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     void *cur_tx;
  77     int need_subscription;
  78 } RTSPState;
  79
  80 typedef struct RTSPStream {
  81     URLContext *rtp_handle; /* RTP stream handle */
  82     void *tx_ctx; /* RTP/RDT 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     PayloadContext *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 const 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     enum CodecType codec_type;
 393     int payload_type, i;
 394     AVStream *st;
 395     RTSPStream *rtsp_st;
 396     struct in_addr sdp_ip;
 397     int ttl;
 398
 399 #ifdef DEBUG
 400     printf("sdp: %c='%s'\n", letter, buf);
 401 #endif
 402
 403     p = buf;
 404     switch(letter) {
 405     case 'c':
 406         get_word(buf1, sizeof(buf1), &p);
 407         if (strcmp(buf1, "IN") != 0)
 408             return;
 409         get_word(buf1, sizeof(buf1), &p);
 410         if (strcmp(buf1, "IP4") != 0)
 411             return;
 412         get_word_sep(buf1, sizeof(buf1), "/", &p);
 413         if (inet_aton(buf1, &sdp_ip) == 0)
 414             return;
 415         ttl = 16;
 416         if (*p == '/') {
 417             p++;
 418             get_word_sep(buf1, sizeof(buf1), "/", &p);
 419             ttl = atoi(buf1);
 420         }
 421         if (s->nb_streams == 0) {
 422             s1->default_ip = sdp_ip;
 423             s1->default_ttl = ttl;
 424         } else {
 425             st = s->streams[s->nb_streams - 1];
 426             rtsp_st = st->priv_data;
 427             rtsp_st->sdp_ip = sdp_ip;
 428             rtsp_st->sdp_ttl = ttl;
 429         }
 430         break;
 431     case 's':
 432         av_strlcpy(s->title, p, sizeof(s->title));
 433         break;
 434     case 'i':
 435         if (s->nb_streams == 0) {
 436             av_strlcpy(s->comment, p, sizeof(s->comment));
 437             break;
 438         }
 439         break;
 440     case 'm':
 441         /* new stream */
 442         get_word(st_type, sizeof(st_type), &p);
 443         if (!strcmp(st_type, "audio")) {
 444             codec_type = CODEC_TYPE_AUDIO;
 445         } else if (!strcmp(st_type, "video")) {
 446             codec_type = CODEC_TYPE_VIDEO;
 447         } else {
 448             return;
 449         }
 450         rtsp_st = av_mallocz(sizeof(RTSPStream));
 451         if (!rtsp_st)
 452             return;
 453         rtsp_st->stream_index = -1;
 454         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 455
 456         rtsp_st->sdp_ip = s1->default_ip;
 457         rtsp_st->sdp_ttl = s1->default_ttl;
 458
 459         get_word(buf1, sizeof(buf1), &p); /* port */
 460         rtsp_st->sdp_port = atoi(buf1);
 461
 462         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 463
 464         /* XXX: handle list of formats */
 465         get_word(buf1, sizeof(buf1), &p); /* format list */
 466         rtsp_st->sdp_payload_type = atoi(buf1);
 467
 468         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 469             /* no corresponding stream */
 470         } else {
 471             st = av_new_stream(s, 0);
 472             if (!st)
 473                 return;
 474             st->priv_data = rtsp_st;
 475             rtsp_st->stream_index = st->index;
 476             st->codec->codec_type = codec_type;
 477             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 478                 /* if standard payload type, we can find the codec right now */
 479                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 480             }
 481         }
 482         /* put a default control url */
 483         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 484         break;
 485     case 'a':
 486         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 487             char proto[32];
 488             /* get the control url */
 489             st = s->streams[s->nb_streams - 1];
 490             rtsp_st = st->priv_data;
 491
 492             /* XXX: may need to add full url resolution */
 493             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 494             if (proto[0] == '\0') {
 495                 /* relative control URL */
 496                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 497                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 498             } else {
 499                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 500             }
 501         } else if (av_strstart(p, "rtpmap:", &p)) {
 502             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 503             get_word(buf1, sizeof(buf1), &p);
 504             payload_type = atoi(buf1);
 505             for(i = 0; i < s->nb_streams;i++) {
 506                 st = s->streams[i];
 507                 rtsp_st = st->priv_data;
 508                 if (rtsp_st->sdp_payload_type == payload_type) {
 509                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 510                 }
 511             }
 512         } else if (av_strstart(p, "fmtp:", &p)) {
 513             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 514             get_word(buf1, sizeof(buf1), &p);
 515             payload_type = atoi(buf1);
 516             for(i = 0; i < s->nb_streams;i++) {
 517                 st = s->streams[i];
 518                 rtsp_st = st->priv_data;
 519                 if (rtsp_st->sdp_payload_type == payload_type) {
 520                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 521                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 522                             sdp_parse_fmtp(st, p);
 523                         }
 524                     } else {
 525                         sdp_parse_fmtp(st, p);
 526                     }
 527                 }
 528             }
 529         } else if(av_strstart(p, "framesize:", &p)) {
 530             // let dynamic protocol handlers have a stab at the line.
 531             get_word(buf1, sizeof(buf1), &p);
 532             payload_type = atoi(buf1);
 533             for(i = 0; i < s->nb_streams;i++) {
 534                 st = s->streams[i];
 535                 rtsp_st = st->priv_data;
 536                 if (rtsp_st->sdp_payload_type == payload_type) {
 537                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 538                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 539                     }
 540                 }
 541             }
 542         } else if(av_strstart(p, "range:", &p)) {
 543             int64_t start, end;
 544
 545             // this is so that seeking on a streamed file can work.
 546             rtsp_parse_range_npt(p, &start, &end);
 547             s->start_time= start;
 548             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 549         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 550             if (atoi(p) == 1)
 551                 rt->transport = RTSP_TRANSPORT_RDT;
 552         } else if (s->nb_streams > 0) {
 553             rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 554             if (rtsp_st->dynamic_handler &&
 555                 rtsp_st->dynamic_handler->parse_sdp_a_line)
 556                 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
 557                     rtsp_st->dynamic_protocol_context, buf);
 558         }
 559         break;
 560     }
 561 }
 562
 563 static int sdp_parse(AVFormatContext *s, const char *content)
 564 {
 565     const char *p;
 566     int letter;
 567     char buf[2048], *q;
 568     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 569
 570     memset(s1, 0, sizeof(SDPParseState));
 571     p = content;
 572     for(;;) {
 573         skip_spaces(&p);
 574         letter = *p;
 575         if (letter == '\0')
 576             break;
 577         p++;
 578         if (*p != '=')
 579             goto next_line;
 580         p++;
 581         /* get the content */
 582         q = buf;
 583         while (*p != '\n' && *p != '\r' && *p != '\0') {
 584             if ((q - buf) < sizeof(buf) - 1)
 585                 *q++ = *p;
 586             p++;
 587         }
 588         *q = '\0';
 589         sdp_parse_line(s, s1, letter, buf);
 590     next_line:
 591         while (*p != '\n' && *p != '\0')
 592             p++;
 593         if (*p == '\n')
 594             p++;
 595     }
 596     return 0;
 597 }
 598
 599 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 600 {
 601     const char *p;
 602     int v;
 603
 604     p = *pp;
 605     skip_spaces(&p);
 606     v = strtol(p, (char **)&p, 10);
 607     if (*p == '-') {
 608         p++;
 609         *min_ptr = v;
 610         v = strtol(p, (char **)&p, 10);
 611         *max_ptr = v;
 612     } else {
 613         *min_ptr = v;
 614         *max_ptr = v;
 615     }
 616     *pp = p;
 617 }
 618
 619 /* XXX: only one transport specification is parsed */
 620 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 621 {
 622     char transport_protocol[16];
 623     char profile[16];
 624     char lower_transport[16];
 625     char parameter[16];
 626     RTSPTransportField *th;
 627     char buf[256];
 628
 629     reply->nb_transports = 0;
 630
 631     for(;;) {
 632         skip_spaces(&p);
 633         if (*p == '\0')
 634             break;
 635
 636         th = &reply->transports[reply->nb_transports];
 637
 638         get_word_sep(transport_protocol, sizeof(transport_protocol),
 639                      "/", &p);
 640         if (*p == '/')
 641             p++;
 642         if (!strcasecmp (transport_protocol, "rtp")) {
 643             get_word_sep(profile, sizeof(profile), "/;,", &p);
 644             lower_transport[0] = '\0';
 645             /* rtp/avp/<protocol> */
 646             if (*p == '/') {
 647                 p++;
 648                 get_word_sep(lower_transport, sizeof(lower_transport),
 649                              ";,", &p);
 650             }
 651             th->transport = RTSP_TRANSPORT_RTP;
 652         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 653                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 654             /* x-pn-tng/<protocol> */
 655             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 656             profile[0] = '\0';
 657             th->transport = RTSP_TRANSPORT_RDT;
 658         }
 659         if (!strcasecmp(lower_transport, "TCP"))
 660             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 661         else
 662             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 663
 664         if (*p == ';')
 665             p++;
 666         /* get each parameter */
 667         while (*p != '\0' && *p != ',') {
 668             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 669             if (!strcmp(parameter, "port")) {
 670                 if (*p == '=') {
 671                     p++;
 672                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 673                 }
 674             } else if (!strcmp(parameter, "client_port")) {
 675                 if (*p == '=') {
 676                     p++;
 677                     rtsp_parse_range(&th->client_port_min,
 678                                      &th->client_port_max, &p);
 679                 }
 680             } else if (!strcmp(parameter, "server_port")) {
 681                 if (*p == '=') {
 682                     p++;
 683                     rtsp_parse_range(&th->server_port_min,
 684                                      &th->server_port_max, &p);
 685                 }
 686             } else if (!strcmp(parameter, "interleaved")) {
 687                 if (*p == '=') {
 688                     p++;
 689                     rtsp_parse_range(&th->interleaved_min,
 690                                      &th->interleaved_max, &p);
 691                 }
 692             } else if (!strcmp(parameter, "multicast")) {
 693                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 694                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 695             } else if (!strcmp(parameter, "ttl")) {
 696                 if (*p == '=') {
 697                     p++;
 698                     th->ttl = strtol(p, (char **)&p, 10);
 699                 }
 700             } else if (!strcmp(parameter, "destination")) {
 701                 struct in_addr ipaddr;
 702
 703                 if (*p == '=') {
 704                     p++;
 705                     get_word_sep(buf, sizeof(buf), ";,", &p);
 706                     if (inet_aton(buf, &ipaddr))
 707                         th->destination = ntohl(ipaddr.s_addr);
 708                 }
 709             }
 710             while (*p != ';' && *p != '\0' && *p != ',')
 711                 p++;
 712             if (*p == ';')
 713                 p++;
 714         }
 715         if (*p == ',')
 716             p++;
 717
 718         reply->nb_transports++;
 719     }
 720 }
 721
 722 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 723 {
 724     const char *p;
 725
 726     /* NOTE: we do case independent match for broken servers */
 727     p = buf;
 728     if (av_stristart(p, "Session:", &p)) {
 729         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 730     } else if (av_stristart(p, "Content-Length:", &p)) {
 731         reply->content_length = strtol(p, NULL, 10);
 732     } else if (av_stristart(p, "Transport:", &p)) {
 733         rtsp_parse_transport(reply, p);
 734     } else if (av_stristart(p, "CSeq:", &p)) {
 735         reply->seq = strtol(p, NULL, 10);
 736     } else if (av_stristart(p, "Range:", &p)) {
 737         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 738     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 739         skip_spaces(&p);
 740         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 741     }
 742 }
 743
 744 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 745 {
 746     int ret, len;
 747
 748     len = 0;
 749     while (len < size) {
 750         ret = url_read(h, buf+len, size-len);
 751         if (ret < 1)
 752             return ret;
 753         len += ret;
 754     }
 755     return len;
 756 }
 757
 758 /* skip a RTP/TCP interleaved packet */
 759 static void rtsp_skip_packet(AVFormatContext *s)
 760 {
 761     RTSPState *rt = s->priv_data;
 762     int ret, len, len1;
 763     uint8_t buf[1024];
 764
 765     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 766     if (ret != 3)
 767         return;
 768     len = AV_RB16(buf + 1);
 769 #ifdef DEBUG
 770     printf("skipping RTP packet len=%d\n", len);
 771 #endif
 772     /* skip payload */
 773     while (len > 0) {
 774         len1 = len;
 775         if (len1 > sizeof(buf))
 776             len1 = sizeof(buf);
 777         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 778         if (ret != len1)
 779             return;
 780         len -= len1;
 781     }
 782 }
 783
 784 static void rtsp_send_cmd(AVFormatContext *s,
 785                           const char *cmd, RTSPHeader *reply,
 786                           unsigned char **content_ptr)
 787 {
 788     RTSPState *rt = s->priv_data;
 789     char buf[4096], buf1[1024], *q;
 790     unsigned char ch;
 791     const char *p;
 792     int content_length, line_count;
 793     unsigned char *content = NULL;
 794
 795     memset(reply, 0, sizeof(RTSPHeader));
 796
 797     rt->seq++;
 798     av_strlcpy(buf, cmd, sizeof(buf));
 799     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 800     av_strlcat(buf, buf1, sizeof(buf));
 801     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 802         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 803         av_strlcat(buf, buf1, sizeof(buf));
 804     }
 805     av_strlcat(buf, "\r\n", sizeof(buf));
 806 #ifdef DEBUG
 807     printf("Sending:\n%s--\n", buf);
 808 #endif
 809     url_write(rt->rtsp_hd, buf, strlen(buf));
 810
 811     /* parse reply (XXX: use buffers) */
 812     line_count = 0;
 813     rt->last_reply[0] = '\0';
 814     for(;;) {
 815         q = buf;
 816         for(;;) {
 817             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 818                 break;
 819             if (ch == '\n')
 820                 break;
 821             if (ch == '$') {
 822                 /* XXX: only parse it if first char on line ? */
 823                 rtsp_skip_packet(s);
 824             } else if (ch != '\r') {
 825                 if ((q - buf) < sizeof(buf) - 1)
 826                     *q++ = ch;
 827             }
 828         }
 829         *q = '\0';
 830 #ifdef DEBUG
 831         printf("line='%s'\n", buf);
 832 #endif
 833         /* test if last line */
 834         if (buf[0] == '\0')
 835             break;
 836         p = buf;
 837         if (line_count == 0) {
 838             /* get reply code */
 839             get_word(buf1, sizeof(buf1), &p);
 840             get_word(buf1, sizeof(buf1), &p);
 841             reply->status_code = atoi(buf1);
 842         } else {
 843             rtsp_parse_line(reply, p);
 844             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 845             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 846         }
 847         line_count++;
 848     }
 849
 850     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 851         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 852
 853     content_length = reply->content_length;
 854     if (content_length > 0) {
 855         /* leave some room for a trailing '\0' (useful for simple parsing) */
 856         content = av_malloc(content_length + 1);
 857         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 858         content[content_length] = '\0';
 859     }
 860     if (content_ptr)
 861         *content_ptr = content;
 862     else
 863         av_free(content);
 864 }
 865
 866
 867 /* close and free RTSP streams */
 868 static void rtsp_close_streams(RTSPState *rt)
 869 {
 870     int i;
 871     RTSPStream *rtsp_st;
 872
 873     for(i=0;i<rt->nb_rtsp_streams;i++) {
 874         rtsp_st = rt->rtsp_streams[i];
 875         if (rtsp_st) {
 876             if (rtsp_st->tx_ctx) {
 877                 if (rt->transport == RTSP_TRANSPORT_RDT)
 878                     ff_rdt_parse_close(rtsp_st->tx_ctx);
 879                 else
 880                     rtp_parse_close(rtsp_st->tx_ctx);
 881             }
 882             if (rtsp_st->rtp_handle)
 883                 url_close(rtsp_st->rtp_handle);
 884             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 885                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 886         }
 887     }
 888     av_free(rt->rtsp_streams);
 889 }
 890
 891 static int
 892 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 893 {
 894     RTSPState *rt = s->priv_data;
 895     AVStream *st = NULL;
 896
 897     /* open the RTP context */
 898     if (rtsp_st->stream_index >= 0)
 899         st = s->streams[rtsp_st->stream_index];
 900     if (!st)
 901         s->ctx_flags |= AVFMTCTX_NOHEADER;
 902
 903     if (rt->transport == RTSP_TRANSPORT_RDT)
 904         rtsp_st->tx_ctx = ff_rdt_parse_open(s, st,
 905                                             rtsp_st->dynamic_protocol_context,
 906                                             rtsp_st->dynamic_handler);
 907     else
 908         rtsp_st->tx_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 909                                          rtsp_st->sdp_payload_type,
 910                                          &rtsp_st->rtp_payload_data);
 911
 912     if (!rtsp_st->tx_ctx) {
 913          return AVERROR(ENOMEM);
 914     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 915         if(rtsp_st->dynamic_handler) {
 916             rtp_parse_set_dynamic_protocol(rtsp_st->tx_ctx,
 917                                            rtsp_st->dynamic_protocol_context,
 918                                            rtsp_st->dynamic_handler);
 919         }
 920     }
 921
 922     return 0;
 923 }
 924
 925 /**
 926  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 927  */
 928 static int
 929 make_setup_request (AVFormatContext *s, const char *host, int port,
 930                     int lower_transport, const char *real_challenge)
 931 {
 932     RTSPState *rt = s->priv_data;
 933     int j, i, err;
 934     RTSPStream *rtsp_st;
 935     RTSPHeader reply1, *reply = &reply1;
 936     char cmd[2048];
 937     const char *trans_pref;
 938
 939     if (rt->transport == RTSP_TRANSPORT_RDT)
 940         trans_pref = "x-pn-tng";
 941     else
 942         trans_pref = "RTP/AVP";
 943
 944     /* for each stream, make the setup request */
 945     /* XXX: we assume the same server is used for the control of each
 946        RTSP stream */
 947
 948     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 949         char transport[2048];
 950
 951         rtsp_st = rt->rtsp_streams[i];
 952
 953         /* RTP/UDP */
 954         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
 955             char buf[256];
 956
 957             /* first try in specified port range */
 958             if (RTSP_RTP_PORT_MIN != 0) {
 959                 while(j <= RTSP_RTP_PORT_MAX) {
 960                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 961                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 962                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 963                         goto rtp_opened;
 964                     }
 965                 }
 966             }
 967
 968 /*            then try on any port
 969 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 970 **                err = AVERROR_INVALIDDATA;
 971 **                goto fail;
 972 **            }
 973 */
 974
 975         rtp_opened:
 976             port = rtp_get_local_port(rtsp_st->rtp_handle);
 977             snprintf(transport, sizeof(transport) - 1,
 978                      "%s/UDP;", trans_pref);
 979             if (rt->server_type != RTSP_SERVER_REAL)
 980                 av_strlcat(transport, "unicast;", sizeof(transport));
 981             av_strlcatf(transport, sizeof(transport),
 982                      "client_port=%d", port);
 983             if (rt->transport == RTSP_TRANSPORT_RTP)
 984                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
 985         }
 986
 987         /* RTP/TCP */
 988         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 989             snprintf(transport, sizeof(transport) - 1,
 990                      "%s/TCP", trans_pref);
 991         }
 992
 993         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
 994             snprintf(transport, sizeof(transport) - 1,
 995                      "%s/UDP;multicast", trans_pref);
 996         }
 997         if (rt->server_type == RTSP_SERVER_REAL)
 998             av_strlcat(transport, ";mode=play", sizeof(transport));
 999         snprintf(cmd, sizeof(cmd),
1000                  "SETUP %s RTSP/1.0\r\n"
1001                  "Transport: %s\r\n",
1002                  rtsp_st->control_url, transport);
1003         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1004             char real_res[41], real_csum[9];
1005             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1006                                               real_challenge);
1007             av_strlcatf(cmd, sizeof(cmd),
1008                         "If-Match: %s\r\n"
1009                         "RealChallenge2: %s, sd=%s\r\n",
1010                         rt->session_id, real_res, real_csum);
1011         }
1012         rtsp_send_cmd(s, cmd, reply, NULL);
1013         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1014             err = 1;
1015             goto fail;
1016         } else if (reply->status_code != RTSP_STATUS_OK ||
1017                    reply->nb_transports != 1) {
1018             err = AVERROR_INVALIDDATA;
1019             goto fail;
1020         }
1021
1022         /* XXX: same protocol for all streams is required */
1023         if (i > 0) {
1024             if (reply->transports[0].lower_transport != rt->lower_transport ||
1025                 reply->transports[0].transport != rt->transport) {
1026                 err = AVERROR_INVALIDDATA;
1027                 goto fail;
1028             }
1029         } else {
1030             rt->lower_transport = reply->transports[0].lower_transport;
1031             rt->transport = reply->transports[0].transport;
1032         }
1033
1034         /* close RTP connection if not choosen */
1035         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1036             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1037             url_close(rtsp_st->rtp_handle);
1038             rtsp_st->rtp_handle = NULL;
1039         }
1040
1041         switch(reply->transports[0].lower_transport) {
1042         case RTSP_LOWER_TRANSPORT_TCP:
1043             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1044             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1045             break;
1046
1047         case RTSP_LOWER_TRANSPORT_UDP:
1048             {
1049                 char url[1024];
1050
1051                 /* XXX: also use address if specified */
1052                 snprintf(url, sizeof(url), "rtp://%s:%d",
1053                          host, reply->transports[0].server_port_min);
1054                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1055                     err = AVERROR_INVALIDDATA;
1056                     goto fail;
1057                 }
1058             }
1059             break;
1060         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1061             {
1062                 char url[1024];
1063                 struct in_addr in;
1064
1065                 in.s_addr = htonl(reply->transports[0].destination);
1066                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1067                          inet_ntoa(in),
1068                          reply->transports[0].port_min,
1069                          reply->transports[0].ttl);
1070                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1071                     err = AVERROR_INVALIDDATA;
1072                     goto fail;
1073                 }
1074             }
1075             break;
1076         }
1077
1078         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1079             goto fail;
1080     }
1081
1082     if (rt->server_type == RTSP_SERVER_REAL)
1083         rt->need_subscription = 1;
1084
1085     return 0;
1086
1087 fail:
1088     for (i=0; i<rt->nb_rtsp_streams; i++) {
1089         if (rt->rtsp_streams[i]->rtp_handle) {
1090             url_close(rt->rtsp_streams[i]->rtp_handle);
1091             rt->rtsp_streams[i]->rtp_handle = NULL;
1092         }
1093     }
1094     return err;
1095 }
1096
1097 static int rtsp_read_header(AVFormatContext *s,
1098                             AVFormatParameters *ap)
1099 {
1100     RTSPState *rt = s->priv_data;
1101     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1102     URLContext *rtsp_hd;
1103     int port, ret, err;
1104     RTSPHeader reply1, *reply = &reply1;
1105     unsigned char *content = NULL;
1106     int lower_transport_mask = 0;
1107     char real_challenge[64];
1108
1109     /* extract hostname and port */
1110     url_split(NULL, 0, NULL, 0,
1111               host, sizeof(host), &port, path, sizeof(path), s->filename);
1112     if (port < 0)
1113         port = RTSP_DEFAULT_PORT;
1114
1115     /* search for options */
1116     option_list = strchr(path, '?');
1117     if (option_list) {
1118         /* remove the options from the path */
1119         *option_list++ = 0;
1120         while(option_list) {
1121             /* move the option pointer */
1122             option = option_list;
1123             option_list = strchr(option_list, '&');
1124             if (option_list)
1125                 *(option_list++) = 0;
1126             /* handle the options */
1127             if (strcmp(option, "udp") == 0)
1128                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1129             else if (strcmp(option, "multicast") == 0)
1130                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1131             else if (strcmp(option, "tcp") == 0)
1132                 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1133         }
1134     }
1135
1136     if (!lower_transport_mask)
1137         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_LAST) - 1;
1138
1139     /* open the tcp connexion */
1140     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1141     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1142         return AVERROR(EIO);
1143     rt->rtsp_hd = rtsp_hd;
1144     rt->seq = 0;
1145
1146     /* request options supported by the server; this also detects server type */
1147     for (rt->server_type = RTSP_SERVER_RTP;;) {
1148         snprintf(cmd, sizeof(cmd),
1149                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1150         if (rt->server_type == RTSP_SERVER_REAL)
1151             av_strlcat(cmd,
1152                        /**
1153                         * The following entries are required for proper
1154                         * streaming from a Realmedia server. They are
1155                         * interdependent in some way although we currently
1156                         * don't quite understand how. Values were copied
1157                         * from mplayer SVN r23589.
1158                         * @param CompanyID is a 16-byte ID in base64
1159                         * @param ClientChallenge is a 16-byte ID in hex
1160                         */
1161                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1162                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1163                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1164                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1165                        sizeof(cmd));
1166         rtsp_send_cmd(s, cmd, reply, NULL);
1167         if (reply->status_code != RTSP_STATUS_OK) {
1168             err = AVERROR_INVALIDDATA;
1169             goto fail;
1170         }
1171
1172         /* detect server type if not standard-compliant RTP */
1173         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1174             rt->server_type = RTSP_SERVER_REAL;
1175             continue;
1176         } else if (rt->server_type == RTSP_SERVER_REAL) {
1177             strcpy(real_challenge, reply->real_challenge);
1178         }
1179         break;
1180     }
1181
1182     /* describe the stream */
1183     snprintf(cmd, sizeof(cmd),
1184              "DESCRIBE %s RTSP/1.0\r\n"
1185              "Accept: application/sdp\r\n",
1186              s->filename);
1187     if (rt->server_type == RTSP_SERVER_REAL) {
1188         /**
1189          * The Require: attribute is needed for proper streaming from
1190          * Realmedia servers.
1191          */
1192         av_strlcat(cmd,
1193                    "Require: com.real.retain-entity-for-setup\r\n",
1194                    sizeof(cmd));
1195     }
1196     rtsp_send_cmd(s, cmd, reply, &content);
1197     if (!content) {
1198         err = AVERROR_INVALIDDATA;
1199         goto fail;
1200     }
1201     if (reply->status_code != RTSP_STATUS_OK) {
1202         err = AVERROR_INVALIDDATA;
1203         goto fail;
1204     }
1205
1206     /* now we got the SDP description, we parse it */
1207     ret = sdp_parse(s, (const char *)content);
1208     av_freep(&content);
1209     if (ret < 0) {
1210         err = AVERROR_INVALIDDATA;
1211         goto fail;
1212     }
1213
1214     do {
1215         int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1216
1217         err = make_setup_request(s, host, port, lower_transport,
1218                                  rt->server_type == RTSP_SERVER_REAL ?
1219                                      real_challenge : NULL);
1220         if (err < 0)
1221             goto fail;
1222         lower_transport_mask &= ~(1 << lower_transport);
1223         if (lower_transport_mask == 0 && err == 1) {
1224             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1225             goto fail;
1226         }
1227     } while (err);
1228
1229     rt->state = RTSP_STATE_IDLE;
1230     rt->seek_timestamp = 0; /* default is to start stream at position
1231                                zero */
1232     if (ap->initial_pause) {
1233         /* do not start immediately */
1234     } else {
1235         if (rtsp_read_play(s) < 0) {
1236             err = AVERROR_INVALIDDATA;
1237             goto fail;
1238         }
1239     }
1240     return 0;
1241  fail:
1242     rtsp_close_streams(rt);
1243     av_freep(&content);
1244     url_close(rt->rtsp_hd);
1245     return err;
1246 }
1247
1248 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1249                            uint8_t *buf, int buf_size)
1250 {
1251     RTSPState *rt = s->priv_data;
1252     int id, len, i, ret;
1253     RTSPStream *rtsp_st;
1254
1255 #ifdef DEBUG_RTP_TCP
1256     printf("tcp_read_packet:\n");
1257 #endif
1258  redo:
1259     for(;;) {
1260         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1261 #ifdef DEBUG_RTP_TCP
1262         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1263 #endif
1264         if (ret != 1)
1265             return -1;
1266         if (buf[0] == '$')
1267             break;
1268     }
1269     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1270     if (ret != 3)
1271         return -1;
1272     id = buf[0];
1273     len = AV_RB16(buf + 1);
1274 #ifdef DEBUG_RTP_TCP
1275     printf("id=%d len=%d\n", id, len);
1276 #endif
1277     if (len > buf_size || len < 12)
1278         goto redo;
1279     /* get the data */
1280     ret = url_readbuf(rt->rtsp_hd, buf, len);
1281     if (ret != len)
1282         return -1;
1283     if (rt->transport == RTSP_TRANSPORT_RDT &&
1284         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1285         return -1;
1286
1287     /* find the matching stream */
1288     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1289         rtsp_st = rt->rtsp_streams[i];
1290         if (id >= rtsp_st->interleaved_min &&
1291             id <= rtsp_st->interleaved_max)
1292             goto found;
1293     }
1294     goto redo;
1295  found:
1296     *prtsp_st = rtsp_st;
1297     return len;
1298 }
1299
1300 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1301                            uint8_t *buf, int buf_size)
1302 {
1303     RTSPState *rt = s->priv_data;
1304     RTSPStream *rtsp_st;
1305     fd_set rfds;
1306     int fd1, fd2, fd_max, n, i, ret;
1307     struct timeval tv;
1308
1309     for(;;) {
1310         if (url_interrupt_cb())
1311             return AVERROR(EINTR);
1312         FD_ZERO(&rfds);
1313         fd_max = -1;
1314         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1315             rtsp_st = rt->rtsp_streams[i];
1316             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1317             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1318             if (fd1 > fd_max)
1319                 fd_max = fd1;
1320             FD_SET(fd1, &rfds);
1321         }
1322         tv.tv_sec = 0;
1323         tv.tv_usec = 100 * 1000;
1324         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1325         if (n > 0) {
1326             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1327                 rtsp_st = rt->rtsp_streams[i];
1328                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1329                 if (FD_ISSET(fd1, &rfds)) {
1330                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1331                     if (ret > 0) {
1332                         *prtsp_st = rtsp_st;
1333                         return ret;
1334                     }
1335                 }
1336             }
1337         }
1338     }
1339 }
1340
1341 static int rtsp_read_packet(AVFormatContext *s,
1342                             AVPacket *pkt)
1343 {
1344     RTSPState *rt = s->priv_data;
1345     RTSPStream *rtsp_st;
1346     int ret, len;
1347     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1348
1349     if (rt->server_type == RTSP_SERVER_REAL && rt->need_subscription) {
1350         int i;
1351         RTSPHeader reply1, *reply = &reply1;
1352         char cmd[1024];
1353
1354         snprintf(cmd, sizeof(cmd),
1355                  "SET_PARAMETER %s RTSP/1.0\r\n"
1356                  "Subscribe: ",
1357                  s->filename);
1358         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1359             if (i != 0) av_strlcat(cmd, ",", sizeof(cmd));
1360             ff_rdt_subscribe_rule(cmd, sizeof(cmd), i, 0);
1361             if (rt->transport == RTSP_TRANSPORT_RDT)
1362                 ff_rdt_subscribe_rule2(
1363                     rt->rtsp_streams[i]->tx_ctx,
1364                     cmd, sizeof(cmd), i, 0);
1365         }
1366         av_strlcat(cmd, "\r\n", sizeof(cmd));
1367         rtsp_send_cmd(s, cmd, reply, NULL);
1368         if (reply->status_code != RTSP_STATUS_OK)
1369             return AVERROR_INVALIDDATA;
1370         rt->need_subscription = 0;
1371
1372         if (rt->state == RTSP_STATE_PLAYING)
1373             rtsp_read_play (s);
1374     }
1375
1376     /* get next frames from the same RTP packet */
1377     if (rt->cur_tx) {
1378         if (rt->transport == RTSP_TRANSPORT_RDT)
1379             ret = ff_rdt_parse_packet(rt->cur_tx, pkt, NULL, 0);
1380         else
1381             ret = rtp_parse_packet(rt->cur_tx, pkt, NULL, 0);
1382         if (ret == 0) {
1383             rt->cur_tx = NULL;
1384             return 0;
1385         } else if (ret == 1) {
1386             return 0;
1387         } else {
1388             rt->cur_tx = NULL;
1389         }
1390     }
1391
1392     /* read next RTP packet */
1393  redo:
1394     switch(rt->lower_transport) {
1395     default:
1396     case RTSP_LOWER_TRANSPORT_TCP:
1397         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1398         break;
1399     case RTSP_LOWER_TRANSPORT_UDP:
1400     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1401         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1402         if (len >=0 && rtsp_st->tx_ctx && rt->transport == RTSP_TRANSPORT_RTP)
1403             rtp_check_and_send_back_rr(rtsp_st->tx_ctx, len);
1404         break;
1405     }
1406     if (len < 0)
1407         return len;
1408     if (rt->transport == RTSP_TRANSPORT_RDT)
1409         ret = ff_rdt_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1410     else
1411         ret = rtp_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1412     if (ret < 0)
1413         goto redo;
1414     if (ret == 1) {
1415         /* more packets may follow, so we save the RTP context */
1416         rt->cur_tx = rtsp_st->tx_ctx;
1417     }
1418     return 0;
1419 }
1420
1421 static int rtsp_read_play(AVFormatContext *s)
1422 {
1423     RTSPState *rt = s->priv_data;
1424     RTSPHeader reply1, *reply = &reply1;
1425     char cmd[1024];
1426
1427     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1428
1429     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1430         if (rt->state == RTSP_STATE_PAUSED) {
1431             snprintf(cmd, sizeof(cmd),
1432                      "PLAY %s RTSP/1.0\r\n",
1433                      s->filename);
1434         } else {
1435             snprintf(cmd, sizeof(cmd),
1436                      "PLAY %s RTSP/1.0\r\n"
1437                      "Range: npt=%0.3f-\r\n",
1438                      s->filename,
1439                      (double)rt->seek_timestamp / AV_TIME_BASE);
1440         }
1441         rtsp_send_cmd(s, cmd, reply, NULL);
1442         if (reply->status_code != RTSP_STATUS_OK) {
1443             return -1;
1444         }
1445     }
1446     rt->state = RTSP_STATE_PLAYING;
1447     return 0;
1448 }
1449
1450 /* pause the stream */
1451 static int rtsp_read_pause(AVFormatContext *s)
1452 {
1453     RTSPState *rt = s->priv_data;
1454     RTSPHeader reply1, *reply = &reply1;
1455     char cmd[1024];
1456
1457     rt = s->priv_data;
1458
1459     if (rt->state != RTSP_STATE_PLAYING)
1460         return 0;
1461     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1462         snprintf(cmd, sizeof(cmd),
1463                  "PAUSE %s RTSP/1.0\r\n",
1464                  s->filename);
1465         rtsp_send_cmd(s, cmd, reply, NULL);
1466         if (reply->status_code != RTSP_STATUS_OK) {
1467             return -1;
1468         }
1469     }
1470     rt->state = RTSP_STATE_PAUSED;
1471     return 0;
1472 }
1473
1474 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1475                           int64_t timestamp, int flags)
1476 {
1477     RTSPState *rt = s->priv_data;
1478
1479     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1480     switch(rt->state) {
1481     default:
1482     case RTSP_STATE_IDLE:
1483         break;
1484     case RTSP_STATE_PLAYING:
1485         if (rtsp_read_play(s) != 0)
1486             return -1;
1487         break;
1488     case RTSP_STATE_PAUSED:
1489         rt->state = RTSP_STATE_IDLE;
1490         break;
1491     }
1492     return 0;
1493 }
1494
1495 static int rtsp_read_close(AVFormatContext *s)
1496 {
1497     RTSPState *rt = s->priv_data;
1498     RTSPHeader reply1, *reply = &reply1;
1499     char cmd[1024];
1500
1501 #if 0
1502     /* NOTE: it is valid to flush the buffer here */
1503     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1504         url_fclose(&rt->rtsp_gb);
1505     }
1506 #endif
1507     snprintf(cmd, sizeof(cmd),
1508              "TEARDOWN %s RTSP/1.0\r\n",
1509              s->filename);
1510     rtsp_send_cmd(s, cmd, reply, NULL);
1511
1512     rtsp_close_streams(rt);
1513     url_close(rt->rtsp_hd);
1514     return 0;
1515 }
1516
1517 #ifdef CONFIG_RTSP_DEMUXER
1518 AVInputFormat rtsp_demuxer = {
1519     "rtsp",
1520     NULL_IF_CONFIG_SMALL("RTSP input format"),
1521     sizeof(RTSPState),
1522     rtsp_probe,
1523     rtsp_read_header,
1524     rtsp_read_packet,
1525     rtsp_read_close,
1526     rtsp_read_seek,
1527     .flags = AVFMT_NOFILE,
1528     .read_play = rtsp_read_play,
1529     .read_pause = rtsp_read_pause,
1530 };
1531 #endif
1532
1533 static int sdp_probe(AVProbeData *p1)
1534 {
1535     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1536
1537     /* we look for a line beginning "c=IN IP4" */
1538     while (p < p_end && *p != '\0') {
1539         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1540             return AVPROBE_SCORE_MAX / 2;
1541
1542         while(p < p_end - 1 && *p != '\n') p++;
1543         if (++p >= p_end)
1544             break;
1545         if (*p == '\r')
1546             p++;
1547     }
1548     return 0;
1549 }
1550
1551 #define SDP_MAX_SIZE 8192
1552
1553 static int sdp_read_header(AVFormatContext *s,
1554                            AVFormatParameters *ap)
1555 {
1556     RTSPState *rt = s->priv_data;
1557     RTSPStream *rtsp_st;
1558     int size, i, err;
1559     char *content;
1560     char url[1024];
1561
1562     /* read the whole sdp file */
1563     /* XXX: better loading */
1564     content = av_malloc(SDP_MAX_SIZE);
1565     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1566     if (size <= 0) {
1567         av_free(content);
1568         return AVERROR_INVALIDDATA;
1569     }
1570     content[size] ='\0';
1571
1572     sdp_parse(s, content);
1573     av_free(content);
1574
1575     /* open each RTP stream */
1576     for(i=0;i<rt->nb_rtsp_streams;i++) {
1577         rtsp_st = rt->rtsp_streams[i];
1578
1579         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1580                  inet_ntoa(rtsp_st->sdp_ip),
1581                  rtsp_st->sdp_port,
1582                  rtsp_st->sdp_port,
1583                  rtsp_st->sdp_ttl);
1584         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1585             err = AVERROR_INVALIDDATA;
1586             goto fail;
1587         }
1588         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1589             goto fail;
1590     }
1591     return 0;
1592  fail:
1593     rtsp_close_streams(rt);
1594     return err;
1595 }
1596
1597 static int sdp_read_packet(AVFormatContext *s,
1598                             AVPacket *pkt)
1599 {
1600     return rtsp_read_packet(s, pkt);
1601 }
1602
1603 static int sdp_read_close(AVFormatContext *s)
1604 {
1605     RTSPState *rt = s->priv_data;
1606     rtsp_close_streams(rt);
1607     return 0;
1608 }
1609
1610 #ifdef CONFIG_SDP_DEMUXER
1611 AVInputFormat sdp_demuxer = {
1612     "sdp",
1613     NULL_IF_CONFIG_SMALL("SDP"),
1614     sizeof(RTSPState),
1615     sdp_probe,
1616     sdp_read_header,
1617     sdp_read_packet,
1618     sdp_read_close,
1619 };
1620 #endif
1621
1622 #ifdef CONFIG_REDIR_DEMUXER
1623 /* dummy redirector format (used directly in av_open_input_file now) */
1624 static int redir_probe(AVProbeData *pd)
1625 {
1626     const char *p;
1627     p = pd->buf;
1628     while (redir_isspace(*p))
1629         p++;
1630     if (av_strstart(p, "http://", NULL) ||
1631         av_strstart(p, "rtsp://", NULL))
1632         return AVPROBE_SCORE_MAX;
1633     return 0;
1634 }
1635
1636 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1637 {
1638     char buf[4096], *q;
1639     int c;
1640     AVFormatContext *ic = NULL;
1641     ByteIOContext *f = s->pb;
1642
1643     /* parse each URL and try to open it */
1644     c = url_fgetc(f);
1645     while (c != URL_EOF) {
1646         /* skip spaces */
1647         for(;;) {
1648             if (!redir_isspace(c))
1649                 break;
1650             c = url_fgetc(f);
1651         }
1652         if (c == URL_EOF)
1653             break;
1654         /* record url */
1655         q = buf;
1656         for(;;) {
1657             if (c == URL_EOF || redir_isspace(c))
1658                 break;
1659             if ((q - buf) < sizeof(buf) - 1)
1660                 *q++ = c;
1661             c = url_fgetc(f);
1662         }
1663         *q = '\0';
1664         //printf("URL='%s'\n", buf);
1665         /* try to open the media file */
1666         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1667             break;
1668     }
1669     if (!ic)
1670         return AVERROR(EIO);
1671
1672     *s = *ic;
1673     url_fclose(f);
1674
1675     return 0;
1676 }
1677
1678 AVInputFormat redir_demuxer = {
1679     "redir",
1680     NULL_IF_CONFIG_SMALL("Redirector format"),
1681     0,
1682     redir_probe,
1683     redir_read_header,
1684     NULL,
1685     NULL,
1686 };
1687 #endif