Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pjmedia/stream.h> |
| 21 | #include <pjmedia/stream_common.h> |
| 22 | #include <pj/ctype.h> |
| 23 | #include <pj/rand.h> |
| 24 | |
| 25 | static const pj_str_t ID_AUDIO = { "audio", 5}; |
| 26 | static const pj_str_t ID_IN = { "IN", 2 }; |
| 27 | static const pj_str_t ID_IP4 = { "IP4", 3}; |
| 28 | static const pj_str_t ID_IP6 = { "IP6", 3}; |
| 29 | static const pj_str_t ID_RTP_AVP = { "RTP/AVP", 7 }; |
| 30 | static const pj_str_t ID_RTP_SAVP = { "RTP/SAVP", 8 }; |
| 31 | //static const pj_str_t ID_SDP_NAME = { "pjmedia", 7 }; |
| 32 | static const pj_str_t ID_RTPMAP = { "rtpmap", 6 }; |
| 33 | static const pj_str_t ID_TELEPHONE_EVENT = { "telephone-event", 15 }; |
| 34 | |
| 35 | static const pj_str_t STR_INACTIVE = { "inactive", 8 }; |
| 36 | static const pj_str_t STR_SENDRECV = { "sendrecv", 8 }; |
| 37 | static const pj_str_t STR_SENDONLY = { "sendonly", 8 }; |
| 38 | static const pj_str_t STR_RECVONLY = { "recvonly", 8 }; |
| 39 | |
| 40 | |
| 41 | /* |
| 42 | * Internal function for collecting codec info and param from the SDP media. |
| 43 | */ |
| 44 | static pj_status_t get_audio_codec_info_param(pjmedia_stream_info *si, |
| 45 | pj_pool_t *pool, |
| 46 | pjmedia_codec_mgr *mgr, |
| 47 | const pjmedia_sdp_media *local_m, |
| 48 | const pjmedia_sdp_media *rem_m) |
| 49 | { |
| 50 | const pjmedia_sdp_attr *attr; |
| 51 | pjmedia_sdp_rtpmap *rtpmap; |
| 52 | unsigned i, fmti, pt = 0; |
| 53 | pj_status_t status; |
| 54 | |
| 55 | /* Find the first codec which is not telephone-event */ |
| 56 | for ( fmti = 0; fmti < local_m->desc.fmt_count; ++fmti ) { |
| 57 | pjmedia_sdp_rtpmap r; |
| 58 | |
| 59 | if ( !pj_isdigit(*local_m->desc.fmt[fmti].ptr) ) |
| 60 | return PJMEDIA_EINVALIDPT; |
| 61 | pt = pj_strtoul(&local_m->desc.fmt[fmti]); |
| 62 | |
| 63 | if (pt < 96) { |
| 64 | /* This is known static PT. Skip rtpmap checking because it is |
| 65 | * optional. */ |
| 66 | break; |
| 67 | } |
| 68 | |
| 69 | attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| 70 | &local_m->desc.fmt[fmti]); |
| 71 | if (attr == NULL) |
| 72 | continue; |
| 73 | |
| 74 | status = pjmedia_sdp_attr_get_rtpmap(attr, &r); |
| 75 | if (status != PJ_SUCCESS) |
| 76 | continue; |
| 77 | |
| 78 | if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) != 0) |
| 79 | break; |
| 80 | } |
| 81 | if ( fmti >= local_m->desc.fmt_count ) |
| 82 | return PJMEDIA_EINVALIDPT; |
| 83 | |
| 84 | /* Get payload type for receiving direction */ |
| 85 | si->rx_pt = pt; |
| 86 | |
| 87 | /* Get codec info. |
| 88 | * For static payload types, get the info from codec manager. |
| 89 | * For dynamic payload types, MUST get the rtpmap. |
| 90 | */ |
| 91 | if (pt < 96) { |
| 92 | pj_bool_t has_rtpmap; |
| 93 | |
| 94 | rtpmap = NULL; |
| 95 | has_rtpmap = PJ_TRUE; |
| 96 | |
| 97 | attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| 98 | &local_m->desc.fmt[fmti]); |
| 99 | if (attr == NULL) { |
| 100 | has_rtpmap = PJ_FALSE; |
| 101 | } |
| 102 | if (attr != NULL) { |
| 103 | status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap); |
| 104 | if (status != PJ_SUCCESS) |
| 105 | has_rtpmap = PJ_FALSE; |
| 106 | } |
| 107 | |
| 108 | /* Build codec format info: */ |
| 109 | if (has_rtpmap) { |
| 110 | si->fmt.type = si->type; |
| 111 | si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]); |
| 112 | pj_strdup(pool, &si->fmt.encoding_name, &rtpmap->enc_name); |
| 113 | si->fmt.clock_rate = rtpmap->clock_rate; |
| 114 | |
| 115 | #if defined(PJMEDIA_HANDLE_G722_MPEG_BUG) && (PJMEDIA_HANDLE_G722_MPEG_BUG != 0) |
| 116 | /* The session info should have the actual clock rate, because |
| 117 | * this info is used for calculationg buffer size, etc in stream |
| 118 | */ |
| 119 | if (si->fmt.pt == PJMEDIA_RTP_PT_G722) |
| 120 | si->fmt.clock_rate = 16000; |
| 121 | #endif |
| 122 | |
| 123 | /* For audio codecs, rtpmap parameters denotes the number of |
| 124 | * channels. |
| 125 | */ |
| 126 | if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) { |
| 127 | si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param); |
| 128 | } else { |
| 129 | si->fmt.channel_cnt = 1; |
| 130 | } |
| 131 | |
| 132 | } else { |
| 133 | const pjmedia_codec_info *p_info; |
| 134 | |
| 135 | status = pjmedia_codec_mgr_get_codec_info( mgr, pt, &p_info); |
| 136 | if (status != PJ_SUCCESS) |
| 137 | return status; |
| 138 | |
| 139 | pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info)); |
| 140 | } |
| 141 | |
| 142 | /* For static payload type, pt's are symetric */ |
| 143 | si->tx_pt = pt; |
| 144 | |
| 145 | } else { |
| 146 | pjmedia_codec_id codec_id; |
| 147 | pj_str_t codec_id_st; |
| 148 | const pjmedia_codec_info *p_info; |
| 149 | |
| 150 | attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| 151 | &local_m->desc.fmt[fmti]); |
| 152 | if (attr == NULL) |
| 153 | return PJMEDIA_EMISSINGRTPMAP; |
| 154 | |
| 155 | status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap); |
| 156 | if (status != PJ_SUCCESS) |
| 157 | return status; |
| 158 | |
| 159 | /* Build codec format info: */ |
| 160 | |
| 161 | si->fmt.type = si->type; |
| 162 | si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]); |
| 163 | si->fmt.encoding_name = rtpmap->enc_name; |
| 164 | si->fmt.clock_rate = rtpmap->clock_rate; |
| 165 | |
| 166 | /* For audio codecs, rtpmap parameters denotes the number of |
| 167 | * channels. |
| 168 | */ |
| 169 | if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) { |
| 170 | si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param); |
| 171 | } else { |
| 172 | si->fmt.channel_cnt = 1; |
| 173 | } |
| 174 | |
| 175 | /* Normalize the codec info from codec manager. Note that the |
| 176 | * payload type will be resetted to its default (it might have |
| 177 | * been rewritten by the SDP negotiator to match to the remote |
| 178 | * offer), this is intentional as currently some components may |
| 179 | * prefer (or even require) the default PT in codec info. |
| 180 | */ |
| 181 | pjmedia_codec_info_to_id(&si->fmt, codec_id, sizeof(codec_id)); |
| 182 | |
| 183 | i = 1; |
| 184 | codec_id_st = pj_str(codec_id); |
| 185 | status = pjmedia_codec_mgr_find_codecs_by_id(mgr, &codec_id_st, |
| 186 | &i, &p_info, NULL); |
| 187 | if (status != PJ_SUCCESS) |
| 188 | return status; |
| 189 | |
| 190 | pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info)); |
| 191 | |
| 192 | /* Determine payload type for outgoing channel, by finding |
| 193 | * dynamic payload type in remote SDP that matches the answer. |
| 194 | */ |
| 195 | si->tx_pt = 0xFFFF; |
| 196 | for (i=0; i<rem_m->desc.fmt_count; ++i) { |
| 197 | unsigned rpt; |
| 198 | pjmedia_sdp_attr *r_attr; |
| 199 | pjmedia_sdp_rtpmap r_rtpmap; |
| 200 | |
| 201 | rpt = pj_strtoul(&rem_m->desc.fmt[i]); |
| 202 | if (rpt < 96) |
| 203 | continue; |
| 204 | |
| 205 | r_attr = pjmedia_sdp_media_find_attr(rem_m, &ID_RTPMAP, |
| 206 | &rem_m->desc.fmt[i]); |
| 207 | if (!r_attr) |
| 208 | continue; |
| 209 | |
| 210 | if (pjmedia_sdp_attr_get_rtpmap(r_attr, &r_rtpmap) != PJ_SUCCESS) |
| 211 | continue; |
| 212 | |
| 213 | if (!pj_stricmp(&rtpmap->enc_name, &r_rtpmap.enc_name) && |
| 214 | rtpmap->clock_rate == r_rtpmap.clock_rate) |
| 215 | { |
| 216 | /* Found matched codec. */ |
| 217 | si->tx_pt = rpt; |
| 218 | |
| 219 | break; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | if (si->tx_pt == 0xFFFF) |
| 224 | return PJMEDIA_EMISSINGRTPMAP; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | /* Now that we have codec info, get the codec param. */ |
| 229 | si->param = PJ_POOL_ALLOC_T(pool, pjmedia_codec_param); |
| 230 | status = pjmedia_codec_mgr_get_default_param(mgr, &si->fmt, |
| 231 | si->param); |
| 232 | |
| 233 | /* Get remote fmtp for our encoder. */ |
| 234 | pjmedia_stream_info_parse_fmtp(pool, rem_m, si->tx_pt, |
| 235 | &si->param->setting.enc_fmtp); |
| 236 | |
| 237 | /* Get local fmtp for our decoder. */ |
| 238 | pjmedia_stream_info_parse_fmtp(pool, local_m, si->rx_pt, |
| 239 | &si->param->setting.dec_fmtp); |
| 240 | |
| 241 | /* Get the remote ptime for our encoder. */ |
| 242 | attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr, |
| 243 | "ptime", NULL); |
| 244 | if (attr) { |
| 245 | pj_str_t tmp_val = attr->value; |
| 246 | unsigned frm_per_pkt; |
| 247 | |
| 248 | pj_strltrim(&tmp_val); |
| 249 | |
| 250 | /* Round up ptime when the specified is not multiple of frm_ptime */ |
| 251 | frm_per_pkt = (pj_strtoul(&tmp_val) + |
| 252 | si->param->info.frm_ptime/2) / |
| 253 | si->param->info.frm_ptime; |
| 254 | if (frm_per_pkt != 0) { |
| 255 | si->param->setting.frm_per_pkt = (pj_uint8_t)frm_per_pkt; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /* Get remote maxptime for our encoder. */ |
| 260 | attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr, |
| 261 | "maxptime", NULL); |
| 262 | if (attr) { |
| 263 | pj_str_t tmp_val = attr->value; |
| 264 | |
| 265 | pj_strltrim(&tmp_val); |
| 266 | si->tx_maxptime = pj_strtoul(&tmp_val); |
| 267 | } |
| 268 | |
| 269 | /* When direction is NONE (it means SDP negotiation has failed) we don't |
| 270 | * need to return a failure here, as returning failure will cause |
| 271 | * the whole SDP to be rejected. See ticket #: |
| 272 | * http:// |
| 273 | * |
| 274 | * Thanks Alain Totouom |
| 275 | */ |
| 276 | if (status != PJ_SUCCESS && si->dir != PJMEDIA_DIR_NONE) |
| 277 | return status; |
| 278 | |
| 279 | |
| 280 | /* Get incomming payload type for telephone-events */ |
| 281 | si->rx_event_pt = -1; |
| 282 | for (i=0; i<local_m->attr_count; ++i) { |
| 283 | pjmedia_sdp_rtpmap r; |
| 284 | |
| 285 | attr = local_m->attr[i]; |
| 286 | if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0) |
| 287 | continue; |
| 288 | if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS) |
| 289 | continue; |
| 290 | if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) { |
| 291 | si->rx_event_pt = pj_strtoul(&r.pt); |
| 292 | break; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | /* Get outgoing payload type for telephone-events */ |
| 297 | si->tx_event_pt = -1; |
| 298 | for (i=0; i<rem_m->attr_count; ++i) { |
| 299 | pjmedia_sdp_rtpmap r; |
| 300 | |
| 301 | attr = rem_m->attr[i]; |
| 302 | if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0) |
| 303 | continue; |
| 304 | if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS) |
| 305 | continue; |
| 306 | if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) { |
| 307 | si->tx_event_pt = pj_strtoul(&r.pt); |
| 308 | break; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | return PJ_SUCCESS; |
| 313 | } |
| 314 | |
| 315 | |
| 316 | |
| 317 | /* |
| 318 | * Create stream info from SDP media line. |
| 319 | */ |
| 320 | PJ_DEF(pj_status_t) pjmedia_stream_info_from_sdp( |
| 321 | pjmedia_stream_info *si, |
| 322 | pj_pool_t *pool, |
| 323 | pjmedia_endpt *endpt, |
| 324 | const pjmedia_sdp_session *local, |
| 325 | const pjmedia_sdp_session *remote, |
| 326 | unsigned stream_idx) |
| 327 | { |
| 328 | pjmedia_codec_mgr *mgr; |
| 329 | const pjmedia_sdp_attr *attr; |
| 330 | const pjmedia_sdp_media *local_m; |
| 331 | const pjmedia_sdp_media *rem_m; |
| 332 | const pjmedia_sdp_conn *local_conn; |
| 333 | const pjmedia_sdp_conn *rem_conn; |
| 334 | int rem_af, local_af; |
| 335 | pj_sockaddr local_addr; |
| 336 | pj_status_t status; |
| 337 | |
| 338 | |
| 339 | /* Validate arguments: */ |
| 340 | PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL); |
| 341 | PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL); |
| 342 | PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL); |
| 343 | |
| 344 | /* Keep SDP shortcuts */ |
| 345 | local_m = local->media[stream_idx]; |
| 346 | rem_m = remote->media[stream_idx]; |
| 347 | |
| 348 | local_conn = local_m->conn ? local_m->conn : local->conn; |
| 349 | if (local_conn == NULL) |
| 350 | return PJMEDIA_SDP_EMISSINGCONN; |
| 351 | |
| 352 | rem_conn = rem_m->conn ? rem_m->conn : remote->conn; |
| 353 | if (rem_conn == NULL) |
| 354 | return PJMEDIA_SDP_EMISSINGCONN; |
| 355 | |
| 356 | /* Media type must be audio */ |
| 357 | if (pj_stricmp(&local_m->desc.media, &ID_AUDIO) != 0) |
| 358 | return PJMEDIA_EINVALIMEDIATYPE; |
| 359 | |
| 360 | /* Get codec manager. */ |
| 361 | mgr = pjmedia_endpt_get_codec_mgr(endpt); |
| 362 | |
| 363 | /* Reset: */ |
| 364 | |
| 365 | pj_bzero(si, sizeof(*si)); |
| 366 | |
| 367 | #if PJMEDIA_HAS_RTCP_XR && PJMEDIA_STREAM_ENABLE_XR |
| 368 | /* Set default RTCP XR enabled/disabled */ |
| 369 | si->rtcp_xr_enabled = PJ_TRUE; |
| 370 | #endif |
| 371 | |
| 372 | /* Media type: */ |
| 373 | si->type = PJMEDIA_TYPE_AUDIO; |
| 374 | |
| 375 | /* Transport protocol */ |
| 376 | |
| 377 | /* At this point, transport type must be compatible, |
| 378 | * the transport instance will do more validation later. |
| 379 | */ |
| 380 | status = pjmedia_sdp_transport_cmp(&rem_m->desc.transport, |
| 381 | &local_m->desc.transport); |
| 382 | if (status != PJ_SUCCESS) |
| 383 | return PJMEDIA_SDPNEG_EINVANSTP; |
| 384 | |
| 385 | if (pj_stricmp(&local_m->desc.transport, &ID_RTP_AVP) == 0) { |
| 386 | |
| 387 | si->proto = PJMEDIA_TP_PROTO_RTP_AVP; |
| 388 | |
| 389 | } else if (pj_stricmp(&local_m->desc.transport, &ID_RTP_SAVP) == 0) { |
| 390 | |
| 391 | si->proto = PJMEDIA_TP_PROTO_RTP_SAVP; |
| 392 | |
| 393 | } else { |
| 394 | |
| 395 | si->proto = PJMEDIA_TP_PROTO_UNKNOWN; |
| 396 | return PJ_SUCCESS; |
| 397 | } |
| 398 | |
| 399 | |
| 400 | /* Check address family in remote SDP */ |
| 401 | rem_af = pj_AF_UNSPEC(); |
| 402 | if (pj_stricmp(&rem_conn->net_type, &ID_IN)==0) { |
| 403 | if (pj_stricmp(&rem_conn->addr_type, &ID_IP4)==0) { |
| 404 | rem_af = pj_AF_INET(); |
| 405 | } else if (pj_stricmp(&rem_conn->addr_type, &ID_IP6)==0) { |
| 406 | rem_af = pj_AF_INET6(); |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | if (rem_af==pj_AF_UNSPEC()) { |
| 411 | /* Unsupported address family */ |
| 412 | return PJ_EAFNOTSUP; |
| 413 | } |
| 414 | |
| 415 | /* Set remote address: */ |
| 416 | status = pj_sockaddr_init(rem_af, &si->rem_addr, &rem_conn->addr, |
| 417 | rem_m->desc.port); |
| 418 | if (status != PJ_SUCCESS) { |
| 419 | /* Invalid IP address. */ |
| 420 | return PJMEDIA_EINVALIDIP; |
| 421 | } |
| 422 | |
| 423 | /* Check address family of local info */ |
| 424 | local_af = pj_AF_UNSPEC(); |
| 425 | if (pj_stricmp(&local_conn->net_type, &ID_IN)==0) { |
| 426 | if (pj_stricmp(&local_conn->addr_type, &ID_IP4)==0) { |
| 427 | local_af = pj_AF_INET(); |
| 428 | } else if (pj_stricmp(&local_conn->addr_type, &ID_IP6)==0) { |
| 429 | local_af = pj_AF_INET6(); |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | if (local_af==pj_AF_UNSPEC()) { |
| 434 | /* Unsupported address family */ |
| 435 | return PJ_SUCCESS; |
| 436 | } |
| 437 | |
| 438 | /* Set remote address: */ |
| 439 | status = pj_sockaddr_init(local_af, &local_addr, &local_conn->addr, |
| 440 | local_m->desc.port); |
| 441 | if (status != PJ_SUCCESS) { |
| 442 | /* Invalid IP address. */ |
| 443 | return PJMEDIA_EINVALIDIP; |
| 444 | } |
| 445 | |
| 446 | /* Local and remote address family must match */ |
| 447 | if (local_af != rem_af) |
| 448 | return PJ_EAFNOTSUP; |
| 449 | |
| 450 | /* Media direction: */ |
| 451 | |
| 452 | if (local_m->desc.port == 0 || |
| 453 | pj_sockaddr_has_addr(&local_addr)==PJ_FALSE || |
| 454 | pj_sockaddr_has_addr(&si->rem_addr)==PJ_FALSE || |
| 455 | pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL) |
| 456 | { |
| 457 | /* Inactive stream. */ |
| 458 | |
| 459 | si->dir = PJMEDIA_DIR_NONE; |
| 460 | |
| 461 | } else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) { |
| 462 | |
| 463 | /* Send only stream. */ |
| 464 | |
| 465 | si->dir = PJMEDIA_DIR_ENCODING; |
| 466 | |
| 467 | } else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) { |
| 468 | |
| 469 | /* Recv only stream. */ |
| 470 | |
| 471 | si->dir = PJMEDIA_DIR_DECODING; |
| 472 | |
| 473 | } else { |
| 474 | |
| 475 | /* Send and receive stream. */ |
| 476 | |
| 477 | si->dir = PJMEDIA_DIR_ENCODING_DECODING; |
| 478 | |
| 479 | } |
| 480 | |
| 481 | /* No need to do anything else if stream is rejected */ |
| 482 | if (local_m->desc.port == 0) { |
| 483 | return PJ_SUCCESS; |
| 484 | } |
| 485 | |
| 486 | /* If "rtcp" attribute is present in the SDP, set the RTCP address |
| 487 | * from that attribute. Otherwise, calculate from RTP address. |
| 488 | */ |
| 489 | attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr, |
| 490 | "rtcp", NULL); |
| 491 | if (attr) { |
| 492 | pjmedia_sdp_rtcp_attr rtcp; |
| 493 | status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp); |
| 494 | if (status == PJ_SUCCESS) { |
| 495 | if (rtcp.addr.slen) { |
| 496 | status = pj_sockaddr_init(rem_af, &si->rem_rtcp, &rtcp.addr, |
| 497 | (pj_uint16_t)rtcp.port); |
| 498 | } else { |
| 499 | pj_sockaddr_init(rem_af, &si->rem_rtcp, NULL, |
| 500 | (pj_uint16_t)rtcp.port); |
| 501 | pj_memcpy(pj_sockaddr_get_addr(&si->rem_rtcp), |
| 502 | pj_sockaddr_get_addr(&si->rem_addr), |
| 503 | pj_sockaddr_get_addr_len(&si->rem_addr)); |
| 504 | } |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | if (!pj_sockaddr_has_addr(&si->rem_rtcp)) { |
| 509 | int rtcp_port; |
| 510 | |
| 511 | pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr)); |
| 512 | rtcp_port = pj_sockaddr_get_port(&si->rem_addr) + 1; |
| 513 | pj_sockaddr_set_port(&si->rem_rtcp, (pj_uint16_t)rtcp_port); |
| 514 | } |
| 515 | |
| 516 | |
| 517 | /* Get the payload number for receive channel. */ |
| 518 | /* |
| 519 | Previously we used to rely on fmt[0] being the selected codec, |
| 520 | but some UA sends telephone-event as fmt[0] and this would |
| 521 | cause assert failure below. |
| 522 | |
| 523 | Thanks Chris Hamilton <chamilton .at. cs.dal.ca> for this patch. |
| 524 | |
| 525 | // And codec must be numeric! |
| 526 | if (!pj_isdigit(*local_m->desc.fmt[0].ptr) || |
| 527 | !pj_isdigit(*rem_m->desc.fmt[0].ptr)) |
| 528 | { |
| 529 | return PJMEDIA_EINVALIDPT; |
| 530 | } |
| 531 | |
| 532 | pt = pj_strtoul(&local_m->desc.fmt[0]); |
| 533 | pj_assert(PJMEDIA_RTP_PT_TELEPHONE_EVENTS==0 || |
| 534 | pt != PJMEDIA_RTP_PT_TELEPHONE_EVENTS); |
| 535 | */ |
| 536 | |
| 537 | /* Get codec info and param */ |
| 538 | status = get_audio_codec_info_param(si, pool, mgr, local_m, rem_m); |
| 539 | |
| 540 | /* Leave SSRC to random. */ |
| 541 | si->ssrc = pj_rand(); |
| 542 | |
| 543 | /* Set default jitter buffer parameter. */ |
| 544 | si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1; |
| 545 | |
| 546 | return status; |
| 547 | } |
| 548 | |