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 "libavutil/avstring.h" 22#include "libavutil/base64.h" 23#include "avformat.h" 24#include "internal.h" 25#include "avc.h" 26#include "rtp.h" 27 28#if CONFIG_RTP_MUXER 29#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2) 30 31struct sdp_session_level { 32 int sdp_version; /**< protocol version (currently 0) */ 33 int id; /**< session ID */ 34 int version; /**< session version */ 35 int start_time; /**< session start time (NTP time, in seconds), 36 or 0 in case of permanent session */ 37 int end_time; /**< session end time (NTP time, in seconds), 38 or 0 if the session is not bounded */ 39 int ttl; /**< TTL, in case of multicast stream */ 40 const char *user; /**< username of the session's creator */ 41 const char *src_addr; /**< IP address of the machine from which the session was created */ 42 const char *dst_addr; /**< destination IP address (can be multicast) */ 43 const char *name; /**< session name (can be an empty string) */ 44}; 45 46static void sdp_write_address(char *buff, int size, const char *dest_addr, int ttl) 47{ 48 if (dest_addr) { 49 if (ttl > 0) { 50 av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl); 51 } else { 52 av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr); 53 } 54 } 55} 56 57static void sdp_write_header(char *buff, int size, struct sdp_session_level *s) 58{ 59 av_strlcatf(buff, size, "v=%d\r\n" 60 "o=- %d %d IN IP4 %s\r\n" 61 "t=%d %d\r\n" 62 "s=%s\r\n" 63 "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n", 64 s->sdp_version, 65 s->id, s->version, s->src_addr, 66 s->start_time, s->end_time, 67 s->name); 68 sdp_write_address(buff, size, s->dst_addr, s->ttl); 69} 70 71static int sdp_get_address(char *dest_addr, int size, int *ttl, const char *url) 72{ 73 int port; 74 const char *p; 75 76 url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url); 77 78 *ttl = 0; 79 p = strchr(url, '?'); 80 if (p) { 81 char buff[64]; 82 int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p); 83 84 if (is_multicast) { 85 if (find_info_tag(buff, sizeof(buff), "ttl", p)) { 86 *ttl = strtol(buff, NULL, 10); 87 } else { 88 *ttl = 5; 89 } 90 } 91 } 92 93 return port; 94} 95 96#define MAX_PSET_SIZE 1024 97static char *extradata2psets(AVCodecContext *c) 98{ 99 char *psets, *p; 100 const uint8_t *r; 101 const char *pset_string = "; sprop-parameter-sets="; 102 103 if (c->extradata_size > MAX_EXTRADATA_SIZE) { 104 av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); 105 106 return NULL; 107 } 108 109 psets = av_mallocz(MAX_PSET_SIZE); 110 if (psets == NULL) { 111 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n"); 112 return NULL; 113 } 114 memcpy(psets, pset_string, strlen(pset_string)); 115 p = psets + strlen(pset_string); 116 r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size); 117 while (r < c->extradata + c->extradata_size) { 118 const uint8_t *r1; 119 120 while (!*(r++)); 121 r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size); 122 if (p != (psets + strlen(pset_string))) { 123 *p = ','; 124 p++; 125 } 126 if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) { 127 av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r); 128 av_free(psets); 129 130 return NULL; 131 } 132 p += strlen(p); 133 r = r1; 134 } 135 136 return psets; 137} 138 139static char *extradata2config(AVCodecContext *c) 140{ 141 char *config; 142 143 if (c->extradata_size > MAX_EXTRADATA_SIZE) { 144 av_log(c, AV_LOG_ERROR, "Too much extradata!\n"); 145 146 return NULL; 147 } 148 config = av_malloc(10 + c->extradata_size * 2); 149 if (config == NULL) { 150 av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n"); 151 return NULL; 152 } 153 memcpy(config, "; config=", 9); 154 ff_data_to_hex(config + 9, c->extradata, c->extradata_size); 155 config[9 + c->extradata_size * 2] = 0; 156 157 return config; 158} 159 160static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type) 161{ 162 char *config = NULL; 163 164 switch (c->codec_id) { 165 case CODEC_ID_H264: 166 if (c->extradata_size) { 167 config = extradata2psets(c); 168 } 169 av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n" 170 "a=fmtp:%d packetization-mode=1%s\r\n", 171 payload_type, 172 payload_type, config ? config : ""); 173 break; 174 case CODEC_ID_MPEG4: 175 if (c->extradata_size) { 176 config = extradata2config(c); 177 } 178 av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n" 179 "a=fmtp:%d profile-level-id=1%s\r\n", 180 payload_type, 181 payload_type, config ? config : ""); 182 break; 183 case CODEC_ID_AAC: 184 if (c->extradata_size) { 185 config = extradata2config(c); 186 } else { 187 /* FIXME: maybe we can forge config information based on the 188 * codec parameters... 189 */ 190 av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n"); 191 return NULL; 192 } 193 if (config == NULL) { 194 return NULL; 195 } 196 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n" 197 "a=fmtp:%d profile-level-id=1;" 198 "mode=AAC-hbr;sizelength=13;indexlength=3;" 199 "indexdeltalength=3%s\r\n", 200 payload_type, c->sample_rate, c->channels, 201 payload_type, config); 202 break; 203 case CODEC_ID_PCM_S16BE: 204 if (payload_type >= 96) 205 av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n", 206 payload_type, 207 c->sample_rate, c->channels); 208 break; 209 case CODEC_ID_PCM_MULAW: 210 if (payload_type >= 96) 211 av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n", 212 payload_type, 213 c->sample_rate, c->channels); 214 break; 215 case CODEC_ID_PCM_ALAW: 216 if (payload_type >= 96) 217 av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n", 218 payload_type, 219 c->sample_rate, c->channels); 220 break; 221 default: 222 /* Nothing special to do here... */ 223 break; 224 } 225 226 av_free(config); 227 228 return buff; 229} 230 231static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl) 232{ 233 const char *type; 234 int payload_type; 235 236 payload_type = ff_rtp_get_payload_type(c); 237 if (payload_type < 0) { 238 payload_type = 96; /* FIXME: how to assign a private pt? rtp.c is broken too */ 239 } 240 241 switch (c->codec_type) { 242 case CODEC_TYPE_VIDEO : type = "video" ; break; 243 case CODEC_TYPE_AUDIO : type = "audio" ; break; 244 case CODEC_TYPE_SUBTITLE: type = "text" ; break; 245 default : type = "application"; break; 246 } 247 248 av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type); 249 sdp_write_address(buff, size, dest_addr, ttl); 250 if (c->bit_rate) { 251 av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000); 252 } 253 254 sdp_write_media_attributes(buff, size, c, payload_type); 255} 256 257int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size) 258{ 259 AVMetadataTag *title = av_metadata_get(ac[0]->metadata, "title", NULL, 0); 260 struct sdp_session_level s; 261 int i, j, port, ttl; 262 char dst[32]; 263 264 memset(buff, 0, size); 265 memset(&s, 0, sizeof(struct sdp_session_level)); 266 s.user = "-"; 267 s.src_addr = "127.0.0.1"; /* FIXME: Properly set this */ 268 s.name = title ? title->value : "No Name"; 269 270 port = 0; 271 ttl = 0; 272 if (n_files == 1) { 273 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[0]->filename); 274 if (port > 0) { 275 s.dst_addr = dst; 276 s.ttl = ttl; 277 } 278 } 279 sdp_write_header(buff, size, &s); 280 281 dst[0] = 0; 282 for (i = 0; i < n_files; i++) { 283 if (n_files != 1) { 284 port = sdp_get_address(dst, sizeof(dst), &ttl, ac[i]->filename); 285 } 286 for (j = 0; j < ac[i]->nb_streams; j++) { 287 sdp_write_media(buff, size, 288 ac[i]->streams[j]->codec, dst[0] ? dst : NULL, 289 (port > 0) ? port + j * 2 : 0, ttl); 290 if (port <= 0) { 291 av_strlcatf(buff, size, 292 "a=control:streamid=%d\r\n", i + j); 293 } 294 } 295 } 296 297 return 0; 298} 299#else 300int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size) 301{ 302 return AVERROR(ENOSYS); 303} 304#endif 305