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 #include "libavutil/avstring.h"
  23 #include "avformat.h"
  24
  25 #include <sys/time.h>
  26 #include <unistd.h> /* for select() prototype */
  27 #include "network.h"
  28 #include "rtsp.h"
  29
  30 #include "rtp_internal.h"
  31
  32 //#define DEBUG
  33 //#define DEBUG_RTP_TCP
  34
  35 enum RTSPClientState {
  36     RTSP_STATE_IDLE,
  37     RTSP_STATE_PLAYING,
  38     RTSP_STATE_PAUSED,
  39 };
  40
  41 typedef struct RTSPState {
  42     URLContext *rtsp_hd; /* RTSP TCP connexion handle */
  43     int nb_rtsp_streams;
  44     struct RTSPStream **rtsp_streams;
  45
  46     enum RTSPClientState state;
  47     int64_t seek_timestamp;
  48
  49     /* XXX: currently we use unbuffered input */
  50     //    ByteIOContext rtsp_gb;
  51     int seq;        /* RTSP command sequence number */
  52     char session_id[512];
  53     enum RTSPProtocol protocol;
  54     char last_reply[2048]; /* XXX: allocate ? */
  55     RTPDemuxContext *cur_rtp;
  56 } RTSPState;
  57
  58 typedef struct RTSPStream {
  59     URLContext *rtp_handle; /* RTP stream handle */
  60     RTPDemuxContext *rtp_ctx; /* RTP parse context */
  61
  62     int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
  63     int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
  64     char control_url[1024]; /* url for this stream (from SDP) */
  65
  66     int sdp_port; /* port (from SDP content - not used in RTSP) */
  67     struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
  68     int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
  69     int sdp_payload_type; /* payload type - only used in SDP */
  70     rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
  71
  72     RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
  73     void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
  74 } RTSPStream;
  75
  76 static int rtsp_read_play(AVFormatContext *s);
  77
  78 /* XXX: currently, the only way to change the protocols consists in
  79    changing this variable */
  80
  81 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  82 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
  83 #endif
  84
  85 static int rtsp_probe(AVProbeData *p)
  86 {
  87     if (av_strstart(p->filename, "rtsp:", NULL))
  88         return AVPROBE_SCORE_MAX;
  89     return 0;
  90 }
  91
  92 static int redir_isspace(int c)
  93 {
  94     return c == ' ' || c == '\t' || c == '\n' || c == '\r';
  95 }
  96
  97 static void skip_spaces(const char **pp)
  98 {
  99     const char *p;
 100     p = *pp;
 101     while (redir_isspace(*p))
 102         p++;
 103     *pp = p;
 104 }
 105
 106 static void get_word_sep(char *buf, int buf_size, const char *sep,
 107                          const char **pp)
 108 {
 109     const char *p;
 110     char *q;
 111
 112     p = *pp;
 113     if (*p == '/')
 114         p++;
 115     skip_spaces(&p);
 116     q = buf;
 117     while (!strchr(sep, *p) && *p != '\0') {
 118         if ((q - buf) < buf_size - 1)
 119             *q++ = *p;
 120         p++;
 121     }
 122     if (buf_size > 0)
 123         *q = '\0';
 124     *pp = p;
 125 }
 126
 127 static void get_word(char *buf, int buf_size, const char **pp)
 128 {
 129     const char *p;
 130     char *q;
 131
 132     p = *pp;
 133     skip_spaces(&p);
 134     q = buf;
 135     while (!redir_isspace(*p) && *p != '\0') {
 136         if ((q - buf) < buf_size - 1)
 137             *q++ = *p;
 138         p++;
 139     }
 140     if (buf_size > 0)
 141         *q = '\0';
 142     *pp = p;
 143 }
 144
 145 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 146    params>] */
 147 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 148 {
 149     char buf[256];
 150     int i;
 151     AVCodec *c;
 152     const char *c_name;
 153
 154     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 155        see if we can handle this kind of payload */
 156     get_word_sep(buf, sizeof(buf), "/", &p);
 157     if (payload_type >= RTP_PT_PRIVATE) {
 158         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 159         while(handler) {
 160             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 161                 codec->codec_id = handler->codec_id;
 162                 rtsp_st->dynamic_handler= handler;
 163                 if(handler->open) {
 164                     rtsp_st->dynamic_protocol_context= handler->open();
 165                 }
 166                 break;
 167             }
 168             handler= handler->next;
 169         }
 170     } else {
 171         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 172         /* search into AVRtpPayloadTypes[] */
 173         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 174     }
 175
 176     c = avcodec_find_decoder(codec->codec_id);
 177     if (c && c->name)
 178         c_name = c->name;
 179     else
 180         c_name = (char *)NULL;
 181
 182     if (c_name) {
 183         get_word_sep(buf, sizeof(buf), "/", &p);
 184         i = atoi(buf);
 185         switch (codec->codec_type) {
 186             case CODEC_TYPE_AUDIO:
 187                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 188                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 189                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 190                 if (i > 0) {
 191                     codec->sample_rate = i;
 192                     get_word_sep(buf, sizeof(buf), "/", &p);
 193                     i = atoi(buf);
 194                     if (i > 0)
 195                         codec->channels = i;
 196                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 197                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 198                 }
 199                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 200                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 201                 break;
 202             case CODEC_TYPE_VIDEO:
 203                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 204                 break;
 205             default:
 206                 break;
 207         }
 208         return 0;
 209     }
 210
 211     return -1;
 212 }
 213
 214 /* return the length and optionnaly the data */
 215 static int hex_to_data(uint8_t *data, const char *p)
 216 {
 217     int c, len, v;
 218
 219     len = 0;
 220     v = 1;
 221     for(;;) {
 222         skip_spaces(&p);
 223         if (p == '\0')
 224             break;
 225         c = toupper((unsigned char)*p++);
 226         if (c >= '0' && c <= '9')
 227             c = c - '0';
 228         else if (c >= 'A' && c <= 'F')
 229             c = c - 'A' + 10;
 230         else
 231             break;
 232         v = (v << 4) | c;
 233         if (v & 0x100) {
 234             if (data)
 235                 data[len] = v;
 236             len++;
 237             v = 1;
 238         }
 239     }
 240     return len;
 241 }
 242
 243 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 244 {
 245     switch (codec->codec_id) {
 246         case CODEC_ID_MPEG4:
 247         case CODEC_ID_AAC:
 248             if (!strcmp(attr, "config")) {
 249                 /* decode the hexa encoded parameter */
 250                 int len = hex_to_data(NULL, value);
 251                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 252                 if (!codec->extradata)
 253                     return;
 254                 codec->extradata_size = len;
 255                 hex_to_data(codec->extradata, value);
 256             }
 257             break;
 258         default:
 259             break;
 260     }
 261     return;
 262 }
 263
 264 typedef struct attrname_map
 265 {
 266     const char *str;
 267     uint16_t type;
 268     uint32_t offset;
 269 } attrname_map_t;
 270
 271 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 272 #define ATTR_NAME_TYPE_INT 0
 273 #define ATTR_NAME_TYPE_STR 1
 274 static attrname_map_t attr_names[]=
 275 {
 276     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
 277     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
 278     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
 279     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
 280     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
 281     {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
 282     {NULL, -1, -1},
 283 };
 284
 285 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 286 * because it is used in rtp_h264.c, which is forthcoming.
 287 */
 288 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 289 {
 290     skip_spaces(p);
 291     if(**p)
 292     {
 293         get_word_sep(attr, attr_size, "=", p);
 294         if (**p == '=')
 295             (*p)++;
 296         get_word_sep(value, value_size, ";", p);
 297         if (**p == ';')
 298             (*p)++;
 299         return 1;
 300     }
 301     return 0;
 302 }
 303
 304 /* parse a SDP line and save stream attributes */
 305 static void sdp_parse_fmtp(AVStream *st, const char *p)
 306 {
 307     char attr[256];
 308     char value[4096];
 309     int i;
 310
 311     RTSPStream *rtsp_st = st->priv_data;
 312     AVCodecContext *codec = st->codec;
 313     rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
 314
 315     /* loop on each attribute */
 316     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 317     {
 318         /* grab the codec extra_data from the config parameter of the fmtp line */
 319         sdp_parse_fmtp_config(codec, attr, value);
 320         /* Looking for a known attribute */
 321         for (i = 0; attr_names[i].str; ++i) {
 322             if (!strcasecmp(attr, attr_names[i].str)) {
 323                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 324                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 325                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 326                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 327             }
 328         }
 329     }
 330 }
 331
 332 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 333  *  and end time.
 334  *  Used for seeking in the rtp stream.
 335  */
 336 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 337 {
 338     char buf[256];
 339
 340     skip_spaces(&p);
 341     if (!av_stristart(p, "npt=", &p))
 342         return;
 343
 344     *start = AV_NOPTS_VALUE;
 345     *end = AV_NOPTS_VALUE;
 346
 347     get_word_sep(buf, sizeof(buf), "-", &p);
 348     *start = parse_date(buf, 1);
 349     if (*p == '-') {
 350         p++;
 351         get_word_sep(buf, sizeof(buf), "-", &p);
 352         *end = parse_date(buf, 1);
 353     }
 354 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 355 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 356 }
 357
 358 typedef struct SDPParseState {
 359     /* SDP only */
 360     struct in_addr default_ip;
 361     int default_ttl;
 362 } SDPParseState;
 363
 364 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 365                            int letter, const char *buf)
 366 {
 367     RTSPState *rt = s->priv_data;
 368     char buf1[64], st_type[64];
 369     const char *p;
 370     int codec_type, payload_type, i;
 371     AVStream *st;
 372     RTSPStream *rtsp_st;
 373     struct in_addr sdp_ip;
 374     int ttl;
 375
 376 #ifdef DEBUG
 377     printf("sdp: %c='%s'\n", letter, buf);
 378 #endif
 379
 380     p = buf;
 381     switch(letter) {
 382     case 'c':
 383         get_word(buf1, sizeof(buf1), &p);
 384         if (strcmp(buf1, "IN") != 0)
 385             return;
 386         get_word(buf1, sizeof(buf1), &p);
 387         if (strcmp(buf1, "IP4") != 0)
 388             return;
 389         get_word_sep(buf1, sizeof(buf1), "/", &p);
 390         if (inet_aton(buf1, &sdp_ip) == 0)
 391             return;
 392         ttl = 16;
 393         if (*p == '/') {
 394             p++;
 395             get_word_sep(buf1, sizeof(buf1), "/", &p);
 396             ttl = atoi(buf1);
 397         }
 398         if (s->nb_streams == 0) {
 399             s1->default_ip = sdp_ip;
 400             s1->default_ttl = ttl;
 401         } else {
 402             st = s->streams[s->nb_streams - 1];
 403             rtsp_st = st->priv_data;
 404             rtsp_st->sdp_ip = sdp_ip;
 405             rtsp_st->sdp_ttl = ttl;
 406         }
 407         break;
 408     case 's':
 409         av_strlcpy(s->title, p, sizeof(s->title));
 410         break;
 411     case 'i':
 412         if (s->nb_streams == 0) {
 413             av_strlcpy(s->comment, p, sizeof(s->comment));
 414             break;
 415         }
 416         break;
 417     case 'm':
 418         /* new stream */
 419         get_word(st_type, sizeof(st_type), &p);
 420         if (!strcmp(st_type, "audio")) {
 421             codec_type = CODEC_TYPE_AUDIO;
 422         } else if (!strcmp(st_type, "video")) {
 423             codec_type = CODEC_TYPE_VIDEO;
 424         } else {
 425             return;
 426         }
 427         rtsp_st = av_mallocz(sizeof(RTSPStream));
 428         if (!rtsp_st)
 429             return;
 430         rtsp_st->stream_index = -1;
 431         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 432
 433         rtsp_st->sdp_ip = s1->default_ip;
 434         rtsp_st->sdp_ttl = s1->default_ttl;
 435
 436         get_word(buf1, sizeof(buf1), &p); /* port */
 437         rtsp_st->sdp_port = atoi(buf1);
 438
 439         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 440
 441         /* XXX: handle list of formats */
 442         get_word(buf1, sizeof(buf1), &p); /* format list */
 443         rtsp_st->sdp_payload_type = atoi(buf1);
 444
 445         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 446             /* no corresponding stream */
 447         } else {
 448             st = av_new_stream(s, 0);
 449             if (!st)
 450                 return;
 451             st->priv_data = rtsp_st;
 452             rtsp_st->stream_index = st->index;
 453             st->codec->codec_type = codec_type;
 454             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 455                 /* if standard payload type, we can find the codec right now */
 456                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 457             }
 458         }
 459         /* put a default control url */
 460         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 461         break;
 462     case 'a':
 463         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 464             char proto[32];
 465             /* get the control url */
 466             st = s->streams[s->nb_streams - 1];
 467             rtsp_st = st->priv_data;
 468
 469             /* XXX: may need to add full url resolution */
 470             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 471             if (proto[0] == '\0') {
 472                 /* relative control URL */
 473                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 474                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 475             } else {
 476                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 477             }
 478         } else if (av_strstart(p, "rtpmap:", &p)) {
 479             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 480             get_word(buf1, sizeof(buf1), &p);
 481             payload_type = atoi(buf1);
 482             for(i = 0; i < s->nb_streams;i++) {
 483                 st = s->streams[i];
 484                 rtsp_st = st->priv_data;
 485                 if (rtsp_st->sdp_payload_type == payload_type) {
 486                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 487                 }
 488             }
 489         } else if (av_strstart(p, "fmtp:", &p)) {
 490             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' 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                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 498                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 499                             sdp_parse_fmtp(st, p);
 500                         }
 501                     } else {
 502                         sdp_parse_fmtp(st, p);
 503                     }
 504                 }
 505             }
 506         } else if(av_strstart(p, "framesize:", &p)) {
 507             // let dynamic protocol handlers have a stab at the line.
 508             get_word(buf1, sizeof(buf1), &p);
 509             payload_type = atoi(buf1);
 510             for(i = 0; i < s->nb_streams;i++) {
 511                 st = s->streams[i];
 512                 rtsp_st = st->priv_data;
 513                 if (rtsp_st->sdp_payload_type == payload_type) {
 514                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 515                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 516                     }
 517                 }
 518             }
 519         } else if(av_strstart(p, "range:", &p)) {
 520             int64_t start, end;
 521
 522             // this is so that seeking on a streamed file can work.
 523             rtsp_parse_range_npt(p, &start, &end);
 524             s->start_time= start;
 525             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 526         }
 527         break;
 528     }
 529 }
 530
 531 static int sdp_parse(AVFormatContext *s, const char *content)
 532 {
 533     const char *p;
 534     int letter;
 535     char buf[1024], *q;
 536     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 537
 538     memset(s1, 0, sizeof(SDPParseState));
 539     p = content;
 540     for(;;) {
 541         skip_spaces(&p);
 542         letter = *p;
 543         if (letter == '\0')
 544             break;
 545         p++;
 546         if (*p != '=')
 547             goto next_line;
 548         p++;
 549         /* get the content */
 550         q = buf;
 551         while (*p != '\n' && *p != '\r' && *p != '\0') {
 552             if ((q - buf) < sizeof(buf) - 1)
 553                 *q++ = *p;
 554             p++;
 555         }
 556         *q = '\0';
 557         sdp_parse_line(s, s1, letter, buf);
 558     next_line:
 559         while (*p != '\n' && *p != '\0')
 560             p++;
 561         if (*p == '\n')
 562             p++;
 563     }
 564     return 0;
 565 }
 566
 567 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 568 {
 569     const char *p;
 570     int v;
 571
 572     p = *pp;
 573     skip_spaces(&p);
 574     v = strtol(p, (char **)&p, 10);
 575     if (*p == '-') {
 576         p++;
 577         *min_ptr = v;
 578         v = strtol(p, (char **)&p, 10);
 579         *max_ptr = v;
 580     } else {
 581         *min_ptr = v;
 582         *max_ptr = v;
 583     }
 584     *pp = p;
 585 }
 586
 587 /* XXX: only one transport specification is parsed */
 588 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 589 {
 590     char transport_protocol[16];
 591     char profile[16];
 592     char lower_transport[16];
 593     char parameter[16];
 594     RTSPTransportField *th;
 595     char buf[256];
 596
 597     reply->nb_transports = 0;
 598
 599     for(;;) {
 600         skip_spaces(&p);
 601         if (*p == '\0')
 602             break;
 603
 604         th = &reply->transports[reply->nb_transports];
 605
 606         get_word_sep(transport_protocol, sizeof(transport_protocol),
 607                      "/", &p);
 608         if (*p == '/')
 609             p++;
 610         if (!strcasecmp (transport_protocol, "rtp")) {
 611             get_word_sep(profile, sizeof(profile), "/;,", &p);
 612             lower_transport[0] = '\0';
 613             /* rtp/avp/<protocol> */
 614             if (*p == '/') {
 615                 p++;
 616                 get_word_sep(lower_transport, sizeof(lower_transport),
 617                              ";,", &p);
 618                 }
 619         } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
 620             /* x-pn-tng/<protocol> */
 621             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 622             profile[0] = '\0';
 623         }
 624         if (!strcasecmp(lower_transport, "TCP"))
 625             th->protocol = RTSP_PROTOCOL_RTP_TCP;
 626         else
 627             th->protocol = RTSP_PROTOCOL_RTP_UDP;
 628
 629         if (*p == ';')
 630             p++;
 631         /* get each parameter */
 632         while (*p != '\0' && *p != ',') {
 633             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 634             if (!strcmp(parameter, "port")) {
 635                 if (*p == '=') {
 636                     p++;
 637                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 638                 }
 639             } else if (!strcmp(parameter, "client_port")) {
 640                 if (*p == '=') {
 641                     p++;
 642                     rtsp_parse_range(&th->client_port_min,
 643                                      &th->client_port_max, &p);
 644                 }
 645             } else if (!strcmp(parameter, "server_port")) {
 646                 if (*p == '=') {
 647                     p++;
 648                     rtsp_parse_range(&th->server_port_min,
 649                                      &th->server_port_max, &p);
 650                 }
 651             } else if (!strcmp(parameter, "interleaved")) {
 652                 if (*p == '=') {
 653                     p++;
 654                     rtsp_parse_range(&th->interleaved_min,
 655                                      &th->interleaved_max, &p);
 656                 }
 657             } else if (!strcmp(parameter, "multicast")) {
 658                 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
 659                     th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
 660             } else if (!strcmp(parameter, "ttl")) {
 661                 if (*p == '=') {
 662                     p++;
 663                     th->ttl = strtol(p, (char **)&p, 10);
 664                 }
 665             } else if (!strcmp(parameter, "destination")) {
 666                 struct in_addr ipaddr;
 667
 668                 if (*p == '=') {
 669                     p++;
 670                     get_word_sep(buf, sizeof(buf), ";,", &p);
 671                     if (inet_aton(buf, &ipaddr))
 672                         th->destination = ntohl(ipaddr.s_addr);
 673                 }
 674             }
 675             while (*p != ';' && *p != '\0' && *p != ',')
 676                 p++;
 677             if (*p == ';')
 678                 p++;
 679         }
 680         if (*p == ',')
 681             p++;
 682
 683         reply->nb_transports++;
 684     }
 685 }
 686
 687 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 688 {
 689     const char *p;
 690
 691     /* NOTE: we do case independent match for broken servers */
 692     p = buf;
 693     if (av_stristart(p, "Session:", &p)) {
 694         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 695     } else if (av_stristart(p, "Content-Length:", &p)) {
 696         reply->content_length = strtol(p, NULL, 10);
 697     } else if (av_stristart(p, "Transport:", &p)) {
 698         rtsp_parse_transport(reply, p);
 699     } else if (av_stristart(p, "CSeq:", &p)) {
 700         reply->seq = strtol(p, NULL, 10);
 701     } else if (av_stristart(p, "Range:", &p)) {
 702         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 703     }
 704 }
 705
 706 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 707 {
 708     int ret, len;
 709
 710     len = 0;
 711     while (len < size) {
 712         ret = url_read(h, buf+len, size-len);
 713         if (ret < 1)
 714             return ret;
 715         len += ret;
 716     }
 717     return len;
 718 }
 719
 720 /* skip a RTP/TCP interleaved packet */
 721 static void rtsp_skip_packet(AVFormatContext *s)
 722 {
 723     RTSPState *rt = s->priv_data;
 724     int ret, len, len1;
 725     uint8_t buf[1024];
 726
 727     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 728     if (ret != 3)
 729         return;
 730     len = AV_RB16(buf + 1);
 731 #ifdef DEBUG
 732     printf("skipping RTP packet len=%d\n", len);
 733 #endif
 734     /* skip payload */
 735     while (len > 0) {
 736         len1 = len;
 737         if (len1 > sizeof(buf))
 738             len1 = sizeof(buf);
 739         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 740         if (ret != len1)
 741             return;
 742         len -= len1;
 743     }
 744 }
 745
 746 static void rtsp_send_cmd(AVFormatContext *s,
 747                           const char *cmd, RTSPHeader *reply,
 748                           unsigned char **content_ptr)
 749 {
 750     RTSPState *rt = s->priv_data;
 751     char buf[4096], buf1[1024], *q;
 752     unsigned char ch;
 753     const char *p;
 754     int content_length, line_count;
 755     unsigned char *content = NULL;
 756
 757     memset(reply, 0, sizeof(RTSPHeader));
 758
 759     rt->seq++;
 760     av_strlcpy(buf, cmd, sizeof(buf));
 761     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 762     av_strlcat(buf, buf1, sizeof(buf));
 763     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 764         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 765         av_strlcat(buf, buf1, sizeof(buf));
 766     }
 767     av_strlcat(buf, "\r\n", sizeof(buf));
 768 #ifdef DEBUG
 769     printf("Sending:\n%s--\n", buf);
 770 #endif
 771     url_write(rt->rtsp_hd, buf, strlen(buf));
 772
 773     /* parse reply (XXX: use buffers) */
 774     line_count = 0;
 775     rt->last_reply[0] = '\0';
 776     for(;;) {
 777         q = buf;
 778         for(;;) {
 779             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 780                 break;
 781             if (ch == '\n')
 782                 break;
 783             if (ch == '$') {
 784                 /* XXX: only parse it if first char on line ? */
 785                 rtsp_skip_packet(s);
 786             } else if (ch != '\r') {
 787                 if ((q - buf) < sizeof(buf) - 1)
 788                     *q++ = ch;
 789             }
 790         }
 791         *q = '\0';
 792 #ifdef DEBUG
 793         printf("line='%s'\n", buf);
 794 #endif
 795         /* test if last line */
 796         if (buf[0] == '\0')
 797             break;
 798         p = buf;
 799         if (line_count == 0) {
 800             /* get reply code */
 801             get_word(buf1, sizeof(buf1), &p);
 802             get_word(buf1, sizeof(buf1), &p);
 803             reply->status_code = atoi(buf1);
 804         } else {
 805             rtsp_parse_line(reply, p);
 806             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 807             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 808         }
 809         line_count++;
 810     }
 811
 812     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 813         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 814
 815     content_length = reply->content_length;
 816     if (content_length > 0) {
 817         /* leave some room for a trailing '\0' (useful for simple parsing) */
 818         content = av_malloc(content_length + 1);
 819         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 820         content[content_length] = '\0';
 821     }
 822     if (content_ptr)
 823         *content_ptr = content;
 824     else
 825         av_free(content);
 826 }
 827
 828
 829 /* close and free RTSP streams */
 830 static void rtsp_close_streams(RTSPState *rt)
 831 {
 832     int i;
 833     RTSPStream *rtsp_st;
 834
 835     for(i=0;i<rt->nb_rtsp_streams;i++) {
 836         rtsp_st = rt->rtsp_streams[i];
 837         if (rtsp_st) {
 838             if (rtsp_st->rtp_ctx)
 839                 rtp_parse_close(rtsp_st->rtp_ctx);
 840             if (rtsp_st->rtp_handle)
 841                 url_close(rtsp_st->rtp_handle);
 842             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 843                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 844         }
 845         av_free(rtsp_st);
 846     }
 847     av_free(rt->rtsp_streams);
 848 }
 849
 850 /**
 851  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 852  */
 853 static int
 854 make_setup_request (AVFormatContext *s, const char *host, int port, int protocol)
 855 {
 856     RTSPState *rt = s->priv_data;
 857     int j, i, err;
 858     RTSPStream *rtsp_st;
 859     AVStream *st;
 860     RTSPHeader reply1, *reply = &reply1;
 861     char cmd[2048];
 862
 863     /* for each stream, make the setup request */
 864     /* XXX: we assume the same server is used for the control of each
 865        RTSP stream */
 866
 867     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 868         char transport[2048];
 869
 870         rtsp_st = rt->rtsp_streams[i];
 871
 872         /* compute available transports */
 873         transport[0] = '\0';
 874
 875         /* RTP/UDP */
 876         if (protocol == RTSP_PROTOCOL_RTP_UDP) {
 877             char buf[256];
 878
 879             /* first try in specified port range */
 880             if (RTSP_RTP_PORT_MIN != 0) {
 881                 while(j <= RTSP_RTP_PORT_MAX) {
 882                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 883                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 884                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 885                         goto rtp_opened;
 886                     }
 887                 }
 888             }
 889
 890 /*            then try on any port
 891 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 892 **                err = AVERROR_INVALIDDATA;
 893 **                goto fail;
 894 **            }
 895 */
 896
 897         rtp_opened:
 898             port = rtp_get_local_port(rtsp_st->rtp_handle);
 899             if (transport[0] != '\0')
 900                 av_strlcat(transport, ",", sizeof(transport));
 901             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 902                      "RTP/AVP/UDP;unicast;client_port=%d-%d",
 903                      port, port + 1);
 904         }
 905
 906         /* RTP/TCP */
 907         else if (protocol == RTSP_PROTOCOL_RTP_TCP) {
 908             if (transport[0] != '\0')
 909                 av_strlcat(transport, ",", sizeof(transport));
 910             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 911                      "RTP/AVP/TCP");
 912         }
 913
 914         else if (protocol == RTSP_PROTOCOL_RTP_UDP_MULTICAST) {
 915             if (transport[0] != '\0')
 916                 av_strlcat(transport, ",", sizeof(transport));
 917             snprintf(transport + strlen(transport),
 918                      sizeof(transport) - strlen(transport) - 1,
 919                      "RTP/AVP/UDP;multicast");
 920         }
 921         snprintf(cmd, sizeof(cmd),
 922                  "SETUP %s RTSP/1.0\r\n"
 923                  "Transport: %s\r\n",
 924                  rtsp_st->control_url, transport);
 925         rtsp_send_cmd(s, cmd, reply, NULL);
 926         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
 927             err = 1;
 928             goto fail;
 929         } else if (reply->status_code != RTSP_STATUS_OK ||
 930                    reply->nb_transports != 1) {
 931             err = AVERROR_INVALIDDATA;
 932             goto fail;
 933         }
 934
 935         /* XXX: same protocol for all streams is required */
 936         if (i > 0) {
 937             if (reply->transports[0].protocol != rt->protocol) {
 938                 err = AVERROR_INVALIDDATA;
 939                 goto fail;
 940             }
 941         } else {
 942             rt->protocol = reply->transports[0].protocol;
 943         }
 944
 945         /* close RTP connection if not choosen */
 946         if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
 947             (protocol == RTSP_PROTOCOL_RTP_UDP)) {
 948             url_close(rtsp_st->rtp_handle);
 949             rtsp_st->rtp_handle = NULL;
 950         }
 951
 952         switch(reply->transports[0].protocol) {
 953         case RTSP_PROTOCOL_RTP_TCP:
 954             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
 955             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
 956             break;
 957
 958         case RTSP_PROTOCOL_RTP_UDP:
 959             {
 960                 char url[1024];
 961
 962                 /* XXX: also use address if specified */
 963                 snprintf(url, sizeof(url), "rtp://%s:%d",
 964                          host, reply->transports[0].server_port_min);
 965                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
 966                     err = AVERROR_INVALIDDATA;
 967                     goto fail;
 968                 }
 969             }
 970             break;
 971         case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
 972             {
 973                 char url[1024];
 974                 struct in_addr in;
 975
 976                 in.s_addr = htonl(reply->transports[0].destination);
 977                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
 978                          inet_ntoa(in),
 979                          reply->transports[0].port_min,
 980                          reply->transports[0].ttl);
 981                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
 982                     err = AVERROR_INVALIDDATA;
 983                     goto fail;
 984                 }
 985             }
 986             break;
 987         }
 988         /* open the RTP context */
 989         st = NULL;
 990         if (rtsp_st->stream_index >= 0)
 991             st = s->streams[rtsp_st->stream_index];
 992         if (!st)
 993             s->ctx_flags |= AVFMTCTX_NOHEADER;
 994         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
 995
 996         if (!rtsp_st->rtp_ctx) {
 997             err = AVERROR(ENOMEM);
 998             goto fail;
 999         } else {
1000             if(rtsp_st->dynamic_handler) {
1001                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1002                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1003             }
1004         }
1005     }
1006
1007     return 0;
1008
1009 fail:
1010     for (i=0; i<rt->nb_rtsp_streams; i++) {
1011         if (rt->rtsp_streams[i]->rtp_handle) {
1012             url_close(rt->rtsp_streams[i]->rtp_handle);
1013             rt->rtsp_streams[i]->rtp_handle = NULL;
1014         }
1015     }
1016     return err;
1017 }
1018
1019 static int rtsp_read_header(AVFormatContext *s,
1020                             AVFormatParameters *ap)
1021 {
1022     RTSPState *rt = s->priv_data;
1023     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1024     URLContext *rtsp_hd;
1025     int port, ret, err;
1026     RTSPHeader reply1, *reply = &reply1;
1027     unsigned char *content = NULL;
1028     int protocol_mask = 0;
1029
1030     /* extract hostname and port */
1031     url_split(NULL, 0, NULL, 0,
1032               host, sizeof(host), &port, path, sizeof(path), s->filename);
1033     if (port < 0)
1034         port = RTSP_DEFAULT_PORT;
1035
1036     /* search for options */
1037     option_list = strchr(path, '?');
1038     if (option_list) {
1039         /* remove the options from the path */
1040         *option_list++ = 0;
1041         while(option_list) {
1042             /* move the option pointer */
1043             option = option_list;
1044             option_list = strchr(option_list, '&');
1045             if (option_list)
1046                 *(option_list++) = 0;
1047             /* handle the options */
1048             if (strcmp(option, "udp") == 0)
1049                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
1050             else if (strcmp(option, "multicast") == 0)
1051                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
1052             else if (strcmp(option, "tcp") == 0)
1053                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
1054         }
1055     }
1056
1057     if (!protocol_mask)
1058         protocol_mask = (1 << RTSP_PROTOCOL_RTP_LAST) - 1;
1059
1060     /* open the tcp connexion */
1061     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1062     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1063         return AVERROR(EIO);
1064     rt->rtsp_hd = rtsp_hd;
1065     rt->seq = 0;
1066
1067     /* describe the stream */
1068     snprintf(cmd, sizeof(cmd),
1069              "DESCRIBE %s RTSP/1.0\r\n"
1070              "Accept: application/sdp\r\n",
1071              s->filename);
1072     rtsp_send_cmd(s, cmd, reply, &content);
1073     if (!content) {
1074         err = AVERROR_INVALIDDATA;
1075         goto fail;
1076     }
1077     if (reply->status_code != RTSP_STATUS_OK) {
1078         err = AVERROR_INVALIDDATA;
1079         goto fail;
1080     }
1081
1082     /* now we got the SDP description, we parse it */
1083     ret = sdp_parse(s, (const char *)content);
1084     av_freep(&content);
1085     if (ret < 0) {
1086         err = AVERROR_INVALIDDATA;
1087         goto fail;
1088     }
1089
1090     do {
1091         int protocol = ff_log2_tab[protocol_mask & ~(protocol_mask - 1)];
1092
1093         err = make_setup_request(s, host, port, protocol);
1094         if (err < 0)
1095             goto fail;
1096         protocol_mask &= ~(1 << protocol);
1097         if (protocol_mask == 0 && err == 1) {
1098             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1099             goto fail;
1100         }
1101     } while (err);
1102
1103     rt->state = RTSP_STATE_IDLE;
1104     rt->seek_timestamp = 0; /* default is to start stream at position
1105                                zero */
1106     if (ap->initial_pause) {
1107         /* do not start immediately */
1108     } else {
1109         if (rtsp_read_play(s) < 0) {
1110             err = AVERROR_INVALIDDATA;
1111             goto fail;
1112         }
1113     }
1114     return 0;
1115  fail:
1116     rtsp_close_streams(rt);
1117     av_freep(&content);
1118     url_close(rt->rtsp_hd);
1119     return err;
1120 }
1121
1122 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1123                            uint8_t *buf, int buf_size)
1124 {
1125     RTSPState *rt = s->priv_data;
1126     int id, len, i, ret;
1127     RTSPStream *rtsp_st;
1128
1129 #ifdef DEBUG_RTP_TCP
1130     printf("tcp_read_packet:\n");
1131 #endif
1132  redo:
1133     for(;;) {
1134         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1135 #ifdef DEBUG_RTP_TCP
1136         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1137 #endif
1138         if (ret != 1)
1139             return -1;
1140         if (buf[0] == '$')
1141             break;
1142     }
1143     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1144     if (ret != 3)
1145         return -1;
1146     id = buf[0];
1147     len = AV_RB16(buf + 1);
1148 #ifdef DEBUG_RTP_TCP
1149     printf("id=%d len=%d\n", id, len);
1150 #endif
1151     if (len > buf_size || len < 12)
1152         goto redo;
1153     /* get the data */
1154     ret = url_readbuf(rt->rtsp_hd, buf, len);
1155     if (ret != len)
1156         return -1;
1157
1158     /* find the matching stream */
1159     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1160         rtsp_st = rt->rtsp_streams[i];
1161         if (id >= rtsp_st->interleaved_min &&
1162             id <= rtsp_st->interleaved_max)
1163             goto found;
1164     }
1165     goto redo;
1166  found:
1167     *prtsp_st = rtsp_st;
1168     return len;
1169 }
1170
1171 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1172                            uint8_t *buf, int buf_size)
1173 {
1174     RTSPState *rt = s->priv_data;
1175     RTSPStream *rtsp_st;
1176     fd_set rfds;
1177     int fd1, fd2, fd_max, n, i, ret;
1178     struct timeval tv;
1179
1180     for(;;) {
1181         if (url_interrupt_cb())
1182             return AVERROR(EINTR);
1183         FD_ZERO(&rfds);
1184         fd_max = -1;
1185         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1186             rtsp_st = rt->rtsp_streams[i];
1187             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1188             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1189             if (fd1 > fd_max)
1190                 fd_max = fd1;
1191             FD_SET(fd1, &rfds);
1192         }
1193         tv.tv_sec = 0;
1194         tv.tv_usec = 100 * 1000;
1195         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1196         if (n > 0) {
1197             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1198                 rtsp_st = rt->rtsp_streams[i];
1199                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1200                 if (FD_ISSET(fd1, &rfds)) {
1201                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1202                     if (ret > 0) {
1203                         *prtsp_st = rtsp_st;
1204                         return ret;
1205                     }
1206                 }
1207             }
1208         }
1209     }
1210 }
1211
1212 static int rtsp_read_packet(AVFormatContext *s,
1213                             AVPacket *pkt)
1214 {
1215     RTSPState *rt = s->priv_data;
1216     RTSPStream *rtsp_st;
1217     int ret, len;
1218     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1219
1220     /* get next frames from the same RTP packet */
1221     if (rt->cur_rtp) {
1222         ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1223         if (ret == 0) {
1224             rt->cur_rtp = NULL;
1225             return 0;
1226         } else if (ret == 1) {
1227             return 0;
1228         } else {
1229             rt->cur_rtp = NULL;
1230         }
1231     }
1232
1233     /* read next RTP packet */
1234  redo:
1235     switch(rt->protocol) {
1236     default:
1237     case RTSP_PROTOCOL_RTP_TCP:
1238         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1239         break;
1240     case RTSP_PROTOCOL_RTP_UDP:
1241     case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1242         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1243         if (len >=0 && rtsp_st->rtp_ctx)
1244             rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1245         break;
1246     }
1247     if (len < 0)
1248         return len;
1249     ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1250     if (ret < 0)
1251         goto redo;
1252     if (ret == 1) {
1253         /* more packets may follow, so we save the RTP context */
1254         rt->cur_rtp = rtsp_st->rtp_ctx;
1255     }
1256     return 0;
1257 }
1258
1259 static int rtsp_read_play(AVFormatContext *s)
1260 {
1261     RTSPState *rt = s->priv_data;
1262     RTSPHeader reply1, *reply = &reply1;
1263     char cmd[1024];
1264
1265     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1266
1267     if (rt->state == RTSP_STATE_PAUSED) {
1268         snprintf(cmd, sizeof(cmd),
1269                  "PLAY %s RTSP/1.0\r\n",
1270                  s->filename);
1271     } else {
1272         snprintf(cmd, sizeof(cmd),
1273                  "PLAY %s RTSP/1.0\r\n"
1274                  "Range: npt=%0.3f-\r\n",
1275                  s->filename,
1276                  (double)rt->seek_timestamp / AV_TIME_BASE);
1277     }
1278     rtsp_send_cmd(s, cmd, reply, NULL);
1279     if (reply->status_code != RTSP_STATUS_OK) {
1280         return -1;
1281     } else {
1282         rt->state = RTSP_STATE_PLAYING;
1283         return 0;
1284     }
1285 }
1286
1287 /* pause the stream */
1288 static int rtsp_read_pause(AVFormatContext *s)
1289 {
1290     RTSPState *rt = s->priv_data;
1291     RTSPHeader reply1, *reply = &reply1;
1292     char cmd[1024];
1293
1294     rt = s->priv_data;
1295
1296     if (rt->state != RTSP_STATE_PLAYING)
1297         return 0;
1298
1299     snprintf(cmd, sizeof(cmd),
1300              "PAUSE %s RTSP/1.0\r\n",
1301              s->filename);
1302     rtsp_send_cmd(s, cmd, reply, NULL);
1303     if (reply->status_code != RTSP_STATUS_OK) {
1304         return -1;
1305     } else {
1306         rt->state = RTSP_STATE_PAUSED;
1307         return 0;
1308     }
1309 }
1310
1311 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1312                           int64_t timestamp, int flags)
1313 {
1314     RTSPState *rt = s->priv_data;
1315
1316     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1317     switch(rt->state) {
1318     default:
1319     case RTSP_STATE_IDLE:
1320         break;
1321     case RTSP_STATE_PLAYING:
1322         if (rtsp_read_play(s) != 0)
1323             return -1;
1324         break;
1325     case RTSP_STATE_PAUSED:
1326         rt->state = RTSP_STATE_IDLE;
1327         break;
1328     }
1329     return 0;
1330 }
1331
1332 static int rtsp_read_close(AVFormatContext *s)
1333 {
1334     RTSPState *rt = s->priv_data;
1335     RTSPHeader reply1, *reply = &reply1;
1336     char cmd[1024];
1337
1338 #if 0
1339     /* NOTE: it is valid to flush the buffer here */
1340     if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1341         url_fclose(&rt->rtsp_gb);
1342     }
1343 #endif
1344     snprintf(cmd, sizeof(cmd),
1345              "TEARDOWN %s RTSP/1.0\r\n",
1346              s->filename);
1347     rtsp_send_cmd(s, cmd, reply, NULL);
1348
1349     rtsp_close_streams(rt);
1350     url_close(rt->rtsp_hd);
1351     return 0;
1352 }
1353
1354 #ifdef CONFIG_RTSP_DEMUXER
1355 AVInputFormat rtsp_demuxer = {
1356     "rtsp",
1357     NULL_IF_CONFIG_SMALL("RTSP input format"),
1358     sizeof(RTSPState),
1359     rtsp_probe,
1360     rtsp_read_header,
1361     rtsp_read_packet,
1362     rtsp_read_close,
1363     rtsp_read_seek,
1364     .flags = AVFMT_NOFILE,
1365     .read_play = rtsp_read_play,
1366     .read_pause = rtsp_read_pause,
1367 };
1368 #endif
1369
1370 static int sdp_probe(AVProbeData *p1)
1371 {
1372     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1373
1374     /* we look for a line beginning "c=IN IP4" */
1375     while (p < p_end && *p != '\0') {
1376         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1377             return AVPROBE_SCORE_MAX / 2;
1378
1379         while(p < p_end - 1 && *p != '\n') p++;
1380         if (++p >= p_end)
1381             break;
1382         if (*p == '\r')
1383             p++;
1384     }
1385     return 0;
1386 }
1387
1388 #define SDP_MAX_SIZE 8192
1389
1390 static int sdp_read_header(AVFormatContext *s,
1391                            AVFormatParameters *ap)
1392 {
1393     RTSPState *rt = s->priv_data;
1394     RTSPStream *rtsp_st;
1395     int size, i, err;
1396     char *content;
1397     char url[1024];
1398     AVStream *st;
1399
1400     /* read the whole sdp file */
1401     /* XXX: better loading */
1402     content = av_malloc(SDP_MAX_SIZE);
1403     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1404     if (size <= 0) {
1405         av_free(content);
1406         return AVERROR_INVALIDDATA;
1407     }
1408     content[size] ='\0';
1409
1410     sdp_parse(s, content);
1411     av_free(content);
1412
1413     /* open each RTP stream */
1414     for(i=0;i<rt->nb_rtsp_streams;i++) {
1415         rtsp_st = rt->rtsp_streams[i];
1416
1417         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1418                  inet_ntoa(rtsp_st->sdp_ip),
1419                  rtsp_st->sdp_port,
1420                  rtsp_st->sdp_port,
1421                  rtsp_st->sdp_ttl);
1422         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1423             err = AVERROR_INVALIDDATA;
1424             goto fail;
1425         }
1426         /* open the RTP context */
1427         st = NULL;
1428         if (rtsp_st->stream_index >= 0)
1429             st = s->streams[rtsp_st->stream_index];
1430         if (!st)
1431             s->ctx_flags |= AVFMTCTX_NOHEADER;
1432         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1433         if (!rtsp_st->rtp_ctx) {
1434             err = AVERROR(ENOMEM);
1435             goto fail;
1436         } else {
1437             if(rtsp_st->dynamic_handler) {
1438                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1439                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1440             }
1441         }
1442     }
1443     return 0;
1444  fail:
1445     rtsp_close_streams(rt);
1446     return err;
1447 }
1448
1449 static int sdp_read_packet(AVFormatContext *s,
1450                             AVPacket *pkt)
1451 {
1452     return rtsp_read_packet(s, pkt);
1453 }
1454
1455 static int sdp_read_close(AVFormatContext *s)
1456 {
1457     RTSPState *rt = s->priv_data;
1458     rtsp_close_streams(rt);
1459     return 0;
1460 }
1461
1462 #ifdef CONFIG_SDP_DEMUXER
1463 AVInputFormat sdp_demuxer = {
1464     "sdp",
1465     NULL_IF_CONFIG_SMALL("SDP"),
1466     sizeof(RTSPState),
1467     sdp_probe,
1468     sdp_read_header,
1469     sdp_read_packet,
1470     sdp_read_close,
1471 };
1472 #endif
1473
1474 #ifdef CONFIG_REDIR_DEMUXER
1475 /* dummy redirector format (used directly in av_open_input_file now) */
1476 static int redir_probe(AVProbeData *pd)
1477 {
1478     const char *p;
1479     p = pd->buf;
1480     while (redir_isspace(*p))
1481         p++;
1482     if (av_strstart(p, "http://", NULL) ||
1483         av_strstart(p, "rtsp://", NULL))
1484         return AVPROBE_SCORE_MAX;
1485     return 0;
1486 }
1487
1488 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1489 {
1490     char buf[4096], *q;
1491     int c;
1492     AVFormatContext *ic = NULL;
1493     ByteIOContext *f = s->pb;
1494
1495     /* parse each URL and try to open it */
1496     c = url_fgetc(f);
1497     while (c != URL_EOF) {
1498         /* skip spaces */
1499         for(;;) {
1500             if (!redir_isspace(c))
1501                 break;
1502             c = url_fgetc(f);
1503         }
1504         if (c == URL_EOF)
1505             break;
1506         /* record url */
1507         q = buf;
1508         for(;;) {
1509             if (c == URL_EOF || redir_isspace(c))
1510                 break;
1511             if ((q - buf) < sizeof(buf) - 1)
1512                 *q++ = c;
1513             c = url_fgetc(f);
1514         }
1515         *q = '\0';
1516         //printf("URL='%s'\n", buf);
1517         /* try to open the media file */
1518         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1519             break;
1520     }
1521     if (!ic)
1522         return AVERROR(EIO);
1523
1524     *s = *ic;
1525     url_fclose(f);
1526
1527     return 0;
1528 }
1529
1530 AVInputFormat redir_demuxer = {
1531     "redir",
1532     NULL_IF_CONFIG_SMALL("Redirector format"),
1533     0,
1534     redir_probe,
1535     redir_read_header,
1536     NULL,
1537     NULL,
1538 };
1539 #endif