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 "avformat.h" 25#include "internal.h" 26#include "avc.h" 27#include "rtp.h" 28#if CONFIG_NETWORK 29#include "network.h" 30#endif 31 32#if CONFIG_RTP_MUXER 33#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2) 34 35struct sdp_session_level { 36 int sdp_version; /**< protocol version (currently 0) */ 37 int id; /**< session ID */ 38 int version; /**< session version */ 39 int start_time; /**< session start time (NTP time, in seconds), 40 or 0 in case of permanent session */ 41 int end_time; /**< session end time (NTP time, in seconds), 42 or 0 if the session is not bounded */ 43 int ttl; /**< TTL, in case of multicast stream */ 44 const char *user; /**< username of the session's creator */ 45 const char *src_addr; /**< IP address of the machine from which the session was created */ 46 const char *dst_addr; /**< destination IP address (can be multicast) */ 47 const char *name; /**< session name (can be an empty string) */ 48}; 49 50static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl) 51{ 52 if (dest_addr) { 53 if (ttl > 0) { 54 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl); 55 } else { 56 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr); 57 } 58 } 59} 60 61static void sdp_write_header(char *buff, int size, struct sdp_session_level *s) 62{ 63 av_strlcatf(buff, size, "v=%d\r\n" 64 "o=- %d %d IN IP4 %s\r\n" 65 "s=%s\r\n", 66 s->sdp_version, 67 s->id, s->version, s->src_addr, 68 s->name); 69 sdp_write_address(buff, size, s->dst_addr, s->ttl); 70 av_strlcatf(buff, size, "t=%d %d\r\n" 71 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n", 72 s->start_time, s->end_time); 73} 74 75#if CONFIG_NETWORK 76static void resolve_destination(char *dest_addr, int size) 77{ 78 struct addrinfo hints, *ai, *cur; 79 80 if (!dest_addr[0]) 81 return; 82 83 /* Resolve the destination, since it must be written 84 * as a numeric IP address in the SDP. */ 85 86 memset(&hints, 0, sizeof(hints)); 87 /* We only support IPv4 addresses in the SDP at the moment. */ 88 hints.ai_family = AF_INET; 89 if (getaddrinfo(dest_addr, NULL, &hints, &ai)) 90 return; 91 for (cur = ai; cur; cur = cur->ai_next) { 92 if (cur->ai_family == AF_INET) { 93 getnameinfo(cur->ai_addr, cur->ai_addrlen, dest_addr, size, 94 NULL, 0, NI_NUMERICHOST); 95 break; 96 } 97 } 98 freeaddrinfo(ai); 99} 100#else 101static void resolve_destination(char *dest_addr, int size) 102{ 103} 104#endif 105 106static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url) 107{ 108 int port; 109 const char *p; 110 char proto[32]; 111 112 ff_url_split(proto, sizeof(proto), NULL, 0, dest_addr, size, &port, NULL, 0, url); 113 114 *ttl = 0; 115 116 if (strcmp(proto, "rtp")) { 117 /* The url isn't for the actual rtp sessions, 118 * don't parse out anything else than the destination. 119 */ 120 return 0; 121 } 122 123 p = strchr(url, '?'); 124 if (p) { 125 char buff[64]; 126 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p); 127 128 if (is_multicast) { 129 if (find_info_tag(buff, sizeof(buff), "ttl", p)) { 130 *ttl = strtol(buff, NULL, 10); 131 } else { 132 *ttl = 5; 133 } 134 } 135 } 136 137 return port; 138} 139 140#define MAX_PSET_SIZE 1024 141static char *extradata2psets(AVCodecContext *c) 142{ 143 char *psets, *p; 144 const uint8_t *r; 145 const char *pset_string = "; sprop-parameter-sets="; 146 147 if (c->extradata_size > MAX_EXTRADATA_SIZE) { 148 av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); 149 150 return NULL; 151 } 152 153 psets = av_mallocz(MAX_PSET_SIZE); 154 if (psets == NULL) { 155 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n"); 156 return NULL; 157 } 158 memcpy(psets, pset_string, strlen(pset_string)); 159 p = psets + strlen(pset_string); 160 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size); 161 while (r < c->extradata + c->extradata_size) { 162 const uint8_t *r1; 163 uint8_t nal_type; 164 165 while (!*(r++)); 166 nal_type = *r & 0x1f; 167 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size); 168 if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */ 169 r = r1; 170 continue; 171 } 172 if (p != (psets + strlen(pset_string))) { 173 *p = ','; 174 p++; 175 } 176 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) { 177 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r); 178 av_free(psets); 179 180 return NULL; 181 } 182 p += strlen(p); 183 r = r1; 184 } 185 186 return psets; 187} 188 189static char *extradata2config(AVCodecContext *c) 190{ 191 char *config; 192 193 if (c->extradata_size > MAX_EXTRADATA_SIZE) { 194 av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); 195 196 return NULL; 197 } 198 config = av_malloc(10 + c->extradata_size * 2); 199 if (config == NULL) { 200 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n"); 201 return NULL; 202 } 203 memcpy(config, "; config=", 9); 204 ff_data_to_hex(config + 9, c->extradata, c->extradata_size, 0); 205 config[9 + c->extradata_size * 2] = 0; 206 207 return config; 208} 209 210static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type) 211{ 212 char *config = NULL; 213 214 switch (c->codec_id) { 215 case CODEC_ID_H264: 216 if (c->extradata_size) { 217 config = extradata2psets(c); 218 } 219 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n" 220 "a=fmtp:%d packetization-mode=1%s\r\n", 221 payload_type, 222 payload_type, config ? config : ""); 223 break; 224 case CODEC_ID_H263: 225 case CODEC_ID_H263P: 226 av_strlcatf(buff, size, "a=rtpmap:%d H263-2000/90000\r\n", payload_type); 227 break; 228 case CODEC_ID_MPEG4: 229 if (c->extradata_size) { 230 config = extradata2config(c); 231 } 232 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n" 233 "a=fmtp:%d profile-level-id=1%s\r\n", 234 payload_type, 235 payload_type, config ? config : ""); 236 break; 237 case CODEC_ID_AAC: 238 if (c->extradata_size) { 239 config = extradata2config(c); 240 } else { 241 /* FIXME: maybe we can forge config information based on the 242 * codec parameters... 243 */ 244 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n"); 245 return NULL; 246 } 247 if (config == NULL) { 248 return NULL; 249 } 250 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n" 251 "a=fmtp:%d profile-level-id=1;" 252 "mode=AAC-hbr;sizelength=13;indexlength=3;" 253 "indexdeltalength=3%s\r\n", 254 payload_type, c->sample_rate, c->channels, 255 payload_type, config); 256 break; 257 case CODEC_ID_PCM_S16BE: 258 if (payload_type >= RTP_PT_PRIVATE) 259 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n", 260 payload_type, 261 c->sample_rate, c->channels); 262 break; 263 case CODEC_ID_PCM_MULAW: 264 if (payload_type >= RTP_PT_PRIVATE) 265 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n", 266 payload_type, 267 c->sample_rate, c->channels); 268 break; 269 case CODEC_ID_PCM_ALAW: 270 if (payload_type >= RTP_PT_PRIVATE) 271 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n", 272 payload_type, 273 c->sample_rate, c->channels); 274 break; 275 case CODEC_ID_AMR_NB: 276 av_strlcatf(buff, size, "a=rtpmap:%d AMR/%d/%d\r\n" 277 "a=fmtp:%d octet-align=1\r\n", 278 payload_type, c->sample_rate, c->channels, 279 payload_type); 280 break; 281 case CODEC_ID_AMR_WB: 282 av_strlcatf(buff, size, "a=rtpmap:%d AMR-WB/%d/%d\r\n" 283 "a=fmtp:%d octet-align=1\r\n", 284 payload_type, c->sample_rate, c->channels, 285 payload_type); 286 break; 287 default: 288 /* Nothing special to do here... */ 289 break; 290 } 291 292 av_free(config); 293 294 return buff; 295} 296 297void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl) 298{ 299 const char *type; 300 int payload_type; 301 302 payload_type = ff_rtp_get_payload_type(c); 303 if (payload_type < 0) { 304 payload_type = RTP_PT_PRIVATE + (c->codec_type == AVMEDIA_TYPE_AUDIO); 305 } 306 307 switch (c->codec_type) { 308 case AVMEDIA_TYPE_VIDEO : type = "video" ; break; 309 case AVMEDIA_TYPE_AUDIO : type = "audio" ; break; 310 case AVMEDIA_TYPE_SUBTITLE: type = "text" ; break; 311 default : type = "application"; break; 312 } 313 314 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type); 315 sdp_write_address(buff, size, dest_addr, ttl); 316 if (c->bit_rate) { 317 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000); 318 } 319 320 sdp_write_media_attributes(buff, size, c, payload_type); 321} 322 323int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size) 324{ 325 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0); 326 struct sdp_session_level s; 327 int i, j, port, ttl; 328 char dst[32]; 329 330 memset(buff, 0, size); 331 memset(&s, 0, sizeof(struct sdp_session_level)); 332 s.user = "-"; 333 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */ 334 s.name = title ? title->value : "No Name"; 335 336 port = 0; 337 ttl = 0; 338 if (n_files == 1) { 339 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename); 340 resolve_destination(dst, sizeof(dst)); 341 if (dst[0]) { 342 s.dst_addr = dst; 343 s.ttl = ttl; 344 } 345 } 346 sdp_write_header(buff, size, &s); 347 348 dst[0] = 0; 349 for (i = 0; i < n_files; i++) { 350 if (n_files != 1) { 351 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename); 352 resolve_destination(dst, sizeof(dst)); 353 } 354 for (j = 0; j < ac[i]->nb_streams; j++) { 355 ff_sdp_write_media(buff, size, 356 ac[i]->streams[j]->codec, dst[0] ? dst : NULL, 357 (port > 0) ? port + j * 2 : 0, ttl); 358 if (port <= 0) { 359 av_strlcatf(buff, size, 360 "a=control:streamid=%d\r\n", i + j); 361 } 362 } 363 } 364 365 return 0; 366} 367#else 368int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size) 369{ 370 return AVERROR(ENOSYS); 371} 372 373void ff_sdp_write_media(char *buff, int size, AVCodecContext *c, 374 const char *dest_addr, int port, int ttl) 375{ 376} 377#endif 378