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