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 #include "avformat.h"
  22
  23 #include <sys/time.h>
  24 #include <unistd.h> /* for select() prototype */
  25 #include "network.h"
  26 #include "avstring.h"
  27 #include "rtsp.h"
  28
  29 #include "rtp_internal.h"
  30
  31 //#define DEBUG
  32 //#define DEBUG_RTP_TCP
  33
  34 enum RTSPClientState {
  35     RTSP_STATE_IDLE,
  36     RTSP_STATE_PLAYING,
  37     RTSP_STATE_PAUSED,
  38 };
  39
  40 typedef struct RTSPState {
  41     URLContext *rtsp_hd; /* RTSP TCP connexion handle */
  42     int nb_rtsp_streams;
  43     struct RTSPStream **rtsp_streams;
  44
  45     enum RTSPClientState state;
  46     int64_t seek_timestamp;
  47
  48     /* XXX: currently we use unbuffered input */
  49     //    ByteIOContext rtsp_gb;
  50     int seq;        /* RTSP command sequence number */
  51     char session_id[512];
  52     enum RTSPProtocol protocol;
  53     char last_reply[2048]; /* XXX: allocate ? */
  54     RTPDemuxContext *cur_rtp;
  55 } RTSPState;
  56
  57 typedef struct RTSPStream {
  58     URLContext *rtp_handle; /* RTP stream handle */
  59     RTPDemuxContext *rtp_ctx; /* RTP parse context */
  60
  61     int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
  62     int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
  63     char control_url[1024]; /* url for this stream (from SDP) */
  64
  65     int sdp_port; /* port (from SDP content - not used in RTSP) */
  66     struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
  67     int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
  68     int sdp_payload_type; /* payload type - only used in SDP */
  69     rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
  70
  71     RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
  72     void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
  73 } RTSPStream;
  74
  75 static int rtsp_read_play(AVFormatContext *s);
  76
  77 /* XXX: currently, the only way to change the protocols consists in
  78    changing this variable */
  79
  80 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  81 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
  82 #endif
  83
  84 static int rtsp_probe(AVProbeData *p)
  85 {
  86     if (av_strstart(p->filename, "rtsp:", NULL))
  87         return AVPROBE_SCORE_MAX;
  88     return 0;
  89 }
  90
  91 static int redir_isspace(int c)
  92 {
  93     return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
  94 }
  95
  96 static void skip_spaces(const char **pp)
  97 {
  98     const char *p;
  99     p = *pp;
 100     while (redir_isspace(*p))
 101         p++;
 102     *pp = p;
 103 }
 104
 105 static void get_word_sep(char *buf, int buf_size, const char *sep,
 106                          const char **pp)
 107 {
 108     const char *p;
 109     char *q;
 110
 111     p = *pp;
 112     if (*p == '/')
 113         p++;
 114     skip_spaces(&p);
 115     q = buf;
 116     while (!strchr(sep, *p) && *p != '\0') {
 117         if ((q - buf) < buf_size - 1)
 118             *q++ = *p;
 119         p++;
 120     }
 121     if (buf_size > 0)
 122         *q = '\0';
 123     *pp = p;
 124 }
 125
 126 static void get_word(char *buf, int buf_size, const char **pp)
 127 {
 128     const char *p;
 129     char *q;
 130
 131     p = *pp;
 132     skip_spaces(&p);
 133     q = buf;
 134     while (!redir_isspace(*p) && *p != '\0') {
 135         if ((q - buf) < buf_size - 1)
 136             *q++ = *p;
 137         p++;
 138     }
 139     if (buf_size > 0)
 140         *q = '\0';
 141     *pp = p;
 142 }
 143
 144 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 145    params>] */
 146 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 147 {
 148     char buf[256];
 149     int i;
 150     AVCodec *c;
 151     const char *c_name;
 152
 153     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 154        see if we can handle this kind of payload */
 155     get_word_sep(buf, sizeof(buf), "/", &p);
 156     if (payload_type >= RTP_PT_PRIVATE) {
 157         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 158         while(handler) {
 159             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 160                 codec->codec_id = handler->codec_id;
 161                 rtsp_st->dynamic_handler= handler;
 162                 if(handler->open) {
 163                     rtsp_st->dynamic_protocol_context= handler->open();
 164                 }
 165                 break;
 166             }
 167             handler= handler->next;
 168         }
 169     } else {
 170         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 171         /* search into AVRtpPayloadTypes[] */
 172         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 173     }
 174
 175     c = avcodec_find_decoder(codec->codec_id);
 176     if (c && c->name)
 177         c_name = c->name;
 178     else
 179         c_name = (char *)NULL;
 180
 181     if (c_name) {
 182         get_word_sep(buf, sizeof(buf), "/", &p);
 183         i = atoi(buf);
 184         switch (codec->codec_type) {
 185             case CODEC_TYPE_AUDIO:
 186                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 187                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 188                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 189                 if (i > 0) {
 190                     codec->sample_rate = i;
 191                     get_word_sep(buf, sizeof(buf), "/", &p);
 192                     i = atoi(buf);
 193                     if (i > 0)
 194                         codec->channels = i;
 195                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 196                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 197                 }
 198                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 199                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 200                 break;
 201             case CODEC_TYPE_VIDEO:
 202                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 203                 break;
 204             default:
 205                 break;
 206         }
 207         return 0;
 208     }
 209
 210     return -1;
 211 }
 212
 213 /* return the length and optionnaly the data */
 214 static int hex_to_data(uint8_t *data, const char *p)
 215 {
 216     int c, len, v;
 217
 218     len = 0;
 219     v = 1;
 220     for(;;) {
 221         skip_spaces(&p);
 222         if (p == '\0')
 223             break;
 224         c = toupper((unsigned char)*p++);
 225         if (c >= '0' && c <= '9')
 226             c = c - '0';
 227         else if (c >= 'A' && c <= 'F')
 228             c = c - 'A' + 10;
 229         else
 230             break;
 231         v = (v << 4) | c;
 232         if (v & 0x100) {
 233             if (data)
 234                 data[len] = v;
 235             len++;
 236             v = 1;
 237         }
 238     }
 239     return len;
 240 }
 241
 242 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 243 {
 244     switch (codec->codec_id) {
 245         case CODEC_ID_MPEG4:
 246         case CODEC_ID_AAC:
 247             if (!strcmp(attr, "config")) {
 248                 /* decode the hexa encoded parameter */
 249                 int len = hex_to_data(NULL, value);
 250                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 251                 if (!codec->extradata)
 252                     return;
 253                 codec->extradata_size = len;
 254                 hex_to_data(codec->extradata, value);
 255             }
 256             break;
 257         default:
 258             break;
 259     }
 260     return;
 261 }
 262
 263 typedef struct attrname_map
 264 {
 265     const char *str;
 266     uint16_t type;
 267     uint32_t offset;
 268 } attrname_map_t;
 269
 270 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 271 #define ATTR_NAME_TYPE_INT 0
 272 #define ATTR_NAME_TYPE_STR 1
 273 static attrname_map_t attr_names[]=
 274 {
 275     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
 276     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
 277     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
 278     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
 279     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
 280     {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
 281     {NULL, -1, -1},
 282 };
 283
 284 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 285 * because it is used in rtp_h264.c, which is forthcoming.
 286 */
 287 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 288 {
 289     skip_spaces(p);
 290     if(**p)
 291     {
 292         get_word_sep(attr, attr_size, "=", p);
 293         if (**p == '=')
 294             (*p)++;
 295         get_word_sep(value, value_size, ";", p);
 296         if (**p == ';')
 297             (*p)++;
 298         return 1;
 299     }
 300     return 0;
 301 }
 302
 303 /* parse a SDP line and save stream attributes */
 304 static void sdp_parse_fmtp(AVStream *st, const char *p)
 305 {
 306     char attr[256];
 307     char value[4096];
 308     int i;
 309
 310     RTSPStream *rtsp_st = st->priv_data;
 311     AVCodecContext *codec = st->codec;
 312     rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
 313
 314     /* loop on each attribute */
 315     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 316     {
 317         /* grab the codec extra_data from the config parameter of the fmtp line */
 318         sdp_parse_fmtp_config(codec, attr, value);
 319         /* Looking for a known attribute */
 320         for (i = 0; attr_names[i].str; ++i) {
 321             if (!strcasecmp(attr, attr_names[i].str)) {
 322                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 323                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 324                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 325                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 326             }
 327         }
 328     }
 329 }
 330
 331 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 332  *  and end time.
 333  *  Used for seeking in the rtp stream.
 334  */
 335 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 336 {
 337     char buf[256];
 338
 339     skip_spaces(&p);
 340     if (!av_stristart(p, "npt=", &p))
 341         return;
 342
 343     *start = AV_NOPTS_VALUE;
 344     *end = AV_NOPTS_VALUE;
 345
 346     get_word_sep(buf, sizeof(buf), "-", &p);
 347     *start = parse_date(buf, 1);
 348     if (*p == '-') {
 349         p++;
 350         get_word_sep(buf, sizeof(buf), "-", &p);
 351         *end = parse_date(buf, 1);
 352     }
 353 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 354 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 355 }
 356
 357 typedef struct SDPParseState {
 358     /* SDP only */
 359     struct in_addr default_ip;
 360     int default_ttl;
 361 } SDPParseState;
 362
 363 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 364                            int letter, const char *buf)
 365 {
 366     RTSPState *rt = s->priv_data;
 367     char buf1[64], st_type[64];
 368     const char *p;
 369     int codec_type, payload_type, i;
 370     AVStream *st;
 371     RTSPStream *rtsp_st;
 372     struct in_addr sdp_ip;
 373     int ttl;
 374
 375 #ifdef DEBUG
 376     printf("sdp: %c='%s'\n", letter, buf);
 377 #endif
 378
 379     p = buf;
 380     switch(letter) {
 381     case 'c':
 382         get_word(buf1, sizeof(buf1), &p);
 383         if (strcmp(buf1, "IN") != 0)
 384             return;
 385         get_word(buf1, sizeof(buf1), &p);
 386         if (strcmp(buf1, "IP4") != 0)
 387             return;
 388         get_word_sep(buf1, sizeof(buf1), "/", &p);
 389         if (inet_aton(buf1, &sdp_ip) == 0)
 390             return;
 391         ttl = 16;
 392         if (*p == '/') {
 393             p++;
 394             get_word_sep(buf1, sizeof(buf1), "/", &p);
 395             ttl = atoi(buf1);
 396         }
 397         if (s->nb_streams == 0) {
 398             s1->default_ip = sdp_ip;
 399             s1->default_ttl = ttl;
 400         } else {
 401             st = s->streams[s->nb_streams - 1];
 402             rtsp_st = st->priv_data;
 403             rtsp_st->sdp_ip = sdp_ip;
 404             rtsp_st->sdp_ttl = ttl;
 405         }
 406         break;
 407     case 's':
 408         av_strlcpy(s->title, p, sizeof(s->title));
 409         break;
 410     case 'i':
 411         if (s->nb_streams == 0) {
 412             av_strlcpy(s->comment, p, sizeof(s->comment));
 413             break;
 414         }
 415         break;
 416     case 'm':
 417         /* new stream */
 418         get_word(st_type, sizeof(st_type), &p);
 419         if (!strcmp(st_type, "audio")) {
 420             codec_type = CODEC_TYPE_AUDIO;
 421         } else if (!strcmp(st_type, "video")) {
 422             codec_type = CODEC_TYPE_VIDEO;
 423         } else {
 424             return;
 425         }
 426         rtsp_st = av_mallocz(sizeof(RTSPStream));
 427         if (!rtsp_st)
 428             return;
 429         rtsp_st->stream_index = -1;
 430         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 431
 432         rtsp_st->sdp_ip = s1->default_ip;
 433         rtsp_st->sdp_ttl = s1->default_ttl;
 434
 435         get_word(buf1, sizeof(buf1), &p); /* port */
 436         rtsp_st->sdp_port = atoi(buf1);
 437
 438         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 439
 440         /* XXX: handle list of formats */
 441         get_word(buf1, sizeof(buf1), &p); /* format list */
 442         rtsp_st->sdp_payload_type = atoi(buf1);
 443
 444         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 445             /* no corresponding stream */
 446         } else {
 447             st = av_new_stream(s, 0);
 448             if (!st)
 449                 return;
 450             st->priv_data = rtsp_st;
 451             rtsp_st->stream_index = st->index;
 452             st->codec->codec_type = codec_type;
 453             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 454                 /* if standard payload type, we can find the codec right now */
 455                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 456             }
 457         }
 458         /* put a default control url */
 459         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 460         break;
 461     case 'a':
 462         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 463             char proto[32];
 464             /* get the control url */
 465             st = s->streams[s->nb_streams - 1];
 466             rtsp_st = st->priv_data;
 467
 468             /* XXX: may need to add full url resolution */
 469             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 470             if (proto[0] == '\0') {
 471                 /* relative control URL */
 472                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 473                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 474             } else {
 475                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 476             }
 477         } else if (av_strstart(p, "rtpmap:", &p)) {
 478             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 479             get_word(buf1, sizeof(buf1), &p);
 480             payload_type = atoi(buf1);
 481             for(i = 0; i < s->nb_streams;i++) {
 482                 st = s->streams[i];
 483                 rtsp_st = st->priv_data;
 484                 if (rtsp_st->sdp_payload_type == payload_type) {
 485                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 486                 }
 487             }
 488         } else if (av_strstart(p, "fmtp:", &p)) {
 489             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 490             get_word(buf1, sizeof(buf1), &p);
 491             payload_type = atoi(buf1);
 492             for(i = 0; i < s->nb_streams;i++) {
 493                 st = s->streams[i];
 494                 rtsp_st = st->priv_data;
 495                 if (rtsp_st->sdp_payload_type == payload_type) {
 496                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 497                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 498                             sdp_parse_fmtp(st, p);
 499                         }
 500                     } else {
 501                         sdp_parse_fmtp(st, p);
 502                     }
 503                 }
 504             }
 505         } else if(av_strstart(p, "framesize:", &p)) {
 506             // let dynamic protocol handlers have a stab at the line.
 507             get_word(buf1, sizeof(buf1), &p);
 508             payload_type = atoi(buf1);
 509             for(i = 0; i < s->nb_streams;i++) {
 510                 st = s->streams[i];
 511                 rtsp_st = st->priv_data;
 512                 if (rtsp_st->sdp_payload_type == payload_type) {
 513                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 514                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 515                     }
 516                 }
 517             }
 518         } else if(av_strstart(p, "range:", &p)) {
 519             int64_t start, end;
 520
 521             // this is so that seeking on a streamed file can work.
 522             rtsp_parse_range_npt(p, &start, &end);
 523             s->start_time= start;
 524             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 525         }
 526         break;
 527     }
 528 }
 529
 530 static int sdp_parse(AVFormatContext *s, const char *content)
 531 {
 532     const char *p;
 533     int letter;
 534     char buf[1024], *q;
 535     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 536
 537     memset(s1, 0, sizeof(SDPParseState));
 538     p = content;
 539     for(;;) {
 540         skip_spaces(&p);
 541         letter = *p;
 542         if (letter == '\0')
 543             break;
 544         p++;
 545         if (*p != '=')
 546             goto next_line;
 547         p++;
 548         /* get the content */
 549         q = buf;
 550         while (*p != '\n' && *p != '\r' && *p != '\0') {
 551             if ((q - buf) < sizeof(buf) - 1)
 552                 *q++ = *p;
 553             p++;
 554         }
 555         *q = '\0';
 556         sdp_parse_line(s, s1, letter, buf);
 557     next_line:
 558         while (*p != '\n' && *p != '\0')
 559             p++;
 560         if (*p == '\n')
 561             p++;
 562     }
 563     return 0;
 564 }
 565
 566 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 567 {
 568     const char *p;
 569     int v;
 570
 571     p = *pp;
 572     skip_spaces(&p);
 573     v = strtol(p, (char **)&p, 10);
 574     if (*p == '-') {
 575         p++;
 576         *min_ptr = v;
 577         v = strtol(p, (char **)&p, 10);
 578         *max_ptr = v;
 579     } else {
 580         *min_ptr = v;
 581         *max_ptr = v;
 582     }
 583     *pp = p;
 584 }
 585
 586 /* XXX: only one transport specification is parsed */
 587 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 588 {
 589     char transport_protocol[16];
 590     char profile[16];
 591     char lower_transport[16];
 592     char parameter[16];
 593     RTSPTransportField *th;
 594     char buf[256];
 595
 596     reply->nb_transports = 0;
 597
 598     for(;;) {
 599         skip_spaces(&p);
 600         if (*p == '\0')
 601             break;
 602
 603         th = &reply->transports[reply->nb_transports];
 604
 605         get_word_sep(transport_protocol, sizeof(transport_protocol),
 606                      "/", &p);
 607         if (*p == '/')
 608             p++;
 609         if (!strcasecmp (transport_protocol, "rtp")) {
 610             get_word_sep(profile, sizeof(profile), "/;,", &p);
 611             lower_transport[0] = '\0';
 612             /* rtp/avp/<protocol> */
 613             if (*p == '/') {
 614                 p++;
 615                 get_word_sep(lower_transport, sizeof(lower_transport),
 616                              ";,", &p);
 617                 }
 618         } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
 619             /* x-pn-tng/<protocol> */
 620             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 621             profile[0] = '\0';
 622         }
 623         if (!strcasecmp(lower_transport, "TCP"))
 624             th->protocol = RTSP_PROTOCOL_RTP_TCP;
 625         else
 626             th->protocol = RTSP_PROTOCOL_RTP_UDP;
 627
 628         if (*p == ';')
 629             p++;
 630         /* get each parameter */
 631         while (*p != '\0' && *p != ',') {
 632             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 633             if (!strcmp(parameter, "port")) {
 634                 if (*p == '=') {
 635                     p++;
 636                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 637                 }
 638             } else if (!strcmp(parameter, "client_port")) {
 639                 if (*p == '=') {
 640                     p++;
 641                     rtsp_parse_range(&th->client_port_min,
 642                                      &th->client_port_max, &p);
 643                 }
 644             } else if (!strcmp(parameter, "server_port")) {
 645                 if (*p == '=') {
 646                     p++;
 647                     rtsp_parse_range(&th->server_port_min,
 648                                      &th->server_port_max, &p);
 649                 }
 650             } else if (!strcmp(parameter, "interleaved")) {
 651                 if (*p == '=') {
 652                     p++;
 653                     rtsp_parse_range(&th->interleaved_min,
 654                                      &th->interleaved_max, &p);
 655                 }
 656             } else if (!strcmp(parameter, "multicast")) {
 657                 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
 658                     th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
 659             } else if (!strcmp(parameter, "ttl")) {
 660                 if (*p == '=') {
 661                     p++;
 662                     th->ttl = strtol(p, (char **)&p, 10);
 663                 }
 664             } else if (!strcmp(parameter, "destination")) {
 665                 struct in_addr ipaddr;
 666
 667                 if (*p == '=') {
 668                     p++;
 669                     get_word_sep(buf, sizeof(buf), ";,", &p);
 670                     if (inet_aton(buf, &ipaddr))
 671                         th->destination = ntohl(ipaddr.s_addr);
 672                 }
 673             }
 674             while (*p != ';' && *p != '\0' && *p != ',')
 675                 p++;
 676             if (*p == ';')
 677                 p++;
 678         }
 679         if (*p == ',')
 680             p++;
 681
 682         reply->nb_transports++;
 683     }
 684 }
 685
 686 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 687 {
 688     const char *p;
 689
 690     /* NOTE: we do case independent match for broken servers */
 691     p = buf;
 692     if (av_stristart(p, "Session:", &p)) {
 693         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 694     } else if (av_stristart(p, "Content-Length:", &p)) {
 695         reply->content_length = strtol(p, NULL, 10);
 696     } else if (av_stristart(p, "Transport:", &p)) {
 697         rtsp_parse_transport(reply, p);
 698     } else if (av_stristart(p, "CSeq:", &p)) {
 699         reply->seq = strtol(p, NULL, 10);
 700     } else if (av_stristart(p, "Range:", &p)) {
 701         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 702     }
 703 }
 704
 705 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 706 {
 707     int ret, len;
 708
 709     len = 0;
 710     while (len < size) {
 711         ret = url_read(h, buf+len, size-len);
 712         if (ret < 1)
 713             return ret;
 714         len += ret;
 715     }
 716     return len;
 717 }
 718
 719 /* skip a RTP/TCP interleaved packet */
 720 static void rtsp_skip_packet(AVFormatContext *s)
 721 {
 722     RTSPState *rt = s->priv_data;
 723     int ret, len, len1;
 724     uint8_t buf[1024];
 725
 726     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 727     if (ret != 3)
 728         return;
 729     len = AV_RB16(buf + 1);
 730 #ifdef DEBUG
 731     printf("skipping RTP packet len=%d\n", len);
 732 #endif
 733     /* skip payload */
 734     while (len > 0) {
 735         len1 = len;
 736         if (len1 > sizeof(buf))
 737             len1 = sizeof(buf);
 738         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 739         if (ret != len1)
 740             return;
 741         len -= len1;
 742     }
 743 }
 744
 745 static void rtsp_send_cmd(AVFormatContext *s,
 746                           const char *cmd, RTSPHeader *reply,
 747                           unsigned char **content_ptr)
 748 {
 749     RTSPState *rt = s->priv_data;
 750     char buf[4096], buf1[1024], *q;
 751     unsigned char ch;
 752     const char *p;
 753     int content_length, line_count;
 754     unsigned char *content = NULL;
 755
 756     memset(reply, 0, sizeof(RTSPHeader));
 757
 758     rt->seq++;
 759     av_strlcpy(buf, cmd, sizeof(buf));
 760     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 761     av_strlcat(buf, buf1, sizeof(buf));
 762     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 763         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 764         av_strlcat(buf, buf1, sizeof(buf));
 765     }
 766     av_strlcat(buf, "\r\n", sizeof(buf));
 767 #ifdef DEBUG
 768     printf("Sending:\n%s--\n", buf);
 769 #endif
 770     url_write(rt->rtsp_hd, buf, strlen(buf));
 771
 772     /* parse reply (XXX: use buffers) */
 773     line_count = 0;
 774     rt->last_reply[0] = '\0';
 775     for(;;) {
 776         q = buf;
 777         for(;;) {
 778             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 779                 break;
 780             if (ch == '\n')
 781                 break;
 782             if (ch == '$') {
 783                 /* XXX: only parse it if first char on line ? */
 784                 rtsp_skip_packet(s);
 785             } else if (ch != '\r') {
 786                 if ((q - buf) < sizeof(buf) - 1)
 787                     *q++ = ch;
 788             }
 789         }
 790         *q = '\0';
 791 #ifdef DEBUG
 792         printf("line='%s'\n", buf);
 793 #endif
 794         /* test if last line */
 795         if (buf[0] == '\0')
 796             break;
 797         p = buf;
 798         if (line_count == 0) {
 799             /* get reply code */
 800             get_word(buf1, sizeof(buf1), &p);
 801             get_word(buf1, sizeof(buf1), &p);
 802             reply->status_code = atoi(buf1);
 803         } else {
 804             rtsp_parse_line(reply, p);
 805             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 806             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 807         }
 808         line_count++;
 809     }
 810
 811     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 812         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 813
 814     content_length = reply->content_length;
 815     if (content_length > 0) {
 816         /* leave some room for a trailing '\0' (useful for simple parsing) */
 817         content = av_malloc(content_length + 1);
 818         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 819         content[content_length] = '\0';
 820     }
 821     if (content_ptr)
 822         *content_ptr = content;
 823     else
 824         av_free(content);
 825 }
 826
 827
 828 /* close and free RTSP streams */
 829 static void rtsp_close_streams(RTSPState *rt)
 830 {
 831     int i;
 832     RTSPStream *rtsp_st;
 833
 834     for(i=0;i<rt->nb_rtsp_streams;i++) {
 835         rtsp_st = rt->rtsp_streams[i];
 836         if (rtsp_st) {
 837             if (rtsp_st->rtp_ctx)
 838                 rtp_parse_close(rtsp_st->rtp_ctx);
 839             if (rtsp_st->rtp_handle)
 840                 url_close(rtsp_st->rtp_handle);
 841             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 842                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 843         }
 844         av_free(rtsp_st);
 845     }
 846     av_free(rt->rtsp_streams);
 847 }
 848
 849 static int rtsp_read_header(AVFormatContext *s,
 850                             AVFormatParameters *ap)
 851 {
 852     RTSPState *rt = s->priv_data;
 853     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
 854     URLContext *rtsp_hd;
 855     int port, i, j, ret, err;
 856     RTSPHeader reply1, *reply = &reply1;
 857     unsigned char *content = NULL;
 858     RTSPStream *rtsp_st;
 859     int protocol_mask = 0;
 860     AVStream *st;
 861
 862     /* extract hostname and port */
 863     url_split(NULL, 0, NULL, 0,
 864               host, sizeof(host), &port, path, sizeof(path), s->filename);
 865     if (port < 0)
 866         port = RTSP_DEFAULT_PORT;
 867
 868     /* search for options */
 869     option_list = strchr(path, '?');
 870     if (option_list) {
 871         /* remove the options from the path */
 872         *option_list++ = 0;
 873         while(option_list) {
 874             /* move the option pointer */
 875             option = option_list;
 876             option_list = strchr(option_list, '&');
 877             if (option_list)
 878                 *(option_list++) = 0;
 879             /* handle the options */
 880             if (strcmp(option, "udp") == 0)
 881                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
 882             else if (strcmp(option, "multicast") == 0)
 883                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
 884             else if (strcmp(option, "tcp") == 0)
 885                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
 886         }
 887     }
 888
 889     if (!protocol_mask)
 890         protocol_mask = rtsp_default_protocols;
 891
 892     /* open the tcp connexion */
 893     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
 894     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
 895         return AVERROR(EIO);
 896     rt->rtsp_hd = rtsp_hd;
 897     rt->seq = 0;
 898
 899     /* describe the stream */
 900     snprintf(cmd, sizeof(cmd),
 901              "DESCRIBE %s RTSP/1.0\r\n"
 902              "Accept: application/sdp\r\n",
 903              s->filename);
 904     rtsp_send_cmd(s, cmd, reply, &content);
 905     if (!content) {
 906         err = AVERROR_INVALIDDATA;
 907         goto fail;
 908     }
 909     if (reply->status_code != RTSP_STATUS_OK) {
 910         err = AVERROR_INVALIDDATA;
 911         goto fail;
 912     }
 913
 914     /* now we got the SDP description, we parse it */
 915     ret = sdp_parse(s, (const char *)content);
 916     av_freep(&content);
 917     if (ret < 0) {
 918         err = AVERROR_INVALIDDATA;
 919         goto fail;
 920     }
 921
 922     /* for each stream, make the setup request */
 923     /* XXX: we assume the same server is used for the control of each
 924        RTSP stream */
 925
 926     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 927         char transport[2048];
 928
 929         rtsp_st = rt->rtsp_streams[i];
 930
 931         /* compute available transports */
 932         transport[0] = '\0';
 933
 934         /* RTP/UDP */
 935         if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP)) {
 936             char buf[256];
 937
 938             /* first try in specified port range */
 939             if (RTSP_RTP_PORT_MIN != 0) {
 940                 while(j <= RTSP_RTP_PORT_MAX) {
 941                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 942                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 943                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 944                         goto rtp_opened;
 945                     }
 946                 }
 947             }
 948
 949 /*            then try on any port
 950 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 951 **                err = AVERROR_INVALIDDATA;
 952 **                goto fail;
 953 **            }
 954 */
 955
 956         rtp_opened:
 957             port = rtp_get_local_port(rtsp_st->rtp_handle);
 958             if (transport[0] != '\0')
 959                 av_strlcat(transport, ",", sizeof(transport));
 960             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 961                      "RTP/AVP/UDP;unicast;client_port=%d-%d",
 962                      port, port + 1);
 963         }
 964
 965         /* RTP/TCP */
 966         else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_TCP)) {
 967             if (transport[0] != '\0')
 968                 av_strlcat(transport, ",", sizeof(transport));
 969             snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
 970                      "RTP/AVP/TCP");
 971         }
 972
 973         else if (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP_MULTICAST)) {
 974             if (transport[0] != '\0')
 975                 av_strlcat(transport, ",", sizeof(transport));
 976             snprintf(transport + strlen(transport),
 977                      sizeof(transport) - strlen(transport) - 1,
 978                      "RTP/AVP/UDP;multicast");
 979         }
 980         snprintf(cmd, sizeof(cmd),
 981                  "SETUP %s RTSP/1.0\r\n"
 982                  "Transport: %s\r\n",
 983                  rtsp_st->control_url, transport);
 984         rtsp_send_cmd(s, cmd, reply, NULL);
 985         if (reply->status_code != RTSP_STATUS_OK ||
 986             reply->nb_transports != 1) {
 987             err = AVERROR_INVALIDDATA;
 988             goto fail;
 989         }
 990
 991         /* XXX: same protocol for all streams is required */
 992         if (i > 0) {
 993             if (reply->transports[0].protocol != rt->protocol) {
 994                 err = AVERROR_INVALIDDATA;
 995                 goto fail;
 996             }
 997         } else {
 998             rt->protocol = reply->transports[0].protocol;
 999         }
1000
1001         /* close RTP connection if not choosen */
1002         if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
1003             (protocol_mask & (1 << RTSP_PROTOCOL_RTP_UDP))) {
1004             url_close(rtsp_st->rtp_handle);
1005             rtsp_st->rtp_handle = NULL;
1006         }
1007
1008         switch(reply->transports[0].protocol) {
1009         case RTSP_PROTOCOL_RTP_TCP:
1010             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1011             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1012             break;
1013
1014         case RTSP_PROTOCOL_RTP_UDP:
1015             {
1016                 char url[1024];
1017
1018                 /* XXX: also use address if specified */
1019                 snprintf(url, sizeof(url), "rtp://%s:%d",
1020                          host, reply->transports[0].server_port_min);
1021                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1022                     err = AVERROR_INVALIDDATA;
1023                     goto fail;
1024                 }
1025             }
1026             break;
1027         case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1028             {
1029                 char url[1024];
1030                 struct in_addr in;
1031
1032                 in.s_addr = htonl(reply->transports[0].destination);
1033                 snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1034                          inet_ntoa(in),
1035                          reply->transports[0].port_min,
1036                          reply->transports[0].ttl);
1037                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1038                     err = AVERROR_INVALIDDATA;
1039                     goto fail;
1040                 }
1041             }
1042             break;
1043         }
1044         /* open the RTP context */
1045         st = NULL;
1046         if (rtsp_st->stream_index >= 0)
1047             st = s->streams[rtsp_st->stream_index];
1048         if (!st)
1049             s->ctx_flags |= AVFMTCTX_NOHEADER;
1050         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1051
1052         if (!rtsp_st->rtp_ctx) {
1053             err = AVERROR(ENOMEM);
1054             goto fail;
1055         } else {
1056             if(rtsp_st->dynamic_handler) {
1057                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1058                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1059             }
1060         }
1061     }
1062
1063     rt->state = RTSP_STATE_IDLE;
1064     rt->seek_timestamp = 0; /* default is to start stream at position
1065                                zero */
1066     if (ap->initial_pause) {
1067         /* do not start immediately */
1068     } else {
1069         if (rtsp_read_play(s) < 0) {
1070             err = AVERROR_INVALIDDATA;
1071             goto fail;
1072         }
1073     }
1074     return 0;
1075  fail:
1076     rtsp_close_streams(rt);
1077     av_freep(&content);
1078     url_close(rt->rtsp_hd);
1079     return err;
1080 }
1081
1082 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1083                            uint8_t *buf, int buf_size)
1084 {
1085     RTSPState *rt = s->priv_data;
1086     int id, len, i, ret;
1087     RTSPStream *rtsp_st;
1088
1089 #ifdef DEBUG_RTP_TCP
1090     printf("tcp_read_packet:\n");
1091 #endif
1092  redo:
1093     for(;;) {
1094         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1095 #ifdef DEBUG_RTP_TCP
1096         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1097 #endif
1098         if (ret != 1)
1099             return -1;
1100         if (buf[0] == '$')
1101             break;
1102     }
1103     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1104     if (ret != 3)
1105         return -1;
1106     id = buf[0];
1107     len = AV_RB16(buf + 1);
1108 #ifdef DEBUG_RTP_TCP
1109     printf("id=%d len=%d\n", id, len);
1110 #endif
1111     if (len > buf_size || len < 12)
1112         goto redo;
1113     /* get the data */
1114     ret = url_readbuf(rt->rtsp_hd, buf, len);
1115     if (ret != len)
1116         return -1;
1117
1118     /* find the matching stream */
1119     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1120         rtsp_st = rt->rtsp_streams[i];
1121         if (id >= rtsp_st->interleaved_min &&
1122             id <= rtsp_st->interleaved_max)
1123             goto found;
1124     }
1125     goto redo;
1126  found:
1127     *prtsp_st = rtsp_st;
1128     return len;
1129 }
1130
1131 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1132                            uint8_t *buf, int buf_size)
1133 {
1134     RTSPState *rt = s->priv_data;
1135     RTSPStream *rtsp_st;
1136     fd_set rfds;
1137     int fd1, fd2, fd_max, n, i, ret;
1138     struct timeval tv;
1139
1140     for(;;) {
1141         if (url_interrupt_cb())
1142             return AVERROR(EINTR);
1143         FD_ZERO(&rfds);
1144         fd_max = -1;
1145         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1146             rtsp_st = rt->rtsp_streams[i];
1147             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1148             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1149             if (fd1 > fd_max)
1150                 fd_max = fd1;
1151             FD_SET(fd1, &rfds);
1152         }
1153         tv.tv_sec = 0;
1154         tv.tv_usec = 100 * 1000;
1155         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1156         if (n > 0) {
1157             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1158                 rtsp_st = rt->rtsp_streams[i];
1159                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1160                 if (FD_ISSET(fd1, &rfds)) {
1161                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1162                     if (ret > 0) {
1163                         *prtsp_st = rtsp_st;
1164                         return ret;
1165                     }
1166                 }
1167             }
1168         }
1169     }
1170 }
1171
1172 static int rtsp_read_packet(AVFormatContext *s,
1173                             AVPacket *pkt)
1174 {
1175     RTSPState *rt = s->priv_data;
1176     RTSPStream *rtsp_st;
1177     int ret, len;
1178     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1179
1180     /* get next frames from the same RTP packet */
1181     if (rt->cur_rtp) {
1182         ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1183         if (ret == 0) {
1184             rt->cur_rtp = NULL;
1185             return 0;
1186         } else if (ret == 1) {
1187             return 0;
1188         } else {
1189             rt->cur_rtp = NULL;
1190         }
1191     }
1192
1193     /* read next RTP packet */
1194  redo:
1195     switch(rt->protocol) {
1196     default:
1197     case RTSP_PROTOCOL_RTP_TCP:
1198         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1199         break;
1200     case RTSP_PROTOCOL_RTP_UDP:
1201     case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1202         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1203         if (len >=0 && rtsp_st->rtp_ctx)
1204             rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1205         break;
1206     }
1207     if (len < 0)
1208         return len;
1209     ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1210     if (ret < 0)
1211         goto redo;
1212     if (ret == 1) {
1213         /* more packets may follow, so we save the RTP context */
1214         rt->cur_rtp = rtsp_st->rtp_ctx;
1215     }
1216     return 0;
1217 }
1218
1219 static int rtsp_read_play(AVFormatContext *s)
1220 {
1221     RTSPState *rt = s->priv_data;
1222     RTSPHeader reply1, *reply = &reply1;
1223     char cmd[1024];
1224
1225     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1226
1227     if (rt->state == RTSP_STATE_PAUSED) {
1228         snprintf(cmd, sizeof(cmd),
1229                  "PLAY %s RTSP/1.0\r\n",
1230                  s->filename);
1231     } else {
1232         snprintf(cmd, sizeof(cmd),
1233                  "PLAY %s RTSP/1.0\r\n"
1234                  "Range: npt=%0.3f-\r\n",
1235                  s->filename,
1236                  (double)rt->seek_timestamp / AV_TIME_BASE);
1237     }
1238     rtsp_send_cmd(s, cmd, reply, NULL);
1239     if (reply->status_code != RTSP_STATUS_OK) {
1240         return -1;
1241     } else {
1242         rt->state = RTSP_STATE_PLAYING;
1243         return 0;
1244     }
1245 }
1246
1247 /* pause the stream */
1248 static int rtsp_read_pause(AVFormatContext *s)
1249 {
1250     RTSPState *rt = s->priv_data;
1251     RTSPHeader reply1, *reply = &reply1;
1252     char cmd[1024];
1253
1254     rt = s->priv_data;
1255
1256     if (rt->state != RTSP_STATE_PLAYING)
1257         return 0;
1258
1259     snprintf(cmd, sizeof(cmd),
1260              "PAUSE %s RTSP/1.0\r\n",
1261              s->filename);
1262     rtsp_send_cmd(s, cmd, reply, NULL);
1263     if (reply->status_code != RTSP_STATUS_OK) {
1264         return -1;
1265     } else {
1266         rt->state = RTSP_STATE_PAUSED;
1267         return 0;
1268     }
1269 }
1270
1271 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1272                           int64_t timestamp, int flags)
1273 {
1274     RTSPState *rt = s->priv_data;
1275
1276     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1277     switch(rt->state) {
1278     default:
1279     case RTSP_STATE_IDLE:
1280         break;
1281     case RTSP_STATE_PLAYING:
1282         if (rtsp_read_play(s) != 0)
1283             return -1;
1284         break;
1285     case RTSP_STATE_PAUSED:
1286         rt->state = RTSP_STATE_IDLE;
1287         break;
1288     }
1289     return 0;
1290 }
1291
1292 static int rtsp_read_close(AVFormatContext *s)
1293 {
1294     RTSPState *rt = s->priv_data;
1295     RTSPHeader reply1, *reply = &reply1;
1296     char cmd[1024];
1297
1298 #if 0
1299     /* NOTE: it is valid to flush the buffer here */
1300     if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1301         url_fclose(&rt->rtsp_gb);
1302     }
1303 #endif
1304     snprintf(cmd, sizeof(cmd),
1305              "TEARDOWN %s RTSP/1.0\r\n",
1306              s->filename);
1307     rtsp_send_cmd(s, cmd, reply, NULL);
1308
1309     rtsp_close_streams(rt);
1310     url_close(rt->rtsp_hd);
1311     return 0;
1312 }
1313
1314 #ifdef CONFIG_RTSP_DEMUXER
1315 AVInputFormat rtsp_demuxer = {
1316     "rtsp",
1317     "RTSP input format",
1318     sizeof(RTSPState),
1319     rtsp_probe,
1320     rtsp_read_header,
1321     rtsp_read_packet,
1322     rtsp_read_close,
1323     rtsp_read_seek,
1324     .flags = AVFMT_NOFILE,
1325     .read_play = rtsp_read_play,
1326     .read_pause = rtsp_read_pause,
1327 };
1328 #endif
1329
1330 static int sdp_probe(AVProbeData *p1)
1331 {
1332     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1333
1334     /* we look for a line beginning "c=IN IP4" */
1335     while (p < p_end && *p != '\0') {
1336         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1337             return AVPROBE_SCORE_MAX / 2;
1338
1339         while(p < p_end - 1 && *p != '\n') p++;
1340         if (++p >= p_end)
1341             break;
1342         if (*p == '\r')
1343             p++;
1344     }
1345     return 0;
1346 }
1347
1348 #define SDP_MAX_SIZE 8192
1349
1350 static int sdp_read_header(AVFormatContext *s,
1351                            AVFormatParameters *ap)
1352 {
1353     RTSPState *rt = s->priv_data;
1354     RTSPStream *rtsp_st;
1355     int size, i, err;
1356     char *content;
1357     char url[1024];
1358     AVStream *st;
1359
1360     /* read the whole sdp file */
1361     /* XXX: better loading */
1362     content = av_malloc(SDP_MAX_SIZE);
1363     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1364     if (size <= 0) {
1365         av_free(content);
1366         return AVERROR_INVALIDDATA;
1367     }
1368     content[size] ='\0';
1369
1370     sdp_parse(s, content);
1371     av_free(content);
1372
1373     /* open each RTP stream */
1374     for(i=0;i<rt->nb_rtsp_streams;i++) {
1375         rtsp_st = rt->rtsp_streams[i];
1376
1377         snprintf(url, sizeof(url), "rtp://%s:%d?multicast=1&ttl=%d",
1378                  inet_ntoa(rtsp_st->sdp_ip),
1379                  rtsp_st->sdp_port,
1380                  rtsp_st->sdp_ttl);
1381         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1382             err = AVERROR_INVALIDDATA;
1383             goto fail;
1384         }
1385         /* open the RTP context */
1386         st = NULL;
1387         if (rtsp_st->stream_index >= 0)
1388             st = s->streams[rtsp_st->stream_index];
1389         if (!st)
1390             s->ctx_flags |= AVFMTCTX_NOHEADER;
1391         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1392         if (!rtsp_st->rtp_ctx) {
1393             err = AVERROR(ENOMEM);
1394             goto fail;
1395         } else {
1396             if(rtsp_st->dynamic_handler) {
1397                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1398                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1399             }
1400         }
1401     }
1402     return 0;
1403  fail:
1404     rtsp_close_streams(rt);
1405     return err;
1406 }
1407
1408 static int sdp_read_packet(AVFormatContext *s,
1409                             AVPacket *pkt)
1410 {
1411     return rtsp_read_packet(s, pkt);
1412 }
1413
1414 static int sdp_read_close(AVFormatContext *s)
1415 {
1416     RTSPState *rt = s->priv_data;
1417     rtsp_close_streams(rt);
1418     return 0;
1419 }
1420
1421 #ifdef CONFIG_SDP_DEMUXER
1422 AVInputFormat sdp_demuxer = {
1423     "sdp",
1424     "SDP",
1425     sizeof(RTSPState),
1426     sdp_probe,
1427     sdp_read_header,
1428     sdp_read_packet,
1429     sdp_read_close,
1430 };
1431 #endif
1432
1433 #ifdef CONFIG_REDIR_DEMUXER
1434 /* dummy redirector format (used directly in av_open_input_file now) */
1435 static int redir_probe(AVProbeData *pd)
1436 {
1437     const char *p;
1438     p = pd->buf;
1439     while (redir_isspace(*p))
1440         p++;
1441     if (av_strstart(p, "http://", NULL) ||
1442         av_strstart(p, "rtsp://", NULL))
1443         return AVPROBE_SCORE_MAX;
1444     return 0;
1445 }
1446
1447 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1448 {
1449     char buf[4096], *q;
1450     int c;
1451     AVFormatContext *ic = NULL;
1452     ByteIOContext *f = s->pb;
1453
1454     /* parse each URL and try to open it */
1455     c = url_fgetc(f);
1456     while (c != URL_EOF) {
1457         /* skip spaces */
1458         for(;;) {
1459             if (!redir_isspace(c))
1460                 break;
1461             c = url_fgetc(f);
1462         }
1463         if (c == URL_EOF)
1464             break;
1465         /* record url */
1466         q = buf;
1467         for(;;) {
1468             if (c == URL_EOF || redir_isspace(c))
1469                 break;
1470             if ((q - buf) < sizeof(buf) - 1)
1471                 *q++ = c;
1472             c = url_fgetc(f);
1473         }
1474         *q = '\0';
1475         //printf("URL='%s'\n", buf);
1476         /* try to open the media file */
1477         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1478             break;
1479     }
1480     if (!ic)
1481         return AVERROR(EIO);
1482
1483     *s = *ic;
1484     url_fclose(f);
1485
1486     return 0;
1487 }
1488
1489 AVInputFormat redir_demuxer = {
1490     "redir",
1491     "Redirector format",
1492     0,
1493     redir_probe,
1494     redir_read_header,
1495     NULL,
1496     NULL,
1497 };
1498 #endif