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 {
 396             s1->skip_media = 1;
 397             return;
 398         }
 399         rtsp_st = av_mallocz(sizeof(RTSPStream));
 400         if (!rtsp_st)
 401             return;
 402         rtsp_st->stream_index = -1;
 403         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 404
 405         rtsp_st->sdp_ip = s1->default_ip;
 406         rtsp_st->sdp_ttl = s1->default_ttl;
 407
 408         get_word(buf1, sizeof(buf1), &p); /* port */
 409         rtsp_st->sdp_port = atoi(buf1);
 410
 411         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 412
 413         /* XXX: handle list of formats */
 414         get_word(buf1, sizeof(buf1), &p); /* format list */
 415         rtsp_st->sdp_payload_type = atoi(buf1);
 416
 417         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 418             /* no corresponding stream */
 419         } else {
 420             st = av_new_stream(s, 0);
 421             if (!st)
 422                 return;
 423             st->priv_data = rtsp_st;
 424             rtsp_st->stream_index = st->index;
 425             st->codec->codec_type = codec_type;
 426             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 427                 /* if standard payload type, we can find the codec right now */
 428                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 429             }
 430         }
 431         /* put a default control url */
 432         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 433         break;
 434     case 'a':
 435         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 436             char proto[32];
 437             /* get the control url */
 438             st = s->streams[s->nb_streams - 1];
 439             rtsp_st = st->priv_data;
 440
 441             /* XXX: may need to add full url resolution */
 442             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 443             if (proto[0] == '\0') {
 444                 /* relative control URL */
 445                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 446                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 447             } else {
 448                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 449             }
 450         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 451             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 452             get_word(buf1, sizeof(buf1), &p);
 453             payload_type = atoi(buf1);
 454             st = s->streams[s->nb_streams - 1];
 455             rtsp_st = st->priv_data;
 456             sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 457         } else if (av_strstart(p, "fmtp:", &p)) {
 458             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 459             get_word(buf1, sizeof(buf1), &p);
 460             payload_type = atoi(buf1);
 461             for(i = 0; i < s->nb_streams;i++) {
 462                 st = s->streams[i];
 463                 rtsp_st = st->priv_data;
 464                 if (rtsp_st->sdp_payload_type == payload_type) {
 465                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 466                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
 467                             sdp_parse_fmtp(st, p);
 468                         }
 469                     } else {
 470                         sdp_parse_fmtp(st, p);
 471                     }
 472                 }
 473             }
 474         } else if(av_strstart(p, "framesize:", &p)) {
 475             // let dynamic protocol handlers have a stab at the line.
 476             get_word(buf1, sizeof(buf1), &p);
 477             payload_type = atoi(buf1);
 478             for(i = 0; i < s->nb_streams;i++) {
 479                 st = s->streams[i];
 480                 rtsp_st = st->priv_data;
 481                 if (rtsp_st->sdp_payload_type == payload_type) {
 482                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 483                         rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
 484                     }
 485                 }
 486             }
 487         } else if(av_strstart(p, "range:", &p)) {
 488             int64_t start, end;
 489
 490             // this is so that seeking on a streamed file can work.
 491             rtsp_parse_range_npt(p, &start, &end);
 492             s->start_time= start;
 493             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 494         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 495             if (atoi(p) == 1)
 496                 rt->transport = RTSP_TRANSPORT_RDT;
 497         } else if (s->nb_streams > 0) {
 498             if (rt->server_type == RTSP_SERVER_REAL)
 499                 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 500
 501             rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 502             if (rtsp_st->dynamic_handler &&
 503                 rtsp_st->dynamic_handler->parse_sdp_a_line)
 504                 rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
 505                     rtsp_st->dynamic_protocol_context, buf);
 506         }
 507         break;
 508     }
 509 }
 510
 511 static int sdp_parse(AVFormatContext *s, const char *content)
 512 {
 513     const char *p;
 514     int letter;
 515     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 516      * contain long SDP lines containing complete ASF Headers (several
 517      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 518      * "rulebooks" describing their properties. Therefore, the SDP line
 519      * buffer is large. */
 520     char buf[8192], *q;
 521     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 522
 523     memset(s1, 0, sizeof(SDPParseState));
 524     p = content;
 525     for(;;) {
 526         skip_spaces(&p);
 527         letter = *p;
 528         if (letter == '\0')
 529             break;
 530         p++;
 531         if (*p != '=')
 532             goto next_line;
 533         p++;
 534         /* get the content */
 535         q = buf;
 536         while (*p != '\n' && *p != '\r' && *p != '\0') {
 537             if ((q - buf) < sizeof(buf) - 1)
 538                 *q++ = *p;
 539             p++;
 540         }
 541         *q = '\0';
 542         sdp_parse_line(s, s1, letter, buf);
 543     next_line:
 544         while (*p != '\n' && *p != '\0')
 545             p++;
 546         if (*p == '\n')
 547             p++;
 548     }
 549     return 0;
 550 }
 551
 552 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 553 {
 554     const char *p;
 555     int v;
 556
 557     p = *pp;
 558     skip_spaces(&p);
 559     v = strtol(p, (char **)&p, 10);
 560     if (*p == '-') {
 561         p++;
 562         *min_ptr = v;
 563         v = strtol(p, (char **)&p, 10);
 564         *max_ptr = v;
 565     } else {
 566         *min_ptr = v;
 567         *max_ptr = v;
 568     }
 569     *pp = p;
 570 }
 571
 572 /* XXX: only one transport specification is parsed */
 573 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 574 {
 575     char transport_protocol[16];
 576     char profile[16];
 577     char lower_transport[16];
 578     char parameter[16];
 579     RTSPTransportField *th;
 580     char buf[256];
 581
 582     reply->nb_transports = 0;
 583
 584     for(;;) {
 585         skip_spaces(&p);
 586         if (*p == '\0')
 587             break;
 588
 589         th = &reply->transports[reply->nb_transports];
 590
 591         get_word_sep(transport_protocol, sizeof(transport_protocol),
 592                      "/", &p);
 593         if (*p == '/')
 594             p++;
 595         if (!strcasecmp (transport_protocol, "rtp")) {
 596             get_word_sep(profile, sizeof(profile), "/;,", &p);
 597             lower_transport[0] = '\0';
 598             /* rtp/avp/<protocol> */
 599             if (*p == '/') {
 600                 p++;
 601                 get_word_sep(lower_transport, sizeof(lower_transport),
 602                              ";,", &p);
 603             }
 604             th->transport = RTSP_TRANSPORT_RTP;
 605         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 606                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 607             /* x-pn-tng/<protocol> */
 608             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 609             profile[0] = '\0';
 610             th->transport = RTSP_TRANSPORT_RDT;
 611         }
 612         if (!strcasecmp(lower_transport, "TCP"))
 613             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 614         else
 615             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 616
 617         if (*p == ';')
 618             p++;
 619         /* get each parameter */
 620         while (*p != '\0' && *p != ',') {
 621             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 622             if (!strcmp(parameter, "port")) {
 623                 if (*p == '=') {
 624                     p++;
 625                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 626                 }
 627             } else if (!strcmp(parameter, "client_port")) {
 628                 if (*p == '=') {
 629                     p++;
 630                     rtsp_parse_range(&th->client_port_min,
 631                                      &th->client_port_max, &p);
 632                 }
 633             } else if (!strcmp(parameter, "server_port")) {
 634                 if (*p == '=') {
 635                     p++;
 636                     rtsp_parse_range(&th->server_port_min,
 637                                      &th->server_port_max, &p);
 638                 }
 639             } else if (!strcmp(parameter, "interleaved")) {
 640                 if (*p == '=') {
 641                     p++;
 642                     rtsp_parse_range(&th->interleaved_min,
 643                                      &th->interleaved_max, &p);
 644                 }
 645             } else if (!strcmp(parameter, "multicast")) {
 646                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 647                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 648             } else if (!strcmp(parameter, "ttl")) {
 649                 if (*p == '=') {
 650                     p++;
 651                     th->ttl = strtol(p, (char **)&p, 10);
 652                 }
 653             } else if (!strcmp(parameter, "destination")) {
 654                 struct in_addr ipaddr;
 655
 656                 if (*p == '=') {
 657                     p++;
 658                     get_word_sep(buf, sizeof(buf), ";,", &p);
 659                     if (inet_aton(buf, &ipaddr))
 660                         th->destination = ntohl(ipaddr.s_addr);
 661                 }
 662             }
 663             while (*p != ';' && *p != '\0' && *p != ',')
 664                 p++;
 665             if (*p == ';')
 666                 p++;
 667         }
 668         if (*p == ',')
 669             p++;
 670
 671         reply->nb_transports++;
 672     }
 673 }
 674
 675 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 676 {
 677     const char *p;
 678
 679     /* NOTE: we do case independent match for broken servers */
 680     p = buf;
 681     if (av_stristart(p, "Session:", &p)) {
 682         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 683     } else if (av_stristart(p, "Content-Length:", &p)) {
 684         reply->content_length = strtol(p, NULL, 10);
 685     } else if (av_stristart(p, "Transport:", &p)) {
 686         rtsp_parse_transport(reply, p);
 687     } else if (av_stristart(p, "CSeq:", &p)) {
 688         reply->seq = strtol(p, NULL, 10);
 689     } else if (av_stristart(p, "Range:", &p)) {
 690         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 691     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 692         skip_spaces(&p);
 693         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 694     } else if (av_stristart(p, "Server:", &p)) {
 695         skip_spaces(&p);
 696         av_strlcpy(reply->server, p, sizeof(reply->server));
 697     }
 698 }
 699
 700 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 701 {
 702     int ret, len;
 703
 704     len = 0;
 705     while (len < size) {
 706         ret = url_read(h, buf+len, size-len);
 707         if (ret < 1)
 708             return ret;
 709         len += ret;
 710     }
 711     return len;
 712 }
 713
 714 /* skip a RTP/TCP interleaved packet */
 715 static void rtsp_skip_packet(AVFormatContext *s)
 716 {
 717     RTSPState *rt = s->priv_data;
 718     int ret, len, len1;
 719     uint8_t buf[1024];
 720
 721     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 722     if (ret != 3)
 723         return;
 724     len = AV_RB16(buf + 1);
 725 #ifdef DEBUG
 726     printf("skipping RTP packet len=%d\n", len);
 727 #endif
 728     /* skip payload */
 729     while (len > 0) {
 730         len1 = len;
 731         if (len1 > sizeof(buf))
 732             len1 = sizeof(buf);
 733         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 734         if (ret != len1)
 735             return;
 736         len -= len1;
 737     }
 738 }
 739
 740 static void rtsp_send_cmd(AVFormatContext *s,
 741                           const char *cmd, RTSPHeader *reply,
 742                           unsigned char **content_ptr)
 743 {
 744     RTSPState *rt = s->priv_data;
 745     char buf[4096], buf1[1024], *q;
 746     unsigned char ch;
 747     const char *p;
 748     int content_length, line_count;
 749     unsigned char *content = NULL;
 750
 751     memset(reply, 0, sizeof(*reply));
 752
 753     rt->seq++;
 754     av_strlcpy(buf, cmd, sizeof(buf));
 755     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 756     av_strlcat(buf, buf1, sizeof(buf));
 757     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 758         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 759         av_strlcat(buf, buf1, sizeof(buf));
 760     }
 761     av_strlcat(buf, "\r\n", sizeof(buf));
 762 #ifdef DEBUG
 763     printf("Sending:\n%s--\n", buf);
 764 #endif
 765     url_write(rt->rtsp_hd, buf, strlen(buf));
 766
 767     /* parse reply (XXX: use buffers) */
 768     line_count = 0;
 769     rt->last_reply[0] = '\0';
 770     for(;;) {
 771         q = buf;
 772         for(;;) {
 773             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 774                 break;
 775             if (ch == '\n')
 776                 break;
 777             if (ch == '$') {
 778                 /* XXX: only parse it if first char on line ? */
 779                 rtsp_skip_packet(s);
 780             } else if (ch != '\r') {
 781                 if ((q - buf) < sizeof(buf) - 1)
 782                     *q++ = ch;
 783             }
 784         }
 785         *q = '\0';
 786 #ifdef DEBUG
 787         printf("line='%s'\n", buf);
 788 #endif
 789         /* test if last line */
 790         if (buf[0] == '\0')
 791             break;
 792         p = buf;
 793         if (line_count == 0) {
 794             /* get reply code */
 795             get_word(buf1, sizeof(buf1), &p);
 796             get_word(buf1, sizeof(buf1), &p);
 797             reply->status_code = atoi(buf1);
 798         } else {
 799             rtsp_parse_line(reply, p);
 800             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 801             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 802         }
 803         line_count++;
 804     }
 805
 806     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 807         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 808
 809     content_length = reply->content_length;
 810     if (content_length > 0) {
 811         /* leave some room for a trailing '\0' (useful for simple parsing) */
 812         content = av_malloc(content_length + 1);
 813         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 814         content[content_length] = '\0';
 815     }
 816     if (content_ptr)
 817         *content_ptr = content;
 818     else
 819         av_free(content);
 820 }
 821
 822
 823 /* close and free RTSP streams */
 824 static void rtsp_close_streams(RTSPState *rt)
 825 {
 826     int i;
 827     RTSPStream *rtsp_st;
 828
 829     for(i=0;i<rt->nb_rtsp_streams;i++) {
 830         rtsp_st = rt->rtsp_streams[i];
 831         if (rtsp_st) {
 832             if (rtsp_st->transport_priv) {
 833                 if (rt->transport == RTSP_TRANSPORT_RDT)
 834                     ff_rdt_parse_close(rtsp_st->transport_priv);
 835                 else
 836                     rtp_parse_close(rtsp_st->transport_priv);
 837             }
 838             if (rtsp_st->rtp_handle)
 839                 url_close(rtsp_st->rtp_handle);
 840             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 841                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 842         }
 843     }
 844     av_free(rt->rtsp_streams);
 845 }
 846
 847 static int
 848 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 849 {
 850     RTSPState *rt = s->priv_data;
 851     AVStream *st = NULL;
 852
 853     /* open the RTP context */
 854     if (rtsp_st->stream_index >= 0)
 855         st = s->streams[rtsp_st->stream_index];
 856     if (!st)
 857         s->ctx_flags |= AVFMTCTX_NOHEADER;
 858
 859     if (rt->transport == RTSP_TRANSPORT_RDT)
 860         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 861                                             rtsp_st->dynamic_protocol_context,
 862                                             rtsp_st->dynamic_handler);
 863     else
 864         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 865                                          rtsp_st->sdp_payload_type,
 866                                          &rtsp_st->rtp_payload_data);
 867
 868     if (!rtsp_st->transport_priv) {
 869          return AVERROR(ENOMEM);
 870     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 871         if(rtsp_st->dynamic_handler) {
 872             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 873                                            rtsp_st->dynamic_protocol_context,
 874                                            rtsp_st->dynamic_handler);
 875         }
 876     }
 877
 878     return 0;
 879 }
 880
 881 /**
 882  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 883  */
 884 static int
 885 make_setup_request (AVFormatContext *s, const char *host, int port,
 886                     int lower_transport, const char *real_challenge)
 887 {
 888     RTSPState *rt = s->priv_data;
 889     int j, i, err, interleave = 0;
 890     RTSPStream *rtsp_st;
 891     RTSPHeader reply1, *reply = &reply1;
 892     char cmd[2048];
 893     const char *trans_pref;
 894
 895     if (rt->transport == RTSP_TRANSPORT_RDT)
 896         trans_pref = "x-pn-tng";
 897     else
 898         trans_pref = "RTP/AVP";
 899
 900     /* for each stream, make the setup request */
 901     /* XXX: we assume the same server is used for the control of each
 902        RTSP stream */
 903
 904     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 905         char transport[2048];
 906
 907         rtsp_st = rt->rtsp_streams[i];
 908
 909         /* RTP/UDP */
 910         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 911             char buf[256];
 912
 913             /* first try in specified port range */
 914             if (RTSP_RTP_PORT_MIN != 0) {
 915                 while(j <= RTSP_RTP_PORT_MAX) {
 916                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 917                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 918                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 919                         goto rtp_opened;
 920                     }
 921                 }
 922             }
 923
 924 /*            then try on any port
 925 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 926 **                err = AVERROR_INVALIDDATA;
 927 **                goto fail;
 928 **            }
 929 */
 930
 931         rtp_opened:
 932             port = rtp_get_local_port(rtsp_st->rtp_handle);
 933             snprintf(transport, sizeof(transport) - 1,
 934                      "%s/UDP;", trans_pref);
 935             if (rt->server_type != RTSP_SERVER_REAL)
 936                 av_strlcat(transport, "unicast;", sizeof(transport));
 937             av_strlcatf(transport, sizeof(transport),
 938                      "client_port=%d", port);
 939             if (rt->transport == RTSP_TRANSPORT_RTP)
 940                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
 941         }
 942
 943         /* RTP/TCP */
 944         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 945             snprintf(transport, sizeof(transport) - 1,
 946                      "%s/TCP;", trans_pref);
 947             if (rt->server_type == RTSP_SERVER_WMS)
 948                 av_strlcat(transport, "unicast;", sizeof(transport));
 949             av_strlcatf(transport, sizeof(transport),
 950                         "interleaved=%d-%d",
 951                         interleave, interleave + 1);
 952             interleave += 2;
 953         }
 954
 955         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
 956             snprintf(transport, sizeof(transport) - 1,
 957                      "%s/UDP;multicast", trans_pref);
 958         }
 959         if (rt->server_type == RTSP_SERVER_REAL ||
 960             rt->server_type == RTSP_SERVER_WMS)
 961             av_strlcat(transport, ";mode=play", sizeof(transport));
 962         snprintf(cmd, sizeof(cmd),
 963                  "SETUP %s RTSP/1.0\r\n"
 964                  "Transport: %s\r\n",
 965                  rtsp_st->control_url, transport);
 966         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
 967             char real_res[41], real_csum[9];
 968             ff_rdt_calc_response_and_checksum(real_res, real_csum,
 969                                               real_challenge);
 970             av_strlcatf(cmd, sizeof(cmd),
 971                         "If-Match: %s\r\n"
 972                         "RealChallenge2: %s, sd=%s\r\n",
 973                         rt->session_id, real_res, real_csum);
 974         }
 975         rtsp_send_cmd(s, cmd, reply, NULL);
 976         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
 977             err = 1;
 978             goto fail;
 979         } else if (reply->status_code != RTSP_STATUS_OK ||
 980                    reply->nb_transports != 1) {
 981             err = AVERROR_INVALIDDATA;
 982             goto fail;
 983         }
 984
 985         /* XXX: same protocol for all streams is required */
 986         if (i > 0) {
 987             if (reply->transports[0].lower_transport != rt->lower_transport ||
 988                 reply->transports[0].transport != rt->transport) {
 989                 err = AVERROR_INVALIDDATA;
 990                 goto fail;
 991             }
 992         } else {
 993             rt->lower_transport = reply->transports[0].lower_transport;
 994             rt->transport = reply->transports[0].transport;
 995         }
 996
 997         /* close RTP connection if not choosen */
 998         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
 999             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1000             url_close(rtsp_st->rtp_handle);
1001             rtsp_st->rtp_handle = NULL;
1002         }
1003
1004         switch(reply->transports[0].lower_transport) {
1005         case RTSP_LOWER_TRANSPORT_TCP:
1006             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1007             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1008             break;
1009
1010         case RTSP_LOWER_TRANSPORT_UDP:
1011             {
1012                 char url[1024];
1013
1014                 /* XXX: also use address if specified */
1015                 snprintf(url, sizeof(url), "rtp://%s:%d",
1016                          host, reply->transports[0].server_port_min);
1017                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1018                     err = AVERROR_INVALIDDATA;
1019                     goto fail;
1020                 }
1021             }
1022             break;
1023         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1024             {
1025                 char url[1024];
1026                 struct in_addr in;
1027
1028                 in.s_addr = htonl(reply->transports[0].destination);
1029                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1030                          inet_ntoa(in),
1031                          reply->transports[0].port_min,
1032                          reply->transports[0].ttl);
1033                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1034                     err = AVERROR_INVALIDDATA;
1035                     goto fail;
1036                 }
1037             }
1038             break;
1039         }
1040
1041         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1042             goto fail;
1043     }
1044
1045     if (rt->server_type == RTSP_SERVER_REAL)
1046         rt->need_subscription = 1;
1047
1048     return 0;
1049
1050 fail:
1051     for (i=0; i<rt->nb_rtsp_streams; i++) {
1052         if (rt->rtsp_streams[i]->rtp_handle) {
1053             url_close(rt->rtsp_streams[i]->rtp_handle);
1054             rt->rtsp_streams[i]->rtp_handle = NULL;
1055         }
1056     }
1057     return err;
1058 }
1059
1060 static int rtsp_read_header(AVFormatContext *s,
1061                             AVFormatParameters *ap)
1062 {
1063     RTSPState *rt = s->priv_data;
1064     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1065     URLContext *rtsp_hd;
1066     int port, ret, err;
1067     RTSPHeader reply1, *reply = &reply1;
1068     unsigned char *content = NULL;
1069     int lower_transport_mask = 0;
1070     char real_challenge[64];
1071
1072     /* extract hostname and port */
1073     url_split(NULL, 0, NULL, 0,
1074               host, sizeof(host), &port, path, sizeof(path), s->filename);
1075     if (port < 0)
1076         port = RTSP_DEFAULT_PORT;
1077
1078     /* search for options */
1079     option_list = strchr(path, '?');
1080     if (option_list) {
1081         /* remove the options from the path */
1082         *option_list++ = 0;
1083         while(option_list) {
1084             /* move the option pointer */
1085             option = option_list;
1086             option_list = strchr(option_list, '&');
1087             if (option_list)
1088                 *(option_list++) = 0;
1089             /* handle the options */
1090             if (strcmp(option, "udp") == 0)
1091                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1092             else if (strcmp(option, "multicast") == 0)
1093                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1094             else if (strcmp(option, "tcp") == 0)
1095                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1096         }
1097     }
1098
1099     if (!lower_transport_mask)
1100         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1101
1102     /* open the tcp connexion */
1103     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1104     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1105         return AVERROR(EIO);
1106     rt->rtsp_hd = rtsp_hd;
1107     rt->seq = 0;
1108
1109     /* request options supported by the server; this also detects server type */
1110     for (rt->server_type = RTSP_SERVER_RTP;;) {
1111         snprintf(cmd, sizeof(cmd),
1112                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1113         if (rt->server_type == RTSP_SERVER_REAL)
1114             av_strlcat(cmd,
1115                        /**
1116                         * The following entries are required for proper
1117                         * streaming from a Realmedia server. They are
1118                         * interdependent in some way although we currently
1119                         * don't quite understand how. Values were copied
1120                         * from mplayer SVN r23589.
1121                         * @param CompanyID is a 16-byte ID in base64
1122                         * @param ClientChallenge is a 16-byte ID in hex
1123                         */
1124                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1125                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1126                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1127                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1128                        sizeof(cmd));
1129         rtsp_send_cmd(s, cmd, reply, NULL);
1130         if (reply->status_code != RTSP_STATUS_OK) {
1131             err = AVERROR_INVALIDDATA;
1132             goto fail;
1133         }
1134
1135         /* detect server type if not standard-compliant RTP */
1136         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1137             rt->server_type = RTSP_SERVER_REAL;
1138             continue;
1139         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1140             rt->server_type = RTSP_SERVER_WMS;
1141         } else if (rt->server_type == RTSP_SERVER_REAL) {
1142             strcpy(real_challenge, reply->real_challenge);
1143         }
1144         break;
1145     }
1146
1147     /* describe the stream */
1148     snprintf(cmd, sizeof(cmd),
1149              "DESCRIBE %s RTSP/1.0\r\n"
1150              "Accept: application/sdp\r\n",
1151              s->filename);
1152     if (rt->server_type == RTSP_SERVER_REAL) {
1153         /**
1154          * The Require: attribute is needed for proper streaming from
1155          * Realmedia servers.
1156          */
1157         av_strlcat(cmd,
1158                    "Require: com.real.retain-entity-for-setup\r\n",
1159                    sizeof(cmd));
1160     }
1161     rtsp_send_cmd(s, cmd, reply, &content);
1162     if (!content) {
1163         err = AVERROR_INVALIDDATA;
1164         goto fail;
1165     }
1166     if (reply->status_code != RTSP_STATUS_OK) {
1167         err = AVERROR_INVALIDDATA;
1168         goto fail;
1169     }
1170
1171     /* now we got the SDP description, we parse it */
1172     ret = sdp_parse(s, (const char *)content);
1173     av_freep(&content);
1174     if (ret < 0) {
1175         err = AVERROR_INVALIDDATA;
1176         goto fail;
1177     }
1178
1179     do {
1180         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1181
1182         err = make_setup_request(s, host, port, lower_transport,
1183                                  rt->server_type == RTSP_SERVER_REAL ?
1184                                      real_challenge : NULL);
1185         if (err < 0)
1186             goto fail;
1187         lower_transport_mask &= ~(1 << lower_transport);
1188         if (lower_transport_mask == 0 && err == 1) {
1189             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1190             goto fail;
1191         }
1192     } while (err);
1193
1194     rt->state = RTSP_STATE_IDLE;
1195     rt->seek_timestamp = 0; /* default is to start stream at position
1196                                zero */
1197     if (ap->initial_pause) {
1198         /* do not start immediately */
1199     } else {
1200         if (rtsp_read_play(s) < 0) {
1201             err = AVERROR_INVALIDDATA;
1202             goto fail;
1203         }
1204     }
1205     return 0;
1206  fail:
1207     rtsp_close_streams(rt);
1208     av_freep(&content);
1209     url_close(rt->rtsp_hd);
1210     return err;
1211 }
1212
1213 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1214                            uint8_t *buf, int buf_size)
1215 {
1216     RTSPState *rt = s->priv_data;
1217     int id, len, i, ret;
1218     RTSPStream *rtsp_st;
1219
1220 #ifdef DEBUG_RTP_TCP
1221     printf("tcp_read_packet:\n");
1222 #endif
1223  redo:
1224     for(;;) {
1225         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1226 #ifdef DEBUG_RTP_TCP
1227         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1228 #endif
1229         if (ret != 1)
1230             return -1;
1231         if (buf[0] == '$')
1232             break;
1233     }
1234     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1235     if (ret != 3)
1236         return -1;
1237     id = buf[0];
1238     len = AV_RB16(buf + 1);
1239 #ifdef DEBUG_RTP_TCP
1240     printf("id=%d len=%d\n", id, len);
1241 #endif
1242     if (len > buf_size || len < 12)
1243         goto redo;
1244     /* get the data */
1245     ret = url_readbuf(rt->rtsp_hd, buf, len);
1246     if (ret != len)
1247         return -1;
1248     if (rt->transport == RTSP_TRANSPORT_RDT &&
1249         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1250         return -1;
1251
1252     /* find the matching stream */
1253     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1254         rtsp_st = rt->rtsp_streams[i];
1255         if (id >= rtsp_st->interleaved_min &&
1256             id <= rtsp_st->interleaved_max)
1257             goto found;
1258     }
1259     goto redo;
1260  found:
1261     *prtsp_st = rtsp_st;
1262     return len;
1263 }
1264
1265 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1266                            uint8_t *buf, int buf_size)
1267 {
1268     RTSPState *rt = s->priv_data;
1269     RTSPStream *rtsp_st;
1270     fd_set rfds;
1271     int fd1, fd2, fd_max, n, i, ret;
1272     struct timeval tv;
1273
1274     for(;;) {
1275         if (url_interrupt_cb())
1276             return AVERROR(EINTR);
1277         FD_ZERO(&rfds);
1278         fd_max = -1;
1279         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1280             rtsp_st = rt->rtsp_streams[i];
1281             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1282             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1283             if (fd1 > fd_max)
1284                 fd_max = fd1;
1285             FD_SET(fd1, &rfds);
1286         }
1287         tv.tv_sec = 0;
1288         tv.tv_usec = 100 * 1000;
1289         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1290         if (n > 0) {
1291             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1292                 rtsp_st = rt->rtsp_streams[i];
1293                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1294                 if (FD_ISSET(fd1, &rfds)) {
1295                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1296                     if (ret > 0) {
1297                         *prtsp_st = rtsp_st;
1298                         return ret;
1299                     }
1300                 }
1301             }
1302         }
1303     }
1304 }
1305
1306 static int rtsp_read_packet(AVFormatContext *s,
1307                             AVPacket *pkt)
1308 {
1309     RTSPState *rt = s->priv_data;
1310     RTSPStream *rtsp_st;
1311     int ret, len;
1312     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1313
1314     if (rt->server_type == RTSP_SERVER_REAL) {
1315         int i;
1316         RTSPHeader reply1, *reply = &reply1;
1317         enum AVDiscard cache[MAX_STREAMS];
1318         char cmd[1024];
1319
1320         for (i = 0; i < s->nb_streams; i++)
1321             cache[i] = s->streams[i]->discard;
1322
1323         if (!rt->need_subscription) {
1324             if (memcmp (cache, rt->real_setup_cache,
1325                         sizeof(enum AVDiscard) * s->nb_streams)) {
1326                 av_strlcatf(cmd, sizeof(cmd),
1327                             "SET_PARAMETER %s RTSP/1.0\r\n"
1328                             "Unsubscribe: %s\r\n",
1329                             s->filename, rt->last_subscription);
1330                 rtsp_send_cmd(s, cmd, reply, NULL);
1331                 if (reply->status_code != RTSP_STATUS_OK)
1332                     return AVERROR_INVALIDDATA;
1333                 rt->need_subscription = 1;
1334             }
1335         }
1336
1337         if (rt->need_subscription) {
1338             int r, rule_nr, first = 1;
1339
1340             memcpy(rt->real_setup_cache, cache,
1341                    sizeof(enum AVDiscard) * s->nb_streams);
1342             rt->last_subscription[0] = 0;
1343
1344             snprintf(cmd, sizeof(cmd),
1345                      "SET_PARAMETER %s RTSP/1.0\r\n"
1346                      "Subscribe: ",
1347                      s->filename);
1348             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1349                 rule_nr = 0;
1350                 for (r = 0; r < s->nb_streams; r++) {
1351                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1352                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1353                             if (!first)
1354                                 av_strlcat(rt->last_subscription, ",",
1355                                            sizeof(rt->last_subscription));
1356                             ff_rdt_subscribe_rule(
1357                                 rt->last_subscription,
1358                                 sizeof(rt->last_subscription), i, rule_nr);
1359                             first = 0;
1360                         }
1361                         rule_nr++;
1362                     }
1363                 }
1364             }
1365             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1366             rtsp_send_cmd(s, cmd, reply, NULL);
1367             if (reply->status_code != RTSP_STATUS_OK)
1368                 return AVERROR_INVALIDDATA;
1369             rt->need_subscription = 0;
1370
1371             if (rt->state == RTSP_STATE_PLAYING)
1372                 rtsp_read_play (s);
1373         }
1374     }
1375
1376     /* get next frames from the same RTP packet */
1377     if (rt->cur_transport_priv) {
1378         if (rt->transport == RTSP_TRANSPORT_RDT)
1379             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1380         else
1381             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1382         if (ret == 0) {
1383             rt->cur_transport_priv = NULL;
1384             return 0;
1385         } else if (ret == 1) {
1386             return 0;
1387         } else {
1388             rt->cur_transport_priv = NULL;
1389         }
1390     }
1391
1392     /* read next RTP packet */
1393  redo:
1394     switch(rt->lower_transport) {
1395     default:
1396     case RTSP_LOWER_TRANSPORT_TCP:
1397         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1398         break;
1399     case RTSP_LOWER_TRANSPORT_UDP:
1400     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1401         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1402         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1403             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1404         break;
1405     }
1406     if (len < 0)
1407         return len;
1408     if (rt->transport == RTSP_TRANSPORT_RDT)
1409         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1410     else
1411         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1412     if (ret < 0)
1413         goto redo;
1414     if (ret == 1) {
1415         /* more packets may follow, so we save the RTP context */
1416         rt->cur_transport_priv = rtsp_st->transport_priv;
1417     }
1418     return 0;
1419 }
1420
1421 static int rtsp_read_play(AVFormatContext *s)
1422 {
1423     RTSPState *rt = s->priv_data;
1424     RTSPHeader reply1, *reply = &reply1;
1425     char cmd[1024];
1426
1427     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1428
1429     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1430         if (rt->state == RTSP_STATE_PAUSED) {
1431             snprintf(cmd, sizeof(cmd),
1432                      "PLAY %s RTSP/1.0\r\n",
1433                      s->filename);
1434         } else {
1435             snprintf(cmd, sizeof(cmd),
1436                      "PLAY %s RTSP/1.0\r\n"
1437                      "Range: npt=%0.3f-\r\n",
1438                      s->filename,
1439                      (double)rt->seek_timestamp / AV_TIME_BASE);
1440         }
1441         rtsp_send_cmd(s, cmd, reply, NULL);
1442         if (reply->status_code != RTSP_STATUS_OK) {
1443             return -1;
1444         }
1445     }
1446     rt->state = RTSP_STATE_PLAYING;
1447     return 0;
1448 }
1449
1450 /* pause the stream */
1451 static int rtsp_read_pause(AVFormatContext *s)
1452 {
1453     RTSPState *rt = s->priv_data;
1454     RTSPHeader reply1, *reply = &reply1;
1455     char cmd[1024];
1456
1457     rt = s->priv_data;
1458
1459     if (rt->state != RTSP_STATE_PLAYING)
1460         return 0;
1461     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1462         snprintf(cmd, sizeof(cmd),
1463                  "PAUSE %s RTSP/1.0\r\n",
1464                  s->filename);
1465         rtsp_send_cmd(s, cmd, reply, NULL);
1466         if (reply->status_code != RTSP_STATUS_OK) {
1467             return -1;
1468         }
1469     }
1470     rt->state = RTSP_STATE_PAUSED;
1471     return 0;
1472 }
1473
1474 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1475                           int64_t timestamp, int flags)
1476 {
1477     RTSPState *rt = s->priv_data;
1478
1479     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1480     switch(rt->state) {
1481     default:
1482     case RTSP_STATE_IDLE:
1483         break;
1484     case RTSP_STATE_PLAYING:
1485         if (rtsp_read_play(s) != 0)
1486             return -1;
1487         break;
1488     case RTSP_STATE_PAUSED:
1489         rt->state = RTSP_STATE_IDLE;
1490         break;
1491     }
1492     return 0;
1493 }
1494
1495 static int rtsp_read_close(AVFormatContext *s)
1496 {
1497     RTSPState *rt = s->priv_data;
1498     RTSPHeader reply1, *reply = &reply1;
1499     char cmd[1024];
1500
1501 #if 0
1502     /* NOTE: it is valid to flush the buffer here */
1503     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1504         url_fclose(&rt->rtsp_gb);
1505     }
1506 #endif
1507     snprintf(cmd, sizeof(cmd),
1508              "TEARDOWN %s RTSP/1.0\r\n",
1509              s->filename);
1510     rtsp_send_cmd(s, cmd, reply, NULL);
1511
1512     rtsp_close_streams(rt);
1513     url_close(rt->rtsp_hd);
1514     return 0;
1515 }
1516
1517 #if CONFIG_RTSP_DEMUXER
1518 AVInputFormat rtsp_demuxer = {
1519     "rtsp",
1520     NULL_IF_CONFIG_SMALL("RTSP input format"),
1521     sizeof(RTSPState),
1522     rtsp_probe,
1523     rtsp_read_header,
1524     rtsp_read_packet,
1525     rtsp_read_close,
1526     rtsp_read_seek,
1527     .flags = AVFMT_NOFILE,
1528     .read_play = rtsp_read_play,
1529     .read_pause = rtsp_read_pause,
1530 };
1531 #endif
1532
1533 static int sdp_probe(AVProbeData *p1)
1534 {
1535     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1536
1537     /* we look for a line beginning "c=IN IP4" */
1538     while (p < p_end && *p != '\0') {
1539         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1540             return AVPROBE_SCORE_MAX / 2;
1541
1542         while(p < p_end - 1 && *p != '\n') p++;
1543         if (++p >= p_end)
1544             break;
1545         if (*p == '\r')
1546             p++;
1547     }
1548     return 0;
1549 }
1550
1551 #define SDP_MAX_SIZE 8192
1552
1553 static int sdp_read_header(AVFormatContext *s,
1554                            AVFormatParameters *ap)
1555 {
1556     RTSPState *rt = s->priv_data;
1557     RTSPStream *rtsp_st;
1558     int size, i, err;
1559     char *content;
1560     char url[1024];
1561
1562     /* read the whole sdp file */
1563     /* XXX: better loading */
1564     content = av_malloc(SDP_MAX_SIZE);
1565     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1566     if (size <= 0) {
1567         av_free(content);
1568         return AVERROR_INVALIDDATA;
1569     }
1570     content[size] ='\0';
1571
1572     sdp_parse(s, content);
1573     av_free(content);
1574
1575     /* open each RTP stream */
1576     for(i=0;i<rt->nb_rtsp_streams;i++) {
1577         rtsp_st = rt->rtsp_streams[i];
1578
1579         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1580                  inet_ntoa(rtsp_st->sdp_ip),
1581                  rtsp_st->sdp_port,
1582                  rtsp_st->sdp_port,
1583                  rtsp_st->sdp_ttl);
1584         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1585             err = AVERROR_INVALIDDATA;
1586             goto fail;
1587         }
1588         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1589             goto fail;
1590     }
1591     return 0;
1592  fail:
1593     rtsp_close_streams(rt);
1594     return err;
1595 }
1596
1597 static int sdp_read_packet(AVFormatContext *s,
1598                             AVPacket *pkt)
1599 {
1600     return rtsp_read_packet(s, pkt);
1601 }
1602
1603 static int sdp_read_close(AVFormatContext *s)
1604 {
1605     RTSPState *rt = s->priv_data;
1606     rtsp_close_streams(rt);
1607     return 0;
1608 }
1609
1610 #if CONFIG_SDP_DEMUXER
1611 AVInputFormat sdp_demuxer = {
1612     "sdp",
1613     NULL_IF_CONFIG_SMALL("SDP"),
1614     sizeof(RTSPState),
1615     sdp_probe,
1616     sdp_read_header,
1617     sdp_read_packet,
1618     sdp_read_close,
1619 };
1620 #endif
1621
1622 #if CONFIG_REDIR_DEMUXER
1623 /* dummy redirector format (used directly in av_open_input_file now) */
1624 static int redir_probe(AVProbeData *pd)
1625 {
1626     const char *p;
1627     p = pd->buf;
1628     while (redir_isspace(*p))
1629         p++;
1630     if (av_strstart(p, "http://", NULL) ||
1631         av_strstart(p, "rtsp://", NULL))
1632         return AVPROBE_SCORE_MAX;
1633     return 0;
1634 }
1635
1636 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1637 {
1638     char buf[4096], *q;
1639     int c;
1640     AVFormatContext *ic = NULL;
1641     ByteIOContext *f = s->pb;
1642
1643     /* parse each URL and try to open it */
1644     c = url_fgetc(f);
1645     while (c != URL_EOF) {
1646         /* skip spaces */
1647         for(;;) {
1648             if (!redir_isspace(c))
1649                 break;
1650             c = url_fgetc(f);
1651         }
1652         if (c == URL_EOF)
1653             break;
1654         /* record url */
1655         q = buf;
1656         for(;;) {
1657             if (c == URL_EOF || redir_isspace(c))
1658                 break;
1659             if ((q - buf) < sizeof(buf) - 1)
1660                 *q++ = c;
1661             c = url_fgetc(f);
1662         }
1663         *q = '\0';
1664         //printf("URL='%s'\n", buf);
1665         /* try to open the media file */
1666         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1667             break;
1668     }
1669     if (!ic)
1670         return AVERROR(EIO);
1671
1672     *s = *ic;
1673     url_fclose(f);
1674
1675     return 0;
1676 }
1677
1678 AVInputFormat redir_demuxer = {
1679     "redir",
1680     NULL_IF_CONFIG_SMALL("Redirector format"),
1681     0,
1682     redir_probe,
1683     redir_read_header,
1684     NULL,
1685     NULL,
1686 };
1687 #endif