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     }
 704 }
 705
 706 /* skip a RTP/TCP interleaved packet */
 707 static void rtsp_skip_packet(AVFormatContext *s)
 708 {
 709     RTSPState *rt = s->priv_data;
 710     int ret, len, len1;
 711     uint8_t buf[1024];
 712
 713     ret = url_read_complete(rt->rtsp_hd, buf, 3);
 714     if (ret != 3)
 715         return;
 716     len = AV_RB16(buf + 1);
 717
 718     dprintf(s, "skipping RTP packet len=%d\n", len);
 719
 720     /* skip payload */
 721     while (len > 0) {
 722         len1 = len;
 723         if (len1 > sizeof(buf))
 724             len1 = sizeof(buf);
 725         ret = url_read_complete(rt->rtsp_hd, buf, len1);
 726         if (ret != len1)
 727             return;
 728         len -= len1;
 729     }
 730 }
 731
 732 /**
 733  * Read a RTSP message from the server, or prepare to read data
 734  * packets if we're reading data interleaved over the TCP/RTSP
 735  * connection as well.
 736  *
 737  * @param s RTSP demuxer context
 738  * @param reply pointer where the RTSP message header will be stored
 739  * @param content_ptr pointer where the RTSP message body, if any, will
 740  *                    be stored (length is in \p reply)
 741  * @param return_on_interleaved_data whether the function may return if we
 742  *                   encounter a data marker ('$'), which precedes data
 743  *                   packets over interleaved TCP/RTSP connections. If this
 744  *                   is set, this function will return 1 after encountering
 745  *                   a '$'. If it is not set, the function will skip any
 746  *                   data packets (if they are encountered), until a reply
 747  *                   has been fully parsed. If no more data is available
 748  *                   without parsing a reply, it will return an error.
 749  *
 750  * @returns 1 if a data packets is ready to be received, -1 on error,
 751  *          and 0 on success.
 752  */
 753 static int
 754 rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
 755                  unsigned char **content_ptr, int return_on_interleaved_data)
 756 {
 757     RTSPState *rt = s->priv_data;
 758     char buf[4096], buf1[1024], *q;
 759     unsigned char ch;
 760     const char *p;
 761     int ret, content_length, line_count = 0;
 762     unsigned char *content = NULL;
 763
 764     memset(reply, 0, sizeof(*reply));
 765
 766     /* parse reply (XXX: use buffers) */
 767     rt->last_reply[0] = '\0';
 768     for(;;) {
 769         q = buf;
 770         for(;;) {
 771             ret = url_read_complete(rt->rtsp_hd, &ch, 1);
 772 #ifdef DEBUG_RTP_TCP
 773             dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
 774 #endif
 775             if (ret != 1)
 776                 return -1;
 777             if (ch == '\n')
 778                 break;
 779             if (ch == '$') {
 780                 /* XXX: only parse it if first char on line ? */
 781                 if (return_on_interleaved_data) {
 782                     return 1;
 783                 } else
 784                 rtsp_skip_packet(s);
 785             } else if (ch != '\r') {
 786                 if ((q - buf) < sizeof(buf) - 1)
 787                     *q++ = ch;
 788             }
 789         }
 790         *q = '\0';
 791
 792         dprintf(s, "line='%s'\n", buf);
 793
 794         /* test if last line */
 795         if (buf[0] == '\0')
 796             break;
 797         p = buf;
 798         if (line_count == 0) {
 799             /* get reply code */
 800             get_word(buf1, sizeof(buf1), &p);
 801             get_word(buf1, sizeof(buf1), &p);
 802             reply->status_code = atoi(buf1);
 803         } else {
 804             rtsp_parse_line(reply, p);
 805             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 806             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 807         }
 808         line_count++;
 809     }
 810
 811     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 812         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 813
 814     content_length = reply->content_length;
 815     if (content_length > 0) {
 816         /* leave some room for a trailing '\0' (useful for simple parsing) */
 817         content = av_malloc(content_length + 1);
 818         (void)url_read_complete(rt->rtsp_hd, content, content_length);
 819         content[content_length] = '\0';
 820     }
 821     if (content_ptr)
 822         *content_ptr = content;
 823     else
 824         av_free(content);
 825
 826     return 0;
 827 }
 828
 829 static void rtsp_send_cmd_async (AVFormatContext *s,
 830                           const char *cmd, RTSPMessageHeader *reply,
 831                           unsigned char **content_ptr)
 832 {
 833     RTSPState *rt = s->priv_data;
 834     char buf[4096], buf1[1024];
 835
 836     rt->seq++;
 837     av_strlcpy(buf, cmd, sizeof(buf));
 838     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 839     av_strlcat(buf, buf1, sizeof(buf));
 840     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 841         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 842         av_strlcat(buf, buf1, sizeof(buf));
 843     }
 844     av_strlcat(buf, "\r\n", sizeof(buf));
 845
 846     dprintf(s, "Sending:\n%s--\n", buf);
 847
 848     url_write(rt->rtsp_hd, buf, strlen(buf));
 849     rt->last_cmd_time = av_gettime();
 850 }
 851
 852 static void rtsp_send_cmd (AVFormatContext *s,
 853                            const char *cmd, RTSPMessageHeader *reply,
 854                            unsigned char **content_ptr)
 855 {
 856     rtsp_send_cmd_async(s, cmd, reply, content_ptr);
 857
 858     rtsp_read_reply(s, reply, content_ptr, 0);
 859 }
 860
 861
 862 /* close and free RTSP streams */
 863 static void rtsp_close_streams(RTSPState *rt)
 864 {
 865     int i;
 866     RTSPStream *rtsp_st;
 867
 868     for(i=0;i<rt->nb_rtsp_streams;i++) {
 869         rtsp_st = rt->rtsp_streams[i];
 870         if (rtsp_st) {
 871             if (rtsp_st->transport_priv) {
 872                 if (rt->transport == RTSP_TRANSPORT_RDT)
 873                     ff_rdt_parse_close(rtsp_st->transport_priv);
 874                 else
 875                     rtp_parse_close(rtsp_st->transport_priv);
 876             }
 877             if (rtsp_st->rtp_handle)
 878                 url_close(rtsp_st->rtp_handle);
 879             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 880                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 881         }
 882     }
 883     av_free(rt->rtsp_streams);
 884     if (rt->asf_ctx) {
 885         av_close_input_stream (rt->asf_ctx);
 886         rt->asf_ctx = NULL;
 887     }
 888 }
 889
 890 static int
 891 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 892 {
 893     RTSPState *rt = s->priv_data;
 894     AVStream *st = NULL;
 895
 896     /* open the RTP context */
 897     if (rtsp_st->stream_index >= 0)
 898         st = s->streams[rtsp_st->stream_index];
 899     if (!st)
 900         s->ctx_flags |= AVFMTCTX_NOHEADER;
 901
 902     if (rt->transport == RTSP_TRANSPORT_RDT)
 903         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 904                                             rtsp_st->dynamic_protocol_context,
 905                                             rtsp_st->dynamic_handler);
 906     else
 907         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 908                                          rtsp_st->sdp_payload_type,
 909                                          &rtsp_st->rtp_payload_data);
 910
 911     if (!rtsp_st->transport_priv) {
 912          return AVERROR(ENOMEM);
 913     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 914         if(rtsp_st->dynamic_handler) {
 915             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 916                                            rtsp_st->dynamic_protocol_context,
 917                                            rtsp_st->dynamic_handler);
 918         }
 919     }
 920
 921     return 0;
 922 }
 923
 924 /**
 925  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 926  */
 927 static int
 928 make_setup_request (AVFormatContext *s, const char *host, int port,
 929                     int lower_transport, const char *real_challenge)
 930 {
 931     RTSPState *rt = s->priv_data;
 932     int rtx, j, i, err, interleave = 0;
 933     RTSPStream *rtsp_st;
 934     RTSPMessageHeader reply1, *reply = &reply1;
 935     char cmd[2048];
 936     const char *trans_pref;
 937
 938     if (rt->transport == RTSP_TRANSPORT_RDT)
 939         trans_pref = "x-pn-tng";
 940     else
 941         trans_pref = "RTP/AVP";
 942
 943     /* default timeout: 1 minute */
 944     rt->timeout = 60;
 945
 946     /* for each stream, make the setup request */
 947     /* XXX: we assume the same server is used for the control of each
 948        RTSP stream */
 949
 950     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 951         char transport[2048];
 952
 953         /**
 954          * WMS serves all UDP data over a single connection, the RTX, which
 955          * isn't necessarily the first in the SDP but has to be the first
 956          * to be set up, else the second/third SETUP will fail with a 461.
 957          */
 958         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 959              rt->server_type == RTSP_SERVER_WMS) {
 960             if (i == 0) {
 961                 /* rtx first */
 962                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
 963                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
 964                     if (len >= 4 &&
 965                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
 966                         break;
 967                 }
 968                 if (rtx == rt->nb_rtsp_streams)
 969                     return -1; /* no RTX found */
 970                 rtsp_st = rt->rtsp_streams[rtx];
 971             } else
 972                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
 973         } else
 974             rtsp_st = rt->rtsp_streams[i];
 975
 976         /* RTP/UDP */
 977         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 978             char buf[256];
 979
 980             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
 981                 port = reply->transports[0].client_port_min;
 982                 goto have_port;
 983             }
 984
 985             /* first try in specified port range */
 986             if (RTSP_RTP_PORT_MIN != 0) {
 987                 while(j <= RTSP_RTP_PORT_MAX) {
 988                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 989                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 990                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 991                         goto rtp_opened;
 992                     }
 993                 }
 994             }
 995
 996 /*            then try on any port
 997 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 998 **                err = AVERROR_INVALIDDATA;
 999 **                goto fail;
1000 **            }
1001 */
1002
1003         rtp_opened:
1004             port = rtp_get_local_port(rtsp_st->rtp_handle);
1005         have_port:
1006             snprintf(transport, sizeof(transport) - 1,
1007                      "%s/UDP;", trans_pref);
1008             if (rt->server_type != RTSP_SERVER_REAL)
1009                 av_strlcat(transport, "unicast;", sizeof(transport));
1010             av_strlcatf(transport, sizeof(transport),
1011                      "client_port=%d", port);
1012             if (rt->transport == RTSP_TRANSPORT_RTP &&
1013                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1014                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1015         }
1016
1017         /* RTP/TCP */
1018         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1019             /** For WMS streams, the application streams are only used for
1020              * UDP. When trying to set it up for TCP streams, the server
1021              * will return an error. Therefore, we skip those streams. */
1022             if (rt->server_type == RTSP_SERVER_WMS &&
1023                 s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
1024                 continue;
1025             snprintf(transport, sizeof(transport) - 1,
1026                      "%s/TCP;", trans_pref);
1027             if (rt->server_type == RTSP_SERVER_WMS)
1028                 av_strlcat(transport, "unicast;", sizeof(transport));
1029             av_strlcatf(transport, sizeof(transport),
1030                         "interleaved=%d-%d",
1031                         interleave, interleave + 1);
1032             interleave += 2;
1033         }
1034
1035         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1036             snprintf(transport, sizeof(transport) - 1,
1037                      "%s/UDP;multicast", trans_pref);
1038         }
1039         if (rt->server_type == RTSP_SERVER_REAL ||
1040             rt->server_type == RTSP_SERVER_WMS)
1041             av_strlcat(transport, ";mode=play", sizeof(transport));
1042         snprintf(cmd, sizeof(cmd),
1043                  "SETUP %s RTSP/1.0\r\n"
1044                  "Transport: %s\r\n",
1045                  rtsp_st->control_url, transport);
1046         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1047             char real_res[41], real_csum[9];
1048             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1049                                               real_challenge);
1050             av_strlcatf(cmd, sizeof(cmd),
1051                         "If-Match: %s\r\n"
1052                         "RealChallenge2: %s, sd=%s\r\n",
1053                         rt->session_id, real_res, real_csum);
1054         }
1055         rtsp_send_cmd(s, cmd, reply, NULL);
1056         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1057             err = 1;
1058             goto fail;
1059         } else if (reply->status_code != RTSP_STATUS_OK ||
1060                    reply->nb_transports != 1) {
1061             err = AVERROR_INVALIDDATA;
1062             goto fail;
1063         }
1064
1065         /* XXX: same protocol for all streams is required */
1066         if (i > 0) {
1067             if (reply->transports[0].lower_transport != rt->lower_transport ||
1068                 reply->transports[0].transport != rt->transport) {
1069                 err = AVERROR_INVALIDDATA;
1070                 goto fail;
1071             }
1072         } else {
1073             rt->lower_transport = reply->transports[0].lower_transport;
1074             rt->transport = reply->transports[0].transport;
1075         }
1076
1077         /* close RTP connection if not choosen */
1078         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1079             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1080             url_close(rtsp_st->rtp_handle);
1081             rtsp_st->rtp_handle = NULL;
1082         }
1083
1084         switch(reply->transports[0].lower_transport) {
1085         case RTSP_LOWER_TRANSPORT_TCP:
1086             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1087             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1088             break;
1089
1090         case RTSP_LOWER_TRANSPORT_UDP:
1091             {
1092                 char url[1024];
1093
1094                 /* XXX: also use address if specified */
1095                 snprintf(url, sizeof(url), "rtp://%s:%d",
1096                          host, reply->transports[0].server_port_min);
1097                 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1098                     rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1099                     err = AVERROR_INVALIDDATA;
1100                     goto fail;
1101                 }
1102             }
1103             break;
1104         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1105             {
1106                 char url[1024];
1107                 struct in_addr in;
1108
1109                 in.s_addr = htonl(reply->transports[0].destination);
1110                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1111                          inet_ntoa(in),
1112                          reply->transports[0].port_min,
1113                          reply->transports[0].ttl);
1114                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1115                     err = AVERROR_INVALIDDATA;
1116                     goto fail;
1117                 }
1118             }
1119             break;
1120         }
1121
1122         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1123             goto fail;
1124     }
1125
1126     if (reply->timeout > 0)
1127         rt->timeout = reply->timeout;
1128
1129     if (rt->server_type == RTSP_SERVER_REAL)
1130         rt->need_subscription = 1;
1131
1132     return 0;
1133
1134 fail:
1135     for (i=0; i<rt->nb_rtsp_streams; i++) {
1136         if (rt->rtsp_streams[i]->rtp_handle) {
1137             url_close(rt->rtsp_streams[i]->rtp_handle);
1138             rt->rtsp_streams[i]->rtp_handle = NULL;
1139         }
1140     }
1141     return err;
1142 }
1143
1144 static int rtsp_read_header(AVFormatContext *s,
1145                             AVFormatParameters *ap)
1146 {
1147     RTSPState *rt = s->priv_data;
1148     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1149     URLContext *rtsp_hd;
1150     int port, ret, err;
1151     RTSPMessageHeader reply1, *reply = &reply1;
1152     unsigned char *content = NULL;
1153     int lower_transport_mask = 0;
1154     char real_challenge[64];
1155
1156     /* extract hostname and port */
1157     url_split(NULL, 0, NULL, 0,
1158               host, sizeof(host), &port, path, sizeof(path), s->filename);
1159     if (port < 0)
1160         port = RTSP_DEFAULT_PORT;
1161
1162     /* search for options */
1163     option_list = strchr(path, '?');
1164     if (option_list) {
1165         /* remove the options from the path */
1166         *option_list++ = 0;
1167         while(option_list) {
1168             /* move the option pointer */
1169             option = option_list;
1170             option_list = strchr(option_list, '&');
1171             if (option_list)
1172                 *(option_list++) = 0;
1173             /* handle the options */
1174             if (strcmp(option, "udp") == 0)
1175                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1176             else if (strcmp(option, "multicast") == 0)
1177                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1178             else if (strcmp(option, "tcp") == 0)
1179                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1180         }
1181     }
1182
1183     if (!lower_transport_mask)
1184         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1185
1186     /* open the tcp connexion */
1187     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1188     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1189         return AVERROR(EIO);
1190     rt->rtsp_hd = rtsp_hd;
1191     rt->seq = 0;
1192
1193     /* request options supported by the server; this also detects server type */
1194     for (rt->server_type = RTSP_SERVER_RTP;;) {
1195         snprintf(cmd, sizeof(cmd),
1196                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1197         if (rt->server_type == RTSP_SERVER_REAL)
1198             av_strlcat(cmd,
1199                        /**
1200                         * The following entries are required for proper
1201                         * streaming from a Realmedia server. They are
1202                         * interdependent in some way although we currently
1203                         * don't quite understand how. Values were copied
1204                         * from mplayer SVN r23589.
1205                         * @param CompanyID is a 16-byte ID in base64
1206                         * @param ClientChallenge is a 16-byte ID in hex
1207                         */
1208                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1209                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1210                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1211                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1212                        sizeof(cmd));
1213         rtsp_send_cmd(s, cmd, reply, NULL);
1214         if (reply->status_code != RTSP_STATUS_OK) {
1215             err = AVERROR_INVALIDDATA;
1216             goto fail;
1217         }
1218
1219         /* detect server type if not standard-compliant RTP */
1220         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1221             rt->server_type = RTSP_SERVER_REAL;
1222             continue;
1223         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1224             rt->server_type = RTSP_SERVER_WMS;
1225         } else if (rt->server_type == RTSP_SERVER_REAL) {
1226             strcpy(real_challenge, reply->real_challenge);
1227         }
1228         break;
1229     }
1230
1231     /* describe the stream */
1232     snprintf(cmd, sizeof(cmd),
1233              "DESCRIBE %s RTSP/1.0\r\n"
1234              "Accept: application/sdp\r\n",
1235              s->filename);
1236     if (rt->server_type == RTSP_SERVER_REAL) {
1237         /**
1238          * The Require: attribute is needed for proper streaming from
1239          * Realmedia servers.
1240          */
1241         av_strlcat(cmd,
1242                    "Require: com.real.retain-entity-for-setup\r\n",
1243                    sizeof(cmd));
1244     }
1245     rtsp_send_cmd(s, cmd, reply, &content);
1246     if (!content) {
1247         err = AVERROR_INVALIDDATA;
1248         goto fail;
1249     }
1250     if (reply->status_code != RTSP_STATUS_OK) {
1251         err = AVERROR_INVALIDDATA;
1252         goto fail;
1253     }
1254
1255     /* now we got the SDP description, we parse it */
1256     ret = sdp_parse(s, (const char *)content);
1257     av_freep(&content);
1258     if (ret < 0) {
1259         err = AVERROR_INVALIDDATA;
1260         goto fail;
1261     }
1262
1263     do {
1264         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1265
1266         err = make_setup_request(s, host, port, lower_transport,
1267                                  rt->server_type == RTSP_SERVER_REAL ?
1268                                      real_challenge : NULL);
1269         if (err < 0)
1270             goto fail;
1271         lower_transport_mask &= ~(1 << lower_transport);
1272         if (lower_transport_mask == 0 && err == 1) {
1273             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1274             goto fail;
1275         }
1276     } while (err);
1277
1278     rt->state = RTSP_STATE_IDLE;
1279     rt->seek_timestamp = 0; /* default is to start stream at position
1280                                zero */
1281     if (ap->initial_pause) {
1282         /* do not start immediately */
1283     } else {
1284         if (rtsp_read_play(s) < 0) {
1285             err = AVERROR_INVALIDDATA;
1286             goto fail;
1287         }
1288     }
1289     return 0;
1290  fail:
1291     rtsp_close_streams(rt);
1292     av_freep(&content);
1293     url_close(rt->rtsp_hd);
1294     return err;
1295 }
1296
1297 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1298                            uint8_t *buf, int buf_size)
1299 {
1300     RTSPState *rt = s->priv_data;
1301     int id, len, i, ret;
1302     RTSPStream *rtsp_st;
1303
1304 #ifdef DEBUG_RTP_TCP
1305     dprintf(s, "tcp_read_packet:\n");
1306 #endif
1307  redo:
1308     for(;;) {
1309         RTSPMessageHeader reply;
1310
1311         ret = rtsp_read_reply(s, &reply, NULL, 1);
1312         if (ret == -1)
1313             return -1;
1314         if (ret == 1) /* received '$' */
1315             break;
1316         /* XXX: parse message */
1317     }
1318     ret = url_read_complete(rt->rtsp_hd, buf, 3);
1319     if (ret != 3)
1320         return -1;
1321     id = buf[0];
1322     len = AV_RB16(buf + 1);
1323 #ifdef DEBUG_RTP_TCP
1324     dprintf(s, "id=%d len=%d\n", id, len);
1325 #endif
1326     if (len > buf_size || len < 12)
1327         goto redo;
1328     /* get the data */
1329     ret = url_read_complete(rt->rtsp_hd, buf, len);
1330     if (ret != len)
1331         return -1;
1332     if (rt->transport == RTSP_TRANSPORT_RDT &&
1333         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1334         return -1;
1335
1336     /* find the matching stream */
1337     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1338         rtsp_st = rt->rtsp_streams[i];
1339         if (id >= rtsp_st->interleaved_min &&
1340             id <= rtsp_st->interleaved_max)
1341             goto found;
1342     }
1343     goto redo;
1344  found:
1345     *prtsp_st = rtsp_st;
1346     return len;
1347 }
1348
1349 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1350                            uint8_t *buf, int buf_size)
1351 {
1352     RTSPState *rt = s->priv_data;
1353     RTSPStream *rtsp_st;
1354     fd_set rfds;
1355     int fd, fd_max, n, i, ret, tcp_fd;
1356     struct timeval tv;
1357
1358     for(;;) {
1359         if (url_interrupt_cb())
1360             return AVERROR(EINTR);
1361         FD_ZERO(&rfds);
1362         if (rt->rtsp_hd) {
1363             tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1364             FD_SET(tcp_fd, &rfds);
1365         } else {
1366             fd_max = 0;
1367             tcp_fd = -1;
1368         }
1369         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1370             rtsp_st = rt->rtsp_streams[i];
1371             if (rtsp_st->rtp_handle) {
1372                 /* currently, we cannot probe RTCP handle because of
1373                  * blocking restrictions */
1374                 fd = url_get_file_handle(rtsp_st->rtp_handle);
1375                 if (fd > fd_max)
1376                     fd_max = fd;
1377                 FD_SET(fd, &rfds);
1378             }
1379         }
1380         tv.tv_sec = 0;
1381         tv.tv_usec = 100 * 1000;
1382         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1383         if (n > 0) {
1384             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1385                 rtsp_st = rt->rtsp_streams[i];
1386                 if (rtsp_st->rtp_handle) {
1387                     fd = url_get_file_handle(rtsp_st->rtp_handle);
1388                     if (FD_ISSET(fd, &rfds)) {
1389                         ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1390                         if (ret > 0) {
1391                             *prtsp_st = rtsp_st;
1392                             return ret;
1393                         }
1394                     }
1395                 }
1396             }
1397             if (FD_ISSET(tcp_fd, &rfds)) {
1398                 RTSPMessageHeader reply;
1399
1400                 rtsp_read_reply(s, &reply, NULL, 0);
1401                 /* XXX: parse message */
1402             }
1403         }
1404     }
1405 }
1406
1407 static int rtsp_read_packet(AVFormatContext *s,
1408                             AVPacket *pkt)
1409 {
1410     RTSPState *rt = s->priv_data;
1411     RTSPStream *rtsp_st;
1412     int ret, len;
1413     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1414     RTSPMessageHeader reply1, *reply = &reply1;
1415     char cmd[1024];
1416
1417     if (rt->server_type == RTSP_SERVER_REAL) {
1418         int i;
1419         enum AVDiscard cache[MAX_STREAMS];
1420
1421         for (i = 0; i < s->nb_streams; i++)
1422             cache[i] = s->streams[i]->discard;
1423
1424         if (!rt->need_subscription) {
1425             if (memcmp (cache, rt->real_setup_cache,
1426                         sizeof(enum AVDiscard) * s->nb_streams)) {
1427                 av_strlcatf(cmd, sizeof(cmd),
1428                             "SET_PARAMETER %s RTSP/1.0\r\n"
1429                             "Unsubscribe: %s\r\n",
1430                             s->filename, rt->last_subscription);
1431                 rtsp_send_cmd(s, cmd, reply, NULL);
1432                 if (reply->status_code != RTSP_STATUS_OK)
1433                     return AVERROR_INVALIDDATA;
1434                 rt->need_subscription = 1;
1435             }
1436         }
1437
1438         if (rt->need_subscription) {
1439             int r, rule_nr, first = 1;
1440
1441             memcpy(rt->real_setup_cache, cache,
1442                    sizeof(enum AVDiscard) * s->nb_streams);
1443             rt->last_subscription[0] = 0;
1444
1445             snprintf(cmd, sizeof(cmd),
1446                      "SET_PARAMETER %s RTSP/1.0\r\n"
1447                      "Subscribe: ",
1448                      s->filename);
1449             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1450                 rule_nr = 0;
1451                 for (r = 0; r < s->nb_streams; r++) {
1452                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1453                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1454                             if (!first)
1455                                 av_strlcat(rt->last_subscription, ",",
1456                                            sizeof(rt->last_subscription));
1457                             ff_rdt_subscribe_rule(
1458                                 rt->last_subscription,
1459                                 sizeof(rt->last_subscription), i, rule_nr);
1460                             first = 0;
1461                         }
1462                         rule_nr++;
1463                     }
1464                 }
1465             }
1466             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1467             rtsp_send_cmd(s, cmd, reply, NULL);
1468             if (reply->status_code != RTSP_STATUS_OK)
1469                 return AVERROR_INVALIDDATA;
1470             rt->need_subscription = 0;
1471
1472             if (rt->state == RTSP_STATE_PLAYING)
1473                 rtsp_read_play (s);
1474         }
1475     }
1476
1477     /* get next frames from the same RTP packet */
1478     if (rt->cur_transport_priv) {
1479         if (rt->transport == RTSP_TRANSPORT_RDT)
1480             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1481         else
1482             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1483         if (ret == 0) {
1484             rt->cur_transport_priv = NULL;
1485             return 0;
1486         } else if (ret == 1) {
1487             return 0;
1488         } else {
1489             rt->cur_transport_priv = NULL;
1490         }
1491     }
1492
1493     /* read next RTP packet */
1494  redo:
1495     switch(rt->lower_transport) {
1496     default:
1497     case RTSP_LOWER_TRANSPORT_TCP:
1498         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1499         break;
1500     case RTSP_LOWER_TRANSPORT_UDP:
1501     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1502         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1503         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1504             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1505         break;
1506     }
1507     if (len < 0)
1508         return len;
1509     if (rt->transport == RTSP_TRANSPORT_RDT)
1510         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1511     else
1512         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1513     if (ret < 0)
1514         goto redo;
1515     if (ret == 1) {
1516         /* more packets may follow, so we save the RTP context */
1517         rt->cur_transport_priv = rtsp_st->transport_priv;
1518     }
1519
1520     /* send dummy request to keep TCP connection alive */
1521     if ((rt->server_type == RTSP_SERVER_WMS ||
1522          rt->server_type == RTSP_SERVER_REAL) &&
1523         (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1524         if (rt->server_type == RTSP_SERVER_WMS) {
1525             snprintf(cmd, sizeof(cmd) - 1,
1526                      "GET_PARAMETER %s RTSP/1.0\r\n",
1527                      s->filename);
1528             rtsp_send_cmd_async(s, cmd, reply, NULL);
1529         } else {
1530             rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n",
1531                                 reply, NULL);
1532         }
1533     }
1534
1535     return 0;
1536 }
1537
1538 static int rtsp_read_play(AVFormatContext *s)
1539 {
1540     RTSPState *rt = s->priv_data;
1541     RTSPMessageHeader reply1, *reply = &reply1;
1542     char cmd[1024];
1543
1544     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1545
1546     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1547         if (rt->state == RTSP_STATE_PAUSED) {
1548             snprintf(cmd, sizeof(cmd),
1549                      "PLAY %s RTSP/1.0\r\n",
1550                      s->filename);
1551         } else {
1552             snprintf(cmd, sizeof(cmd),
1553                      "PLAY %s RTSP/1.0\r\n"
1554                      "Range: npt=%0.3f-\r\n",
1555                      s->filename,
1556                      (double)rt->seek_timestamp / AV_TIME_BASE);
1557         }
1558         rtsp_send_cmd(s, cmd, reply, NULL);
1559         if (reply->status_code != RTSP_STATUS_OK) {
1560             return -1;
1561         }
1562     }
1563     rt->state = RTSP_STATE_PLAYING;
1564     return 0;
1565 }
1566
1567 /* pause the stream */
1568 static int rtsp_read_pause(AVFormatContext *s)
1569 {
1570     RTSPState *rt = s->priv_data;
1571     RTSPMessageHeader reply1, *reply = &reply1;
1572     char cmd[1024];
1573
1574     rt = s->priv_data;
1575
1576     if (rt->state != RTSP_STATE_PLAYING)
1577         return 0;
1578     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1579         snprintf(cmd, sizeof(cmd),
1580                  "PAUSE %s RTSP/1.0\r\n",
1581                  s->filename);
1582         rtsp_send_cmd(s, cmd, reply, NULL);
1583         if (reply->status_code != RTSP_STATUS_OK) {
1584             return -1;
1585         }
1586     }
1587     rt->state = RTSP_STATE_PAUSED;
1588     return 0;
1589 }
1590
1591 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1592                           int64_t timestamp, int flags)
1593 {
1594     RTSPState *rt = s->priv_data;
1595
1596     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1597     switch(rt->state) {
1598     default:
1599     case RTSP_STATE_IDLE:
1600         break;
1601     case RTSP_STATE_PLAYING:
1602         if (rtsp_read_pause(s) != 0)
1603             return -1;
1604         rt->state = RTSP_STATE_SEEKING;
1605         if (rtsp_read_play(s) != 0)
1606             return -1;
1607         break;
1608     case RTSP_STATE_PAUSED:
1609         rt->state = RTSP_STATE_IDLE;
1610         break;
1611     }
1612     return 0;
1613 }
1614
1615 static int rtsp_read_close(AVFormatContext *s)
1616 {
1617     RTSPState *rt = s->priv_data;
1618     RTSPMessageHeader reply1, *reply = &reply1;
1619     char cmd[1024];
1620
1621 #if 0
1622     /* NOTE: it is valid to flush the buffer here */
1623     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1624         url_fclose(&rt->rtsp_gb);
1625     }
1626 #endif
1627     snprintf(cmd, sizeof(cmd),
1628              "TEARDOWN %s RTSP/1.0\r\n",
1629              s->filename);
1630     rtsp_send_cmd(s, cmd, reply, NULL);
1631
1632     rtsp_close_streams(rt);
1633     url_close(rt->rtsp_hd);
1634     return 0;
1635 }
1636
1637 #if CONFIG_RTSP_DEMUXER
1638 AVInputFormat rtsp_demuxer = {
1639     "rtsp",
1640     NULL_IF_CONFIG_SMALL("RTSP input format"),
1641     sizeof(RTSPState),
1642     rtsp_probe,
1643     rtsp_read_header,
1644     rtsp_read_packet,
1645     rtsp_read_close,
1646     rtsp_read_seek,
1647     .flags = AVFMT_NOFILE,
1648     .read_play = rtsp_read_play,
1649     .read_pause = rtsp_read_pause,
1650 };
1651 #endif
1652
1653 static int sdp_probe(AVProbeData *p1)
1654 {
1655     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1656
1657     /* we look for a line beginning "c=IN IP4" */
1658     while (p < p_end && *p != '\0') {
1659         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1660             return AVPROBE_SCORE_MAX / 2;
1661
1662         while(p < p_end - 1 && *p != '\n') p++;
1663         if (++p >= p_end)
1664             break;
1665         if (*p == '\r')
1666             p++;
1667     }
1668     return 0;
1669 }
1670
1671 #define SDP_MAX_SIZE 8192
1672
1673 static int sdp_read_header(AVFormatContext *s,
1674                            AVFormatParameters *ap)
1675 {
1676     RTSPState *rt = s->priv_data;
1677     RTSPStream *rtsp_st;
1678     int size, i, err;
1679     char *content;
1680     char url[1024];
1681
1682     /* read the whole sdp file */
1683     /* XXX: better loading */
1684     content = av_malloc(SDP_MAX_SIZE);
1685     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1686     if (size <= 0) {
1687         av_free(content);
1688         return AVERROR_INVALIDDATA;
1689     }
1690     content[size] ='\0';
1691
1692     sdp_parse(s, content);
1693     av_free(content);
1694
1695     /* open each RTP stream */
1696     for(i=0;i<rt->nb_rtsp_streams;i++) {
1697         rtsp_st = rt->rtsp_streams[i];
1698
1699         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1700                  inet_ntoa(rtsp_st->sdp_ip),
1701                  rtsp_st->sdp_port,
1702                  rtsp_st->sdp_port,
1703                  rtsp_st->sdp_ttl);
1704         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1705             err = AVERROR_INVALIDDATA;
1706             goto fail;
1707         }
1708         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1709             goto fail;
1710     }
1711     return 0;
1712  fail:
1713     rtsp_close_streams(rt);
1714     return err;
1715 }
1716
1717 static int sdp_read_packet(AVFormatContext *s,
1718                             AVPacket *pkt)
1719 {
1720     return rtsp_read_packet(s, pkt);
1721 }
1722
1723 static int sdp_read_close(AVFormatContext *s)
1724 {
1725     RTSPState *rt = s->priv_data;
1726     rtsp_close_streams(rt);
1727     return 0;
1728 }
1729
1730 #if CONFIG_SDP_DEMUXER
1731 AVInputFormat sdp_demuxer = {
1732     "sdp",
1733     NULL_IF_CONFIG_SMALL("SDP"),
1734     sizeof(RTSPState),
1735     sdp_probe,
1736     sdp_read_header,
1737     sdp_read_packet,
1738     sdp_read_close,
1739 };
1740 #endif
1741
1742 #if CONFIG_REDIR_DEMUXER
1743 /* dummy redirector format (used directly in av_open_input_file now) */
1744 static int redir_probe(AVProbeData *pd)
1745 {
1746     const char *p;
1747     p = pd->buf;
1748     skip_spaces(&p);
1749     if (av_strstart(p, "http://", NULL) ||
1750         av_strstart(p, "rtsp://", NULL))
1751         return AVPROBE_SCORE_MAX;
1752     return 0;
1753 }
1754
1755 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1756 {
1757     char buf[4096], *q;
1758     int c;
1759     AVFormatContext *ic = NULL;
1760     ByteIOContext *f = s->pb;
1761
1762     /* parse each URL and try to open it */
1763     c = url_fgetc(f);
1764     while (c != URL_EOF) {
1765         /* skip spaces */
1766         for(;;) {
1767             if (!redir_isspace(c))
1768                 break;
1769             c = url_fgetc(f);
1770         }
1771         if (c == URL_EOF)
1772             break;
1773         /* record url */
1774         q = buf;
1775         for(;;) {
1776             if (c == URL_EOF || redir_isspace(c))
1777                 break;
1778             if ((q - buf) < sizeof(buf) - 1)
1779                 *q++ = c;
1780             c = url_fgetc(f);
1781         }
1782         *q = '\0';
1783         //printf("URL='%s'\n", buf);
1784         /* try to open the media file */
1785         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1786             break;
1787     }
1788     if (!ic)
1789         return AVERROR(EIO);
1790
1791     *s = *ic;
1792     url_fclose(f);
1793
1794     return 0;
1795 }
1796
1797 AVInputFormat redir_demuxer = {
1798     "redir",
1799     NULL_IF_CONFIG_SMALL("Redirector format"),
1800     0,
1801     redir_probe,
1802     redir_read_header,
1803     NULL,
1804     NULL,
1805 };
1806 #endif