libavformat/rtsp.c

   1 /*
   2  * RTSP/SDP client
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /* needed by inet_aton() */
  23 #define _SVID_SOURCE
  24
  25 #include "libavutil/avstring.h"
  26 #include "libavutil/intreadwrite.h"
  27 #include "avformat.h"
  28
  29 #include <sys/time.h>
  30 #if HAVE_SYS_SELECT_H
  31 #include <sys/select.h>
  32 #endif
  33 #include <strings.h>
  34 #include "network.h"
  35 #include "rtsp.h"
  36
  37 #include "rtpdec.h"
  38 #include "rdt.h"
  39 #include "rtp_asf.h"
  40
  41 //#define DEBUG
  42 //#define DEBUG_RTP_TCP
  43
  44 static int rtsp_read_play(AVFormatContext *s);
  45
  46 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  47 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
  48 #endif
  49
  50 static int rtsp_probe(AVProbeData *p)
  51 {
  52     if (av_strstart(p->filename, "rtsp:", NULL))
  53         return AVPROBE_SCORE_MAX;
  54     return 0;
  55 }
  56
  57 #define SPACE_CHARS " \t\r\n"
  58 #define redir_isspace(c) strchr(SPACE_CHARS, c)
  59 static void skip_spaces(const char **pp)
  60 {
  61     const char *p;
  62     p = *pp;
  63     while (redir_isspace(*p))
  64         p++;
  65     *pp = p;
  66 }
  67
  68 static void get_word_until_chars(char *buf, int buf_size,
  69                                  const char *sep, const char **pp)
  70 {
  71     const char *p;
  72     char *q;
  73
  74     p = *pp;
  75     skip_spaces(&p);
  76     q = buf;
  77     while (!strchr(sep, *p) && *p != '\0') {
  78         if ((q - buf) < buf_size - 1)
  79             *q++ = *p;
  80         p++;
  81     }
  82     if (buf_size > 0)
  83         *q = '\0';
  84     *pp = p;
  85 }
  86
  87 static void get_word_sep(char *buf, int buf_size, const char *sep,
  88                          const char **pp)
  89 {
  90     if (**pp == '/') (*pp)++;
  91     get_word_until_chars(buf, buf_size, sep, pp);
  92 }
  93
  94 static void get_word(char *buf, int buf_size, const char **pp)
  95 {
  96     get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
  97 }
  98
  99 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 100    params>] */
 101 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 102 {
 103     char buf[256];
 104     int i;
 105     AVCodec *c;
 106     const char *c_name;
 107
 108     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 109        see if we can handle this kind of payload */
 110     get_word_sep(buf, sizeof(buf), "/", &p);
 111     if (payload_type >= RTP_PT_PRIVATE) {
 112         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 113         while(handler) {
 114             if (!strcasecmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 115                 codec->codec_id = handler->codec_id;
 116                 rtsp_st->dynamic_handler= handler;
 117                 if(handler->open) {
 118                     rtsp_st->dynamic_protocol_context= handler->open();
 119                 }
 120                 break;
 121             }
 122             handler= handler->next;
 123         }
 124     } else {
 125         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 126         /* search into AVRtpPayloadTypes[] */
 127         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 128     }
 129
 130     c = avcodec_find_decoder(codec->codec_id);
 131     if (c && c->name)
 132         c_name = c->name;
 133     else
 134         c_name = (char *)NULL;
 135
 136     if (c_name) {
 137         get_word_sep(buf, sizeof(buf), "/", &p);
 138         i = atoi(buf);
 139         switch (codec->codec_type) {
 140             case CODEC_TYPE_AUDIO:
 141                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 142                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 143                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 144                 if (i > 0) {
 145                     codec->sample_rate = i;
 146                     get_word_sep(buf, sizeof(buf), "/", &p);
 147                     i = atoi(buf);
 148                     if (i > 0)
 149                         codec->channels = i;
 150                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 151                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 152                 }
 153                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 154                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 155                 break;
 156             case CODEC_TYPE_VIDEO:
 157                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 158                 break;
 159             default:
 160                 break;
 161         }
 162         return 0;
 163     }
 164
 165     return -1;
 166 }
 167
 168 /* return the length and optionnaly the data */
 169 static int hex_to_data(uint8_t *data, const char *p)
 170 {
 171     int c, len, v;
 172
 173     len = 0;
 174     v = 1;
 175     for(;;) {
 176         skip_spaces(&p);
 177         if (*p == '\0')
 178             break;
 179         c = toupper((unsigned char)*p++);
 180         if (c >= '0' && c <= '9')
 181             c = c - '0';
 182         else if (c >= 'A' && c <= 'F')
 183             c = c - 'A' + 10;
 184         else
 185             break;
 186         v = (v << 4) | c;
 187         if (v & 0x100) {
 188             if (data)
 189                 data[len] = v;
 190             len++;
 191             v = 1;
 192         }
 193     }
 194     return len;
 195 }
 196
 197 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 198 {
 199     switch (codec->codec_id) {
 200         case CODEC_ID_MPEG4:
 201         case CODEC_ID_AAC:
 202             if (!strcmp(attr, "config")) {
 203                 /* decode the hexa encoded parameter */
 204                 int len = hex_to_data(NULL, value);
 205                 if (codec->extradata)
 206                     av_free(codec->extradata);
 207                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 208                 if (!codec->extradata)
 209                     return;
 210                 codec->extradata_size = len;
 211                 hex_to_data(codec->extradata, value);
 212             }
 213             break;
 214         default:
 215             break;
 216     }
 217     return;
 218 }
 219
 220 typedef struct {
 221     const char *str;
 222     uint16_t type;
 223     uint32_t offset;
 224 } AttrNameMap;
 225
 226 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 227 #define ATTR_NAME_TYPE_INT 0
 228 #define ATTR_NAME_TYPE_STR 1
 229 static const AttrNameMap attr_names[]=
 230 {
 231     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, sizelength)},
 232     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexlength)},
 233     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, indexdeltalength)},
 234     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, profile_level_id)},
 235     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(RTPPayloadData, streamtype)},
 236     {"mode",             ATTR_NAME_TYPE_STR, offsetof(RTPPayloadData, mode)},
 237     {NULL, -1, -1},
 238 };
 239
 240 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 241 * because it is used in rtp_h264.c, which is forthcoming.
 242 */
 243 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 244 {
 245     skip_spaces(p);
 246     if(**p) {
 247         get_word_sep(attr, attr_size, "=", p);
 248         if (**p == '=')
 249             (*p)++;
 250         get_word_sep(value, value_size, ";", p);
 251         if (**p == ';')
 252             (*p)++;
 253         return 1;
 254     }
 255     return 0;
 256 }
 257
 258 /* parse a SDP line and save stream attributes */
 259 static void sdp_parse_fmtp(AVStream *st, const char *p)
 260 {
 261     char attr[256];
 262     char value[4096];
 263     int i;
 264
 265     RTSPStream *rtsp_st = st->priv_data;
 266     AVCodecContext *codec = st->codec;
 267     RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
 268
 269     /* loop on each attribute */
 270     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 271     {
 272         /* grab the codec extra_data from the config parameter of the fmtp line */
 273         sdp_parse_fmtp_config(codec, attr, value);
 274         /* Looking for a known attribute */
 275         for (i = 0; attr_names[i].str; ++i) {
 276             if (!strcasecmp(attr, attr_names[i].str)) {
 277                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 278                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 279                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 280                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 281             }
 282         }
 283     }
 284 }
 285
 286 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 287  *  and end time.
 288  *  Used for seeking in the rtp stream.
 289  */
 290 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 291 {
 292     char buf[256];
 293
 294     skip_spaces(&p);
 295     if (!av_stristart(p, "npt=", &p))
 296         return;
 297
 298     *start = AV_NOPTS_VALUE;
 299     *end = AV_NOPTS_VALUE;
 300
 301     get_word_sep(buf, sizeof(buf), "-", &p);
 302     *start = parse_date(buf, 1);
 303     if (*p == '-') {
 304         p++;
 305         get_word_sep(buf, sizeof(buf), "-", &p);
 306         *end = parse_date(buf, 1);
 307     }
 308 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 309 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 310 }
 311
 312 typedef struct SDPParseState {
 313     /* SDP only */
 314     struct in_addr default_ip;
 315     int default_ttl;
 316     int skip_media; ///< set if an unknown m= line occurs
 317 } SDPParseState;
 318
 319 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 320                            int letter, const char *buf)
 321 {
 322     RTSPState *rt = s->priv_data;
 323     char buf1[64], st_type[64];
 324     const char *p;
 325     enum CodecType codec_type;
 326     int payload_type, i;
 327     AVStream *st;
 328     RTSPStream *rtsp_st;
 329     struct in_addr sdp_ip;
 330     int ttl;
 331
 332 #ifdef DEBUG
 333     printf("sdp: %c='%s'\n", letter, buf);
 334 #endif
 335
 336     p = buf;
 337     if (s1->skip_media && letter != 'm')
 338         return;
 339     switch(letter) {
 340     case 'c':
 341         get_word(buf1, sizeof(buf1), &p);
 342         if (strcmp(buf1, "IN") != 0)
 343             return;
 344         get_word(buf1, sizeof(buf1), &p);
 345         if (strcmp(buf1, "IP4") != 0)
 346             return;
 347         get_word_sep(buf1, sizeof(buf1), "/", &p);
 348         if (inet_aton(buf1, &sdp_ip) == 0)
 349             return;
 350         ttl = 16;
 351         if (*p == '/') {
 352             p++;
 353             get_word_sep(buf1, sizeof(buf1), "/", &p);
 354             ttl = atoi(buf1);
 355         }
 356         if (s->nb_streams == 0) {
 357             s1->default_ip = sdp_ip;
 358             s1->default_ttl = ttl;
 359         } else {
 360             st = s->streams[s->nb_streams - 1];
 361             rtsp_st = st->priv_data;
 362             rtsp_st->sdp_ip = sdp_ip;
 363             rtsp_st->sdp_ttl = ttl;
 364         }
 365         break;
 366     case 's':
 367         av_metadata_set(&s->metadata, "title", p);
 368         break;
 369     case 'i':
 370         if (s->nb_streams == 0) {
 371             av_metadata_set(&s->metadata, "comment", p);
 372             break;
 373         }
 374         break;
 375     case 'm':
 376         /* new stream */
 377         s1->skip_media = 0;
 378         get_word(st_type, sizeof(st_type), &p);
 379         if (!strcmp(st_type, "audio")) {
 380             codec_type = CODEC_TYPE_AUDIO;
 381         } else if (!strcmp(st_type, "video")) {
 382             codec_type = CODEC_TYPE_VIDEO;
 383         } else if (!strcmp(st_type, "application")) {
 384             codec_type = CODEC_TYPE_DATA;
 385         } else {
 386             s1->skip_media = 1;
 387             return;
 388         }
 389         rtsp_st = av_mallocz(sizeof(RTSPStream));
 390         if (!rtsp_st)
 391             return;
 392         rtsp_st->stream_index = -1;
 393         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 394
 395         rtsp_st->sdp_ip = s1->default_ip;
 396         rtsp_st->sdp_ttl = s1->default_ttl;
 397
 398         get_word(buf1, sizeof(buf1), &p); /* port */
 399         rtsp_st->sdp_port = atoi(buf1);
 400
 401         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 402
 403         /* XXX: handle list of formats */
 404         get_word(buf1, sizeof(buf1), &p); /* format list */
 405         rtsp_st->sdp_payload_type = atoi(buf1);
 406
 407         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 408             /* no corresponding stream */
 409         } else {
 410             st = av_new_stream(s, 0);
 411             if (!st)
 412                 return;
 413             st->priv_data = rtsp_st;
 414             rtsp_st->stream_index = st->index;
 415             st->codec->codec_type = codec_type;
 416             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 417                 /* if standard payload type, we can find the codec right now */
 418                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 419             }
 420         }
 421         /* put a default control url */
 422         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 423         break;
 424     case 'a':
 425         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 426             char proto[32];
 427             /* get the control url */
 428             st = s->streams[s->nb_streams - 1];
 429             rtsp_st = st->priv_data;
 430
 431             /* XXX: may need to add full url resolution */
 432             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 433             if (proto[0] == '\0') {
 434                 /* relative control URL */
 435                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 436                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 437             } else {
 438                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 439             }
 440         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 441             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 442             get_word(buf1, sizeof(buf1), &p);
 443             payload_type = atoi(buf1);
 444             st = s->streams[s->nb_streams - 1];
 445             rtsp_st = st->priv_data;
 446             sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 447         } else if (av_strstart(p, "fmtp:", &p)) {
 448             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 449             get_word(buf1, sizeof(buf1), &p);
 450             payload_type = atoi(buf1);
 451             for(i = 0; i < s->nb_streams;i++) {
 452                 st = s->streams[i];
 453                 rtsp_st = st->priv_data;
 454                 if (rtsp_st->sdp_payload_type == payload_type) {
 455                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 456                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
 457                             sdp_parse_fmtp(st, p);
 458                         }
 459                     } else {
 460                         sdp_parse_fmtp(st, p);
 461                     }
 462                 }
 463             }
 464         } else if(av_strstart(p, "framesize:", &p)) {
 465             // let dynamic protocol handlers have a stab at the line.
 466             get_word(buf1, sizeof(buf1), &p);
 467             payload_type = atoi(buf1);
 468             for(i = 0; i < s->nb_streams;i++) {
 469                 st = s->streams[i];
 470                 rtsp_st = st->priv_data;
 471                 if (rtsp_st->sdp_payload_type == payload_type) {
 472                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 473                         rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
 474                     }
 475                 }
 476             }
 477         } else if(av_strstart(p, "range:", &p)) {
 478             int64_t start, end;
 479
 480             // this is so that seeking on a streamed file can work.
 481             rtsp_parse_range_npt(p, &start, &end);
 482             s->start_time= start;
 483             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 484         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 485             if (atoi(p) == 1)
 486                 rt->transport = RTSP_TRANSPORT_RDT;
 487         } else {
 488             if (rt->server_type == RTSP_SERVER_WMS)
 489                 ff_wms_parse_sdp_a_line(s, p);
 490             if (s->nb_streams > 0) {
 491                 if (rt->server_type == RTSP_SERVER_REAL)
 492                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 493
 494                 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 495                 if (rtsp_st->dynamic_handler &&
 496                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 497                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
 498                         rtsp_st->dynamic_protocol_context, buf);
 499             }
 500         }
 501         break;
 502     }
 503 }
 504
 505 static int sdp_parse(AVFormatContext *s, const char *content)
 506 {
 507     const char *p;
 508     int letter;
 509     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 510      * contain long SDP lines containing complete ASF Headers (several
 511      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 512      * "rulebooks" describing their properties. Therefore, the SDP line
 513      * buffer is large. */
 514     char buf[8192], *q;
 515     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 516
 517     memset(s1, 0, sizeof(SDPParseState));
 518     p = content;
 519     for(;;) {
 520         skip_spaces(&p);
 521         letter = *p;
 522         if (letter == '\0')
 523             break;
 524         p++;
 525         if (*p != '=')
 526             goto next_line;
 527         p++;
 528         /* get the content */
 529         q = buf;
 530         while (*p != '\n' && *p != '\r' && *p != '\0') {
 531             if ((q - buf) < sizeof(buf) - 1)
 532                 *q++ = *p;
 533             p++;
 534         }
 535         *q = '\0';
 536         sdp_parse_line(s, s1, letter, buf);
 537     next_line:
 538         while (*p != '\n' && *p != '\0')
 539             p++;
 540         if (*p == '\n')
 541             p++;
 542     }
 543     return 0;
 544 }
 545
 546 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 547 {
 548     const char *p;
 549     int v;
 550
 551     p = *pp;
 552     skip_spaces(&p);
 553     v = strtol(p, (char **)&p, 10);
 554     if (*p == '-') {
 555         p++;
 556         *min_ptr = v;
 557         v = strtol(p, (char **)&p, 10);
 558         *max_ptr = v;
 559     } else {
 560         *min_ptr = v;
 561         *max_ptr = v;
 562     }
 563     *pp = p;
 564 }
 565
 566 /* XXX: only one transport specification is parsed */
 567 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
 568 {
 569     char transport_protocol[16];
 570     char profile[16];
 571     char lower_transport[16];
 572     char parameter[16];
 573     RTSPTransportField *th;
 574     char buf[256];
 575
 576     reply->nb_transports = 0;
 577
 578     for(;;) {
 579         skip_spaces(&p);
 580         if (*p == '\0')
 581             break;
 582
 583         th = &reply->transports[reply->nb_transports];
 584
 585         get_word_sep(transport_protocol, sizeof(transport_protocol),
 586                      "/", &p);
 587         if (!strcasecmp (transport_protocol, "rtp")) {
 588             get_word_sep(profile, sizeof(profile), "/;,", &p);
 589             lower_transport[0] = '\0';
 590             /* rtp/avp/<protocol> */
 591             if (*p == '/') {
 592                 get_word_sep(lower_transport, sizeof(lower_transport),
 593                              ";,", &p);
 594             }
 595             th->transport = RTSP_TRANSPORT_RTP;
 596         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 597                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 598             /* x-pn-tng/<protocol> */
 599             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 600             profile[0] = '\0';
 601             th->transport = RTSP_TRANSPORT_RDT;
 602         }
 603         if (!strcasecmp(lower_transport, "TCP"))
 604             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 605         else
 606             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 607
 608         if (*p == ';')
 609             p++;
 610         /* get each parameter */
 611         while (*p != '\0' && *p != ',') {
 612             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 613             if (!strcmp(parameter, "port")) {
 614                 if (*p == '=') {
 615                     p++;
 616                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 617                 }
 618             } else if (!strcmp(parameter, "client_port")) {
 619                 if (*p == '=') {
 620                     p++;
 621                     rtsp_parse_range(&th->client_port_min,
 622                                      &th->client_port_max, &p);
 623                 }
 624             } else if (!strcmp(parameter, "server_port")) {
 625                 if (*p == '=') {
 626                     p++;
 627                     rtsp_parse_range(&th->server_port_min,
 628                                      &th->server_port_max, &p);
 629                 }
 630             } else if (!strcmp(parameter, "interleaved")) {
 631                 if (*p == '=') {
 632                     p++;
 633                     rtsp_parse_range(&th->interleaved_min,
 634                                      &th->interleaved_max, &p);
 635                 }
 636             } else if (!strcmp(parameter, "multicast")) {
 637                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 638                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 639             } else if (!strcmp(parameter, "ttl")) {
 640                 if (*p == '=') {
 641                     p++;
 642                     th->ttl = strtol(p, (char **)&p, 10);
 643                 }
 644             } else if (!strcmp(parameter, "destination")) {
 645                 struct in_addr ipaddr;
 646
 647                 if (*p == '=') {
 648                     p++;
 649                     get_word_sep(buf, sizeof(buf), ";,", &p);
 650                     if (inet_aton(buf, &ipaddr))
 651                         th->destination = ntohl(ipaddr.s_addr);
 652                 }
 653             }
 654             while (*p != ';' && *p != '\0' && *p != ',')
 655                 p++;
 656             if (*p == ';')
 657                 p++;
 658         }
 659         if (*p == ',')
 660             p++;
 661
 662         reply->nb_transports++;
 663     }
 664 }
 665
 666 void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
 667 {
 668     const char *p;
 669
 670     /* NOTE: we do case independent match for broken servers */
 671     p = buf;
 672     if (av_stristart(p, "Session:", &p)) {
 673         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 674     } else if (av_stristart(p, "Content-Length:", &p)) {
 675         reply->content_length = strtol(p, NULL, 10);
 676     } else if (av_stristart(p, "Transport:", &p)) {
 677         rtsp_parse_transport(reply, p);
 678     } else if (av_stristart(p, "CSeq:", &p)) {
 679         reply->seq = strtol(p, NULL, 10);
 680     } else if (av_stristart(p, "Range:", &p)) {
 681         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 682     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 683         skip_spaces(&p);
 684         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 685     } else if (av_stristart(p, "Server:", &p)) {
 686         skip_spaces(&p);
 687         av_strlcpy(reply->server, p, sizeof(reply->server));
 688     }
 689 }
 690
 691 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 692 {
 693     int ret, len;
 694
 695     len = 0;
 696     while (len < size) {
 697         ret = url_read(h, buf+len, size-len);
 698         if (ret < 1)
 699             return ret;
 700         len += ret;
 701     }
 702     return len;
 703 }
 704
 705 /* skip a RTP/TCP interleaved packet */
 706 static void rtsp_skip_packet(AVFormatContext *s)
 707 {
 708     RTSPState *rt = s->priv_data;
 709     int ret, len, len1;
 710     uint8_t buf[1024];
 711
 712     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 713     if (ret != 3)
 714         return;
 715     len = AV_RB16(buf + 1);
 716 #ifdef DEBUG
 717     printf("skipping RTP packet len=%d\n", len);
 718 #endif
 719     /* skip payload */
 720     while (len > 0) {
 721         len1 = len;
 722         if (len1 > sizeof(buf))
 723             len1 = sizeof(buf);
 724         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 725         if (ret != len1)
 726             return;
 727         len -= len1;
 728     }
 729 }
 730
 731 /**
 732  * Read a RTSP message from the server, or prepare to read data
 733  * packets if we're reading data interleaved over the TCP/RTSP
 734  * connection as well.
 735  *
 736  * @param s RTSP demuxer context
 737  * @param reply pointer where the RTSP message header will be stored
 738  * @param content_ptr pointer where the RTSP message body, if any, will
 739  *                    be stored (length is in \p reply)
 740  * @param return_on_interleaved_data whether the function may return if we
 741  *                   encounter a data marker ('$'), which precedes data
 742  *                   packets over interleaved TCP/RTSP connections. If this
 743  *                   is set, this function will return 1 after encountering
 744  *                   a '$'. If it is not set, the function will skip any
 745  *                   data packets (if they are encountered), until a reply
 746  *                   has been fully parsed. If no more data is available
 747  *                   without parsing a reply, it will return an error.
 748  *
 749  * @returns 1 if a data packets is ready to be received, -1 on error,
 750  *          and 0 on success.
 751  */
 752 static int
 753 rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
 754                  unsigned char **content_ptr, int return_on_interleaved_data)
 755 {
 756     RTSPState *rt = s->priv_data;
 757     char buf[4096], buf1[1024], *q;
 758     unsigned char ch;
 759     const char *p;
 760     int ret, content_length, line_count = 0;
 761     unsigned char *content = NULL;
 762
 763     memset(reply, 0, sizeof(*reply));
 764
 765     /* parse reply (XXX: use buffers) */
 766     rt->last_reply[0] = '\0';
 767     for(;;) {
 768         q = buf;
 769         for(;;) {
 770             ret = url_readbuf(rt->rtsp_hd, &ch, 1);
 771 #ifdef DEBUG_RTP_TCP
 772             printf("ret=%d c=%02x [%c]\n", ret, ch, ch);
 773 #endif
 774             if (ret != 1)
 775                 return -1;
 776             if (ch == '\n')
 777                 break;
 778             if (ch == '$') {
 779                 /* XXX: only parse it if first char on line ? */
 780                 if (return_on_interleaved_data) {
 781                     return 1;
 782                 } else
 783                 rtsp_skip_packet(s);
 784             } else if (ch != '\r') {
 785                 if ((q - buf) < sizeof(buf) - 1)
 786                     *q++ = ch;
 787             }
 788         }
 789         *q = '\0';
 790 #ifdef DEBUG
 791         printf("line='%s'\n", buf);
 792 #endif
 793         /* test if last line */
 794         if (buf[0] == '\0')
 795             break;
 796         p = buf;
 797         if (line_count == 0) {
 798             /* get reply code */
 799             get_word(buf1, sizeof(buf1), &p);
 800             get_word(buf1, sizeof(buf1), &p);
 801             reply->status_code = atoi(buf1);
 802         } else {
 803             rtsp_parse_line(reply, p);
 804             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 805             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 806         }
 807         line_count++;
 808     }
 809
 810     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 811         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 812
 813     content_length = reply->content_length;
 814     if (content_length > 0) {
 815         /* leave some room for a trailing '\0' (useful for simple parsing) */
 816         content = av_malloc(content_length + 1);
 817         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 818         content[content_length] = '\0';
 819     }
 820     if (content_ptr)
 821         *content_ptr = content;
 822     else
 823         av_free(content);
 824
 825     return 0;
 826 }
 827
 828 static void rtsp_send_cmd(AVFormatContext *s,
 829                           const char *cmd, RTSPMessageHeader *reply,
 830                           unsigned char **content_ptr)
 831 {
 832     RTSPState *rt = s->priv_data;
 833     char buf[4096], buf1[1024];
 834
 835     rt->seq++;
 836     av_strlcpy(buf, cmd, sizeof(buf));
 837     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 838     av_strlcat(buf, buf1, sizeof(buf));
 839     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 840         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 841         av_strlcat(buf, buf1, sizeof(buf));
 842     }
 843     av_strlcat(buf, "\r\n", sizeof(buf));
 844 #ifdef DEBUG
 845     printf("Sending:\n%s--\n", buf);
 846 #endif
 847     url_write(rt->rtsp_hd, buf, strlen(buf));
 848
 849     rtsp_read_reply(s, reply, content_ptr, 0);
 850 }
 851
 852
 853 /* close and free RTSP streams */
 854 static void rtsp_close_streams(RTSPState *rt)
 855 {
 856     int i;
 857     RTSPStream *rtsp_st;
 858
 859     for(i=0;i<rt->nb_rtsp_streams;i++) {
 860         rtsp_st = rt->rtsp_streams[i];
 861         if (rtsp_st) {
 862             if (rtsp_st->transport_priv) {
 863                 if (rt->transport == RTSP_TRANSPORT_RDT)
 864                     ff_rdt_parse_close(rtsp_st->transport_priv);
 865                 else
 866                     rtp_parse_close(rtsp_st->transport_priv);
 867             }
 868             if (rtsp_st->rtp_handle)
 869                 url_close(rtsp_st->rtp_handle);
 870             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 871                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 872         }
 873     }
 874     av_free(rt->rtsp_streams);
 875     if (rt->asf_ctx) {
 876         av_close_input_stream (rt->asf_ctx);
 877         rt->asf_ctx = NULL;
 878     }
 879 }
 880
 881 static int
 882 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 883 {
 884     RTSPState *rt = s->priv_data;
 885     AVStream *st = NULL;
 886
 887     /* open the RTP context */
 888     if (rtsp_st->stream_index >= 0)
 889         st = s->streams[rtsp_st->stream_index];
 890     if (!st)
 891         s->ctx_flags |= AVFMTCTX_NOHEADER;
 892
 893     if (rt->transport == RTSP_TRANSPORT_RDT)
 894         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 895                                             rtsp_st->dynamic_protocol_context,
 896                                             rtsp_st->dynamic_handler);
 897     else
 898         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 899                                          rtsp_st->sdp_payload_type,
 900                                          &rtsp_st->rtp_payload_data);
 901
 902     if (!rtsp_st->transport_priv) {
 903          return AVERROR(ENOMEM);
 904     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 905         if(rtsp_st->dynamic_handler) {
 906             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 907                                            rtsp_st->dynamic_protocol_context,
 908                                            rtsp_st->dynamic_handler);
 909         }
 910     }
 911
 912     return 0;
 913 }
 914
 915 /**
 916  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 917  */
 918 static int
 919 make_setup_request (AVFormatContext *s, const char *host, int port,
 920                     int lower_transport, const char *real_challenge)
 921 {
 922     RTSPState *rt = s->priv_data;
 923     int rtx, j, i, err, interleave = 0;
 924     RTSPStream *rtsp_st;
 925     RTSPMessageHeader reply1, *reply = &reply1;
 926     char cmd[2048];
 927     const char *trans_pref;
 928
 929     if (rt->transport == RTSP_TRANSPORT_RDT)
 930         trans_pref = "x-pn-tng";
 931     else
 932         trans_pref = "RTP/AVP";
 933
 934     /* for each stream, make the setup request */
 935     /* XXX: we assume the same server is used for the control of each
 936        RTSP stream */
 937
 938     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 939         char transport[2048];
 940
 941         /**
 942          * WMS serves all UDP data over a single connection, the RTX, which
 943          * isn't necessarily the first in the SDP but has to be the first
 944          * to be set up, else the second/third SETUP will fail with a 461.
 945          */
 946         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 947              rt->server_type == RTSP_SERVER_WMS) {
 948             if (i == 0) {
 949                 /* rtx first */
 950                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
 951                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
 952                     if (len >= 4 &&
 953                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
 954                         break;
 955                 }
 956                 if (rtx == rt->nb_rtsp_streams)
 957                     return -1; /* no RTX found */
 958                 rtsp_st = rt->rtsp_streams[rtx];
 959             } else
 960                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
 961         } else
 962             rtsp_st = rt->rtsp_streams[i];
 963
 964         /* RTP/UDP */
 965         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 966             char buf[256];
 967
 968             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
 969                 port = reply->transports[0].client_port_min;
 970                 goto have_port;
 971             }
 972
 973             /* first try in specified port range */
 974             if (RTSP_RTP_PORT_MIN != 0) {
 975                 while(j <= RTSP_RTP_PORT_MAX) {
 976                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 977                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 978                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 979                         goto rtp_opened;
 980                     }
 981                 }
 982             }
 983
 984 /*            then try on any port
 985 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 986 **                err = AVERROR_INVALIDDATA;
 987 **                goto fail;
 988 **            }
 989 */
 990
 991         rtp_opened:
 992             port = rtp_get_local_port(rtsp_st->rtp_handle);
 993         have_port:
 994             snprintf(transport, sizeof(transport) - 1,
 995                      "%s/UDP;", trans_pref);
 996             if (rt->server_type != RTSP_SERVER_REAL)
 997                 av_strlcat(transport, "unicast;", sizeof(transport));
 998             av_strlcatf(transport, sizeof(transport),
 999                      "client_port=%d", port);
1000             if (rt->transport == RTSP_TRANSPORT_RTP &&
1001                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1002                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1003         }
1004
1005         /* RTP/TCP */
1006         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1007             /** For WMS streams, the application streams are only used for
1008              * UDP. When trying to set it up for TCP streams, the server
1009              * will return an error. Therefore, we skip those streams. */
1010             if (rt->server_type == RTSP_SERVER_WMS &&
1011                 s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
1012                 continue;
1013             snprintf(transport, sizeof(transport) - 1,
1014                      "%s/TCP;", trans_pref);
1015             if (rt->server_type == RTSP_SERVER_WMS)
1016                 av_strlcat(transport, "unicast;", sizeof(transport));
1017             av_strlcatf(transport, sizeof(transport),
1018                         "interleaved=%d-%d",
1019                         interleave, interleave + 1);
1020             interleave += 2;
1021         }
1022
1023         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1024             snprintf(transport, sizeof(transport) - 1,
1025                      "%s/UDP;multicast", trans_pref);
1026         }
1027         if (rt->server_type == RTSP_SERVER_REAL ||
1028             rt->server_type == RTSP_SERVER_WMS)
1029             av_strlcat(transport, ";mode=play", sizeof(transport));
1030         snprintf(cmd, sizeof(cmd),
1031                  "SETUP %s RTSP/1.0\r\n"
1032                  "Transport: %s\r\n",
1033                  rtsp_st->control_url, transport);
1034         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1035             char real_res[41], real_csum[9];
1036             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1037                                               real_challenge);
1038             av_strlcatf(cmd, sizeof(cmd),
1039                         "If-Match: %s\r\n"
1040                         "RealChallenge2: %s, sd=%s\r\n",
1041                         rt->session_id, real_res, real_csum);
1042         }
1043         rtsp_send_cmd(s, cmd, reply, NULL);
1044         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1045             err = 1;
1046             goto fail;
1047         } else if (reply->status_code != RTSP_STATUS_OK ||
1048                    reply->nb_transports != 1) {
1049             err = AVERROR_INVALIDDATA;
1050             goto fail;
1051         }
1052
1053         /* XXX: same protocol for all streams is required */
1054         if (i > 0) {
1055             if (reply->transports[0].lower_transport != rt->lower_transport ||
1056                 reply->transports[0].transport != rt->transport) {
1057                 err = AVERROR_INVALIDDATA;
1058                 goto fail;
1059             }
1060         } else {
1061             rt->lower_transport = reply->transports[0].lower_transport;
1062             rt->transport = reply->transports[0].transport;
1063         }
1064
1065         /* close RTP connection if not choosen */
1066         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1067             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1068             url_close(rtsp_st->rtp_handle);
1069             rtsp_st->rtp_handle = NULL;
1070         }
1071
1072         switch(reply->transports[0].lower_transport) {
1073         case RTSP_LOWER_TRANSPORT_TCP:
1074             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1075             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1076             break;
1077
1078         case RTSP_LOWER_TRANSPORT_UDP:
1079             {
1080                 char url[1024];
1081
1082                 /* XXX: also use address if specified */
1083                 snprintf(url, sizeof(url), "rtp://%s:%d",
1084                          host, reply->transports[0].server_port_min);
1085                 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1086                     rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1087                     err = AVERROR_INVALIDDATA;
1088                     goto fail;
1089                 }
1090             }
1091             break;
1092         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1093             {
1094                 char url[1024];
1095                 struct in_addr in;
1096
1097                 in.s_addr = htonl(reply->transports[0].destination);
1098                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1099                          inet_ntoa(in),
1100                          reply->transports[0].port_min,
1101                          reply->transports[0].ttl);
1102                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1103                     err = AVERROR_INVALIDDATA;
1104                     goto fail;
1105                 }
1106             }
1107             break;
1108         }
1109
1110         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1111             goto fail;
1112     }
1113
1114     if (rt->server_type == RTSP_SERVER_REAL)
1115         rt->need_subscription = 1;
1116
1117     return 0;
1118
1119 fail:
1120     for (i=0; i<rt->nb_rtsp_streams; i++) {
1121         if (rt->rtsp_streams[i]->rtp_handle) {
1122             url_close(rt->rtsp_streams[i]->rtp_handle);
1123             rt->rtsp_streams[i]->rtp_handle = NULL;
1124         }
1125     }
1126     return err;
1127 }
1128
1129 static int rtsp_read_header(AVFormatContext *s,
1130                             AVFormatParameters *ap)
1131 {
1132     RTSPState *rt = s->priv_data;
1133     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1134     URLContext *rtsp_hd;
1135     int port, ret, err;
1136     RTSPMessageHeader reply1, *reply = &reply1;
1137     unsigned char *content = NULL;
1138     int lower_transport_mask = 0;
1139     char real_challenge[64];
1140
1141     /* extract hostname and port */
1142     url_split(NULL, 0, NULL, 0,
1143               host, sizeof(host), &port, path, sizeof(path), s->filename);
1144     if (port < 0)
1145         port = RTSP_DEFAULT_PORT;
1146
1147     /* search for options */
1148     option_list = strchr(path, '?');
1149     if (option_list) {
1150         /* remove the options from the path */
1151         *option_list++ = 0;
1152         while(option_list) {
1153             /* move the option pointer */
1154             option = option_list;
1155             option_list = strchr(option_list, '&');
1156             if (option_list)
1157                 *(option_list++) = 0;
1158             /* handle the options */
1159             if (strcmp(option, "udp") == 0)
1160                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1161             else if (strcmp(option, "multicast") == 0)
1162                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1163             else if (strcmp(option, "tcp") == 0)
1164                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1165         }
1166     }
1167
1168     if (!lower_transport_mask)
1169         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1170
1171     /* open the tcp connexion */
1172     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1173     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1174         return AVERROR(EIO);
1175     rt->rtsp_hd = rtsp_hd;
1176     rt->seq = 0;
1177
1178     /* request options supported by the server; this also detects server type */
1179     for (rt->server_type = RTSP_SERVER_RTP;;) {
1180         snprintf(cmd, sizeof(cmd),
1181                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1182         if (rt->server_type == RTSP_SERVER_REAL)
1183             av_strlcat(cmd,
1184                        /**
1185                         * The following entries are required for proper
1186                         * streaming from a Realmedia server. They are
1187                         * interdependent in some way although we currently
1188                         * don't quite understand how. Values were copied
1189                         * from mplayer SVN r23589.
1190                         * @param CompanyID is a 16-byte ID in base64
1191                         * @param ClientChallenge is a 16-byte ID in hex
1192                         */
1193                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1194                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1195                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1196                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1197                        sizeof(cmd));
1198         rtsp_send_cmd(s, cmd, reply, NULL);
1199         if (reply->status_code != RTSP_STATUS_OK) {
1200             err = AVERROR_INVALIDDATA;
1201             goto fail;
1202         }
1203
1204         /* detect server type if not standard-compliant RTP */
1205         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1206             rt->server_type = RTSP_SERVER_REAL;
1207             continue;
1208         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1209             rt->server_type = RTSP_SERVER_WMS;
1210         } else if (rt->server_type == RTSP_SERVER_REAL) {
1211             strcpy(real_challenge, reply->real_challenge);
1212         }
1213         break;
1214     }
1215
1216     /* describe the stream */
1217     snprintf(cmd, sizeof(cmd),
1218              "DESCRIBE %s RTSP/1.0\r\n"
1219              "Accept: application/sdp\r\n",
1220              s->filename);
1221     if (rt->server_type == RTSP_SERVER_REAL) {
1222         /**
1223          * The Require: attribute is needed for proper streaming from
1224          * Realmedia servers.
1225          */
1226         av_strlcat(cmd,
1227                    "Require: com.real.retain-entity-for-setup\r\n",
1228                    sizeof(cmd));
1229     }
1230     rtsp_send_cmd(s, cmd, reply, &content);
1231     if (!content) {
1232         err = AVERROR_INVALIDDATA;
1233         goto fail;
1234     }
1235     if (reply->status_code != RTSP_STATUS_OK) {
1236         err = AVERROR_INVALIDDATA;
1237         goto fail;
1238     }
1239
1240     /* now we got the SDP description, we parse it */
1241     ret = sdp_parse(s, (const char *)content);
1242     av_freep(&content);
1243     if (ret < 0) {
1244         err = AVERROR_INVALIDDATA;
1245         goto fail;
1246     }
1247
1248     do {
1249         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1250
1251         err = make_setup_request(s, host, port, lower_transport,
1252                                  rt->server_type == RTSP_SERVER_REAL ?
1253                                      real_challenge : NULL);
1254         if (err < 0)
1255             goto fail;
1256         lower_transport_mask &= ~(1 << lower_transport);
1257         if (lower_transport_mask == 0 && err == 1) {
1258             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1259             goto fail;
1260         }
1261     } while (err);
1262
1263     rt->state = RTSP_STATE_IDLE;
1264     rt->seek_timestamp = 0; /* default is to start stream at position
1265                                zero */
1266     if (ap->initial_pause) {
1267         /* do not start immediately */
1268     } else {
1269         if (rtsp_read_play(s) < 0) {
1270             err = AVERROR_INVALIDDATA;
1271             goto fail;
1272         }
1273     }
1274     return 0;
1275  fail:
1276     rtsp_close_streams(rt);
1277     av_freep(&content);
1278     url_close(rt->rtsp_hd);
1279     return err;
1280 }
1281
1282 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1283                            uint8_t *buf, int buf_size)
1284 {
1285     RTSPState *rt = s->priv_data;
1286     int id, len, i, ret;
1287     RTSPStream *rtsp_st;
1288
1289 #ifdef DEBUG_RTP_TCP
1290     printf("tcp_read_packet:\n");
1291 #endif
1292  redo:
1293     for(;;) {
1294         RTSPMessageHeader reply;
1295
1296         ret = rtsp_read_reply(s, &reply, NULL, 1);
1297         if (ret == -1)
1298             return -1;
1299         if (ret == 1) /* received '$' */
1300             break;
1301         /* XXX: parse message */
1302     }
1303     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1304     if (ret != 3)
1305         return -1;
1306     id = buf[0];
1307     len = AV_RB16(buf + 1);
1308 #ifdef DEBUG_RTP_TCP
1309     printf("id=%d len=%d\n", id, len);
1310 #endif
1311     if (len > buf_size || len < 12)
1312         goto redo;
1313     /* get the data */
1314     ret = url_readbuf(rt->rtsp_hd, buf, len);
1315     if (ret != len)
1316         return -1;
1317     if (rt->transport == RTSP_TRANSPORT_RDT &&
1318         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1319         return -1;
1320
1321     /* find the matching stream */
1322     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1323         rtsp_st = rt->rtsp_streams[i];
1324         if (id >= rtsp_st->interleaved_min &&
1325             id <= rtsp_st->interleaved_max)
1326             goto found;
1327     }
1328     goto redo;
1329  found:
1330     *prtsp_st = rtsp_st;
1331     return len;
1332 }
1333
1334 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1335                            uint8_t *buf, int buf_size)
1336 {
1337     RTSPState *rt = s->priv_data;
1338     RTSPStream *rtsp_st;
1339     fd_set rfds;
1340     int fd, fd_max, n, i, ret, tcp_fd;
1341     struct timeval tv;
1342
1343     for(;;) {
1344         if (url_interrupt_cb())
1345             return AVERROR(EINTR);
1346         FD_ZERO(&rfds);
1347         tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1348         FD_SET(tcp_fd, &rfds);
1349         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1350             rtsp_st = rt->rtsp_streams[i];
1351             if (rtsp_st->rtp_handle) {
1352                 /* currently, we cannot probe RTCP handle because of
1353                  * blocking restrictions */
1354                 fd = url_get_file_handle(rtsp_st->rtp_handle);
1355                 if (fd > fd_max)
1356                     fd_max = fd;
1357                 FD_SET(fd, &rfds);
1358             }
1359         }
1360         tv.tv_sec = 0;
1361         tv.tv_usec = 100 * 1000;
1362         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1363         if (n > 0) {
1364             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1365                 rtsp_st = rt->rtsp_streams[i];
1366                 if (rtsp_st->rtp_handle) {
1367                     fd = url_get_file_handle(rtsp_st->rtp_handle);
1368                     if (FD_ISSET(fd, &rfds)) {
1369                         ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1370                         if (ret > 0) {
1371                             *prtsp_st = rtsp_st;
1372                             return ret;
1373                         }
1374                     }
1375                 }
1376             }
1377             if (FD_ISSET(tcp_fd, &rfds)) {
1378                 RTSPMessageHeader reply;
1379
1380                 rtsp_read_reply(s, &reply, NULL, 0);
1381                 /* XXX: parse message */
1382             }
1383         }
1384     }
1385 }
1386
1387 static int rtsp_read_packet(AVFormatContext *s,
1388                             AVPacket *pkt)
1389 {
1390     RTSPState *rt = s->priv_data;
1391     RTSPStream *rtsp_st;
1392     int ret, len;
1393     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1394
1395     if (rt->server_type == RTSP_SERVER_REAL) {
1396         int i;
1397         RTSPMessageHeader reply1, *reply = &reply1;
1398         enum AVDiscard cache[MAX_STREAMS];
1399         char cmd[1024];
1400
1401         for (i = 0; i < s->nb_streams; i++)
1402             cache[i] = s->streams[i]->discard;
1403
1404         if (!rt->need_subscription) {
1405             if (memcmp (cache, rt->real_setup_cache,
1406                         sizeof(enum AVDiscard) * s->nb_streams)) {
1407                 av_strlcatf(cmd, sizeof(cmd),
1408                             "SET_PARAMETER %s RTSP/1.0\r\n"
1409                             "Unsubscribe: %s\r\n",
1410                             s->filename, rt->last_subscription);
1411                 rtsp_send_cmd(s, cmd, reply, NULL);
1412                 if (reply->status_code != RTSP_STATUS_OK)
1413                     return AVERROR_INVALIDDATA;
1414                 rt->need_subscription = 1;
1415             }
1416         }
1417
1418         if (rt->need_subscription) {
1419             int r, rule_nr, first = 1;
1420
1421             memcpy(rt->real_setup_cache, cache,
1422                    sizeof(enum AVDiscard) * s->nb_streams);
1423             rt->last_subscription[0] = 0;
1424
1425             snprintf(cmd, sizeof(cmd),
1426                      "SET_PARAMETER %s RTSP/1.0\r\n"
1427                      "Subscribe: ",
1428                      s->filename);
1429             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1430                 rule_nr = 0;
1431                 for (r = 0; r < s->nb_streams; r++) {
1432                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1433                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1434                             if (!first)
1435                                 av_strlcat(rt->last_subscription, ",",
1436                                            sizeof(rt->last_subscription));
1437                             ff_rdt_subscribe_rule(
1438                                 rt->last_subscription,
1439                                 sizeof(rt->last_subscription), i, rule_nr);
1440                             first = 0;
1441                         }
1442                         rule_nr++;
1443                     }
1444                 }
1445             }
1446             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1447             rtsp_send_cmd(s, cmd, reply, NULL);
1448             if (reply->status_code != RTSP_STATUS_OK)
1449                 return AVERROR_INVALIDDATA;
1450             rt->need_subscription = 0;
1451
1452             if (rt->state == RTSP_STATE_PLAYING)
1453                 rtsp_read_play (s);
1454         }
1455     }
1456
1457     /* get next frames from the same RTP packet */
1458     if (rt->cur_transport_priv) {
1459         if (rt->transport == RTSP_TRANSPORT_RDT)
1460             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1461         else
1462             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1463         if (ret == 0) {
1464             rt->cur_transport_priv = NULL;
1465             return 0;
1466         } else if (ret == 1) {
1467             return 0;
1468         } else {
1469             rt->cur_transport_priv = NULL;
1470         }
1471     }
1472
1473     /* read next RTP packet */
1474  redo:
1475     switch(rt->lower_transport) {
1476     default:
1477     case RTSP_LOWER_TRANSPORT_TCP:
1478         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1479         break;
1480     case RTSP_LOWER_TRANSPORT_UDP:
1481     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1482         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1483         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1484             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1485         break;
1486     }
1487     if (len < 0)
1488         return len;
1489     if (rt->transport == RTSP_TRANSPORT_RDT)
1490         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1491     else
1492         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1493     if (ret < 0)
1494         goto redo;
1495     if (ret == 1) {
1496         /* more packets may follow, so we save the RTP context */
1497         rt->cur_transport_priv = rtsp_st->transport_priv;
1498     }
1499     return 0;
1500 }
1501
1502 static int rtsp_read_play(AVFormatContext *s)
1503 {
1504     RTSPState *rt = s->priv_data;
1505     RTSPMessageHeader reply1, *reply = &reply1;
1506     char cmd[1024];
1507
1508     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1509
1510     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1511         if (rt->state == RTSP_STATE_PAUSED) {
1512             snprintf(cmd, sizeof(cmd),
1513                      "PLAY %s RTSP/1.0\r\n",
1514                      s->filename);
1515         } else {
1516             snprintf(cmd, sizeof(cmd),
1517                      "PLAY %s RTSP/1.0\r\n"
1518                      "Range: npt=%0.3f-\r\n",
1519                      s->filename,
1520                      (double)rt->seek_timestamp / AV_TIME_BASE);
1521         }
1522         rtsp_send_cmd(s, cmd, reply, NULL);
1523         if (reply->status_code != RTSP_STATUS_OK) {
1524             return -1;
1525         }
1526     }
1527     rt->state = RTSP_STATE_PLAYING;
1528     return 0;
1529 }
1530
1531 /* pause the stream */
1532 static int rtsp_read_pause(AVFormatContext *s)
1533 {
1534     RTSPState *rt = s->priv_data;
1535     RTSPMessageHeader reply1, *reply = &reply1;
1536     char cmd[1024];
1537
1538     rt = s->priv_data;
1539
1540     if (rt->state != RTSP_STATE_PLAYING)
1541         return 0;
1542     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1543         snprintf(cmd, sizeof(cmd),
1544                  "PAUSE %s RTSP/1.0\r\n",
1545                  s->filename);
1546         rtsp_send_cmd(s, cmd, reply, NULL);
1547         if (reply->status_code != RTSP_STATUS_OK) {
1548             return -1;
1549         }
1550     }
1551     rt->state = RTSP_STATE_PAUSED;
1552     return 0;
1553 }
1554
1555 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1556                           int64_t timestamp, int flags)
1557 {
1558     RTSPState *rt = s->priv_data;
1559
1560     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1561     switch(rt->state) {
1562     default:
1563     case RTSP_STATE_IDLE:
1564         break;
1565     case RTSP_STATE_PLAYING:
1566         if (rtsp_read_play(s) != 0)
1567             return -1;
1568         break;
1569     case RTSP_STATE_PAUSED:
1570         rt->state = RTSP_STATE_IDLE;
1571         break;
1572     }
1573     return 0;
1574 }
1575
1576 static int rtsp_read_close(AVFormatContext *s)
1577 {
1578     RTSPState *rt = s->priv_data;
1579     RTSPMessageHeader reply1, *reply = &reply1;
1580     char cmd[1024];
1581
1582 #if 0
1583     /* NOTE: it is valid to flush the buffer here */
1584     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1585         url_fclose(&rt->rtsp_gb);
1586     }
1587 #endif
1588     snprintf(cmd, sizeof(cmd),
1589              "TEARDOWN %s RTSP/1.0\r\n",
1590              s->filename);
1591     rtsp_send_cmd(s, cmd, reply, NULL);
1592
1593     rtsp_close_streams(rt);
1594     url_close(rt->rtsp_hd);
1595     return 0;
1596 }
1597
1598 #if CONFIG_RTSP_DEMUXER
1599 AVInputFormat rtsp_demuxer = {
1600     "rtsp",
1601     NULL_IF_CONFIG_SMALL("RTSP input format"),
1602     sizeof(RTSPState),
1603     rtsp_probe,
1604     rtsp_read_header,
1605     rtsp_read_packet,
1606     rtsp_read_close,
1607     rtsp_read_seek,
1608     .flags = AVFMT_NOFILE,
1609     .read_play = rtsp_read_play,
1610     .read_pause = rtsp_read_pause,
1611 };
1612 #endif
1613
1614 static int sdp_probe(AVProbeData *p1)
1615 {
1616     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1617
1618     /* we look for a line beginning "c=IN IP4" */
1619     while (p < p_end && *p != '\0') {
1620         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1621             return AVPROBE_SCORE_MAX / 2;
1622
1623         while(p < p_end - 1 && *p != '\n') p++;
1624         if (++p >= p_end)
1625             break;
1626         if (*p == '\r')
1627             p++;
1628     }
1629     return 0;
1630 }
1631
1632 #define SDP_MAX_SIZE 8192
1633
1634 static int sdp_read_header(AVFormatContext *s,
1635                            AVFormatParameters *ap)
1636 {
1637     RTSPState *rt = s->priv_data;
1638     RTSPStream *rtsp_st;
1639     int size, i, err;
1640     char *content;
1641     char url[1024];
1642
1643     /* read the whole sdp file */
1644     /* XXX: better loading */
1645     content = av_malloc(SDP_MAX_SIZE);
1646     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1647     if (size <= 0) {
1648         av_free(content);
1649         return AVERROR_INVALIDDATA;
1650     }
1651     content[size] ='\0';
1652
1653     sdp_parse(s, content);
1654     av_free(content);
1655
1656     /* open each RTP stream */
1657     for(i=0;i<rt->nb_rtsp_streams;i++) {
1658         rtsp_st = rt->rtsp_streams[i];
1659
1660         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1661                  inet_ntoa(rtsp_st->sdp_ip),
1662                  rtsp_st->sdp_port,
1663                  rtsp_st->sdp_port,
1664                  rtsp_st->sdp_ttl);
1665         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1666             err = AVERROR_INVALIDDATA;
1667             goto fail;
1668         }
1669         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1670             goto fail;
1671     }
1672     return 0;
1673  fail:
1674     rtsp_close_streams(rt);
1675     return err;
1676 }
1677
1678 static int sdp_read_packet(AVFormatContext *s,
1679                             AVPacket *pkt)
1680 {
1681     return rtsp_read_packet(s, pkt);
1682 }
1683
1684 static int sdp_read_close(AVFormatContext *s)
1685 {
1686     RTSPState *rt = s->priv_data;
1687     rtsp_close_streams(rt);
1688     return 0;
1689 }
1690
1691 #if CONFIG_SDP_DEMUXER
1692 AVInputFormat sdp_demuxer = {
1693     "sdp",
1694     NULL_IF_CONFIG_SMALL("SDP"),
1695     sizeof(RTSPState),
1696     sdp_probe,
1697     sdp_read_header,
1698     sdp_read_packet,
1699     sdp_read_close,
1700 };
1701 #endif
1702
1703 #if CONFIG_REDIR_DEMUXER
1704 /* dummy redirector format (used directly in av_open_input_file now) */
1705 static int redir_probe(AVProbeData *pd)
1706 {
1707     const char *p;
1708     p = pd->buf;
1709     skip_spaces(&p);
1710     if (av_strstart(p, "http://", NULL) ||
1711         av_strstart(p, "rtsp://", NULL))
1712         return AVPROBE_SCORE_MAX;
1713     return 0;
1714 }
1715
1716 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1717 {
1718     char buf[4096], *q;
1719     int c;
1720     AVFormatContext *ic = NULL;
1721     ByteIOContext *f = s->pb;
1722
1723     /* parse each URL and try to open it */
1724     c = url_fgetc(f);
1725     while (c != URL_EOF) {
1726         /* skip spaces */
1727         for(;;) {
1728             if (!redir_isspace(c))
1729                 break;
1730             c = url_fgetc(f);
1731         }
1732         if (c == URL_EOF)
1733             break;
1734         /* record url */
1735         q = buf;
1736         for(;;) {
1737             if (c == URL_EOF || redir_isspace(c))
1738                 break;
1739             if ((q - buf) < sizeof(buf) - 1)
1740                 *q++ = c;
1741             c = url_fgetc(f);
1742         }
1743         *q = '\0';
1744         //printf("URL='%s'\n", buf);
1745         /* try to open the media file */
1746         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1747             break;
1748     }
1749     if (!ic)
1750         return AVERROR(EIO);
1751
1752     *s = *ic;
1753     url_fclose(f);
1754
1755     return 0;
1756 }
1757
1758 AVInputFormat redir_demuxer = {
1759     "redir",
1760     NULL_IF_CONFIG_SMALL("Redirector format"),
1761     0,
1762     redir_probe,
1763     redir_read_header,
1764     NULL,
1765     NULL,
1766 };
1767 #endif