Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (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 | #include <pjmedia/vid_stream.h> |
| 20 | #include <pjmedia/sdp_neg.h> |
| 21 | #include <pjmedia/stream_common.h> |
| 22 | #include <pj/ctype.h> |
| 23 | #include <pj/rand.h> |
| 24 | |
| 25 | #if defined(PJMEDIA_HAS_VIDEO) && (PJMEDIA_HAS_VIDEO != 0) |
| 26 | |
| 27 | static const pj_str_t ID_VIDEO = { "video", 5}; |
| 28 | static const pj_str_t ID_IN = { "IN", 2 }; |
| 29 | static const pj_str_t ID_IP4 = { "IP4", 3}; |
| 30 | static const pj_str_t ID_IP6 = { "IP6", 3}; |
| 31 | static const pj_str_t ID_RTP_AVP = { "RTP/AVP", 7 }; |
| 32 | static const pj_str_t ID_RTP_SAVP = { "RTP/SAVP", 8 }; |
| 33 | //static const pj_str_t ID_SDP_NAME = { "pjmedia", 7 }; |
| 34 | static const pj_str_t ID_RTPMAP = { "rtpmap", 6 }; |
| 35 | |
| 36 | static const pj_str_t STR_INACTIVE = { "inactive", 8 }; |
| 37 | static const pj_str_t STR_SENDRECV = { "sendrecv", 8 }; |
| 38 | static const pj_str_t STR_SENDONLY = { "sendonly", 8 }; |
| 39 | static const pj_str_t STR_RECVONLY = { "recvonly", 8 }; |
| 40 | |
| 41 | |
| 42 | /* |
| 43 | * Internal function for collecting codec info and param from the SDP media. |
| 44 | */ |
| 45 | static pj_status_t get_video_codec_info_param(pjmedia_vid_stream_info *si, |
| 46 | pj_pool_t *pool, |
| 47 | pjmedia_vid_codec_mgr *mgr, |
| 48 | const pjmedia_sdp_media *local_m, |
| 49 | const pjmedia_sdp_media *rem_m) |
| 50 | { |
| 51 | unsigned pt = 0; |
| 52 | const pjmedia_vid_codec_info *p_info; |
| 53 | pj_status_t status; |
| 54 | |
| 55 | pt = pj_strtoul(&local_m->desc.fmt[0]); |
| 56 | |
| 57 | /* Get payload type for receiving direction */ |
| 58 | si->rx_pt = pt; |
| 59 | |
| 60 | /* Get codec info and payload type for transmitting direction. */ |
| 61 | if (pt < 96) { |
| 62 | /* For static payload types, get the codec info from codec manager. */ |
| 63 | status = pjmedia_vid_codec_mgr_get_codec_info(mgr, pt, &p_info); |
| 64 | if (status != PJ_SUCCESS) |
| 65 | return status; |
| 66 | |
| 67 | si->codec_info = *p_info; |
| 68 | |
| 69 | /* Get payload type for transmitting direction. |
| 70 | * For static payload type, pt's are symetric. |
| 71 | */ |
| 72 | si->tx_pt = pt; |
| 73 | } else { |
| 74 | const pjmedia_sdp_attr *attr; |
| 75 | pjmedia_sdp_rtpmap *rtpmap; |
| 76 | pjmedia_codec_id codec_id; |
| 77 | pj_str_t codec_id_st; |
| 78 | unsigned i; |
| 79 | |
| 80 | /* Determine payload type for outgoing channel, by finding |
| 81 | * dynamic payload type in remote SDP that matches the answer. |
| 82 | */ |
| 83 | si->tx_pt = 0xFFFF; |
| 84 | for (i=0; i<rem_m->desc.fmt_count; ++i) { |
| 85 | if (pjmedia_sdp_neg_fmt_match(NULL, |
| 86 | (pjmedia_sdp_media*)local_m, 0, |
| 87 | (pjmedia_sdp_media*)rem_m, i, 0) == |
| 88 | PJ_SUCCESS) |
| 89 | { |
| 90 | /* Found matched codec. */ |
| 91 | si->tx_pt = pj_strtoul(&rem_m->desc.fmt[i]); |
| 92 | break; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | if (si->tx_pt == 0xFFFF) |
| 97 | return PJMEDIA_EMISSINGRTPMAP; |
| 98 | |
| 99 | /* For dynamic payload types, get codec name from the rtpmap */ |
| 100 | attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP, |
| 101 | &local_m->desc.fmt[0]); |
| 102 | if (attr == NULL) |
| 103 | return PJMEDIA_EMISSINGRTPMAP; |
| 104 | |
| 105 | status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap); |
| 106 | if (status != PJ_SUCCESS) |
| 107 | return status; |
| 108 | |
| 109 | /* Then get the codec info from the codec manager */ |
| 110 | pj_ansi_snprintf(codec_id, sizeof(codec_id), "%.*s/", |
| 111 | (int)rtpmap->enc_name.slen, rtpmap->enc_name.ptr); |
| 112 | codec_id_st = pj_str(codec_id); |
| 113 | i = 1; |
| 114 | status = pjmedia_vid_codec_mgr_find_codecs_by_id(mgr, &codec_id_st, |
| 115 | &i, &p_info, NULL); |
| 116 | if (status != PJ_SUCCESS) |
| 117 | return status; |
| 118 | |
| 119 | si->codec_info = *p_info; |
| 120 | } |
| 121 | |
| 122 | |
| 123 | /* Request for codec with the correct packing for streaming */ |
| 124 | si->codec_info.packings = PJMEDIA_VID_PACKING_PACKETS; |
| 125 | |
| 126 | /* Now that we have codec info, get the codec param. */ |
| 127 | si->codec_param = PJ_POOL_ALLOC_T(pool, pjmedia_vid_codec_param); |
| 128 | status = pjmedia_vid_codec_mgr_get_default_param(mgr, |
| 129 | &si->codec_info, |
| 130 | si->codec_param); |
| 131 | |
| 132 | /* Adjust encoding bitrate, if higher than remote preference. The remote |
| 133 | * bitrate preference is read from SDP "b=TIAS" line in media level. |
| 134 | */ |
| 135 | if ((si->dir & PJMEDIA_DIR_ENCODING) && rem_m->bandw_count) { |
| 136 | unsigned i, bandw = 0; |
| 137 | |
| 138 | for (i = 0; i < rem_m->bandw_count; ++i) { |
| 139 | const pj_str_t STR_BANDW_MODIFIER_TIAS = { "TIAS", 4 }; |
| 140 | if (!pj_stricmp(&rem_m->bandw[i]->modifier, |
| 141 | &STR_BANDW_MODIFIER_TIAS)) |
| 142 | { |
| 143 | bandw = rem_m->bandw[i]->value; |
| 144 | break; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | if (bandw) { |
| 149 | pjmedia_video_format_detail *enc_vfd; |
| 150 | enc_vfd = pjmedia_format_get_video_format_detail( |
| 151 | &si->codec_param->enc_fmt, PJ_TRUE); |
| 152 | if (!enc_vfd->avg_bps || enc_vfd->avg_bps > bandw) |
| 153 | enc_vfd->avg_bps = bandw * 3 / 4; |
| 154 | if (!enc_vfd->max_bps || enc_vfd->max_bps > bandw) |
| 155 | enc_vfd->max_bps = bandw; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | /* Get remote fmtp for our encoder. */ |
| 160 | pjmedia_stream_info_parse_fmtp(pool, rem_m, si->tx_pt, |
| 161 | &si->codec_param->enc_fmtp); |
| 162 | |
| 163 | /* Get local fmtp for our decoder. */ |
| 164 | pjmedia_stream_info_parse_fmtp(pool, local_m, si->rx_pt, |
| 165 | &si->codec_param->dec_fmtp); |
| 166 | |
| 167 | /* When direction is NONE (it means SDP negotiation has failed) we don't |
| 168 | * need to return a failure here, as returning failure will cause |
| 169 | * the whole SDP to be rejected. See ticket #: |
| 170 | * http:// |
| 171 | * |
| 172 | * Thanks Alain Totouom |
| 173 | */ |
| 174 | if (status != PJ_SUCCESS && si->dir != PJMEDIA_DIR_NONE) |
| 175 | return status; |
| 176 | |
| 177 | return PJ_SUCCESS; |
| 178 | } |
| 179 | |
| 180 | |
| 181 | |
| 182 | /* |
| 183 | * Create stream info from SDP media line. |
| 184 | */ |
| 185 | PJ_DEF(pj_status_t) pjmedia_vid_stream_info_from_sdp( |
| 186 | pjmedia_vid_stream_info *si, |
| 187 | pj_pool_t *pool, |
| 188 | pjmedia_endpt *endpt, |
| 189 | const pjmedia_sdp_session *local, |
| 190 | const pjmedia_sdp_session *remote, |
| 191 | unsigned stream_idx) |
| 192 | { |
| 193 | const pjmedia_sdp_attr *attr; |
| 194 | const pjmedia_sdp_media *local_m; |
| 195 | const pjmedia_sdp_media *rem_m; |
| 196 | const pjmedia_sdp_conn *local_conn; |
| 197 | const pjmedia_sdp_conn *rem_conn; |
| 198 | int rem_af, local_af; |
| 199 | pj_sockaddr local_addr; |
| 200 | pj_status_t status; |
| 201 | |
| 202 | PJ_UNUSED_ARG(endpt); |
| 203 | |
| 204 | /* Validate arguments: */ |
| 205 | PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL); |
| 206 | PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL); |
| 207 | PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL); |
| 208 | |
| 209 | /* Keep SDP shortcuts */ |
| 210 | local_m = local->media[stream_idx]; |
| 211 | rem_m = remote->media[stream_idx]; |
| 212 | |
| 213 | local_conn = local_m->conn ? local_m->conn : local->conn; |
| 214 | if (local_conn == NULL) |
| 215 | return PJMEDIA_SDP_EMISSINGCONN; |
| 216 | |
| 217 | rem_conn = rem_m->conn ? rem_m->conn : remote->conn; |
| 218 | if (rem_conn == NULL) |
| 219 | return PJMEDIA_SDP_EMISSINGCONN; |
| 220 | |
| 221 | /* Media type must be video */ |
| 222 | if (pj_stricmp(&local_m->desc.media, &ID_VIDEO) != 0) |
| 223 | return PJMEDIA_EINVALIMEDIATYPE; |
| 224 | |
| 225 | |
| 226 | /* Reset: */ |
| 227 | |
| 228 | pj_bzero(si, sizeof(*si)); |
| 229 | |
| 230 | /* Media type: */ |
| 231 | si->type = PJMEDIA_TYPE_VIDEO; |
| 232 | |
| 233 | /* Transport protocol */ |
| 234 | |
| 235 | /* At this point, transport type must be compatible, |
| 236 | * the transport instance will do more validation later. |
| 237 | */ |
| 238 | status = pjmedia_sdp_transport_cmp(&rem_m->desc.transport, |
| 239 | &local_m->desc.transport); |
| 240 | if (status != PJ_SUCCESS) |
| 241 | return PJMEDIA_SDPNEG_EINVANSTP; |
| 242 | |
| 243 | if (pj_stricmp(&local_m->desc.transport, &ID_RTP_AVP) == 0) { |
| 244 | |
| 245 | si->proto = PJMEDIA_TP_PROTO_RTP_AVP; |
| 246 | |
| 247 | } else if (pj_stricmp(&local_m->desc.transport, &ID_RTP_SAVP) == 0) { |
| 248 | |
| 249 | si->proto = PJMEDIA_TP_PROTO_RTP_SAVP; |
| 250 | |
| 251 | } else { |
| 252 | |
| 253 | si->proto = PJMEDIA_TP_PROTO_UNKNOWN; |
| 254 | return PJ_SUCCESS; |
| 255 | } |
| 256 | |
| 257 | |
| 258 | /* Check address family in remote SDP */ |
| 259 | rem_af = pj_AF_UNSPEC(); |
| 260 | if (pj_stricmp(&rem_conn->net_type, &ID_IN)==0) { |
| 261 | if (pj_stricmp(&rem_conn->addr_type, &ID_IP4)==0) { |
| 262 | rem_af = pj_AF_INET(); |
| 263 | } else if (pj_stricmp(&rem_conn->addr_type, &ID_IP6)==0) { |
| 264 | rem_af = pj_AF_INET6(); |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | if (rem_af==pj_AF_UNSPEC()) { |
| 269 | /* Unsupported address family */ |
| 270 | return PJ_EAFNOTSUP; |
| 271 | } |
| 272 | |
| 273 | /* Set remote address: */ |
| 274 | status = pj_sockaddr_init(rem_af, &si->rem_addr, &rem_conn->addr, |
| 275 | rem_m->desc.port); |
| 276 | if (status != PJ_SUCCESS) { |
| 277 | /* Invalid IP address. */ |
| 278 | return PJMEDIA_EINVALIDIP; |
| 279 | } |
| 280 | |
| 281 | /* Check address family of local info */ |
| 282 | local_af = pj_AF_UNSPEC(); |
| 283 | if (pj_stricmp(&local_conn->net_type, &ID_IN)==0) { |
| 284 | if (pj_stricmp(&local_conn->addr_type, &ID_IP4)==0) { |
| 285 | local_af = pj_AF_INET(); |
| 286 | } else if (pj_stricmp(&local_conn->addr_type, &ID_IP6)==0) { |
| 287 | local_af = pj_AF_INET6(); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | if (local_af==pj_AF_UNSPEC()) { |
| 292 | /* Unsupported address family */ |
| 293 | return PJ_SUCCESS; |
| 294 | } |
| 295 | |
| 296 | /* Set remote address: */ |
| 297 | status = pj_sockaddr_init(local_af, &local_addr, &local_conn->addr, |
| 298 | local_m->desc.port); |
| 299 | if (status != PJ_SUCCESS) { |
| 300 | /* Invalid IP address. */ |
| 301 | return PJMEDIA_EINVALIDIP; |
| 302 | } |
| 303 | |
| 304 | /* Local and remote address family must match */ |
| 305 | if (local_af != rem_af) |
| 306 | return PJ_EAFNOTSUP; |
| 307 | |
| 308 | /* Media direction: */ |
| 309 | |
| 310 | if (local_m->desc.port == 0 || |
| 311 | pj_sockaddr_has_addr(&local_addr)==PJ_FALSE || |
| 312 | pj_sockaddr_has_addr(&si->rem_addr)==PJ_FALSE || |
| 313 | pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL) |
| 314 | { |
| 315 | /* Inactive stream. */ |
| 316 | |
| 317 | si->dir = PJMEDIA_DIR_NONE; |
| 318 | |
| 319 | } else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) { |
| 320 | |
| 321 | /* Send only stream. */ |
| 322 | |
| 323 | si->dir = PJMEDIA_DIR_ENCODING; |
| 324 | |
| 325 | } else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) { |
| 326 | |
| 327 | /* Recv only stream. */ |
| 328 | |
| 329 | si->dir = PJMEDIA_DIR_DECODING; |
| 330 | |
| 331 | } else { |
| 332 | |
| 333 | /* Send and receive stream. */ |
| 334 | |
| 335 | si->dir = PJMEDIA_DIR_ENCODING_DECODING; |
| 336 | |
| 337 | } |
| 338 | |
| 339 | /* No need to do anything else if stream is rejected */ |
| 340 | if (local_m->desc.port == 0) { |
| 341 | return PJ_SUCCESS; |
| 342 | } |
| 343 | |
| 344 | /* If "rtcp" attribute is present in the SDP, set the RTCP address |
| 345 | * from that attribute. Otherwise, calculate from RTP address. |
| 346 | */ |
| 347 | attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr, |
| 348 | "rtcp", NULL); |
| 349 | if (attr) { |
| 350 | pjmedia_sdp_rtcp_attr rtcp; |
| 351 | status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp); |
| 352 | if (status == PJ_SUCCESS) { |
| 353 | if (rtcp.addr.slen) { |
| 354 | status = pj_sockaddr_init(rem_af, &si->rem_rtcp, &rtcp.addr, |
| 355 | (pj_uint16_t)rtcp.port); |
| 356 | } else { |
| 357 | pj_sockaddr_init(rem_af, &si->rem_rtcp, NULL, |
| 358 | (pj_uint16_t)rtcp.port); |
| 359 | pj_memcpy(pj_sockaddr_get_addr(&si->rem_rtcp), |
| 360 | pj_sockaddr_get_addr(&si->rem_addr), |
| 361 | pj_sockaddr_get_addr_len(&si->rem_addr)); |
| 362 | } |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | if (!pj_sockaddr_has_addr(&si->rem_rtcp)) { |
| 367 | int rtcp_port; |
| 368 | |
| 369 | pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr)); |
| 370 | rtcp_port = pj_sockaddr_get_port(&si->rem_addr) + 1; |
| 371 | pj_sockaddr_set_port(&si->rem_rtcp, (pj_uint16_t)rtcp_port); |
| 372 | } |
| 373 | |
| 374 | /* Get codec info and param */ |
| 375 | status = get_video_codec_info_param(si, pool, NULL, local_m, rem_m); |
| 376 | |
| 377 | /* Leave SSRC to random. */ |
| 378 | si->ssrc = pj_rand(); |
| 379 | |
| 380 | /* Set default jitter buffer parameter. */ |
| 381 | si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1; |
| 382 | |
| 383 | return status; |
| 384 | } |
| 385 | |
| 386 | #endif /* PJMEDIA_HAS_VIDEO */ |