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 "avformat.h"
  27
  28 #include <sys/time.h>
  29 #ifdef HAVE_SYS_SELECT_H
  30 #include <sys/select.h>
  31 #endif
  32 #include <strings.h>
  33 #include "network.h"
  34 #include "rtsp.h"
  35
  36 #include "rtp_internal.h"
  37 #include "rdt.h"
  38
  39 //#define DEBUG
  40 //#define DEBUG_RTP_TCP
  41
  42 enum RTSPClientState {
  43     RTSP_STATE_IDLE,
  44     RTSP_STATE_PLAYING,
  45     RTSP_STATE_PAUSED,
  46 };
  47
  48 enum RTSPServerType {
  49     RTSP_SERVER_RTP,  /*< Standard-compliant RTP-server */
  50     RTSP_SERVER_REAL, /*< Realmedia-style server */
  51     RTSP_SERVER_LAST
  52 };
  53
  54 typedef struct RTSPState {
  55     URLContext *rtsp_hd; /* RTSP TCP connexion handle */
  56     int nb_rtsp_streams;
  57     struct RTSPStream **rtsp_streams;
  58
  59     enum RTSPClientState state;
  60     int64_t seek_timestamp;
  61
  62     /* XXX: currently we use unbuffered input */
  63     //    ByteIOContext rtsp_gb;
  64     int seq;        /* RTSP command sequence number */
  65     char session_id[512];
  66     enum RTSPProtocol protocol;
  67     enum RTSPServerType server_type;
  68     char last_reply[2048]; /* XXX: allocate ? */
  69     RTPDemuxContext *cur_rtp;
  70     int need_subscription;
  71 } RTSPState;
  72
  73 typedef struct RTSPStream {
  74     URLContext *rtp_handle; /* RTP stream handle */
  75     RTPDemuxContext *rtp_ctx; /* RTP parse context */
  76
  77     int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
  78     int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
  79     char control_url[1024]; /* url for this stream (from SDP) */
  80
  81     int sdp_port; /* port (from SDP content - not used in RTSP) */
  82     struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
  83     int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
  84     int sdp_payload_type; /* payload type - only used in SDP */
  85     rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
  86
  87     RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
  88     void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
  89 } RTSPStream;
  90
  91 static int rtsp_read_play(AVFormatContext *s);
  92
  93 /* XXX: currently, the only way to change the protocols consists in
  94    changing this variable */
  95
  96 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  97 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
  98 #endif
  99
 100 static int rtsp_probe(AVProbeData *p)
 101 {
 102     if (av_strstart(p->filename, "rtsp:", NULL))
 103         return AVPROBE_SCORE_MAX;
 104     return 0;
 105 }
 106
 107 static int redir_isspace(int c)
 108 {
 109     return c == ' ' || c == '\t' || c == '\n' || c == '\r';
 110 }
 111
 112 static void skip_spaces(const char **pp)
 113 {
 114     const char *p;
 115     p = *pp;
 116     while (redir_isspace(*p))
 117         p++;
 118     *pp = p;
 119 }
 120
 121 static void get_word_sep(char *buf, int buf_size, const char *sep,
 122                          const char **pp)
 123 {
 124     const char *p;
 125     char *q;
 126
 127     p = *pp;
 128     if (*p == '/')
 129         p++;
 130     skip_spaces(&p);
 131     q = buf;
 132     while (!strchr(sep, *p) && *p != '\0') {
 133         if ((q - buf) < buf_size - 1)
 134             *q++ = *p;
 135         p++;
 136     }
 137     if (buf_size > 0)
 138         *q = '\0';
 139     *pp = p;
 140 }
 141
 142 static void get_word(char *buf, int buf_size, const char **pp)
 143 {
 144     const char *p;
 145     char *q;
 146
 147     p = *pp;
 148     skip_spaces(&p);
 149     q = buf;
 150     while (!redir_isspace(*p) && *p != '\0') {
 151         if ((q - buf) < buf_size - 1)
 152             *q++ = *p;
 153         p++;
 154     }
 155     if (buf_size > 0)
 156         *q = '\0';
 157     *pp = p;
 158 }
 159
 160 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 161    params>] */
 162 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 163 {
 164     char buf[256];
 165     int i;
 166     AVCodec *c;
 167     const char *c_name;
 168
 169     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 170        see if we can handle this kind of payload */
 171     get_word_sep(buf, sizeof(buf), "/", &p);
 172     if (payload_type >= RTP_PT_PRIVATE) {
 173         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 174         while(handler) {
 175             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 176                 codec->codec_id = handler->codec_id;
 177                 rtsp_st->dynamic_handler= handler;
 178                 if(handler->open) {
 179                     rtsp_st->dynamic_protocol_context= handler->open();
 180                 }
 181                 break;
 182             }
 183             handler= handler->next;
 184         }
 185     } else {
 186         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 187         /* search into AVRtpPayloadTypes[] */
 188         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 189     }
 190
 191     c = avcodec_find_decoder(codec->codec_id);
 192     if (c && c->name)
 193         c_name = c->name;
 194     else
 195         c_name = (char *)NULL;
 196
 197     if (c_name) {
 198         get_word_sep(buf, sizeof(buf), "/", &p);
 199         i = atoi(buf);
 200         switch (codec->codec_type) {
 201             case CODEC_TYPE_AUDIO:
 202                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 203                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 204                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 205                 if (i > 0) {
 206                     codec->sample_rate = i;
 207                     get_word_sep(buf, sizeof(buf), "/", &p);
 208                     i = atoi(buf);
 209                     if (i > 0)
 210                         codec->channels = i;
 211                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 212                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 213                 }
 214                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 215                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 216                 break;
 217             case CODEC_TYPE_VIDEO:
 218                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 219                 break;
 220             default:
 221                 break;
 222         }
 223         return 0;
 224     }
 225
 226     return -1;
 227 }
 228
 229 /* return the length and optionnaly the data */
 230 static int hex_to_data(uint8_t *data, const char *p)
 231 {
 232     int c, len, v;
 233
 234     len = 0;
 235     v = 1;
 236     for(;;) {
 237         skip_spaces(&p);
 238         if (p == '\0')
 239             break;
 240         c = toupper((unsigned char)*p++);
 241         if (c >= '0' && c <= '9')
 242             c = c - '0';
 243         else if (c >= 'A' && c <= 'F')
 244             c = c - 'A' + 10;
 245         else
 246             break;
 247         v = (v << 4) | c;
 248         if (v & 0x100) {
 249             if (data)
 250                 data[len] = v;
 251             len++;
 252             v = 1;
 253         }
 254     }
 255     return len;
 256 }
 257
 258 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 259 {
 260     switch (codec->codec_id) {
 261         case CODEC_ID_MPEG4:
 262         case CODEC_ID_AAC:
 263             if (!strcmp(attr, "config")) {
 264                 /* decode the hexa encoded parameter */
 265                 int len = hex_to_data(NULL, value);
 266                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 267                 if (!codec->extradata)
 268                     return;
 269                 codec->extradata_size = len;
 270                 hex_to_data(codec->extradata, value);
 271             }
 272             break;
 273         default:
 274             break;
 275     }
 276     return;
 277 }
 278
 279 typedef struct attrname_map
 280 {
 281     const char *str;
 282     uint16_t type;
 283     uint32_t offset;
 284 } attrname_map_t;
 285
 286 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 287 #define ATTR_NAME_TYPE_INT 0
 288 #define ATTR_NAME_TYPE_STR 1
 289 static attrname_map_t attr_names[]=
 290 {
 291     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
 292     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
 293     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
 294     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
 295     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
 296     {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
 297     {NULL, -1, -1},
 298 };
 299
 300 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 301 * because it is used in rtp_h264.c, which is forthcoming.
 302 */
 303 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 304 {
 305     skip_spaces(p);
 306     if(**p)
 307     {
 308         get_word_sep(attr, attr_size, "=", p);
 309         if (**p == '=')
 310             (*p)++;
 311         get_word_sep(value, value_size, ";", p);
 312         if (**p == ';')
 313             (*p)++;
 314         return 1;
 315     }
 316     return 0;
 317 }
 318
 319 /* parse a SDP line and save stream attributes */
 320 static void sdp_parse_fmtp(AVStream *st, const char *p)
 321 {
 322     char attr[256];
 323     char value[4096];
 324     int i;
 325
 326     RTSPStream *rtsp_st = st->priv_data;
 327     AVCodecContext *codec = st->codec;
 328     rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
 329
 330     /* loop on each attribute */
 331     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 332     {
 333         /* grab the codec extra_data from the config parameter of the fmtp line */
 334         sdp_parse_fmtp_config(codec, attr, value);
 335         /* Looking for a known attribute */
 336         for (i = 0; attr_names[i].str; ++i) {
 337             if (!strcasecmp(attr, attr_names[i].str)) {
 338                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 339                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 340                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 341                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 342             }
 343         }
 344     }
 345 }
 346
 347 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 348  *  and end time.
 349  *  Used for seeking in the rtp stream.
 350  */
 351 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 352 {
 353     char buf[256];
 354
 355     skip_spaces(&p);
 356     if (!av_stristart(p, "npt=", &p))
 357         return;
 358
 359     *start = AV_NOPTS_VALUE;
 360     *end = AV_NOPTS_VALUE;
 361
 362     get_word_sep(buf, sizeof(buf), "-", &p);
 363     *start = parse_date(buf, 1);
 364     if (*p == '-') {
 365         p++;
 366         get_word_sep(buf, sizeof(buf), "-", &p);
 367         *end = parse_date(buf, 1);
 368     }
 369 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 370 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 371 }
 372
 373 typedef struct SDPParseState {
 374     /* SDP only */
 375     struct in_addr default_ip;
 376     int default_ttl;
 377 } SDPParseState;
 378
 379 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 380                            int letter, const char *buf)
 381 {
 382     RTSPState *rt = s->priv_data;
 383     char buf1[64], st_type[64];
 384     const char *p;
 385     int codec_type, payload_type, i;
 386     AVStream *st;
 387     RTSPStream *rtsp_st;
 388     struct in_addr sdp_ip;
 389     int ttl;
 390
 391 #ifdef DEBUG
 392     printf("sdp: %c='%s'\n", letter, buf);
 393 #endif
 394
 395     p = buf;
 396     switch(letter) {
 397     case 'c':
 398         get_word(buf1, sizeof(buf1), &p);
 399         if (strcmp(buf1, "IN") != 0)
 400             return;
 401         get_word(buf1, sizeof(buf1), &p);
 402         if (strcmp(buf1, "IP4") != 0)
 403             return;
 404         get_word_sep(buf1, sizeof(buf1), "/", &p);
 405         if (inet_aton(buf1, &sdp_ip) == 0)
 406             return;
 407         ttl = 16;
 408         if (*p == '/') {
 409             p++;
 410             get_word_sep(buf1, sizeof(buf1), "/", &p);
 411             ttl = atoi(buf1);
 412         }
 413         if (s->nb_streams == 0) {
 414             s1->default_ip = sdp_ip;
 415             s1->default_ttl = ttl;
 416         } else {
 417             st = s->streams[s->nb_streams - 1];
 418             rtsp_st = st->priv_data;
 419             rtsp_st->sdp_ip = sdp_ip;
 420             rtsp_st->sdp_ttl = ttl;
 421         }
 422         break;
 423     case 's':
 424         av_strlcpy(s->title, p, sizeof(s->title));
 425         break;
 426     case 'i':
 427         if (s->nb_streams == 0) {
 428             av_strlcpy(s->comment, p, sizeof(s->comment));
 429             break;
 430         }
 431         break;
 432     case 'm':
 433         /* new stream */
 434         get_word(st_type, sizeof(st_type), &p);
 435         if (!strcmp(st_type, "audio")) {
 436             codec_type = CODEC_TYPE_AUDIO;
 437         } else if (!strcmp(st_type, "video")) {
 438             codec_type = CODEC_TYPE_VIDEO;
 439         } else {
 440             return;
 441         }
 442         rtsp_st = av_mallocz(sizeof(RTSPStream));
 443         if (!rtsp_st)
 444             return;
 445         rtsp_st->stream_index = -1;
 446         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 447
 448         rtsp_st->sdp_ip = s1->default_ip;
 449         rtsp_st->sdp_ttl = s1->default_ttl;
 450
 451         get_word(buf1, sizeof(buf1), &p); /* port */
 452         rtsp_st->sdp_port = atoi(buf1);
 453
 454         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 455
 456         /* XXX: handle list of formats */
 457         get_word(buf1, sizeof(buf1), &p); /* format list */
 458         rtsp_st->sdp_payload_type = atoi(buf1);
 459
 460         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 461             /* no corresponding stream */
 462         } else {
 463             st = av_new_stream(s, 0);
 464             if (!st)
 465                 return;
 466             st->priv_data = rtsp_st;
 467             rtsp_st->stream_index = st->index;
 468             st->codec->codec_type = codec_type;
 469             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 470                 /* if standard payload type, we can find the codec right now */
 471                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 472             }
 473         }
 474         /* put a default control url */
 475         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 476         break;
 477     case 'a':
 478         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 479             char proto[32];
 480             /* get the control url */
 481             st = s->streams[s->nb_streams - 1];
 482             rtsp_st = st->priv_data;
 483
 484             /* XXX: may need to add full url resolution */
 485             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 486             if (proto[0] == '\0') {
 487                 /* relative control URL */
 488                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 489                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 490             } else {
 491                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 492             }
 493         } else if (av_strstart(p, "rtpmap:", &p)) {
 494             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 495             get_word(buf1, sizeof(buf1), &p);
 496             payload_type = atoi(buf1);
 497             for(i = 0; i < s->nb_streams;i++) {
 498                 st = s->streams[i];
 499                 rtsp_st = st->priv_data;
 500                 if (rtsp_st->sdp_payload_type == payload_type) {
 501                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 502                 }
 503             }
 504         } else if (av_strstart(p, "fmtp:", &p)) {
 505             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 506             get_word(buf1, sizeof(buf1), &p);
 507             payload_type = atoi(buf1);
 508             for(i = 0; i < s->nb_streams;i++) {
 509                 st = s->streams[i];
 510                 rtsp_st = st->priv_data;
 511                 if (rtsp_st->sdp_payload_type == payload_type) {
 512                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 513                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 514                             sdp_parse_fmtp(st, p);
 515                         }
 516                     } else {
 517                         sdp_parse_fmtp(st, p);
 518                     }
 519                 }
 520             }
 521         } else if(av_strstart(p, "framesize:", &p)) {
 522             // let dynamic protocol handlers have a stab at the line.
 523             get_word(buf1, sizeof(buf1), &p);
 524             payload_type = atoi(buf1);
 525             for(i = 0; i < s->nb_streams;i++) {
 526                 st = s->streams[i];
 527                 rtsp_st = st->priv_data;
 528                 if (rtsp_st->sdp_payload_type == payload_type) {
 529                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 530                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 531                     }
 532                 }
 533             }
 534         } else if(av_strstart(p, "range:", &p)) {
 535             int64_t start, end;
 536
 537             // this is so that seeking on a streamed file can work.
 538             rtsp_parse_range_npt(p, &start, &end);
 539             s->start_time= start;
 540             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 541         } else if (s->nb_streams > 0) {
 542             rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 543             if (rtsp_st->dynamic_handler &&
 544                 rtsp_st->dynamic_handler->parse_sdp_a_line)
 545                 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
 546                     rtsp_st->dynamic_protocol_context, buf);
 547         }
 548         break;
 549     }
 550 }
 551
 552 static int sdp_parse(AVFormatContext *s, const char *content)
 553 {
 554     const char *p;
 555     int letter;
 556     char buf[2048], *q;
 557     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 558
 559     memset(s1, 0, sizeof(SDPParseState));
 560     p = content;
 561     for(;;) {
 562         skip_spaces(&p);
 563         letter = *p;
 564         if (letter == '\0')
 565             break;
 566         p++;
 567         if (*p != '=')
 568             goto next_line;
 569         p++;
 570         /* get the content */
 571         q = buf;
 572         while (*p != '\n' && *p != '\r' && *p != '\0') {
 573             if ((q - buf) < sizeof(buf) - 1)
 574                 *q++ = *p;
 575             p++;
 576         }
 577         *q = '\0';
 578         sdp_parse_line(s, s1, letter, buf);
 579     next_line:
 580         while (*p != '\n' && *p != '\0')
 581             p++;
 582         if (*p == '\n')
 583             p++;
 584     }
 585     return 0;
 586 }
 587
 588 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 589 {
 590     const char *p;
 591     int v;
 592
 593     p = *pp;
 594     skip_spaces(&p);
 595     v = strtol(p, (char **)&p, 10);
 596     if (*p == '-') {
 597         p++;
 598         *min_ptr = v;
 599         v = strtol(p, (char **)&p, 10);
 600         *max_ptr = v;
 601     } else {
 602         *min_ptr = v;
 603         *max_ptr = v;
 604     }
 605     *pp = p;
 606 }
 607
 608 /* XXX: only one transport specification is parsed */
 609 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 610 {
 611     char transport_protocol[16];
 612     char profile[16];
 613     char lower_transport[16];
 614     char parameter[16];
 615     RTSPTransportField *th;
 616     char buf[256];
 617
 618     reply->nb_transports = 0;
 619
 620     for(;;) {
 621         skip_spaces(&p);
 622         if (*p == '\0')
 623             break;
 624
 625         th = &reply->transports[reply->nb_transports];
 626
 627         get_word_sep(transport_protocol, sizeof(transport_protocol),
 628                      "/", &p);
 629         if (*p == '/')
 630             p++;
 631         if (!strcasecmp (transport_protocol, "rtp")) {
 632             get_word_sep(profile, sizeof(profile), "/;,", &p);
 633             lower_transport[0] = '\0';
 634             /* rtp/avp/<protocol> */
 635             if (*p == '/') {
 636                 p++;
 637                 get_word_sep(lower_transport, sizeof(lower_transport),
 638                              ";,", &p);
 639                 }
 640         } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
 641             /* x-pn-tng/<protocol> */
 642             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 643             profile[0] = '\0';
 644         }
 645         if (!strcasecmp(lower_transport, "TCP"))
 646             th->protocol = RTSP_PROTOCOL_RTP_TCP;
 647         else
 648             th->protocol = RTSP_PROTOCOL_RTP_UDP;
 649
 650         if (*p == ';')
 651             p++;
 652         /* get each parameter */
 653         while (*p != '\0' && *p != ',') {
 654             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 655             if (!strcmp(parameter, "port")) {
 656                 if (*p == '=') {
 657                     p++;
 658                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 659                 }
 660             } else if (!strcmp(parameter, "client_port")) {
 661                 if (*p == '=') {
 662                     p++;
 663                     rtsp_parse_range(&th->client_port_min,
 664                                      &th->client_port_max, &p);
 665                 }
 666             } else if (!strcmp(parameter, "server_port")) {
 667                 if (*p == '=') {
 668                     p++;
 669                     rtsp_parse_range(&th->server_port_min,
 670                                      &th->server_port_max, &p);
 671                 }
 672             } else if (!strcmp(parameter, "interleaved")) {
 673                 if (*p == '=') {
 674                     p++;
 675                     rtsp_parse_range(&th->interleaved_min,
 676                                      &th->interleaved_max, &p);
 677                 }
 678             } else if (!strcmp(parameter, "multicast")) {
 679                 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
 680                     th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
 681             } else if (!strcmp(parameter, "ttl")) {
 682                 if (*p == '=') {
 683                     p++;
 684                     th->ttl = strtol(p, (char **)&p, 10);
 685                 }
 686             } else if (!strcmp(parameter, "destination")) {
 687                 struct in_addr ipaddr;
 688
 689                 if (*p == '=') {
 690                     p++;
 691                     get_word_sep(buf, sizeof(buf), ";,", &p);
 692                     if (inet_aton(buf, &ipaddr))
 693                         th->destination = ntohl(ipaddr.s_addr);
 694                 }
 695             }
 696             while (*p != ';' && *p != '\0' && *p != ',')
 697                 p++;
 698             if (*p == ';')
 699                 p++;
 700         }
 701         if (*p == ',')
 702             p++;
 703
 704         reply->nb_transports++;
 705     }
 706 }
 707
 708 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 709 {
 710     const char *p;
 711
 712     /* NOTE: we do case independent match for broken servers */
 713     p = buf;
 714     if (av_stristart(p, "Session:", &p)) {
 715         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 716     } else if (av_stristart(p, "Content-Length:", &p)) {
 717         reply->content_length = strtol(p, NULL, 10);
 718     } else if (av_stristart(p, "Transport:", &p)) {
 719         rtsp_parse_transport(reply, p);
 720     } else if (av_stristart(p, "CSeq:", &p)) {
 721         reply->seq = strtol(p, NULL, 10);
 722     } else if (av_stristart(p, "Range:", &p)) {
 723         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 724     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 725         skip_spaces(&p);
 726         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 727     }
 728 }
 729
 730 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 731 {
 732     int ret, len;
 733
 734     len = 0;
 735     while (len < size) {
 736         ret = url_read(h, buf+len, size-len);
 737         if (ret < 1)
 738             return ret;
 739         len += ret;
 740     }
 741     return len;
 742 }
 743
 744 /* skip a RTP/TCP interleaved packet */
 745 static void rtsp_skip_packet(AVFormatContext *s)
 746 {
 747     RTSPState *rt = s->priv_data;
 748     int ret, len, len1;
 749     uint8_t buf[1024];
 750
 751     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 752     if (ret != 3)
 753         return;
 754     len = AV_RB16(buf + 1);
 755 #ifdef DEBUG
 756     printf("skipping RTP packet len=%d\n", len);
 757 #endif
 758     /* skip payload */
 759     while (len > 0) {
 760         len1 = len;
 761         if (len1 > sizeof(buf))
 762             len1 = sizeof(buf);
 763         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 764         if (ret != len1)
 765             return;
 766         len -= len1;
 767     }
 768 }
 769
 770 static void rtsp_send_cmd(AVFormatContext *s,
 771                           const char *cmd, RTSPHeader *reply,
 772                           unsigned char **content_ptr)
 773 {
 774     RTSPState *rt = s->priv_data;
 775     char buf[4096], buf1[1024], *q;
 776     unsigned char ch;
 777     const char *p;
 778     int content_length, line_count;
 779     unsigned char *content = NULL;
 780
 781     memset(reply, 0, sizeof(RTSPHeader));
 782
 783     rt->seq++;
 784     av_strlcpy(buf, cmd, sizeof(buf));
 785     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 786     av_strlcat(buf, buf1, sizeof(buf));
 787     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 788         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 789         av_strlcat(buf, buf1, sizeof(buf));
 790     }
 791     av_strlcat(buf, "\r\n", sizeof(buf));
 792 #ifdef DEBUG
 793     printf("Sending:\n%s--\n", buf);
 794 #endif
 795     url_write(rt->rtsp_hd, buf, strlen(buf));
 796
 797     /* parse reply (XXX: use buffers) */
 798     line_count = 0;
 799     rt->last_reply[0] = '\0';
 800     for(;;) {
 801         q = buf;
 802         for(;;) {
 803             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 804                 break;
 805             if (ch == '\n')
 806                 break;
 807             if (ch == '$') {
 808                 /* XXX: only parse it if first char on line ? */
 809                 rtsp_skip_packet(s);
 810             } else if (ch != '\r') {
 811                 if ((q - buf) < sizeof(buf) - 1)
 812                     *q++ = ch;
 813             }
 814         }
 815         *q = '\0';
 816 #ifdef DEBUG
 817         printf("line='%s'\n", buf);
 818 #endif
 819         /* test if last line */
 820         if (buf[0] == '\0')
 821             break;
 822         p = buf;
 823         if (line_count == 0) {
 824             /* get reply code */
 825             get_word(buf1, sizeof(buf1), &p);
 826             get_word(buf1, sizeof(buf1), &p);
 827             reply->status_code = atoi(buf1);
 828         } else {
 829             rtsp_parse_line(reply, p);
 830             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 831             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 832         }
 833         line_count++;
 834     }
 835
 836     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 837         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 838
 839     content_length = reply->content_length;
 840     if (content_length > 0) {
 841         /* leave some room for a trailing '\0' (useful for simple parsing) */
 842         content = av_malloc(content_length + 1);
 843         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 844         content[content_length] = '\0';
 845     }
 846     if (content_ptr)
 847         *content_ptr = content;
 848     else
 849         av_free(content);
 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->rtp_ctx)
 863                 rtp_parse_close(rtsp_st->rtp_ctx);
 864             if (rtsp_st->rtp_handle)
 865                 url_close(rtsp_st->rtp_handle);
 866             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 867                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 868         }
 869     }
 870     av_free(rt->rtsp_streams);
 871 }
 872
 873 static int
 874 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 875 {
 876     AVStream *st = NULL;
 877
 878     /* open the RTP context */
 879     if (rtsp_st->stream_index >= 0)
 880         st = s->streams[rtsp_st->stream_index];
 881     if (!st)
 882         s->ctx_flags |= AVFMTCTX_NOHEADER;
 883     rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
 884
 885     if (!rtsp_st->rtp_ctx) {
 886          return AVERROR(ENOMEM);
 887     } else {
 888         if(rtsp_st->dynamic_handler) {
 889             rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
 890             rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
 891         }
 892     }
 893
 894     return 0;
 895 }
 896
 897 /**
 898  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 899  */
 900 static int
 901 make_setup_request (AVFormatContext *s, const char *host, int port,
 902                     int protocol, const char *real_challenge)
 903 {
 904     RTSPState *rt = s->priv_data;
 905     int j, i, err;
 906     RTSPStream *rtsp_st;
 907     RTSPHeader reply1, *reply = &reply1;
 908     char cmd[2048];
 909     const char *trans_pref;
 910
 911     if (rt->server_type == RTSP_SERVER_REAL)
 912         trans_pref = "x-pn-tng";
 913     else
 914         trans_pref = "RTP/AVP";
 915
 916     /* for each stream, make the setup request */
 917     /* XXX: we assume the same server is used for the control of each
 918        RTSP stream */
 919
 920     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 921         char transport[2048];
 922
 923         rtsp_st = rt->rtsp_streams[i];
 924
 925         /* RTP/UDP */
 926         if (protocol == RTSP_PROTOCOL_RTP_UDP) {
 927             char buf[256];
 928
 929             /* first try in specified port range */
 930             if (RTSP_RTP_PORT_MIN != 0) {
 931                 while(j <= RTSP_RTP_PORT_MAX) {
 932                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 933                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 934                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 935                         goto rtp_opened;
 936                     }
 937                 }
 938             }
 939
 940 /*            then try on any port
 941 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 942 **                err = AVERROR_INVALIDDATA;
 943 **                goto fail;
 944 **            }
 945 */
 946
 947         rtp_opened:
 948             port = rtp_get_local_port(rtsp_st->rtp_handle);
 949             snprintf(transport, sizeof(transport) - 1,
 950                      "%s/UDP;unicast;client_port=%d",
 951                      trans_pref, port);
 952             if (rt->server_type == RTSP_SERVER_RTP)
 953                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
 954         }
 955
 956         /* RTP/TCP */
 957         else if (protocol == RTSP_PROTOCOL_RTP_TCP) {
 958             snprintf(transport, sizeof(transport) - 1,
 959                      "%s/TCP", trans_pref);
 960         }
 961
 962         else if (protocol == RTSP_PROTOCOL_RTP_UDP_MULTICAST) {
 963             snprintf(transport, sizeof(transport) - 1,
 964                      "%s/UDP;multicast", trans_pref);
 965         }
 966         if (rt->server_type == RTSP_SERVER_REAL)
 967             av_strlcat(transport, ";mode=play", sizeof(transport));
 968         snprintf(cmd, sizeof(cmd),
 969                  "SETUP %s RTSP/1.0\r\n"
 970                  "Transport: %s\r\n",
 971                  rtsp_st->control_url, transport);
 972         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
 973             char real_res[41], real_csum[9];
 974             ff_rdt_calc_response_and_checksum(real_res, real_csum,
 975                                               real_challenge);
 976             av_strlcatf(cmd, sizeof(cmd),
 977                         "If-Match: %s\r\n"
 978                         "RealChallenge2: %s, sd=%s\r\n",
 979                         rt->session_id, real_res, real_csum);
 980         }
 981         rtsp_send_cmd(s, cmd, reply, NULL);
 982         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
 983             err = 1;
 984             goto fail;
 985         } else if (reply->status_code != RTSP_STATUS_OK ||
 986                    reply->nb_transports != 1) {
 987             err = AVERROR_INVALIDDATA;
 988             goto fail;
 989         }
 990
 991         /* XXX: same protocol for all streams is required */
 992         if (i > 0) {
 993             if (reply->transports[0].protocol != rt->protocol) {
 994                 err = AVERROR_INVALIDDATA;
 995                 goto fail;
 996             }
 997         } else {
 998             rt->protocol = reply->transports[0].protocol;
 999         }
1000
1001         /* close RTP connection if not choosen */
1002         if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
1003             (protocol == RTSP_PROTOCOL_RTP_UDP)) {
1004             url_close(rtsp_st->rtp_handle);
1005             rtsp_st->rtp_handle = NULL;
1006         }
1007
1008         switch(reply->transports[0].protocol) {
1009         case RTSP_PROTOCOL_RTP_TCP:
1010             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1011             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1012             break;
1013
1014         case RTSP_PROTOCOL_RTP_UDP:
1015             {
1016                 char url[1024];
1017
1018                 /* XXX: also use address if specified */
1019                 snprintf(url, sizeof(url), "rtp://%s:%d",
1020                          host, reply->transports[0].server_port_min);
1021                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1022                     err = AVERROR_INVALIDDATA;
1023                     goto fail;
1024                 }
1025             }
1026             break;
1027         case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1028             {
1029                 char url[1024];
1030                 struct in_addr in;
1031
1032                 in.s_addr = htonl(reply->transports[0].destination);
1033                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1034                          inet_ntoa(in),
1035                          reply->transports[0].port_min,
1036                          reply->transports[0].ttl);
1037                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1038                     err = AVERROR_INVALIDDATA;
1039                     goto fail;
1040                 }
1041             }
1042             break;
1043         }
1044
1045         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1046             goto fail;
1047     }
1048
1049     if (rt->server_type == RTSP_SERVER_REAL)
1050         rt->need_subscription = 1;
1051
1052     return 0;
1053
1054 fail:
1055     for (i=0; i<rt->nb_rtsp_streams; i++) {
1056         if (rt->rtsp_streams[i]->rtp_handle) {
1057             url_close(rt->rtsp_streams[i]->rtp_handle);
1058             rt->rtsp_streams[i]->rtp_handle = NULL;
1059         }
1060     }
1061     return err;
1062 }
1063
1064 static int rtsp_read_header(AVFormatContext *s,
1065                             AVFormatParameters *ap)
1066 {
1067     RTSPState *rt = s->priv_data;
1068     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1069     URLContext *rtsp_hd;
1070     int port, ret, err;
1071     RTSPHeader reply1, *reply = &reply1;
1072     unsigned char *content = NULL;
1073     int protocol_mask = 0;
1074     char real_challenge[64];
1075
1076     /* extract hostname and port */
1077     url_split(NULL, 0, NULL, 0,
1078               host, sizeof(host), &port, path, sizeof(path), s->filename);
1079     if (port < 0)
1080         port = RTSP_DEFAULT_PORT;
1081
1082     /* search for options */
1083     option_list = strchr(path, '?');
1084     if (option_list) {
1085         /* remove the options from the path */
1086         *option_list++ = 0;
1087         while(option_list) {
1088             /* move the option pointer */
1089             option = option_list;
1090             option_list = strchr(option_list, '&');
1091             if (option_list)
1092                 *(option_list++) = 0;
1093             /* handle the options */
1094             if (strcmp(option, "udp") == 0)
1095                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
1096             else if (strcmp(option, "multicast") == 0)
1097                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
1098             else if (strcmp(option, "tcp") == 0)
1099                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
1100         }
1101     }
1102
1103     if (!protocol_mask)
1104         protocol_mask = (1 << RTSP_PROTOCOL_RTP_LAST) - 1;
1105
1106     /* open the tcp connexion */
1107     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1108     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1109         return AVERROR(EIO);
1110     rt->rtsp_hd = rtsp_hd;
1111     rt->seq = 0;
1112
1113     /* request options supported by the server; this also detects server type */
1114     for (rt->server_type = RTSP_SERVER_RTP;;) {
1115         snprintf(cmd, sizeof(cmd),
1116                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1117         if (rt->server_type == RTSP_SERVER_REAL)
1118             av_strlcat(cmd,
1119                        /**
1120                         * The following entries are required for proper
1121                         * streaming from a Realmedia server. They are
1122                         * interdependent in some way although we currently
1123                         * don't quite understand how. Values were copied
1124                         * from mplayer SVN r23589.
1125                         * @param CompanyID is a 16-byte ID in base64
1126                         * @param ClientChallenge is a 16-byte ID in hex
1127                         */
1128                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1129                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1130                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1131                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1132                        sizeof(cmd));
1133         rtsp_send_cmd(s, cmd, reply, NULL);
1134         if (reply->status_code != RTSP_STATUS_OK) {
1135             err = AVERROR_INVALIDDATA;
1136             goto fail;
1137         }
1138
1139         /* detect server type if not standard-compliant RTP */
1140         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1141             rt->server_type = RTSP_SERVER_REAL;
1142             continue;
1143         } else if (rt->server_type == RTSP_SERVER_REAL) {
1144             strcpy(real_challenge, reply->real_challenge);
1145         }
1146         break;
1147     }
1148
1149     /* describe the stream */
1150     snprintf(cmd, sizeof(cmd),
1151              "DESCRIBE %s RTSP/1.0\r\n"
1152              "Accept: application/sdp\r\n",
1153              s->filename);
1154     if (rt->server_type == RTSP_SERVER_REAL) {
1155         /**
1156          * The Require: attribute is needed for proper streaming from
1157          * Realmedia servers.
1158          */
1159         av_strlcat(cmd,
1160                    "Require: com.real.retain-entity-for-setup\r\n",
1161                    sizeof(cmd));
1162     }
1163     rtsp_send_cmd(s, cmd, reply, &content);
1164     if (!content) {
1165         err = AVERROR_INVALIDDATA;
1166         goto fail;
1167     }
1168     if (reply->status_code != RTSP_STATUS_OK) {
1169         err = AVERROR_INVALIDDATA;
1170         goto fail;
1171     }
1172
1173     /* now we got the SDP description, we parse it */
1174     ret = sdp_parse(s, (const char *)content);
1175     av_freep(&content);
1176     if (ret < 0) {
1177         err = AVERROR_INVALIDDATA;
1178         goto fail;
1179     }
1180
1181     do {
1182         int protocol = ff_log2_tab[protocol_mask & ~(protocol_mask - 1)];
1183
1184         err = make_setup_request(s, host, port, protocol,
1185                                  rt->server_type == RTSP_SERVER_REAL ?
1186                                      real_challenge : NULL);
1187         if (err < 0)
1188             goto fail;
1189         protocol_mask &= ~(1 << protocol);
1190         if (protocol_mask == 0 && err == 1) {
1191             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1192             goto fail;
1193         }
1194     } while (err);
1195
1196     rt->state = RTSP_STATE_IDLE;
1197     rt->seek_timestamp = 0; /* default is to start stream at position
1198                                zero */
1199     if (ap->initial_pause) {
1200         /* do not start immediately */
1201     } else {
1202         if (rtsp_read_play(s) < 0) {
1203             err = AVERROR_INVALIDDATA;
1204             goto fail;
1205         }
1206     }
1207     return 0;
1208  fail:
1209     rtsp_close_streams(rt);
1210     av_freep(&content);
1211     url_close(rt->rtsp_hd);
1212     return err;
1213 }
1214
1215 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1216                            uint8_t *buf, int buf_size)
1217 {
1218     RTSPState *rt = s->priv_data;
1219     int id, len, i, ret;
1220     RTSPStream *rtsp_st;
1221
1222 #ifdef DEBUG_RTP_TCP
1223     printf("tcp_read_packet:\n");
1224 #endif
1225  redo:
1226     for(;;) {
1227         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1228 #ifdef DEBUG_RTP_TCP
1229         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1230 #endif
1231         if (ret != 1)
1232             return -1;
1233         if (buf[0] == '$')
1234             break;
1235     }
1236     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1237     if (ret != 3)
1238         return -1;
1239     id = buf[0];
1240     len = AV_RB16(buf + 1);
1241 #ifdef DEBUG_RTP_TCP
1242     printf("id=%d len=%d\n", id, len);
1243 #endif
1244     if (len > buf_size || len < 12)
1245         goto redo;
1246     /* get the data */
1247     ret = url_readbuf(rt->rtsp_hd, buf, len);
1248     if (ret != len)
1249         return -1;
1250
1251     /* find the matching stream */
1252     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1253         rtsp_st = rt->rtsp_streams[i];
1254         if (id >= rtsp_st->interleaved_min &&
1255             id <= rtsp_st->interleaved_max)
1256             goto found;
1257     }
1258     goto redo;
1259  found:
1260     *prtsp_st = rtsp_st;
1261     return len;
1262 }
1263
1264 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1265                            uint8_t *buf, int buf_size)
1266 {
1267     RTSPState *rt = s->priv_data;
1268     RTSPStream *rtsp_st;
1269     fd_set rfds;
1270     int fd1, fd2, fd_max, n, i, ret;
1271     struct timeval tv;
1272
1273     for(;;) {
1274         if (url_interrupt_cb())
1275             return AVERROR(EINTR);
1276         FD_ZERO(&rfds);
1277         fd_max = -1;
1278         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1279             rtsp_st = rt->rtsp_streams[i];
1280             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1281             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1282             if (fd1 > fd_max)
1283                 fd_max = fd1;
1284             FD_SET(fd1, &rfds);
1285         }
1286         tv.tv_sec = 0;
1287         tv.tv_usec = 100 * 1000;
1288         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1289         if (n > 0) {
1290             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1291                 rtsp_st = rt->rtsp_streams[i];
1292                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1293                 if (FD_ISSET(fd1, &rfds)) {
1294                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1295                     if (ret > 0) {
1296                         *prtsp_st = rtsp_st;
1297                         return ret;
1298                     }
1299                 }
1300             }
1301         }
1302     }
1303 }
1304
1305 static int rtsp_read_packet(AVFormatContext *s,
1306                             AVPacket *pkt)
1307 {
1308     RTSPState *rt = s->priv_data;
1309     RTSPStream *rtsp_st;
1310     int ret, len;
1311     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1312
1313     if (rt->server_type == RTSP_SERVER_REAL && rt->need_subscription) {
1314         int i;
1315         RTSPHeader reply1, *reply = &reply1;
1316         char cmd[1024];
1317
1318         snprintf(cmd, sizeof(cmd),
1319                  "SET_PARAMETER %s RTSP/1.0\r\n"
1320                  "Subscribe: ",
1321                  s->filename);
1322         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1323             if (i != 0) av_strlcat(cmd, ",", sizeof(cmd));
1324             ff_rdt_subscribe_rule(
1325                 rt->rtsp_streams[i]->rtp_ctx,
1326                 cmd, sizeof(cmd), i, 0);
1327         }
1328         av_strlcat(cmd, "\r\n", sizeof(cmd));
1329         rtsp_send_cmd(s, cmd, reply, NULL);
1330         if (reply->status_code != RTSP_STATUS_OK)
1331             return AVERROR_INVALIDDATA;
1332         rt->need_subscription = 0;
1333
1334         if (rt->state == RTSP_STATE_PLAYING)
1335             rtsp_read_play (s);
1336     }
1337
1338     /* get next frames from the same RTP packet */
1339     if (rt->cur_rtp) {
1340         if (rt->server_type == RTSP_SERVER_REAL)
1341             ret = ff_rdt_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1342         else
1343             ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1344         if (ret == 0) {
1345             rt->cur_rtp = NULL;
1346             return 0;
1347         } else if (ret == 1) {
1348             return 0;
1349         } else {
1350             rt->cur_rtp = NULL;
1351         }
1352     }
1353
1354     /* read next RTP packet */
1355  redo:
1356     switch(rt->protocol) {
1357     default:
1358     case RTSP_PROTOCOL_RTP_TCP:
1359         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1360         break;
1361     case RTSP_PROTOCOL_RTP_UDP:
1362     case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1363         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1364         if (len >=0 && rtsp_st->rtp_ctx)
1365             rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1366         break;
1367     }
1368     if (len < 0)
1369         return len;
1370     if (rt->server_type == RTSP_SERVER_REAL)
1371         ret = ff_rdt_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1372     else
1373         ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1374     if (ret < 0)
1375         goto redo;
1376     if (ret == 1) {
1377         /* more packets may follow, so we save the RTP context */
1378         rt->cur_rtp = rtsp_st->rtp_ctx;
1379     }
1380     return 0;
1381 }
1382
1383 static int rtsp_read_play(AVFormatContext *s)
1384 {
1385     RTSPState *rt = s->priv_data;
1386     RTSPHeader reply1, *reply = &reply1;
1387     char cmd[1024];
1388
1389     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1390
1391     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1392         if (rt->state == RTSP_STATE_PAUSED) {
1393             snprintf(cmd, sizeof(cmd),
1394                      "PLAY %s RTSP/1.0\r\n",
1395                      s->filename);
1396         } else {
1397             snprintf(cmd, sizeof(cmd),
1398                      "PLAY %s RTSP/1.0\r\n"
1399                      "Range: npt=%0.3f-\r\n",
1400                      s->filename,
1401                      (double)rt->seek_timestamp / AV_TIME_BASE);
1402         }
1403         rtsp_send_cmd(s, cmd, reply, NULL);
1404         if (reply->status_code != RTSP_STATUS_OK) {
1405             return -1;
1406         }
1407     }
1408     rt->state = RTSP_STATE_PLAYING;
1409     return 0;
1410 }
1411
1412 /* pause the stream */
1413 static int rtsp_read_pause(AVFormatContext *s)
1414 {
1415     RTSPState *rt = s->priv_data;
1416     RTSPHeader reply1, *reply = &reply1;
1417     char cmd[1024];
1418
1419     rt = s->priv_data;
1420
1421     if (rt->state != RTSP_STATE_PLAYING)
1422         return 0;
1423     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1424         snprintf(cmd, sizeof(cmd),
1425                  "PAUSE %s RTSP/1.0\r\n",
1426                  s->filename);
1427         rtsp_send_cmd(s, cmd, reply, NULL);
1428         if (reply->status_code != RTSP_STATUS_OK) {
1429             return -1;
1430         }
1431     }
1432     rt->state = RTSP_STATE_PAUSED;
1433     return 0;
1434 }
1435
1436 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1437                           int64_t timestamp, int flags)
1438 {
1439     RTSPState *rt = s->priv_data;
1440
1441     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1442     switch(rt->state) {
1443     default:
1444     case RTSP_STATE_IDLE:
1445         break;
1446     case RTSP_STATE_PLAYING:
1447         if (rtsp_read_play(s) != 0)
1448             return -1;
1449         break;
1450     case RTSP_STATE_PAUSED:
1451         rt->state = RTSP_STATE_IDLE;
1452         break;
1453     }
1454     return 0;
1455 }
1456
1457 static int rtsp_read_close(AVFormatContext *s)
1458 {
1459     RTSPState *rt = s->priv_data;
1460     RTSPHeader reply1, *reply = &reply1;
1461     char cmd[1024];
1462
1463 #if 0
1464     /* NOTE: it is valid to flush the buffer here */
1465     if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1466         url_fclose(&rt->rtsp_gb);
1467     }
1468 #endif
1469     snprintf(cmd, sizeof(cmd),
1470              "TEARDOWN %s RTSP/1.0\r\n",
1471              s->filename);
1472     rtsp_send_cmd(s, cmd, reply, NULL);
1473
1474     rtsp_close_streams(rt);
1475     url_close(rt->rtsp_hd);
1476     return 0;
1477 }
1478
1479 #ifdef CONFIG_RTSP_DEMUXER
1480 AVInputFormat rtsp_demuxer = {
1481     "rtsp",
1482     NULL_IF_CONFIG_SMALL("RTSP input format"),
1483     sizeof(RTSPState),
1484     rtsp_probe,
1485     rtsp_read_header,
1486     rtsp_read_packet,
1487     rtsp_read_close,
1488     rtsp_read_seek,
1489     .flags = AVFMT_NOFILE,
1490     .read_play = rtsp_read_play,
1491     .read_pause = rtsp_read_pause,
1492 };
1493 #endif
1494
1495 static int sdp_probe(AVProbeData *p1)
1496 {
1497     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1498
1499     /* we look for a line beginning "c=IN IP4" */
1500     while (p < p_end && *p != '\0') {
1501         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1502             return AVPROBE_SCORE_MAX / 2;
1503
1504         while(p < p_end - 1 && *p != '\n') p++;
1505         if (++p >= p_end)
1506             break;
1507         if (*p == '\r')
1508             p++;
1509     }
1510     return 0;
1511 }
1512
1513 #define SDP_MAX_SIZE 8192
1514
1515 static int sdp_read_header(AVFormatContext *s,
1516                            AVFormatParameters *ap)
1517 {
1518     RTSPState *rt = s->priv_data;
1519     RTSPStream *rtsp_st;
1520     int size, i, err;
1521     char *content;
1522     char url[1024];
1523
1524     /* read the whole sdp file */
1525     /* XXX: better loading */
1526     content = av_malloc(SDP_MAX_SIZE);
1527     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1528     if (size <= 0) {
1529         av_free(content);
1530         return AVERROR_INVALIDDATA;
1531     }
1532     content[size] ='\0';
1533
1534     sdp_parse(s, content);
1535     av_free(content);
1536
1537     /* open each RTP stream */
1538     for(i=0;i<rt->nb_rtsp_streams;i++) {
1539         rtsp_st = rt->rtsp_streams[i];
1540
1541         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1542                  inet_ntoa(rtsp_st->sdp_ip),
1543                  rtsp_st->sdp_port,
1544                  rtsp_st->sdp_port,
1545                  rtsp_st->sdp_ttl);
1546         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1547             err = AVERROR_INVALIDDATA;
1548             goto fail;
1549         }
1550         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1551             goto fail;
1552     }
1553     return 0;
1554  fail:
1555     rtsp_close_streams(rt);
1556     return err;
1557 }
1558
1559 static int sdp_read_packet(AVFormatContext *s,
1560                             AVPacket *pkt)
1561 {
1562     return rtsp_read_packet(s, pkt);
1563 }
1564
1565 static int sdp_read_close(AVFormatContext *s)
1566 {
1567     RTSPState *rt = s->priv_data;
1568     rtsp_close_streams(rt);
1569     return 0;
1570 }
1571
1572 #ifdef CONFIG_SDP_DEMUXER
1573 AVInputFormat sdp_demuxer = {
1574     "sdp",
1575     NULL_IF_CONFIG_SMALL("SDP"),
1576     sizeof(RTSPState),
1577     sdp_probe,
1578     sdp_read_header,
1579     sdp_read_packet,
1580     sdp_read_close,
1581 };
1582 #endif
1583
1584 #ifdef CONFIG_REDIR_DEMUXER
1585 /* dummy redirector format (used directly in av_open_input_file now) */
1586 static int redir_probe(AVProbeData *pd)
1587 {
1588     const char *p;
1589     p = pd->buf;
1590     while (redir_isspace(*p))
1591         p++;
1592     if (av_strstart(p, "http://", NULL) ||
1593         av_strstart(p, "rtsp://", NULL))
1594         return AVPROBE_SCORE_MAX;
1595     return 0;
1596 }
1597
1598 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1599 {
1600     char buf[4096], *q;
1601     int c;
1602     AVFormatContext *ic = NULL;
1603     ByteIOContext *f = s->pb;
1604
1605     /* parse each URL and try to open it */
1606     c = url_fgetc(f);
1607     while (c != URL_EOF) {
1608         /* skip spaces */
1609         for(;;) {
1610             if (!redir_isspace(c))
1611                 break;
1612             c = url_fgetc(f);
1613         }
1614         if (c == URL_EOF)
1615             break;
1616         /* record url */
1617         q = buf;
1618         for(;;) {
1619             if (c == URL_EOF || redir_isspace(c))
1620                 break;
1621             if ((q - buf) < sizeof(buf) - 1)
1622                 *q++ = c;
1623             c = url_fgetc(f);
1624         }
1625         *q = '\0';
1626         //printf("URL='%s'\n", buf);
1627         /* try to open the media file */
1628         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1629             break;
1630     }
1631     if (!ic)
1632         return AVERROR(EIO);
1633
1634     *s = *ic;
1635     url_fclose(f);
1636
1637     return 0;
1638 }
1639
1640 AVInputFormat redir_demuxer = {
1641     "redir",
1642     NULL_IF_CONFIG_SMALL("Redirector format"),
1643     0,
1644     redir_probe,
1645     redir_read_header,
1646     NULL,
1647     NULL,
1648 };
1649 #endif