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/transport_loop.h> |
| 21 | #include <pj/array.h> |
| 22 | #include <pj/assert.h> |
| 23 | #include <pj/errno.h> |
| 24 | #include <pj/ioqueue.h> |
| 25 | #include <pj/log.h> |
| 26 | #include <pj/pool.h> |
| 27 | #include <pj/rand.h> |
| 28 | #include <pj/string.h> |
| 29 | |
| 30 | |
| 31 | struct user |
| 32 | { |
| 33 | pj_bool_t rx_disabled; /**< Doesn't want to receive pkt? */ |
| 34 | void *user_data; /**< Only valid when attached */ |
| 35 | void (*rtp_cb)( void*, /**< To report incoming RTP. */ |
| 36 | void*, |
| 37 | pj_ssize_t); |
| 38 | void (*rtcp_cb)( void*, /**< To report incoming RTCP. */ |
| 39 | void*, |
| 40 | pj_ssize_t); |
| 41 | }; |
| 42 | |
| 43 | struct transport_loop |
| 44 | { |
| 45 | pjmedia_transport base; /**< Base transport. */ |
| 46 | |
| 47 | pj_pool_t *pool; /**< Memory pool */ |
| 48 | unsigned user_cnt; /**< Number of attachments */ |
| 49 | struct user users[4]; /**< Array of users. */ |
| 50 | |
| 51 | unsigned tx_drop_pct; /**< Percent of tx pkts to drop. */ |
| 52 | unsigned rx_drop_pct; /**< Percent of rx pkts to drop. */ |
| 53 | |
| 54 | }; |
| 55 | |
| 56 | |
| 57 | |
| 58 | /* |
| 59 | * These are media transport operations. |
| 60 | */ |
| 61 | static pj_status_t transport_get_info (pjmedia_transport *tp, |
| 62 | pjmedia_transport_info *info); |
| 63 | static pj_status_t transport_attach (pjmedia_transport *tp, |
| 64 | void *user_data, |
| 65 | const pj_sockaddr_t *rem_addr, |
| 66 | const pj_sockaddr_t *rem_rtcp, |
| 67 | unsigned addr_len, |
| 68 | void (*rtp_cb)(void*, |
| 69 | void*, |
| 70 | pj_ssize_t), |
| 71 | void (*rtcp_cb)(void*, |
| 72 | void*, |
| 73 | pj_ssize_t)); |
| 74 | static void transport_detach (pjmedia_transport *tp, |
| 75 | void *strm); |
| 76 | static pj_status_t transport_send_rtp( pjmedia_transport *tp, |
| 77 | const void *pkt, |
| 78 | pj_size_t size); |
| 79 | static pj_status_t transport_send_rtcp(pjmedia_transport *tp, |
| 80 | const void *pkt, |
| 81 | pj_size_t size); |
| 82 | static pj_status_t transport_send_rtcp2(pjmedia_transport *tp, |
| 83 | const pj_sockaddr_t *addr, |
| 84 | unsigned addr_len, |
| 85 | const void *pkt, |
| 86 | pj_size_t size); |
| 87 | static pj_status_t transport_media_create(pjmedia_transport *tp, |
| 88 | pj_pool_t *pool, |
| 89 | unsigned options, |
| 90 | const pjmedia_sdp_session *sdp_remote, |
| 91 | unsigned media_index); |
| 92 | static pj_status_t transport_encode_sdp(pjmedia_transport *tp, |
| 93 | pj_pool_t *pool, |
| 94 | pjmedia_sdp_session *sdp_local, |
| 95 | const pjmedia_sdp_session *rem_sdp, |
| 96 | unsigned media_index); |
| 97 | static pj_status_t transport_media_start (pjmedia_transport *tp, |
| 98 | pj_pool_t *pool, |
| 99 | const pjmedia_sdp_session *sdp_local, |
| 100 | const pjmedia_sdp_session *sdp_remote, |
| 101 | unsigned media_index); |
| 102 | static pj_status_t transport_media_stop(pjmedia_transport *tp); |
| 103 | static pj_status_t transport_simulate_lost(pjmedia_transport *tp, |
| 104 | pjmedia_dir dir, |
| 105 | unsigned pct_lost); |
| 106 | static pj_status_t transport_destroy (pjmedia_transport *tp); |
| 107 | |
| 108 | |
| 109 | static pjmedia_transport_op transport_udp_op = |
| 110 | { |
| 111 | &transport_get_info, |
| 112 | &transport_attach, |
| 113 | &transport_detach, |
| 114 | &transport_send_rtp, |
| 115 | &transport_send_rtcp, |
| 116 | &transport_send_rtcp2, |
| 117 | &transport_media_create, |
| 118 | &transport_encode_sdp, |
| 119 | &transport_media_start, |
| 120 | &transport_media_stop, |
| 121 | &transport_simulate_lost, |
| 122 | &transport_destroy |
| 123 | }; |
| 124 | |
| 125 | |
| 126 | /** |
| 127 | * Create loopback transport. |
| 128 | */ |
| 129 | PJ_DEF(pj_status_t) pjmedia_transport_loop_create(pjmedia_endpt *endpt, |
| 130 | pjmedia_transport **p_tp) |
| 131 | { |
| 132 | struct transport_loop *tp; |
| 133 | pj_pool_t *pool; |
| 134 | |
| 135 | /* Sanity check */ |
| 136 | PJ_ASSERT_RETURN(endpt && p_tp, PJ_EINVAL); |
| 137 | |
| 138 | /* Create transport structure */ |
| 139 | pool = pjmedia_endpt_create_pool(endpt, "tploop", 512, 512); |
| 140 | if (!pool) |
| 141 | return PJ_ENOMEM; |
| 142 | |
| 143 | tp = PJ_POOL_ZALLOC_T(pool, struct transport_loop); |
| 144 | tp->pool = pool; |
| 145 | pj_ansi_strncpy(tp->base.name, tp->pool->obj_name, PJ_MAX_OBJ_NAME-1); |
| 146 | tp->base.op = &transport_udp_op; |
| 147 | tp->base.type = PJMEDIA_TRANSPORT_TYPE_UDP; |
| 148 | |
| 149 | /* Done */ |
| 150 | *p_tp = &tp->base; |
| 151 | return PJ_SUCCESS; |
| 152 | } |
| 153 | |
| 154 | |
| 155 | PJ_DEF(pj_status_t) pjmedia_transport_loop_disable_rx( pjmedia_transport *tp, |
| 156 | void *user, |
| 157 | pj_bool_t disabled) |
| 158 | { |
| 159 | struct transport_loop *loop = (struct transport_loop*) tp; |
| 160 | unsigned i; |
| 161 | |
| 162 | for (i=0; i<loop->user_cnt; ++i) { |
| 163 | if (loop->users[i].user_data == user) { |
| 164 | loop->users[i].rx_disabled = disabled; |
| 165 | return PJ_SUCCESS; |
| 166 | } |
| 167 | } |
| 168 | pj_assert(!"Invalid stream user"); |
| 169 | return PJ_ENOTFOUND; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Close loopback transport. |
| 174 | */ |
| 175 | static pj_status_t transport_destroy(pjmedia_transport *tp) |
| 176 | { |
| 177 | struct transport_loop *loop = (struct transport_loop*) tp; |
| 178 | |
| 179 | /* Sanity check */ |
| 180 | PJ_ASSERT_RETURN(tp, PJ_EINVAL); |
| 181 | |
| 182 | pj_pool_release(loop->pool); |
| 183 | |
| 184 | return PJ_SUCCESS; |
| 185 | } |
| 186 | |
| 187 | |
| 188 | /* Called to get the transport info */ |
| 189 | static pj_status_t transport_get_info(pjmedia_transport *tp, |
| 190 | pjmedia_transport_info *info) |
| 191 | { |
| 192 | PJ_ASSERT_RETURN(tp && info, PJ_EINVAL); |
| 193 | |
| 194 | info->sock_info.rtp_sock = 1; |
| 195 | pj_sockaddr_in_init(&info->sock_info.rtp_addr_name.ipv4, 0, 0); |
| 196 | info->sock_info.rtcp_sock = 2; |
| 197 | pj_sockaddr_in_init(&info->sock_info.rtcp_addr_name.ipv4, 0, 0); |
| 198 | |
| 199 | return PJ_SUCCESS; |
| 200 | } |
| 201 | |
| 202 | |
| 203 | /* Called by application to initialize the transport */ |
| 204 | static pj_status_t transport_attach( pjmedia_transport *tp, |
| 205 | void *user_data, |
| 206 | const pj_sockaddr_t *rem_addr, |
| 207 | const pj_sockaddr_t *rem_rtcp, |
| 208 | unsigned addr_len, |
| 209 | void (*rtp_cb)(void*, |
| 210 | void*, |
| 211 | pj_ssize_t), |
| 212 | void (*rtcp_cb)(void*, |
| 213 | void*, |
| 214 | pj_ssize_t)) |
| 215 | { |
| 216 | struct transport_loop *loop = (struct transport_loop*) tp; |
| 217 | unsigned i; |
| 218 | const pj_sockaddr *rtcp_addr; |
| 219 | |
| 220 | /* Validate arguments */ |
| 221 | PJ_ASSERT_RETURN(tp && rem_addr && addr_len, PJ_EINVAL); |
| 222 | |
| 223 | /* Must not be "attached" to same user */ |
| 224 | for (i=0; i<loop->user_cnt; ++i) { |
| 225 | PJ_ASSERT_RETURN(loop->users[i].user_data != user_data, |
| 226 | PJ_EINVALIDOP); |
| 227 | } |
| 228 | PJ_ASSERT_RETURN(loop->user_cnt != PJ_ARRAY_SIZE(loop->users), |
| 229 | PJ_ETOOMANY); |
| 230 | |
| 231 | PJ_UNUSED_ARG(rem_rtcp); |
| 232 | PJ_UNUSED_ARG(rtcp_addr); |
| 233 | |
| 234 | /* "Attach" the application: */ |
| 235 | |
| 236 | /* Save the new user */ |
| 237 | loop->users[loop->user_cnt].rtp_cb = rtp_cb; |
| 238 | loop->users[loop->user_cnt].rtcp_cb = rtcp_cb; |
| 239 | loop->users[loop->user_cnt].user_data = user_data; |
| 240 | ++loop->user_cnt; |
| 241 | |
| 242 | return PJ_SUCCESS; |
| 243 | } |
| 244 | |
| 245 | |
| 246 | /* Called by application when it no longer needs the transport */ |
| 247 | static void transport_detach( pjmedia_transport *tp, |
| 248 | void *user_data) |
| 249 | { |
| 250 | struct transport_loop *loop = (struct transport_loop*) tp; |
| 251 | unsigned i; |
| 252 | |
| 253 | pj_assert(tp); |
| 254 | |
| 255 | for (i=0; i<loop->user_cnt; ++i) { |
| 256 | if (loop->users[i].user_data == user_data) |
| 257 | break; |
| 258 | } |
| 259 | |
| 260 | /* Remove this user */ |
| 261 | if (i != loop->user_cnt) { |
| 262 | pj_array_erase(loop->users, sizeof(loop->users[0]), |
| 263 | loop->user_cnt, i); |
| 264 | --loop->user_cnt; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | |
| 269 | /* Called by application to send RTP packet */ |
| 270 | static pj_status_t transport_send_rtp( pjmedia_transport *tp, |
| 271 | const void *pkt, |
| 272 | pj_size_t size) |
| 273 | { |
| 274 | struct transport_loop *loop = (struct transport_loop*)tp; |
| 275 | unsigned i; |
| 276 | |
| 277 | /* Simulate packet lost on TX direction */ |
| 278 | if (loop->tx_drop_pct) { |
| 279 | if ((pj_rand() % 100) <= (int)loop->tx_drop_pct) { |
| 280 | PJ_LOG(5,(loop->base.name, |
| 281 | "TX RTP packet dropped because of pkt lost " |
| 282 | "simulation")); |
| 283 | return PJ_SUCCESS; |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | /* Simulate packet lost on RX direction */ |
| 288 | if (loop->rx_drop_pct) { |
| 289 | if ((pj_rand() % 100) <= (int)loop->rx_drop_pct) { |
| 290 | PJ_LOG(5,(loop->base.name, |
| 291 | "RX RTP packet dropped because of pkt lost " |
| 292 | "simulation")); |
| 293 | return PJ_SUCCESS; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | /* Distribute to users */ |
| 298 | for (i=0; i<loop->user_cnt; ++i) { |
| 299 | if (!loop->users[i].rx_disabled && loop->users[i].rtp_cb) |
| 300 | (*loop->users[i].rtp_cb)(loop->users[i].user_data, (void*)pkt, |
| 301 | size); |
| 302 | } |
| 303 | |
| 304 | return PJ_SUCCESS; |
| 305 | } |
| 306 | |
| 307 | /* Called by application to send RTCP packet */ |
| 308 | static pj_status_t transport_send_rtcp(pjmedia_transport *tp, |
| 309 | const void *pkt, |
| 310 | pj_size_t size) |
| 311 | { |
| 312 | return transport_send_rtcp2(tp, NULL, 0, pkt, size); |
| 313 | } |
| 314 | |
| 315 | |
| 316 | /* Called by application to send RTCP packet */ |
| 317 | static pj_status_t transport_send_rtcp2(pjmedia_transport *tp, |
| 318 | const pj_sockaddr_t *addr, |
| 319 | unsigned addr_len, |
| 320 | const void *pkt, |
| 321 | pj_size_t size) |
| 322 | { |
| 323 | struct transport_loop *loop = (struct transport_loop*)tp; |
| 324 | unsigned i; |
| 325 | |
| 326 | PJ_UNUSED_ARG(addr_len); |
| 327 | PJ_UNUSED_ARG(addr); |
| 328 | |
| 329 | /* Distribute to users */ |
| 330 | for (i=0; i<loop->user_cnt; ++i) { |
| 331 | if (!loop->users[i].rx_disabled && loop->users[i].rtcp_cb) |
| 332 | (*loop->users[i].rtcp_cb)(loop->users[i].user_data, (void*)pkt, |
| 333 | size); |
| 334 | } |
| 335 | |
| 336 | return PJ_SUCCESS; |
| 337 | } |
| 338 | |
| 339 | |
| 340 | static pj_status_t transport_media_create(pjmedia_transport *tp, |
| 341 | pj_pool_t *pool, |
| 342 | unsigned options, |
| 343 | const pjmedia_sdp_session *sdp_remote, |
| 344 | unsigned media_index) |
| 345 | { |
| 346 | PJ_UNUSED_ARG(tp); |
| 347 | PJ_UNUSED_ARG(pool); |
| 348 | PJ_UNUSED_ARG(options); |
| 349 | PJ_UNUSED_ARG(sdp_remote); |
| 350 | PJ_UNUSED_ARG(media_index); |
| 351 | return PJ_SUCCESS; |
| 352 | } |
| 353 | |
| 354 | static pj_status_t transport_encode_sdp(pjmedia_transport *tp, |
| 355 | pj_pool_t *pool, |
| 356 | pjmedia_sdp_session *sdp_local, |
| 357 | const pjmedia_sdp_session *rem_sdp, |
| 358 | unsigned media_index) |
| 359 | { |
| 360 | PJ_UNUSED_ARG(tp); |
| 361 | PJ_UNUSED_ARG(pool); |
| 362 | PJ_UNUSED_ARG(sdp_local); |
| 363 | PJ_UNUSED_ARG(rem_sdp); |
| 364 | PJ_UNUSED_ARG(media_index); |
| 365 | return PJ_SUCCESS; |
| 366 | } |
| 367 | |
| 368 | static pj_status_t transport_media_start(pjmedia_transport *tp, |
| 369 | pj_pool_t *pool, |
| 370 | const pjmedia_sdp_session *sdp_local, |
| 371 | const pjmedia_sdp_session *sdp_remote, |
| 372 | unsigned media_index) |
| 373 | { |
| 374 | PJ_UNUSED_ARG(tp); |
| 375 | PJ_UNUSED_ARG(pool); |
| 376 | PJ_UNUSED_ARG(sdp_local); |
| 377 | PJ_UNUSED_ARG(sdp_remote); |
| 378 | PJ_UNUSED_ARG(media_index); |
| 379 | return PJ_SUCCESS; |
| 380 | } |
| 381 | |
| 382 | static pj_status_t transport_media_stop(pjmedia_transport *tp) |
| 383 | { |
| 384 | PJ_UNUSED_ARG(tp); |
| 385 | return PJ_SUCCESS; |
| 386 | } |
| 387 | |
| 388 | static pj_status_t transport_simulate_lost(pjmedia_transport *tp, |
| 389 | pjmedia_dir dir, |
| 390 | unsigned pct_lost) |
| 391 | { |
| 392 | struct transport_loop *loop = (struct transport_loop*)tp; |
| 393 | |
| 394 | PJ_ASSERT_RETURN(tp && pct_lost <= 100, PJ_EINVAL); |
| 395 | |
| 396 | if (dir & PJMEDIA_DIR_ENCODING) |
| 397 | loop->tx_drop_pct = pct_lost; |
| 398 | |
| 399 | if (dir & PJMEDIA_DIR_DECODING) |
| 400 | loop->rx_drop_pct = pct_lost; |
| 401 | |
| 402 | return PJ_SUCCESS; |
| 403 | } |
| 404 | |