libavformat/rtsp.c

   1 /*
   2  * RTSP/SDP client
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /* needed by inet_aton() */
  23 #define _SVID_SOURCE
  24
  25 #include "libavutil/avstring.h"
  26 #include "libavutil/intreadwrite.h"
  27 #include "avformat.h"
  28
  29 #include <sys/time.h>
  30 #if HAVE_SYS_SELECT_H
  31 #include <sys/select.h>
  32 #endif
  33 #include <strings.h>
  34 #include "network.h"
  35 #include "rtsp.h"
  36
  37 #include "rtpdec.h"
  38 #include "rdt.h"
  39 #include "rtp_asf.h"
  40 #include "rtp_vorbis.h"
  41
  42 //#define DEBUG
  43 //#define DEBUG_RTP_TCP
  44
  45 static int rtsp_read_play(AVFormatContext *s);
  46
  47 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  48 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
  49 #endif
  50
  51 static int rtsp_probe(AVProbeData *p)
  52 {
  53     if (av_strstart(p->filename, "rtsp:", NULL))
  54         return AVPROBE_SCORE_MAX;
  55     return 0;
  56 }
  57
  58 #define SPACE_CHARS " \t\r\n"
  59 /* we use memchr() instead of strchr() here because strchr() will return
  60  * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
  61 #define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
  62 static void skip_spaces(const char **pp)
  63 {
  64     const char *p;
  65     p = *pp;
  66     while (redir_isspace(*p))
  67         p++;
  68     *pp = p;
  69 }
  70
  71 static void get_word_until_chars(char *buf, int buf_size,
  72                                  const char *sep, const char **pp)
  73 {
  74     const char *p;
  75     char *q;
  76
  77     p = *pp;
  78     skip_spaces(&p);
  79     q = buf;
  80     while (!strchr(sep, *p) && *p != '\0') {
  81         if ((q - buf) < buf_size - 1)
  82             *q++ = *p;
  83         p++;
  84     }
  85     if (buf_size > 0)
  86         *q = '\0';
  87     *pp = p;
  88 }
  89
  90 static void get_word_sep(char *buf, int buf_size, const char *sep,
  91                          const char **pp)
  92 {
  93     if (**pp == '/') (*pp)++;
  94     get_word_until_chars(buf, buf_size, sep, pp);
  95 }
  96
  97 static void get_word(char *buf, int buf_size, const char **pp)
  98 {
  99     get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
 100 }
 101
 102 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 103    params>] */
 104 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 105 {
 106     char buf[256];
 107     int i;
 108     AVCodec *c;
 109     const char *c_name;
 110
 111     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 112        see if we can handle this kind of payload */
 113     get_word_sep(buf, sizeof(buf), "/", &p);
 114     if (payload_type >= RTP_PT_PRIVATE) {
 115         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 116         while(handler) {
 117             if (!strcasecmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 118                 codec->codec_id = handler->codec_id;
 119                 rtsp_st->dynamic_handler= handler;
 120                 if(handler->open) {
 121                     rtsp_st->dynamic_protocol_context= handler->open();
 122                 }
 123                 break;
 124             }
 125             handler= handler->next;
 126         }
 127     } else {
 128         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 129         /* search into AVRtpPayloadTypes[] */
 130         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 131     }
 132
 133     c = avcodec_find_decoder(codec->codec_id);
 134     if (c && c->name)
 135         c_name = c->name;
 136     else
 137         c_name = (char *)NULL;
 138
 139     if (c_name) {
 140         get_word_sep(buf, sizeof(buf), "/", &p);
 141         i = atoi(buf);
 142         switch (codec->codec_type) {
 143             case CODEC_TYPE_AUDIO:
 144                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 145                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 146                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 147                 if (i > 0) {
 148                     codec->sample_rate = i;
 149                     get_word_sep(buf, sizeof(buf), "/", &p);
 150                     i = atoi(buf);
 151                     if (i > 0)
 152                         codec->channels = i;
 153                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 154                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 155                 }
 156                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 157                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 158                 break;
 159             case CODEC_TYPE_VIDEO:
 160                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 161                 break;
 162             default:
 163                 break;
 164         }
 165         return 0;
 166     }
 167
 168     return -1;
 169 }
 170
 171 /* return the length and optionnaly the data */
 172 static int hex_to_data(uint8_t *data, const char *p)
 173 {
 174     int c, len, v;
 175
 176     len = 0;
 177     v = 1;
 178     for(;;) {
 179         skip_spaces(&p);
 180         if (*p == '\0')
 181             break;
 182         c = toupper((unsigned char)*p++);
 183         if (c >= '0' && c <= '9')
 184             c = c - '0';
 185         else if (c >= 'A' && c <= 'F')
 186             c = c - 'A' + 10;
 187         else
 188             break;
 189         v = (v << 4) | c;
 190         if (v & 0x100) {
 191             if (data)
 192                 data[len] = v;
 193             len++;
 194             v = 1;
 195         }
 196     }
 197     return len;
 198 }
 199
 200 static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
 201                                   char *attr, char *value)
 202 {
 203     switch (codec->codec_id) {
 204         case CODEC_ID_MPEG4:
 205         case CODEC_ID_AAC:
 206             if (!strcmp(attr, "config")) {
 207                 /* decode the hexa encoded parameter */
 208                 int len = hex_to_data(NULL, value);
 209                 if (codec->extradata)
 210                     av_free(codec->extradata);
 211                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 212                 if (!codec->extradata)
 213                     return;
 214                 codec->extradata_size = len;
 215                 hex_to_data(codec->extradata, value);
 216             }
 217             break;
 218         case CODEC_ID_VORBIS:
 219             ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
 220             break;
 221         default:
 222             break;
 223     }
 224     return;
 225 }
 226
 227 typedef struct {
 228     const char *str;
 229     uint16_t type;
 230     uint32_t offset;
 231 } AttrNameMap;
 232
 233 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 234 #define ATTR_NAME_TYPE_INT 0
 235 #define ATTR_NAME_TYPE_STR 1
 236 static const AttrNameMap attr_names[]=
 237 {
 238     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, sizelength)},
 239     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexlength)},
 240     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexdeltalength)},
 241     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, profile_level_id)},
 242     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, streamtype)},
 243     {"mode",             ATTR_NAME_TYPE_STR, offsetof(RTPPayloadData, mode)},
 244     {NULL, -1, -1},
 245 };
 246
 247 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 248 * because it is used in rtp_h264.c, which is forthcoming.
 249 */
 250 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 251 {
 252     skip_spaces(p);
 253     if(**p) {
 254         get_word_sep(attr, attr_size, "=", p);
 255         if (**p == '=')
 256             (*p)++;
 257         get_word_sep(value, value_size, ";", p);
 258         if (**p == ';')
 259             (*p)++;
 260         return 1;
 261     }
 262     return 0;
 263 }
 264
 265 /* parse a SDP line and save stream attributes */
 266 static void sdp_parse_fmtp(AVStream *st, const char *p)
 267 {
 268     char attr[256];
 269     /* Vorbis setup headers can be up to 12KB and are sent base64
 270      * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
 271     char value[16384];
 272     int i;
 273
 274     RTSPStream *rtsp_st = st->priv_data;
 275     AVCodecContext *codec = st->codec;
 276     RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
 277
 278     /* loop on each attribute */
 279     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 280     {
 281         /* grab the codec extra_data from the config parameter of the fmtp line */
 282         sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
 283                               attr, value);
 284         /* Looking for a known attribute */
 285         for (i = 0; attr_names[i].str; ++i) {
 286             if (!strcasecmp(attr, attr_names[i].str)) {
 287                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 288                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 289                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 290                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 291             }
 292         }
 293     }
 294 }
 295
 296 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 297  *  and end time.
 298  *  Used for seeking in the rtp stream.
 299  */
 300 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 301 {
 302     char buf[256];
 303
 304     skip_spaces(&p);
 305     if (!av_stristart(p, "npt=", &p))
 306         return;
 307
 308     *start = AV_NOPTS_VALUE;
 309     *end = AV_NOPTS_VALUE;
 310
 311     get_word_sep(buf, sizeof(buf), "-", &p);
 312     *start = parse_date(buf, 1);
 313     if (*p == '-') {
 314         p++;
 315         get_word_sep(buf, sizeof(buf), "-", &p);
 316         *end = parse_date(buf, 1);
 317     }
 318 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 319 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 320 }
 321
 322 typedef struct SDPParseState {
 323     /* SDP only */
 324     struct in_addr default_ip;
 325     int default_ttl;
 326     int skip_media; ///< set if an unknown m= line occurs
 327 } SDPParseState;
 328
 329 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 330                            int letter, const char *buf)
 331 {
 332     RTSPState *rt = s->priv_data;
 333     char buf1[64], st_type[64];
 334     const char *p;
 335     enum CodecType codec_type;
 336     int payload_type, i;
 337     AVStream *st;
 338     RTSPStream *rtsp_st;
 339     struct in_addr sdp_ip;
 340     int ttl;
 341
 342     dprintf(s, "sdp: %c='%s'\n", letter, buf);
 343
 344     p = buf;
 345     if (s1->skip_media && letter != 'm')
 346         return;
 347     switch(letter) {
 348     case 'c':
 349         get_word(buf1, sizeof(buf1), &p);
 350         if (strcmp(buf1, "IN") != 0)
 351             return;
 352         get_word(buf1, sizeof(buf1), &p);
 353         if (strcmp(buf1, "IP4") != 0)
 354             return;
 355         get_word_sep(buf1, sizeof(buf1), "/", &p);
 356         if (inet_aton(buf1, &sdp_ip) == 0)
 357             return;
 358         ttl = 16;
 359         if (*p == '/') {
 360             p++;
 361             get_word_sep(buf1, sizeof(buf1), "/", &p);
 362             ttl = atoi(buf1);
 363         }
 364         if (s->nb_streams == 0) {
 365             s1->default_ip = sdp_ip;
 366             s1->default_ttl = ttl;
 367         } else {
 368             st = s->streams[s->nb_streams - 1];
 369             rtsp_st = st->priv_data;
 370             rtsp_st->sdp_ip = sdp_ip;
 371             rtsp_st->sdp_ttl = ttl;
 372         }
 373         break;
 374     case 's':
 375         av_metadata_set(&s->metadata, "title", p);
 376         break;
 377     case 'i':
 378         if (s->nb_streams == 0) {
 379             av_metadata_set(&s->metadata, "comment", p);
 380             break;
 381         }
 382         break;
 383     case 'm':
 384         /* new stream */
 385         s1->skip_media = 0;
 386         get_word(st_type, sizeof(st_type), &p);
 387         if (!strcmp(st_type, "audio")) {
 388             codec_type = CODEC_TYPE_AUDIO;
 389         } else if (!strcmp(st_type, "video")) {
 390             codec_type = CODEC_TYPE_VIDEO;
 391         } else if (!strcmp(st_type, "application")) {
 392             codec_type = CODEC_TYPE_DATA;
 393         } else {
 394             s1->skip_media = 1;
 395             return;
 396         }
 397         rtsp_st = av_mallocz(sizeof(RTSPStream));
 398         if (!rtsp_st)
 399             return;
 400         rtsp_st->stream_index = -1;
 401         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 402
 403         rtsp_st->sdp_ip = s1->default_ip;
 404         rtsp_st->sdp_ttl = s1->default_ttl;
 405
 406         get_word(buf1, sizeof(buf1), &p); /* port */
 407         rtsp_st->sdp_port = atoi(buf1);
 408
 409         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 410
 411         /* XXX: handle list of formats */
 412         get_word(buf1, sizeof(buf1), &p); /* format list */
 413         rtsp_st->sdp_payload_type = atoi(buf1);
 414
 415         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 416             /* no corresponding stream */
 417         } else {
 418             st = av_new_stream(s, 0);
 419             if (!st)
 420                 return;
 421             st->priv_data = rtsp_st;
 422             rtsp_st->stream_index = st->index;
 423             st->codec->codec_type = codec_type;
 424             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 425                 /* if standard payload type, we can find the codec right now */
 426                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 427             }
 428         }
 429         /* put a default control url */
 430         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 431         break;
 432     case 'a':
 433         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 434             char proto[32];
 435             /* get the control url */
 436             st = s->streams[s->nb_streams - 1];
 437             rtsp_st = st->priv_data;
 438
 439             /* XXX: may need to add full url resolution */
 440             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 441             if (proto[0] == '\0') {
 442                 /* relative control URL */
 443                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 444                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 445             } else {
 446                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 447             }
 448         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 449             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 450             get_word(buf1, sizeof(buf1), &p);
 451             payload_type = atoi(buf1);
 452             st = s->streams[s->nb_streams - 1];
 453             rtsp_st = st->priv_data;
 454             sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 455         } else if (av_strstart(p, "fmtp:", &p)) {
 456             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 457             get_word(buf1, sizeof(buf1), &p);
 458             payload_type = atoi(buf1);
 459             for(i = 0; i < s->nb_streams;i++) {
 460                 st = s->streams[i];
 461                 rtsp_st = st->priv_data;
 462                 if (rtsp_st->sdp_payload_type == payload_type) {
 463                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 464                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
 465                             sdp_parse_fmtp(st, p);
 466                         }
 467                     } else {
 468                         sdp_parse_fmtp(st, p);
 469                     }
 470                 }
 471             }
 472         } else if(av_strstart(p, "framesize:", &p)) {
 473             // let dynamic protocol handlers have a stab at the line.
 474             get_word(buf1, sizeof(buf1), &p);
 475             payload_type = atoi(buf1);
 476             for(i = 0; i < s->nb_streams;i++) {
 477                 st = s->streams[i];
 478                 rtsp_st = st->priv_data;
 479                 if (rtsp_st->sdp_payload_type == payload_type) {
 480                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 481                         rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
 482                     }
 483                 }
 484             }
 485         } else if(av_strstart(p, "range:", &p)) {
 486             int64_t start, end;
 487
 488             // this is so that seeking on a streamed file can work.
 489             rtsp_parse_range_npt(p, &start, &end);
 490             s->start_time= start;
 491             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 492         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 493             if (atoi(p) == 1)
 494                 rt->transport = RTSP_TRANSPORT_RDT;
 495         } else {
 496             if (rt->server_type == RTSP_SERVER_WMS)
 497                 ff_wms_parse_sdp_a_line(s, p);
 498             if (s->nb_streams > 0) {
 499                 if (rt->server_type == RTSP_SERVER_REAL)
 500                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 501
 502                 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 503                 if (rtsp_st->dynamic_handler &&
 504                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 505                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
 506                         rtsp_st->dynamic_protocol_context, buf);
 507             }
 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      *
 523      * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
 524     char buf[16384], *q;
 525     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 526
 527     memset(s1, 0, sizeof(SDPParseState));
 528     p = content;
 529     for(;;) {
 530         skip_spaces(&p);
 531         letter = *p;
 532         if (letter == '\0')
 533             break;
 534         p++;
 535         if (*p != '=')
 536             goto next_line;
 537         p++;
 538         /* get the content */
 539         q = buf;
 540         while (*p != '\n' && *p != '\r' && *p != '\0') {
 541             if ((q - buf) < sizeof(buf) - 1)
 542                 *q++ = *p;
 543             p++;
 544         }
 545         *q = '\0';
 546         sdp_parse_line(s, s1, letter, buf);
 547     next_line:
 548         while (*p != '\n' && *p != '\0')
 549             p++;
 550         if (*p == '\n')
 551             p++;
 552     }
 553     return 0;
 554 }
 555
 556 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 557 {
 558     const char *p;
 559     int v;
 560
 561     p = *pp;
 562     skip_spaces(&p);
 563     v = strtol(p, (char **)&p, 10);
 564     if (*p == '-') {
 565         p++;
 566         *min_ptr = v;
 567         v = strtol(p, (char **)&p, 10);
 568         *max_ptr = v;
 569     } else {
 570         *min_ptr = v;
 571         *max_ptr = v;
 572     }
 573     *pp = p;
 574 }
 575
 576 /* XXX: only one transport specification is parsed */
 577 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
 578 {
 579     char transport_protocol[16];
 580     char profile[16];
 581     char lower_transport[16];
 582     char parameter[16];
 583     RTSPTransportField *th;
 584     char buf[256];
 585
 586     reply->nb_transports = 0;
 587
 588     for(;;) {
 589         skip_spaces(&p);
 590         if (*p == '\0')
 591             break;
 592
 593         th = &reply->transports[reply->nb_transports];
 594
 595         get_word_sep(transport_protocol, sizeof(transport_protocol),
 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                 get_word_sep(lower_transport, sizeof(lower_transport),
 603                              ";,", &p);
 604             }
 605             th->transport = RTSP_TRANSPORT_RTP;
 606         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 607                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 608             /* x-pn-tng/<protocol> */
 609             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 610             profile[0] = '\0';
 611             th->transport = RTSP_TRANSPORT_RDT;
 612         }
 613         if (!strcasecmp(lower_transport, "TCP"))
 614             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 615         else
 616             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 617
 618         if (*p == ';')
 619             p++;
 620         /* get each parameter */
 621         while (*p != '\0' && *p != ',') {
 622             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 623             if (!strcmp(parameter, "port")) {
 624                 if (*p == '=') {
 625                     p++;
 626                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 627                 }
 628             } else if (!strcmp(parameter, "client_port")) {
 629                 if (*p == '=') {
 630                     p++;
 631                     rtsp_parse_range(&th->client_port_min,
 632                                      &th->client_port_max, &p);
 633                 }
 634             } else if (!strcmp(parameter, "server_port")) {
 635                 if (*p == '=') {
 636                     p++;
 637                     rtsp_parse_range(&th->server_port_min,
 638                                      &th->server_port_max, &p);
 639                 }
 640             } else if (!strcmp(parameter, "interleaved")) {
 641                 if (*p == '=') {
 642                     p++;
 643                     rtsp_parse_range(&th->interleaved_min,
 644                                      &th->interleaved_max, &p);
 645                 }
 646             } else if (!strcmp(parameter, "multicast")) {
 647                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 648                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 649             } else if (!strcmp(parameter, "ttl")) {
 650                 if (*p == '=') {
 651                     p++;
 652                     th->ttl = strtol(p, (char **)&p, 10);
 653                 }
 654             } else if (!strcmp(parameter, "destination")) {
 655                 struct in_addr ipaddr;
 656
 657                 if (*p == '=') {
 658                     p++;
 659                     get_word_sep(buf, sizeof(buf), ";,", &p);
 660                     if (inet_aton(buf, &ipaddr))
 661                         th->destination = ntohl(ipaddr.s_addr);
 662                 }
 663             }
 664             while (*p != ';' && *p != '\0' && *p != ',')
 665                 p++;
 666             if (*p == ';')
 667                 p++;
 668         }
 669         if (*p == ',')
 670             p++;
 671
 672         reply->nb_transports++;
 673     }
 674 }
 675
 676 void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
 677 {
 678     const char *p;
 679
 680     /* NOTE: we do case independent match for broken servers */
 681     p = buf;
 682     if (av_stristart(p, "Session:", &p)) {
 683         int t;
 684         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 685         if (av_stristart(p, ";timeout=", &p) &&
 686             (t = strtol(p, NULL, 10)) > 0) {
 687             reply->timeout = t;
 688         }
 689     } else if (av_stristart(p, "Content-Length:", &p)) {
 690         reply->content_length = strtol(p, NULL, 10);
 691     } else if (av_stristart(p, "Transport:", &p)) {
 692         rtsp_parse_transport(reply, p);
 693     } else if (av_stristart(p, "CSeq:", &p)) {
 694         reply->seq = strtol(p, NULL, 10);
 695     } else if (av_stristart(p, "Range:", &p)) {
 696         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 697     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 698         skip_spaces(&p);
 699         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 700     } else if (av_stristart(p, "Server:", &p)) {
 701         skip_spaces(&p);
 702         av_strlcpy(reply->server, p, sizeof(reply->server));
 703     } else if (av_stristart(p, "Notice:", &p) ||
 704                av_stristart(p, "X-Notice:", &p)) {
 705         reply->notice = strtol(p, NULL, 10);
 706     }
 707 }
 708
 709 /* skip a RTP/TCP interleaved packet */
 710 static void rtsp_skip_packet(AVFormatContext *s)
 711 {
 712     RTSPState *rt = s->priv_data;
 713     int ret, len, len1;
 714     uint8_t buf[1024];
 715
 716     ret = url_read_complete(rt->rtsp_hd, buf, 3);
 717     if (ret != 3)
 718         return;
 719     len = AV_RB16(buf + 1);
 720
 721     dprintf(s, "skipping RTP packet len=%d\n", len);
 722
 723     /* skip payload */
 724     while (len > 0) {
 725         len1 = len;
 726         if (len1 > sizeof(buf))
 727             len1 = sizeof(buf);
 728         ret = url_read_complete(rt->rtsp_hd, buf, len1);
 729         if (ret != len1)
 730             return;
 731         len -= len1;
 732     }
 733 }
 734
 735 /**
 736  * Read a RTSP message from the server, or prepare to read data
 737  * packets if we're reading data interleaved over the TCP/RTSP
 738  * connection as well.
 739  *
 740  * @param s RTSP demuxer context
 741  * @param reply pointer where the RTSP message header will be stored
 742  * @param content_ptr pointer where the RTSP message body, if any, will
 743  *                    be stored (length is in \p reply)
 744  * @param return_on_interleaved_data whether the function may return if we
 745  *                   encounter a data marker ('$'), which precedes data
 746  *                   packets over interleaved TCP/RTSP connections. If this
 747  *                   is set, this function will return 1 after encountering
 748  *                   a '$'. If it is not set, the function will skip any
 749  *                   data packets (if they are encountered), until a reply
 750  *                   has been fully parsed. If no more data is available
 751  *                   without parsing a reply, it will return an error.
 752  *
 753  * @returns 1 if a data packets is ready to be received, -1 on error,
 754  *          and 0 on success.
 755  */
 756 static int
 757 rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
 758                  unsigned char **content_ptr, int return_on_interleaved_data)
 759 {
 760     RTSPState *rt = s->priv_data;
 761     char buf[4096], buf1[1024], *q;
 762     unsigned char ch;
 763     const char *p;
 764     int ret, content_length, line_count = 0;
 765     unsigned char *content = NULL;
 766
 767     memset(reply, 0, sizeof(*reply));
 768
 769     /* parse reply (XXX: use buffers) */
 770     rt->last_reply[0] = '\0';
 771     for(;;) {
 772         q = buf;
 773         for(;;) {
 774             ret = url_read_complete(rt->rtsp_hd, &ch, 1);
 775 #ifdef DEBUG_RTP_TCP
 776             dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
 777 #endif
 778             if (ret != 1)
 779                 return -1;
 780             if (ch == '\n')
 781                 break;
 782             if (ch == '$') {
 783                 /* XXX: only parse it if first char on line ? */
 784                 if (return_on_interleaved_data) {
 785                     return 1;
 786                 } else
 787                 rtsp_skip_packet(s);
 788             } else if (ch != '\r') {
 789                 if ((q - buf) < sizeof(buf) - 1)
 790                     *q++ = ch;
 791             }
 792         }
 793         *q = '\0';
 794
 795         dprintf(s, "line='%s'\n", buf);
 796
 797         /* test if last line */
 798         if (buf[0] == '\0')
 799             break;
 800         p = buf;
 801         if (line_count == 0) {
 802             /* get reply code */
 803             get_word(buf1, sizeof(buf1), &p);
 804             get_word(buf1, sizeof(buf1), &p);
 805             reply->status_code = atoi(buf1);
 806         } else {
 807             rtsp_parse_line(reply, p);
 808             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 809             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 810         }
 811         line_count++;
 812     }
 813
 814     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 815         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 816
 817     content_length = reply->content_length;
 818     if (content_length > 0) {
 819         /* leave some room for a trailing '\0' (useful for simple parsing) */
 820         content = av_malloc(content_length + 1);
 821         (void)url_read_complete(rt->rtsp_hd, content, content_length);
 822         content[content_length] = '\0';
 823     }
 824     if (content_ptr)
 825         *content_ptr = content;
 826     else
 827         av_free(content);
 828
 829     /* EOS */
 830     if (reply->notice == 2101 /* End-of-Stream Reached */      ||
 831         reply->notice == 2104 /* Start-of-Stream Reached */    ||
 832         reply->notice == 2306 /* Continuous Feed Terminated */)
 833         rt->state = RTSP_STATE_IDLE;
 834     else if (reply->notice >= 4400 && reply->notice < 5500)
 835         return AVERROR(EIO); /* data or server error */
 836     else if (reply->notice == 2401 /* Ticket Expired */ ||
 837              (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
 838         return AVERROR(EPERM);
 839
 840     return 0;
 841 }
 842
 843 static void rtsp_send_cmd_async (AVFormatContext *s,
 844                           const char *cmd, RTSPMessageHeader *reply,
 845                           unsigned char **content_ptr)
 846 {
 847     RTSPState *rt = s->priv_data;
 848     char buf[4096], buf1[1024];
 849
 850     rt->seq++;
 851     av_strlcpy(buf, cmd, sizeof(buf));
 852     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 853     av_strlcat(buf, buf1, sizeof(buf));
 854     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 855         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 856         av_strlcat(buf, buf1, sizeof(buf));
 857     }
 858     av_strlcat(buf, "\r\n", sizeof(buf));
 859
 860     dprintf(s, "Sending:\n%s--\n", buf);
 861
 862     url_write(rt->rtsp_hd, buf, strlen(buf));
 863     rt->last_cmd_time = av_gettime();
 864 }
 865
 866 static void rtsp_send_cmd (AVFormatContext *s,
 867                            const char *cmd, RTSPMessageHeader *reply,
 868                            unsigned char **content_ptr)
 869 {
 870     rtsp_send_cmd_async(s, cmd, reply, content_ptr);
 871
 872     rtsp_read_reply(s, reply, content_ptr, 0);
 873 }
 874
 875
 876 /* close and free RTSP streams */
 877 static void rtsp_close_streams(RTSPState *rt)
 878 {
 879     int i;
 880     RTSPStream *rtsp_st;
 881
 882     for(i=0;i<rt->nb_rtsp_streams;i++) {
 883         rtsp_st = rt->rtsp_streams[i];
 884         if (rtsp_st) {
 885             if (rtsp_st->transport_priv) {
 886                 if (rt->transport == RTSP_TRANSPORT_RDT)
 887                     ff_rdt_parse_close(rtsp_st->transport_priv);
 888                 else
 889                     rtp_parse_close(rtsp_st->transport_priv);
 890             }
 891             if (rtsp_st->rtp_handle)
 892                 url_close(rtsp_st->rtp_handle);
 893             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 894                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 895         }
 896     }
 897     av_free(rt->rtsp_streams);
 898     if (rt->asf_ctx) {
 899         av_close_input_stream (rt->asf_ctx);
 900         rt->asf_ctx = NULL;
 901     }
 902 }
 903
 904 static int
 905 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 906 {
 907     RTSPState *rt = s->priv_data;
 908     AVStream *st = NULL;
 909
 910     /* open the RTP context */
 911     if (rtsp_st->stream_index >= 0)
 912         st = s->streams[rtsp_st->stream_index];
 913     if (!st)
 914         s->ctx_flags |= AVFMTCTX_NOHEADER;
 915
 916     if (rt->transport == RTSP_TRANSPORT_RDT)
 917         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 918                                             rtsp_st->dynamic_protocol_context,
 919                                             rtsp_st->dynamic_handler);
 920     else
 921         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 922                                          rtsp_st->sdp_payload_type,
 923                                          &rtsp_st->rtp_payload_data);
 924
 925     if (!rtsp_st->transport_priv) {
 926          return AVERROR(ENOMEM);
 927     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 928         if(rtsp_st->dynamic_handler) {
 929             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 930                                            rtsp_st->dynamic_protocol_context,
 931                                            rtsp_st->dynamic_handler);
 932         }
 933     }
 934
 935     return 0;
 936 }
 937
 938 /**
 939  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 940  */
 941 static int
 942 make_setup_request (AVFormatContext *s, const char *host, int port,
 943                     int lower_transport, const char *real_challenge)
 944 {
 945     RTSPState *rt = s->priv_data;
 946     int rtx, j, i, err, interleave = 0;
 947     RTSPStream *rtsp_st;
 948     RTSPMessageHeader reply1, *reply = &reply1;
 949     char cmd[2048];
 950     const char *trans_pref;
 951
 952     if (rt->transport == RTSP_TRANSPORT_RDT)
 953         trans_pref = "x-pn-tng";
 954     else
 955         trans_pref = "RTP/AVP";
 956
 957     /* default timeout: 1 minute */
 958     rt->timeout = 60;
 959
 960     /* for each stream, make the setup request */
 961     /* XXX: we assume the same server is used for the control of each
 962        RTSP stream */
 963
 964     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 965         char transport[2048];
 966
 967         /**
 968          * WMS serves all UDP data over a single connection, the RTX, which
 969          * isn't necessarily the first in the SDP but has to be the first
 970          * to be set up, else the second/third SETUP will fail with a 461.
 971          */
 972         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 973              rt->server_type == RTSP_SERVER_WMS) {
 974             if (i == 0) {
 975                 /* rtx first */
 976                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
 977                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
 978                     if (len >= 4 &&
 979                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
 980                         break;
 981                 }
 982                 if (rtx == rt->nb_rtsp_streams)
 983                     return -1; /* no RTX found */
 984                 rtsp_st = rt->rtsp_streams[rtx];
 985             } else
 986                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
 987         } else
 988             rtsp_st = rt->rtsp_streams[i];
 989
 990         /* RTP/UDP */
 991         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 992             char buf[256];
 993
 994             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
 995                 port = reply->transports[0].client_port_min;
 996                 goto have_port;
 997             }
 998
 999             /* first try in specified port range */
1000             if (RTSP_RTP_PORT_MIN != 0) {
1001                 while(j <= RTSP_RTP_PORT_MAX) {
1002                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
1003                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
1004                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
1005                         goto rtp_opened;
1006                     }
1007                 }
1008             }
1009
1010 /*            then try on any port
1011 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1012 **                err = AVERROR_INVALIDDATA;
1013 **                goto fail;
1014 **            }
1015 */
1016
1017         rtp_opened:
1018             port = rtp_get_local_port(rtsp_st->rtp_handle);
1019         have_port:
1020             snprintf(transport, sizeof(transport) - 1,
1021                      "%s/UDP;", trans_pref);
1022             if (rt->server_type != RTSP_SERVER_REAL)
1023                 av_strlcat(transport, "unicast;", sizeof(transport));
1024             av_strlcatf(transport, sizeof(transport),
1025                      "client_port=%d", port);
1026             if (rt->transport == RTSP_TRANSPORT_RTP &&
1027                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1028                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1029         }
1030
1031         /* RTP/TCP */
1032         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1033             /** For WMS streams, the application streams are only used for
1034              * UDP. When trying to set it up for TCP streams, the server
1035              * will return an error. Therefore, we skip those streams. */
1036             if (rt->server_type == RTSP_SERVER_WMS &&
1037                 s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
1038                 continue;
1039             snprintf(transport, sizeof(transport) - 1,
1040                      "%s/TCP;", trans_pref);
1041             if (rt->server_type == RTSP_SERVER_WMS)
1042                 av_strlcat(transport, "unicast;", sizeof(transport));
1043             av_strlcatf(transport, sizeof(transport),
1044                         "interleaved=%d-%d",
1045                         interleave, interleave + 1);
1046             interleave += 2;
1047         }
1048
1049         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1050             snprintf(transport, sizeof(transport) - 1,
1051                      "%s/UDP;multicast", trans_pref);
1052         }
1053         if (rt->server_type == RTSP_SERVER_REAL ||
1054             rt->server_type == RTSP_SERVER_WMS)
1055             av_strlcat(transport, ";mode=play", sizeof(transport));
1056         snprintf(cmd, sizeof(cmd),
1057                  "SETUP %s RTSP/1.0\r\n"
1058                  "Transport: %s\r\n",
1059                  rtsp_st->control_url, transport);
1060         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1061             char real_res[41], real_csum[9];
1062             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1063                                               real_challenge);
1064             av_strlcatf(cmd, sizeof(cmd),
1065                         "If-Match: %s\r\n"
1066                         "RealChallenge2: %s, sd=%s\r\n",
1067                         rt->session_id, real_res, real_csum);
1068         }
1069         rtsp_send_cmd(s, cmd, reply, NULL);
1070         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1071             err = 1;
1072             goto fail;
1073         } else if (reply->status_code != RTSP_STATUS_OK ||
1074                    reply->nb_transports != 1) {
1075             err = AVERROR_INVALIDDATA;
1076             goto fail;
1077         }
1078
1079         /* XXX: same protocol for all streams is required */
1080         if (i > 0) {
1081             if (reply->transports[0].lower_transport != rt->lower_transport ||
1082                 reply->transports[0].transport != rt->transport) {
1083                 err = AVERROR_INVALIDDATA;
1084                 goto fail;
1085             }
1086         } else {
1087             rt->lower_transport = reply->transports[0].lower_transport;
1088             rt->transport = reply->transports[0].transport;
1089         }
1090
1091         /* close RTP connection if not choosen */
1092         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1093             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1094             url_close(rtsp_st->rtp_handle);
1095             rtsp_st->rtp_handle = NULL;
1096         }
1097
1098         switch(reply->transports[0].lower_transport) {
1099         case RTSP_LOWER_TRANSPORT_TCP:
1100             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1101             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1102             break;
1103
1104         case RTSP_LOWER_TRANSPORT_UDP:
1105             {
1106                 char url[1024];
1107
1108                 /* XXX: also use address if specified */
1109                 snprintf(url, sizeof(url), "rtp://%s:%d",
1110                          host, reply->transports[0].server_port_min);
1111                 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1112                     rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1113                     err = AVERROR_INVALIDDATA;
1114                     goto fail;
1115                 }
1116             }
1117             break;
1118         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1119             {
1120                 char url[1024];
1121                 struct in_addr in;
1122
1123                 in.s_addr = htonl(reply->transports[0].destination);
1124                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1125                          inet_ntoa(in),
1126                          reply->transports[0].port_min,
1127                          reply->transports[0].ttl);
1128                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1129                     err = AVERROR_INVALIDDATA;
1130                     goto fail;
1131                 }
1132             }
1133             break;
1134         }
1135
1136         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1137             goto fail;
1138     }
1139
1140     if (reply->timeout > 0)
1141         rt->timeout = reply->timeout;
1142
1143     if (rt->server_type == RTSP_SERVER_REAL)
1144         rt->need_subscription = 1;
1145
1146     return 0;
1147
1148 fail:
1149     for (i=0; i<rt->nb_rtsp_streams; i++) {
1150         if (rt->rtsp_streams[i]->rtp_handle) {
1151             url_close(rt->rtsp_streams[i]->rtp_handle);
1152             rt->rtsp_streams[i]->rtp_handle = NULL;
1153         }
1154     }
1155     return err;
1156 }
1157
1158 static int rtsp_read_header(AVFormatContext *s,
1159                             AVFormatParameters *ap)
1160 {
1161     RTSPState *rt = s->priv_data;
1162     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1163     URLContext *rtsp_hd;
1164     int port, ret, err;
1165     RTSPMessageHeader reply1, *reply = &reply1;
1166     unsigned char *content = NULL;
1167     int lower_transport_mask = 0;
1168     char real_challenge[64];
1169
1170     /* extract hostname and port */
1171     url_split(NULL, 0, NULL, 0,
1172               host, sizeof(host), &port, path, sizeof(path), s->filename);
1173     if (port < 0)
1174         port = RTSP_DEFAULT_PORT;
1175
1176     /* search for options */
1177     option_list = strchr(path, '?');
1178     if (option_list) {
1179         /* remove the options from the path */
1180         *option_list++ = 0;
1181         while(option_list) {
1182             /* move the option pointer */
1183             option = option_list;
1184             option_list = strchr(option_list, '&');
1185             if (option_list)
1186                 *(option_list++) = 0;
1187             /* handle the options */
1188             if (strcmp(option, "udp") == 0)
1189                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1190             else if (strcmp(option, "multicast") == 0)
1191                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1192             else if (strcmp(option, "tcp") == 0)
1193                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1194         }
1195     }
1196
1197     if (!lower_transport_mask)
1198         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1199
1200     /* open the tcp connexion */
1201     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1202     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1203         return AVERROR(EIO);
1204     rt->rtsp_hd = rtsp_hd;
1205     rt->seq = 0;
1206
1207     /* request options supported by the server; this also detects server type */
1208     for (rt->server_type = RTSP_SERVER_RTP;;) {
1209         snprintf(cmd, sizeof(cmd),
1210                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1211         if (rt->server_type == RTSP_SERVER_REAL)
1212             av_strlcat(cmd,
1213                        /**
1214                         * The following entries are required for proper
1215                         * streaming from a Realmedia server. They are
1216                         * interdependent in some way although we currently
1217                         * don't quite understand how. Values were copied
1218                         * from mplayer SVN r23589.
1219                         * @param CompanyID is a 16-byte ID in base64
1220                         * @param ClientChallenge is a 16-byte ID in hex
1221                         */
1222                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1223                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1224                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1225                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1226                        sizeof(cmd));
1227         rtsp_send_cmd(s, cmd, reply, NULL);
1228         if (reply->status_code != RTSP_STATUS_OK) {
1229             err = AVERROR_INVALIDDATA;
1230             goto fail;
1231         }
1232
1233         /* detect server type if not standard-compliant RTP */
1234         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1235             rt->server_type = RTSP_SERVER_REAL;
1236             continue;
1237         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1238             rt->server_type = RTSP_SERVER_WMS;
1239         } else if (rt->server_type == RTSP_SERVER_REAL) {
1240             strcpy(real_challenge, reply->real_challenge);
1241         }
1242         break;
1243     }
1244
1245     /* describe the stream */
1246     snprintf(cmd, sizeof(cmd),
1247              "DESCRIBE %s RTSP/1.0\r\n"
1248              "Accept: application/sdp\r\n",
1249              s->filename);
1250     if (rt->server_type == RTSP_SERVER_REAL) {
1251         /**
1252          * The Require: attribute is needed for proper streaming from
1253          * Realmedia servers.
1254          */
1255         av_strlcat(cmd,
1256                    "Require: com.real.retain-entity-for-setup\r\n",
1257                    sizeof(cmd));
1258     }
1259     rtsp_send_cmd(s, cmd, reply, &content);
1260     if (!content) {
1261         err = AVERROR_INVALIDDATA;
1262         goto fail;
1263     }
1264     if (reply->status_code != RTSP_STATUS_OK) {
1265         err = AVERROR_INVALIDDATA;
1266         goto fail;
1267     }
1268
1269     /* now we got the SDP description, we parse it */
1270     ret = sdp_parse(s, (const char *)content);
1271     av_freep(&content);
1272     if (ret < 0) {
1273         err = AVERROR_INVALIDDATA;
1274         goto fail;
1275     }
1276
1277     do {
1278         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1279
1280         err = make_setup_request(s, host, port, lower_transport,
1281                                  rt->server_type == RTSP_SERVER_REAL ?
1282                                      real_challenge : NULL);
1283         if (err < 0)
1284             goto fail;
1285         lower_transport_mask &= ~(1 << lower_transport);
1286         if (lower_transport_mask == 0 && err == 1) {
1287             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1288             goto fail;
1289         }
1290     } while (err);
1291
1292     rt->state = RTSP_STATE_IDLE;
1293     rt->seek_timestamp = 0; /* default is to start stream at position
1294                                zero */
1295     if (ap->initial_pause) {
1296         /* do not start immediately */
1297     } else {
1298         if (rtsp_read_play(s) < 0) {
1299             err = AVERROR_INVALIDDATA;
1300             goto fail;
1301         }
1302     }
1303     return 0;
1304  fail:
1305     rtsp_close_streams(rt);
1306     av_freep(&content);
1307     url_close(rt->rtsp_hd);
1308     return err;
1309 }
1310
1311 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1312                            uint8_t *buf, int buf_size)
1313 {
1314     RTSPState *rt = s->priv_data;
1315     int id, len, i, ret;
1316     RTSPStream *rtsp_st;
1317
1318 #ifdef DEBUG_RTP_TCP
1319     dprintf(s, "tcp_read_packet:\n");
1320 #endif
1321  redo:
1322     for(;;) {
1323         RTSPMessageHeader reply;
1324
1325         ret = rtsp_read_reply(s, &reply, NULL, 1);
1326         if (ret == -1)
1327             return -1;
1328         if (ret == 1) /* received '$' */
1329             break;
1330         /* XXX: parse message */
1331         if (rt->state != RTSP_STATE_PLAYING)
1332             return 0;
1333     }
1334     ret = url_read_complete(rt->rtsp_hd, buf, 3);
1335     if (ret != 3)
1336         return -1;
1337     id = buf[0];
1338     len = AV_RB16(buf + 1);
1339 #ifdef DEBUG_RTP_TCP
1340     dprintf(s, "id=%d len=%d\n", id, len);
1341 #endif
1342     if (len > buf_size || len < 12)
1343         goto redo;
1344     /* get the data */
1345     ret = url_read_complete(rt->rtsp_hd, buf, len);
1346     if (ret != len)
1347         return -1;
1348     if (rt->transport == RTSP_TRANSPORT_RDT &&
1349         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1350         return -1;
1351
1352     /* find the matching stream */
1353     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1354         rtsp_st = rt->rtsp_streams[i];
1355         if (id >= rtsp_st->interleaved_min &&
1356             id <= rtsp_st->interleaved_max)
1357             goto found;
1358     }
1359     goto redo;
1360  found:
1361     *prtsp_st = rtsp_st;
1362     return len;
1363 }
1364
1365 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1366                            uint8_t *buf, int buf_size)
1367 {
1368     RTSPState *rt = s->priv_data;
1369     RTSPStream *rtsp_st;
1370     fd_set rfds;
1371     int fd, fd_max, n, i, ret, tcp_fd;
1372     struct timeval tv;
1373
1374     for(;;) {
1375         if (url_interrupt_cb())
1376             return AVERROR(EINTR);
1377         FD_ZERO(&rfds);
1378         if (rt->rtsp_hd) {
1379             tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1380             FD_SET(tcp_fd, &rfds);
1381         } else {
1382             fd_max = 0;
1383             tcp_fd = -1;
1384         }
1385         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1386             rtsp_st = rt->rtsp_streams[i];
1387             if (rtsp_st->rtp_handle) {
1388                 /* currently, we cannot probe RTCP handle because of
1389                  * blocking restrictions */
1390                 fd = url_get_file_handle(rtsp_st->rtp_handle);
1391                 if (fd > fd_max)
1392                     fd_max = fd;
1393                 FD_SET(fd, &rfds);
1394             }
1395         }
1396         tv.tv_sec = 0;
1397         tv.tv_usec = 100 * 1000;
1398         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1399         if (n > 0) {
1400             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1401                 rtsp_st = rt->rtsp_streams[i];
1402                 if (rtsp_st->rtp_handle) {
1403                     fd = url_get_file_handle(rtsp_st->rtp_handle);
1404                     if (FD_ISSET(fd, &rfds)) {
1405                         ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1406                         if (ret > 0) {
1407                             *prtsp_st = rtsp_st;
1408                             return ret;
1409                         }
1410                     }
1411                 }
1412             }
1413             if (FD_ISSET(tcp_fd, &rfds)) {
1414                 RTSPMessageHeader reply;
1415
1416                 rtsp_read_reply(s, &reply, NULL, 0);
1417                 /* XXX: parse message */
1418                 if (rt->state != RTSP_STATE_PLAYING)
1419                     return 0;
1420             }
1421         }
1422     }
1423 }
1424
1425 static int rtsp_read_packet(AVFormatContext *s,
1426                             AVPacket *pkt)
1427 {
1428     RTSPState *rt = s->priv_data;
1429     RTSPStream *rtsp_st;
1430     int ret, len;
1431     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1432     RTSPMessageHeader reply1, *reply = &reply1;
1433     char cmd[1024];
1434
1435     if (rt->server_type == RTSP_SERVER_REAL) {
1436         int i;
1437         enum AVDiscard cache[MAX_STREAMS];
1438
1439         for (i = 0; i < s->nb_streams; i++)
1440             cache[i] = s->streams[i]->discard;
1441
1442         if (!rt->need_subscription) {
1443             if (memcmp (cache, rt->real_setup_cache,
1444                         sizeof(enum AVDiscard) * s->nb_streams)) {
1445                 av_strlcatf(cmd, sizeof(cmd),
1446                             "SET_PARAMETER %s RTSP/1.0\r\n"
1447                             "Unsubscribe: %s\r\n",
1448                             s->filename, rt->last_subscription);
1449                 rtsp_send_cmd(s, cmd, reply, NULL);
1450                 if (reply->status_code != RTSP_STATUS_OK)
1451                     return AVERROR_INVALIDDATA;
1452                 rt->need_subscription = 1;
1453             }
1454         }
1455
1456         if (rt->need_subscription) {
1457             int r, rule_nr, first = 1;
1458
1459             memcpy(rt->real_setup_cache, cache,
1460                    sizeof(enum AVDiscard) * s->nb_streams);
1461             rt->last_subscription[0] = 0;
1462
1463             snprintf(cmd, sizeof(cmd),
1464                      "SET_PARAMETER %s RTSP/1.0\r\n"
1465                      "Subscribe: ",
1466                      s->filename);
1467             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1468                 rule_nr = 0;
1469                 for (r = 0; r < s->nb_streams; r++) {
1470                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1471                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1472                             if (!first)
1473                                 av_strlcat(rt->last_subscription, ",",
1474                                            sizeof(rt->last_subscription));
1475                             ff_rdt_subscribe_rule(
1476                                 rt->last_subscription,
1477                                 sizeof(rt->last_subscription), i, rule_nr);
1478                             first = 0;
1479                         }
1480                         rule_nr++;
1481                     }
1482                 }
1483             }
1484             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1485             rtsp_send_cmd(s, cmd, reply, NULL);
1486             if (reply->status_code != RTSP_STATUS_OK)
1487                 return AVERROR_INVALIDDATA;
1488             rt->need_subscription = 0;
1489
1490             if (rt->state == RTSP_STATE_PLAYING)
1491                 rtsp_read_play (s);
1492         }
1493     }
1494
1495     /* get next frames from the same RTP packet */
1496     if (rt->cur_transport_priv) {
1497         if (rt->transport == RTSP_TRANSPORT_RDT)
1498             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1499         else
1500             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1501         if (ret == 0) {
1502             rt->cur_transport_priv = NULL;
1503             return 0;
1504         } else if (ret == 1) {
1505             return 0;
1506         } else {
1507             rt->cur_transport_priv = NULL;
1508         }
1509     }
1510
1511     /* read next RTP packet */
1512  redo:
1513     switch(rt->lower_transport) {
1514     default:
1515     case RTSP_LOWER_TRANSPORT_TCP:
1516         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1517         break;
1518     case RTSP_LOWER_TRANSPORT_UDP:
1519     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1520         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1521         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1522             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1523         break;
1524     }
1525     if (len < 0)
1526         return len;
1527     if (len == 0)
1528         return AVERROR_EOF;
1529     if (rt->transport == RTSP_TRANSPORT_RDT)
1530         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1531     else
1532         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1533     if (ret < 0)
1534         goto redo;
1535     if (ret == 1) {
1536         /* more packets may follow, so we save the RTP context */
1537         rt->cur_transport_priv = rtsp_st->transport_priv;
1538     }
1539
1540     /* send dummy request to keep TCP connection alive */
1541     if ((rt->server_type == RTSP_SERVER_WMS ||
1542          rt->server_type == RTSP_SERVER_REAL) &&
1543         (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1544         if (rt->server_type == RTSP_SERVER_WMS) {
1545             snprintf(cmd, sizeof(cmd) - 1,
1546                      "GET_PARAMETER %s RTSP/1.0\r\n",
1547                      s->filename);
1548             rtsp_send_cmd_async(s, cmd, reply, NULL);
1549         } else {
1550             rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n",
1551                                 reply, NULL);
1552         }
1553     }
1554
1555     return 0;
1556 }
1557
1558 static int rtsp_read_play(AVFormatContext *s)
1559 {
1560     RTSPState *rt = s->priv_data;
1561     RTSPMessageHeader reply1, *reply = &reply1;
1562     char cmd[1024];
1563
1564     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1565
1566     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1567         if (rt->state == RTSP_STATE_PAUSED) {
1568             snprintf(cmd, sizeof(cmd),
1569                      "PLAY %s RTSP/1.0\r\n",
1570                      s->filename);
1571         } else {
1572             snprintf(cmd, sizeof(cmd),
1573                      "PLAY %s RTSP/1.0\r\n"
1574                      "Range: npt=%0.3f-\r\n",
1575                      s->filename,
1576                      (double)rt->seek_timestamp / AV_TIME_BASE);
1577         }
1578         rtsp_send_cmd(s, cmd, reply, NULL);
1579         if (reply->status_code != RTSP_STATUS_OK) {
1580             return -1;
1581         }
1582     }
1583     rt->state = RTSP_STATE_PLAYING;
1584     return 0;
1585 }
1586
1587 /* pause the stream */
1588 static int rtsp_read_pause(AVFormatContext *s)
1589 {
1590     RTSPState *rt = s->priv_data;
1591     RTSPMessageHeader reply1, *reply = &reply1;
1592     char cmd[1024];
1593
1594     rt = s->priv_data;
1595
1596     if (rt->state != RTSP_STATE_PLAYING)
1597         return 0;
1598     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1599         snprintf(cmd, sizeof(cmd),
1600                  "PAUSE %s RTSP/1.0\r\n",
1601                  s->filename);
1602         rtsp_send_cmd(s, cmd, reply, NULL);
1603         if (reply->status_code != RTSP_STATUS_OK) {
1604             return -1;
1605         }
1606     }
1607     rt->state = RTSP_STATE_PAUSED;
1608     return 0;
1609 }
1610
1611 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1612                           int64_t timestamp, int flags)
1613 {
1614     RTSPState *rt = s->priv_data;
1615
1616     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1617     switch(rt->state) {
1618     default:
1619     case RTSP_STATE_IDLE:
1620         break;
1621     case RTSP_STATE_PLAYING:
1622         if (rtsp_read_pause(s) != 0)
1623             return -1;
1624         rt->state = RTSP_STATE_SEEKING;
1625         if (rtsp_read_play(s) != 0)
1626             return -1;
1627         break;
1628     case RTSP_STATE_PAUSED:
1629         rt->state = RTSP_STATE_IDLE;
1630         break;
1631     }
1632     return 0;
1633 }
1634
1635 static int rtsp_read_close(AVFormatContext *s)
1636 {
1637     RTSPState *rt = s->priv_data;
1638     RTSPMessageHeader reply1, *reply = &reply1;
1639     char cmd[1024];
1640
1641 #if 0
1642     /* NOTE: it is valid to flush the buffer here */
1643     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1644         url_fclose(&rt->rtsp_gb);
1645     }
1646 #endif
1647     snprintf(cmd, sizeof(cmd),
1648              "TEARDOWN %s RTSP/1.0\r\n",
1649              s->filename);
1650     rtsp_send_cmd(s, cmd, reply, NULL);
1651
1652     rtsp_close_streams(rt);
1653     url_close(rt->rtsp_hd);
1654     return 0;
1655 }
1656
1657 #if CONFIG_RTSP_DEMUXER
1658 AVInputFormat rtsp_demuxer = {
1659     "rtsp",
1660     NULL_IF_CONFIG_SMALL("RTSP input format"),
1661     sizeof(RTSPState),
1662     rtsp_probe,
1663     rtsp_read_header,
1664     rtsp_read_packet,
1665     rtsp_read_close,
1666     rtsp_read_seek,
1667     .flags = AVFMT_NOFILE,
1668     .read_play = rtsp_read_play,
1669     .read_pause = rtsp_read_pause,
1670 };
1671 #endif
1672
1673 static int sdp_probe(AVProbeData *p1)
1674 {
1675     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1676
1677     /* we look for a line beginning "c=IN IP4" */
1678     while (p < p_end && *p != '\0') {
1679         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1680             return AVPROBE_SCORE_MAX / 2;
1681
1682         while(p < p_end - 1 && *p != '\n') p++;
1683         if (++p >= p_end)
1684             break;
1685         if (*p == '\r')
1686             p++;
1687     }
1688     return 0;
1689 }
1690
1691 #define SDP_MAX_SIZE 8192
1692
1693 static int sdp_read_header(AVFormatContext *s,
1694                            AVFormatParameters *ap)
1695 {
1696     RTSPState *rt = s->priv_data;
1697     RTSPStream *rtsp_st;
1698     int size, i, err;
1699     char *content;
1700     char url[1024];
1701
1702     /* read the whole sdp file */
1703     /* XXX: better loading */
1704     content = av_malloc(SDP_MAX_SIZE);
1705     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1706     if (size <= 0) {
1707         av_free(content);
1708         return AVERROR_INVALIDDATA;
1709     }
1710     content[size] ='\0';
1711
1712     sdp_parse(s, content);
1713     av_free(content);
1714
1715     /* open each RTP stream */
1716     for(i=0;i<rt->nb_rtsp_streams;i++) {
1717         rtsp_st = rt->rtsp_streams[i];
1718
1719         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1720                  inet_ntoa(rtsp_st->sdp_ip),
1721                  rtsp_st->sdp_port,
1722                  rtsp_st->sdp_port,
1723                  rtsp_st->sdp_ttl);
1724         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1725             err = AVERROR_INVALIDDATA;
1726             goto fail;
1727         }
1728         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1729             goto fail;
1730     }
1731     return 0;
1732  fail:
1733     rtsp_close_streams(rt);
1734     return err;
1735 }
1736
1737 static int sdp_read_packet(AVFormatContext *s,
1738                             AVPacket *pkt)
1739 {
1740     return rtsp_read_packet(s, pkt);
1741 }
1742
1743 static int sdp_read_close(AVFormatContext *s)
1744 {
1745     RTSPState *rt = s->priv_data;
1746     rtsp_close_streams(rt);
1747     return 0;
1748 }
1749
1750 #if CONFIG_SDP_DEMUXER
1751 AVInputFormat sdp_demuxer = {
1752     "sdp",
1753     NULL_IF_CONFIG_SMALL("SDP"),
1754     sizeof(RTSPState),
1755     sdp_probe,
1756     sdp_read_header,
1757     sdp_read_packet,
1758     sdp_read_close,
1759 };
1760 #endif
1761
1762 #if CONFIG_REDIR_DEMUXER
1763 /* dummy redirector format (used directly in av_open_input_file now) */
1764 static int redir_probe(AVProbeData *pd)
1765 {
1766     const char *p;
1767     p = pd->buf;
1768     skip_spaces(&p);
1769     if (av_strstart(p, "http://", NULL) ||
1770         av_strstart(p, "rtsp://", NULL))
1771         return AVPROBE_SCORE_MAX;
1772     return 0;
1773 }
1774
1775 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1776 {
1777     char buf[4096], *q;
1778     int c;
1779     AVFormatContext *ic = NULL;
1780     ByteIOContext *f = s->pb;
1781
1782     /* parse each URL and try to open it */
1783     c = url_fgetc(f);
1784     while (c != URL_EOF) {
1785         /* skip spaces */
1786         for(;;) {
1787             if (!redir_isspace(c))
1788                 break;
1789             c = url_fgetc(f);
1790         }
1791         if (c == URL_EOF)
1792             break;
1793         /* record url */
1794         q = buf;
1795         for(;;) {
1796             if (c == URL_EOF || redir_isspace(c))
1797                 break;
1798             if ((q - buf) < sizeof(buf) - 1)
1799                 *q++ = c;
1800             c = url_fgetc(f);
1801         }
1802         *q = '\0';
1803         //printf("URL='%s'\n", buf);
1804         /* try to open the media file */
1805         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1806             break;
1807     }
1808     if (!ic)
1809         return AVERROR(EIO);
1810
1811     *s = *ic;
1812     url_fclose(f);
1813
1814     return 0;
1815 }
1816
1817 AVInputFormat redir_demuxer = {
1818     "redir",
1819     NULL_IF_CONFIG_SMALL("Redirector format"),
1820     0,
1821     redir_probe,
1822     redir_read_header,
1823     NULL,
1824     NULL,
1825 };
1826 #endif