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 "libavutil/intreadwrite.h"
  27 #include "avformat.h"
  28
  29 #include <sys/time.h>
  30 #if HAVE_SYS_SELECT_H
  31 #include <sys/select.h>
  32 #endif
  33 #include <strings.h>
  34 #include "network.h"
  35 #include "rtsp.h"
  36
  37 #include "rtpdec.h"
  38 #include "rdt.h"
  39 #include "rtp_asf.h"
  40
  41 //#define DEBUG
  42 //#define DEBUG_RTP_TCP
  43
  44 static int rtsp_read_play(AVFormatContext *s);
  45
  46 /* XXX: currently, the only way to change the protocols consists in
  47    changing this variable */
  48
  49 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  50 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
  51 #endif
  52
  53 static int rtsp_probe(AVProbeData *p)
  54 {
  55     if (av_strstart(p->filename, "rtsp:", NULL))
  56         return AVPROBE_SCORE_MAX;
  57     return 0;
  58 }
  59
  60 static int redir_isspace(int c)
  61 {
  62     return c == ' ' || c == '\t' || c == '\n' || c == '\r';
  63 }
  64
  65 static void skip_spaces(const char **pp)
  66 {
  67     const char *p;
  68     p = *pp;
  69     while (redir_isspace(*p))
  70         p++;
  71     *pp = p;
  72 }
  73
  74 static void get_word_sep(char *buf, int buf_size, const char *sep,
  75                          const char **pp)
  76 {
  77     const char *p;
  78     char *q;
  79
  80     p = *pp;
  81     if (*p == '/')
  82         p++;
  83     skip_spaces(&p);
  84     q = buf;
  85     while (!strchr(sep, *p) && *p != '\0') {
  86         if ((q - buf) < buf_size - 1)
  87             *q++ = *p;
  88         p++;
  89     }
  90     if (buf_size > 0)
  91         *q = '\0';
  92     *pp = p;
  93 }
  94
  95 static void get_word(char *buf, int buf_size, const char **pp)
  96 {
  97     const char *p;
  98     char *q;
  99
 100     p = *pp;
 101     skip_spaces(&p);
 102     q = buf;
 103     while (!redir_isspace(*p) && *p != '\0') {
 104         if ((q - buf) < buf_size - 1)
 105             *q++ = *p;
 106         p++;
 107     }
 108     if (buf_size > 0)
 109         *q = '\0';
 110     *pp = p;
 111 }
 112
 113 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 114    params>] */
 115 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 116 {
 117     char buf[256];
 118     int i;
 119     AVCodec *c;
 120     const char *c_name;
 121
 122     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 123        see if we can handle this kind of payload */
 124     get_word_sep(buf, sizeof(buf), "/", &p);
 125     if (payload_type >= RTP_PT_PRIVATE) {
 126         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 127         while(handler) {
 128             if (!strcasecmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 129                 codec->codec_id = handler->codec_id;
 130                 rtsp_st->dynamic_handler= handler;
 131                 if(handler->open) {
 132                     rtsp_st->dynamic_protocol_context= handler->open();
 133                 }
 134                 break;
 135             }
 136             handler= handler->next;
 137         }
 138     } else {
 139         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 140         /* search into AVRtpPayloadTypes[] */
 141         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 142     }
 143
 144     c = avcodec_find_decoder(codec->codec_id);
 145     if (c && c->name)
 146         c_name = c->name;
 147     else
 148         c_name = (char *)NULL;
 149
 150     if (c_name) {
 151         get_word_sep(buf, sizeof(buf), "/", &p);
 152         i = atoi(buf);
 153         switch (codec->codec_type) {
 154             case CODEC_TYPE_AUDIO:
 155                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 156                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 157                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 158                 if (i > 0) {
 159                     codec->sample_rate = i;
 160                     get_word_sep(buf, sizeof(buf), "/", &p);
 161                     i = atoi(buf);
 162                     if (i > 0)
 163                         codec->channels = i;
 164                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 165                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 166                 }
 167                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 168                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 169                 break;
 170             case CODEC_TYPE_VIDEO:
 171                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 172                 break;
 173             default:
 174                 break;
 175         }
 176         return 0;
 177     }
 178
 179     return -1;
 180 }
 181
 182 /* return the length and optionnaly the data */
 183 static int hex_to_data(uint8_t *data, const char *p)
 184 {
 185     int c, len, v;
 186
 187     len = 0;
 188     v = 1;
 189     for(;;) {
 190         skip_spaces(&p);
 191         if (p == '\0')
 192             break;
 193         c = toupper((unsigned char)*p++);
 194         if (c >= '0' && c <= '9')
 195             c = c - '0';
 196         else if (c >= 'A' && c <= 'F')
 197             c = c - 'A' + 10;
 198         else
 199             break;
 200         v = (v << 4) | c;
 201         if (v & 0x100) {
 202             if (data)
 203                 data[len] = v;
 204             len++;
 205             v = 1;
 206         }
 207     }
 208     return len;
 209 }
 210
 211 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 212 {
 213     switch (codec->codec_id) {
 214         case CODEC_ID_MPEG4:
 215         case CODEC_ID_AAC:
 216             if (!strcmp(attr, "config")) {
 217                 /* decode the hexa encoded parameter */
 218                 int len = hex_to_data(NULL, value);
 219                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 220                 if (!codec->extradata)
 221                     return;
 222                 codec->extradata_size = len;
 223                 hex_to_data(codec->extradata, value);
 224             }
 225             break;
 226         default:
 227             break;
 228     }
 229     return;
 230 }
 231
 232 typedef struct {
 233     const char *str;
 234     uint16_t type;
 235     uint32_t offset;
 236 } AttrNameMap;
 237
 238 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 239 #define ATTR_NAME_TYPE_INT 0
 240 #define ATTR_NAME_TYPE_STR 1
 241 static const AttrNameMap attr_names[]=
 242 {
 243     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, sizelength)},
 244     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexlength)},
 245     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexdeltalength)},
 246     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, profile_level_id)},
 247     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, streamtype)},
 248     {"mode",             ATTR_NAME_TYPE_STR, offsetof(RTPPayloadData, mode)},
 249     {NULL, -1, -1},
 250 };
 251
 252 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 253 * because it is used in rtp_h264.c, which is forthcoming.
 254 */
 255 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 256 {
 257     skip_spaces(p);
 258     if(**p)
 259     {
 260         get_word_sep(attr, attr_size, "=", p);
 261         if (**p == '=')
 262             (*p)++;
 263         get_word_sep(value, value_size, ";", p);
 264         if (**p == ';')
 265             (*p)++;
 266         return 1;
 267     }
 268     return 0;
 269 }
 270
 271 /* parse a SDP line and save stream attributes */
 272 static void sdp_parse_fmtp(AVStream *st, const char *p)
 273 {
 274     char attr[256];
 275     char value[4096];
 276     int i;
 277
 278     RTSPStream *rtsp_st = st->priv_data;
 279     AVCodecContext *codec = st->codec;
 280     RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
 281
 282     /* loop on each attribute */
 283     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 284     {
 285         /* grab the codec extra_data from the config parameter of the fmtp line */
 286         sdp_parse_fmtp_config(codec, attr, value);
 287         /* Looking for a known attribute */
 288         for (i = 0; attr_names[i].str; ++i) {
 289             if (!strcasecmp(attr, attr_names[i].str)) {
 290                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 291                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 292                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 293                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 294             }
 295         }
 296     }
 297 }
 298
 299 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 300  *  and end time.
 301  *  Used for seeking in the rtp stream.
 302  */
 303 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 304 {
 305     char buf[256];
 306
 307     skip_spaces(&p);
 308     if (!av_stristart(p, "npt=", &p))
 309         return;
 310
 311     *start = AV_NOPTS_VALUE;
 312     *end = AV_NOPTS_VALUE;
 313
 314     get_word_sep(buf, sizeof(buf), "-", &p);
 315     *start = parse_date(buf, 1);
 316     if (*p == '-') {
 317         p++;
 318         get_word_sep(buf, sizeof(buf), "-", &p);
 319         *end = parse_date(buf, 1);
 320     }
 321 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 322 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 323 }
 324
 325 typedef struct SDPParseState {
 326     /* SDP only */
 327     struct in_addr default_ip;
 328     int default_ttl;
 329     int skip_media; ///< set if an unknown m= line occurs
 330 } SDPParseState;
 331
 332 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 333                            int letter, const char *buf)
 334 {
 335     RTSPState *rt = s->priv_data;
 336     char buf1[64], st_type[64];
 337     const char *p;
 338     enum CodecType codec_type;
 339     int payload_type, i;
 340     AVStream *st;
 341     RTSPStream *rtsp_st;
 342     struct in_addr sdp_ip;
 343     int ttl;
 344
 345 #ifdef DEBUG
 346     printf("sdp: %c='%s'\n", letter, buf);
 347 #endif
 348
 349     p = buf;
 350     if (s1->skip_media && letter != 'm')
 351         return;
 352     switch(letter) {
 353     case 'c':
 354         get_word(buf1, sizeof(buf1), &p);
 355         if (strcmp(buf1, "IN") != 0)
 356             return;
 357         get_word(buf1, sizeof(buf1), &p);
 358         if (strcmp(buf1, "IP4") != 0)
 359             return;
 360         get_word_sep(buf1, sizeof(buf1), "/", &p);
 361         if (inet_aton(buf1, &sdp_ip) == 0)
 362             return;
 363         ttl = 16;
 364         if (*p == '/') {
 365             p++;
 366             get_word_sep(buf1, sizeof(buf1), "/", &p);
 367             ttl = atoi(buf1);
 368         }
 369         if (s->nb_streams == 0) {
 370             s1->default_ip = sdp_ip;
 371             s1->default_ttl = ttl;
 372         } else {
 373             st = s->streams[s->nb_streams - 1];
 374             rtsp_st = st->priv_data;
 375             rtsp_st->sdp_ip = sdp_ip;
 376             rtsp_st->sdp_ttl = ttl;
 377         }
 378         break;
 379     case 's':
 380         av_metadata_set(&s->metadata, "title", p);
 381         break;
 382     case 'i':
 383         if (s->nb_streams == 0) {
 384             av_metadata_set(&s->metadata, "comment", p);
 385             break;
 386         }
 387         break;
 388     case 'm':
 389         /* new stream */
 390         s1->skip_media = 0;
 391         get_word(st_type, sizeof(st_type), &p);
 392         if (!strcmp(st_type, "audio")) {
 393             codec_type = CODEC_TYPE_AUDIO;
 394         } else if (!strcmp(st_type, "video")) {
 395             codec_type = CODEC_TYPE_VIDEO;
 396         } else if (!strcmp(st_type, "application")) {
 397             codec_type = CODEC_TYPE_DATA;
 398         } else {
 399             s1->skip_media = 1;
 400             return;
 401         }
 402         rtsp_st = av_mallocz(sizeof(RTSPStream));
 403         if (!rtsp_st)
 404             return;
 405         rtsp_st->stream_index = -1;
 406         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 407
 408         rtsp_st->sdp_ip = s1->default_ip;
 409         rtsp_st->sdp_ttl = s1->default_ttl;
 410
 411         get_word(buf1, sizeof(buf1), &p); /* port */
 412         rtsp_st->sdp_port = atoi(buf1);
 413
 414         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 415
 416         /* XXX: handle list of formats */
 417         get_word(buf1, sizeof(buf1), &p); /* format list */
 418         rtsp_st->sdp_payload_type = atoi(buf1);
 419
 420         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 421             /* no corresponding stream */
 422         } else {
 423             st = av_new_stream(s, 0);
 424             if (!st)
 425                 return;
 426             st->priv_data = rtsp_st;
 427             rtsp_st->stream_index = st->index;
 428             st->codec->codec_type = codec_type;
 429             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 430                 /* if standard payload type, we can find the codec right now */
 431                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 432             }
 433         }
 434         /* put a default control url */
 435         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 436         break;
 437     case 'a':
 438         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 439             char proto[32];
 440             /* get the control url */
 441             st = s->streams[s->nb_streams - 1];
 442             rtsp_st = st->priv_data;
 443
 444             /* XXX: may need to add full url resolution */
 445             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 446             if (proto[0] == '\0') {
 447                 /* relative control URL */
 448                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 449                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 450             } else {
 451                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 452             }
 453         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 454             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 455             get_word(buf1, sizeof(buf1), &p);
 456             payload_type = atoi(buf1);
 457             st = s->streams[s->nb_streams - 1];
 458             rtsp_st = st->priv_data;
 459             sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 460         } else if (av_strstart(p, "fmtp:", &p)) {
 461             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 462             get_word(buf1, sizeof(buf1), &p);
 463             payload_type = atoi(buf1);
 464             for(i = 0; i < s->nb_streams;i++) {
 465                 st = s->streams[i];
 466                 rtsp_st = st->priv_data;
 467                 if (rtsp_st->sdp_payload_type == payload_type) {
 468                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 469                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
 470                             sdp_parse_fmtp(st, p);
 471                         }
 472                     } else {
 473                         sdp_parse_fmtp(st, p);
 474                     }
 475                 }
 476             }
 477         } else if(av_strstart(p, "framesize:", &p)) {
 478             // let dynamic protocol handlers have a stab at the line.
 479             get_word(buf1, sizeof(buf1), &p);
 480             payload_type = atoi(buf1);
 481             for(i = 0; i < s->nb_streams;i++) {
 482                 st = s->streams[i];
 483                 rtsp_st = st->priv_data;
 484                 if (rtsp_st->sdp_payload_type == payload_type) {
 485                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 486                         rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
 487                     }
 488                 }
 489             }
 490         } else if(av_strstart(p, "range:", &p)) {
 491             int64_t start, end;
 492
 493             // this is so that seeking on a streamed file can work.
 494             rtsp_parse_range_npt(p, &start, &end);
 495             s->start_time= start;
 496             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 497         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 498             if (atoi(p) == 1)
 499                 rt->transport = RTSP_TRANSPORT_RDT;
 500         } else {
 501             if (rt->server_type == RTSP_SERVER_WMS)
 502                 ff_wms_parse_sdp_a_line(s, p);
 503             if (s->nb_streams > 0) {
 504                 if (rt->server_type == RTSP_SERVER_REAL)
 505                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 506
 507                 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 508                 if (rtsp_st->dynamic_handler &&
 509                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 510                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
 511                         rtsp_st->dynamic_protocol_context, buf);
 512             }
 513         }
 514         break;
 515     }
 516 }
 517
 518 static int sdp_parse(AVFormatContext *s, const char *content)
 519 {
 520     const char *p;
 521     int letter;
 522     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 523      * contain long SDP lines containing complete ASF Headers (several
 524      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 525      * "rulebooks" describing their properties. Therefore, the SDP line
 526      * buffer is large. */
 527     char buf[8192], *q;
 528     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 529
 530     memset(s1, 0, sizeof(SDPParseState));
 531     p = content;
 532     for(;;) {
 533         skip_spaces(&p);
 534         letter = *p;
 535         if (letter == '\0')
 536             break;
 537         p++;
 538         if (*p != '=')
 539             goto next_line;
 540         p++;
 541         /* get the content */
 542         q = buf;
 543         while (*p != '\n' && *p != '\r' && *p != '\0') {
 544             if ((q - buf) < sizeof(buf) - 1)
 545                 *q++ = *p;
 546             p++;
 547         }
 548         *q = '\0';
 549         sdp_parse_line(s, s1, letter, buf);
 550     next_line:
 551         while (*p != '\n' && *p != '\0')
 552             p++;
 553         if (*p == '\n')
 554             p++;
 555     }
 556     return 0;
 557 }
 558
 559 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 560 {
 561     const char *p;
 562     int v;
 563
 564     p = *pp;
 565     skip_spaces(&p);
 566     v = strtol(p, (char **)&p, 10);
 567     if (*p == '-') {
 568         p++;
 569         *min_ptr = v;
 570         v = strtol(p, (char **)&p, 10);
 571         *max_ptr = v;
 572     } else {
 573         *min_ptr = v;
 574         *max_ptr = v;
 575     }
 576     *pp = p;
 577 }
 578
 579 /* XXX: only one transport specification is parsed */
 580 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
 581 {
 582     char transport_protocol[16];
 583     char profile[16];
 584     char lower_transport[16];
 585     char parameter[16];
 586     RTSPTransportField *th;
 587     char buf[256];
 588
 589     reply->nb_transports = 0;
 590
 591     for(;;) {
 592         skip_spaces(&p);
 593         if (*p == '\0')
 594             break;
 595
 596         th = &reply->transports[reply->nb_transports];
 597
 598         get_word_sep(transport_protocol, sizeof(transport_protocol),
 599                      "/", &p);
 600         if (*p == '/')
 601             p++;
 602         if (!strcasecmp (transport_protocol, "rtp")) {
 603             get_word_sep(profile, sizeof(profile), "/;,", &p);
 604             lower_transport[0] = '\0';
 605             /* rtp/avp/<protocol> */
 606             if (*p == '/') {
 607                 p++;
 608                 get_word_sep(lower_transport, sizeof(lower_transport),
 609                              ";,", &p);
 610             }
 611             th->transport = RTSP_TRANSPORT_RTP;
 612         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 613                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 614             /* x-pn-tng/<protocol> */
 615             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 616             profile[0] = '\0';
 617             th->transport = RTSP_TRANSPORT_RDT;
 618         }
 619         if (!strcasecmp(lower_transport, "TCP"))
 620             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 621         else
 622             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 623
 624         if (*p == ';')
 625             p++;
 626         /* get each parameter */
 627         while (*p != '\0' && *p != ',') {
 628             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 629             if (!strcmp(parameter, "port")) {
 630                 if (*p == '=') {
 631                     p++;
 632                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 633                 }
 634             } else if (!strcmp(parameter, "client_port")) {
 635                 if (*p == '=') {
 636                     p++;
 637                     rtsp_parse_range(&th->client_port_min,
 638                                      &th->client_port_max, &p);
 639                 }
 640             } else if (!strcmp(parameter, "server_port")) {
 641                 if (*p == '=') {
 642                     p++;
 643                     rtsp_parse_range(&th->server_port_min,
 644                                      &th->server_port_max, &p);
 645                 }
 646             } else if (!strcmp(parameter, "interleaved")) {
 647                 if (*p == '=') {
 648                     p++;
 649                     rtsp_parse_range(&th->interleaved_min,
 650                                      &th->interleaved_max, &p);
 651                 }
 652             } else if (!strcmp(parameter, "multicast")) {
 653                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 654                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 655             } else if (!strcmp(parameter, "ttl")) {
 656                 if (*p == '=') {
 657                     p++;
 658                     th->ttl = strtol(p, (char **)&p, 10);
 659                 }
 660             } else if (!strcmp(parameter, "destination")) {
 661                 struct in_addr ipaddr;
 662
 663                 if (*p == '=') {
 664                     p++;
 665                     get_word_sep(buf, sizeof(buf), ";,", &p);
 666                     if (inet_aton(buf, &ipaddr))
 667                         th->destination = ntohl(ipaddr.s_addr);
 668                 }
 669             }
 670             while (*p != ';' && *p != '\0' && *p != ',')
 671                 p++;
 672             if (*p == ';')
 673                 p++;
 674         }
 675         if (*p == ',')
 676             p++;
 677
 678         reply->nb_transports++;
 679     }
 680 }
 681
 682 void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
 683 {
 684     const char *p;
 685
 686     /* NOTE: we do case independent match for broken servers */
 687     p = buf;
 688     if (av_stristart(p, "Session:", &p)) {
 689         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 690     } else if (av_stristart(p, "Content-Length:", &p)) {
 691         reply->content_length = strtol(p, NULL, 10);
 692     } else if (av_stristart(p, "Transport:", &p)) {
 693         rtsp_parse_transport(reply, p);
 694     } else if (av_stristart(p, "CSeq:", &p)) {
 695         reply->seq = strtol(p, NULL, 10);
 696     } else if (av_stristart(p, "Range:", &p)) {
 697         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 698     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 699         skip_spaces(&p);
 700         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 701     } else if (av_stristart(p, "Server:", &p)) {
 702         skip_spaces(&p);
 703         av_strlcpy(reply->server, p, sizeof(reply->server));
 704     }
 705 }
 706
 707 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 708 {
 709     int ret, len;
 710
 711     len = 0;
 712     while (len < size) {
 713         ret = url_read(h, buf+len, size-len);
 714         if (ret < 1)
 715             return ret;
 716         len += ret;
 717     }
 718     return len;
 719 }
 720
 721 /* skip a RTP/TCP interleaved packet */
 722 static void rtsp_skip_packet(AVFormatContext *s)
 723 {
 724     RTSPState *rt = s->priv_data;
 725     int ret, len, len1;
 726     uint8_t buf[1024];
 727
 728     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 729     if (ret != 3)
 730         return;
 731     len = AV_RB16(buf + 1);
 732 #ifdef DEBUG
 733     printf("skipping RTP packet len=%d\n", len);
 734 #endif
 735     /* skip payload */
 736     while (len > 0) {
 737         len1 = len;
 738         if (len1 > sizeof(buf))
 739             len1 = sizeof(buf);
 740         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 741         if (ret != len1)
 742             return;
 743         len -= len1;
 744     }
 745 }
 746
 747 /**
 748  * Read a RTSP message from the server, or prepare to read data
 749  * packets if we're reading data interleaved over the TCP/RTSP
 750  * connection as well.
 751  *
 752  * @param s RTSP demuxer context
 753  * @param reply pointer where the RTSP message header will be stored
 754  * @param content_ptr pointer where the RTSP message body, if any, will
 755  *                    be stored (length is in \p reply)
 756  * @param return_on_interleaved_data whether the function may return if we
 757  *                   encounter a data marker ('$'), which precedes data
 758  *                   packets over interleaved TCP/RTSP connections. If this
 759  *                   is set, this function will return 1 after encountering
 760  *                   a '$'. If it is not set, the function will skip any
 761  *                   data packets (if they are encountered), until a reply
 762  *                   has been fully parsed. If no more data is available
 763  *                   without parsing a reply, it will return an error.
 764  *
 765  * @returns 1 if a data packets is ready to be received, -1 on error,
 766  *          and 0 on success.
 767  */
 768 static int
 769 rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
 770                  unsigned char **content_ptr, int return_on_interleaved_data)
 771 {
 772     RTSPState *rt = s->priv_data;
 773     char buf[4096], buf1[1024], *q;
 774     unsigned char ch;
 775     const char *p;
 776     int ret, content_length, line_count = 0;
 777     unsigned char *content = NULL;
 778
 779     memset(reply, 0, sizeof(*reply));
 780
 781     /* parse reply (XXX: use buffers) */
 782     rt->last_reply[0] = '\0';
 783     for(;;) {
 784         q = buf;
 785         for(;;) {
 786             ret = url_readbuf(rt->rtsp_hd, &ch, 1);
 787 #ifdef DEBUG_RTP_TCP
 788             printf("ret=%d c=%02x [%c]\n", ret, ch, ch);
 789 #endif
 790             if (ret != 1)
 791                 return -1;
 792             if (ch == '\n')
 793                 break;
 794             if (ch == '$') {
 795                 /* XXX: only parse it if first char on line ? */
 796                 if (return_on_interleaved_data) {
 797                     return 1;
 798                 } else
 799                 rtsp_skip_packet(s);
 800             } else if (ch != '\r') {
 801                 if ((q - buf) < sizeof(buf) - 1)
 802                     *q++ = ch;
 803             }
 804         }
 805         *q = '\0';
 806 #ifdef DEBUG
 807         printf("line='%s'\n", buf);
 808 #endif
 809         /* test if last line */
 810         if (buf[0] == '\0')
 811             break;
 812         p = buf;
 813         if (line_count == 0) {
 814             /* get reply code */
 815             get_word(buf1, sizeof(buf1), &p);
 816             get_word(buf1, sizeof(buf1), &p);
 817             reply->status_code = atoi(buf1);
 818         } else {
 819             rtsp_parse_line(reply, p);
 820             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 821             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 822         }
 823         line_count++;
 824     }
 825
 826     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 827         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 828
 829     content_length = reply->content_length;
 830     if (content_length > 0) {
 831         /* leave some room for a trailing '\0' (useful for simple parsing) */
 832         content = av_malloc(content_length + 1);
 833         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 834         content[content_length] = '\0';
 835     }
 836     if (content_ptr)
 837         *content_ptr = content;
 838     else
 839         av_free(content);
 840
 841     return 0;
 842 }
 843
 844 static void rtsp_send_cmd(AVFormatContext *s,
 845                           const char *cmd, RTSPMessageHeader *reply,
 846                           unsigned char **content_ptr)
 847 {
 848     RTSPState *rt = s->priv_data;
 849     char buf[4096], buf1[1024];
 850
 851     rt->seq++;
 852     av_strlcpy(buf, cmd, sizeof(buf));
 853     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 854     av_strlcat(buf, buf1, sizeof(buf));
 855     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 856         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 857         av_strlcat(buf, buf1, sizeof(buf));
 858     }
 859     av_strlcat(buf, "\r\n", sizeof(buf));
 860 #ifdef DEBUG
 861     printf("Sending:\n%s--\n", buf);
 862 #endif
 863     url_write(rt->rtsp_hd, buf, strlen(buf));
 864
 865     rtsp_read_reply(s, reply, content_ptr, 0);
 866 }
 867
 868
 869 /* close and free RTSP streams */
 870 static void rtsp_close_streams(RTSPState *rt)
 871 {
 872     int i;
 873     RTSPStream *rtsp_st;
 874
 875     for(i=0;i<rt->nb_rtsp_streams;i++) {
 876         rtsp_st = rt->rtsp_streams[i];
 877         if (rtsp_st) {
 878             if (rtsp_st->transport_priv) {
 879                 if (rt->transport == RTSP_TRANSPORT_RDT)
 880                     ff_rdt_parse_close(rtsp_st->transport_priv);
 881                 else
 882                     rtp_parse_close(rtsp_st->transport_priv);
 883             }
 884             if (rtsp_st->rtp_handle)
 885                 url_close(rtsp_st->rtp_handle);
 886             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 887                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 888         }
 889     }
 890     av_free(rt->rtsp_streams);
 891     if (rt->asf_ctx) {
 892         av_close_input_stream (rt->asf_ctx);
 893         rt->asf_ctx = NULL;
 894     }
 895 }
 896
 897 static int
 898 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 899 {
 900     RTSPState *rt = s->priv_data;
 901     AVStream *st = NULL;
 902
 903     /* open the RTP context */
 904     if (rtsp_st->stream_index >= 0)
 905         st = s->streams[rtsp_st->stream_index];
 906     if (!st)
 907         s->ctx_flags |= AVFMTCTX_NOHEADER;
 908
 909     if (rt->transport == RTSP_TRANSPORT_RDT)
 910         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 911                                             rtsp_st->dynamic_protocol_context,
 912                                             rtsp_st->dynamic_handler);
 913     else
 914         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 915                                          rtsp_st->sdp_payload_type,
 916                                          &rtsp_st->rtp_payload_data);
 917
 918     if (!rtsp_st->transport_priv) {
 919          return AVERROR(ENOMEM);
 920     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 921         if(rtsp_st->dynamic_handler) {
 922             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 923                                            rtsp_st->dynamic_protocol_context,
 924                                            rtsp_st->dynamic_handler);
 925         }
 926     }
 927
 928     return 0;
 929 }
 930
 931 /**
 932  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 933  */
 934 static int
 935 make_setup_request (AVFormatContext *s, const char *host, int port,
 936                     int lower_transport, const char *real_challenge)
 937 {
 938     RTSPState *rt = s->priv_data;
 939     int rtx, j, i, err, interleave = 0;
 940     RTSPStream *rtsp_st;
 941     RTSPMessageHeader reply1, *reply = &reply1;
 942     char cmd[2048];
 943     const char *trans_pref;
 944
 945     if (rt->transport == RTSP_TRANSPORT_RDT)
 946         trans_pref = "x-pn-tng";
 947     else
 948         trans_pref = "RTP/AVP";
 949
 950     /* for each stream, make the setup request */
 951     /* XXX: we assume the same server is used for the control of each
 952        RTSP stream */
 953
 954     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 955         char transport[2048];
 956
 957         /**
 958          * WMS serves all UDP data over a single connection, the RTX, which
 959          * isn't necessarily the first in the SDP but has to be the first
 960          * to be set up, else the second/third SETUP will fail with a 461.
 961          */
 962         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 963              rt->server_type == RTSP_SERVER_WMS) {
 964             if (i == 0) {
 965                 /* rtx first */
 966                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
 967                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
 968                     if (len >= 4 &&
 969                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
 970                         break;
 971                 }
 972                 if (rtx == rt->nb_rtsp_streams)
 973                     return -1; /* no RTX found */
 974                 rtsp_st = rt->rtsp_streams[rtx];
 975             } else
 976                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
 977         } else
 978             rtsp_st = rt->rtsp_streams[i];
 979
 980         /* RTP/UDP */
 981         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 982             char buf[256];
 983
 984             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
 985                 port = reply->transports[0].client_port_min;
 986                 goto have_port;
 987             }
 988
 989             /* first try in specified port range */
 990             if (RTSP_RTP_PORT_MIN != 0) {
 991                 while(j <= RTSP_RTP_PORT_MAX) {
 992                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 993                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 994                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 995                         goto rtp_opened;
 996                     }
 997                 }
 998             }
 999
1000 /*            then try on any port
1001 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1002 **                err = AVERROR_INVALIDDATA;
1003 **                goto fail;
1004 **            }
1005 */
1006
1007         rtp_opened:
1008             port = rtp_get_local_port(rtsp_st->rtp_handle);
1009         have_port:
1010             snprintf(transport, sizeof(transport) - 1,
1011                      "%s/UDP;", trans_pref);
1012             if (rt->server_type != RTSP_SERVER_REAL)
1013                 av_strlcat(transport, "unicast;", sizeof(transport));
1014             av_strlcatf(transport, sizeof(transport),
1015                      "client_port=%d", port);
1016             if (rt->transport == RTSP_TRANSPORT_RTP &&
1017                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1018                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1019         }
1020
1021         /* RTP/TCP */
1022         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1023             /** For WMS streams, the application streams are only used for
1024              * UDP. When trying to set it up for TCP streams, the server
1025              * will return an error. Therefore, we skip those streams. */
1026             if (rt->server_type == RTSP_SERVER_WMS &&
1027                 s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
1028                 continue;
1029             snprintf(transport, sizeof(transport) - 1,
1030                      "%s/TCP;", trans_pref);
1031             if (rt->server_type == RTSP_SERVER_WMS)
1032                 av_strlcat(transport, "unicast;", sizeof(transport));
1033             av_strlcatf(transport, sizeof(transport),
1034                         "interleaved=%d-%d",
1035                         interleave, interleave + 1);
1036             interleave += 2;
1037         }
1038
1039         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1040             snprintf(transport, sizeof(transport) - 1,
1041                      "%s/UDP;multicast", trans_pref);
1042         }
1043         if (rt->server_type == RTSP_SERVER_REAL ||
1044             rt->server_type == RTSP_SERVER_WMS)
1045             av_strlcat(transport, ";mode=play", sizeof(transport));
1046         snprintf(cmd, sizeof(cmd),
1047                  "SETUP %s RTSP/1.0\r\n"
1048                  "Transport: %s\r\n",
1049                  rtsp_st->control_url, transport);
1050         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1051             char real_res[41], real_csum[9];
1052             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1053                                               real_challenge);
1054             av_strlcatf(cmd, sizeof(cmd),
1055                         "If-Match: %s\r\n"
1056                         "RealChallenge2: %s, sd=%s\r\n",
1057                         rt->session_id, real_res, real_csum);
1058         }
1059         rtsp_send_cmd(s, cmd, reply, NULL);
1060         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1061             err = 1;
1062             goto fail;
1063         } else if (reply->status_code != RTSP_STATUS_OK ||
1064                    reply->nb_transports != 1) {
1065             err = AVERROR_INVALIDDATA;
1066             goto fail;
1067         }
1068
1069         /* XXX: same protocol for all streams is required */
1070         if (i > 0) {
1071             if (reply->transports[0].lower_transport != rt->lower_transport ||
1072                 reply->transports[0].transport != rt->transport) {
1073                 err = AVERROR_INVALIDDATA;
1074                 goto fail;
1075             }
1076         } else {
1077             rt->lower_transport = reply->transports[0].lower_transport;
1078             rt->transport = reply->transports[0].transport;
1079         }
1080
1081         /* close RTP connection if not choosen */
1082         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1083             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1084             url_close(rtsp_st->rtp_handle);
1085             rtsp_st->rtp_handle = NULL;
1086         }
1087
1088         switch(reply->transports[0].lower_transport) {
1089         case RTSP_LOWER_TRANSPORT_TCP:
1090             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1091             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1092             break;
1093
1094         case RTSP_LOWER_TRANSPORT_UDP:
1095             {
1096                 char url[1024];
1097
1098                 /* XXX: also use address if specified */
1099                 snprintf(url, sizeof(url), "rtp://%s:%d",
1100                          host, reply->transports[0].server_port_min);
1101                 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1102                     rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1103                     err = AVERROR_INVALIDDATA;
1104                     goto fail;
1105                 }
1106             }
1107             break;
1108         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1109             {
1110                 char url[1024];
1111                 struct in_addr in;
1112
1113                 in.s_addr = htonl(reply->transports[0].destination);
1114                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1115                          inet_ntoa(in),
1116                          reply->transports[0].port_min,
1117                          reply->transports[0].ttl);
1118                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1119                     err = AVERROR_INVALIDDATA;
1120                     goto fail;
1121                 }
1122             }
1123             break;
1124         }
1125
1126         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1127             goto fail;
1128     }
1129
1130     if (rt->server_type == RTSP_SERVER_REAL)
1131         rt->need_subscription = 1;
1132
1133     return 0;
1134
1135 fail:
1136     for (i=0; i<rt->nb_rtsp_streams; i++) {
1137         if (rt->rtsp_streams[i]->rtp_handle) {
1138             url_close(rt->rtsp_streams[i]->rtp_handle);
1139             rt->rtsp_streams[i]->rtp_handle = NULL;
1140         }
1141     }
1142     return err;
1143 }
1144
1145 static int rtsp_read_header(AVFormatContext *s,
1146                             AVFormatParameters *ap)
1147 {
1148     RTSPState *rt = s->priv_data;
1149     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1150     URLContext *rtsp_hd;
1151     int port, ret, err;
1152     RTSPMessageHeader reply1, *reply = &reply1;
1153     unsigned char *content = NULL;
1154     int lower_transport_mask = 0;
1155     char real_challenge[64];
1156
1157     /* extract hostname and port */
1158     url_split(NULL, 0, NULL, 0,
1159               host, sizeof(host), &port, path, sizeof(path), s->filename);
1160     if (port < 0)
1161         port = RTSP_DEFAULT_PORT;
1162
1163     /* search for options */
1164     option_list = strchr(path, '?');
1165     if (option_list) {
1166         /* remove the options from the path */
1167         *option_list++ = 0;
1168         while(option_list) {
1169             /* move the option pointer */
1170             option = option_list;
1171             option_list = strchr(option_list, '&');
1172             if (option_list)
1173                 *(option_list++) = 0;
1174             /* handle the options */
1175             if (strcmp(option, "udp") == 0)
1176                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1177             else if (strcmp(option, "multicast") == 0)
1178                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1179             else if (strcmp(option, "tcp") == 0)
1180                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1181         }
1182     }
1183
1184     if (!lower_transport_mask)
1185         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1186
1187     /* open the tcp connexion */
1188     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1189     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1190         return AVERROR(EIO);
1191     rt->rtsp_hd = rtsp_hd;
1192     rt->seq = 0;
1193
1194     /* request options supported by the server; this also detects server type */
1195     for (rt->server_type = RTSP_SERVER_RTP;;) {
1196         snprintf(cmd, sizeof(cmd),
1197                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1198         if (rt->server_type == RTSP_SERVER_REAL)
1199             av_strlcat(cmd,
1200                        /**
1201                         * The following entries are required for proper
1202                         * streaming from a Realmedia server. They are
1203                         * interdependent in some way although we currently
1204                         * don't quite understand how. Values were copied
1205                         * from mplayer SVN r23589.
1206                         * @param CompanyID is a 16-byte ID in base64
1207                         * @param ClientChallenge is a 16-byte ID in hex
1208                         */
1209                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1210                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1211                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1212                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1213                        sizeof(cmd));
1214         rtsp_send_cmd(s, cmd, reply, NULL);
1215         if (reply->status_code != RTSP_STATUS_OK) {
1216             err = AVERROR_INVALIDDATA;
1217             goto fail;
1218         }
1219
1220         /* detect server type if not standard-compliant RTP */
1221         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1222             rt->server_type = RTSP_SERVER_REAL;
1223             continue;
1224         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1225             rt->server_type = RTSP_SERVER_WMS;
1226         } else if (rt->server_type == RTSP_SERVER_REAL) {
1227             strcpy(real_challenge, reply->real_challenge);
1228         }
1229         break;
1230     }
1231
1232     /* describe the stream */
1233     snprintf(cmd, sizeof(cmd),
1234              "DESCRIBE %s RTSP/1.0\r\n"
1235              "Accept: application/sdp\r\n",
1236              s->filename);
1237     if (rt->server_type == RTSP_SERVER_REAL) {
1238         /**
1239          * The Require: attribute is needed for proper streaming from
1240          * Realmedia servers.
1241          */
1242         av_strlcat(cmd,
1243                    "Require: com.real.retain-entity-for-setup\r\n",
1244                    sizeof(cmd));
1245     }
1246     rtsp_send_cmd(s, cmd, reply, &content);
1247     if (!content) {
1248         err = AVERROR_INVALIDDATA;
1249         goto fail;
1250     }
1251     if (reply->status_code != RTSP_STATUS_OK) {
1252         err = AVERROR_INVALIDDATA;
1253         goto fail;
1254     }
1255
1256     /* now we got the SDP description, we parse it */
1257     ret = sdp_parse(s, (const char *)content);
1258     av_freep(&content);
1259     if (ret < 0) {
1260         err = AVERROR_INVALIDDATA;
1261         goto fail;
1262     }
1263
1264     do {
1265         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1266
1267         err = make_setup_request(s, host, port, lower_transport,
1268                                  rt->server_type == RTSP_SERVER_REAL ?
1269                                      real_challenge : NULL);
1270         if (err < 0)
1271             goto fail;
1272         lower_transport_mask &= ~(1 << lower_transport);
1273         if (lower_transport_mask == 0 && err == 1) {
1274             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1275             goto fail;
1276         }
1277     } while (err);
1278
1279     rt->state = RTSP_STATE_IDLE;
1280     rt->seek_timestamp = 0; /* default is to start stream at position
1281                                zero */
1282     if (ap->initial_pause) {
1283         /* do not start immediately */
1284     } else {
1285         if (rtsp_read_play(s) < 0) {
1286             err = AVERROR_INVALIDDATA;
1287             goto fail;
1288         }
1289     }
1290     return 0;
1291  fail:
1292     rtsp_close_streams(rt);
1293     av_freep(&content);
1294     url_close(rt->rtsp_hd);
1295     return err;
1296 }
1297
1298 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1299                            uint8_t *buf, int buf_size)
1300 {
1301     RTSPState *rt = s->priv_data;
1302     int id, len, i, ret;
1303     RTSPStream *rtsp_st;
1304
1305 #ifdef DEBUG_RTP_TCP
1306     printf("tcp_read_packet:\n");
1307 #endif
1308  redo:
1309     for(;;) {
1310         RTSPMessageHeader reply;
1311
1312         ret = rtsp_read_reply(s, &reply, NULL, 1);
1313         if (ret == -1)
1314             return -1;
1315         if (ret == 1) /* received '$' */
1316             break;
1317         /* XXX: parse message */
1318     }
1319     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1320     if (ret != 3)
1321         return -1;
1322     id = buf[0];
1323     len = AV_RB16(buf + 1);
1324 #ifdef DEBUG_RTP_TCP
1325     printf("id=%d len=%d\n", id, len);
1326 #endif
1327     if (len > buf_size || len < 12)
1328         goto redo;
1329     /* get the data */
1330     ret = url_readbuf(rt->rtsp_hd, buf, len);
1331     if (ret != len)
1332         return -1;
1333     if (rt->transport == RTSP_TRANSPORT_RDT &&
1334         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1335         return -1;
1336
1337     /* find the matching stream */
1338     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1339         rtsp_st = rt->rtsp_streams[i];
1340         if (id >= rtsp_st->interleaved_min &&
1341             id <= rtsp_st->interleaved_max)
1342             goto found;
1343     }
1344     goto redo;
1345  found:
1346     *prtsp_st = rtsp_st;
1347     return len;
1348 }
1349
1350 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1351                            uint8_t *buf, int buf_size)
1352 {
1353     RTSPState *rt = s->priv_data;
1354     RTSPStream *rtsp_st;
1355     fd_set rfds;
1356     int fd, fd_max, n, i, ret, tcp_fd;
1357     struct timeval tv;
1358
1359     for(;;) {
1360         if (url_interrupt_cb())
1361             return AVERROR(EINTR);
1362         FD_ZERO(&rfds);
1363         tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1364         FD_SET(tcp_fd, &rfds);
1365         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1366             rtsp_st = rt->rtsp_streams[i];
1367             if (rtsp_st->rtp_handle) {
1368                 /* currently, we cannot probe RTCP handle because of
1369                  * blocking restrictions */
1370                 fd = url_get_file_handle(rtsp_st->rtp_handle);
1371                 if (fd > fd_max)
1372                     fd_max = fd;
1373                 FD_SET(fd, &rfds);
1374             }
1375         }
1376         tv.tv_sec = 0;
1377         tv.tv_usec = 100 * 1000;
1378         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1379         if (n > 0) {
1380             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1381                 rtsp_st = rt->rtsp_streams[i];
1382                 if (rtsp_st->rtp_handle) {
1383                     fd = url_get_file_handle(rtsp_st->rtp_handle);
1384                     if (FD_ISSET(fd, &rfds)) {
1385                         ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1386                         if (ret > 0) {
1387                             *prtsp_st = rtsp_st;
1388                             return ret;
1389                         }
1390                     }
1391                 }
1392             }
1393             if (FD_ISSET(tcp_fd, &rfds)) {
1394                 RTSPMessageHeader reply;
1395
1396                 rtsp_read_reply(s, &reply, NULL, 0);
1397                 /* XXX: parse message */
1398             }
1399         }
1400     }
1401 }
1402
1403 static int rtsp_read_packet(AVFormatContext *s,
1404                             AVPacket *pkt)
1405 {
1406     RTSPState *rt = s->priv_data;
1407     RTSPStream *rtsp_st;
1408     int ret, len;
1409     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1410
1411     if (rt->server_type == RTSP_SERVER_REAL) {
1412         int i;
1413         RTSPMessageHeader reply1, *reply = &reply1;
1414         enum AVDiscard cache[MAX_STREAMS];
1415         char cmd[1024];
1416
1417         for (i = 0; i < s->nb_streams; i++)
1418             cache[i] = s->streams[i]->discard;
1419
1420         if (!rt->need_subscription) {
1421             if (memcmp (cache, rt->real_setup_cache,
1422                         sizeof(enum AVDiscard) * s->nb_streams)) {
1423                 av_strlcatf(cmd, sizeof(cmd),
1424                             "SET_PARAMETER %s RTSP/1.0\r\n"
1425                             "Unsubscribe: %s\r\n",
1426                             s->filename, rt->last_subscription);
1427                 rtsp_send_cmd(s, cmd, reply, NULL);
1428                 if (reply->status_code != RTSP_STATUS_OK)
1429                     return AVERROR_INVALIDDATA;
1430                 rt->need_subscription = 1;
1431             }
1432         }
1433
1434         if (rt->need_subscription) {
1435             int r, rule_nr, first = 1;
1436
1437             memcpy(rt->real_setup_cache, cache,
1438                    sizeof(enum AVDiscard) * s->nb_streams);
1439             rt->last_subscription[0] = 0;
1440
1441             snprintf(cmd, sizeof(cmd),
1442                      "SET_PARAMETER %s RTSP/1.0\r\n"
1443                      "Subscribe: ",
1444                      s->filename);
1445             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1446                 rule_nr = 0;
1447                 for (r = 0; r < s->nb_streams; r++) {
1448                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1449                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1450                             if (!first)
1451                                 av_strlcat(rt->last_subscription, ",",
1452                                            sizeof(rt->last_subscription));
1453                             ff_rdt_subscribe_rule(
1454                                 rt->last_subscription,
1455                                 sizeof(rt->last_subscription), i, rule_nr);
1456                             first = 0;
1457                         }
1458                         rule_nr++;
1459                     }
1460                 }
1461             }
1462             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1463             rtsp_send_cmd(s, cmd, reply, NULL);
1464             if (reply->status_code != RTSP_STATUS_OK)
1465                 return AVERROR_INVALIDDATA;
1466             rt->need_subscription = 0;
1467
1468             if (rt->state == RTSP_STATE_PLAYING)
1469                 rtsp_read_play (s);
1470         }
1471     }
1472
1473     /* get next frames from the same RTP packet */
1474     if (rt->cur_transport_priv) {
1475         if (rt->transport == RTSP_TRANSPORT_RDT)
1476             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1477         else
1478             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1479         if (ret == 0) {
1480             rt->cur_transport_priv = NULL;
1481             return 0;
1482         } else if (ret == 1) {
1483             return 0;
1484         } else {
1485             rt->cur_transport_priv = NULL;
1486         }
1487     }
1488
1489     /* read next RTP packet */
1490  redo:
1491     switch(rt->lower_transport) {
1492     default:
1493     case RTSP_LOWER_TRANSPORT_TCP:
1494         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1495         break;
1496     case RTSP_LOWER_TRANSPORT_UDP:
1497     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1498         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1499         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1500             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1501         break;
1502     }
1503     if (len < 0)
1504         return len;
1505     if (rt->transport == RTSP_TRANSPORT_RDT)
1506         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1507     else
1508         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1509     if (ret < 0)
1510         goto redo;
1511     if (ret == 1) {
1512         /* more packets may follow, so we save the RTP context */
1513         rt->cur_transport_priv = rtsp_st->transport_priv;
1514     }
1515     return 0;
1516 }
1517
1518 static int rtsp_read_play(AVFormatContext *s)
1519 {
1520     RTSPState *rt = s->priv_data;
1521     RTSPMessageHeader reply1, *reply = &reply1;
1522     char cmd[1024];
1523
1524     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1525
1526     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1527         if (rt->state == RTSP_STATE_PAUSED) {
1528             snprintf(cmd, sizeof(cmd),
1529                      "PLAY %s RTSP/1.0\r\n",
1530                      s->filename);
1531         } else {
1532             snprintf(cmd, sizeof(cmd),
1533                      "PLAY %s RTSP/1.0\r\n"
1534                      "Range: npt=%0.3f-\r\n",
1535                      s->filename,
1536                      (double)rt->seek_timestamp / AV_TIME_BASE);
1537         }
1538         rtsp_send_cmd(s, cmd, reply, NULL);
1539         if (reply->status_code != RTSP_STATUS_OK) {
1540             return -1;
1541         }
1542     }
1543     rt->state = RTSP_STATE_PLAYING;
1544     return 0;
1545 }
1546
1547 /* pause the stream */
1548 static int rtsp_read_pause(AVFormatContext *s)
1549 {
1550     RTSPState *rt = s->priv_data;
1551     RTSPMessageHeader reply1, *reply = &reply1;
1552     char cmd[1024];
1553
1554     rt = s->priv_data;
1555
1556     if (rt->state != RTSP_STATE_PLAYING)
1557         return 0;
1558     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1559         snprintf(cmd, sizeof(cmd),
1560                  "PAUSE %s RTSP/1.0\r\n",
1561                  s->filename);
1562         rtsp_send_cmd(s, cmd, reply, NULL);
1563         if (reply->status_code != RTSP_STATUS_OK) {
1564             return -1;
1565         }
1566     }
1567     rt->state = RTSP_STATE_PAUSED;
1568     return 0;
1569 }
1570
1571 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1572                           int64_t timestamp, int flags)
1573 {
1574     RTSPState *rt = s->priv_data;
1575
1576     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1577     switch(rt->state) {
1578     default:
1579     case RTSP_STATE_IDLE:
1580         break;
1581     case RTSP_STATE_PLAYING:
1582         if (rtsp_read_play(s) != 0)
1583             return -1;
1584         break;
1585     case RTSP_STATE_PAUSED:
1586         rt->state = RTSP_STATE_IDLE;
1587         break;
1588     }
1589     return 0;
1590 }
1591
1592 static int rtsp_read_close(AVFormatContext *s)
1593 {
1594     RTSPState *rt = s->priv_data;
1595     RTSPMessageHeader reply1, *reply = &reply1;
1596     char cmd[1024];
1597
1598 #if 0
1599     /* NOTE: it is valid to flush the buffer here */
1600     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1601         url_fclose(&rt->rtsp_gb);
1602     }
1603 #endif
1604     snprintf(cmd, sizeof(cmd),
1605              "TEARDOWN %s RTSP/1.0\r\n",
1606              s->filename);
1607     rtsp_send_cmd(s, cmd, reply, NULL);
1608
1609     rtsp_close_streams(rt);
1610     url_close(rt->rtsp_hd);
1611     return 0;
1612 }
1613
1614 #if CONFIG_RTSP_DEMUXER
1615 AVInputFormat rtsp_demuxer = {
1616     "rtsp",
1617     NULL_IF_CONFIG_SMALL("RTSP input format"),
1618     sizeof(RTSPState),
1619     rtsp_probe,
1620     rtsp_read_header,
1621     rtsp_read_packet,
1622     rtsp_read_close,
1623     rtsp_read_seek,
1624     .flags = AVFMT_NOFILE,
1625     .read_play = rtsp_read_play,
1626     .read_pause = rtsp_read_pause,
1627 };
1628 #endif
1629
1630 static int sdp_probe(AVProbeData *p1)
1631 {
1632     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1633
1634     /* we look for a line beginning "c=IN IP4" */
1635     while (p < p_end && *p != '\0') {
1636         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1637             return AVPROBE_SCORE_MAX / 2;
1638
1639         while(p < p_end - 1 && *p != '\n') p++;
1640         if (++p >= p_end)
1641             break;
1642         if (*p == '\r')
1643             p++;
1644     }
1645     return 0;
1646 }
1647
1648 #define SDP_MAX_SIZE 8192
1649
1650 static int sdp_read_header(AVFormatContext *s,
1651                            AVFormatParameters *ap)
1652 {
1653     RTSPState *rt = s->priv_data;
1654     RTSPStream *rtsp_st;
1655     int size, i, err;
1656     char *content;
1657     char url[1024];
1658
1659     /* read the whole sdp file */
1660     /* XXX: better loading */
1661     content = av_malloc(SDP_MAX_SIZE);
1662     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1663     if (size <= 0) {
1664         av_free(content);
1665         return AVERROR_INVALIDDATA;
1666     }
1667     content[size] ='\0';
1668
1669     sdp_parse(s, content);
1670     av_free(content);
1671
1672     /* open each RTP stream */
1673     for(i=0;i<rt->nb_rtsp_streams;i++) {
1674         rtsp_st = rt->rtsp_streams[i];
1675
1676         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1677                  inet_ntoa(rtsp_st->sdp_ip),
1678                  rtsp_st->sdp_port,
1679                  rtsp_st->sdp_port,
1680                  rtsp_st->sdp_ttl);
1681         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1682             err = AVERROR_INVALIDDATA;
1683             goto fail;
1684         }
1685         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1686             goto fail;
1687     }
1688     return 0;
1689  fail:
1690     rtsp_close_streams(rt);
1691     return err;
1692 }
1693
1694 static int sdp_read_packet(AVFormatContext *s,
1695                             AVPacket *pkt)
1696 {
1697     return rtsp_read_packet(s, pkt);
1698 }
1699
1700 static int sdp_read_close(AVFormatContext *s)
1701 {
1702     RTSPState *rt = s->priv_data;
1703     rtsp_close_streams(rt);
1704     return 0;
1705 }
1706
1707 #if CONFIG_SDP_DEMUXER
1708 AVInputFormat sdp_demuxer = {
1709     "sdp",
1710     NULL_IF_CONFIG_SMALL("SDP"),
1711     sizeof(RTSPState),
1712     sdp_probe,
1713     sdp_read_header,
1714     sdp_read_packet,
1715     sdp_read_close,
1716 };
1717 #endif
1718
1719 #if CONFIG_REDIR_DEMUXER
1720 /* dummy redirector format (used directly in av_open_input_file now) */
1721 static int redir_probe(AVProbeData *pd)
1722 {
1723     const char *p;
1724     p = pd->buf;
1725     while (redir_isspace(*p))
1726         p++;
1727     if (av_strstart(p, "http://", NULL) ||
1728         av_strstart(p, "rtsp://", NULL))
1729         return AVPROBE_SCORE_MAX;
1730     return 0;
1731 }
1732
1733 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1734 {
1735     char buf[4096], *q;
1736     int c;
1737     AVFormatContext *ic = NULL;
1738     ByteIOContext *f = s->pb;
1739
1740     /* parse each URL and try to open it */
1741     c = url_fgetc(f);
1742     while (c != URL_EOF) {
1743         /* skip spaces */
1744         for(;;) {
1745             if (!redir_isspace(c))
1746                 break;
1747             c = url_fgetc(f);
1748         }
1749         if (c == URL_EOF)
1750             break;
1751         /* record url */
1752         q = buf;
1753         for(;;) {
1754             if (c == URL_EOF || redir_isspace(c))
1755                 break;
1756             if ((q - buf) < sizeof(buf) - 1)
1757                 *q++ = c;
1758             c = url_fgetc(f);
1759         }
1760         *q = '\0';
1761         //printf("URL='%s'\n", buf);
1762         /* try to open the media file */
1763         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1764             break;
1765     }
1766     if (!ic)
1767         return AVERROR(EIO);
1768
1769     *s = *ic;
1770     url_fclose(f);
1771
1772     return 0;
1773 }
1774
1775 AVInputFormat redir_demuxer = {
1776     "redir",
1777     NULL_IF_CONFIG_SMALL("Redirector format"),
1778     0,
1779     redir_probe,
1780     redir_read_header,
1781     NULL,
1782     NULL,
1783 };
1784 #endif