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
  22 /* needed by inet_aton() */
  23 #define _SVID_SOURCE
  24
  25 #include "libavutil/avstring.h"
  26 #include "avformat.h"
  27
  28 #include <sys/time.h>
  29 #ifdef HAVE_SYS_SELECT_H
  30 #include <sys/select.h>
  31 #endif
  32 #include <strings.h>
  33 #include "network.h"
  34 #include "rtsp.h"
  35
  36 #include "rtp_internal.h"
  37 #include "rdt.h"
  38
  39 //#define DEBUG
  40 //#define DEBUG_RTP_TCP
  41
  42 static int rtsp_read_play(AVFormatContext *s);
  43
  44 /* XXX: currently, the only way to change the protocols consists in
  45    changing this variable */
  46
  47 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  48 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
  49 #endif
  50
  51 static int rtsp_probe(AVProbeData *p)
  52 {
  53     if (av_strstart(p->filename, "rtsp:", NULL))
  54         return AVPROBE_SCORE_MAX;
  55     return 0;
  56 }
  57
  58 static int redir_isspace(int c)
  59 {
  60     return c == ' ' || c == '\t' || c == '\n' || c == '\r';
  61 }
  62
  63 static void skip_spaces(const char **pp)
  64 {
  65     const char *p;
  66     p = *pp;
  67     while (redir_isspace(*p))
  68         p++;
  69     *pp = p;
  70 }
  71
  72 static void get_word_sep(char *buf, int buf_size, const char *sep,
  73                          const char **pp)
  74 {
  75     const char *p;
  76     char *q;
  77
  78     p = *pp;
  79     if (*p == '/')
  80         p++;
  81     skip_spaces(&p);
  82     q = buf;
  83     while (!strchr(sep, *p) && *p != '\0') {
  84         if ((q - buf) < buf_size - 1)
  85             *q++ = *p;
  86         p++;
  87     }
  88     if (buf_size > 0)
  89         *q = '\0';
  90     *pp = p;
  91 }
  92
  93 static void get_word(char *buf, int buf_size, const char **pp)
  94 {
  95     const char *p;
  96     char *q;
  97
  98     p = *pp;
  99     skip_spaces(&p);
 100     q = buf;
 101     while (!redir_isspace(*p) && *p != '\0') {
 102         if ((q - buf) < buf_size - 1)
 103             *q++ = *p;
 104         p++;
 105     }
 106     if (buf_size > 0)
 107         *q = '\0';
 108     *pp = p;
 109 }
 110
 111 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 112    params>] */
 113 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 114 {
 115     char buf[256];
 116     int i;
 117     AVCodec *c;
 118     const char *c_name;
 119
 120     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 121        see if we can handle this kind of payload */
 122     get_word_sep(buf, sizeof(buf), "/", &p);
 123     if (payload_type >= RTP_PT_PRIVATE) {
 124         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 125         while(handler) {
 126             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 127                 codec->codec_id = handler->codec_id;
 128                 rtsp_st->dynamic_handler= handler;
 129                 if(handler->open) {
 130                     rtsp_st->dynamic_protocol_context= handler->open();
 131                 }
 132                 break;
 133             }
 134             handler= handler->next;
 135         }
 136     } else {
 137         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 138         /* search into AVRtpPayloadTypes[] */
 139         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 140     }
 141
 142     c = avcodec_find_decoder(codec->codec_id);
 143     if (c && c->name)
 144         c_name = c->name;
 145     else
 146         c_name = (char *)NULL;
 147
 148     if (c_name) {
 149         get_word_sep(buf, sizeof(buf), "/", &p);
 150         i = atoi(buf);
 151         switch (codec->codec_type) {
 152             case CODEC_TYPE_AUDIO:
 153                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 154                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 155                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 156                 if (i > 0) {
 157                     codec->sample_rate = i;
 158                     get_word_sep(buf, sizeof(buf), "/", &p);
 159                     i = atoi(buf);
 160                     if (i > 0)
 161                         codec->channels = i;
 162                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 163                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 164                 }
 165                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 166                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 167                 break;
 168             case CODEC_TYPE_VIDEO:
 169                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 170                 break;
 171             default:
 172                 break;
 173         }
 174         return 0;
 175     }
 176
 177     return -1;
 178 }
 179
 180 /* return the length and optionnaly the data */
 181 static int hex_to_data(uint8_t *data, const char *p)
 182 {
 183     int c, len, v;
 184
 185     len = 0;
 186     v = 1;
 187     for(;;) {
 188         skip_spaces(&p);
 189         if (p == '\0')
 190             break;
 191         c = toupper((unsigned char)*p++);
 192         if (c >= '0' && c <= '9')
 193             c = c - '0';
 194         else if (c >= 'A' && c <= 'F')
 195             c = c - 'A' + 10;
 196         else
 197             break;
 198         v = (v << 4) | c;
 199         if (v & 0x100) {
 200             if (data)
 201                 data[len] = v;
 202             len++;
 203             v = 1;
 204         }
 205     }
 206     return len;
 207 }
 208
 209 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 210 {
 211     switch (codec->codec_id) {
 212         case CODEC_ID_MPEG4:
 213         case CODEC_ID_AAC:
 214             if (!strcmp(attr, "config")) {
 215                 /* decode the hexa encoded parameter */
 216                 int len = hex_to_data(NULL, value);
 217                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 218                 if (!codec->extradata)
 219                     return;
 220                 codec->extradata_size = len;
 221                 hex_to_data(codec->extradata, value);
 222             }
 223             break;
 224         default:
 225             break;
 226     }
 227     return;
 228 }
 229
 230 typedef struct {
 231     const char *str;
 232     uint16_t type;
 233     uint32_t offset;
 234 } AttrNameMap;
 235
 236 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 237 #define ATTR_NAME_TYPE_INT 0
 238 #define ATTR_NAME_TYPE_STR 1
 239 static const AttrNameMap attr_names[]=
 240 {
 241     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, sizelength)},
 242     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexlength)},
 243     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexdeltalength)},
 244     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, profile_level_id)},
 245     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, streamtype)},
 246     {"mode",             ATTR_NAME_TYPE_STR, offsetof(RTPPayloadData, mode)},
 247     {NULL, -1, -1},
 248 };
 249
 250 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 251 * because it is used in rtp_h264.c, which is forthcoming.
 252 */
 253 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 254 {
 255     skip_spaces(p);
 256     if(**p)
 257     {
 258         get_word_sep(attr, attr_size, "=", p);
 259         if (**p == '=')
 260             (*p)++;
 261         get_word_sep(value, value_size, ";", p);
 262         if (**p == ';')
 263             (*p)++;
 264         return 1;
 265     }
 266     return 0;
 267 }
 268
 269 /* parse a SDP line and save stream attributes */
 270 static void sdp_parse_fmtp(AVStream *st, const char *p)
 271 {
 272     char attr[256];
 273     char value[4096];
 274     int i;
 275
 276     RTSPStream *rtsp_st = st->priv_data;
 277     AVCodecContext *codec = st->codec;
 278     RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
 279
 280     /* loop on each attribute */
 281     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 282     {
 283         /* grab the codec extra_data from the config parameter of the fmtp line */
 284         sdp_parse_fmtp_config(codec, attr, value);
 285         /* Looking for a known attribute */
 286         for (i = 0; attr_names[i].str; ++i) {
 287             if (!strcasecmp(attr, attr_names[i].str)) {
 288                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 289                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 290                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 291                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 292             }
 293         }
 294     }
 295 }
 296
 297 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 298  *  and end time.
 299  *  Used for seeking in the rtp stream.
 300  */
 301 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 302 {
 303     char buf[256];
 304
 305     skip_spaces(&p);
 306     if (!av_stristart(p, "npt=", &p))
 307         return;
 308
 309     *start = AV_NOPTS_VALUE;
 310     *end = AV_NOPTS_VALUE;
 311
 312     get_word_sep(buf, sizeof(buf), "-", &p);
 313     *start = parse_date(buf, 1);
 314     if (*p == '-') {
 315         p++;
 316         get_word_sep(buf, sizeof(buf), "-", &p);
 317         *end = parse_date(buf, 1);
 318     }
 319 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 320 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 321 }
 322
 323 typedef struct SDPParseState {
 324     /* SDP only */
 325     struct in_addr default_ip;
 326     int default_ttl;
 327 } SDPParseState;
 328
 329 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 330                            int letter, const char *buf)
 331 {
 332     RTSPState *rt = s->priv_data;
 333     char buf1[64], st_type[64];
 334     const char *p;
 335     enum CodecType codec_type;
 336     int payload_type, i;
 337     AVStream *st;
 338     RTSPStream *rtsp_st;
 339     struct in_addr sdp_ip;
 340     int ttl;
 341
 342 #ifdef DEBUG
 343     printf("sdp: %c='%s'\n", letter, buf);
 344 #endif
 345
 346     p = buf;
 347     switch(letter) {
 348     case 'c':
 349         get_word(buf1, sizeof(buf1), &p);
 350         if (strcmp(buf1, "IN") != 0)
 351             return;
 352         get_word(buf1, sizeof(buf1), &p);
 353         if (strcmp(buf1, "IP4") != 0)
 354             return;
 355         get_word_sep(buf1, sizeof(buf1), "/", &p);
 356         if (inet_aton(buf1, &sdp_ip) == 0)
 357             return;
 358         ttl = 16;
 359         if (*p == '/') {
 360             p++;
 361             get_word_sep(buf1, sizeof(buf1), "/", &p);
 362             ttl = atoi(buf1);
 363         }
 364         if (s->nb_streams == 0) {
 365             s1->default_ip = sdp_ip;
 366             s1->default_ttl = ttl;
 367         } else {
 368             st = s->streams[s->nb_streams - 1];
 369             rtsp_st = st->priv_data;
 370             rtsp_st->sdp_ip = sdp_ip;
 371             rtsp_st->sdp_ttl = ttl;
 372         }
 373         break;
 374     case 's':
 375         av_strlcpy(s->title, p, sizeof(s->title));
 376         break;
 377     case 'i':
 378         if (s->nb_streams == 0) {
 379             av_strlcpy(s->comment, p, sizeof(s->comment));
 380             break;
 381         }
 382         break;
 383     case 'm':
 384         /* new stream */
 385         get_word(st_type, sizeof(st_type), &p);
 386         if (!strcmp(st_type, "audio")) {
 387             codec_type = CODEC_TYPE_AUDIO;
 388         } else if (!strcmp(st_type, "video")) {
 389             codec_type = CODEC_TYPE_VIDEO;
 390         } else {
 391             return;
 392         }
 393         rtsp_st = av_mallocz(sizeof(RTSPStream));
 394         if (!rtsp_st)
 395             return;
 396         rtsp_st->stream_index = -1;
 397         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 398
 399         rtsp_st->sdp_ip = s1->default_ip;
 400         rtsp_st->sdp_ttl = s1->default_ttl;
 401
 402         get_word(buf1, sizeof(buf1), &p); /* port */
 403         rtsp_st->sdp_port = atoi(buf1);
 404
 405         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 406
 407         /* XXX: handle list of formats */
 408         get_word(buf1, sizeof(buf1), &p); /* format list */
 409         rtsp_st->sdp_payload_type = atoi(buf1);
 410
 411         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 412             /* no corresponding stream */
 413         } else {
 414             st = av_new_stream(s, 0);
 415             if (!st)
 416                 return;
 417             st->priv_data = rtsp_st;
 418             rtsp_st->stream_index = st->index;
 419             st->codec->codec_type = codec_type;
 420             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 421                 /* if standard payload type, we can find the codec right now */
 422                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 423             }
 424         }
 425         /* put a default control url */
 426         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 427         break;
 428     case 'a':
 429         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 430             char proto[32];
 431             /* get the control url */
 432             st = s->streams[s->nb_streams - 1];
 433             rtsp_st = st->priv_data;
 434
 435             /* XXX: may need to add full url resolution */
 436             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 437             if (proto[0] == '\0') {
 438                 /* relative control URL */
 439                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 440                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 441             } else {
 442                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 443             }
 444         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 445             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 446             get_word(buf1, sizeof(buf1), &p);
 447             payload_type = atoi(buf1);
 448             st = s->streams[s->nb_streams - 1];
 449             rtsp_st = st->priv_data;
 450             sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 451         } else if (av_strstart(p, "fmtp:", &p)) {
 452             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 453             get_word(buf1, sizeof(buf1), &p);
 454             payload_type = atoi(buf1);
 455             for(i = 0; i < s->nb_streams;i++) {
 456                 st = s->streams[i];
 457                 rtsp_st = st->priv_data;
 458                 if (rtsp_st->sdp_payload_type == payload_type) {
 459                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 460                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
 461                             sdp_parse_fmtp(st, p);
 462                         }
 463                     } else {
 464                         sdp_parse_fmtp(st, p);
 465                     }
 466                 }
 467             }
 468         } else if(av_strstart(p, "framesize:", &p)) {
 469             // let dynamic protocol handlers have a stab at the line.
 470             get_word(buf1, sizeof(buf1), &p);
 471             payload_type = atoi(buf1);
 472             for(i = 0; i < s->nb_streams;i++) {
 473                 st = s->streams[i];
 474                 rtsp_st = st->priv_data;
 475                 if (rtsp_st->sdp_payload_type == payload_type) {
 476                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 477                         rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
 478                     }
 479                 }
 480             }
 481         } else if(av_strstart(p, "range:", &p)) {
 482             int64_t start, end;
 483
 484             // this is so that seeking on a streamed file can work.
 485             rtsp_parse_range_npt(p, &start, &end);
 486             s->start_time= start;
 487             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 488         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 489             if (atoi(p) == 1)
 490                 rt->transport = RTSP_TRANSPORT_RDT;
 491         } else if (s->nb_streams > 0) {
 492             if (rt->server_type == RTSP_SERVER_REAL)
 493                 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 494
 495             rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 496             if (rtsp_st->dynamic_handler &&
 497                 rtsp_st->dynamic_handler->parse_sdp_a_line)
 498                 rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
 499                     rtsp_st->dynamic_protocol_context, buf);
 500         }
 501         break;
 502     }
 503 }
 504
 505 static int sdp_parse(AVFormatContext *s, const char *content)
 506 {
 507     const char *p;
 508     int letter;
 509     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 510      * contain long SDP lines containing complete ASF Headers (several
 511      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 512      * "rulebooks" describing their properties. Therefore, the SDP line
 513      * buffer is large. */
 514     char buf[8192], *q;
 515     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 516
 517     memset(s1, 0, sizeof(SDPParseState));
 518     p = content;
 519     for(;;) {
 520         skip_spaces(&p);
 521         letter = *p;
 522         if (letter == '\0')
 523             break;
 524         p++;
 525         if (*p != '=')
 526             goto next_line;
 527         p++;
 528         /* get the content */
 529         q = buf;
 530         while (*p != '\n' && *p != '\r' && *p != '\0') {
 531             if ((q - buf) < sizeof(buf) - 1)
 532                 *q++ = *p;
 533             p++;
 534         }
 535         *q = '\0';
 536         sdp_parse_line(s, s1, letter, buf);
 537     next_line:
 538         while (*p != '\n' && *p != '\0')
 539             p++;
 540         if (*p == '\n')
 541             p++;
 542     }
 543     return 0;
 544 }
 545
 546 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 547 {
 548     const char *p;
 549     int v;
 550
 551     p = *pp;
 552     skip_spaces(&p);
 553     v = strtol(p, (char **)&p, 10);
 554     if (*p == '-') {
 555         p++;
 556         *min_ptr = v;
 557         v = strtol(p, (char **)&p, 10);
 558         *max_ptr = v;
 559     } else {
 560         *min_ptr = v;
 561         *max_ptr = v;
 562     }
 563     *pp = p;
 564 }
 565
 566 /* XXX: only one transport specification is parsed */
 567 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 568 {
 569     char transport_protocol[16];
 570     char profile[16];
 571     char lower_transport[16];
 572     char parameter[16];
 573     RTSPTransportField *th;
 574     char buf[256];
 575
 576     reply->nb_transports = 0;
 577
 578     for(;;) {
 579         skip_spaces(&p);
 580         if (*p == '\0')
 581             break;
 582
 583         th = &reply->transports[reply->nb_transports];
 584
 585         get_word_sep(transport_protocol, sizeof(transport_protocol),
 586                      "/", &p);
 587         if (*p == '/')
 588             p++;
 589         if (!strcasecmp (transport_protocol, "rtp")) {
 590             get_word_sep(profile, sizeof(profile), "/;,", &p);
 591             lower_transport[0] = '\0';
 592             /* rtp/avp/<protocol> */
 593             if (*p == '/') {
 594                 p++;
 595                 get_word_sep(lower_transport, sizeof(lower_transport),
 596                              ";,", &p);
 597             }
 598             th->transport = RTSP_TRANSPORT_RTP;
 599         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 600                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 601             /* x-pn-tng/<protocol> */
 602             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 603             profile[0] = '\0';
 604             th->transport = RTSP_TRANSPORT_RDT;
 605         }
 606         if (!strcasecmp(lower_transport, "TCP"))
 607             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 608         else
 609             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 610
 611         if (*p == ';')
 612             p++;
 613         /* get each parameter */
 614         while (*p != '\0' && *p != ',') {
 615             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 616             if (!strcmp(parameter, "port")) {
 617                 if (*p == '=') {
 618                     p++;
 619                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 620                 }
 621             } else if (!strcmp(parameter, "client_port")) {
 622                 if (*p == '=') {
 623                     p++;
 624                     rtsp_parse_range(&th->client_port_min,
 625                                      &th->client_port_max, &p);
 626                 }
 627             } else if (!strcmp(parameter, "server_port")) {
 628                 if (*p == '=') {
 629                     p++;
 630                     rtsp_parse_range(&th->server_port_min,
 631                                      &th->server_port_max, &p);
 632                 }
 633             } else if (!strcmp(parameter, "interleaved")) {
 634                 if (*p == '=') {
 635                     p++;
 636                     rtsp_parse_range(&th->interleaved_min,
 637                                      &th->interleaved_max, &p);
 638                 }
 639             } else if (!strcmp(parameter, "multicast")) {
 640                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 641                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 642             } else if (!strcmp(parameter, "ttl")) {
 643                 if (*p == '=') {
 644                     p++;
 645                     th->ttl = strtol(p, (char **)&p, 10);
 646                 }
 647             } else if (!strcmp(parameter, "destination")) {
 648                 struct in_addr ipaddr;
 649
 650                 if (*p == '=') {
 651                     p++;
 652                     get_word_sep(buf, sizeof(buf), ";,", &p);
 653                     if (inet_aton(buf, &ipaddr))
 654                         th->destination = ntohl(ipaddr.s_addr);
 655                 }
 656             }
 657             while (*p != ';' && *p != '\0' && *p != ',')
 658                 p++;
 659             if (*p == ';')
 660                 p++;
 661         }
 662         if (*p == ',')
 663             p++;
 664
 665         reply->nb_transports++;
 666     }
 667 }
 668
 669 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 670 {
 671     const char *p;
 672
 673     /* NOTE: we do case independent match for broken servers */
 674     p = buf;
 675     if (av_stristart(p, "Session:", &p)) {
 676         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 677     } else if (av_stristart(p, "Content-Length:", &p)) {
 678         reply->content_length = strtol(p, NULL, 10);
 679     } else if (av_stristart(p, "Transport:", &p)) {
 680         rtsp_parse_transport(reply, p);
 681     } else if (av_stristart(p, "CSeq:", &p)) {
 682         reply->seq = strtol(p, NULL, 10);
 683     } else if (av_stristart(p, "Range:", &p)) {
 684         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 685     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 686         skip_spaces(&p);
 687         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 688     } else if (av_stristart(p, "Server:", &p)) {
 689         skip_spaces(&p);
 690         av_strlcpy(reply->server, p, sizeof(reply->server));
 691     }
 692 }
 693
 694 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 695 {
 696     int ret, len;
 697
 698     len = 0;
 699     while (len < size) {
 700         ret = url_read(h, buf+len, size-len);
 701         if (ret < 1)
 702             return ret;
 703         len += ret;
 704     }
 705     return len;
 706 }
 707
 708 /* skip a RTP/TCP interleaved packet */
 709 static void rtsp_skip_packet(AVFormatContext *s)
 710 {
 711     RTSPState *rt = s->priv_data;
 712     int ret, len, len1;
 713     uint8_t buf[1024];
 714
 715     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 716     if (ret != 3)
 717         return;
 718     len = AV_RB16(buf + 1);
 719 #ifdef DEBUG
 720     printf("skipping RTP packet len=%d\n", len);
 721 #endif
 722     /* skip payload */
 723     while (len > 0) {
 724         len1 = len;
 725         if (len1 > sizeof(buf))
 726             len1 = sizeof(buf);
 727         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 728         if (ret != len1)
 729             return;
 730         len -= len1;
 731     }
 732 }
 733
 734 static void rtsp_send_cmd(AVFormatContext *s,
 735                           const char *cmd, RTSPHeader *reply,
 736                           unsigned char **content_ptr)
 737 {
 738     RTSPState *rt = s->priv_data;
 739     char buf[4096], buf1[1024], *q;
 740     unsigned char ch;
 741     const char *p;
 742     int content_length, line_count;
 743     unsigned char *content = NULL;
 744
 745     memset(reply, 0, sizeof(RTSPHeader));
 746
 747     rt->seq++;
 748     av_strlcpy(buf, cmd, sizeof(buf));
 749     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 750     av_strlcat(buf, buf1, sizeof(buf));
 751     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 752         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 753         av_strlcat(buf, buf1, sizeof(buf));
 754     }
 755     av_strlcat(buf, "\r\n", sizeof(buf));
 756 #ifdef DEBUG
 757     printf("Sending:\n%s--\n", buf);
 758 #endif
 759     url_write(rt->rtsp_hd, buf, strlen(buf));
 760
 761     /* parse reply (XXX: use buffers) */
 762     line_count = 0;
 763     rt->last_reply[0] = '\0';
 764     for(;;) {
 765         q = buf;
 766         for(;;) {
 767             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 768                 break;
 769             if (ch == '\n')
 770                 break;
 771             if (ch == '$') {
 772                 /* XXX: only parse it if first char on line ? */
 773                 rtsp_skip_packet(s);
 774             } else if (ch != '\r') {
 775                 if ((q - buf) < sizeof(buf) - 1)
 776                     *q++ = ch;
 777             }
 778         }
 779         *q = '\0';
 780 #ifdef DEBUG
 781         printf("line='%s'\n", buf);
 782 #endif
 783         /* test if last line */
 784         if (buf[0] == '\0')
 785             break;
 786         p = buf;
 787         if (line_count == 0) {
 788             /* get reply code */
 789             get_word(buf1, sizeof(buf1), &p);
 790             get_word(buf1, sizeof(buf1), &p);
 791             reply->status_code = atoi(buf1);
 792         } else {
 793             rtsp_parse_line(reply, p);
 794             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 795             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 796         }
 797         line_count++;
 798     }
 799
 800     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 801         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 802
 803     content_length = reply->content_length;
 804     if (content_length > 0) {
 805         /* leave some room for a trailing '\0' (useful for simple parsing) */
 806         content = av_malloc(content_length + 1);
 807         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 808         content[content_length] = '\0';
 809     }
 810     if (content_ptr)
 811         *content_ptr = content;
 812     else
 813         av_free(content);
 814 }
 815
 816
 817 /* close and free RTSP streams */
 818 static void rtsp_close_streams(RTSPState *rt)
 819 {
 820     int i;
 821     RTSPStream *rtsp_st;
 822
 823     for(i=0;i<rt->nb_rtsp_streams;i++) {
 824         rtsp_st = rt->rtsp_streams[i];
 825         if (rtsp_st) {
 826             if (rtsp_st->tx_ctx) {
 827                 if (rt->transport == RTSP_TRANSPORT_RDT)
 828                     ff_rdt_parse_close(rtsp_st->tx_ctx);
 829                 else
 830                     rtp_parse_close(rtsp_st->tx_ctx);
 831             }
 832             if (rtsp_st->rtp_handle)
 833                 url_close(rtsp_st->rtp_handle);
 834             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 835                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 836         }
 837     }
 838     av_free(rt->rtsp_streams);
 839 }
 840
 841 static int
 842 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 843 {
 844     RTSPState *rt = s->priv_data;
 845     AVStream *st = NULL;
 846
 847     /* open the RTP context */
 848     if (rtsp_st->stream_index >= 0)
 849         st = s->streams[rtsp_st->stream_index];
 850     if (!st)
 851         s->ctx_flags |= AVFMTCTX_NOHEADER;
 852
 853     if (rt->transport == RTSP_TRANSPORT_RDT)
 854         rtsp_st->tx_ctx = ff_rdt_parse_open(s, st->index,
 855                                             rtsp_st->dynamic_protocol_context,
 856                                             rtsp_st->dynamic_handler);
 857     else
 858         rtsp_st->tx_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 859                                          rtsp_st->sdp_payload_type,
 860                                          &rtsp_st->rtp_payload_data);
 861
 862     if (!rtsp_st->tx_ctx) {
 863          return AVERROR(ENOMEM);
 864     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 865         if(rtsp_st->dynamic_handler) {
 866             rtp_parse_set_dynamic_protocol(rtsp_st->tx_ctx,
 867                                            rtsp_st->dynamic_protocol_context,
 868                                            rtsp_st->dynamic_handler);
 869         }
 870     }
 871
 872     return 0;
 873 }
 874
 875 /**
 876  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 877  */
 878 static int
 879 make_setup_request (AVFormatContext *s, const char *host, int port,
 880                     int lower_transport, const char *real_challenge)
 881 {
 882     RTSPState *rt = s->priv_data;
 883     int j, i, err;
 884     RTSPStream *rtsp_st;
 885     RTSPHeader reply1, *reply = &reply1;
 886     char cmd[2048];
 887     const char *trans_pref;
 888
 889     if (rt->transport == RTSP_TRANSPORT_RDT)
 890         trans_pref = "x-pn-tng";
 891     else
 892         trans_pref = "RTP/AVP";
 893
 894     /* for each stream, make the setup request */
 895     /* XXX: we assume the same server is used for the control of each
 896        RTSP stream */
 897
 898     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 899         char transport[2048];
 900
 901         rtsp_st = rt->rtsp_streams[i];
 902
 903         /* RTP/UDP */
 904         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 905             char buf[256];
 906
 907             /* first try in specified port range */
 908             if (RTSP_RTP_PORT_MIN != 0) {
 909                 while(j <= RTSP_RTP_PORT_MAX) {
 910                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 911                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 912                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 913                         goto rtp_opened;
 914                     }
 915                 }
 916             }
 917
 918 /*            then try on any port
 919 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 920 **                err = AVERROR_INVALIDDATA;
 921 **                goto fail;
 922 **            }
 923 */
 924
 925         rtp_opened:
 926             port = rtp_get_local_port(rtsp_st->rtp_handle);
 927             snprintf(transport, sizeof(transport) - 1,
 928                      "%s/UDP;", trans_pref);
 929             if (rt->server_type != RTSP_SERVER_REAL)
 930                 av_strlcat(transport, "unicast;", sizeof(transport));
 931             av_strlcatf(transport, sizeof(transport),
 932                      "client_port=%d", port);
 933             if (rt->transport == RTSP_TRANSPORT_RTP)
 934                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
 935         }
 936
 937         /* RTP/TCP */
 938         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 939             snprintf(transport, sizeof(transport) - 1,
 940                      "%s/TCP", trans_pref);
 941         }
 942
 943         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
 944             snprintf(transport, sizeof(transport) - 1,
 945                      "%s/UDP;multicast", trans_pref);
 946         }
 947         if (rt->server_type == RTSP_SERVER_REAL)
 948             av_strlcat(transport, ";mode=play", sizeof(transport));
 949         snprintf(cmd, sizeof(cmd),
 950                  "SETUP %s RTSP/1.0\r\n"
 951                  "Transport: %s\r\n",
 952                  rtsp_st->control_url, transport);
 953         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
 954             char real_res[41], real_csum[9];
 955             ff_rdt_calc_response_and_checksum(real_res, real_csum,
 956                                               real_challenge);
 957             av_strlcatf(cmd, sizeof(cmd),
 958                         "If-Match: %s\r\n"
 959                         "RealChallenge2: %s, sd=%s\r\n",
 960                         rt->session_id, real_res, real_csum);
 961         }
 962         rtsp_send_cmd(s, cmd, reply, NULL);
 963         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
 964             err = 1;
 965             goto fail;
 966         } else if (reply->status_code != RTSP_STATUS_OK ||
 967                    reply->nb_transports != 1) {
 968             err = AVERROR_INVALIDDATA;
 969             goto fail;
 970         }
 971
 972         /* XXX: same protocol for all streams is required */
 973         if (i > 0) {
 974             if (reply->transports[0].lower_transport != rt->lower_transport ||
 975                 reply->transports[0].transport != rt->transport) {
 976                 err = AVERROR_INVALIDDATA;
 977                 goto fail;
 978             }
 979         } else {
 980             rt->lower_transport = reply->transports[0].lower_transport;
 981             rt->transport = reply->transports[0].transport;
 982         }
 983
 984         /* close RTP connection if not choosen */
 985         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
 986             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
 987             url_close(rtsp_st->rtp_handle);
 988             rtsp_st->rtp_handle = NULL;
 989         }
 990
 991         switch(reply->transports[0].lower_transport) {
 992         case RTSP_LOWER_TRANSPORT_TCP:
 993             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
 994             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
 995             break;
 996
 997         case RTSP_LOWER_TRANSPORT_UDP:
 998             {
 999                 char url[1024];
1000
1001                 /* XXX: also use address if specified */
1002                 snprintf(url, sizeof(url), "rtp://%s:%d",
1003                          host, reply->transports[0].server_port_min);
1004                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1005                     err = AVERROR_INVALIDDATA;
1006                     goto fail;
1007                 }
1008             }
1009             break;
1010         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1011             {
1012                 char url[1024];
1013                 struct in_addr in;
1014
1015                 in.s_addr = htonl(reply->transports[0].destination);
1016                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1017                          inet_ntoa(in),
1018                          reply->transports[0].port_min,
1019                          reply->transports[0].ttl);
1020                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1021                     err = AVERROR_INVALIDDATA;
1022                     goto fail;
1023                 }
1024             }
1025             break;
1026         }
1027
1028         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1029             goto fail;
1030     }
1031
1032     if (rt->server_type == RTSP_SERVER_REAL)
1033         rt->need_subscription = 1;
1034
1035     return 0;
1036
1037 fail:
1038     for (i=0; i<rt->nb_rtsp_streams; i++) {
1039         if (rt->rtsp_streams[i]->rtp_handle) {
1040             url_close(rt->rtsp_streams[i]->rtp_handle);
1041             rt->rtsp_streams[i]->rtp_handle = NULL;
1042         }
1043     }
1044     return err;
1045 }
1046
1047 static int rtsp_read_header(AVFormatContext *s,
1048                             AVFormatParameters *ap)
1049 {
1050     RTSPState *rt = s->priv_data;
1051     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1052     URLContext *rtsp_hd;
1053     int port, ret, err;
1054     RTSPHeader reply1, *reply = &reply1;
1055     unsigned char *content = NULL;
1056     int lower_transport_mask = 0;
1057     char real_challenge[64];
1058
1059     /* extract hostname and port */
1060     url_split(NULL, 0, NULL, 0,
1061               host, sizeof(host), &port, path, sizeof(path), s->filename);
1062     if (port < 0)
1063         port = RTSP_DEFAULT_PORT;
1064
1065     /* search for options */
1066     option_list = strchr(path, '?');
1067     if (option_list) {
1068         /* remove the options from the path */
1069         *option_list++ = 0;
1070         while(option_list) {
1071             /* move the option pointer */
1072             option = option_list;
1073             option_list = strchr(option_list, '&');
1074             if (option_list)
1075                 *(option_list++) = 0;
1076             /* handle the options */
1077             if (strcmp(option, "udp") == 0)
1078                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1079             else if (strcmp(option, "multicast") == 0)
1080                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1081             else if (strcmp(option, "tcp") == 0)
1082                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1083         }
1084     }
1085
1086     if (!lower_transport_mask)
1087         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_LAST) - 1;
1088
1089     /* open the tcp connexion */
1090     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1091     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1092         return AVERROR(EIO);
1093     rt->rtsp_hd = rtsp_hd;
1094     rt->seq = 0;
1095
1096     /* request options supported by the server; this also detects server type */
1097     for (rt->server_type = RTSP_SERVER_RTP;;) {
1098         snprintf(cmd, sizeof(cmd),
1099                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1100         if (rt->server_type == RTSP_SERVER_REAL)
1101             av_strlcat(cmd,
1102                        /**
1103                         * The following entries are required for proper
1104                         * streaming from a Realmedia server. They are
1105                         * interdependent in some way although we currently
1106                         * don't quite understand how. Values were copied
1107                         * from mplayer SVN r23589.
1108                         * @param CompanyID is a 16-byte ID in base64
1109                         * @param ClientChallenge is a 16-byte ID in hex
1110                         */
1111                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1112                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1113                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1114                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1115                        sizeof(cmd));
1116         rtsp_send_cmd(s, cmd, reply, NULL);
1117         if (reply->status_code != RTSP_STATUS_OK) {
1118             err = AVERROR_INVALIDDATA;
1119             goto fail;
1120         }
1121
1122         /* detect server type if not standard-compliant RTP */
1123         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1124             rt->server_type = RTSP_SERVER_REAL;
1125             continue;
1126         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1127             rt->server_type = RTSP_SERVER_WMS;
1128         } else if (rt->server_type == RTSP_SERVER_REAL) {
1129             strcpy(real_challenge, reply->real_challenge);
1130         }
1131         break;
1132     }
1133
1134     /* describe the stream */
1135     snprintf(cmd, sizeof(cmd),
1136              "DESCRIBE %s RTSP/1.0\r\n"
1137              "Accept: application/sdp\r\n",
1138              s->filename);
1139     if (rt->server_type == RTSP_SERVER_REAL) {
1140         /**
1141          * The Require: attribute is needed for proper streaming from
1142          * Realmedia servers.
1143          */
1144         av_strlcat(cmd,
1145                    "Require: com.real.retain-entity-for-setup\r\n",
1146                    sizeof(cmd));
1147     }
1148     rtsp_send_cmd(s, cmd, reply, &content);
1149     if (!content) {
1150         err = AVERROR_INVALIDDATA;
1151         goto fail;
1152     }
1153     if (reply->status_code != RTSP_STATUS_OK) {
1154         err = AVERROR_INVALIDDATA;
1155         goto fail;
1156     }
1157
1158     /* now we got the SDP description, we parse it */
1159     ret = sdp_parse(s, (const char *)content);
1160     av_freep(&content);
1161     if (ret < 0) {
1162         err = AVERROR_INVALIDDATA;
1163         goto fail;
1164     }
1165
1166     do {
1167         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1168
1169         err = make_setup_request(s, host, port, lower_transport,
1170                                  rt->server_type == RTSP_SERVER_REAL ?
1171                                      real_challenge : NULL);
1172         if (err < 0)
1173             goto fail;
1174         lower_transport_mask &= ~(1 << lower_transport);
1175         if (lower_transport_mask == 0 && err == 1) {
1176             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1177             goto fail;
1178         }
1179     } while (err);
1180
1181     rt->state = RTSP_STATE_IDLE;
1182     rt->seek_timestamp = 0; /* default is to start stream at position
1183                                zero */
1184     if (ap->initial_pause) {
1185         /* do not start immediately */
1186     } else {
1187         if (rtsp_read_play(s) < 0) {
1188             err = AVERROR_INVALIDDATA;
1189             goto fail;
1190         }
1191     }
1192     return 0;
1193  fail:
1194     rtsp_close_streams(rt);
1195     av_freep(&content);
1196     url_close(rt->rtsp_hd);
1197     return err;
1198 }
1199
1200 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1201                            uint8_t *buf, int buf_size)
1202 {
1203     RTSPState *rt = s->priv_data;
1204     int id, len, i, ret;
1205     RTSPStream *rtsp_st;
1206
1207 #ifdef DEBUG_RTP_TCP
1208     printf("tcp_read_packet:\n");
1209 #endif
1210  redo:
1211     for(;;) {
1212         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1213 #ifdef DEBUG_RTP_TCP
1214         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1215 #endif
1216         if (ret != 1)
1217             return -1;
1218         if (buf[0] == '$')
1219             break;
1220     }
1221     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1222     if (ret != 3)
1223         return -1;
1224     id = buf[0];
1225     len = AV_RB16(buf + 1);
1226 #ifdef DEBUG_RTP_TCP
1227     printf("id=%d len=%d\n", id, len);
1228 #endif
1229     if (len > buf_size || len < 12)
1230         goto redo;
1231     /* get the data */
1232     ret = url_readbuf(rt->rtsp_hd, buf, len);
1233     if (ret != len)
1234         return -1;
1235     if (rt->transport == RTSP_TRANSPORT_RDT &&
1236         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1237         return -1;
1238
1239     /* find the matching stream */
1240     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1241         rtsp_st = rt->rtsp_streams[i];
1242         if (id >= rtsp_st->interleaved_min &&
1243             id <= rtsp_st->interleaved_max)
1244             goto found;
1245     }
1246     goto redo;
1247  found:
1248     *prtsp_st = rtsp_st;
1249     return len;
1250 }
1251
1252 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1253                            uint8_t *buf, int buf_size)
1254 {
1255     RTSPState *rt = s->priv_data;
1256     RTSPStream *rtsp_st;
1257     fd_set rfds;
1258     int fd1, fd2, fd_max, n, i, ret;
1259     struct timeval tv;
1260
1261     for(;;) {
1262         if (url_interrupt_cb())
1263             return AVERROR(EINTR);
1264         FD_ZERO(&rfds);
1265         fd_max = -1;
1266         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1267             rtsp_st = rt->rtsp_streams[i];
1268             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1269             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1270             if (fd1 > fd_max)
1271                 fd_max = fd1;
1272             FD_SET(fd1, &rfds);
1273         }
1274         tv.tv_sec = 0;
1275         tv.tv_usec = 100 * 1000;
1276         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1277         if (n > 0) {
1278             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1279                 rtsp_st = rt->rtsp_streams[i];
1280                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1281                 if (FD_ISSET(fd1, &rfds)) {
1282                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1283                     if (ret > 0) {
1284                         *prtsp_st = rtsp_st;
1285                         return ret;
1286                     }
1287                 }
1288             }
1289         }
1290     }
1291 }
1292
1293 static int rtsp_read_packet(AVFormatContext *s,
1294                             AVPacket *pkt)
1295 {
1296     RTSPState *rt = s->priv_data;
1297     RTSPStream *rtsp_st;
1298     int ret, len;
1299     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1300
1301     if (rt->server_type == RTSP_SERVER_REAL) {
1302         int i;
1303         RTSPHeader reply1, *reply = &reply1;
1304         enum AVDiscard cache[MAX_STREAMS];
1305         char cmd[1024];
1306
1307         for (i = 0; i < s->nb_streams; i++)
1308             cache[i] = s->streams[i]->discard;
1309
1310         if (!rt->need_subscription) {
1311             if (memcmp (cache, rt->real_setup_cache,
1312                         sizeof(enum AVDiscard) * s->nb_streams)) {
1313                 av_strlcatf(cmd, sizeof(cmd),
1314                             "SET_PARAMETER %s RTSP/1.0\r\n"
1315                             "Unsubscribe: %s\r\n",
1316                             s->filename, rt->last_subscription);
1317                 rtsp_send_cmd(s, cmd, reply, NULL);
1318                 if (reply->status_code != RTSP_STATUS_OK)
1319                     return AVERROR_INVALIDDATA;
1320                 rt->need_subscription = 1;
1321             }
1322         }
1323
1324         if (rt->need_subscription) {
1325             int r, rule_nr, first = 1;
1326
1327             memcpy(rt->real_setup_cache, cache,
1328                    sizeof(enum AVDiscard) * s->nb_streams);
1329             rt->last_subscription[0] = 0;
1330
1331             snprintf(cmd, sizeof(cmd),
1332                      "SET_PARAMETER %s RTSP/1.0\r\n"
1333                      "Subscribe: ",
1334                      s->filename);
1335             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1336                 rule_nr = 0;
1337                 for (r = 0; r < s->nb_streams; r++) {
1338                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1339                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1340                             if (!first)
1341                                 av_strlcat(rt->last_subscription, ",",
1342                                            sizeof(rt->last_subscription));
1343                             ff_rdt_subscribe_rule(
1344                                 rt->last_subscription,
1345                                 sizeof(rt->last_subscription), i, rule_nr);
1346                             first = 0;
1347                         }
1348                         rule_nr++;
1349                     }
1350                 }
1351             }
1352             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1353             rtsp_send_cmd(s, cmd, reply, NULL);
1354             if (reply->status_code != RTSP_STATUS_OK)
1355                 return AVERROR_INVALIDDATA;
1356             rt->need_subscription = 0;
1357
1358             if (rt->state == RTSP_STATE_PLAYING)
1359                 rtsp_read_play (s);
1360         }
1361     }
1362
1363     /* get next frames from the same RTP packet */
1364     if (rt->cur_tx) {
1365         if (rt->transport == RTSP_TRANSPORT_RDT)
1366             ret = ff_rdt_parse_packet(rt->cur_tx, pkt, NULL, 0);
1367         else
1368             ret = rtp_parse_packet(rt->cur_tx, pkt, NULL, 0);
1369         if (ret == 0) {
1370             rt->cur_tx = NULL;
1371             return 0;
1372         } else if (ret == 1) {
1373             return 0;
1374         } else {
1375             rt->cur_tx = NULL;
1376         }
1377     }
1378
1379     /* read next RTP packet */
1380  redo:
1381     switch(rt->lower_transport) {
1382     default:
1383     case RTSP_LOWER_TRANSPORT_TCP:
1384         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1385         break;
1386     case RTSP_LOWER_TRANSPORT_UDP:
1387     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1388         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1389         if (len >=0 && rtsp_st->tx_ctx && rt->transport == RTSP_TRANSPORT_RTP)
1390             rtp_check_and_send_back_rr(rtsp_st->tx_ctx, len);
1391         break;
1392     }
1393     if (len < 0)
1394         return len;
1395     if (rt->transport == RTSP_TRANSPORT_RDT)
1396         ret = ff_rdt_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1397     else
1398         ret = rtp_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1399     if (ret < 0)
1400         goto redo;
1401     if (ret == 1) {
1402         /* more packets may follow, so we save the RTP context */
1403         rt->cur_tx = rtsp_st->tx_ctx;
1404     }
1405     return 0;
1406 }
1407
1408 static int rtsp_read_play(AVFormatContext *s)
1409 {
1410     RTSPState *rt = s->priv_data;
1411     RTSPHeader reply1, *reply = &reply1;
1412     char cmd[1024];
1413
1414     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1415
1416     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1417         if (rt->state == RTSP_STATE_PAUSED) {
1418             snprintf(cmd, sizeof(cmd),
1419                      "PLAY %s RTSP/1.0\r\n",
1420                      s->filename);
1421         } else {
1422             snprintf(cmd, sizeof(cmd),
1423                      "PLAY %s RTSP/1.0\r\n"
1424                      "Range: npt=%0.3f-\r\n",
1425                      s->filename,
1426                      (double)rt->seek_timestamp / AV_TIME_BASE);
1427         }
1428         rtsp_send_cmd(s, cmd, reply, NULL);
1429         if (reply->status_code != RTSP_STATUS_OK) {
1430             return -1;
1431         }
1432     }
1433     rt->state = RTSP_STATE_PLAYING;
1434     return 0;
1435 }
1436
1437 /* pause the stream */
1438 static int rtsp_read_pause(AVFormatContext *s)
1439 {
1440     RTSPState *rt = s->priv_data;
1441     RTSPHeader reply1, *reply = &reply1;
1442     char cmd[1024];
1443
1444     rt = s->priv_data;
1445
1446     if (rt->state != RTSP_STATE_PLAYING)
1447         return 0;
1448     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1449         snprintf(cmd, sizeof(cmd),
1450                  "PAUSE %s RTSP/1.0\r\n",
1451                  s->filename);
1452         rtsp_send_cmd(s, cmd, reply, NULL);
1453         if (reply->status_code != RTSP_STATUS_OK) {
1454             return -1;
1455         }
1456     }
1457     rt->state = RTSP_STATE_PAUSED;
1458     return 0;
1459 }
1460
1461 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1462                           int64_t timestamp, int flags)
1463 {
1464     RTSPState *rt = s->priv_data;
1465
1466     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1467     switch(rt->state) {
1468     default:
1469     case RTSP_STATE_IDLE:
1470         break;
1471     case RTSP_STATE_PLAYING:
1472         if (rtsp_read_play(s) != 0)
1473             return -1;
1474         break;
1475     case RTSP_STATE_PAUSED:
1476         rt->state = RTSP_STATE_IDLE;
1477         break;
1478     }
1479     return 0;
1480 }
1481
1482 static int rtsp_read_close(AVFormatContext *s)
1483 {
1484     RTSPState *rt = s->priv_data;
1485     RTSPHeader reply1, *reply = &reply1;
1486     char cmd[1024];
1487
1488 #if 0
1489     /* NOTE: it is valid to flush the buffer here */
1490     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1491         url_fclose(&rt->rtsp_gb);
1492     }
1493 #endif
1494     snprintf(cmd, sizeof(cmd),
1495              "TEARDOWN %s RTSP/1.0\r\n",
1496              s->filename);
1497     rtsp_send_cmd(s, cmd, reply, NULL);
1498
1499     rtsp_close_streams(rt);
1500     url_close(rt->rtsp_hd);
1501     return 0;
1502 }
1503
1504 #ifdef CONFIG_RTSP_DEMUXER
1505 AVInputFormat rtsp_demuxer = {
1506     "rtsp",
1507     NULL_IF_CONFIG_SMALL("RTSP input format"),
1508     sizeof(RTSPState),
1509     rtsp_probe,
1510     rtsp_read_header,
1511     rtsp_read_packet,
1512     rtsp_read_close,
1513     rtsp_read_seek,
1514     .flags = AVFMT_NOFILE,
1515     .read_play = rtsp_read_play,
1516     .read_pause = rtsp_read_pause,
1517 };
1518 #endif
1519
1520 static int sdp_probe(AVProbeData *p1)
1521 {
1522     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1523
1524     /* we look for a line beginning "c=IN IP4" */
1525     while (p < p_end && *p != '\0') {
1526         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1527             return AVPROBE_SCORE_MAX / 2;
1528
1529         while(p < p_end - 1 && *p != '\n') p++;
1530         if (++p >= p_end)
1531             break;
1532         if (*p == '\r')
1533             p++;
1534     }
1535     return 0;
1536 }
1537
1538 #define SDP_MAX_SIZE 8192
1539
1540 static int sdp_read_header(AVFormatContext *s,
1541                            AVFormatParameters *ap)
1542 {
1543     RTSPState *rt = s->priv_data;
1544     RTSPStream *rtsp_st;
1545     int size, i, err;
1546     char *content;
1547     char url[1024];
1548
1549     /* read the whole sdp file */
1550     /* XXX: better loading */
1551     content = av_malloc(SDP_MAX_SIZE);
1552     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1553     if (size <= 0) {
1554         av_free(content);
1555         return AVERROR_INVALIDDATA;
1556     }
1557     content[size] ='\0';
1558
1559     sdp_parse(s, content);
1560     av_free(content);
1561
1562     /* open each RTP stream */
1563     for(i=0;i<rt->nb_rtsp_streams;i++) {
1564         rtsp_st = rt->rtsp_streams[i];
1565
1566         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1567                  inet_ntoa(rtsp_st->sdp_ip),
1568                  rtsp_st->sdp_port,
1569                  rtsp_st->sdp_port,
1570                  rtsp_st->sdp_ttl);
1571         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1572             err = AVERROR_INVALIDDATA;
1573             goto fail;
1574         }
1575         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1576             goto fail;
1577     }
1578     return 0;
1579  fail:
1580     rtsp_close_streams(rt);
1581     return err;
1582 }
1583
1584 static int sdp_read_packet(AVFormatContext *s,
1585                             AVPacket *pkt)
1586 {
1587     return rtsp_read_packet(s, pkt);
1588 }
1589
1590 static int sdp_read_close(AVFormatContext *s)
1591 {
1592     RTSPState *rt = s->priv_data;
1593     rtsp_close_streams(rt);
1594     return 0;
1595 }
1596
1597 #ifdef CONFIG_SDP_DEMUXER
1598 AVInputFormat sdp_demuxer = {
1599     "sdp",
1600     NULL_IF_CONFIG_SMALL("SDP"),
1601     sizeof(RTSPState),
1602     sdp_probe,
1603     sdp_read_header,
1604     sdp_read_packet,
1605     sdp_read_close,
1606 };
1607 #endif
1608
1609 #ifdef CONFIG_REDIR_DEMUXER
1610 /* dummy redirector format (used directly in av_open_input_file now) */
1611 static int redir_probe(AVProbeData *pd)
1612 {
1613     const char *p;
1614     p = pd->buf;
1615     while (redir_isspace(*p))
1616         p++;
1617     if (av_strstart(p, "http://", NULL) ||
1618         av_strstart(p, "rtsp://", NULL))
1619         return AVPROBE_SCORE_MAX;
1620     return 0;
1621 }
1622
1623 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1624 {
1625     char buf[4096], *q;
1626     int c;
1627     AVFormatContext *ic = NULL;
1628     ByteIOContext *f = s->pb;
1629
1630     /* parse each URL and try to open it */
1631     c = url_fgetc(f);
1632     while (c != URL_EOF) {
1633         /* skip spaces */
1634         for(;;) {
1635             if (!redir_isspace(c))
1636                 break;
1637             c = url_fgetc(f);
1638         }
1639         if (c == URL_EOF)
1640             break;
1641         /* record url */
1642         q = buf;
1643         for(;;) {
1644             if (c == URL_EOF || redir_isspace(c))
1645                 break;
1646             if ((q - buf) < sizeof(buf) - 1)
1647                 *q++ = c;
1648             c = url_fgetc(f);
1649         }
1650         *q = '\0';
1651         //printf("URL='%s'\n", buf);
1652         /* try to open the media file */
1653         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1654             break;
1655     }
1656     if (!ic)
1657         return AVERROR(EIO);
1658
1659     *s = *ic;
1660     url_fclose(f);
1661
1662     return 0;
1663 }
1664
1665 AVInputFormat redir_demuxer = {
1666     "redir",
1667     NULL_IF_CONFIG_SMALL("Redirector format"),
1668     0,
1669     redir_probe,
1670     redir_read_header,
1671     NULL,
1672     NULL,
1673 };
1674 #endif