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 #ifdef DEBUG
 343     printf("sdp: %c='%s'\n", letter, buf);
 344 #endif
 345
 346     p = buf;
 347     if (s1->skip_media && letter != 'm')
 348         return;
 349     switch(letter) {
 350     case 'c':
 351         get_word(buf1, sizeof(buf1), &p);
 352         if (strcmp(buf1, "IN") != 0)
 353             return;
 354         get_word(buf1, sizeof(buf1), &p);
 355         if (strcmp(buf1, "IP4") != 0)
 356             return;
 357         get_word_sep(buf1, sizeof(buf1), "/", &p);
 358         if (inet_aton(buf1, &sdp_ip) == 0)
 359             return;
 360         ttl = 16;
 361         if (*p == '/') {
 362             p++;
 363             get_word_sep(buf1, sizeof(buf1), "/", &p);
 364             ttl = atoi(buf1);
 365         }
 366         if (s->nb_streams == 0) {
 367             s1->default_ip = sdp_ip;
 368             s1->default_ttl = ttl;
 369         } else {
 370             st = s->streams[s->nb_streams - 1];
 371             rtsp_st = st->priv_data;
 372             rtsp_st->sdp_ip = sdp_ip;
 373             rtsp_st->sdp_ttl = ttl;
 374         }
 375         break;
 376     case 's':
 377         av_metadata_set(&s->metadata, "title", p);
 378         break;
 379     case 'i':
 380         if (s->nb_streams == 0) {
 381             av_metadata_set(&s->metadata, "comment", p);
 382             break;
 383         }
 384         break;
 385     case 'm':
 386         /* new stream */
 387         s1->skip_media = 0;
 388         get_word(st_type, sizeof(st_type), &p);
 389         if (!strcmp(st_type, "audio")) {
 390             codec_type = CODEC_TYPE_AUDIO;
 391         } else if (!strcmp(st_type, "video")) {
 392             codec_type = CODEC_TYPE_VIDEO;
 393         } else if (!strcmp(st_type, "application")) {
 394             codec_type = CODEC_TYPE_DATA;
 395         } else {
 396             s1->skip_media = 1;
 397             return;
 398         }
 399         rtsp_st = av_mallocz(sizeof(RTSPStream));
 400         if (!rtsp_st)
 401             return;
 402         rtsp_st->stream_index = -1;
 403         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 404
 405         rtsp_st->sdp_ip = s1->default_ip;
 406         rtsp_st->sdp_ttl = s1->default_ttl;
 407
 408         get_word(buf1, sizeof(buf1), &p); /* port */
 409         rtsp_st->sdp_port = atoi(buf1);
 410
 411         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 412
 413         /* XXX: handle list of formats */
 414         get_word(buf1, sizeof(buf1), &p); /* format list */
 415         rtsp_st->sdp_payload_type = atoi(buf1);
 416
 417         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 418             /* no corresponding stream */
 419         } else {
 420             st = av_new_stream(s, 0);
 421             if (!st)
 422                 return;
 423             st->priv_data = rtsp_st;
 424             rtsp_st->stream_index = st->index;
 425             st->codec->codec_type = codec_type;
 426             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 427                 /* if standard payload type, we can find the codec right now */
 428                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 429             }
 430         }
 431         /* put a default control url */
 432         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 433         break;
 434     case 'a':
 435         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 436             char proto[32];
 437             /* get the control url */
 438             st = s->streams[s->nb_streams - 1];
 439             rtsp_st = st->priv_data;
 440
 441             /* XXX: may need to add full url resolution */
 442             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 443             if (proto[0] == '\0') {
 444                 /* relative control URL */
 445                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 446                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 447             } else {
 448                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 449             }
 450         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 451             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 452             get_word(buf1, sizeof(buf1), &p);
 453             payload_type = atoi(buf1);
 454             st = s->streams[s->nb_streams - 1];
 455             rtsp_st = st->priv_data;
 456             sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 457         } else if (av_strstart(p, "fmtp:", &p)) {
 458             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 459             get_word(buf1, sizeof(buf1), &p);
 460             payload_type = atoi(buf1);
 461             for(i = 0; i < s->nb_streams;i++) {
 462                 st = s->streams[i];
 463                 rtsp_st = st->priv_data;
 464                 if (rtsp_st->sdp_payload_type == payload_type) {
 465                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 466                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf)) {
 467                             sdp_parse_fmtp(st, p);
 468                         }
 469                     } else {
 470                         sdp_parse_fmtp(st, p);
 471                     }
 472                 }
 473             }
 474         } else if(av_strstart(p, "framesize:", &p)) {
 475             // let dynamic protocol handlers have a stab at the line.
 476             get_word(buf1, sizeof(buf1), &p);
 477             payload_type = atoi(buf1);
 478             for(i = 0; i < s->nb_streams;i++) {
 479                 st = s->streams[i];
 480                 rtsp_st = st->priv_data;
 481                 if (rtsp_st->sdp_payload_type == payload_type) {
 482                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 483                         rtsp_st->dynamic_handler->parse_sdp_a_line(s, i, rtsp_st->dynamic_protocol_context, buf);
 484                     }
 485                 }
 486             }
 487         } else if(av_strstart(p, "range:", &p)) {
 488             int64_t start, end;
 489
 490             // this is so that seeking on a streamed file can work.
 491             rtsp_parse_range_npt(p, &start, &end);
 492             s->start_time= start;
 493             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 494         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 495             if (atoi(p) == 1)
 496                 rt->transport = RTSP_TRANSPORT_RDT;
 497         } else {
 498             if (rt->server_type == RTSP_SERVER_WMS)
 499                 ff_wms_parse_sdp_a_line(s, p);
 500             if (s->nb_streams > 0) {
 501                 if (rt->server_type == RTSP_SERVER_REAL)
 502                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 503
 504                 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 505                 if (rtsp_st->dynamic_handler &&
 506                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 507                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, s->nb_streams - 1,
 508                         rtsp_st->dynamic_protocol_context, buf);
 509             }
 510         }
 511         break;
 512     }
 513 }
 514
 515 static int sdp_parse(AVFormatContext *s, const char *content)
 516 {
 517     const char *p;
 518     int letter;
 519     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 520      * contain long SDP lines containing complete ASF Headers (several
 521      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 522      * "rulebooks" describing their properties. Therefore, the SDP line
 523      * buffer is large.
 524      *
 525      * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
 526     char buf[16384], *q;
 527     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 528
 529     memset(s1, 0, sizeof(SDPParseState));
 530     p = content;
 531     for(;;) {
 532         skip_spaces(&p);
 533         letter = *p;
 534         if (letter == '\0')
 535             break;
 536         p++;
 537         if (*p != '=')
 538             goto next_line;
 539         p++;
 540         /* get the content */
 541         q = buf;
 542         while (*p != '\n' && *p != '\r' && *p != '\0') {
 543             if ((q - buf) < sizeof(buf) - 1)
 544                 *q++ = *p;
 545             p++;
 546         }
 547         *q = '\0';
 548         sdp_parse_line(s, s1, letter, buf);
 549     next_line:
 550         while (*p != '\n' && *p != '\0')
 551             p++;
 552         if (*p == '\n')
 553             p++;
 554     }
 555     return 0;
 556 }
 557
 558 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 559 {
 560     const char *p;
 561     int v;
 562
 563     p = *pp;
 564     skip_spaces(&p);
 565     v = strtol(p, (char **)&p, 10);
 566     if (*p == '-') {
 567         p++;
 568         *min_ptr = v;
 569         v = strtol(p, (char **)&p, 10);
 570         *max_ptr = v;
 571     } else {
 572         *min_ptr = v;
 573         *max_ptr = v;
 574     }
 575     *pp = p;
 576 }
 577
 578 /* XXX: only one transport specification is parsed */
 579 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
 580 {
 581     char transport_protocol[16];
 582     char profile[16];
 583     char lower_transport[16];
 584     char parameter[16];
 585     RTSPTransportField *th;
 586     char buf[256];
 587
 588     reply->nb_transports = 0;
 589
 590     for(;;) {
 591         skip_spaces(&p);
 592         if (*p == '\0')
 593             break;
 594
 595         th = &reply->transports[reply->nb_transports];
 596
 597         get_word_sep(transport_protocol, sizeof(transport_protocol),
 598                      "/", &p);
 599         if (!strcasecmp (transport_protocol, "rtp")) {
 600             get_word_sep(profile, sizeof(profile), "/;,", &p);
 601             lower_transport[0] = '\0';
 602             /* rtp/avp/<protocol> */
 603             if (*p == '/') {
 604                 get_word_sep(lower_transport, sizeof(lower_transport),
 605                              ";,", &p);
 606             }
 607             th->transport = RTSP_TRANSPORT_RTP;
 608         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 609                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 610             /* x-pn-tng/<protocol> */
 611             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 612             profile[0] = '\0';
 613             th->transport = RTSP_TRANSPORT_RDT;
 614         }
 615         if (!strcasecmp(lower_transport, "TCP"))
 616             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 617         else
 618             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 619
 620         if (*p == ';')
 621             p++;
 622         /* get each parameter */
 623         while (*p != '\0' && *p != ',') {
 624             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 625             if (!strcmp(parameter, "port")) {
 626                 if (*p == '=') {
 627                     p++;
 628                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 629                 }
 630             } else if (!strcmp(parameter, "client_port")) {
 631                 if (*p == '=') {
 632                     p++;
 633                     rtsp_parse_range(&th->client_port_min,
 634                                      &th->client_port_max, &p);
 635                 }
 636             } else if (!strcmp(parameter, "server_port")) {
 637                 if (*p == '=') {
 638                     p++;
 639                     rtsp_parse_range(&th->server_port_min,
 640                                      &th->server_port_max, &p);
 641                 }
 642             } else if (!strcmp(parameter, "interleaved")) {
 643                 if (*p == '=') {
 644                     p++;
 645                     rtsp_parse_range(&th->interleaved_min,
 646                                      &th->interleaved_max, &p);
 647                 }
 648             } else if (!strcmp(parameter, "multicast")) {
 649                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 650                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 651             } else if (!strcmp(parameter, "ttl")) {
 652                 if (*p == '=') {
 653                     p++;
 654                     th->ttl = strtol(p, (char **)&p, 10);
 655                 }
 656             } else if (!strcmp(parameter, "destination")) {
 657                 struct in_addr ipaddr;
 658
 659                 if (*p == '=') {
 660                     p++;
 661                     get_word_sep(buf, sizeof(buf), ";,", &p);
 662                     if (inet_aton(buf, &ipaddr))
 663                         th->destination = ntohl(ipaddr.s_addr);
 664                 }
 665             }
 666             while (*p != ';' && *p != '\0' && *p != ',')
 667                 p++;
 668             if (*p == ';')
 669                 p++;
 670         }
 671         if (*p == ',')
 672             p++;
 673
 674         reply->nb_transports++;
 675     }
 676 }
 677
 678 void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
 679 {
 680     const char *p;
 681
 682     /* NOTE: we do case independent match for broken servers */
 683     p = buf;
 684     if (av_stristart(p, "Session:", &p)) {
 685         int t;
 686         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 687         if (av_stristart(p, ";timeout=", &p) &&
 688             (t = strtol(p, NULL, 10)) > 0) {
 689             reply->timeout = t;
 690         }
 691     } else if (av_stristart(p, "Content-Length:", &p)) {
 692         reply->content_length = strtol(p, NULL, 10);
 693     } else if (av_stristart(p, "Transport:", &p)) {
 694         rtsp_parse_transport(reply, p);
 695     } else if (av_stristart(p, "CSeq:", &p)) {
 696         reply->seq = strtol(p, NULL, 10);
 697     } else if (av_stristart(p, "Range:", &p)) {
 698         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 699     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 700         skip_spaces(&p);
 701         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 702     } else if (av_stristart(p, "Server:", &p)) {
 703         skip_spaces(&p);
 704         av_strlcpy(reply->server, p, sizeof(reply->server));
 705     }
 706 }
 707
 708 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 709 {
 710     int ret, len;
 711
 712     len = 0;
 713     while (len < size) {
 714         ret = url_read(h, buf+len, size-len);
 715         if (ret < 1)
 716             return ret;
 717         len += ret;
 718     }
 719     return len;
 720 }
 721
 722 /* skip a RTP/TCP interleaved packet */
 723 static void rtsp_skip_packet(AVFormatContext *s)
 724 {
 725     RTSPState *rt = s->priv_data;
 726     int ret, len, len1;
 727     uint8_t buf[1024];
 728
 729     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 730     if (ret != 3)
 731         return;
 732     len = AV_RB16(buf + 1);
 733 #ifdef DEBUG
 734     printf("skipping RTP packet len=%d\n", len);
 735 #endif
 736     /* skip payload */
 737     while (len > 0) {
 738         len1 = len;
 739         if (len1 > sizeof(buf))
 740             len1 = sizeof(buf);
 741         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 742         if (ret != len1)
 743             return;
 744         len -= len1;
 745     }
 746 }
 747
 748 /**
 749  * Read a RTSP message from the server, or prepare to read data
 750  * packets if we're reading data interleaved over the TCP/RTSP
 751  * connection as well.
 752  *
 753  * @param s RTSP demuxer context
 754  * @param reply pointer where the RTSP message header will be stored
 755  * @param content_ptr pointer where the RTSP message body, if any, will
 756  *                    be stored (length is in \p reply)
 757  * @param return_on_interleaved_data whether the function may return if we
 758  *                   encounter a data marker ('$'), which precedes data
 759  *                   packets over interleaved TCP/RTSP connections. If this
 760  *                   is set, this function will return 1 after encountering
 761  *                   a '$'. If it is not set, the function will skip any
 762  *                   data packets (if they are encountered), until a reply
 763  *                   has been fully parsed. If no more data is available
 764  *                   without parsing a reply, it will return an error.
 765  *
 766  * @returns 1 if a data packets is ready to be received, -1 on error,
 767  *          and 0 on success.
 768  */
 769 static int
 770 rtsp_read_reply (AVFormatContext *s, RTSPMessageHeader *reply,
 771                  unsigned char **content_ptr, int return_on_interleaved_data)
 772 {
 773     RTSPState *rt = s->priv_data;
 774     char buf[4096], buf1[1024], *q;
 775     unsigned char ch;
 776     const char *p;
 777     int ret, content_length, line_count = 0;
 778     unsigned char *content = NULL;
 779
 780     memset(reply, 0, sizeof(*reply));
 781
 782     /* parse reply (XXX: use buffers) */
 783     rt->last_reply[0] = '\0';
 784     for(;;) {
 785         q = buf;
 786         for(;;) {
 787             ret = url_readbuf(rt->rtsp_hd, &ch, 1);
 788 #ifdef DEBUG_RTP_TCP
 789             printf("ret=%d c=%02x [%c]\n", ret, ch, ch);
 790 #endif
 791             if (ret != 1)
 792                 return -1;
 793             if (ch == '\n')
 794                 break;
 795             if (ch == '$') {
 796                 /* XXX: only parse it if first char on line ? */
 797                 if (return_on_interleaved_data) {
 798                     return 1;
 799                 } else
 800                 rtsp_skip_packet(s);
 801             } else if (ch != '\r') {
 802                 if ((q - buf) < sizeof(buf) - 1)
 803                     *q++ = ch;
 804             }
 805         }
 806         *q = '\0';
 807 #ifdef DEBUG
 808         printf("line='%s'\n", buf);
 809 #endif
 810         /* test if last line */
 811         if (buf[0] == '\0')
 812             break;
 813         p = buf;
 814         if (line_count == 0) {
 815             /* get reply code */
 816             get_word(buf1, sizeof(buf1), &p);
 817             get_word(buf1, sizeof(buf1), &p);
 818             reply->status_code = atoi(buf1);
 819         } else {
 820             rtsp_parse_line(reply, p);
 821             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 822             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 823         }
 824         line_count++;
 825     }
 826
 827     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 828         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 829
 830     content_length = reply->content_length;
 831     if (content_length > 0) {
 832         /* leave some room for a trailing '\0' (useful for simple parsing) */
 833         content = av_malloc(content_length + 1);
 834         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 835         content[content_length] = '\0';
 836     }
 837     if (content_ptr)
 838         *content_ptr = content;
 839     else
 840         av_free(content);
 841
 842     return 0;
 843 }
 844
 845 static void rtsp_send_cmd_async (AVFormatContext *s,
 846                           const char *cmd, RTSPMessageHeader *reply,
 847                           unsigned char **content_ptr)
 848 {
 849     RTSPState *rt = s->priv_data;
 850     char buf[4096], buf1[1024];
 851
 852     rt->seq++;
 853     av_strlcpy(buf, cmd, sizeof(buf));
 854     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 855     av_strlcat(buf, buf1, sizeof(buf));
 856     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 857         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 858         av_strlcat(buf, buf1, sizeof(buf));
 859     }
 860     av_strlcat(buf, "\r\n", sizeof(buf));
 861 #ifdef DEBUG
 862     printf("Sending:\n%s--\n", buf);
 863 #endif
 864     url_write(rt->rtsp_hd, buf, strlen(buf));
 865     rt->last_cmd_time = av_gettime();
 866 }
 867
 868 static void rtsp_send_cmd (AVFormatContext *s,
 869                            const char *cmd, RTSPMessageHeader *reply,
 870                            unsigned char **content_ptr)
 871 {
 872     rtsp_send_cmd_async(s, cmd, reply, content_ptr);
 873
 874     rtsp_read_reply(s, reply, content_ptr, 0);
 875 }
 876
 877
 878 /* close and free RTSP streams */
 879 static void rtsp_close_streams(RTSPState *rt)
 880 {
 881     int i;
 882     RTSPStream *rtsp_st;
 883
 884     for(i=0;i<rt->nb_rtsp_streams;i++) {
 885         rtsp_st = rt->rtsp_streams[i];
 886         if (rtsp_st) {
 887             if (rtsp_st->transport_priv) {
 888                 if (rt->transport == RTSP_TRANSPORT_RDT)
 889                     ff_rdt_parse_close(rtsp_st->transport_priv);
 890                 else
 891                     rtp_parse_close(rtsp_st->transport_priv);
 892             }
 893             if (rtsp_st->rtp_handle)
 894                 url_close(rtsp_st->rtp_handle);
 895             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 896                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 897         }
 898     }
 899     av_free(rt->rtsp_streams);
 900     if (rt->asf_ctx) {
 901         av_close_input_stream (rt->asf_ctx);
 902         rt->asf_ctx = NULL;
 903     }
 904 }
 905
 906 static int
 907 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 908 {
 909     RTSPState *rt = s->priv_data;
 910     AVStream *st = NULL;
 911
 912     /* open the RTP context */
 913     if (rtsp_st->stream_index >= 0)
 914         st = s->streams[rtsp_st->stream_index];
 915     if (!st)
 916         s->ctx_flags |= AVFMTCTX_NOHEADER;
 917
 918     if (rt->transport == RTSP_TRANSPORT_RDT)
 919         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 920                                             rtsp_st->dynamic_protocol_context,
 921                                             rtsp_st->dynamic_handler);
 922     else
 923         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 924                                          rtsp_st->sdp_payload_type,
 925                                          &rtsp_st->rtp_payload_data);
 926
 927     if (!rtsp_st->transport_priv) {
 928          return AVERROR(ENOMEM);
 929     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 930         if(rtsp_st->dynamic_handler) {
 931             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 932                                            rtsp_st->dynamic_protocol_context,
 933                                            rtsp_st->dynamic_handler);
 934         }
 935     }
 936
 937     return 0;
 938 }
 939
 940 /**
 941  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 942  */
 943 static int
 944 make_setup_request (AVFormatContext *s, const char *host, int port,
 945                     int lower_transport, const char *real_challenge)
 946 {
 947     RTSPState *rt = s->priv_data;
 948     int rtx, j, i, err, interleave = 0;
 949     RTSPStream *rtsp_st;
 950     RTSPMessageHeader reply1, *reply = &reply1;
 951     char cmd[2048];
 952     const char *trans_pref;
 953
 954     if (rt->transport == RTSP_TRANSPORT_RDT)
 955         trans_pref = "x-pn-tng";
 956     else
 957         trans_pref = "RTP/AVP";
 958
 959     /* default timeout: 1 minute */
 960     rt->timeout = 60;
 961
 962     /* for each stream, make the setup request */
 963     /* XXX: we assume the same server is used for the control of each
 964        RTSP stream */
 965
 966     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 967         char transport[2048];
 968
 969         /**
 970          * WMS serves all UDP data over a single connection, the RTX, which
 971          * isn't necessarily the first in the SDP but has to be the first
 972          * to be set up, else the second/third SETUP will fail with a 461.
 973          */
 974         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 975              rt->server_type == RTSP_SERVER_WMS) {
 976             if (i == 0) {
 977                 /* rtx first */
 978                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
 979                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
 980                     if (len >= 4 &&
 981                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4, "/rtx"))
 982                         break;
 983                 }
 984                 if (rtx == rt->nb_rtsp_streams)
 985                     return -1; /* no RTX found */
 986                 rtsp_st = rt->rtsp_streams[rtx];
 987             } else
 988                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
 989         } else
 990             rtsp_st = rt->rtsp_streams[i];
 991
 992         /* RTP/UDP */
 993         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 994             char buf[256];
 995
 996             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
 997                 port = reply->transports[0].client_port_min;
 998                 goto have_port;
 999             }
1000
1001             /* first try in specified port range */
1002             if (RTSP_RTP_PORT_MIN != 0) {
1003                 while(j <= RTSP_RTP_PORT_MAX) {
1004                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
1005                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
1006                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
1007                         goto rtp_opened;
1008                     }
1009                 }
1010             }
1011
1012 /*            then try on any port
1013 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1014 **                err = AVERROR_INVALIDDATA;
1015 **                goto fail;
1016 **            }
1017 */
1018
1019         rtp_opened:
1020             port = rtp_get_local_port(rtsp_st->rtp_handle);
1021         have_port:
1022             snprintf(transport, sizeof(transport) - 1,
1023                      "%s/UDP;", trans_pref);
1024             if (rt->server_type != RTSP_SERVER_REAL)
1025                 av_strlcat(transport, "unicast;", sizeof(transport));
1026             av_strlcatf(transport, sizeof(transport),
1027                      "client_port=%d", port);
1028             if (rt->transport == RTSP_TRANSPORT_RTP &&
1029                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1030                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1031         }
1032
1033         /* RTP/TCP */
1034         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1035             /** For WMS streams, the application streams are only used for
1036              * UDP. When trying to set it up for TCP streams, the server
1037              * will return an error. Therefore, we skip those streams. */
1038             if (rt->server_type == RTSP_SERVER_WMS &&
1039                 s->streams[rtsp_st->stream_index]->codec->codec_type == CODEC_TYPE_DATA)
1040                 continue;
1041             snprintf(transport, sizeof(transport) - 1,
1042                      "%s/TCP;", trans_pref);
1043             if (rt->server_type == RTSP_SERVER_WMS)
1044                 av_strlcat(transport, "unicast;", sizeof(transport));
1045             av_strlcatf(transport, sizeof(transport),
1046                         "interleaved=%d-%d",
1047                         interleave, interleave + 1);
1048             interleave += 2;
1049         }
1050
1051         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1052             snprintf(transport, sizeof(transport) - 1,
1053                      "%s/UDP;multicast", trans_pref);
1054         }
1055         if (rt->server_type == RTSP_SERVER_REAL ||
1056             rt->server_type == RTSP_SERVER_WMS)
1057             av_strlcat(transport, ";mode=play", sizeof(transport));
1058         snprintf(cmd, sizeof(cmd),
1059                  "SETUP %s RTSP/1.0\r\n"
1060                  "Transport: %s\r\n",
1061                  rtsp_st->control_url, transport);
1062         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1063             char real_res[41], real_csum[9];
1064             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1065                                               real_challenge);
1066             av_strlcatf(cmd, sizeof(cmd),
1067                         "If-Match: %s\r\n"
1068                         "RealChallenge2: %s, sd=%s\r\n",
1069                         rt->session_id, real_res, real_csum);
1070         }
1071         rtsp_send_cmd(s, cmd, reply, NULL);
1072         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1073             err = 1;
1074             goto fail;
1075         } else if (reply->status_code != RTSP_STATUS_OK ||
1076                    reply->nb_transports != 1) {
1077             err = AVERROR_INVALIDDATA;
1078             goto fail;
1079         }
1080
1081         /* XXX: same protocol for all streams is required */
1082         if (i > 0) {
1083             if (reply->transports[0].lower_transport != rt->lower_transport ||
1084                 reply->transports[0].transport != rt->transport) {
1085                 err = AVERROR_INVALIDDATA;
1086                 goto fail;
1087             }
1088         } else {
1089             rt->lower_transport = reply->transports[0].lower_transport;
1090             rt->transport = reply->transports[0].transport;
1091         }
1092
1093         /* close RTP connection if not choosen */
1094         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1095             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1096             url_close(rtsp_st->rtp_handle);
1097             rtsp_st->rtp_handle = NULL;
1098         }
1099
1100         switch(reply->transports[0].lower_transport) {
1101         case RTSP_LOWER_TRANSPORT_TCP:
1102             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1103             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1104             break;
1105
1106         case RTSP_LOWER_TRANSPORT_UDP:
1107             {
1108                 char url[1024];
1109
1110                 /* XXX: also use address if specified */
1111                 snprintf(url, sizeof(url), "rtp://%s:%d",
1112                          host, reply->transports[0].server_port_min);
1113                 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1114                     rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1115                     err = AVERROR_INVALIDDATA;
1116                     goto fail;
1117                 }
1118             }
1119             break;
1120         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1121             {
1122                 char url[1024];
1123                 struct in_addr in;
1124
1125                 in.s_addr = htonl(reply->transports[0].destination);
1126                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1127                          inet_ntoa(in),
1128                          reply->transports[0].port_min,
1129                          reply->transports[0].ttl);
1130                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1131                     err = AVERROR_INVALIDDATA;
1132                     goto fail;
1133                 }
1134             }
1135             break;
1136         }
1137
1138         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1139             goto fail;
1140     }
1141
1142     if (reply->timeout > 0)
1143         rt->timeout = reply->timeout;
1144
1145     if (rt->server_type == RTSP_SERVER_REAL)
1146         rt->need_subscription = 1;
1147
1148     return 0;
1149
1150 fail:
1151     for (i=0; i<rt->nb_rtsp_streams; i++) {
1152         if (rt->rtsp_streams[i]->rtp_handle) {
1153             url_close(rt->rtsp_streams[i]->rtp_handle);
1154             rt->rtsp_streams[i]->rtp_handle = NULL;
1155         }
1156     }
1157     return err;
1158 }
1159
1160 static int rtsp_read_header(AVFormatContext *s,
1161                             AVFormatParameters *ap)
1162 {
1163     RTSPState *rt = s->priv_data;
1164     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1165     URLContext *rtsp_hd;
1166     int port, ret, err;
1167     RTSPMessageHeader reply1, *reply = &reply1;
1168     unsigned char *content = NULL;
1169     int lower_transport_mask = 0;
1170     char real_challenge[64];
1171
1172     /* extract hostname and port */
1173     url_split(NULL, 0, NULL, 0,
1174               host, sizeof(host), &port, path, sizeof(path), s->filename);
1175     if (port < 0)
1176         port = RTSP_DEFAULT_PORT;
1177
1178     /* search for options */
1179     option_list = strchr(path, '?');
1180     if (option_list) {
1181         /* remove the options from the path */
1182         *option_list++ = 0;
1183         while(option_list) {
1184             /* move the option pointer */
1185             option = option_list;
1186             option_list = strchr(option_list, '&');
1187             if (option_list)
1188                 *(option_list++) = 0;
1189             /* handle the options */
1190             if (strcmp(option, "udp") == 0)
1191                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1192             else if (strcmp(option, "multicast") == 0)
1193                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1194             else if (strcmp(option, "tcp") == 0)
1195                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1196         }
1197     }
1198
1199     if (!lower_transport_mask)
1200         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1201
1202     /* open the tcp connexion */
1203     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1204     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1205         return AVERROR(EIO);
1206     rt->rtsp_hd = rtsp_hd;
1207     rt->seq = 0;
1208
1209     /* request options supported by the server; this also detects server type */
1210     for (rt->server_type = RTSP_SERVER_RTP;;) {
1211         snprintf(cmd, sizeof(cmd),
1212                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1213         if (rt->server_type == RTSP_SERVER_REAL)
1214             av_strlcat(cmd,
1215                        /**
1216                         * The following entries are required for proper
1217                         * streaming from a Realmedia server. They are
1218                         * interdependent in some way although we currently
1219                         * don't quite understand how. Values were copied
1220                         * from mplayer SVN r23589.
1221                         * @param CompanyID is a 16-byte ID in base64
1222                         * @param ClientChallenge is a 16-byte ID in hex
1223                         */
1224                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1225                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1226                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1227                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1228                        sizeof(cmd));
1229         rtsp_send_cmd(s, cmd, reply, NULL);
1230         if (reply->status_code != RTSP_STATUS_OK) {
1231             err = AVERROR_INVALIDDATA;
1232             goto fail;
1233         }
1234
1235         /* detect server type if not standard-compliant RTP */
1236         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1237             rt->server_type = RTSP_SERVER_REAL;
1238             continue;
1239         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1240             rt->server_type = RTSP_SERVER_WMS;
1241         } else if (rt->server_type == RTSP_SERVER_REAL) {
1242             strcpy(real_challenge, reply->real_challenge);
1243         }
1244         break;
1245     }
1246
1247     /* describe the stream */
1248     snprintf(cmd, sizeof(cmd),
1249              "DESCRIBE %s RTSP/1.0\r\n"
1250              "Accept: application/sdp\r\n",
1251              s->filename);
1252     if (rt->server_type == RTSP_SERVER_REAL) {
1253         /**
1254          * The Require: attribute is needed for proper streaming from
1255          * Realmedia servers.
1256          */
1257         av_strlcat(cmd,
1258                    "Require: com.real.retain-entity-for-setup\r\n",
1259                    sizeof(cmd));
1260     }
1261     rtsp_send_cmd(s, cmd, reply, &content);
1262     if (!content) {
1263         err = AVERROR_INVALIDDATA;
1264         goto fail;
1265     }
1266     if (reply->status_code != RTSP_STATUS_OK) {
1267         err = AVERROR_INVALIDDATA;
1268         goto fail;
1269     }
1270
1271     /* now we got the SDP description, we parse it */
1272     ret = sdp_parse(s, (const char *)content);
1273     av_freep(&content);
1274     if (ret < 0) {
1275         err = AVERROR_INVALIDDATA;
1276         goto fail;
1277     }
1278
1279     do {
1280         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1281
1282         err = make_setup_request(s, host, port, lower_transport,
1283                                  rt->server_type == RTSP_SERVER_REAL ?
1284                                      real_challenge : NULL);
1285         if (err < 0)
1286             goto fail;
1287         lower_transport_mask &= ~(1 << lower_transport);
1288         if (lower_transport_mask == 0 && err == 1) {
1289             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1290             goto fail;
1291         }
1292     } while (err);
1293
1294     rt->state = RTSP_STATE_IDLE;
1295     rt->seek_timestamp = 0; /* default is to start stream at position
1296                                zero */
1297     if (ap->initial_pause) {
1298         /* do not start immediately */
1299     } else {
1300         if (rtsp_read_play(s) < 0) {
1301             err = AVERROR_INVALIDDATA;
1302             goto fail;
1303         }
1304     }
1305     return 0;
1306  fail:
1307     rtsp_close_streams(rt);
1308     av_freep(&content);
1309     url_close(rt->rtsp_hd);
1310     return err;
1311 }
1312
1313 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1314                            uint8_t *buf, int buf_size)
1315 {
1316     RTSPState *rt = s->priv_data;
1317     int id, len, i, ret;
1318     RTSPStream *rtsp_st;
1319
1320 #ifdef DEBUG_RTP_TCP
1321     printf("tcp_read_packet:\n");
1322 #endif
1323  redo:
1324     for(;;) {
1325         RTSPMessageHeader reply;
1326
1327         ret = rtsp_read_reply(s, &reply, NULL, 1);
1328         if (ret == -1)
1329             return -1;
1330         if (ret == 1) /* received '$' */
1331             break;
1332         /* XXX: parse message */
1333     }
1334     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1335     if (ret != 3)
1336         return -1;
1337     id = buf[0];
1338     len = AV_RB16(buf + 1);
1339 #ifdef DEBUG_RTP_TCP
1340     printf("id=%d len=%d\n", id, len);
1341 #endif
1342     if (len > buf_size || len < 12)
1343         goto redo;
1344     /* get the data */
1345     ret = url_readbuf(rt->rtsp_hd, buf, len);
1346     if (ret != len)
1347         return -1;
1348     if (rt->transport == RTSP_TRANSPORT_RDT &&
1349         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1350         return -1;
1351
1352     /* find the matching stream */
1353     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1354         rtsp_st = rt->rtsp_streams[i];
1355         if (id >= rtsp_st->interleaved_min &&
1356             id <= rtsp_st->interleaved_max)
1357             goto found;
1358     }
1359     goto redo;
1360  found:
1361     *prtsp_st = rtsp_st;
1362     return len;
1363 }
1364
1365 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1366                            uint8_t *buf, int buf_size)
1367 {
1368     RTSPState *rt = s->priv_data;
1369     RTSPStream *rtsp_st;
1370     fd_set rfds;
1371     int fd, fd_max, n, i, ret, tcp_fd;
1372     struct timeval tv;
1373
1374     for(;;) {
1375         if (url_interrupt_cb())
1376             return AVERROR(EINTR);
1377         FD_ZERO(&rfds);
1378         tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1379         FD_SET(tcp_fd, &rfds);
1380         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1381             rtsp_st = rt->rtsp_streams[i];
1382             if (rtsp_st->rtp_handle) {
1383                 /* currently, we cannot probe RTCP handle because of
1384                  * blocking restrictions */
1385                 fd = url_get_file_handle(rtsp_st->rtp_handle);
1386                 if (fd > fd_max)
1387                     fd_max = fd;
1388                 FD_SET(fd, &rfds);
1389             }
1390         }
1391         tv.tv_sec = 0;
1392         tv.tv_usec = 100 * 1000;
1393         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1394         if (n > 0) {
1395             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1396                 rtsp_st = rt->rtsp_streams[i];
1397                 if (rtsp_st->rtp_handle) {
1398                     fd = url_get_file_handle(rtsp_st->rtp_handle);
1399                     if (FD_ISSET(fd, &rfds)) {
1400                         ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1401                         if (ret > 0) {
1402                             *prtsp_st = rtsp_st;
1403                             return ret;
1404                         }
1405                     }
1406                 }
1407             }
1408             if (FD_ISSET(tcp_fd, &rfds)) {
1409                 RTSPMessageHeader reply;
1410
1411                 rtsp_read_reply(s, &reply, NULL, 0);
1412                 /* XXX: parse message */
1413             }
1414         }
1415     }
1416 }
1417
1418 static int rtsp_read_packet(AVFormatContext *s,
1419                             AVPacket *pkt)
1420 {
1421     RTSPState *rt = s->priv_data;
1422     RTSPStream *rtsp_st;
1423     int ret, len;
1424     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1425     RTSPMessageHeader reply1, *reply = &reply1;
1426     char cmd[1024];
1427
1428     if (rt->server_type == RTSP_SERVER_REAL) {
1429         int i;
1430         enum AVDiscard cache[MAX_STREAMS];
1431
1432         for (i = 0; i < s->nb_streams; i++)
1433             cache[i] = s->streams[i]->discard;
1434
1435         if (!rt->need_subscription) {
1436             if (memcmp (cache, rt->real_setup_cache,
1437                         sizeof(enum AVDiscard) * s->nb_streams)) {
1438                 av_strlcatf(cmd, sizeof(cmd),
1439                             "SET_PARAMETER %s RTSP/1.0\r\n"
1440                             "Unsubscribe: %s\r\n",
1441                             s->filename, rt->last_subscription);
1442                 rtsp_send_cmd(s, cmd, reply, NULL);
1443                 if (reply->status_code != RTSP_STATUS_OK)
1444                     return AVERROR_INVALIDDATA;
1445                 rt->need_subscription = 1;
1446             }
1447         }
1448
1449         if (rt->need_subscription) {
1450             int r, rule_nr, first = 1;
1451
1452             memcpy(rt->real_setup_cache, cache,
1453                    sizeof(enum AVDiscard) * s->nb_streams);
1454             rt->last_subscription[0] = 0;
1455
1456             snprintf(cmd, sizeof(cmd),
1457                      "SET_PARAMETER %s RTSP/1.0\r\n"
1458                      "Subscribe: ",
1459                      s->filename);
1460             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1461                 rule_nr = 0;
1462                 for (r = 0; r < s->nb_streams; r++) {
1463                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1464                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1465                             if (!first)
1466                                 av_strlcat(rt->last_subscription, ",",
1467                                            sizeof(rt->last_subscription));
1468                             ff_rdt_subscribe_rule(
1469                                 rt->last_subscription,
1470                                 sizeof(rt->last_subscription), i, rule_nr);
1471                             first = 0;
1472                         }
1473                         rule_nr++;
1474                     }
1475                 }
1476             }
1477             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1478             rtsp_send_cmd(s, cmd, reply, NULL);
1479             if (reply->status_code != RTSP_STATUS_OK)
1480                 return AVERROR_INVALIDDATA;
1481             rt->need_subscription = 0;
1482
1483             if (rt->state == RTSP_STATE_PLAYING)
1484                 rtsp_read_play (s);
1485         }
1486     }
1487
1488     /* get next frames from the same RTP packet */
1489     if (rt->cur_transport_priv) {
1490         if (rt->transport == RTSP_TRANSPORT_RDT)
1491             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1492         else
1493             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1494         if (ret == 0) {
1495             rt->cur_transport_priv = NULL;
1496             return 0;
1497         } else if (ret == 1) {
1498             return 0;
1499         } else {
1500             rt->cur_transport_priv = NULL;
1501         }
1502     }
1503
1504     /* read next RTP packet */
1505  redo:
1506     switch(rt->lower_transport) {
1507     default:
1508     case RTSP_LOWER_TRANSPORT_TCP:
1509         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1510         break;
1511     case RTSP_LOWER_TRANSPORT_UDP:
1512     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1513         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1514         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1515             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1516         break;
1517     }
1518     if (len < 0)
1519         return len;
1520     if (rt->transport == RTSP_TRANSPORT_RDT)
1521         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1522     else
1523         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1524     if (ret < 0)
1525         goto redo;
1526     if (ret == 1) {
1527         /* more packets may follow, so we save the RTP context */
1528         rt->cur_transport_priv = rtsp_st->transport_priv;
1529     }
1530
1531     /* send dummy request to keep TCP connection alive */
1532     if ((rt->server_type == RTSP_SERVER_WMS ||
1533          rt->server_type == RTSP_SERVER_REAL) &&
1534         (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1535         if (rt->server_type == RTSP_SERVER_WMS) {
1536             snprintf(cmd, sizeof(cmd) - 1,
1537                      "GET_PARAMETER %s RTSP/1.0\r\n",
1538                      s->filename);
1539             rtsp_send_cmd_async(s, cmd, reply, NULL);
1540         } else {
1541             rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n",
1542                                 reply, NULL);
1543         }
1544     }
1545
1546     return 0;
1547 }
1548
1549 static int rtsp_read_play(AVFormatContext *s)
1550 {
1551     RTSPState *rt = s->priv_data;
1552     RTSPMessageHeader reply1, *reply = &reply1;
1553     char cmd[1024];
1554
1555     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1556
1557     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1558         if (rt->state == RTSP_STATE_PAUSED) {
1559             snprintf(cmd, sizeof(cmd),
1560                      "PLAY %s RTSP/1.0\r\n",
1561                      s->filename);
1562         } else {
1563             snprintf(cmd, sizeof(cmd),
1564                      "PLAY %s RTSP/1.0\r\n"
1565                      "Range: npt=%0.3f-\r\n",
1566                      s->filename,
1567                      (double)rt->seek_timestamp / AV_TIME_BASE);
1568         }
1569         rtsp_send_cmd(s, cmd, reply, NULL);
1570         if (reply->status_code != RTSP_STATUS_OK) {
1571             return -1;
1572         }
1573     }
1574     rt->state = RTSP_STATE_PLAYING;
1575     return 0;
1576 }
1577
1578 /* pause the stream */
1579 static int rtsp_read_pause(AVFormatContext *s)
1580 {
1581     RTSPState *rt = s->priv_data;
1582     RTSPMessageHeader reply1, *reply = &reply1;
1583     char cmd[1024];
1584
1585     rt = s->priv_data;
1586
1587     if (rt->state != RTSP_STATE_PLAYING)
1588         return 0;
1589     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1590         snprintf(cmd, sizeof(cmd),
1591                  "PAUSE %s RTSP/1.0\r\n",
1592                  s->filename);
1593         rtsp_send_cmd(s, cmd, reply, NULL);
1594         if (reply->status_code != RTSP_STATUS_OK) {
1595             return -1;
1596         }
1597     }
1598     rt->state = RTSP_STATE_PAUSED;
1599     return 0;
1600 }
1601
1602 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1603                           int64_t timestamp, int flags)
1604 {
1605     RTSPState *rt = s->priv_data;
1606
1607     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1608     switch(rt->state) {
1609     default:
1610     case RTSP_STATE_IDLE:
1611         break;
1612     case RTSP_STATE_PLAYING:
1613         if (rtsp_read_play(s) != 0)
1614             return -1;
1615         break;
1616     case RTSP_STATE_PAUSED:
1617         rt->state = RTSP_STATE_IDLE;
1618         break;
1619     }
1620     return 0;
1621 }
1622
1623 static int rtsp_read_close(AVFormatContext *s)
1624 {
1625     RTSPState *rt = s->priv_data;
1626     RTSPMessageHeader reply1, *reply = &reply1;
1627     char cmd[1024];
1628
1629 #if 0
1630     /* NOTE: it is valid to flush the buffer here */
1631     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1632         url_fclose(&rt->rtsp_gb);
1633     }
1634 #endif
1635     snprintf(cmd, sizeof(cmd),
1636              "TEARDOWN %s RTSP/1.0\r\n",
1637              s->filename);
1638     rtsp_send_cmd(s, cmd, reply, NULL);
1639
1640     rtsp_close_streams(rt);
1641     url_close(rt->rtsp_hd);
1642     return 0;
1643 }
1644
1645 #if CONFIG_RTSP_DEMUXER
1646 AVInputFormat rtsp_demuxer = {
1647     "rtsp",
1648     NULL_IF_CONFIG_SMALL("RTSP input format"),
1649     sizeof(RTSPState),
1650     rtsp_probe,
1651     rtsp_read_header,
1652     rtsp_read_packet,
1653     rtsp_read_close,
1654     rtsp_read_seek,
1655     .flags = AVFMT_NOFILE,
1656     .read_play = rtsp_read_play,
1657     .read_pause = rtsp_read_pause,
1658 };
1659 #endif
1660
1661 static int sdp_probe(AVProbeData *p1)
1662 {
1663     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1664
1665     /* we look for a line beginning "c=IN IP4" */
1666     while (p < p_end && *p != '\0') {
1667         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1668             return AVPROBE_SCORE_MAX / 2;
1669
1670         while(p < p_end - 1 && *p != '\n') p++;
1671         if (++p >= p_end)
1672             break;
1673         if (*p == '\r')
1674             p++;
1675     }
1676     return 0;
1677 }
1678
1679 #define SDP_MAX_SIZE 8192
1680
1681 static int sdp_read_header(AVFormatContext *s,
1682                            AVFormatParameters *ap)
1683 {
1684     RTSPState *rt = s->priv_data;
1685     RTSPStream *rtsp_st;
1686     int size, i, err;
1687     char *content;
1688     char url[1024];
1689
1690     /* read the whole sdp file */
1691     /* XXX: better loading */
1692     content = av_malloc(SDP_MAX_SIZE);
1693     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1694     if (size <= 0) {
1695         av_free(content);
1696         return AVERROR_INVALIDDATA;
1697     }
1698     content[size] ='\0';
1699
1700     sdp_parse(s, content);
1701     av_free(content);
1702
1703     /* open each RTP stream */
1704     for(i=0;i<rt->nb_rtsp_streams;i++) {
1705         rtsp_st = rt->rtsp_streams[i];
1706
1707         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1708                  inet_ntoa(rtsp_st->sdp_ip),
1709                  rtsp_st->sdp_port,
1710                  rtsp_st->sdp_port,
1711                  rtsp_st->sdp_ttl);
1712         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1713             err = AVERROR_INVALIDDATA;
1714             goto fail;
1715         }
1716         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1717             goto fail;
1718     }
1719     return 0;
1720  fail:
1721     rtsp_close_streams(rt);
1722     return err;
1723 }
1724
1725 static int sdp_read_packet(AVFormatContext *s,
1726                             AVPacket *pkt)
1727 {
1728     return rtsp_read_packet(s, pkt);
1729 }
1730
1731 static int sdp_read_close(AVFormatContext *s)
1732 {
1733     RTSPState *rt = s->priv_data;
1734     rtsp_close_streams(rt);
1735     return 0;
1736 }
1737
1738 #if CONFIG_SDP_DEMUXER
1739 AVInputFormat sdp_demuxer = {
1740     "sdp",
1741     NULL_IF_CONFIG_SMALL("SDP"),
1742     sizeof(RTSPState),
1743     sdp_probe,
1744     sdp_read_header,
1745     sdp_read_packet,
1746     sdp_read_close,
1747 };
1748 #endif
1749
1750 #if CONFIG_REDIR_DEMUXER
1751 /* dummy redirector format (used directly in av_open_input_file now) */
1752 static int redir_probe(AVProbeData *pd)
1753 {
1754     const char *p;
1755     p = pd->buf;
1756     skip_spaces(&p);
1757     if (av_strstart(p, "http://", NULL) ||
1758         av_strstart(p, "rtsp://", NULL))
1759         return AVPROBE_SCORE_MAX;
1760     return 0;
1761 }
1762
1763 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1764 {
1765     char buf[4096], *q;
1766     int c;
1767     AVFormatContext *ic = NULL;
1768     ByteIOContext *f = s->pb;
1769
1770     /* parse each URL and try to open it */
1771     c = url_fgetc(f);
1772     while (c != URL_EOF) {
1773         /* skip spaces */
1774         for(;;) {
1775             if (!redir_isspace(c))
1776                 break;
1777             c = url_fgetc(f);
1778         }
1779         if (c == URL_EOF)
1780             break;
1781         /* record url */
1782         q = buf;
1783         for(;;) {
1784             if (c == URL_EOF || redir_isspace(c))
1785                 break;
1786             if ((q - buf) < sizeof(buf) - 1)
1787                 *q++ = c;
1788             c = url_fgetc(f);
1789         }
1790         *q = '\0';
1791         //printf("URL='%s'\n", buf);
1792         /* try to open the media file */
1793         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1794             break;
1795     }
1796     if (!ic)
1797         return AVERROR(EIO);
1798
1799     *s = *ic;
1800     url_fclose(f);
1801
1802     return 0;
1803 }
1804
1805 AVInputFormat redir_demuxer = {
1806     "redir",
1807     NULL_IF_CONFIG_SMALL("Redirector format"),
1808     0,
1809     redir_probe,
1810     redir_read_header,
1811     NULL,
1812     NULL,
1813 };
1814 #endif