream->rtp_addr));
 483                 if (rtp_port)
 484                         stream->rtp_port=atoi(rtp_port);
 485
 486                 stream->ptime=_sdp_message_get_a_ptime(msg,i);
 487                 if (strcasecmp("audio", mtype) == 0){
 488                         stream->type=SalAudio;
 489                 }else if (strcasecmp("video", mtype) == 0){
 490                         stream->type=SalVideo;
 491                 }else {
 492                         stream->type=SalOther;
 493                         strncpy(stream->typeother,mtype,sizeof(stream->typeother)-1);
 494                 }
 495                 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
 496                         if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
 497                 }
 498                 stream->dir=_sdp_message_get_mline_dir(msg,i);
 499                 media_attribute_nb = 0;
 500                 /* for each payload type */
 501                 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
 502                         const char *rtpmap,*fmtp;
 503                         int ptn=atoi(number);
 504                         PayloadType *pt=payload_type_new();
 505                         payload_type_set_number(pt,ptn);
 506                         /* get the rtpmap associated to this codec, if any */
 507                         rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
 508                         if (rtpmap != NULL) media_attribute_nb++;
 509                         if (payload_type_fill_from_rtpmap(pt,rtpmap)==0){
 510                                 /* get the fmtp, if any */
 511                                 fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
 512                                 if (fmtp != NULL) media_attribute_nb++;
 513                                 payload_type_set_send_fmtp(pt,fmtp);
 514                                 stream->payloads=ms_list_append(stream->payloads,pt);
 515                                 ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
 516                                         pt->send_fmtp ? pt->send_fmtp : "");
 517                         }
 518                 }
 519
 520                 /* Get media specific RTCP attribute */
 521                 stream->rtcp_port = stream->rtp_port + 1;
 522                 snprintf(stream->rtcp_addr, sizeof(stream->rtcp_addr), stream->rtp_addr);
 523                 for (j = 0; ((attr = sdp_message_attribute_get(msg, i, j)) != NULL); j++) {
 524                         if ((keywordcmp("rtcp", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 525                                 char tmp[256];
 526                                 int nb = sscanf(attr->a_att_value, "%d IN IP4 %s", &stream->rtcp_port, tmp);
 527                                 if (nb == 1) {
 528                                         /* SDP rtcp attribute only contains the port */
 529                                 } else if (nb == 2) {
 530                                         strncpy(stream->rtcp_addr, tmp, sizeof(stream->rtcp_addr));
 531                                 } else {
 532                                         ms_warning("sdp has a strange a= line (%s) nb=%i", attr->a_att_value, nb);
 533                                 }
 534                         }
 535                 }
 536
 537                 /* read crypto lines if any */
 538                 if (stream->proto == SalProtoRtpSavp) {
 539                         int k, valid_count = 0;
 540
 541                         memset(&stream->crypto, 0, sizeof(stream->crypto));
 542                         for (k=0;valid_count < SAL_CRYPTO_ALGO_MAX && (attr=sdp_message_attribute_get(msg,i,k))!=NULL;k++){
 543                                 char tmp[256], tmp2[256];
 544                                 if (keywordcmp("crypto",attr->a_att_field)==0 && attr->a_att_value!=NULL){
 545                                         int nb = sscanf(attr->a_att_value, "%d %256s inline:%256s",
 546                                                 &stream->crypto[valid_count].tag,
 547                                                 tmp,
 548                                                 tmp2);
 549                                                 ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 550                                                                 stream->crypto[valid_count].tag,
 551                                                                 tmp,
 552                                                                 tmp2);
 553                                         if (nb == 3) {
 554                                                 if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_80") == 0)
 555                                                         stream->crypto[valid_count].algo = AES_128_SHA1_80;
 556                                                 else if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_32") == 0)
 557                                                         stream->crypto[valid_count].algo = AES_128_SHA1_32;
 558                                                 else {
 559                                                         ms_warning("Failed to parse crypto-algo: '%s'", tmp);
 560                                                         stream->crypto[valid_count].algo = 0;
 561                                                 }
 562                                                 if (stream->crypto[valid_count].algo) {
 563                                                         strncpy(stream->crypto[valid_count].master_key, tmp2, 41);
 564                                                         stream->crypto[valid_count].master_key[40] = '\0';
 565                                                         ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 566                                                                 stream->crypto[valid_count].tag,
 567                                                                 tmp,
 568                                                                 stream->crypto[valid_count].master_key);
 569                                                         valid_count++;
 570                                                 }
 571                                         } else {
 572                                                 ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
 573                                         }
 574                                 }
 575                         }
 576                         ms_message("Found: %d valid crypto lines", valid_count);
 577                 }
 578
 579                 /* Get ICE candidate attributes if any */
 580                 ice_ufrag = ice_pwd = NULL;
 581                 for (j = 0; (j < SAL_MEDIA_DESCRIPTION_MAX_ICE_CANDIDATES) && ((attr = sdp_message_attribute_get(msg, i, media_attribute_nb + j)) != NULL); j++) {
 582                         if ((keywordcmp("candidate", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 583                                 char ip[64];
 584                                 char foundation[32];
 585                                 char type[6];
 586                                 unsigned int priority;
 587                                 unsigned int componentID;
 588                                 unsigned int port;
 589                                 int nb;
 590
 591                                 /* Allocate the ICE session if it has not been done yet. */
 592                                 if (*ice_session == NULL) {
 593                                         *ice_session = ice_session_new();
 594                                         ice_session_just_created = TRUE;
 595                                 }
 596                                 /* Allocate the ICE check list if it has not been done yet. */
 597                                 if (ice_session_check_list(*ice_session, i) == NULL) {
 598                                         ice_session_add_check_list(*ice_session, ice_check_list_new());
 599                                 }
 600                                 nb = sscanf(attr->a_att_value, "%s %u UDP %u %s %u typ %s",
 601                                         foundation, &componentID, &priority, ip, &port, type);
 602                                 if (nb == 6) {
 603                                         ice_add_remote_candidate(ice_session_check_list(*ice_session, i), type, ip, port, componentID, priority, foundation);
 604                                 }
 605                         } else if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 606                                 ice_ufrag = attr->a_att_value;
 607                         } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 608                                 ice_pwd = attr->a_att_value;
 609                         }
 610                 }
 611                 if ((*ice_session != NULL) && ice_session_check_list(*ice_session, i)) {
 612                         if ((ice_ufrag != NULL) && (ice_pwd != NULL)) {
 613                                 ice_check_list_set_remote_credentials(ice_session_check_list(*ice_session, i), ice_ufrag, ice_pwd);
 614                         }
 615                         ice_dump_candidates(ice_session_check_list(*ice_session, i));
 616                 }
 617         }
 618         desc->nstreams=i;
 619
 620         /* Get ICE remote ufrag and remote pwd */
 621         ice_ufrag = ice_pwd = NULL;
 622         for (i = 0; (i < SAL_MEDIA_DESCRIPTION_MAX_MESSAGE_ATTRIBUTES) && ((attr = sdp_message_attribute_get(msg, -1, i)) != NULL); i++) {
 623                 if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 624                         ice_ufrag = attr->a_att_value;
 625                 } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 626                         ice_pwd = attr->a_att_value;
 627                 } else if (keywordcmp("ice-lite", attr->a_att_field) == 0) {
 628                         ice_lite = TRUE;
 629                 }
 630         }
 631         if (*ice_session != NULL) {
 632                 if (ice_session_just_created == TRUE) {
 633                         if (ice_lite == TRUE) {
 634                                 ice_session_set_role(*ice_session, IR_Controlling);
 635                         } else {
 636                                 ice_session_set_role(*ice_session, IR_Controlled);
 637                         }
 638                 }
 639                 if ((ice_ufrag != NULL) && (ice_pwd != NULL)) {
 640                         ice_session_set_remote_credentials(*ice_session, ice_ufrag, ice_pwd);
 641                         ice_dump_session(*ice_session);
 642                 }
 643         }
 644         return 0;
 645 }