libavformat/rtsp.c

   1 /*
   2  * RTSP/SDP client
   3  * Copyright (c) 2002 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include "avformat.h"
  22
  23 #include <sys/time.h>
  24 #include <unistd.h> /* for select() prototype */
  25 #include "network.h"
  26 #include "avstring.h"
  27
  28 #include "rtp_internal.h"
  29
  30 //#define DEBUG
  31 //#define DEBUG_RTP_TCP
  32
  33 enum RTSPClientState {
  34     RTSP_STATE_IDLE,
  35     RTSP_STATE_PLAYING,
  36     RTSP_STATE_PAUSED,
  37 };
  38
  39 typedef struct RTSPState {
  40     URLContext *rtsp_hd; /* RTSP TCP connexion handle */
  41     int nb_rtsp_streams;
  42     struct RTSPStream **rtsp_streams;
  43
  44     enum RTSPClientState state;
  45     int64_t seek_timestamp;
  46
  47     /* XXX: currently we use unbuffered input */
  48     //    ByteIOContext rtsp_gb;
  49     int seq;        /* RTSP command sequence number */
  50     char session_id[512];
  51     enum RTSPProtocol protocol;
  52     char last_reply[2048]; /* XXX: allocate ? */
  53     RTPDemuxContext *cur_rtp;
  54 } RTSPState;
  55
  56 typedef struct RTSPStream {
  57     URLContext *rtp_handle; /* RTP stream handle */
  58     RTPDemuxContext *rtp_ctx; /* RTP parse context */
  59
  60     int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
  61     int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
  62     char control_url[1024]; /* url for this stream (from SDP) */
  63
  64     int sdp_port; /* port (from SDP content - not used in RTSP) */
  65     struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
  66     int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
  67     int sdp_payload_type; /* payload type - only used in SDP */
  68     rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
  69
  70     RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
  71     void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
  72 } RTSPStream;
  73
  74 static int rtsp_read_play(AVFormatContext *s);
  75
  76 /* XXX: currently, the only way to change the protocols consists in
  77    changing this variable */
  78
  79 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
  80
  81 static int rtsp_probe(AVProbeData *p)
  82 {
  83     if (av_strstart(p->filename, "rtsp:", NULL))
  84         return AVPROBE_SCORE_MAX;
  85     return 0;
  86 }
  87
  88 static int redir_isspace(int c)
  89 {
  90     return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
  91 }
  92
  93 static void skip_spaces(const char **pp)
  94 {
  95     const char *p;
  96     p = *pp;
  97     while (redir_isspace(*p))
  98         p++;
  99     *pp = p;
 100 }
 101
 102 static void get_word_sep(char *buf, int buf_size, const char *sep,
 103                          const char **pp)
 104 {
 105     const char *p;
 106     char *q;
 107
 108     p = *pp;
 109     if (*p == '/')
 110         p++;
 111     skip_spaces(&p);
 112     q = buf;
 113     while (!strchr(sep, *p) && *p != '\0') {
 114         if ((q - buf) < buf_size - 1)
 115             *q++ = *p;
 116         p++;
 117     }
 118     if (buf_size > 0)
 119         *q = '\0';
 120     *pp = p;
 121 }
 122
 123 static void get_word(char *buf, int buf_size, const char **pp)
 124 {
 125     const char *p;
 126     char *q;
 127
 128     p = *pp;
 129     skip_spaces(&p);
 130     q = buf;
 131     while (!redir_isspace(*p) && *p != '\0') {
 132         if ((q - buf) < buf_size - 1)
 133             *q++ = *p;
 134         p++;
 135     }
 136     if (buf_size > 0)
 137         *q = '\0';
 138     *pp = p;
 139 }
 140
 141 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 142    params>] */
 143 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 144 {
 145     char buf[256];
 146     int i;
 147     AVCodec *c;
 148     const char *c_name;
 149
 150     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 151        see if we can handle this kind of payload */
 152     get_word_sep(buf, sizeof(buf), "/", &p);
 153     if (payload_type >= RTP_PT_PRIVATE) {
 154         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 155         while(handler) {
 156             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 157                 codec->codec_id = handler->codec_id;
 158                 rtsp_st->dynamic_handler= handler;
 159                 if(handler->open) {
 160                     rtsp_st->dynamic_protocol_context= handler->open();
 161                 }
 162                 break;
 163             }
 164             handler= handler->next;
 165         }
 166     } else {
 167         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 168         /* search into AVRtpPayloadTypes[] */
 169         for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
 170             if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec->codec_type == AVRtpPayloadTypes[i].codec_type)){
 171                 codec->codec_id = AVRtpPayloadTypes[i].codec_id;
 172                 break;
 173             }
 174     }
 175
 176     c = avcodec_find_decoder(codec->codec_id);
 177     if (c && c->name)
 178         c_name = c->name;
 179     else
 180         c_name = (char *)NULL;
 181
 182     if (c_name) {
 183         get_word_sep(buf, sizeof(buf), "/", &p);
 184         i = atoi(buf);
 185         switch (codec->codec_type) {
 186             case CODEC_TYPE_AUDIO:
 187                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 188                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 189                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 190                 if (i > 0) {
 191                     codec->sample_rate = i;
 192                     get_word_sep(buf, sizeof(buf), "/", &p);
 193                     i = atoi(buf);
 194                     if (i > 0)
 195                         codec->channels = i;
 196                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 197                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 198                 }
 199                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 200                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 201                 break;
 202             case CODEC_TYPE_VIDEO:
 203                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 204                 break;
 205             default:
 206                 break;
 207         }
 208         return 0;
 209     }
 210
 211     return -1;
 212 }
 213
 214 /* return the length and optionnaly the data */
 215 static int hex_to_data(uint8_t *data, const char *p)
 216 {
 217     int c, len, v;
 218
 219     len = 0;
 220     v = 1;
 221     for(;;) {
 222         skip_spaces(&p);
 223         if (p == '\0')
 224             break;
 225         c = toupper((unsigned char)*p++);
 226         if (c >= '0' && c <= '9')
 227             c = c - '0';
 228         else if (c >= 'A' && c <= 'F')
 229             c = c - 'A' + 10;
 230         else
 231             break;
 232         v = (v << 4) | c;
 233         if (v & 0x100) {
 234             if (data)
 235                 data[len] = v;
 236             len++;
 237             v = 1;
 238         }
 239     }
 240     return len;
 241 }
 242
 243 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 244 {
 245     switch (codec->codec_id) {
 246         case CODEC_ID_MPEG4:
 247         case CODEC_ID_AAC:
 248             if (!strcmp(attr, "config")) {
 249                 /* decode the hexa encoded parameter */
 250                 int len = hex_to_data(NULL, value);
 251                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 252                 if (!codec->extradata)
 253                     return;
 254                 codec->extradata_size = len;
 255                 hex_to_data(codec->extradata, value);
 256             }
 257             break;
 258         default:
 259             break;
 260     }
 261     return;
 262 }
 263
 264 typedef struct attrname_map
 265 {
 266     const char *str;
 267     uint16_t type;
 268     uint32_t offset;
 269 } attrname_map_t;
 270
 271 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 272 #define ATTR_NAME_TYPE_INT 0
 273 #define ATTR_NAME_TYPE_STR 1
 274 static attrname_map_t attr_names[]=
 275 {
 276     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
 277     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
 278     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
 279     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
 280     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
 281     {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
 282     {NULL, -1, -1},
 283 };
 284
 285 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 286 * because it is used in rtp_h264.c, which is forthcoming.
 287 */
 288 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 289 {
 290     skip_spaces(p);
 291     if(**p)
 292     {
 293         get_word_sep(attr, attr_size, "=", p);
 294         if (**p == '=')
 295             (*p)++;
 296         get_word_sep(value, value_size, ";", p);
 297         if (**p == ';')
 298             (*p)++;
 299         return 1;
 300     }
 301     return 0;
 302 }
 303
 304 /* parse a SDP line and save stream attributes */
 305 static void sdp_parse_fmtp(AVStream *st, const char *p)
 306 {
 307     char attr[256];
 308     char value[4096];
 309     int i;
 310
 311     RTSPStream *rtsp_st = st->priv_data;
 312     AVCodecContext *codec = st->codec;
 313     rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
 314
 315     /* loop on each attribute */
 316     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 317     {
 318         /* grab the codec extra_data from the config parameter of the fmtp line */
 319         sdp_parse_fmtp_config(codec, attr, value);
 320         /* Looking for a known attribute */
 321         for (i = 0; attr_names[i].str; ++i) {
 322             if (!strcasecmp(attr, attr_names[i].str)) {
 323                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 324                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 325                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 326                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 327             }
 328         }
 329     }
 330 }
 331
 332 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 333  *  and end time.
 334  *  Used for seeking in the rtp stream.
 335  */
 336 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 337 {
 338     char buf[256];
 339
 340     skip_spaces(&p);
 341     if (!av_stristart(p, "npt=", &p))
 342         return;
 343
 344     *start = AV_NOPTS_VALUE;
 345     *end = AV_NOPTS_VALUE;
 346
 347     get_word_sep(buf, sizeof(buf), "-", &p);
 348     *start = parse_date(buf, 1);
 349     if (*p == '-') {
 350         p++;
 351         get_word_sep(buf, sizeof(buf), "-", &p);
 352         *end = parse_date(buf, 1);
 353     }
 354 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 355 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 356 }
 357
 358 typedef struct SDPParseState {
 359     /* SDP only */
 360     struct in_addr default_ip;
 361     int default_ttl;
 362 } SDPParseState;
 363
 364 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 365                            int letter, const char *buf)
 366 {
 367     RTSPState *rt = s->priv_data;
 368     char buf1[64], st_type[64];
 369     const char *p;
 370     int codec_type, payload_type, i;
 371     AVStream *st;
 372     RTSPStream *rtsp_st;
 373     struct in_addr sdp_ip;
 374     int ttl;
 375
 376 #ifdef DEBUG
 377     printf("sdp: %c='%s'\n", letter, buf);
 378 #endif
 379
 380     p = buf;
 381     switch(letter) {
 382     case 'c':
 383         get_word(buf1, sizeof(buf1), &p);
 384         if (strcmp(buf1, "IN") != 0)
 385             return;
 386         get_word(buf1, sizeof(buf1), &p);
 387         if (strcmp(buf1, "IP4") != 0)
 388             return;
 389         get_word_sep(buf1, sizeof(buf1), "/", &p);
 390         if (inet_aton(buf1, &sdp_ip) == 0)
 391             return;
 392         ttl = 16;
 393         if (*p == '/') {
 394             p++;
 395             get_word_sep(buf1, sizeof(buf1), "/", &p);
 396             ttl = atoi(buf1);
 397         }
 398         if (s->nb_streams == 0) {
 399             s1->default_ip = sdp_ip;
 400             s1->default_ttl = ttl;
 401         } else {
 402             st = s->streams[s->nb_streams - 1];
 403             rtsp_st = st->priv_data;
 404             rtsp_st->sdp_ip = sdp_ip;
 405             rtsp_st->sdp_ttl = ttl;
 406         }
 407         break;
 408     case 's':
 409         av_strlcpy(s->title, p, sizeof(s->title));
 410         break;
 411     case 'i':
 412         if (s->nb_streams == 0) {
 413             av_strlcpy(s->comment, p, sizeof(s->comment));
 414             break;
 415         }
 416         break;
 417     case 'm':
 418         /* new stream */
 419         get_word(st_type, sizeof(st_type), &p);
 420         if (!strcmp(st_type, "audio")) {
 421             codec_type = CODEC_TYPE_AUDIO;
 422         } else if (!strcmp(st_type, "video")) {
 423             codec_type = CODEC_TYPE_VIDEO;
 424         } else {
 425             return;
 426         }
 427         rtsp_st = av_mallocz(sizeof(RTSPStream));
 428         if (!rtsp_st)
 429             return;
 430         rtsp_st->stream_index = -1;
 431         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 432
 433         rtsp_st->sdp_ip = s1->default_ip;
 434         rtsp_st->sdp_ttl = s1->default_ttl;
 435
 436         get_word(buf1, sizeof(buf1), &p); /* port */
 437         rtsp_st->sdp_port = atoi(buf1);
 438
 439         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 440
 441         /* XXX: handle list of formats */
 442         get_word(buf1, sizeof(buf1), &p); /* format list */
 443         rtsp_st->sdp_payload_type = atoi(buf1);
 444
 445         if (!strcmp(AVRtpPayloadTypes[rtsp_st->sdp_payload_type].enc_name, "MP2T")) {
 446             /* no corresponding stream */
 447         } else {
 448             st = av_new_stream(s, 0);
 449             if (!st)
 450                 return;
 451             st->priv_data = rtsp_st;
 452             rtsp_st->stream_index = st->index;
 453             st->codec->codec_type = codec_type;
 454             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 455                 /* if standard payload type, we can find the codec right now */
 456                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 457             }
 458         }
 459         /* put a default control url */
 460         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 461         break;
 462     case 'a':
 463         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 464             char proto[32];
 465             /* get the control url */
 466             st = s->streams[s->nb_streams - 1];
 467             rtsp_st = st->priv_data;
 468
 469             /* XXX: may need to add full url resolution */
 470             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 471             if (proto[0] == '\0') {
 472                 /* relative control URL */
 473                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 474                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 475             } else {
 476                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 477             }
 478         } else if (av_strstart(p, "rtpmap:", &p)) {
 479             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 480             get_word(buf1, sizeof(buf1), &p);
 481             payload_type = atoi(buf1);
 482             for(i = 0; i < s->nb_streams;i++) {
 483                 st = s->streams[i];
 484                 rtsp_st = st->priv_data;
 485                 if (rtsp_st->sdp_payload_type == payload_type) {
 486                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 487                 }
 488             }
 489         } else if (av_strstart(p, "fmtp:", &p)) {
 490             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 491             get_word(buf1, sizeof(buf1), &p);
 492             payload_type = atoi(buf1);
 493             for(i = 0; i < s->nb_streams;i++) {
 494                 st = s->streams[i];
 495                 rtsp_st = st->priv_data;
 496                 if (rtsp_st->sdp_payload_type == payload_type) {
 497                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 498                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 499                             sdp_parse_fmtp(st, p);
 500                         }
 501                     } else {
 502                         sdp_parse_fmtp(st, p);
 503                     }
 504                 }
 505             }
 506         } else if(av_strstart(p, "framesize:", &p)) {
 507             // let dynamic protocol handlers have a stab at the line.
 508             get_word(buf1, sizeof(buf1), &p);
 509             payload_type = atoi(buf1);
 510             for(i = 0; i < s->nb_streams;i++) {
 511                 st = s->streams[i];
 512                 rtsp_st = st->priv_data;
 513                 if (rtsp_st->sdp_payload_type == payload_type) {
 514                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 515                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 516                     }
 517                 }
 518             }
 519         } else if(av_strstart(p, "range:", &p)) {
 520             int64_t start, end;
 521
 522             // this is so that seeking on a streamed file can work.
 523             rtsp_parse_range_npt(p, &start, &end);
 524             s->start_time= start;
 525             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 526         }
 527         break;
 528     }
 529 }
 530
 531 static int sdp_parse(AVFormatContext *s, const char *content)
 532 {
 533     const char *p;
 534     int letter;
 535     char buf[1024], *q;
 536     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 537
 538     memset(s1, 0, sizeof(SDPParseState));
 539     p = content;
 540     for(;;) {
 541         skip_spaces(&p);
 542         letter = *p;
 543         if (letter == '\0')
 544             break;
 545         p++;
 546         if (*p != '=')
 547             goto next_line;
 548         p++;
 549         /* get the content */
 550         q = buf;
 551         while (*p != '\n' && *p != '\r' && *p != '\0') {
 552             if ((q - buf) < sizeof(buf) - 1)
 553                 *q++ = *p;
 554             p++;
 555         }
 556         *q = '\0';
 557         sdp_parse_line(s, s1, letter, buf);
 558     next_line:
 559         while (*p != '\n' && *p != '\0')
 560             p++;
 561         if (*p == '\n')
 562             p++;
 563     }
 564     return 0;
 565 }
 566
 567 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 568 {
 569     const char *p;
 570     int v;
 571
 572     p = *pp;
 573     skip_spaces(&p);
 574     v = strtol(p, (char **)&p, 10);
 575     if (*p == '-') {
 576         p++;
 577         *min_ptr = v;
 578         v = strtol(p, (char **)&p, 10);
 579         *max_ptr = v;
 580     } else {
 581         *min_ptr = v;
 582         *max_ptr = v;
 583     }
 584     *pp = p;
 585 }
 586
 587 /* XXX: only one transport specification is parsed */
 588 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 589 {
 590     char transport_protocol[16];
 591     char profile[16];
 592     char lower_transport[16];
 593     char parameter[16];
 594     RTSPTransportField *th;
 595     char buf[256];
 596
 597     reply->nb_transports = 0;
 598
 599     for(;;) {
 600         skip_spaces(&p);
 601         if (*p == '\0')
 602             break;
 603
 604         th = &reply->transports[reply->nb_transports];
 605
 606         get_word_sep(transport_protocol, sizeof(transport_protocol),
 607                      "/", &p);
 608         if (*p == '/')
 609             p++;
 610         get_word_sep(profile, sizeof(profile), "/;,", &p);
 611         lower_transport[0] = '\0';
 612         if (*p == '/') {
 613             p++;
 614             get_word_sep(lower_transport, sizeof(lower_transport),
 615                          ";,", &p);
 616         }
 617         if (!strcasecmp(lower_transport, "TCP"))
 618             th->protocol = RTSP_PROTOCOL_RTP_TCP;
 619         else
 620             th->protocol = RTSP_PROTOCOL_RTP_UDP;
 621
 622         if (*p == ';')
 623             p++;
 624         /* get each parameter */
 625         while (*p != '\0' && *p != ',') {
 626             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 627             if (!strcmp(parameter, "port")) {
 628                 if (*p == '=') {
 629                     p++;
 630                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 631                 }
 632             } else if (!strcmp(parameter, "client_port")) {
 633                 if (*p == '=') {
 634                     p++;
 635                     rtsp_parse_range(&th->client_port_min,
 636                                      &th->client_port_max, &p);
 637                 }
 638             } else if (!strcmp(parameter, "server_port")) {
 639                 if (*p == '=') {
 640                     p++;
 641                     rtsp_parse_range(&th->server_port_min,
 642                                      &th->server_port_max, &p);
 643                 }
 644             } else if (!strcmp(parameter, "interleaved")) {
 645                 if (*p == '=') {
 646                     p++;
 647                     rtsp_parse_range(&th->interleaved_min,
 648                                      &th->interleaved_max, &p);
 649                 }
 650             } else if (!strcmp(parameter, "multicast")) {
 651                 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
 652                     th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
 653             } else if (!strcmp(parameter, "ttl")) {
 654                 if (*p == '=') {
 655                     p++;
 656                     th->ttl = strtol(p, (char **)&p, 10);
 657                 }
 658             } else if (!strcmp(parameter, "destination")) {
 659                 struct in_addr ipaddr;
 660
 661                 if (*p == '=') {
 662                     p++;
 663                     get_word_sep(buf, sizeof(buf), ";,", &p);
 664                     if (inet_aton(buf, &ipaddr))
 665                         th->destination = ntohl(ipaddr.s_addr);
 666                 }
 667             }
 668             while (*p != ';' && *p != '\0' && *p != ',')
 669                 p++;
 670             if (*p == ';')
 671                 p++;
 672         }
 673         if (*p == ',')
 674             p++;
 675
 676         reply->nb_transports++;
 677     }
 678 }
 679
 680 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 681 {
 682     const char *p;
 683
 684     /* NOTE: we do case independent match for broken servers */
 685     p = buf;
 686     if (av_stristart(p, "Session:", &p)) {
 687         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 688     } else if (av_stristart(p, "Content-Length:", &p)) {
 689         reply->content_length = strtol(p, NULL, 10);
 690     } else if (av_stristart(p, "Transport:", &p)) {
 691         rtsp_parse_transport(reply, p);
 692     } else if (av_stristart(p, "CSeq:", &p)) {
 693         reply->seq = strtol(p, NULL, 10);
 694     } else if (av_stristart(p, "Range:", &p)) {
 695         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 696     }
 697 }
 698
 699 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 700 {
 701     int ret, len;
 702
 703     len = 0;
 704     while (len < size) {
 705         ret = url_read(h, buf+len, size-len);
 706         if (ret < 1)
 707             return ret;
 708         len += ret;
 709     }
 710     return len;
 711 }
 712
 713 /* skip a RTP/TCP interleaved packet */
 714 static void rtsp_skip_packet(AVFormatContext *s)
 715 {
 716     RTSPState *rt = s->priv_data;
 717     int ret, len, len1;
 718     uint8_t buf[1024];
 719
 720     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 721     if (ret != 3)
 722         return;
 723     len = AV_RB16(buf + 1);
 724 #ifdef DEBUG
 725     printf("skipping RTP packet len=%d\n", len);
 726 #endif
 727     /* skip payload */
 728     while (len > 0) {
 729         len1 = len;
 730         if (len1 > sizeof(buf))
 731             len1 = sizeof(buf);
 732         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 733         if (ret != len1)
 734             return;
 735         len -= len1;
 736     }
 737 }
 738
 739 static void rtsp_send_cmd(AVFormatContext *s,
 740                           const char *cmd, RTSPHeader *reply,
 741                           unsigned char **content_ptr)
 742 {
 743     RTSPState *rt = s->priv_data;
 744     char buf[4096], buf1[1024], *q;
 745     unsigned char ch;
 746     const char *p;
 747     int content_length, line_count;
 748     unsigned char *content = NULL;
 749
 750     memset(reply, 0, sizeof(RTSPHeader));
 751
 752     rt->seq++;
 753     av_strlcpy(buf, cmd, sizeof(buf));
 754     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 755     av_strlcat(buf, buf1, sizeof(buf));
 756     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 757         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 758         av_strlcat(buf, buf1, sizeof(buf));
 759     }
 760     av_strlcat(buf, "\r\n", sizeof(buf));
 761 #ifdef DEBUG
 762     printf("Sending:\n%s--\n", buf);
 763 #endif
 764     url_write(rt->rtsp_hd, buf, strlen(buf));
 765
 766     /* parse reply (XXX: use buffers) */
 767     line_count = 0;
 768     rt->last_reply[0] = '\0';
 769     for(;;) {
 770         q = buf;
 771         for(;;) {
 772             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 773                 break;
 774             if (ch == '\n')
 775                 break;
 776             if (ch == '$') {
 777                 /* XXX: only parse it if first char on line ? */
 778                 rtsp_skip_packet(s);
 779             } else if (ch != '\r') {
 780                 if ((q - buf) < sizeof(buf) - 1)
 781                     *q++ = ch;
 782             }
 783         }
 784         *q = '\0';
 785 #ifdef DEBUG
 786         printf("line='%s'\n", buf);
 787 #endif
 788         /* test if last line */
 789         if (buf[0] == '\0')
 790             break;
 791         p = buf;
 792         if (line_count == 0) {
 793             /* get reply code */
 794             get_word(buf1, sizeof(buf1), &p);
 795             get_word(buf1, sizeof(buf1), &p);
 796             reply->status_code = atoi(buf1);
 797         } else {
 798             rtsp_parse_line(reply, p);
 799             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 800             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 801         }
 802         line_count++;
 803     }
 804
 805     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 806         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 807
 808     content_length = reply->content_length;
 809     if (content_length > 0) {
 810         /* leave some room for a trailing '\0' (useful for simple parsing) */
 811         content = av_malloc(content_length + 1);
 812         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 813         content[content_length] = '\0';
 814     }
 815     if (content_ptr)
 816         *content_ptr = content;
 817 }
 818
 819
 820 /* close and free RTSP streams */
 821 static void rtsp_close_streams(RTSPState *rt)
 822 {
 823     int i;
 824     RTSPStream *rtsp_st;
 825
 826     for(i=0;i<rt->nb_rtsp_streams;i++) {
 827         rtsp_st = rt->rtsp_streams[i];
 828         if (rtsp_st) {
 829             if (rtsp_st->rtp_ctx)
 830                 rtp_parse_close(rtsp_st->rtp_ctx);
 831             if (rtsp_st->rtp_handle)
 832                 url_close(rtsp_st->rtp_handle);
 833             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 834                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 835         }
 836         av_free(rtsp_st);
 837     }
 838     av_free(rt->rtsp_streams);
 839 }
 840
 841 static int rtsp_read_header(AVFormatContext *s,
 842                             AVFormatParameters *ap)
 843 {
 844     RTSPState *rt = s->priv_data;
 845     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
 846     URLContext *rtsp_hd;
 847     int port, i, j, ret, err;
 848     RTSPHeader reply1, *reply = &reply1;
 849     unsigned char *content = NULL;
 850     RTSPStream *rtsp_st;
 851     int protocol_mask = 0;
 852     AVStream *st;
 853
 854     /* extract hostname and port */
 855     url_split(NULL, 0, NULL, 0,
 856               host, sizeof(host), &port, path, sizeof(path), s->filename);
 857     if (port < 0)
 858         port = RTSP_DEFAULT_PORT;
 859
 860     /* search for options */
 861     option_list = strchr(path, '?');
 862     if (option_list) {
 863         /* remove the options from the path */
 864         *option_list++ = 0;
 865         while(option_list) {
 866             /* move the option pointer */
 867             option = option_list;
 868             option_list = strchr(option_list, '&');
 869             if (option_list)
 870                 *(option_list++) = 0;
 871             /* handle the options */
 872             if (strcmp(option, "udp") == 0)
 873                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
 874             else if (strcmp(option, "multicast") == 0)
 875                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
 876             else if (strcmp(option, "tcp") == 0)
 877                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
 878         }
 879     }
 880
 881     if (!protocol_mask)
 882         protocol_mask = rtsp_default_protocols;
 883
 884     /* open the tcp connexion */
 885     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
 886     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
 887         return AVERROR_IO;
 888     rt->rtsp_hd = rtsp_hd;
 889     rt->seq = 0;
 890
 891     /* describe the stream */
 892     snprintf(cmd, sizeof(cmd),
 893              "DESCRIBE %s RTSP/1.0\r\n"
 894              "Accept: application/sdp\r\n",
 895              s->filename);
 896     rtsp_send_cmd(s, cmd, reply, &content);
 897     if (!content) {
 898         err = AVERROR_INVALIDDATA;
 899         goto fail;
 900     }
 901     if (reply->status_code != RTSP_STATUS_OK) {
 902         err = AVERROR_INVALIDDATA;
 903         goto fail;
 904     }
 905
 906     /* now we got the SDP description, we parse it */
 907     ret = sdp_parse(s, (const char *)content);
 908     av_freep(&content);
 909     if (ret < 0) {
 910         err = AVERROR_INVALIDDATA;
 911         goto fail;
 912     }
 913
 914     /* for each stream, make the setup request */
 915     /* XXX: we assume the same server is used for the control of each
 916        RTSP stream */
 917
 918     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 919         char transport[2048];
 920
 921         rtsp_st = rt->rtsp_streams[i];
 922
 923         /* compute available transports */
 924         transport[0] = '\0';
 925
 926         /* RTP/UDP */
 927         if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
 928             char buf[256];
 929
 930             /* first try in specified port range */
 931             if (RTSP_RTP_PORT_MIN != 0) {
 932                 while(j <= RTSP_RTP_PORT_MAX) {
 933                     snprintf(buf, sizeof(buf), "rtp://?localport=%d", j);
 934                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 935                         j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 936                         goto rtp_opened;
 937                     }
 938                 }
 939             }
 940
 941 /*            then try on any port
 942 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 943 **                err = AVERROR_INVALIDDATA;
 944 **                goto fail;
 945 **            }
 946 */
 947
 948         rtp_opened:
 949             port = rtp_get_local_port(rtsp_st->rtp_handle);
 950             if (transport[0] != '\0')
 951                 av_strlcat(transport, ",", sizeof(transport));
 952             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 953                      "RTP/AVP/UDP;unicast;client_port=%d-%d",
 954                      port, port + 1);
 955         }
 956
 957         /* RTP/TCP */
 958         else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
 959             if (transport[0] != '\0')
 960                 av_strlcat(transport, ",", sizeof(transport));
 961             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 962                      "RTP/AVP/TCP");
 963         }
 964
 965         else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
 966             if (transport[0] != '\0')
 967                 av_strlcat(transport, ",", sizeof(transport));
 968             snprintf(transport + strlen(transport),
 969                      sizeof(transport) - strlen(transport) - 1,
 970                      "RTP/AVP/UDP;multicast");
 971         }
 972         snprintf(cmd, sizeof(cmd),
 973                  "SETUP %s RTSP/1.0\r\n"
 974                  "Transport: %s\r\n",
 975                  rtsp_st->control_url, transport);
 976         rtsp_send_cmd(s, cmd, reply, NULL);
 977         if (reply->status_code != RTSP_STATUS_OK ||
 978             reply->nb_transports != 1) {
 979             err = AVERROR_INVALIDDATA;
 980             goto fail;
 981         }
 982
 983         /* XXX: same protocol for all streams is required */
 984         if (i > 0) {
 985             if (reply->transports[0].protocol != rt->protocol) {
 986                 err = AVERROR_INVALIDDATA;
 987                 goto fail;
 988             }
 989         } else {
 990             rt->protocol = reply->transports[0].protocol;
 991         }
 992
 993         /* close RTP connection if not choosen */
 994         if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
 995             (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
 996             url_close(rtsp_st->rtp_handle);
 997             rtsp_st->rtp_handle = NULL;
 998         }
 999
1000         switch(reply->transports[0].protocol) {
1001         case RTSP_PROTOCOL_RTP_TCP:
1002             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1003             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1004             break;
1005
1006         case RTSP_PROTOCOL_RTP_UDP:
1007             {
1008                 char url[1024];
1009
1010                 /* XXX: also use address if specified */
1011                 snprintf(url, sizeof(url), "rtp://%s:%d",
1012                          host, reply->transports[0].server_port_min);
1013                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1014                     err = AVERROR_INVALIDDATA;
1015                     goto fail;
1016                 }
1017             }
1018             break;
1019         case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1020             {
1021                 char url[1024];
1022                 struct in_addr in;
1023
1024                 in.s_addr = htonl(reply->transports[0].destination);
1025                 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1026                          inet_ntoa(in),
1027                          reply->transports[0].port_min,
1028                          reply->transports[0].ttl);
1029                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1030                     err = AVERROR_INVALIDDATA;
1031                     goto fail;
1032                 }
1033             }
1034             break;
1035         }
1036         /* open the RTP context */
1037         st = NULL;
1038         if (rtsp_st->stream_index >= 0)
1039             st = s->streams[rtsp_st->stream_index];
1040         if (!st)
1041             s->ctx_flags |= AVFMTCTX_NOHEADER;
1042         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1043
1044         if (!rtsp_st->rtp_ctx) {
1045             err = AVERROR_NOMEM;
1046             goto fail;
1047         } else {
1048             if(rtsp_st->dynamic_handler) {
1049                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1050                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1051             }
1052         }
1053     }
1054
1055     rt->state = RTSP_STATE_IDLE;
1056     rt->seek_timestamp = 0; /* default is to start stream at position
1057                                zero */
1058     if (ap->initial_pause) {
1059         /* do not start immediately */
1060     } else {
1061         if (rtsp_read_play(s) < 0) {
1062             err = AVERROR_INVALIDDATA;
1063             goto fail;
1064         }
1065     }
1066     return 0;
1067  fail:
1068     rtsp_close_streams(rt);
1069     av_freep(&content);
1070     url_close(rt->rtsp_hd);
1071     return err;
1072 }
1073
1074 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1075                            uint8_t *buf, int buf_size)
1076 {
1077     RTSPState *rt = s->priv_data;
1078     int id, len, i, ret;
1079     RTSPStream *rtsp_st;
1080
1081 #ifdef DEBUG_RTP_TCP
1082     printf("tcp_read_packet:\n");
1083 #endif
1084  redo:
1085     for(;;) {
1086         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1087 #ifdef DEBUG_RTP_TCP
1088         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1089 #endif
1090         if (ret != 1)
1091             return -1;
1092         if (buf[0] == '$')
1093             break;
1094     }
1095     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1096     if (ret != 3)
1097         return -1;
1098     id = buf[0];
1099     len = AV_RB16(buf + 1);
1100 #ifdef DEBUG_RTP_TCP
1101     printf("id=%d len=%d\n", id, len);
1102 #endif
1103     if (len > buf_size || len < 12)
1104         goto redo;
1105     /* get the data */
1106     ret = url_readbuf(rt->rtsp_hd, buf, len);
1107     if (ret != len)
1108         return -1;
1109
1110     /* find the matching stream */
1111     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1112         rtsp_st = rt->rtsp_streams[i];
1113         if (id >= rtsp_st->interleaved_min &&
1114             id <= rtsp_st->interleaved_max)
1115             goto found;
1116     }
1117     goto redo;
1118  found:
1119     *prtsp_st = rtsp_st;
1120     return len;
1121 }
1122
1123 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1124                            uint8_t *buf, int buf_size)
1125 {
1126     RTSPState *rt = s->priv_data;
1127     RTSPStream *rtsp_st;
1128     fd_set rfds;
1129     int fd1, fd2, fd_max, n, i, ret;
1130     struct timeval tv;
1131
1132     for(;;) {
1133         if (url_interrupt_cb())
1134             return -1;
1135         FD_ZERO(&rfds);
1136         fd_max = -1;
1137         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1138             rtsp_st = rt->rtsp_streams[i];
1139             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1140             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1141             if (fd1 > fd_max)
1142                 fd_max = fd1;
1143             FD_SET(fd1, &rfds);
1144         }
1145         tv.tv_sec = 0;
1146         tv.tv_usec = 100 * 1000;
1147         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1148         if (n > 0) {
1149             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1150                 rtsp_st = rt->rtsp_streams[i];
1151                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1152                 if (FD_ISSET(fd1, &rfds)) {
1153                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1154                     if (ret > 0) {
1155                         *prtsp_st = rtsp_st;
1156                         return ret;
1157                     }
1158                 }
1159             }
1160         }
1161     }
1162 }
1163
1164 static int rtsp_read_packet(AVFormatContext *s,
1165                             AVPacket *pkt)
1166 {
1167     RTSPState *rt = s->priv_data;
1168     RTSPStream *rtsp_st;
1169     int ret, len;
1170     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1171
1172     /* get next frames from the same RTP packet */
1173     if (rt->cur_rtp) {
1174         ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1175         if (ret == 0) {
1176             rt->cur_rtp = NULL;
1177             return 0;
1178         } else if (ret == 1) {
1179             return 0;
1180         } else {
1181             rt->cur_rtp = NULL;
1182         }
1183     }
1184
1185     /* read next RTP packet */
1186  redo:
1187     switch(rt->protocol) {
1188     default:
1189     case RTSP_PROTOCOL_RTP_TCP:
1190         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1191         break;
1192     case RTSP_PROTOCOL_RTP_UDP:
1193     case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1194         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1195         if (len >=0 && rtsp_st->rtp_ctx)
1196             rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1197         break;
1198     }
1199     if (len < 0)
1200         return AVERROR_IO;
1201     ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1202     if (ret < 0)
1203         goto redo;
1204     if (ret == 1) {
1205         /* more packets may follow, so we save the RTP context */
1206         rt->cur_rtp = rtsp_st->rtp_ctx;
1207     }
1208     return 0;
1209 }
1210
1211 static int rtsp_read_play(AVFormatContext *s)
1212 {
1213     RTSPState *rt = s->priv_data;
1214     RTSPHeader reply1, *reply = &reply1;
1215     char cmd[1024];
1216
1217     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1218
1219     if (rt->state == RTSP_STATE_PAUSED) {
1220         snprintf(cmd, sizeof(cmd),
1221                  "PLAY %s RTSP/1.0\r\n",
1222                  s->filename);
1223     } else {
1224         snprintf(cmd, sizeof(cmd),
1225                  "PLAY %s RTSP/1.0\r\n"
1226                  "Range: npt=%0.3f-\r\n",
1227                  s->filename,
1228                  (double)rt->seek_timestamp / AV_TIME_BASE);
1229     }
1230     rtsp_send_cmd(s, cmd, reply, NULL);
1231     if (reply->status_code != RTSP_STATUS_OK) {
1232         return -1;
1233     } else {
1234         rt->state = RTSP_STATE_PLAYING;
1235         return 0;
1236     }
1237 }
1238
1239 /* pause the stream */
1240 static int rtsp_read_pause(AVFormatContext *s)
1241 {
1242     RTSPState *rt = s->priv_data;
1243     RTSPHeader reply1, *reply = &reply1;
1244     char cmd[1024];
1245
1246     rt = s->priv_data;
1247
1248     if (rt->state != RTSP_STATE_PLAYING)
1249         return 0;
1250
1251     snprintf(cmd, sizeof(cmd),
1252              "PAUSE %s RTSP/1.0\r\n",
1253              s->filename);
1254     rtsp_send_cmd(s, cmd, reply, NULL);
1255     if (reply->status_code != RTSP_STATUS_OK) {
1256         return -1;
1257     } else {
1258         rt->state = RTSP_STATE_PAUSED;
1259         return 0;
1260     }
1261 }
1262
1263 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1264                           int64_t timestamp, int flags)
1265 {
1266     RTSPState *rt = s->priv_data;
1267
1268     rt->seek_timestamp = timestamp;
1269     switch(rt->state) {
1270     default:
1271     case RTSP_STATE_IDLE:
1272         break;
1273     case RTSP_STATE_PLAYING:
1274         if (rtsp_read_play(s) != 0)
1275             return -1;
1276         break;
1277     case RTSP_STATE_PAUSED:
1278         rt->state = RTSP_STATE_IDLE;
1279         break;
1280     }
1281     return 0;
1282 }
1283
1284 static int rtsp_read_close(AVFormatContext *s)
1285 {
1286     RTSPState *rt = s->priv_data;
1287     RTSPHeader reply1, *reply = &reply1;
1288     char cmd[1024];
1289
1290 #if 0
1291     /* NOTE: it is valid to flush the buffer here */
1292     if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1293         url_fclose(&rt->rtsp_gb);
1294     }
1295 #endif
1296     snprintf(cmd, sizeof(cmd),
1297              "TEARDOWN %s RTSP/1.0\r\n",
1298              s->filename);
1299     rtsp_send_cmd(s, cmd, reply, NULL);
1300
1301     rtsp_close_streams(rt);
1302     url_close(rt->rtsp_hd);
1303     return 0;
1304 }
1305
1306 #ifdef CONFIG_RTSP_DEMUXER
1307 AVInputFormat rtsp_demuxer = {
1308     "rtsp",
1309     "RTSP input format",
1310     sizeof(RTSPState),
1311     rtsp_probe,
1312     rtsp_read_header,
1313     rtsp_read_packet,
1314     rtsp_read_close,
1315     rtsp_read_seek,
1316     .flags = AVFMT_NOFILE,
1317     .read_play = rtsp_read_play,
1318     .read_pause = rtsp_read_pause,
1319 };
1320 #endif
1321
1322 static int sdp_probe(AVProbeData *p1)
1323 {
1324     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1325
1326     /* we look for a line beginning "c=IN IP4" */
1327     while (p < p_end && *p != '\0') {
1328         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1329             return AVPROBE_SCORE_MAX / 2;
1330
1331         while(p < p_end - 1 && *p != '\n') p++;
1332         if (++p >= p_end)
1333             break;
1334         if (*p == '\r')
1335             p++;
1336     }
1337     return 0;
1338 }
1339
1340 #define SDP_MAX_SIZE 8192
1341
1342 static int sdp_read_header(AVFormatContext *s,
1343                            AVFormatParameters *ap)
1344 {
1345     RTSPState *rt = s->priv_data;
1346     RTSPStream *rtsp_st;
1347     int size, i, err;
1348     char *content;
1349     char url[1024];
1350     AVStream *st;
1351
1352     /* read the whole sdp file */
1353     /* XXX: better loading */
1354     content = av_malloc(SDP_MAX_SIZE);
1355     size = get_buffer(&s->pb, content, SDP_MAX_SIZE - 1);
1356     if (size <= 0) {
1357         av_free(content);
1358         return AVERROR_INVALIDDATA;
1359     }
1360     content[size] ='\0';
1361
1362     sdp_parse(s, content);
1363     av_free(content);
1364
1365     /* open each RTP stream */
1366     for(i=0;i<rt->nb_rtsp_streams;i++) {
1367         rtsp_st = rt->rtsp_streams[i];
1368
1369         snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1370                  inet_ntoa(rtsp_st->sdp_ip),
1371                  rtsp_st->sdp_port,
1372                  rtsp_st->sdp_ttl);
1373         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1374             err = AVERROR_INVALIDDATA;
1375             goto fail;
1376         }
1377         /* open the RTP context */
1378         st = NULL;
1379         if (rtsp_st->stream_index >= 0)
1380             st = s->streams[rtsp_st->stream_index];
1381         if (!st)
1382             s->ctx_flags |= AVFMTCTX_NOHEADER;
1383         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1384         if (!rtsp_st->rtp_ctx) {
1385             err = AVERROR_NOMEM;
1386             goto fail;
1387         } else {
1388             if(rtsp_st->dynamic_handler) {
1389                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1390                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1391             }
1392         }
1393     }
1394     return 0;
1395  fail:
1396     rtsp_close_streams(rt);
1397     return err;
1398 }
1399
1400 static int sdp_read_packet(AVFormatContext *s,
1401                             AVPacket *pkt)
1402 {
1403     return rtsp_read_packet(s, pkt);
1404 }
1405
1406 static int sdp_read_close(AVFormatContext *s)
1407 {
1408     RTSPState *rt = s->priv_data;
1409     rtsp_close_streams(rt);
1410     return 0;
1411 }
1412
1413 #ifdef CONFIG_SDP_DEMUXER
1414 AVInputFormat sdp_demuxer = {
1415     "sdp",
1416     "SDP",
1417     sizeof(RTSPState),
1418     sdp_probe,
1419     sdp_read_header,
1420     sdp_read_packet,
1421     sdp_read_close,
1422 };
1423 #endif
1424
1425 #ifdef CONFIG_REDIR_DEMUXER
1426 /* dummy redirector format (used directly in av_open_input_file now) */
1427 static int redir_probe(AVProbeData *pd)
1428 {
1429     const char *p;
1430     p = pd->buf;
1431     while (redir_isspace(*p))
1432         p++;
1433     if (av_strstart(p, "http://", NULL) ||
1434         av_strstart(p, "rtsp://", NULL))
1435         return AVPROBE_SCORE_MAX;
1436     return 0;
1437 }
1438
1439 /* called from utils.c */
1440 int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f)
1441 {
1442     char buf[4096], *q;
1443     int c;
1444     AVFormatContext *ic = NULL;
1445
1446     /* parse each URL and try to open it */
1447     c = url_fgetc(f);
1448     while (c != URL_EOF) {
1449         /* skip spaces */
1450         for(;;) {
1451             if (!redir_isspace(c))
1452                 break;
1453             c = url_fgetc(f);
1454         }
1455         if (c == URL_EOF)
1456             break;
1457         /* record url */
1458         q = buf;
1459         for(;;) {
1460             if (c == URL_EOF || redir_isspace(c))
1461                 break;
1462             if ((q - buf) < sizeof(buf) - 1)
1463                 *q++ = c;
1464             c = url_fgetc(f);
1465         }
1466         *q = '\0';
1467         //printf("URL='%s'\n", buf);
1468         /* try to open the media file */
1469         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1470             break;
1471     }
1472     *ic_ptr = ic;
1473     if (!ic)
1474         return AVERROR_IO;
1475     else
1476         return 0;
1477 }
1478
1479 AVInputFormat redir_demuxer = {
1480     "redir",
1481     "Redirector format",
1482     0,
1483     redir_probe,
1484     NULL,
1485     NULL,
1486     NULL,
1487 };
1488 #endif