1/* 2 * copyright (c) 2007 Luca Abeni 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg 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 GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include <string.h> 22#include "libavutil/avstring.h" 23#include "libavutil/base64.h" 24#include "libavutil/dict.h" 25#include "libavutil/parseutils.h" 26#include "libavutil/opt.h" 27#include "libavcodec/xiph.h" 28#include "libavcodec/mpeg4audio.h" 29#include "avformat.h" 30#include "internal.h" 31#include "avc.h" 32#include "rtp.h" 33#if CONFIG_NETWORK 34#include "network.h" 35#endif 36 37#if CONFIG_RTP_MUXER 38#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2) 39 40struct sdp_session_level { 41 int sdp_version; /**< protocol version (currently 0) */ 42 int id; /**< session ID */ 43 int version; /**< session version */ 44 int start_time; /**< session start time (NTP time, in seconds), 45 or 0 in case of permanent session */ 46 int end_time; /**< session end time (NTP time, in seconds), 47 or 0 if the session is not bounded */ 48 int ttl; /**< TTL, in case of multicast stream */ 49 const char *user; /**< username of the session's creator */ 50 const char *src_addr; /**< IP address of the machine from which the session was created */ 51 const char *src_type; /**< address type of src_addr */ 52 const char *dst_addr; /**< destination IP address (can be multicast) */ 53 const char *dst_type; /**< destination IP address type */ 54 const char *name; /**< session name (can be an empty string) */ 55}; 56 57static void sdp_write_address(char *buff, int size, const char *dest_addr, 58 const char *dest_type, int ttl) 59{ 60 if (dest_addr) { 61 if (!dest_type) 62 dest_type = "IP4"; 63 if (ttl > 0 && !strcmp(dest_type, "IP4")) { 64 /* The TTL should only be specified for IPv4 multicast addresses, 65 * not for IPv6. */ 66 av_strlcatf(buff, size, "c=IN %s %s/%d\r\n", dest_type, dest_addr, ttl); 67 } else { 68 av_strlcatf(buff, size, "c=IN %s %s\r\n", dest_type, dest_addr); 69 } 70 } 71} 72 73static void sdp_write_header(char *buff, int size, struct sdp_session_level *s) 74{ 75 av_strlcatf(buff, size, "v=%d\r\n" 76 "o=- %d %d IN %s %s\r\n" 77 "s=%s\r\n", 78 s->sdp_version, 79 s->id, s->version, s->src_type, s->src_addr, 80 s->name); 81 sdp_write_address(buff, size, s->dst_addr, s->dst_type, s->ttl); 82 av_strlcatf(buff, size, "t=%d %d\r\n" 83 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n", 84 s->start_time, s->end_time); 85} 86 87#if CONFIG_NETWORK 88static int resolve_destination(char *dest_addr, int size, char *type, 89 int type_size) 90{ 91 struct addrinfo hints = { 0 }, *ai; 92 int is_multicast; 93 94 av_strlcpy(type, "IP4", type_size); 95 if (!dest_addr[0]) 96 return 0; 97 98 /* Resolve the destination, since it must be written 99 * as a numeric IP address in the SDP. */ 100 101 if (getaddrinfo(dest_addr, NULL, &hints, &ai)) 102 return 0; 103 getnameinfo(ai->ai_addr, ai->ai_addrlen, dest_addr, size, 104 NULL, 0, NI_NUMERICHOST); 105#ifdef AF_INET6 106 if (ai->ai_family == AF_INET6) 107 av_strlcpy(type, "IP6", type_size); 108#endif 109 is_multicast = ff_is_multicast_address(ai->ai_addr); 110 freeaddrinfo(ai); 111 return is_multicast; 112} 113#else 114static int resolve_destination(char *dest_addr, int size, char *type, 115 int type_size) 116{ 117 return 0; 118} 119#endif 120 121static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url) 122{ 123 int port; 124 const char *p; 125 char proto[32]; 126 127 av_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url); 128 129 *ttl = 0; 130 131 if (strcmp(proto, "rtp") && strcmp(proto, "srtp")) { 132 /* The url isn't for the actual rtp sessions, 133 * don't parse out anything else than the destination. 134 */ 135 return 0; 136 } 137 138 p = strchr(url, '?'); 139 if (p) { 140 char buff[64]; 141 142 if (av_find_info_tag(buff, sizeof(buff), "ttl", p)) { 143 *ttl = strtol(buff, NULL, 10); 144 } else { 145 *ttl = 5; 146 } 147 } 148 149 return port; 150} 151 152#define MAX_PSET_SIZE 1024 153static char *extradata2psets(AVCodecContext *c) 154{ 155 char *psets, *p; 156 const uint8_t *r; 157 static const char pset_string[] = "; sprop-parameter-sets="; 158 static const char profile_string[] = "; profile-level-id="; 159 uint8_t *orig_extradata = NULL; 160 int orig_extradata_size = 0; 161 const uint8_t *sps = NULL, *sps_end; 162 163 if (c->extradata_size > MAX_EXTRADATA_SIZE) { 164 av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); 165 166 return NULL; 167 } 168 if (c->extradata[0] == 1) { 169 uint8_t *dummy_p; 170 int dummy_int; 171 AVBitStreamFilterContext *bsfc= av_bitstream_filter_init("h264_mp4toannexb"); 172 173 if (!bsfc) { 174 av_log(c, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n"); 175 176 return NULL; 177 } 178 179 orig_extradata_size = c->extradata_size; 180 orig_extradata = av_mallocz(orig_extradata_size + 181 FF_INPUT_BUFFER_PADDING_SIZE); 182 if (!orig_extradata) { 183 av_bitstream_filter_close(bsfc); 184 return NULL; 185 } 186 memcpy(orig_extradata, c->extradata, orig_extradata_size); 187 av_bitstream_filter_filter(bsfc, c, NULL, &dummy_p, &dummy_int, NULL, 0, 0); 188 av_bitstream_filter_close(bsfc); 189 } 190 191 psets = av_mallocz(MAX_PSET_SIZE); 192 if (psets == NULL) { 193 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n"); 194 av_free(orig_extradata); 195 return NULL; 196 } 197 memcpy(psets, pset_string, strlen(pset_string)); 198 p = psets + strlen(pset_string); 199 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size); 200 while (r < c->extradata + c->extradata_size) { 201 const uint8_t *r1; 202 uint8_t nal_type; 203 204 while (!*(r++)); 205 nal_type = *r & 0x1f; 206 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size); 207 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */ 208 r = r1; 209 continue; 210 } 211 if (p != (psets + strlen(pset_string))) { 212 *p = ','; 213 p++; 214 } 215 if (!sps) { 216 sps = r; 217 sps_end = r1; 218 } 219 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) { 220 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %"PTRDIFF_SPECIFIER" %"PTRDIFF_SPECIFIER"!\n", MAX_PSET_SIZE - (p - psets), r1 - r); 221 av_free(psets); 222 223 return NULL; 224 } 225 p += strlen(p); 226 r = r1; 227 } 228 if (sps && sps_end - sps >= 4) { 229 memcpy(p, profile_string, strlen(profile_string)); 230 p += strlen(p); 231 ff_data_to_hex(p, sps + 1, 3, 0); 232 p[6] = '\0'; 233 } 234 if (orig_extradata) { 235 av_free(c->extradata); 236 c->extradata = orig_extradata; 237 c->extradata_size = orig_extradata_size; 238 } 239 240 return psets; 241} 242 243static char *extradata2config(AVCodecContext *c) 244{ 245 char *config; 246 247 if (c->extradata_size > MAX_EXTRADATA_SIZE) { 248 av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); 249 250 return NULL; 251 } 252 config = av_malloc(10 + c->extradata_size * 2); 253 if (config == NULL) { 254 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n"); 255 return NULL; 256 } 257 memcpy(config, "; config=", 9); 258 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0); 259 config[9 + c->extradata_size * 2] = 0; 260 261 return config; 262} 263 264static char *xiph_extradata2config(AVCodecContext *c) 265{ 266 char *config, *encoded_config; 267 uint8_t *header_start[3]; 268 int headers_len, header_len[3], config_len; 269 int first_header_size; 270 271 switch (c->codec_id) { 272 case AV_CODEC_ID_THEORA: 273 first_header_size = 42; 274 break; 275 case AV_CODEC_ID_VORBIS: 276 first_header_size = 30; 277 break; 278 default: 279 av_log(c, AV_LOG_ERROR, "Unsupported Xiph codec ID\n"); 280 return NULL; 281 } 282 283 if (avpriv_split_xiph_headers(c->extradata, c->extradata_size, 284 first_header_size, header_start, 285 header_len) < 0) { 286 av_log(c, AV_LOG_ERROR, "Extradata corrupt.\n"); 287 return NULL; 288 } 289 290 headers_len = header_len[0] + header_len[2]; 291 config_len = 4 + // count 292 3 + // ident 293 2 + // packet size 294 1 + // header count 295 2 + // header size 296 headers_len; // and the rest 297 298 config = av_malloc(config_len); 299 if (!config) 300 goto xiph_fail; 301 302 encoded_config = av_malloc(AV_BASE64_SIZE(config_len)); 303 if (!encoded_config) { 304 av_free(config); 305 goto xiph_fail; 306 } 307 308 config[0] = config[1] = config[2] = 0; 309 config[3] = 1; 310 config[4] = (RTP_XIPH_IDENT >> 16) & 0xff; 311 config[5] = (RTP_XIPH_IDENT >> 8) & 0xff; 312 config[6] = (RTP_XIPH_IDENT ) & 0xff; 313 config[7] = (headers_len >> 8) & 0xff; 314 config[8] = headers_len & 0xff; 315 config[9] = 2; 316 config[10] = header_len[0]; 317 config[11] = 0; // size of comment header; nonexistent 318 memcpy(config + 12, header_start[0], header_len[0]); 319 memcpy(config + 12 + header_len[0], header_start[2], header_len[2]); 320 321 av_base64_encode(encoded_config, AV_BASE64_SIZE(config_len), 322 config, config_len); 323 av_free(config); 324 325 return encoded_config; 326 327xiph_fail: 328 av_log(c, AV_LOG_ERROR, 329 "Not enough memory for configuration string\n"); 330 return NULL; 331} 332 333static int latm_context2profilelevel(AVCodecContext *c) 334{ 335 /* MP4A-LATM 336 * The RTP payload format specification is described in RFC 3016 337 * The encoding specifications are provided in ISO/IEC 14496-3 */ 338 339 int profile_level = 0x2B; 340 341 /* TODO: AAC Profile only supports AAC LC Object Type. 342 * Different Object Types should implement different Profile Levels */ 343 344 if (c->sample_rate <= 24000) { 345 if (c->channels <= 2) 346 profile_level = 0x28; // AAC Profile, Level 1 347 } else if (c->sample_rate <= 48000) { 348 if (c->channels <= 2) { 349 profile_level = 0x29; // AAC Profile, Level 2 350 } else if (c->channels <= 5) { 351 profile_level = 0x2A; // AAC Profile, Level 4 352 } 353 } else if (c->sample_rate <= 96000) { 354 if (c->channels <= 5) { 355 profile_level = 0x2B; // AAC Profile, Level 5 356 } 357 } 358 359 return profile_level; 360} 361 362static char *latm_context2config(AVCodecContext *c) 363{ 364 /* MP4A-LATM 365 * The RTP payload format specification is described in RFC 3016 366 * The encoding specifications are provided in ISO/IEC 14496-3 */ 367 368 uint8_t config_byte[6]; 369 int rate_index; 370 char *config; 371 372 for (rate_index = 0; rate_index < 16; rate_index++) 373 if (avpriv_mpeg4audio_sample_rates[rate_index] == c->sample_rate) 374 break; 375 if (rate_index == 16) { 376 av_log(c, AV_LOG_ERROR, "Unsupported sample rate\n"); 377 return NULL; 378 } 379 380 config_byte[0] = 0x40; 381 config_byte[1] = 0; 382 config_byte[2] = 0x20 | rate_index; 383 config_byte[3] = c->channels << 4; 384 config_byte[4] = 0x3f; 385 config_byte[5] = 0xc0; 386 387 config = av_malloc(6*2+1); 388 if (!config) { 389 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n"); 390 return NULL; 391 } 392 ff_data_to_hex(config, config_byte, 6, 1); 393 config[12] = 0; 394 395 return config; 396} 397 398static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type, AVFormatContext *fmt) 399{ 400 char *config = NULL; 401 402 switch (c->codec_id) { 403 case AV_CODEC_ID_H264: { 404 int mode = 1; 405 if (fmt && fmt->oformat && fmt->oformat->priv_class && 406 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "h264_mode0")) 407 mode = 0; 408 if (c->extradata_size) { 409 config = extradata2psets(c); 410 } 411 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n" 412 "a=fmtp:%d packetization-mode=%d%s\r\n", 413 payload_type, 414 payload_type, mode, config ? config : ""); 415 break; 416 } 417 case AV_CODEC_ID_H263: 418 case AV_CODEC_ID_H263P: 419 /* a=framesize is required by 3GPP TS 26.234 (PSS). It 420 * actually specifies the maximum video size, but we only know 421 * the current size. This is required for playback on Android 422 * stagefright and on Samsung bada. */ 423 if (!fmt || !fmt->oformat->priv_class || 424 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190") || 425 c->codec_id == AV_CODEC_ID_H263P) 426 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n" 427 "a=framesize:%d %d-%d\r\n", 428 payload_type, 429 payload_type, c->width, c->height); 430 break; 431 case AV_CODEC_ID_MPEG4: 432 if (c->extradata_size) { 433 config = extradata2config(c); 434 } 435 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n" 436 "a=fmtp:%d profile-level-id=1%s\r\n", 437 payload_type, 438 payload_type, config ? config : ""); 439 break; 440 case AV_CODEC_ID_AAC: 441 if (fmt && fmt->oformat && fmt->oformat->priv_class && 442 av_opt_flag_is_set(fmt->priv_data, "rtpflags", "latm")) { 443 config = latm_context2config(c); 444 if (!config) 445 return NULL; 446 av_strlcatf(buff, size, "a=rtpmap:%d MP4A-LATM/%d/%d\r\n" 447 "a=fmtp:%d profile-level-id=%d;cpresent=0;config=%s\r\n", 448 payload_type, c->sample_rate, c->channels, 449 payload_type, latm_context2profilelevel(c), config); 450 } else { 451 if (c->extradata_size) { 452 config = extradata2config(c); 453 } else { 454 /* FIXME: maybe we can forge config information based on the 455 * codec parameters... 456 */ 457 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n"); 458 return NULL; 459 } 460 if (config == NULL) { 461 return NULL; 462 } 463 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n" 464 "a=fmtp:%d profile-level-id=1;" 465 "mode=AAC-hbr;sizelength=13;indexlength=3;" 466 "indexdeltalength=3%s\r\n", 467 payload_type, c->sample_rate, c->channels, 468 payload_type, config); 469 } 470 break; 471 case AV_CODEC_ID_PCM_S16BE: 472 if (payload_type >= RTP_PT_PRIVATE) 473 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n", 474 payload_type, 475 c->sample_rate, c->channels); 476 break; 477 case AV_CODEC_ID_PCM_MULAW: 478 if (payload_type >= RTP_PT_PRIVATE) 479 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n", 480 payload_type, 481 c->sample_rate, c->channels); 482 break; 483 case AV_CODEC_ID_PCM_ALAW: 484 if (payload_type >= RTP_PT_PRIVATE) 485 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n", 486 payload_type, 487 c->sample_rate, c->channels); 488 break; 489 case AV_CODEC_ID_AMR_NB: 490 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n" 491 "a=fmtp:%d octet-align=1\r\n", 492 payload_type, c->sample_rate, c->channels, 493 payload_type); 494 break; 495 case AV_CODEC_ID_AMR_WB: 496 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n" 497 "a=fmtp:%d octet-align=1\r\n", 498 payload_type, c->sample_rate, c->channels, 499 payload_type); 500 break; 501 case AV_CODEC_ID_VORBIS: 502 if (c->extradata_size) 503 config = xiph_extradata2config(c); 504 else 505 av_log(c, AV_LOG_ERROR, "Vorbis configuration info missing\n"); 506 if (!config) 507 return NULL; 508 509 av_strlcatf(buff, size, "a=rtpmap:%d vorbis/%d/%d\r\n" 510 "a=fmtp:%d configuration=%s\r\n", 511 payload_type, c->sample_rate, c->channels, 512 payload_type, config); 513 break; 514 case AV_CODEC_ID_THEORA: { 515 const char *pix_fmt; 516 switch (c->pix_fmt) { 517 case AV_PIX_FMT_YUV420P: 518 pix_fmt = "YCbCr-4:2:0"; 519 break; 520 case AV_PIX_FMT_YUV422P: 521 pix_fmt = "YCbCr-4:2:2"; 522 break; 523 case AV_PIX_FMT_YUV444P: 524 pix_fmt = "YCbCr-4:4:4"; 525 break; 526 default: 527 av_log(c, AV_LOG_ERROR, "Unsupported pixel format.\n"); 528 return NULL; 529 } 530 531 if (c->extradata_size) 532 config = xiph_extradata2config(c); 533 else 534 av_log(c, AV_LOG_ERROR, "Theora configuation info missing\n"); 535 if (!config) 536 return NULL; 537 538 av_strlcatf(buff, size, "a=rtpmap:%d theora/90000\r\n" 539 "a=fmtp:%d delivery-method=inline; " 540 "width=%d; height=%d; sampling=%s; " 541 "configuration=%s\r\n", 542 payload_type, payload_type, 543 c->width, c->height, pix_fmt, config); 544 break; 545 } 546 case AV_CODEC_ID_VP8: 547 av_strlcatf(buff, size, "a=rtpmap:%d VP8/90000\r\n", 548 payload_type); 549 break; 550 case AV_CODEC_ID_MJPEG: 551 if (payload_type >= RTP_PT_PRIVATE) 552 av_strlcatf(buff, size, "a=rtpmap:%d JPEG/90000\r\n", 553 payload_type); 554 break; 555 case AV_CODEC_ID_ADPCM_G722: 556 if (payload_type >= RTP_PT_PRIVATE) 557 av_strlcatf(buff, size, "a=rtpmap:%d G722/%d/%d\r\n", 558 payload_type, 559 8000, c->channels); 560 break; 561 case AV_CODEC_ID_ADPCM_G726: { 562 if (payload_type >= RTP_PT_PRIVATE) 563 av_strlcatf(buff, size, "a=rtpmap:%d G726-%d/%d\r\n", 564 payload_type, 565 c->bits_per_coded_sample*8, 566 c->sample_rate); 567 break; 568 } 569 case AV_CODEC_ID_ILBC: 570 av_strlcatf(buff, size, "a=rtpmap:%d iLBC/%d\r\n" 571 "a=fmtp:%d mode=%d\r\n", 572 payload_type, c->sample_rate, 573 payload_type, c->block_align == 38 ? 20 : 30); 574 break; 575 case AV_CODEC_ID_SPEEX: 576 av_strlcatf(buff, size, "a=rtpmap:%d speex/%d\r\n", 577 payload_type, c->sample_rate); 578 if (c->codec) { 579 const char *mode; 580 uint64_t vad_option; 581 582 if (c->flags & CODEC_FLAG_QSCALE) 583 mode = "on"; 584 else if (!av_opt_get_int(c, "vad", AV_OPT_FLAG_ENCODING_PARAM, &vad_option) && vad_option) 585 mode = "vad"; 586 else 587 mode = "off"; 588 589 av_strlcatf(buff, size, "a=fmtp:%d vbr=%s\r\n", 590 payload_type, mode); 591 } 592 break; 593 case AV_CODEC_ID_OPUS: 594 av_strlcatf(buff, size, "a=rtpmap:%d opus/48000\r\n", 595 payload_type); 596 break; 597 default: 598 /* Nothing special to do here... */ 599 break; 600 } 601 602 av_free(config); 603 604 return buff; 605} 606 607void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, 608 const char *dest_addr, const char *dest_type, 609 int port, int ttl, AVFormatContext *fmt) 610{ 611 AVCodecContext *c = st->codec; 612 const char *type; 613 int payload_type; 614 615 payload_type = ff_rtp_get_payload_type(fmt, c, idx); 616 617 switch (c->codec_type) { 618 case AVMEDIA_TYPE_VIDEO : type = "video" ; break; 619 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break; 620 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break; 621 default : type = "application"; break; 622 } 623 624 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type); 625 sdp_write_address(buff, size, dest_addr, dest_type, ttl); 626 if (c->bit_rate) { 627 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000); 628 } 629 630 sdp_write_media_attributes(buff, size, c, payload_type, fmt); 631} 632 633int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size) 634{ 635 AVDictionaryEntry *title = av_dict_get(ac[0]->metadata, "title", NULL, 0); 636 struct sdp_session_level s = { 0 }; 637 int i, j, port, ttl, is_multicast, index = 0; 638 char dst[32], dst_type[5]; 639 640 memset(buf, 0, size); 641 s.user = "-"; 642 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */ 643 s.src_type = "IP4"; 644 s.name = title ? title->value : "No Name"; 645 646 port = 0; 647 ttl = 0; 648 if (n_files == 1) { 649 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename); 650 is_multicast = resolve_destination(dst, sizeof(dst), dst_type, 651 sizeof(dst_type)); 652 if (!is_multicast) 653 ttl = 0; 654 if (dst[0]) { 655 s.dst_addr = dst; 656 s.dst_type = dst_type; 657 s.ttl = ttl; 658 if (!strcmp(dst_type, "IP6")) { 659 s.src_addr = "::1"; 660 s.src_type = "IP6"; 661 } 662 } 663 } 664 sdp_write_header(buf, size, &s); 665 666 dst[0] = 0; 667 for (i = 0; i < n_files; i++) { 668 if (n_files != 1) { 669 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename); 670 is_multicast = resolve_destination(dst, sizeof(dst), dst_type, 671 sizeof(dst_type)); 672 if (!is_multicast) 673 ttl = 0; 674 } 675 for (j = 0; j < ac[i]->nb_streams; j++) { 676 ff_sdp_write_media(buf, size, ac[i]->streams[j], index++, 677 dst[0] ? dst : NULL, dst_type, 678 (port > 0) ? port + j * 2 : 0, 679 ttl, ac[i]); 680 if (port <= 0) { 681 av_strlcatf(buf, size, 682 "a=control:streamid=%d\r\n", i + j); 683 } 684 if (ac[i]->pb && ac[i]->pb->av_class) { 685 uint8_t *crypto_suite = NULL, *crypto_params = NULL; 686 av_opt_get(ac[i]->pb, "srtp_out_suite", AV_OPT_SEARCH_CHILDREN, 687 &crypto_suite); 688 av_opt_get(ac[i]->pb, "srtp_out_params", AV_OPT_SEARCH_CHILDREN, 689 &crypto_params); 690 if (crypto_suite && crypto_suite[0]) 691 av_strlcatf(buf, size, 692 "a=crypto:1 %s inline:%s\r\n", 693 crypto_suite, crypto_params); 694 av_free(crypto_suite); 695 av_free(crypto_params); 696 } 697 } 698 } 699 700 return 0; 701} 702#else 703int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size) 704{ 705 return AVERROR(ENOSYS); 706} 707 708void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, 709 const char *dest_addr, const char *dest_type, 710 int port, int ttl, AVFormatContext *fmt) 711{ 712} 713#endif 714