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 enum RTSPTransport {
  55     RTSP_TRANSPORT_RTP,
  56     RTSP_TRANSPORT_RDT,
  57     RTSP_TRANSPORT_LAST
  58 };
  59
  60 typedef struct RTSPState {
  61     URLContext *rtsp_hd; /* RTSP TCP connexion handle */
  62     int nb_rtsp_streams;
  63     struct RTSPStream **rtsp_streams;
  64
  65     enum RTSPClientState state;
  66     int64_t seek_timestamp;
  67
  68     /* XXX: currently we use unbuffered input */
  69     //    ByteIOContext rtsp_gb;
  70     int seq;        /* RTSP command sequence number */
  71     char session_id[512];
  72     enum RTSPTransport transport;
  73     enum RTSPLowerTransport lower_transport;
  74     enum RTSPServerType server_type;
  75     char last_reply[2048]; /* XXX: allocate ? */
  76     RTPDemuxContext *cur_rtp;
  77     int need_subscription;
  78 } RTSPState;
  79
  80 typedef struct RTSPStream {
  81     URLContext *rtp_handle; /* RTP stream handle */
  82     RTPDemuxContext *rtp_ctx; /* RTP parse context */
  83
  84     int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
  85     int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
  86     char control_url[1024]; /* url for this stream (from SDP) */
  87
  88     int sdp_port; /* port (from SDP content - not used in RTSP) */
  89     struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
  90     int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
  91     int sdp_payload_type; /* payload type - only used in SDP */
  92     rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
  93
  94     RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
  95     void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
  96 } RTSPStream;
  97
  98 static int rtsp_read_play(AVFormatContext *s);
  99
 100 /* XXX: currently, the only way to change the protocols consists in
 101    changing this variable */
 102
 103 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
 104 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
 105 #endif
 106
 107 static int rtsp_probe(AVProbeData *p)
 108 {
 109     if (av_strstart(p->filename, "rtsp:", NULL))
 110         return AVPROBE_SCORE_MAX;
 111     return 0;
 112 }
 113
 114 static int redir_isspace(int c)
 115 {
 116     return c == ' ' || c == '\t' || c == '\n' || c == '\r';
 117 }
 118
 119 static void skip_spaces(const char **pp)
 120 {
 121     const char *p;
 122     p = *pp;
 123     while (redir_isspace(*p))
 124         p++;
 125     *pp = p;
 126 }
 127
 128 static void get_word_sep(char *buf, int buf_size, const char *sep,
 129                          const char **pp)
 130 {
 131     const char *p;
 132     char *q;
 133
 134     p = *pp;
 135     if (*p == '/')
 136         p++;
 137     skip_spaces(&p);
 138     q = buf;
 139     while (!strchr(sep, *p) && *p != '\0') {
 140         if ((q - buf) < buf_size - 1)
 141             *q++ = *p;
 142         p++;
 143     }
 144     if (buf_size > 0)
 145         *q = '\0';
 146     *pp = p;
 147 }
 148
 149 static void get_word(char *buf, int buf_size, const char **pp)
 150 {
 151     const char *p;
 152     char *q;
 153
 154     p = *pp;
 155     skip_spaces(&p);
 156     q = buf;
 157     while (!redir_isspace(*p) && *p != '\0') {
 158         if ((q - buf) < buf_size - 1)
 159             *q++ = *p;
 160         p++;
 161     }
 162     if (buf_size > 0)
 163         *q = '\0';
 164     *pp = p;
 165 }
 166
 167 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 168    params>] */
 169 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 170 {
 171     char buf[256];
 172     int i;
 173     AVCodec *c;
 174     const char *c_name;
 175
 176     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 177        see if we can handle this kind of payload */
 178     get_word_sep(buf, sizeof(buf), "/", &p);
 179     if (payload_type >= RTP_PT_PRIVATE) {
 180         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 181         while(handler) {
 182             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 183                 codec->codec_id = handler->codec_id;
 184                 rtsp_st->dynamic_handler= handler;
 185                 if(handler->open) {
 186                     rtsp_st->dynamic_protocol_context= handler->open();
 187                 }
 188                 break;
 189             }
 190             handler= handler->next;
 191         }
 192     } else {
 193         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 194         /* search into AVRtpPayloadTypes[] */
 195         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 196     }
 197
 198     c = avcodec_find_decoder(codec->codec_id);
 199     if (c && c->name)
 200         c_name = c->name;
 201     else
 202         c_name = (char *)NULL;
 203
 204     if (c_name) {
 205         get_word_sep(buf, sizeof(buf), "/", &p);
 206         i = atoi(buf);
 207         switch (codec->codec_type) {
 208             case CODEC_TYPE_AUDIO:
 209                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 210                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 211                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 212                 if (i > 0) {
 213                     codec->sample_rate = i;
 214                     get_word_sep(buf, sizeof(buf), "/", &p);
 215                     i = atoi(buf);
 216                     if (i > 0)
 217                         codec->channels = i;
 218                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 219                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 220                 }
 221                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 222                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 223                 break;
 224             case CODEC_TYPE_VIDEO:
 225                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 226                 break;
 227             default:
 228                 break;
 229         }
 230         return 0;
 231     }
 232
 233     return -1;
 234 }
 235
 236 /* return the length and optionnaly the data */
 237 static int hex_to_data(uint8_t *data, const char *p)
 238 {
 239     int c, len, v;
 240
 241     len = 0;
 242     v = 1;
 243     for(;;) {
 244         skip_spaces(&p);
 245         if (p == '\0')
 246             break;
 247         c = toupper((unsigned char)*p++);
 248         if (c >= '0' && c <= '9')
 249             c = c - '0';
 250         else if (c >= 'A' && c <= 'F')
 251             c = c - 'A' + 10;
 252         else
 253             break;
 254         v = (v << 4) | c;
 255         if (v & 0x100) {
 256             if (data)
 257                 data[len] = v;
 258             len++;
 259             v = 1;
 260         }
 261     }
 262     return len;
 263 }
 264
 265 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 266 {
 267     switch (codec->codec_id) {
 268         case CODEC_ID_MPEG4:
 269         case CODEC_ID_AAC:
 270             if (!strcmp(attr, "config")) {
 271                 /* decode the hexa encoded parameter */
 272                 int len = hex_to_data(NULL, value);
 273                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 274                 if (!codec->extradata)
 275                     return;
 276                 codec->extradata_size = len;
 277                 hex_to_data(codec->extradata, value);
 278             }
 279             break;
 280         default:
 281             break;
 282     }
 283     return;
 284 }
 285
 286 typedef struct attrname_map
 287 {
 288     const char *str;
 289     uint16_t type;
 290     uint32_t offset;
 291 } attrname_map_t;
 292
 293 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 294 #define ATTR_NAME_TYPE_INT 0
 295 #define ATTR_NAME_TYPE_STR 1
 296 static attrname_map_t attr_names[]=
 297 {
 298     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
 299     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
 300     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
 301     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
 302     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
 303     {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
 304     {NULL, -1, -1},
 305 };
 306
 307 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 308 * because it is used in rtp_h264.c, which is forthcoming.
 309 */
 310 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 311 {
 312     skip_spaces(p);
 313     if(**p)
 314     {
 315         get_word_sep(attr, attr_size, "=", p);
 316         if (**p == '=')
 317             (*p)++;
 318         get_word_sep(value, value_size, ";", p);
 319         if (**p == ';')
 320             (*p)++;
 321         return 1;
 322     }
 323     return 0;
 324 }
 325
 326 /* parse a SDP line and save stream attributes */
 327 static void sdp_parse_fmtp(AVStream *st, const char *p)
 328 {
 329     char attr[256];
 330     char value[4096];
 331     int i;
 332
 333     RTSPStream *rtsp_st = st->priv_data;
 334     AVCodecContext *codec = st->codec;
 335     rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
 336
 337     /* loop on each attribute */
 338     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 339     {
 340         /* grab the codec extra_data from the config parameter of the fmtp line */
 341         sdp_parse_fmtp_config(codec, attr, value);
 342         /* Looking for a known attribute */
 343         for (i = 0; attr_names[i].str; ++i) {
 344             if (!strcasecmp(attr, attr_names[i].str)) {
 345                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 346                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 347                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 348                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 349             }
 350         }
 351     }
 352 }
 353
 354 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 355  *  and end time.
 356  *  Used for seeking in the rtp stream.
 357  */
 358 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 359 {
 360     char buf[256];
 361
 362     skip_spaces(&p);
 363     if (!av_stristart(p, "npt=", &p))
 364         return;
 365
 366     *start = AV_NOPTS_VALUE;
 367     *end = AV_NOPTS_VALUE;
 368
 369     get_word_sep(buf, sizeof(buf), "-", &p);
 370     *start = parse_date(buf, 1);
 371     if (*p == '-') {
 372         p++;
 373         get_word_sep(buf, sizeof(buf), "-", &p);
 374         *end = parse_date(buf, 1);
 375     }
 376 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 377 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 378 }
 379
 380 typedef struct SDPParseState {
 381     /* SDP only */
 382     struct in_addr default_ip;
 383     int default_ttl;
 384 } SDPParseState;
 385
 386 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 387                            int letter, const char *buf)
 388 {
 389     RTSPState *rt = s->priv_data;
 390     char buf1[64], st_type[64];
 391     const char *p;
 392     int codec_type, payload_type, i;
 393     AVStream *st;
 394     RTSPStream *rtsp_st;
 395     struct in_addr sdp_ip;
 396     int ttl;
 397
 398 #ifdef DEBUG
 399     printf("sdp: %c='%s'\n", letter, buf);
 400 #endif
 401
 402     p = buf;
 403     switch(letter) {
 404     case 'c':
 405         get_word(buf1, sizeof(buf1), &p);
 406         if (strcmp(buf1, "IN") != 0)
 407             return;
 408         get_word(buf1, sizeof(buf1), &p);
 409         if (strcmp(buf1, "IP4") != 0)
 410             return;
 411         get_word_sep(buf1, sizeof(buf1), "/", &p);
 412         if (inet_aton(buf1, &sdp_ip) == 0)
 413             return;
 414         ttl = 16;
 415         if (*p == '/') {
 416             p++;
 417             get_word_sep(buf1, sizeof(buf1), "/", &p);
 418             ttl = atoi(buf1);
 419         }
 420         if (s->nb_streams == 0) {
 421             s1->default_ip = sdp_ip;
 422             s1->default_ttl = ttl;
 423         } else {
 424             st = s->streams[s->nb_streams - 1];
 425             rtsp_st = st->priv_data;
 426             rtsp_st->sdp_ip = sdp_ip;
 427             rtsp_st->sdp_ttl = ttl;
 428         }
 429         break;
 430     case 's':
 431         av_strlcpy(s->title, p, sizeof(s->title));
 432         break;
 433     case 'i':
 434         if (s->nb_streams == 0) {
 435             av_strlcpy(s->comment, p, sizeof(s->comment));
 436             break;
 437         }
 438         break;
 439     case 'm':
 440         /* new stream */
 441         get_word(st_type, sizeof(st_type), &p);
 442         if (!strcmp(st_type, "audio")) {
 443             codec_type = CODEC_TYPE_AUDIO;
 444         } else if (!strcmp(st_type, "video")) {
 445             codec_type = CODEC_TYPE_VIDEO;
 446         } else {
 447             return;
 448         }
 449         rtsp_st = av_mallocz(sizeof(RTSPStream));
 450         if (!rtsp_st)
 451             return;
 452         rtsp_st->stream_index = -1;
 453         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 454
 455         rtsp_st->sdp_ip = s1->default_ip;
 456         rtsp_st->sdp_ttl = s1->default_ttl;
 457
 458         get_word(buf1, sizeof(buf1), &p); /* port */
 459         rtsp_st->sdp_port = atoi(buf1);
 460
 461         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 462
 463         /* XXX: handle list of formats */
 464         get_word(buf1, sizeof(buf1), &p); /* format list */
 465         rtsp_st->sdp_payload_type = atoi(buf1);
 466
 467         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 468             /* no corresponding stream */
 469         } else {
 470             st = av_new_stream(s, 0);
 471             if (!st)
 472                 return;
 473             st->priv_data = rtsp_st;
 474             rtsp_st->stream_index = st->index;
 475             st->codec->codec_type = codec_type;
 476             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 477                 /* if standard payload type, we can find the codec right now */
 478                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 479             }
 480         }
 481         /* put a default control url */
 482         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 483         break;
 484     case 'a':
 485         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 486             char proto[32];
 487             /* get the control url */
 488             st = s->streams[s->nb_streams - 1];
 489             rtsp_st = st->priv_data;
 490
 491             /* XXX: may need to add full url resolution */
 492             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 493             if (proto[0] == '\0') {
 494                 /* relative control URL */
 495                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 496                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 497             } else {
 498                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 499             }
 500         } else if (av_strstart(p, "rtpmap:", &p)) {
 501             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 502             get_word(buf1, sizeof(buf1), &p);
 503             payload_type = atoi(buf1);
 504             for(i = 0; i < s->nb_streams;i++) {
 505                 st = s->streams[i];
 506                 rtsp_st = st->priv_data;
 507                 if (rtsp_st->sdp_payload_type == payload_type) {
 508                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 509                 }
 510             }
 511         } else if (av_strstart(p, "fmtp:", &p)) {
 512             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 513             get_word(buf1, sizeof(buf1), &p);
 514             payload_type = atoi(buf1);
 515             for(i = 0; i < s->nb_streams;i++) {
 516                 st = s->streams[i];
 517                 rtsp_st = st->priv_data;
 518                 if (rtsp_st->sdp_payload_type == payload_type) {
 519                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 520                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 521                             sdp_parse_fmtp(st, p);
 522                         }
 523                     } else {
 524                         sdp_parse_fmtp(st, p);
 525                     }
 526                 }
 527             }
 528         } else if(av_strstart(p, "framesize:", &p)) {
 529             // let dynamic protocol handlers have a stab at the line.
 530             get_word(buf1, sizeof(buf1), &p);
 531             payload_type = atoi(buf1);
 532             for(i = 0; i < s->nb_streams;i++) {
 533                 st = s->streams[i];
 534                 rtsp_st = st->priv_data;
 535                 if (rtsp_st->sdp_payload_type == payload_type) {
 536                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 537                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 538                     }
 539                 }
 540             }
 541         } else if(av_strstart(p, "range:", &p)) {
 542             int64_t start, end;
 543
 544             // this is so that seeking on a streamed file can work.
 545             rtsp_parse_range_npt(p, &start, &end);
 546             s->start_time= start;
 547             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 548         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 549             if (atoi(p) == 1)
 550                 rt->transport = RTSP_TRANSPORT_RDT;
 551         } else if (s->nb_streams > 0) {
 552             rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 553             if (rtsp_st->dynamic_handler &&
 554                 rtsp_st->dynamic_handler->parse_sdp_a_line)
 555                 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
 556                     rtsp_st->dynamic_protocol_context, buf);
 557         }
 558         break;
 559     }
 560 }
 561
 562 static int sdp_parse(AVFormatContext *s, const char *content)
 563 {
 564     const char *p;
 565     int letter;
 566     char buf[2048], *q;
 567     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 568
 569     memset(s1, 0, sizeof(SDPParseState));
 570     p = content;
 571     for(;;) {
 572         skip_spaces(&p);
 573         letter = *p;
 574         if (letter == '\0')
 575             break;
 576         p++;
 577         if (*p != '=')
 578             goto next_line;
 579         p++;
 580         /* get the content */
 581         q = buf;
 582         while (*p != '\n' && *p != '\r' && *p != '\0') {
 583             if ((q - buf) < sizeof(buf) - 1)
 584                 *q++ = *p;
 585             p++;
 586         }
 587         *q = '\0';
 588         sdp_parse_line(s, s1, letter, buf);
 589     next_line:
 590         while (*p != '\n' && *p != '\0')
 591             p++;
 592         if (*p == '\n')
 593             p++;
 594     }
 595     return 0;
 596 }
 597
 598 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 599 {
 600     const char *p;
 601     int v;
 602
 603     p = *pp;
 604     skip_spaces(&p);
 605     v = strtol(p, (char **)&p, 10);
 606     if (*p == '-') {
 607         p++;
 608         *min_ptr = v;
 609         v = strtol(p, (char **)&p, 10);
 610         *max_ptr = v;
 611     } else {
 612         *min_ptr = v;
 613         *max_ptr = v;
 614     }
 615     *pp = p;
 616 }
 617
 618 /* XXX: only one transport specification is parsed */
 619 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 620 {
 621     char transport_protocol[16];
 622     char profile[16];
 623     char lower_transport[16];
 624     char parameter[16];
 625     RTSPTransportField *th;
 626     char buf[256];
 627
 628     reply->nb_transports = 0;
 629
 630     for(;;) {
 631         skip_spaces(&p);
 632         if (*p == '\0')
 633             break;
 634
 635         th = &reply->transports[reply->nb_transports];
 636
 637         get_word_sep(transport_protocol, sizeof(transport_protocol),
 638                      "/", &p);
 639         if (*p == '/')
 640             p++;
 641         if (!strcasecmp (transport_protocol, "rtp")) {
 642             get_word_sep(profile, sizeof(profile), "/;,", &p);
 643             lower_transport[0] = '\0';
 644             /* rtp/avp/<protocol> */
 645             if (*p == '/') {
 646                 p++;
 647                 get_word_sep(lower_transport, sizeof(lower_transport),
 648                              ";,", &p);
 649             }
 650             th->transport = RTSP_TRANSPORT_RTP;
 651         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 652                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 653             /* x-pn-tng/<protocol> */
 654             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 655             profile[0] = '\0';
 656             th->transport = RTSP_TRANSPORT_RDT;
 657         }
 658         if (!strcasecmp(lower_transport, "TCP"))
 659             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 660         else
 661             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 662
 663         if (*p == ';')
 664             p++;
 665         /* get each parameter */
 666         while (*p != '\0' && *p != ',') {
 667             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 668             if (!strcmp(parameter, "port")) {
 669                 if (*p == '=') {
 670                     p++;
 671                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 672                 }
 673             } else if (!strcmp(parameter, "client_port")) {
 674                 if (*p == '=') {
 675                     p++;
 676                     rtsp_parse_range(&th->client_port_min,
 677                                      &th->client_port_max, &p);
 678                 }
 679             } else if (!strcmp(parameter, "server_port")) {
 680                 if (*p == '=') {
 681                     p++;
 682                     rtsp_parse_range(&th->server_port_min,
 683                                      &th->server_port_max, &p);
 684                 }
 685             } else if (!strcmp(parameter, "interleaved")) {
 686                 if (*p == '=') {
 687                     p++;
 688                     rtsp_parse_range(&th->interleaved_min,
 689                                      &th->interleaved_max, &p);
 690                 }
 691             } else if (!strcmp(parameter, "multicast")) {
 692                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 693                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 694             } else if (!strcmp(parameter, "ttl")) {
 695                 if (*p == '=') {
 696                     p++;
 697                     th->ttl = strtol(p, (char **)&p, 10);
 698                 }
 699             } else if (!strcmp(parameter, "destination")) {
 700                 struct in_addr ipaddr;
 701
 702                 if (*p == '=') {
 703                     p++;
 704                     get_word_sep(buf, sizeof(buf), ";,", &p);
 705                     if (inet_aton(buf, &ipaddr))
 706                         th->destination = ntohl(ipaddr.s_addr);
 707                 }
 708             }
 709             while (*p != ';' && *p != '\0' && *p != ',')
 710                 p++;
 711             if (*p == ';')
 712                 p++;
 713         }
 714         if (*p == ',')
 715             p++;
 716
 717         reply->nb_transports++;
 718     }
 719 }
 720
 721 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 722 {
 723     const char *p;
 724
 725     /* NOTE: we do case independent match for broken servers */
 726     p = buf;
 727     if (av_stristart(p, "Session:", &p)) {
 728         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 729     } else if (av_stristart(p, "Content-Length:", &p)) {
 730         reply->content_length = strtol(p, NULL, 10);
 731     } else if (av_stristart(p, "Transport:", &p)) {
 732         rtsp_parse_transport(reply, p);
 733     } else if (av_stristart(p, "CSeq:", &p)) {
 734         reply->seq = strtol(p, NULL, 10);
 735     } else if (av_stristart(p, "Range:", &p)) {
 736         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 737     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 738         skip_spaces(&p);
 739         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 740     }
 741 }
 742
 743 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 744 {
 745     int ret, len;
 746
 747     len = 0;
 748     while (len < size) {
 749         ret = url_read(h, buf+len, size-len);
 750         if (ret < 1)
 751             return ret;
 752         len += ret;
 753     }
 754     return len;
 755 }
 756
 757 /* skip a RTP/TCP interleaved packet */
 758 static void rtsp_skip_packet(AVFormatContext *s)
 759 {
 760     RTSPState *rt = s->priv_data;
 761     int ret, len, len1;
 762     uint8_t buf[1024];
 763
 764     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 765     if (ret != 3)
 766         return;
 767     len = AV_RB16(buf + 1);
 768 #ifdef DEBUG
 769     printf("skipping RTP packet len=%d\n", len);
 770 #endif
 771     /* skip payload */
 772     while (len > 0) {
 773         len1 = len;
 774         if (len1 > sizeof(buf))
 775             len1 = sizeof(buf);
 776         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 777         if (ret != len1)
 778             return;
 779         len -= len1;
 780     }
 781 }
 782
 783 static void rtsp_send_cmd(AVFormatContext *s,
 784                           const char *cmd, RTSPHeader *reply,
 785                           unsigned char **content_ptr)
 786 {
 787     RTSPState *rt = s->priv_data;
 788     char buf[4096], buf1[1024], *q;
 789     unsigned char ch;
 790     const char *p;
 791     int content_length, line_count;
 792     unsigned char *content = NULL;
 793
 794     memset(reply, 0, sizeof(RTSPHeader));
 795
 796     rt->seq++;
 797     av_strlcpy(buf, cmd, sizeof(buf));
 798     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 799     av_strlcat(buf, buf1, sizeof(buf));
 800     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 801         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 802         av_strlcat(buf, buf1, sizeof(buf));
 803     }
 804     av_strlcat(buf, "\r\n", sizeof(buf));
 805 #ifdef DEBUG
 806     printf("Sending:\n%s--\n", buf);
 807 #endif
 808     url_write(rt->rtsp_hd, buf, strlen(buf));
 809
 810     /* parse reply (XXX: use buffers) */
 811     line_count = 0;
 812     rt->last_reply[0] = '\0';
 813     for(;;) {
 814         q = buf;
 815         for(;;) {
 816             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 817                 break;
 818             if (ch == '\n')
 819                 break;
 820             if (ch == '$') {
 821                 /* XXX: only parse it if first char on line ? */
 822                 rtsp_skip_packet(s);
 823             } else if (ch != '\r') {
 824                 if ((q - buf) < sizeof(buf) - 1)
 825                     *q++ = ch;
 826             }
 827         }
 828         *q = '\0';
 829 #ifdef DEBUG
 830         printf("line='%s'\n", buf);
 831 #endif
 832         /* test if last line */
 833         if (buf[0] == '\0')
 834             break;
 835         p = buf;
 836         if (line_count == 0) {
 837             /* get reply code */
 838             get_word(buf1, sizeof(buf1), &p);
 839             get_word(buf1, sizeof(buf1), &p);
 840             reply->status_code = atoi(buf1);
 841         } else {
 842             rtsp_parse_line(reply, p);
 843             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 844             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 845         }
 846         line_count++;
 847     }
 848
 849     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 850         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 851
 852     content_length = reply->content_length;
 853     if (content_length > 0) {
 854         /* leave some room for a trailing '\0' (useful for simple parsing) */
 855         content = av_malloc(content_length + 1);
 856         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 857         content[content_length] = '\0';
 858     }
 859     if (content_ptr)
 860         *content_ptr = content;
 861     else
 862         av_free(content);
 863 }
 864
 865
 866 /* close and free RTSP streams */
 867 static void rtsp_close_streams(RTSPState *rt)
 868 {
 869     int i;
 870     RTSPStream *rtsp_st;
 871
 872     for(i=0;i<rt->nb_rtsp_streams;i++) {
 873         rtsp_st = rt->rtsp_streams[i];
 874         if (rtsp_st) {
 875             if (rtsp_st->rtp_ctx)
 876                 rtp_parse_close(rtsp_st->rtp_ctx);
 877             if (rtsp_st->rtp_handle)
 878                 url_close(rtsp_st->rtp_handle);
 879             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 880                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 881         }
 882     }
 883     av_free(rt->rtsp_streams);
 884 }
 885
 886 static int
 887 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 888 {
 889     AVStream *st = NULL;
 890
 891     /* open the RTP context */
 892     if (rtsp_st->stream_index >= 0)
 893         st = s->streams[rtsp_st->stream_index];
 894     if (!st)
 895         s->ctx_flags |= AVFMTCTX_NOHEADER;
 896     rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
 897
 898     if (!rtsp_st->rtp_ctx) {
 899          return AVERROR(ENOMEM);
 900     } else {
 901         if(rtsp_st->dynamic_handler) {
 902             rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
 903             rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
 904         }
 905     }
 906
 907     return 0;
 908 }
 909
 910 /**
 911  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 912  */
 913 static int
 914 make_setup_request (AVFormatContext *s, const char *host, int port,
 915                     int lower_transport, const char *real_challenge)
 916 {
 917     RTSPState *rt = s->priv_data;
 918     int j, i, err;
 919     RTSPStream *rtsp_st;
 920     RTSPHeader reply1, *reply = &reply1;
 921     char cmd[2048];
 922     const char *trans_pref;
 923
 924     if (rt->transport == RTSP_TRANSPORT_RDT)
 925         trans_pref = "x-pn-tng";
 926     else
 927         trans_pref = "RTP/AVP";
 928
 929     /* for each stream, make the setup request */
 930     /* XXX: we assume the same server is used for the control of each
 931        RTSP stream */
 932
 933     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 934         char transport[2048];
 935
 936         rtsp_st = rt->rtsp_streams[i];
 937
 938         /* RTP/UDP */
 939         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 940             char buf[256];
 941
 942             /* first try in specified port range */
 943             if (RTSP_RTP_PORT_MIN != 0) {
 944                 while(j <= RTSP_RTP_PORT_MAX) {
 945                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 946                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 947                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 948                         goto rtp_opened;
 949                     }
 950                 }
 951             }
 952
 953 /*            then try on any port
 954 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 955 **                err = AVERROR_INVALIDDATA;
 956 **                goto fail;
 957 **            }
 958 */
 959
 960         rtp_opened:
 961             port = rtp_get_local_port(rtsp_st->rtp_handle);
 962             snprintf(transport, sizeof(transport) - 1,
 963                      "%s/UDP;", trans_pref);
 964             if (rt->server_type != RTSP_SERVER_REAL)
 965                 av_strlcat(transport, "unicast;", sizeof(transport));
 966             av_strlcatf(transport, sizeof(transport),
 967                      "client_port=%d", port);
 968             if (rt->transport == RTSP_TRANSPORT_RTP)
 969                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
 970         }
 971
 972         /* RTP/TCP */
 973         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 974             snprintf(transport, sizeof(transport) - 1,
 975                      "%s/TCP", trans_pref);
 976         }
 977
 978         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
 979             snprintf(transport, sizeof(transport) - 1,
 980                      "%s/UDP;multicast", trans_pref);
 981         }
 982         if (rt->server_type == RTSP_SERVER_REAL)
 983             av_strlcat(transport, ";mode=play", sizeof(transport));
 984         snprintf(cmd, sizeof(cmd),
 985                  "SETUP %s RTSP/1.0\r\n"
 986                  "Transport: %s\r\n",
 987                  rtsp_st->control_url, transport);
 988         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
 989             char real_res[41], real_csum[9];
 990             ff_rdt_calc_response_and_checksum(real_res, real_csum,
 991                                               real_challenge);
 992             av_strlcatf(cmd, sizeof(cmd),
 993                         "If-Match: %s\r\n"
 994                         "RealChallenge2: %s, sd=%s\r\n",
 995                         rt->session_id, real_res, real_csum);
 996         }
 997         rtsp_send_cmd(s, cmd, reply, NULL);
 998         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
 999             err = 1;
1000             goto fail;
1001         } else if (reply->status_code != RTSP_STATUS_OK ||
1002                    reply->nb_transports != 1) {
1003             err = AVERROR_INVALIDDATA;
1004             goto fail;
1005         }
1006
1007         /* XXX: same protocol for all streams is required */
1008         if (i > 0) {
1009             if (reply->transports[0].lower_transport != rt->lower_transport ||
1010                 reply->transports[0].transport != rt->transport) {
1011                 err = AVERROR_INVALIDDATA;
1012                 goto fail;
1013             }
1014         } else {
1015             rt->lower_transport = reply->transports[0].lower_transport;
1016             rt->transport = reply->transports[0].transport;
1017         }
1018
1019         /* close RTP connection if not choosen */
1020         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1021             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1022             url_close(rtsp_st->rtp_handle);
1023             rtsp_st->rtp_handle = NULL;
1024         }
1025
1026         switch(reply->transports[0].lower_transport) {
1027         case RTSP_LOWER_TRANSPORT_TCP:
1028             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1029             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1030             break;
1031
1032         case RTSP_LOWER_TRANSPORT_UDP:
1033             {
1034                 char url[1024];
1035
1036                 /* XXX: also use address if specified */
1037                 snprintf(url, sizeof(url), "rtp://%s:%d",
1038                          host, reply->transports[0].server_port_min);
1039                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1040                     err = AVERROR_INVALIDDATA;
1041                     goto fail;
1042                 }
1043             }
1044             break;
1045         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1046             {
1047                 char url[1024];
1048                 struct in_addr in;
1049
1050                 in.s_addr = htonl(reply->transports[0].destination);
1051                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1052                          inet_ntoa(in),
1053                          reply->transports[0].port_min,
1054                          reply->transports[0].ttl);
1055                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1056                     err = AVERROR_INVALIDDATA;
1057                     goto fail;
1058                 }
1059             }
1060             break;
1061         }
1062
1063         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1064             goto fail;
1065     }
1066
1067     if (rt->server_type == RTSP_SERVER_REAL)
1068         rt->need_subscription = 1;
1069
1070     return 0;
1071
1072 fail:
1073     for (i=0; i<rt->nb_rtsp_streams; i++) {
1074         if (rt->rtsp_streams[i]->rtp_handle) {
1075             url_close(rt->rtsp_streams[i]->rtp_handle);
1076             rt->rtsp_streams[i]->rtp_handle = NULL;
1077         }
1078     }
1079     return err;
1080 }
1081
1082 static int rtsp_read_header(AVFormatContext *s,
1083                             AVFormatParameters *ap)
1084 {
1085     RTSPState *rt = s->priv_data;
1086     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1087     URLContext *rtsp_hd;
1088     int port, ret, err;
1089     RTSPHeader reply1, *reply = &reply1;
1090     unsigned char *content = NULL;
1091     int lower_transport_mask = 0;
1092     char real_challenge[64];
1093
1094     /* extract hostname and port */
1095     url_split(NULL, 0, NULL, 0,
1096               host, sizeof(host), &port, path, sizeof(path), s->filename);
1097     if (port < 0)
1098         port = RTSP_DEFAULT_PORT;
1099
1100     /* search for options */
1101     option_list = strchr(path, '?');
1102     if (option_list) {
1103         /* remove the options from the path */
1104         *option_list++ = 0;
1105         while(option_list) {
1106             /* move the option pointer */
1107             option = option_list;
1108             option_list = strchr(option_list, '&');
1109             if (option_list)
1110                 *(option_list++) = 0;
1111             /* handle the options */
1112             if (strcmp(option, "udp") == 0)
1113                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1114             else if (strcmp(option, "multicast") == 0)
1115                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1116             else if (strcmp(option, "tcp") == 0)
1117                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1118         }
1119     }
1120
1121     if (!lower_transport_mask)
1122         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_LAST) - 1;
1123
1124     /* open the tcp connexion */
1125     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1126     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1127         return AVERROR(EIO);
1128     rt->rtsp_hd = rtsp_hd;
1129     rt->seq = 0;
1130
1131     /* request options supported by the server; this also detects server type */
1132     for (rt->server_type = RTSP_SERVER_RTP;;) {
1133         snprintf(cmd, sizeof(cmd),
1134                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1135         if (rt->server_type == RTSP_SERVER_REAL)
1136             av_strlcat(cmd,
1137                        /**
1138                         * The following entries are required for proper
1139                         * streaming from a Realmedia server. They are
1140                         * interdependent in some way although we currently
1141                         * don't quite understand how. Values were copied
1142                         * from mplayer SVN r23589.
1143                         * @param CompanyID is a 16-byte ID in base64
1144                         * @param ClientChallenge is a 16-byte ID in hex
1145                         */
1146                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1147                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1148                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1149                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1150                        sizeof(cmd));
1151         rtsp_send_cmd(s, cmd, reply, NULL);
1152         if (reply->status_code != RTSP_STATUS_OK) {
1153             err = AVERROR_INVALIDDATA;
1154             goto fail;
1155         }
1156
1157         /* detect server type if not standard-compliant RTP */
1158         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1159             rt->server_type = RTSP_SERVER_REAL;
1160             continue;
1161         } else if (rt->server_type == RTSP_SERVER_REAL) {
1162             strcpy(real_challenge, reply->real_challenge);
1163         }
1164         break;
1165     }
1166
1167     /* describe the stream */
1168     snprintf(cmd, sizeof(cmd),
1169              "DESCRIBE %s RTSP/1.0\r\n"
1170              "Accept: application/sdp\r\n",
1171              s->filename);
1172     if (rt->server_type == RTSP_SERVER_REAL) {
1173         /**
1174          * The Require: attribute is needed for proper streaming from
1175          * Realmedia servers.
1176          */
1177         av_strlcat(cmd,
1178                    "Require: com.real.retain-entity-for-setup\r\n",
1179                    sizeof(cmd));
1180     }
1181     rtsp_send_cmd(s, cmd, reply, &content);
1182     if (!content) {
1183         err = AVERROR_INVALIDDATA;
1184         goto fail;
1185     }
1186     if (reply->status_code != RTSP_STATUS_OK) {
1187         err = AVERROR_INVALIDDATA;
1188         goto fail;
1189     }
1190
1191     /* now we got the SDP description, we parse it */
1192     ret = sdp_parse(s, (const char *)content);
1193     av_freep(&content);
1194     if (ret < 0) {
1195         err = AVERROR_INVALIDDATA;
1196         goto fail;
1197     }
1198
1199     do {
1200         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1201
1202         err = make_setup_request(s, host, port, lower_transport,
1203                                  rt->server_type == RTSP_SERVER_REAL ?
1204                                      real_challenge : NULL);
1205         if (err < 0)
1206             goto fail;
1207         lower_transport_mask &= ~(1 << lower_transport);
1208         if (lower_transport_mask == 0 && err == 1) {
1209             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1210             goto fail;
1211         }
1212     } while (err);
1213
1214     rt->state = RTSP_STATE_IDLE;
1215     rt->seek_timestamp = 0; /* default is to start stream at position
1216                                zero */
1217     if (ap->initial_pause) {
1218         /* do not start immediately */
1219     } else {
1220         if (rtsp_read_play(s) < 0) {
1221             err = AVERROR_INVALIDDATA;
1222             goto fail;
1223         }
1224     }
1225     return 0;
1226  fail:
1227     rtsp_close_streams(rt);
1228     av_freep(&content);
1229     url_close(rt->rtsp_hd);
1230     return err;
1231 }
1232
1233 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1234                            uint8_t *buf, int buf_size)
1235 {
1236     RTSPState *rt = s->priv_data;
1237     int id, len, i, ret;
1238     RTSPStream *rtsp_st;
1239
1240 #ifdef DEBUG_RTP_TCP
1241     printf("tcp_read_packet:\n");
1242 #endif
1243  redo:
1244     for(;;) {
1245         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1246 #ifdef DEBUG_RTP_TCP
1247         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1248 #endif
1249         if (ret != 1)
1250             return -1;
1251         if (buf[0] == '$')
1252             break;
1253     }
1254     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1255     if (ret != 3)
1256         return -1;
1257     id = buf[0];
1258     len = AV_RB16(buf + 1);
1259 #ifdef DEBUG_RTP_TCP
1260     printf("id=%d len=%d\n", id, len);
1261 #endif
1262     if (len > buf_size || len < 12)
1263         goto redo;
1264     /* get the data */
1265     ret = url_readbuf(rt->rtsp_hd, buf, len);
1266     if (ret != len)
1267         return -1;
1268
1269     /* find the matching stream */
1270     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1271         rtsp_st = rt->rtsp_streams[i];
1272         if (id >= rtsp_st->interleaved_min &&
1273             id <= rtsp_st->interleaved_max)
1274             goto found;
1275     }
1276     goto redo;
1277  found:
1278     *prtsp_st = rtsp_st;
1279     return len;
1280 }
1281
1282 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1283                            uint8_t *buf, int buf_size)
1284 {
1285     RTSPState *rt = s->priv_data;
1286     RTSPStream *rtsp_st;
1287     fd_set rfds;
1288     int fd1, fd2, fd_max, n, i, ret;
1289     struct timeval tv;
1290
1291     for(;;) {
1292         if (url_interrupt_cb())
1293             return AVERROR(EINTR);
1294         FD_ZERO(&rfds);
1295         fd_max = -1;
1296         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1297             rtsp_st = rt->rtsp_streams[i];
1298             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1299             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1300             if (fd1 > fd_max)
1301                 fd_max = fd1;
1302             FD_SET(fd1, &rfds);
1303         }
1304         tv.tv_sec = 0;
1305         tv.tv_usec = 100 * 1000;
1306         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1307         if (n > 0) {
1308             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1309                 rtsp_st = rt->rtsp_streams[i];
1310                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1311                 if (FD_ISSET(fd1, &rfds)) {
1312                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1313                     if (ret > 0) {
1314                         *prtsp_st = rtsp_st;
1315                         return ret;
1316                     }
1317                 }
1318             }
1319         }
1320     }
1321 }
1322
1323 static int rtsp_read_packet(AVFormatContext *s,
1324                             AVPacket *pkt)
1325 {
1326     RTSPState *rt = s->priv_data;
1327     RTSPStream *rtsp_st;
1328     int ret, len;
1329     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1330
1331     if (rt->server_type == RTSP_SERVER_REAL && rt->need_subscription) {
1332         int i;
1333         RTSPHeader reply1, *reply = &reply1;
1334         char cmd[1024];
1335
1336         snprintf(cmd, sizeof(cmd),
1337                  "SET_PARAMETER %s RTSP/1.0\r\n"
1338                  "Subscribe: ",
1339                  s->filename);
1340         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1341             if (i != 0) av_strlcat(cmd, ",", sizeof(cmd));
1342             ff_rdt_subscribe_rule(cmd, sizeof(cmd), i, 0);
1343             if (rt->transport == RTSP_TRANSPORT_RDT)
1344             ff_rdt_subscribe_rule2(
1345                 rt->rtsp_streams[i]->rtp_ctx,
1346                 cmd, sizeof(cmd), i, 0);
1347         }
1348         av_strlcat(cmd, "\r\n", sizeof(cmd));
1349         rtsp_send_cmd(s, cmd, reply, NULL);
1350         if (reply->status_code != RTSP_STATUS_OK)
1351             return AVERROR_INVALIDDATA;
1352         rt->need_subscription = 0;
1353
1354         if (rt->state == RTSP_STATE_PLAYING)
1355             rtsp_read_play (s);
1356     }
1357
1358     /* get next frames from the same RTP packet */
1359     if (rt->cur_rtp) {
1360         if (rt->transport == RTSP_TRANSPORT_RDT)
1361             ret = ff_rdt_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1362         else
1363             ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1364         if (ret == 0) {
1365             rt->cur_rtp = NULL;
1366             return 0;
1367         } else if (ret == 1) {
1368             return 0;
1369         } else {
1370             rt->cur_rtp = NULL;
1371         }
1372     }
1373
1374     /* read next RTP packet */
1375  redo:
1376     switch(rt->lower_transport) {
1377     default:
1378     case RTSP_LOWER_TRANSPORT_TCP:
1379         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1380         break;
1381     case RTSP_LOWER_TRANSPORT_UDP:
1382     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1383         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1384         if (len >=0 && rtsp_st->rtp_ctx)
1385             rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1386         break;
1387     }
1388     if (len < 0)
1389         return len;
1390     if (rt->transport == RTSP_TRANSPORT_RDT)
1391         ret = ff_rdt_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1392     else
1393         ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1394     if (ret < 0)
1395         goto redo;
1396     if (ret == 1) {
1397         /* more packets may follow, so we save the RTP context */
1398         rt->cur_rtp = rtsp_st->rtp_ctx;
1399     }
1400     return 0;
1401 }
1402
1403 static int rtsp_read_play(AVFormatContext *s)
1404 {
1405     RTSPState *rt = s->priv_data;
1406     RTSPHeader reply1, *reply = &reply1;
1407     char cmd[1024];
1408
1409     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1410
1411     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1412         if (rt->state == RTSP_STATE_PAUSED) {
1413             snprintf(cmd, sizeof(cmd),
1414                      "PLAY %s RTSP/1.0\r\n",
1415                      s->filename);
1416         } else {
1417             snprintf(cmd, sizeof(cmd),
1418                      "PLAY %s RTSP/1.0\r\n"
1419                      "Range: npt=%0.3f-\r\n",
1420                      s->filename,
1421                      (double)rt->seek_timestamp / AV_TIME_BASE);
1422         }
1423         rtsp_send_cmd(s, cmd, reply, NULL);
1424         if (reply->status_code != RTSP_STATUS_OK) {
1425             return -1;
1426         }
1427     }
1428     rt->state = RTSP_STATE_PLAYING;
1429     return 0;
1430 }
1431
1432 /* pause the stream */
1433 static int rtsp_read_pause(AVFormatContext *s)
1434 {
1435     RTSPState *rt = s->priv_data;
1436     RTSPHeader reply1, *reply = &reply1;
1437     char cmd[1024];
1438
1439     rt = s->priv_data;
1440
1441     if (rt->state != RTSP_STATE_PLAYING)
1442         return 0;
1443     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1444         snprintf(cmd, sizeof(cmd),
1445                  "PAUSE %s RTSP/1.0\r\n",
1446                  s->filename);
1447         rtsp_send_cmd(s, cmd, reply, NULL);
1448         if (reply->status_code != RTSP_STATUS_OK) {
1449             return -1;
1450         }
1451     }
1452     rt->state = RTSP_STATE_PAUSED;
1453     return 0;
1454 }
1455
1456 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1457                           int64_t timestamp, int flags)
1458 {
1459     RTSPState *rt = s->priv_data;
1460
1461     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1462     switch(rt->state) {
1463     default:
1464     case RTSP_STATE_IDLE:
1465         break;
1466     case RTSP_STATE_PLAYING:
1467         if (rtsp_read_play(s) != 0)
1468             return -1;
1469         break;
1470     case RTSP_STATE_PAUSED:
1471         rt->state = RTSP_STATE_IDLE;
1472         break;
1473     }
1474     return 0;
1475 }
1476
1477 static int rtsp_read_close(AVFormatContext *s)
1478 {
1479     RTSPState *rt = s->priv_data;
1480     RTSPHeader reply1, *reply = &reply1;
1481     char cmd[1024];
1482
1483 #if 0
1484     /* NOTE: it is valid to flush the buffer here */
1485     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1486         url_fclose(&rt->rtsp_gb);
1487     }
1488 #endif
1489     snprintf(cmd, sizeof(cmd),
1490              "TEARDOWN %s RTSP/1.0\r\n",
1491              s->filename);
1492     rtsp_send_cmd(s, cmd, reply, NULL);
1493
1494     rtsp_close_streams(rt);
1495     url_close(rt->rtsp_hd);
1496     return 0;
1497 }
1498
1499 #ifdef CONFIG_RTSP_DEMUXER
1500 AVInputFormat rtsp_demuxer = {
1501     "rtsp",
1502     NULL_IF_CONFIG_SMALL("RTSP input format"),
1503     sizeof(RTSPState),
1504     rtsp_probe,
1505     rtsp_read_header,
1506     rtsp_read_packet,
1507     rtsp_read_close,
1508     rtsp_read_seek,
1509     .flags = AVFMT_NOFILE,
1510     .read_play = rtsp_read_play,
1511     .read_pause = rtsp_read_pause,
1512 };
1513 #endif
1514
1515 static int sdp_probe(AVProbeData *p1)
1516 {
1517     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1518
1519     /* we look for a line beginning "c=IN IP4" */
1520     while (p < p_end && *p != '\0') {
1521         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1522             return AVPROBE_SCORE_MAX / 2;
1523
1524         while(p < p_end - 1 && *p != '\n') p++;
1525         if (++p >= p_end)
1526             break;
1527         if (*p == '\r')
1528             p++;
1529     }
1530     return 0;
1531 }
1532
1533 #define SDP_MAX_SIZE 8192
1534
1535 static int sdp_read_header(AVFormatContext *s,
1536                            AVFormatParameters *ap)
1537 {
1538     RTSPState *rt = s->priv_data;
1539     RTSPStream *rtsp_st;
1540     int size, i, err;
1541     char *content;
1542     char url[1024];
1543
1544     /* read the whole sdp file */
1545     /* XXX: better loading */
1546     content = av_malloc(SDP_MAX_SIZE);
1547     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1548     if (size <= 0) {
1549         av_free(content);
1550         return AVERROR_INVALIDDATA;
1551     }
1552     content[size] ='\0';
1553
1554     sdp_parse(s, content);
1555     av_free(content);
1556
1557     /* open each RTP stream */
1558     for(i=0;i<rt->nb_rtsp_streams;i++) {
1559         rtsp_st = rt->rtsp_streams[i];
1560
1561         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1562                  inet_ntoa(rtsp_st->sdp_ip),
1563                  rtsp_st->sdp_port,
1564                  rtsp_st->sdp_port,
1565                  rtsp_st->sdp_ttl);
1566         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1567             err = AVERROR_INVALIDDATA;
1568             goto fail;
1569         }
1570         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1571             goto fail;
1572     }
1573     return 0;
1574  fail:
1575     rtsp_close_streams(rt);
1576     return err;
1577 }
1578
1579 static int sdp_read_packet(AVFormatContext *s,
1580                             AVPacket *pkt)
1581 {
1582     return rtsp_read_packet(s, pkt);
1583 }
1584
1585 static int sdp_read_close(AVFormatContext *s)
1586 {
1587     RTSPState *rt = s->priv_data;
1588     rtsp_close_streams(rt);
1589     return 0;
1590 }
1591
1592 #ifdef CONFIG_SDP_DEMUXER
1593 AVInputFormat sdp_demuxer = {
1594     "sdp",
1595     NULL_IF_CONFIG_SMALL("SDP"),
1596     sizeof(RTSPState),
1597     sdp_probe,
1598     sdp_read_header,
1599     sdp_read_packet,
1600     sdp_read_close,
1601 };
1602 #endif
1603
1604 #ifdef CONFIG_REDIR_DEMUXER
1605 /* dummy redirector format (used directly in av_open_input_file now) */
1606 static int redir_probe(AVProbeData *pd)
1607 {
1608     const char *p;
1609     p = pd->buf;
1610     while (redir_isspace(*p))
1611         p++;
1612     if (av_strstart(p, "http://", NULL) ||
1613         av_strstart(p, "rtsp://", NULL))
1614         return AVPROBE_SCORE_MAX;
1615     return 0;
1616 }
1617
1618 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1619 {
1620     char buf[4096], *q;
1621     int c;
1622     AVFormatContext *ic = NULL;
1623     ByteIOContext *f = s->pb;
1624
1625     /* parse each URL and try to open it */
1626     c = url_fgetc(f);
1627     while (c != URL_EOF) {
1628         /* skip spaces */
1629         for(;;) {
1630             if (!redir_isspace(c))
1631                 break;
1632             c = url_fgetc(f);
1633         }
1634         if (c == URL_EOF)
1635             break;
1636         /* record url */
1637         q = buf;
1638         for(;;) {
1639             if (c == URL_EOF || redir_isspace(c))
1640                 break;
1641             if ((q - buf) < sizeof(buf) - 1)
1642                 *q++ = c;
1643             c = url_fgetc(f);
1644         }
1645         *q = '\0';
1646         //printf("URL='%s'\n", buf);
1647         /* try to open the media file */
1648         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1649             break;
1650     }
1651     if (!ic)
1652         return AVERROR(EIO);
1653
1654     *s = *ic;
1655     url_fclose(f);
1656
1657     return 0;
1658 }
1659
1660 AVInputFormat redir_demuxer = {
1661     "redir",
1662     NULL_IF_CONFIG_SMALL("Redirector format"),
1663     0,
1664     redir_probe,
1665     redir_read_header,
1666     NULL,
1667     NULL,
1668 };
1669 #endif