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/port.h"
  22 #include "ortp/b64.h"
  23 #include "ortp/ortp_srtp.h"
  24 #include "sal.h"
  25 #include <eXosip2/eXosip.h>
  26
  27 #define keywordcmp(key,b) strncmp(key,b,sizeof(key))
  28
  29 #ifdef FOR_LATER
  30
  31 static char *make_relay_session_id(const char *username, const char *relay){
  32         /*ideally this should be a hash of the parameters with a random part*/
  33         char tmp[128];
  34         int s1=(int)random();
  35         int s2=(int)random();
  36         long long int res=((long long int)s1)<<32 | (long long int) s2;
  37         void *src=&res;
  38         b64_encode(src, sizeof(long long int), tmp, sizeof(tmp));
  39         return osip_strdup(tmp);
  40 }
  41
  42
  43 static void add_relay_info(sdp_message_t *sdp, int mline, const char *relay, const char *relay_session_id){
  44
  45         if (relay) sdp_message_a_attribute_add(sdp, mline,
  46                                      osip_strdup ("relay-addr"),osip_strdup(relay));
  47         if (relay_session_id) sdp_message_a_attribute_add(sdp, mline,
  48                                      osip_strdup ("relay-session-id"), osip_strdup(relay_session_id));
  49 }
  50
  51 #endif
  52
  53 static char * int_2char(int a){
  54         char *p=osip_malloc(16);
  55         snprintf(p,16,"%i",a);
  56         return p;
  57 }
  58
  59 /* return the value of attr "field" for payload pt at line pos (field=rtpmap,fmtp...)*/
  60 static const char *sdp_message_a_attr_value_get_with_pt(sdp_message_t *sdp,int pos,int pt,const char *field)
  61 {
  62         int i,tmppt=0,scanned=0;
  63         char *tmp;
  64         sdp_attribute_t *attr;
  65         for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
  66                 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
  67                         int nb = sscanf(attr->a_att_value,"%i %n",&tmppt,&scanned);
  68                         /* the return value may depend on how %n is interpreted by the libc: see manpage*/
  69                         if (nb == 1 || nb==2 ){
  70                                 if (pt==tmppt){
  71                                         tmp=attr->a_att_value+scanned;
  72                                         if (strlen(tmp)>0)
  73                                                 return tmp;
  74                                 }
  75                         }else ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
  76                 }
  77         }
  78         return NULL;
  79 }
  80
  81 #ifdef FOR_LATER
  82 /* return the value of attr "field" */
  83 static const char *sdp_message_a_attr_value_get(sdp_message_t *sdp,int pos,const char *field)
  84 {
  85         int i;
  86         sdp_attribute_t *attr;
  87         for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
  88                 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
  89                         return attr->a_att_value;
  90                 }
  91         }
  92         return NULL;
  93 }
  94 #endif
  95
  96 static int _sdp_message_get_a_ptime(sdp_message_t *sdp, int mline){
  97         int i,ret;
  98         sdp_attribute_t *attr;
  99         for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
 100                 if (keywordcmp("ptime",attr->a_att_field)==0){
 101                         int nb = sscanf(attr->a_att_value,"%i",&ret);
 102                         /* the return value may depend on how %n is interpreted by the libc: see manpage*/
 103                         if (nb == 1){
 104                                 return ret;
 105                         }else ms_warning("sdp has a strange a=ptime line (%s) ",attr->a_att_value);
 106                 }
 107         }
 108         return 0;
 109 }
 110
 111 static int _sdp_message_get_mline_dir(sdp_message_t *sdp, int mline){
 112         int i;
 113         sdp_attribute_t *attr;
 114         for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
 115                 if (keywordcmp("sendrecv",attr->a_att_field)==0){
 116                         return SalStreamSendRecv;
 117                 }else if (keywordcmp("sendonly",attr->a_att_field)==0){
 118                         return SalStreamSendOnly;
 119                 }else if (keywordcmp("recvonly",attr->a_att_field)==0){
 120                         return SalStreamRecvOnly;
 121                 }else if (keywordcmp("inactive",attr->a_att_field)==0){
 122                         return SalStreamInactive;
 123                 }
 124         }
 125         return SalStreamSendRecv;
 126 }
 127
 128 static sdp_message_t *create_generic_sdp(const SalMediaDescription *desc)
 129 {
 130         sdp_message_t *local;
 131         int inet6;
 132         char sessid[16];
 133         char sessver[16];
 134         const char *rtp_addr = desc->addr;
 135
 136         snprintf(sessid,16,"%i",desc->session_id);
 137         snprintf(sessver,16,"%i",desc->session_ver);
 138         sdp_message_init (&local);
 139         if (strchr(desc->addr,':')!=NULL){
 140                 inet6=1;
 141         }else inet6=0;
 142         sdp_message_v_version_set (local, osip_strdup ("0"));
 143         sdp_message_o_origin_set (local, osip_strdup (desc->username),
 144                           osip_strdup (sessid), osip_strdup (sessver),
 145                           osip_strdup ("IN"), inet6 ? osip_strdup("IP6") : osip_strdup ("IP4"),
 146                           osip_strdup (desc->addr));
 147         sdp_message_s_name_set (local, osip_strdup ("Talk"));
 148         /* Do not set the c= line to 0.0.0.0 if there is an ICE session. */
 149         if((desc->ice_ufrag[0] != '\0') || !sal_media_description_has_dir (desc,SalStreamSendOnly))
 150         {
 151                 sdp_message_c_connection_add (local, -1,
 152                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 153                                                 osip_strdup (rtp_addr), NULL, NULL);
 154         }
 155         else
 156         {
 157                 sdp_message_c_connection_add (local, -1,
 158                                 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 159                                                 inet6 ? osip_strdup ("::0") : osip_strdup ("0.0.0.0"), NULL, NULL);
 160         }
 161         sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
 162         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (local, -1, osip_strdup ("AS"),
 163                         int_2char(desc->bandwidth));
 164         if (desc->ice_completed == TRUE) sdp_message_a_attribute_add(local, -1, osip_strdup("nortpproxy"), osip_strdup("yes"));
 165         if (desc->ice_pwd[0] != '\0') sdp_message_a_attribute_add(local, -1, osip_strdup("ice-pwd"), osip_strdup(desc->ice_pwd));
 166         if (desc->ice_ufrag[0] != '\0') sdp_message_a_attribute_add(local, -1, osip_strdup("ice-ufrag"), osip_strdup(desc->ice_ufrag));
 167
 168         return local;
 169 }
 170
 171
 172 static bool_t is_known_rtpmap(const PayloadType *pt){
 173         switch(payload_type_get_number(pt)){
 174                 case 0:
 175                 case 8:
 176                 case 3:
 177                 case 34:
 178                         return TRUE;
 179         }
 180         return FALSE;
 181 }
 182
 183 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt, bool_t strip_well_known_rtpmaps)
 184 {
 185         char attr[256];
 186         sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
 187
 188         if (!strip_well_known_rtpmaps || !is_known_rtpmap(pt)){
 189                 if (pt->channels>1)
 190                         snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
 191                                         pt->mime_type, pt->clock_rate,pt->channels);
 192                 else
 193                         snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
 194                                         pt->mime_type, pt->clock_rate);
 195                 sdp_message_a_attribute_add (msg, line,
 196                                                  osip_strdup ("rtpmap"), osip_strdup(attr));
 197         }
 198
 199         if (pt->recv_fmtp != NULL)
 200         {
 201                 snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
 202                 sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
 203                                      osip_strdup(attr));
 204         }
 205 }
 206
 207 static void add_ice_candidates(sdp_message_t *msg, int lineno, const SalStreamDescription *desc)
 208 {
 209         char buffer[1024];
 210         const SalIceCandidate *candidate;
 211         int nb;
 212         int i;
 213
 214         for (i = 0; i < SAL_MEDIA_DESCRIPTION_MAX_ICE_CANDIDATES; i++) {
 215                 candidate = &desc->ice_candidates[i];
 216                 if ((candidate->addr[0] == '\0') || (candidate->port == 0)) break;
 217                 nb = snprintf(buffer, sizeof(buffer), "%s %u UDP %u %s %d typ %s",
 218                         candidate->foundation, candidate->componentID, candidate->priority, candidate->addr, candidate->port, candidate->type);
 219                 if (nb < 0) {
 220                         ms_error("Cannot add ICE candidate attribute!");
 221                         return;
 222                 }
 223                 if (candidate->raddr[0] != '\0') {
 224                         nb = snprintf(buffer + nb, sizeof(buffer) - nb, " raddr %s rport %d", candidate->raddr, candidate->rport);
 225                         if (nb < 0) {
 226                                 ms_error("Cannot add ICE candidate attribute!");
 227                                 return;
 228                         }
 229                 }
 230                 sdp_message_a_attribute_add(msg, lineno, osip_strdup("candidate"), osip_strdup(buffer));
 231         }
 232 }
 233
 234 static void add_ice_remote_candidates(sdp_message_t *msg, int lineno, const SalStreamDescription *desc)
 235 {
 236         char buffer[1024];
 237         char *ptr = buffer;
 238         const SalIceRemoteCandidate *candidate;
 239         int offset = 0;
 240         int i;
 241
 242         buffer[0] = '\0';
 243         for (i = 0; i < SAL_MEDIA_DESCRIPTION_MAX_ICE_REMOTE_CANDIDATES; i++) {
 244                 candidate = &desc->ice_remote_candidates[i];
 245                 if ((candidate->addr[0] != '\0') && (candidate->port != 0)) {
 246                         offset = snprintf(ptr, buffer + sizeof(buffer) - ptr, "%s%d %s %d", (i > 0) ? " " : "", i + 1, candidate->addr, candidate->port);
 247                         if (offset < 0) {
 248                                 ms_error("Cannot add ICE remote-candidates attribute!");
 249                                 return;
 250                         }
 251                         ptr += offset;
 252                 }
 253         }
 254         if (buffer[0] != '\0') sdp_message_a_attribute_add(msg, lineno, osip_strdup("remote-candidates"), osip_strdup(buffer));
 255 }
 256
 257 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc){
 258         const char *mt=NULL;
 259         const MSList *elem;
 260         const char *rtp_addr;
 261         const char *rtcp_addr;
 262         const char *dir="sendrecv";
 263         int rtp_port;
 264         int rtcp_port;
 265         bool_t strip_well_known_rtpmaps;
 266         bool_t different_rtp_and_rtcp_addr;
 267
 268         switch (desc->type) {
 269         case SalAudio:
 270                 mt="audio";
 271                 break;
 272         case SalVideo:
 273                 mt="video";
 274                 break;
 275         case SalOther:
 276                 mt=desc->typeother;
 277                 break;
 278         }
 279         rtp_addr=desc->rtp_addr;
 280         rtcp_addr=desc->rtcp_addr;
 281         rtp_port=desc->rtp_port;
 282         rtcp_port=desc->rtcp_port;
 283
 284         if (desc->proto == SalProtoRtpSavp) {
 285                 int i;
 286
 287                 sdp_message_m_media_add (msg, osip_strdup (mt),
 288                                          int_2char (rtp_port), NULL,
 289                                          osip_strdup ("RTP/SAVP"));
 290
 291                 /* add crypto lines */
 292                 for(i=0; i<SAL_CRYPTO_ALGO_MAX; i++) {
 293                         char buffer[1024];
 294                         switch (desc->crypto[i].algo) {
 295                                 case AES_128_SHA1_80:
 296                                         snprintf(buffer, 1024, "%d %s inline:%s",
 297                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_80", desc->crypto[i].master_key);
 298                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 299                                                 osip_strdup(buffer));
 300                                         break;
 301                                 case AES_128_SHA1_32:
 302                                         snprintf(buffer, 1024, "%d %s inline:%s",
 303                                                 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_32", desc->crypto[i].master_key);
 304                                         sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
 305                                                 osip_strdup(buffer));
 306                                         break;
 307                                 case AES_128_NO_AUTH:
 308                                         ms_warning("Unsupported crypto suite: AES_128_NO_AUTH");
 309                                         break;
 310                                 case NO_CIPHER_SHA1_80:
 311                                         ms_warning("Unsupported crypto suite: NO_CIPHER_SHA1_80");
 312                                         break;
 313                                 default:
 314                                         i = SAL_CRYPTO_ALGO_MAX;
 315                         }
 316                 }
 317
 318         } else {
 319                 sdp_message_m_media_add (msg, osip_strdup (mt),
 320                                          int_2char (rtp_port), NULL,
 321                                          osip_strdup ("RTP/AVP"));
 322
 323         }
 324
 325         /*only add a c= line within the stream description if address are differents*/
 326         if (rtp_addr[0]!='\0' && strcmp(rtp_addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
 327                 bool_t inet6;
 328                 if (strchr(rtp_addr,':')!=NULL){
 329                         inet6=TRUE;
 330                 }else inet6=FALSE;
 331                 sdp_message_c_connection_add (msg, lineno,
 332                               osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
 333                               osip_strdup (rtp_addr), NULL, NULL);
 334         }
 335
 336         if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
 337                                      int_2char(desc->bandwidth));
 338         if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
 339                                 int_2char(desc->ptime));
 340         strip_well_known_rtpmaps=ms_list_size(desc->payloads)>5;
 341         if (desc->payloads){
 342                 for(elem=desc->payloads;elem!=NULL;elem=elem->next){
 343                         add_payload(msg, lineno, (PayloadType*)elem->data,strip_well_known_rtpmaps);
 344                 }
 345         }else{
 346                 /* to comply with SDP we cannot have an empty payload type number list */
 347                 /* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
 348                 sdp_message_m_payload_add (msg,lineno, int_2char (0));
 349         }
 350         switch(desc->dir){
 351                 case SalStreamSendRecv:
 352                         /*dir="sendrecv";*/
 353                         dir=NULL;
 354                 break;
 355                 case SalStreamRecvOnly:
 356                         dir="recvonly";
 357                         break;
 358                 case SalStreamSendOnly:
 359                         dir="sendonly";
 360                         break;
 361                 case SalStreamInactive:
 362                         dir="inactive";
 363                         break;
 364         }
 365         if (dir) sdp_message_a_attribute_add (msg, lineno, osip_strdup (dir),NULL);
 366         if (rtp_port != 0) {
 367                 different_rtp_and_rtcp_addr = (rtcp_addr[0] != '\0') && (strcmp(rtp_addr, rtcp_addr) != 0);
 368                 if ((rtcp_port != (rtp_port + 1)) || (different_rtp_and_rtcp_addr == TRUE)) {
 369                         if (different_rtp_and_rtcp_addr == TRUE) {
 370                                 char buffer[1024];
 371                                 snprintf(buffer, sizeof(buffer), "%u IN IP4 %s", rtcp_port, rtcp_addr);
 372                                 sdp_message_a_attribute_add(msg, lineno, osip_strdup("rtcp"), osip_strdup(buffer));
 373                         } else {
 374                                 sdp_message_a_attribute_add(msg, lineno, osip_strdup("rtcp"), int_2char(rtcp_port));
 375                         }
 376                 }
 377         }
 378         if (desc->ice_completed == TRUE) {
 379                 sdp_message_a_attribute_add(msg, lineno, osip_strdup("nortpproxy"), osip_strdup("yes"));
 380         }
 381         if (desc->ice_mismatch == TRUE) {
 382                 sdp_message_a_attribute_add(msg, lineno, osip_strdup("ice-mismatch"), NULL);
 383         } else {
 384                 if (desc->rtp_port != 0) {
 385                         if (desc->ice_pwd[0] != '\0') sdp_message_a_attribute_add(msg, lineno, osip_strdup("ice-pwd"), osip_strdup(desc->ice_pwd));
 386                         if (desc->ice_ufrag[0] != '\0') sdp_message_a_attribute_add(msg, lineno, osip_strdup("ice-ufrag"), osip_strdup(desc->ice_ufrag));
 387                         add_ice_candidates(msg, lineno, desc);
 388                         add_ice_remote_candidates(msg, lineno, desc);
 389                 }
 390         }
 391 }
 392
 393
 394 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc){
 395         int i;
 396         sdp_message_t *msg=create_generic_sdp(desc);
 397         for(i=0;i<desc->nstreams;++i){
 398                 add_line(msg,i,&desc->streams[i]);
 399         }
 400         return msg;
 401 }
 402
 403 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
 404         if (rtpmap==NULL){
 405                 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
 406                 if (refpt){
 407                         pt->mime_type=ms_strdup(refpt->mime_type);
 408                         pt->clock_rate=refpt->clock_rate;
 409                 }else{
 410                         ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
 411                             payload_type_get_number(pt));
 412                         return -1;
 413                 }
 414         }else{
 415                 char *mime=ms_strdup(rtpmap);
 416                 char *p=strchr(mime,'/');
 417                 if (p){
 418                         char *chans;
 419                         *p='\0';
 420                         p++;
 421                         chans=strchr(p,'/');
 422                         if (chans){
 423                                 *chans='\0';
 424                                 chans++;
 425                                 pt->channels=atoi(chans);
 426                         }else pt->channels=1;
 427                         pt->clock_rate=atoi(p);
 428                 }
 429                 pt->mime_type=mime;
 430         }
 431         return 0;
 432 }
 433
 434 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc){
 435         int i,j;
 436         const char *mtype,*proto,*rtp_port,*rtp_addr,*number;
 437         sdp_bandwidth_t *sbw=NULL;
 438         sdp_attribute_t *attr;
 439         int nb_ice_candidates;
 440
 441         rtp_addr=sdp_message_c_addr_get (msg, -1, 0);
 442         if (rtp_addr)
 443                 strncpy(desc->addr,rtp_addr,sizeof(desc->addr));
 444         for(j=0;(sbw=sdp_message_bandwidth_get(msg,-1,j))!=NULL;++j){
 445                 if (strcasecmp(sbw->b_bwtype,"AS")==0) desc->bandwidth=atoi(sbw->b_bandwidth);
 446         }
 447
 448         /* Get ICE remote ufrag and remote pwd, and ice_lite flag */
 449         for (i = 0; (i < SAL_MEDIA_DESCRIPTION_MAX_MESSAGE_ATTRIBUTES) && ((attr = sdp_message_attribute_get(msg, -1, i)) != NULL); i++) {
 450                 if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 451                         strncpy(desc->ice_ufrag, attr->a_att_value, sizeof(desc->ice_ufrag));
 452                 } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 453                         strncpy(desc->ice_pwd, attr->a_att_value, sizeof(desc->ice_pwd));
 454                 } else if (keywordcmp("ice-lite", attr->a_att_field) == 0) {
 455                         desc->ice_lite = TRUE;
 456                 }
 457         }
 458
 459         /* for each m= line */
 460         for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
 461         {
 462                 SalStreamDescription *stream=&desc->streams[i];
 463                 nb_ice_candidates = 0;
 464
 465                 memset(stream,0,sizeof(*stream));
 466                 mtype = sdp_message_m_media_get(msg, i);
 467                 proto = sdp_message_m_proto_get (msg, i);
 468                 rtp_port = sdp_message_m_port_get(msg, i);
 469                 stream->proto=SalProtoUnknown;
 470                 if (proto){
 471                         if (strcasecmp(proto,"RTP/AVP")==0)
 472                                 stream->proto=SalProtoRtpAvp;
 473                         else if (strcasecmp(proto,"RTP/SAVP")==0){
 474                                 stream->proto=SalProtoRtpSavp;
 475                         }
 476                 }
 477                 rtp_addr = sdp_message_c_addr_get (msg, i, 0);
 478                 if (rtp_addr != NULL)
 479                         strncpy(stream->rtp_addr,rtp_addr,sizeof(stream->rtp_addr));
 480                 if (rtp_port)
 481                         stream->rtp_port=atoi(rtp_port);
 482
 483                 stream->ptime=_sdp_message_get_a_ptime(msg,i);
 484                 if (strcasecmp("audio", mtype) == 0){
 485                         stream->type=SalAudio;
 486                 }else if (strcasecmp("video", mtype) == 0){
 487                         stream->type=SalVideo;
 488                 }else {
 489                         stream->type=SalOther;
 490                         strncpy(stream->typeother,mtype,sizeof(stream->typeother)-1);
 491                 }
 492                 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
 493                         if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
 494                 }
 495                 stream->dir=_sdp_message_get_mline_dir(msg,i);
 496                 /* for each payload type */
 497                 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
 498                         const char *rtpmap,*fmtp;
 499                         int ptn=atoi(number);
 500                         PayloadType *pt=payload_type_new();
 501                         payload_type_set_number(pt,ptn);
 502                         /* get the rtpmap associated to this codec, if any */
 503                         rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
 504                         if (payload_type_fill_from_rtpmap(pt,rtpmap)==0){
 505                                 /* get the fmtp, if any */
 506                                 fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
 507                                 payload_type_set_send_fmtp(pt,fmtp);
 508                                 stream->payloads=ms_list_append(stream->payloads,pt);
 509                                 ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
 510                                         pt->send_fmtp ? pt->send_fmtp : "");
 511                         }
 512                 }
 513
 514                 /* Get media specific RTCP attribute */
 515                 stream->rtcp_port = stream->rtp_port + 1;
 516                 snprintf(stream->rtcp_addr, sizeof(stream->rtcp_addr), "%s", stream->rtp_addr);
 517                 for (j = 0; ((attr = sdp_message_attribute_get(msg, i, j)) != NULL); j++) {
 518                         if ((keywordcmp("rtcp", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 519                                 char tmp[256];
 520                                 int nb = sscanf(attr->a_att_value, "%d IN IP4 %s", &stream->rtcp_port, tmp);
 521                                 if (nb == 1) {
 522                                         /* SDP rtcp attribute only contains the port */
 523                                 } else if (nb == 2) {
 524                                         strncpy(stream->rtcp_addr, tmp, sizeof(stream->rtcp_addr));
 525                                 } else {
 526                                         ms_warning("sdp has a strange a= line (%s) nb=%i", attr->a_att_value, nb);
 527                                 }
 528                         }
 529                 }
 530
 531                 /* read crypto lines if any */
 532                 if (stream->proto == SalProtoRtpSavp) {
 533                         int k, valid_count = 0;
 534
 535                         memset(&stream->crypto, 0, sizeof(stream->crypto));
 536                         for (k=0;valid_count < SAL_CRYPTO_ALGO_MAX && (attr=sdp_message_attribute_get(msg,i,k))!=NULL;k++){
 537                                 char tmp[256], tmp2[256];
 538                                 if (keywordcmp("crypto",attr->a_att_field)==0 && attr->a_att_value!=NULL){
 539                                         int nb = sscanf(attr->a_att_value, "%d %256s inline:%256s",
 540                                                 &stream->crypto[valid_count].tag,
 541                                                 tmp,
 542                                                 tmp2);
 543                                                 ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 544                                                                 stream->crypto[valid_count].tag,
 545                                                                 tmp,
 546                                                                 tmp2);
 547                                         if (nb == 3) {
 548                                                 if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_80") == 0)
 549                                                         stream->crypto[valid_count].algo = AES_128_SHA1_80;
 550                                                 else if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_32") == 0)
 551                                                         stream->crypto[valid_count].algo = AES_128_SHA1_32;
 552                                                 else {
 553                                                         ms_warning("Failed to parse crypto-algo: '%s'", tmp);
 554                                                         stream->crypto[valid_count].algo = 0;
 555                                                 }
 556                                                 if (stream->crypto[valid_count].algo) {
 557                                                         strncpy(stream->crypto[valid_count].master_key, tmp2, 41);
 558                                                         stream->crypto[valid_count].master_key[40] = '\0';
 559                                                         ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
 560                                                                 stream->crypto[valid_count].tag,
 561                                                                 tmp,
 562                                                                 stream->crypto[valid_count].master_key);
 563                                                         valid_count++;
 564                                                 }
 565                                         } else {
 566                                                 ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
 567                                         }
 568                                 }
 569                         }
 570                         ms_message("Found: %d valid crypto lines", valid_count);
 571                 }
 572
 573                 /* Get ICE candidate attributes if any */
 574                 for (j = 0; (attr = sdp_message_attribute_get(msg, i, j)) != NULL; j++) {
 575                         if ((keywordcmp("candidate", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 576                                 SalIceCandidate *candidate = &stream->ice_candidates[nb_ice_candidates];
 577                                 int nb = sscanf(attr->a_att_value, "%s %u UDP %u %s %d typ %s raddr %s rport %d",
 578                                         candidate->foundation, &candidate->componentID, &candidate->priority, candidate->addr, &candidate->port,
 579                                         candidate->type, candidate->raddr, &candidate->rport);
 580                                 if ((nb == 6) || (nb == 8)) nb_ice_candidates++;
 581                                 else memset(candidate, 0, sizeof(*candidate));
 582                         } else if ((keywordcmp("remote-candidates", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 583                                 SalIceRemoteCandidate candidate;
 584                                 unsigned int componentID;
 585                                 int offset;
 586                                 char *ptr = attr->a_att_value;
 587                                 while (3 == sscanf(ptr, "%u %s %u%n", &componentID, candidate.addr, &candidate.port, &offset)) {
 588                                         if ((componentID > 0) && (componentID <= SAL_MEDIA_DESCRIPTION_MAX_ICE_REMOTE_CANDIDATES)) {
 589                                                 SalIceRemoteCandidate *remote_candidate = &stream->ice_remote_candidates[componentID - 1];
 590                                                 strncpy(remote_candidate->addr, candidate.addr, sizeof(remote_candidate->addr));
 591                                                 remote_candidate->port = candidate.port;
 592                                         }
 593                                         ptr += offset;
 594                                         if (ptr[offset] == ' ') ptr += 1;
 595                                 }
 596                         } else if ((keywordcmp("ice-ufrag", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 597                                 strncpy(stream->ice_ufrag, attr->a_att_value, sizeof(stream->ice_ufrag));
 598                         } else if ((keywordcmp("ice-pwd", attr->a_att_field) == 0) && (attr->a_att_value != NULL)) {
 599                                 strncpy(stream->ice_pwd, attr->a_att_value, sizeof(stream->ice_pwd));
 600                         } else if (keywordcmp("ice-mismatch", attr->a_att_field) == 0) {
 601                                 stream->ice_mismatch = TRUE;
 602                         }
 603                 }
 604         }
 605         desc->nstreams=i;
 606         return 0;
 607 }