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 #include <unistd.h> /* for select() prototype */
  30 #include <strings.h>
  31 #include "network.h"
  32 #include "rtsp.h"
  33
  34 #include "rtp_internal.h"
  35
  36 //#define DEBUG
  37 //#define DEBUG_RTP_TCP
  38
  39 enum RTSPClientState {
  40     RTSP_STATE_IDLE,
  41     RTSP_STATE_PLAYING,
  42     RTSP_STATE_PAUSED,
  43 };
  44
  45 enum RTSPServerType {
  46     RTSP_SERVER_RTP, /*< Standard-compliant RTP-server */
  47     RTSP_SERVER_RDT, /*< Realmedia-style server */
  48     RTSP_SERVER_LAST
  49 };
  50
  51 typedef struct RTSPState {
  52     URLContext *rtsp_hd; /* RTSP TCP connexion handle */
  53     int nb_rtsp_streams;
  54     struct RTSPStream **rtsp_streams;
  55
  56     enum RTSPClientState state;
  57     int64_t seek_timestamp;
  58
  59     /* XXX: currently we use unbuffered input */
  60     //    ByteIOContext rtsp_gb;
  61     int seq;        /* RTSP command sequence number */
  62     char session_id[512];
  63     enum RTSPProtocol protocol;
  64     enum RTSPServerType server_type;
  65     char last_reply[2048]; /* XXX: allocate ? */
  66     RTPDemuxContext *cur_rtp;
  67 } RTSPState;
  68
  69 typedef struct RTSPStream {
  70     URLContext *rtp_handle; /* RTP stream handle */
  71     RTPDemuxContext *rtp_ctx; /* RTP parse context */
  72
  73     int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
  74     int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
  75     char control_url[1024]; /* url for this stream (from SDP) */
  76
  77     int sdp_port; /* port (from SDP content - not used in RTSP) */
  78     struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
  79     int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
  80     int sdp_payload_type; /* payload type - only used in SDP */
  81     rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
  82
  83     RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
  84     void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
  85 } RTSPStream;
  86
  87 static int rtsp_read_play(AVFormatContext *s);
  88
  89 /* XXX: currently, the only way to change the protocols consists in
  90    changing this variable */
  91
  92 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  93 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
  94 #endif
  95
  96 static int rtsp_probe(AVProbeData *p)
  97 {
  98     if (av_strstart(p->filename, "rtsp:", NULL))
  99         return AVPROBE_SCORE_MAX;
 100     return 0;
 101 }
 102
 103 static int redir_isspace(int c)
 104 {
 105     return c == ' ' || c == '\t' || c == '\n' || c == '\r';
 106 }
 107
 108 static void skip_spaces(const char **pp)
 109 {
 110     const char *p;
 111     p = *pp;
 112     while (redir_isspace(*p))
 113         p++;
 114     *pp = p;
 115 }
 116
 117 static void get_word_sep(char *buf, int buf_size, const char *sep,
 118                          const char **pp)
 119 {
 120     const char *p;
 121     char *q;
 122
 123     p = *pp;
 124     if (*p == '/')
 125         p++;
 126     skip_spaces(&p);
 127     q = buf;
 128     while (!strchr(sep, *p) && *p != '\0') {
 129         if ((q - buf) < buf_size - 1)
 130             *q++ = *p;
 131         p++;
 132     }
 133     if (buf_size > 0)
 134         *q = '\0';
 135     *pp = p;
 136 }
 137
 138 static void get_word(char *buf, int buf_size, const char **pp)
 139 {
 140     const char *p;
 141     char *q;
 142
 143     p = *pp;
 144     skip_spaces(&p);
 145     q = buf;
 146     while (!redir_isspace(*p) && *p != '\0') {
 147         if ((q - buf) < buf_size - 1)
 148             *q++ = *p;
 149         p++;
 150     }
 151     if (buf_size > 0)
 152         *q = '\0';
 153     *pp = p;
 154 }
 155
 156 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 157    params>] */
 158 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 159 {
 160     char buf[256];
 161     int i;
 162     AVCodec *c;
 163     const char *c_name;
 164
 165     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 166        see if we can handle this kind of payload */
 167     get_word_sep(buf, sizeof(buf), "/", &p);
 168     if (payload_type >= RTP_PT_PRIVATE) {
 169         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 170         while(handler) {
 171             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 172                 codec->codec_id = handler->codec_id;
 173                 rtsp_st->dynamic_handler= handler;
 174                 if(handler->open) {
 175                     rtsp_st->dynamic_protocol_context= handler->open();
 176                 }
 177                 break;
 178             }
 179             handler= handler->next;
 180         }
 181     } else {
 182         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 183         /* search into AVRtpPayloadTypes[] */
 184         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 185     }
 186
 187     c = avcodec_find_decoder(codec->codec_id);
 188     if (c && c->name)
 189         c_name = c->name;
 190     else
 191         c_name = (char *)NULL;
 192
 193     if (c_name) {
 194         get_word_sep(buf, sizeof(buf), "/", &p);
 195         i = atoi(buf);
 196         switch (codec->codec_type) {
 197             case CODEC_TYPE_AUDIO:
 198                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 199                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 200                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 201                 if (i > 0) {
 202                     codec->sample_rate = i;
 203                     get_word_sep(buf, sizeof(buf), "/", &p);
 204                     i = atoi(buf);
 205                     if (i > 0)
 206                         codec->channels = i;
 207                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 208                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 209                 }
 210                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 211                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 212                 break;
 213             case CODEC_TYPE_VIDEO:
 214                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 215                 break;
 216             default:
 217                 break;
 218         }
 219         return 0;
 220     }
 221
 222     return -1;
 223 }
 224
 225 /* return the length and optionnaly the data */
 226 static int hex_to_data(uint8_t *data, const char *p)
 227 {
 228     int c, len, v;
 229
 230     len = 0;
 231     v = 1;
 232     for(;;) {
 233         skip_spaces(&p);
 234         if (p == '\0')
 235             break;
 236         c = toupper((unsigned char)*p++);
 237         if (c >= '0' && c <= '9')
 238             c = c - '0';
 239         else if (c >= 'A' && c <= 'F')
 240             c = c - 'A' + 10;
 241         else
 242             break;
 243         v = (v << 4) | c;
 244         if (v & 0x100) {
 245             if (data)
 246                 data[len] = v;
 247             len++;
 248             v = 1;
 249         }
 250     }
 251     return len;
 252 }
 253
 254 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 255 {
 256     switch (codec->codec_id) {
 257         case CODEC_ID_MPEG4:
 258         case CODEC_ID_AAC:
 259             if (!strcmp(attr, "config")) {
 260                 /* decode the hexa encoded parameter */
 261                 int len = hex_to_data(NULL, value);
 262                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 263                 if (!codec->extradata)
 264                     return;
 265                 codec->extradata_size = len;
 266                 hex_to_data(codec->extradata, value);
 267             }
 268             break;
 269         default:
 270             break;
 271     }
 272     return;
 273 }
 274
 275 typedef struct attrname_map
 276 {
 277     const char *str;
 278     uint16_t type;
 279     uint32_t offset;
 280 } attrname_map_t;
 281
 282 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 283 #define ATTR_NAME_TYPE_INT 0
 284 #define ATTR_NAME_TYPE_STR 1
 285 static attrname_map_t attr_names[]=
 286 {
 287     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
 288     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
 289     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
 290     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
 291     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
 292     {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
 293     {NULL, -1, -1},
 294 };
 295
 296 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 297 * because it is used in rtp_h264.c, which is forthcoming.
 298 */
 299 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 300 {
 301     skip_spaces(p);
 302     if(**p)
 303     {
 304         get_word_sep(attr, attr_size, "=", p);
 305         if (**p == '=')
 306             (*p)++;
 307         get_word_sep(value, value_size, ";", p);
 308         if (**p == ';')
 309             (*p)++;
 310         return 1;
 311     }
 312     return 0;
 313 }
 314
 315 /* parse a SDP line and save stream attributes */
 316 static void sdp_parse_fmtp(AVStream *st, const char *p)
 317 {
 318     char attr[256];
 319     char value[4096];
 320     int i;
 321
 322     RTSPStream *rtsp_st = st->priv_data;
 323     AVCodecContext *codec = st->codec;
 324     rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
 325
 326     /* loop on each attribute */
 327     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 328     {
 329         /* grab the codec extra_data from the config parameter of the fmtp line */
 330         sdp_parse_fmtp_config(codec, attr, value);
 331         /* Looking for a known attribute */
 332         for (i = 0; attr_names[i].str; ++i) {
 333             if (!strcasecmp(attr, attr_names[i].str)) {
 334                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 335                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 336                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 337                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 338             }
 339         }
 340     }
 341 }
 342
 343 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 344  *  and end time.
 345  *  Used for seeking in the rtp stream.
 346  */
 347 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 348 {
 349     char buf[256];
 350
 351     skip_spaces(&p);
 352     if (!av_stristart(p, "npt=", &p))
 353         return;
 354
 355     *start = AV_NOPTS_VALUE;
 356     *end = AV_NOPTS_VALUE;
 357
 358     get_word_sep(buf, sizeof(buf), "-", &p);
 359     *start = parse_date(buf, 1);
 360     if (*p == '-') {
 361         p++;
 362         get_word_sep(buf, sizeof(buf), "-", &p);
 363         *end = parse_date(buf, 1);
 364     }
 365 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 366 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 367 }
 368
 369 typedef struct SDPParseState {
 370     /* SDP only */
 371     struct in_addr default_ip;
 372     int default_ttl;
 373 } SDPParseState;
 374
 375 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 376                            int letter, const char *buf)
 377 {
 378     RTSPState *rt = s->priv_data;
 379     char buf1[64], st_type[64];
 380     const char *p;
 381     int codec_type, payload_type, i;
 382     AVStream *st;
 383     RTSPStream *rtsp_st;
 384     struct in_addr sdp_ip;
 385     int ttl;
 386
 387 #ifdef DEBUG
 388     printf("sdp: %c='%s'\n", letter, buf);
 389 #endif
 390
 391     p = buf;
 392     switch(letter) {
 393     case 'c':
 394         get_word(buf1, sizeof(buf1), &p);
 395         if (strcmp(buf1, "IN") != 0)
 396             return;
 397         get_word(buf1, sizeof(buf1), &p);
 398         if (strcmp(buf1, "IP4") != 0)
 399             return;
 400         get_word_sep(buf1, sizeof(buf1), "/", &p);
 401         if (inet_aton(buf1, &sdp_ip) == 0)
 402             return;
 403         ttl = 16;
 404         if (*p == '/') {
 405             p++;
 406             get_word_sep(buf1, sizeof(buf1), "/", &p);
 407             ttl = atoi(buf1);
 408         }
 409         if (s->nb_streams == 0) {
 410             s1->default_ip = sdp_ip;
 411             s1->default_ttl = ttl;
 412         } else {
 413             st = s->streams[s->nb_streams - 1];
 414             rtsp_st = st->priv_data;
 415             rtsp_st->sdp_ip = sdp_ip;
 416             rtsp_st->sdp_ttl = ttl;
 417         }
 418         break;
 419     case 's':
 420         av_strlcpy(s->title, p, sizeof(s->title));
 421         break;
 422     case 'i':
 423         if (s->nb_streams == 0) {
 424             av_strlcpy(s->comment, p, sizeof(s->comment));
 425             break;
 426         }
 427         break;
 428     case 'm':
 429         /* new stream */
 430         get_word(st_type, sizeof(st_type), &p);
 431         if (!strcmp(st_type, "audio")) {
 432             codec_type = CODEC_TYPE_AUDIO;
 433         } else if (!strcmp(st_type, "video")) {
 434             codec_type = CODEC_TYPE_VIDEO;
 435         } else {
 436             return;
 437         }
 438         rtsp_st = av_mallocz(sizeof(RTSPStream));
 439         if (!rtsp_st)
 440             return;
 441         rtsp_st->stream_index = -1;
 442         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 443
 444         rtsp_st->sdp_ip = s1->default_ip;
 445         rtsp_st->sdp_ttl = s1->default_ttl;
 446
 447         get_word(buf1, sizeof(buf1), &p); /* port */
 448         rtsp_st->sdp_port = atoi(buf1);
 449
 450         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 451
 452         /* XXX: handle list of formats */
 453         get_word(buf1, sizeof(buf1), &p); /* format list */
 454         rtsp_st->sdp_payload_type = atoi(buf1);
 455
 456         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 457             /* no corresponding stream */
 458         } else {
 459             st = av_new_stream(s, 0);
 460             if (!st)
 461                 return;
 462             st->priv_data = rtsp_st;
 463             rtsp_st->stream_index = st->index;
 464             st->codec->codec_type = codec_type;
 465             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 466                 /* if standard payload type, we can find the codec right now */
 467                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 468             }
 469         }
 470         /* put a default control url */
 471         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 472         break;
 473     case 'a':
 474         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 475             char proto[32];
 476             /* get the control url */
 477             st = s->streams[s->nb_streams - 1];
 478             rtsp_st = st->priv_data;
 479
 480             /* XXX: may need to add full url resolution */
 481             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 482             if (proto[0] == '\0') {
 483                 /* relative control URL */
 484                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 485                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 486             } else {
 487                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 488             }
 489         } else if (av_strstart(p, "rtpmap:", &p)) {
 490             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 491             get_word(buf1, sizeof(buf1), &p);
 492             payload_type = atoi(buf1);
 493             for(i = 0; i < s->nb_streams;i++) {
 494                 st = s->streams[i];
 495                 rtsp_st = st->priv_data;
 496                 if (rtsp_st->sdp_payload_type == payload_type) {
 497                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 498                 }
 499             }
 500         } else if (av_strstart(p, "fmtp:", &p)) {
 501             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' 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                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 509                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 510                             sdp_parse_fmtp(st, p);
 511                         }
 512                     } else {
 513                         sdp_parse_fmtp(st, p);
 514                     }
 515                 }
 516             }
 517         } else if(av_strstart(p, "framesize:", &p)) {
 518             // let dynamic protocol handlers have a stab at the line.
 519             get_word(buf1, sizeof(buf1), &p);
 520             payload_type = atoi(buf1);
 521             for(i = 0; i < s->nb_streams;i++) {
 522                 st = s->streams[i];
 523                 rtsp_st = st->priv_data;
 524                 if (rtsp_st->sdp_payload_type == payload_type) {
 525                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 526                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 527                     }
 528                 }
 529             }
 530         } else if(av_strstart(p, "range:", &p)) {
 531             int64_t start, end;
 532
 533             // this is so that seeking on a streamed file can work.
 534             rtsp_parse_range_npt(p, &start, &end);
 535             s->start_time= start;
 536             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 537         } else if (s->nb_streams > 0) {
 538             rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 539             if (rtsp_st->dynamic_handler &&
 540                 rtsp_st->dynamic_handler->parse_sdp_a_line)
 541                 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
 542                     rtsp_st->dynamic_protocol_context, buf);
 543         }
 544         break;
 545     }
 546 }
 547
 548 static int sdp_parse(AVFormatContext *s, const char *content)
 549 {
 550     const char *p;
 551     int letter;
 552     char buf[1024], *q;
 553     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 554
 555     memset(s1, 0, sizeof(SDPParseState));
 556     p = content;
 557     for(;;) {
 558         skip_spaces(&p);
 559         letter = *p;
 560         if (letter == '\0')
 561             break;
 562         p++;
 563         if (*p != '=')
 564             goto next_line;
 565         p++;
 566         /* get the content */
 567         q = buf;
 568         while (*p != '\n' && *p != '\r' && *p != '\0') {
 569             if ((q - buf) < sizeof(buf) - 1)
 570                 *q++ = *p;
 571             p++;
 572         }
 573         *q = '\0';
 574         sdp_parse_line(s, s1, letter, buf);
 575     next_line:
 576         while (*p != '\n' && *p != '\0')
 577             p++;
 578         if (*p == '\n')
 579             p++;
 580     }
 581     return 0;
 582 }
 583
 584 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 585 {
 586     const char *p;
 587     int v;
 588
 589     p = *pp;
 590     skip_spaces(&p);
 591     v = strtol(p, (char **)&p, 10);
 592     if (*p == '-') {
 593         p++;
 594         *min_ptr = v;
 595         v = strtol(p, (char **)&p, 10);
 596         *max_ptr = v;
 597     } else {
 598         *min_ptr = v;
 599         *max_ptr = v;
 600     }
 601     *pp = p;
 602 }
 603
 604 /* XXX: only one transport specification is parsed */
 605 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 606 {
 607     char transport_protocol[16];
 608     char profile[16];
 609     char lower_transport[16];
 610     char parameter[16];
 611     RTSPTransportField *th;
 612     char buf[256];
 613
 614     reply->nb_transports = 0;
 615
 616     for(;;) {
 617         skip_spaces(&p);
 618         if (*p == '\0')
 619             break;
 620
 621         th = &reply->transports[reply->nb_transports];
 622
 623         get_word_sep(transport_protocol, sizeof(transport_protocol),
 624                      "/", &p);
 625         if (*p == '/')
 626             p++;
 627         if (!strcasecmp (transport_protocol, "rtp")) {
 628             get_word_sep(profile, sizeof(profile), "/;,", &p);
 629             lower_transport[0] = '\0';
 630             /* rtp/avp/<protocol> */
 631             if (*p == '/') {
 632                 p++;
 633                 get_word_sep(lower_transport, sizeof(lower_transport),
 634                              ";,", &p);
 635                 }
 636         } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
 637             /* x-pn-tng/<protocol> */
 638             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 639             profile[0] = '\0';
 640         }
 641         if (!strcasecmp(lower_transport, "TCP"))
 642             th->protocol = RTSP_PROTOCOL_RTP_TCP;
 643         else
 644             th->protocol = RTSP_PROTOCOL_RTP_UDP;
 645
 646         if (*p == ';')
 647             p++;
 648         /* get each parameter */
 649         while (*p != '\0' && *p != ',') {
 650             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 651             if (!strcmp(parameter, "port")) {
 652                 if (*p == '=') {
 653                     p++;
 654                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 655                 }
 656             } else if (!strcmp(parameter, "client_port")) {
 657                 if (*p == '=') {
 658                     p++;
 659                     rtsp_parse_range(&th->client_port_min,
 660                                      &th->client_port_max, &p);
 661                 }
 662             } else if (!strcmp(parameter, "server_port")) {
 663                 if (*p == '=') {
 664                     p++;
 665                     rtsp_parse_range(&th->server_port_min,
 666                                      &th->server_port_max, &p);
 667                 }
 668             } else if (!strcmp(parameter, "interleaved")) {
 669                 if (*p == '=') {
 670                     p++;
 671                     rtsp_parse_range(&th->interleaved_min,
 672                                      &th->interleaved_max, &p);
 673                 }
 674             } else if (!strcmp(parameter, "multicast")) {
 675                 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
 676                     th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
 677             } else if (!strcmp(parameter, "ttl")) {
 678                 if (*p == '=') {
 679                     p++;
 680                     th->ttl = strtol(p, (char **)&p, 10);
 681                 }
 682             } else if (!strcmp(parameter, "destination")) {
 683                 struct in_addr ipaddr;
 684
 685                 if (*p == '=') {
 686                     p++;
 687                     get_word_sep(buf, sizeof(buf), ";,", &p);
 688                     if (inet_aton(buf, &ipaddr))
 689                         th->destination = ntohl(ipaddr.s_addr);
 690                 }
 691             }
 692             while (*p != ';' && *p != '\0' && *p != ',')
 693                 p++;
 694             if (*p == ';')
 695                 p++;
 696         }
 697         if (*p == ',')
 698             p++;
 699
 700         reply->nb_transports++;
 701     }
 702 }
 703
 704 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 705 {
 706     const char *p;
 707
 708     /* NOTE: we do case independent match for broken servers */
 709     p = buf;
 710     if (av_stristart(p, "Session:", &p)) {
 711         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 712     } else if (av_stristart(p, "Content-Length:", &p)) {
 713         reply->content_length = strtol(p, NULL, 10);
 714     } else if (av_stristart(p, "Transport:", &p)) {
 715         rtsp_parse_transport(reply, p);
 716     } else if (av_stristart(p, "CSeq:", &p)) {
 717         reply->seq = strtol(p, NULL, 10);
 718     } else if (av_stristart(p, "Range:", &p)) {
 719         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 720     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 721         skip_spaces(&p);
 722         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 723     }
 724 }
 725
 726 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 727 {
 728     int ret, len;
 729
 730     len = 0;
 731     while (len < size) {
 732         ret = url_read(h, buf+len, size-len);
 733         if (ret < 1)
 734             return ret;
 735         len += ret;
 736     }
 737     return len;
 738 }
 739
 740 /* skip a RTP/TCP interleaved packet */
 741 static void rtsp_skip_packet(AVFormatContext *s)
 742 {
 743     RTSPState *rt = s->priv_data;
 744     int ret, len, len1;
 745     uint8_t buf[1024];
 746
 747     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 748     if (ret != 3)
 749         return;
 750     len = AV_RB16(buf + 1);
 751 #ifdef DEBUG
 752     printf("skipping RTP packet len=%d\n", len);
 753 #endif
 754     /* skip payload */
 755     while (len > 0) {
 756         len1 = len;
 757         if (len1 > sizeof(buf))
 758             len1 = sizeof(buf);
 759         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 760         if (ret != len1)
 761             return;
 762         len -= len1;
 763     }
 764 }
 765
 766 static void rtsp_send_cmd(AVFormatContext *s,
 767                           const char *cmd, RTSPHeader *reply,
 768                           unsigned char **content_ptr)
 769 {
 770     RTSPState *rt = s->priv_data;
 771     char buf[4096], buf1[1024], *q;
 772     unsigned char ch;
 773     const char *p;
 774     int content_length, line_count;
 775     unsigned char *content = NULL;
 776
 777     memset(reply, 0, sizeof(RTSPHeader));
 778
 779     rt->seq++;
 780     av_strlcpy(buf, cmd, sizeof(buf));
 781     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 782     av_strlcat(buf, buf1, sizeof(buf));
 783     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 784         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 785         av_strlcat(buf, buf1, sizeof(buf));
 786     }
 787     av_strlcat(buf, "\r\n", sizeof(buf));
 788 #ifdef DEBUG
 789     printf("Sending:\n%s--\n", buf);
 790 #endif
 791     url_write(rt->rtsp_hd, buf, strlen(buf));
 792
 793     /* parse reply (XXX: use buffers) */
 794     line_count = 0;
 795     rt->last_reply[0] = '\0';
 796     for(;;) {
 797         q = buf;
 798         for(;;) {
 799             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 800                 break;
 801             if (ch == '\n')
 802                 break;
 803             if (ch == '$') {
 804                 /* XXX: only parse it if first char on line ? */
 805                 rtsp_skip_packet(s);
 806             } else if (ch != '\r') {
 807                 if ((q - buf) < sizeof(buf) - 1)
 808                     *q++ = ch;
 809             }
 810         }
 811         *q = '\0';
 812 #ifdef DEBUG
 813         printf("line='%s'\n", buf);
 814 #endif
 815         /* test if last line */
 816         if (buf[0] == '\0')
 817             break;
 818         p = buf;
 819         if (line_count == 0) {
 820             /* get reply code */
 821             get_word(buf1, sizeof(buf1), &p);
 822             get_word(buf1, sizeof(buf1), &p);
 823             reply->status_code = atoi(buf1);
 824         } else {
 825             rtsp_parse_line(reply, p);
 826             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 827             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 828         }
 829         line_count++;
 830     }
 831
 832     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 833         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 834
 835     content_length = reply->content_length;
 836     if (content_length > 0) {
 837         /* leave some room for a trailing '\0' (useful for simple parsing) */
 838         content = av_malloc(content_length + 1);
 839         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 840         content[content_length] = '\0';
 841     }
 842     if (content_ptr)
 843         *content_ptr = content;
 844     else
 845         av_free(content);
 846 }
 847
 848
 849 /* close and free RTSP streams */
 850 static void rtsp_close_streams(RTSPState *rt)
 851 {
 852     int i;
 853     RTSPStream *rtsp_st;
 854
 855     for(i=0;i<rt->nb_rtsp_streams;i++) {
 856         rtsp_st = rt->rtsp_streams[i];
 857         if (rtsp_st) {
 858             if (rtsp_st->rtp_ctx)
 859                 rtp_parse_close(rtsp_st->rtp_ctx);
 860             if (rtsp_st->rtp_handle)
 861                 url_close(rtsp_st->rtp_handle);
 862             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 863                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 864         }
 865     }
 866     av_free(rt->rtsp_streams);
 867 }
 868
 869 /**
 870  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 871  */
 872 static int
 873 make_setup_request (AVFormatContext *s, const char *host, int port, int protocol)
 874 {
 875     RTSPState *rt = s->priv_data;
 876     int j, i, err;
 877     RTSPStream *rtsp_st;
 878     AVStream *st;
 879     RTSPHeader reply1, *reply = &reply1;
 880     char cmd[2048];
 881
 882     /* for each stream, make the setup request */
 883     /* XXX: we assume the same server is used for the control of each
 884        RTSP stream */
 885
 886     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 887         char transport[2048];
 888
 889         rtsp_st = rt->rtsp_streams[i];
 890
 891         /* compute available transports */
 892         transport[0] = '\0';
 893
 894         /* RTP/UDP */
 895         if (protocol == RTSP_PROTOCOL_RTP_UDP) {
 896             char buf[256];
 897
 898             /* first try in specified port range */
 899             if (RTSP_RTP_PORT_MIN != 0) {
 900                 while(j <= RTSP_RTP_PORT_MAX) {
 901                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 902                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 903                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 904                         goto rtp_opened;
 905                     }
 906                 }
 907             }
 908
 909 /*            then try on any port
 910 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 911 **                err = AVERROR_INVALIDDATA;
 912 **                goto fail;
 913 **            }
 914 */
 915
 916         rtp_opened:
 917             port = rtp_get_local_port(rtsp_st->rtp_handle);
 918             if (transport[0] != '\0')
 919                 av_strlcat(transport, ",", sizeof(transport));
 920             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 921                      "RTP/AVP/UDP;unicast;client_port=%d-%d",
 922                      port, port + 1);
 923         }
 924
 925         /* RTP/TCP */
 926         else if (protocol == RTSP_PROTOCOL_RTP_TCP) {
 927             if (transport[0] != '\0')
 928                 av_strlcat(transport, ",", sizeof(transport));
 929             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 930                      "RTP/AVP/TCP");
 931         }
 932
 933         else if (protocol == RTSP_PROTOCOL_RTP_UDP_MULTICAST) {
 934             if (transport[0] != '\0')
 935                 av_strlcat(transport, ",", sizeof(transport));
 936             snprintf(transport + strlen(transport),
 937                      sizeof(transport) - strlen(transport) - 1,
 938                      "RTP/AVP/UDP;multicast");
 939         }
 940         snprintf(cmd, sizeof(cmd),
 941                  "SETUP %s RTSP/1.0\r\n"
 942                  "Transport: %s\r\n",
 943                  rtsp_st->control_url, transport);
 944         rtsp_send_cmd(s, cmd, reply, NULL);
 945         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
 946             err = 1;
 947             goto fail;
 948         } else if (reply->status_code != RTSP_STATUS_OK ||
 949                    reply->nb_transports != 1) {
 950             err = AVERROR_INVALIDDATA;
 951             goto fail;
 952         }
 953
 954         /* XXX: same protocol for all streams is required */
 955         if (i > 0) {
 956             if (reply->transports[0].protocol != rt->protocol) {
 957                 err = AVERROR_INVALIDDATA;
 958                 goto fail;
 959             }
 960         } else {
 961             rt->protocol = reply->transports[0].protocol;
 962         }
 963
 964         /* close RTP connection if not choosen */
 965         if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
 966             (protocol == RTSP_PROTOCOL_RTP_UDP)) {
 967             url_close(rtsp_st->rtp_handle);
 968             rtsp_st->rtp_handle = NULL;
 969         }
 970
 971         switch(reply->transports[0].protocol) {
 972         case RTSP_PROTOCOL_RTP_TCP:
 973             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
 974             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
 975             break;
 976
 977         case RTSP_PROTOCOL_RTP_UDP:
 978             {
 979                 char url[1024];
 980
 981                 /* XXX: also use address if specified */
 982                 snprintf(url, sizeof(url), "rtp://%s:%d",
 983                          host, reply->transports[0].server_port_min);
 984                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
 985                     err = AVERROR_INVALIDDATA;
 986                     goto fail;
 987                 }
 988             }
 989             break;
 990         case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
 991             {
 992                 char url[1024];
 993                 struct in_addr in;
 994
 995                 in.s_addr = htonl(reply->transports[0].destination);
 996                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
 997                          inet_ntoa(in),
 998                          reply->transports[0].port_min,
 999                          reply->transports[0].ttl);
1000                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1001                     err = AVERROR_INVALIDDATA;
1002                     goto fail;
1003                 }
1004             }
1005             break;
1006         }
1007         /* open the RTP context */
1008         st = NULL;
1009         if (rtsp_st->stream_index >= 0)
1010             st = s->streams[rtsp_st->stream_index];
1011         if (!st)
1012             s->ctx_flags |= AVFMTCTX_NOHEADER;
1013         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1014
1015         if (!rtsp_st->rtp_ctx) {
1016             err = AVERROR(ENOMEM);
1017             goto fail;
1018         } else {
1019             if(rtsp_st->dynamic_handler) {
1020                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1021                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1022             }
1023         }
1024     }
1025
1026     return 0;
1027
1028 fail:
1029     for (i=0; i<rt->nb_rtsp_streams; i++) {
1030         if (rt->rtsp_streams[i]->rtp_handle) {
1031             url_close(rt->rtsp_streams[i]->rtp_handle);
1032             rt->rtsp_streams[i]->rtp_handle = NULL;
1033         }
1034     }
1035     return err;
1036 }
1037
1038 static int rtsp_read_header(AVFormatContext *s,
1039                             AVFormatParameters *ap)
1040 {
1041     RTSPState *rt = s->priv_data;
1042     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1043     URLContext *rtsp_hd;
1044     int port, ret, err;
1045     RTSPHeader reply1, *reply = &reply1;
1046     unsigned char *content = NULL;
1047     int protocol_mask = 0;
1048     char real_challenge[64];
1049
1050     /* extract hostname and port */
1051     url_split(NULL, 0, NULL, 0,
1052               host, sizeof(host), &port, path, sizeof(path), s->filename);
1053     if (port < 0)
1054         port = RTSP_DEFAULT_PORT;
1055
1056     /* search for options */
1057     option_list = strchr(path, '?');
1058     if (option_list) {
1059         /* remove the options from the path */
1060         *option_list++ = 0;
1061         while(option_list) {
1062             /* move the option pointer */
1063             option = option_list;
1064             option_list = strchr(option_list, '&');
1065             if (option_list)
1066                 *(option_list++) = 0;
1067             /* handle the options */
1068             if (strcmp(option, "udp") == 0)
1069                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
1070             else if (strcmp(option, "multicast") == 0)
1071                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
1072             else if (strcmp(option, "tcp") == 0)
1073                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
1074         }
1075     }
1076
1077     if (!protocol_mask)
1078         protocol_mask = (1 << RTSP_PROTOCOL_RTP_LAST) - 1;
1079
1080     /* open the tcp connexion */
1081     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1082     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1083         return AVERROR(EIO);
1084     rt->rtsp_hd = rtsp_hd;
1085     rt->seq = 0;
1086
1087     /* request options supported by the server; this also detects server type */
1088     for (rt->server_type = RTSP_SERVER_RTP;;) {
1089         snprintf(cmd, sizeof(cmd),
1090                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1091         if (rt->server_type == RTSP_SERVER_RDT)
1092             av_strlcat(cmd,
1093                        /**
1094                         * The following entries are required for proper
1095                         * streaming from a Realmedia server. They are
1096                         * interdependent in some way although we currently
1097                         * don't quite understand how. Values were copied
1098                         * from mplayer SVN r23589.
1099                         * @param CompanyID is a 16-byte ID in base64
1100                         * @param ClientChallenge is a 16-byte ID in hex
1101                         */
1102                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1103                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1104                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1105                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1106                        sizeof(cmd));
1107         rtsp_send_cmd(s, cmd, reply, NULL);
1108         if (reply->status_code != RTSP_STATUS_OK) {
1109             err = AVERROR_INVALIDDATA;
1110             goto fail;
1111         }
1112
1113         /* detect server type if not standard-compliant RTP */
1114         if (rt->server_type != RTSP_SERVER_RDT && reply->real_challenge[0]) {
1115             rt->server_type = RTSP_SERVER_RDT;
1116             continue;
1117         } else if (rt->server_type == RTSP_SERVER_RDT) {
1118             strcpy(real_challenge, reply->real_challenge);
1119         }
1120         break;
1121     }
1122
1123     /* describe the stream */
1124     snprintf(cmd, sizeof(cmd),
1125              "DESCRIBE %s RTSP/1.0\r\n"
1126              "Accept: application/sdp\r\n",
1127              s->filename);
1128     rtsp_send_cmd(s, cmd, reply, &content);
1129     if (!content) {
1130         err = AVERROR_INVALIDDATA;
1131         goto fail;
1132     }
1133     if (reply->status_code != RTSP_STATUS_OK) {
1134         err = AVERROR_INVALIDDATA;
1135         goto fail;
1136     }
1137
1138     /* now we got the SDP description, we parse it */
1139     ret = sdp_parse(s, (const char *)content);
1140     av_freep(&content);
1141     if (ret < 0) {
1142         err = AVERROR_INVALIDDATA;
1143         goto fail;
1144     }
1145
1146     do {
1147         int protocol = ff_log2_tab[protocol_mask & ~(protocol_mask - 1)];
1148
1149         err = make_setup_request(s, host, port, protocol);
1150         if (err < 0)
1151             goto fail;
1152         protocol_mask &= ~(1 << protocol);
1153         if (protocol_mask == 0 && err == 1) {
1154             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1155             goto fail;
1156         }
1157     } while (err);
1158
1159     rt->state = RTSP_STATE_IDLE;
1160     rt->seek_timestamp = 0; /* default is to start stream at position
1161                                zero */
1162     if (ap->initial_pause) {
1163         /* do not start immediately */
1164     } else {
1165         if (rtsp_read_play(s) < 0) {
1166             err = AVERROR_INVALIDDATA;
1167             goto fail;
1168         }
1169     }
1170     return 0;
1171  fail:
1172     rtsp_close_streams(rt);
1173     av_freep(&content);
1174     url_close(rt->rtsp_hd);
1175     return err;
1176 }
1177
1178 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1179                            uint8_t *buf, int buf_size)
1180 {
1181     RTSPState *rt = s->priv_data;
1182     int id, len, i, ret;
1183     RTSPStream *rtsp_st;
1184
1185 #ifdef DEBUG_RTP_TCP
1186     printf("tcp_read_packet:\n");
1187 #endif
1188  redo:
1189     for(;;) {
1190         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1191 #ifdef DEBUG_RTP_TCP
1192         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1193 #endif
1194         if (ret != 1)
1195             return -1;
1196         if (buf[0] == '$')
1197             break;
1198     }
1199     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1200     if (ret != 3)
1201         return -1;
1202     id = buf[0];
1203     len = AV_RB16(buf + 1);
1204 #ifdef DEBUG_RTP_TCP
1205     printf("id=%d len=%d\n", id, len);
1206 #endif
1207     if (len > buf_size || len < 12)
1208         goto redo;
1209     /* get the data */
1210     ret = url_readbuf(rt->rtsp_hd, buf, len);
1211     if (ret != len)
1212         return -1;
1213
1214     /* find the matching stream */
1215     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1216         rtsp_st = rt->rtsp_streams[i];
1217         if (id >= rtsp_st->interleaved_min &&
1218             id <= rtsp_st->interleaved_max)
1219             goto found;
1220     }
1221     goto redo;
1222  found:
1223     *prtsp_st = rtsp_st;
1224     return len;
1225 }
1226
1227 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1228                            uint8_t *buf, int buf_size)
1229 {
1230     RTSPState *rt = s->priv_data;
1231     RTSPStream *rtsp_st;
1232     fd_set rfds;
1233     int fd1, fd2, fd_max, n, i, ret;
1234     struct timeval tv;
1235
1236     for(;;) {
1237         if (url_interrupt_cb())
1238             return AVERROR(EINTR);
1239         FD_ZERO(&rfds);
1240         fd_max = -1;
1241         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1242             rtsp_st = rt->rtsp_streams[i];
1243             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1244             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1245             if (fd1 > fd_max)
1246                 fd_max = fd1;
1247             FD_SET(fd1, &rfds);
1248         }
1249         tv.tv_sec = 0;
1250         tv.tv_usec = 100 * 1000;
1251         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1252         if (n > 0) {
1253             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1254                 rtsp_st = rt->rtsp_streams[i];
1255                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1256                 if (FD_ISSET(fd1, &rfds)) {
1257                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1258                     if (ret > 0) {
1259                         *prtsp_st = rtsp_st;
1260                         return ret;
1261                     }
1262                 }
1263             }
1264         }
1265     }
1266 }
1267
1268 static int rtsp_read_packet(AVFormatContext *s,
1269                             AVPacket *pkt)
1270 {
1271     RTSPState *rt = s->priv_data;
1272     RTSPStream *rtsp_st;
1273     int ret, len;
1274     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1275
1276     /* get next frames from the same RTP packet */
1277     if (rt->cur_rtp) {
1278         ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1279         if (ret == 0) {
1280             rt->cur_rtp = NULL;
1281             return 0;
1282         } else if (ret == 1) {
1283             return 0;
1284         } else {
1285             rt->cur_rtp = NULL;
1286         }
1287     }
1288
1289     /* read next RTP packet */
1290  redo:
1291     switch(rt->protocol) {
1292     default:
1293     case RTSP_PROTOCOL_RTP_TCP:
1294         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1295         break;
1296     case RTSP_PROTOCOL_RTP_UDP:
1297     case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1298         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1299         if (len >=0 && rtsp_st->rtp_ctx)
1300             rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1301         break;
1302     }
1303     if (len < 0)
1304         return len;
1305     ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1306     if (ret < 0)
1307         goto redo;
1308     if (ret == 1) {
1309         /* more packets may follow, so we save the RTP context */
1310         rt->cur_rtp = rtsp_st->rtp_ctx;
1311     }
1312     return 0;
1313 }
1314
1315 static int rtsp_read_play(AVFormatContext *s)
1316 {
1317     RTSPState *rt = s->priv_data;
1318     RTSPHeader reply1, *reply = &reply1;
1319     char cmd[1024];
1320
1321     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1322
1323     if (rt->state == RTSP_STATE_PAUSED) {
1324         snprintf(cmd, sizeof(cmd),
1325                  "PLAY %s RTSP/1.0\r\n",
1326                  s->filename);
1327     } else {
1328         snprintf(cmd, sizeof(cmd),
1329                  "PLAY %s RTSP/1.0\r\n"
1330                  "Range: npt=%0.3f-\r\n",
1331                  s->filename,
1332                  (double)rt->seek_timestamp / AV_TIME_BASE);
1333     }
1334     rtsp_send_cmd(s, cmd, reply, NULL);
1335     if (reply->status_code != RTSP_STATUS_OK) {
1336         return -1;
1337     } else {
1338         rt->state = RTSP_STATE_PLAYING;
1339         return 0;
1340     }
1341 }
1342
1343 /* pause the stream */
1344 static int rtsp_read_pause(AVFormatContext *s)
1345 {
1346     RTSPState *rt = s->priv_data;
1347     RTSPHeader reply1, *reply = &reply1;
1348     char cmd[1024];
1349
1350     rt = s->priv_data;
1351
1352     if (rt->state != RTSP_STATE_PLAYING)
1353         return 0;
1354
1355     snprintf(cmd, sizeof(cmd),
1356              "PAUSE %s RTSP/1.0\r\n",
1357              s->filename);
1358     rtsp_send_cmd(s, cmd, reply, NULL);
1359     if (reply->status_code != RTSP_STATUS_OK) {
1360         return -1;
1361     } else {
1362         rt->state = RTSP_STATE_PAUSED;
1363         return 0;
1364     }
1365 }
1366
1367 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1368                           int64_t timestamp, int flags)
1369 {
1370     RTSPState *rt = s->priv_data;
1371
1372     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1373     switch(rt->state) {
1374     default:
1375     case RTSP_STATE_IDLE:
1376         break;
1377     case RTSP_STATE_PLAYING:
1378         if (rtsp_read_play(s) != 0)
1379             return -1;
1380         break;
1381     case RTSP_STATE_PAUSED:
1382         rt->state = RTSP_STATE_IDLE;
1383         break;
1384     }
1385     return 0;
1386 }
1387
1388 static int rtsp_read_close(AVFormatContext *s)
1389 {
1390     RTSPState *rt = s->priv_data;
1391     RTSPHeader reply1, *reply = &reply1;
1392     char cmd[1024];
1393
1394 #if 0
1395     /* NOTE: it is valid to flush the buffer here */
1396     if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1397         url_fclose(&rt->rtsp_gb);
1398     }
1399 #endif
1400     snprintf(cmd, sizeof(cmd),
1401              "TEARDOWN %s RTSP/1.0\r\n",
1402              s->filename);
1403     rtsp_send_cmd(s, cmd, reply, NULL);
1404
1405     rtsp_close_streams(rt);
1406     url_close(rt->rtsp_hd);
1407     return 0;
1408 }
1409
1410 #ifdef CONFIG_RTSP_DEMUXER
1411 AVInputFormat rtsp_demuxer = {
1412     "rtsp",
1413     NULL_IF_CONFIG_SMALL("RTSP input format"),
1414     sizeof(RTSPState),
1415     rtsp_probe,
1416     rtsp_read_header,
1417     rtsp_read_packet,
1418     rtsp_read_close,
1419     rtsp_read_seek,
1420     .flags = AVFMT_NOFILE,
1421     .read_play = rtsp_read_play,
1422     .read_pause = rtsp_read_pause,
1423 };
1424 #endif
1425
1426 static int sdp_probe(AVProbeData *p1)
1427 {
1428     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1429
1430     /* we look for a line beginning "c=IN IP4" */
1431     while (p < p_end && *p != '\0') {
1432         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1433             return AVPROBE_SCORE_MAX / 2;
1434
1435         while(p < p_end - 1 && *p != '\n') p++;
1436         if (++p >= p_end)
1437             break;
1438         if (*p == '\r')
1439             p++;
1440     }
1441     return 0;
1442 }
1443
1444 #define SDP_MAX_SIZE 8192
1445
1446 static int sdp_read_header(AVFormatContext *s,
1447                            AVFormatParameters *ap)
1448 {
1449     RTSPState *rt = s->priv_data;
1450     RTSPStream *rtsp_st;
1451     int size, i, err;
1452     char *content;
1453     char url[1024];
1454     AVStream *st;
1455
1456     /* read the whole sdp file */
1457     /* XXX: better loading */
1458     content = av_malloc(SDP_MAX_SIZE);
1459     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1460     if (size <= 0) {
1461         av_free(content);
1462         return AVERROR_INVALIDDATA;
1463     }
1464     content[size] ='\0';
1465
1466     sdp_parse(s, content);
1467     av_free(content);
1468
1469     /* open each RTP stream */
1470     for(i=0;i<rt->nb_rtsp_streams;i++) {
1471         rtsp_st = rt->rtsp_streams[i];
1472
1473         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1474                  inet_ntoa(rtsp_st->sdp_ip),
1475                  rtsp_st->sdp_port,
1476                  rtsp_st->sdp_port,
1477                  rtsp_st->sdp_ttl);
1478         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1479             err = AVERROR_INVALIDDATA;
1480             goto fail;
1481         }
1482         /* open the RTP context */
1483         st = NULL;
1484         if (rtsp_st->stream_index >= 0)
1485             st = s->streams[rtsp_st->stream_index];
1486         if (!st)
1487             s->ctx_flags |= AVFMTCTX_NOHEADER;
1488         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1489         if (!rtsp_st->rtp_ctx) {
1490             err = AVERROR(ENOMEM);
1491             goto fail;
1492         } else {
1493             if(rtsp_st->dynamic_handler) {
1494                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1495                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1496             }
1497         }
1498     }
1499     return 0;
1500  fail:
1501     rtsp_close_streams(rt);
1502     return err;
1503 }
1504
1505 static int sdp_read_packet(AVFormatContext *s,
1506                             AVPacket *pkt)
1507 {
1508     return rtsp_read_packet(s, pkt);
1509 }
1510
1511 static int sdp_read_close(AVFormatContext *s)
1512 {
1513     RTSPState *rt = s->priv_data;
1514     rtsp_close_streams(rt);
1515     return 0;
1516 }
1517
1518 #ifdef CONFIG_SDP_DEMUXER
1519 AVInputFormat sdp_demuxer = {
1520     "sdp",
1521     NULL_IF_CONFIG_SMALL("SDP"),
1522     sizeof(RTSPState),
1523     sdp_probe,
1524     sdp_read_header,
1525     sdp_read_packet,
1526     sdp_read_close,
1527 };
1528 #endif
1529
1530 #ifdef CONFIG_REDIR_DEMUXER
1531 /* dummy redirector format (used directly in av_open_input_file now) */
1532 static int redir_probe(AVProbeData *pd)
1533 {
1534     const char *p;
1535     p = pd->buf;
1536     while (redir_isspace(*p))
1537         p++;
1538     if (av_strstart(p, "http://", NULL) ||
1539         av_strstart(p, "rtsp://", NULL))
1540         return AVPROBE_SCORE_MAX;
1541     return 0;
1542 }
1543
1544 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1545 {
1546     char buf[4096], *q;
1547     int c;
1548     AVFormatContext *ic = NULL;
1549     ByteIOContext *f = s->pb;
1550
1551     /* parse each URL and try to open it */
1552     c = url_fgetc(f);
1553     while (c != URL_EOF) {
1554         /* skip spaces */
1555         for(;;) {
1556             if (!redir_isspace(c))
1557                 break;
1558             c = url_fgetc(f);
1559         }
1560         if (c == URL_EOF)
1561             break;
1562         /* record url */
1563         q = buf;
1564         for(;;) {
1565             if (c == URL_EOF || redir_isspace(c))
1566                 break;
1567             if ((q - buf) < sizeof(buf) - 1)
1568                 *q++ = c;
1569             c = url_fgetc(f);
1570         }
1571         *q = '\0';
1572         //printf("URL='%s'\n", buf);
1573         /* try to open the media file */
1574         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1575             break;
1576     }
1577     if (!ic)
1578         return AVERROR(EIO);
1579
1580     *s = *ic;
1581     url_fclose(f);
1582
1583     return 0;
1584 }
1585
1586 AVInputFormat redir_demuxer = {
1587     "redir",
1588     NULL_IF_CONFIG_SMALL("Redirector format"),
1589     0,
1590     redir_probe,
1591     redir_read_header,
1592     NULL,
1593     NULL,
1594 };
1595 #endif