libavformat/rtsp.c

   1 /*
   2  * RTSP/SDP client
   3  * Copyright (c) 2002 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /* needed by inet_aton() */
  23 #define _SVID_SOURCE
  24
  25 #include "libavutil/avstring.h"
  26 #include "avformat.h"
  27
  28 #include <sys/time.h>
  29 #include <unistd.h> /* for select() prototype */
  30 #include <strings.h>
  31 #include "network.h"
  32 #include "rtsp.h"
  33
  34 #include "rtp_internal.h"
  35 #include "rdt.h"
  36
  37 //#define DEBUG
  38 //#define DEBUG_RTP_TCP
  39
  40 enum RTSPClientState {
  41     RTSP_STATE_IDLE,
  42     RTSP_STATE_PLAYING,
  43     RTSP_STATE_PAUSED,
  44 };
  45
  46 enum RTSPServerType {
  47     RTSP_SERVER_RTP, /*< Standard-compliant RTP-server */
  48     RTSP_SERVER_RDT, /*< Realmedia-style server */
  49     RTSP_SERVER_LAST
  50 };
  51
  52 typedef struct RTSPState {
  53     URLContext *rtsp_hd; /* RTSP TCP connexion handle */
  54     int nb_rtsp_streams;
  55     struct RTSPStream **rtsp_streams;
  56
  57     enum RTSPClientState state;
  58     int64_t seek_timestamp;
  59
  60     /* XXX: currently we use unbuffered input */
  61     //    ByteIOContext rtsp_gb;
  62     int seq;        /* RTSP command sequence number */
  63     char session_id[512];
  64     enum RTSPProtocol protocol;
  65     enum RTSPServerType server_type;
  66     char last_reply[2048]; /* XXX: allocate ? */
  67     RTPDemuxContext *cur_rtp;
  68     int need_subscription;
  69 } RTSPState;
  70
  71 typedef struct RTSPStream {
  72     URLContext *rtp_handle; /* RTP stream handle */
  73     RTPDemuxContext *rtp_ctx; /* RTP parse context */
  74
  75     int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
  76     int interleaved_min, interleaved_max;  /* interleave ids, if TCP transport */
  77     char control_url[1024]; /* url for this stream (from SDP) */
  78
  79     int sdp_port; /* port (from SDP content - not used in RTSP) */
  80     struct in_addr sdp_ip; /* IP address  (from SDP content - not used in RTSP) */
  81     int sdp_ttl;  /* IP TTL (from SDP content - not used in RTSP) */
  82     int sdp_payload_type; /* payload type - only used in SDP */
  83     rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
  84
  85     RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
  86     void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
  87 } RTSPStream;
  88
  89 static int rtsp_read_play(AVFormatContext *s);
  90
  91 /* XXX: currently, the only way to change the protocols consists in
  92    changing this variable */
  93
  94 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  95 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
  96 #endif
  97
  98 static int rtsp_probe(AVProbeData *p)
  99 {
 100     if (av_strstart(p->filename, "rtsp:", NULL))
 101         return AVPROBE_SCORE_MAX;
 102     return 0;
 103 }
 104
 105 static int redir_isspace(int c)
 106 {
 107     return c == ' ' || c == '\t' || c == '\n' || c == '\r';
 108 }
 109
 110 static void skip_spaces(const char **pp)
 111 {
 112     const char *p;
 113     p = *pp;
 114     while (redir_isspace(*p))
 115         p++;
 116     *pp = p;
 117 }
 118
 119 static void get_word_sep(char *buf, int buf_size, const char *sep,
 120                          const char **pp)
 121 {
 122     const char *p;
 123     char *q;
 124
 125     p = *pp;
 126     if (*p == '/')
 127         p++;
 128     skip_spaces(&p);
 129     q = buf;
 130     while (!strchr(sep, *p) && *p != '\0') {
 131         if ((q - buf) < buf_size - 1)
 132             *q++ = *p;
 133         p++;
 134     }
 135     if (buf_size > 0)
 136         *q = '\0';
 137     *pp = p;
 138 }
 139
 140 static void get_word(char *buf, int buf_size, const char **pp)
 141 {
 142     const char *p;
 143     char *q;
 144
 145     p = *pp;
 146     skip_spaces(&p);
 147     q = buf;
 148     while (!redir_isspace(*p) && *p != '\0') {
 149         if ((q - buf) < buf_size - 1)
 150             *q++ = *p;
 151         p++;
 152     }
 153     if (buf_size > 0)
 154         *q = '\0';
 155     *pp = p;
 156 }
 157
 158 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
 159    params>] */
 160 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
 161 {
 162     char buf[256];
 163     int i;
 164     AVCodec *c;
 165     const char *c_name;
 166
 167     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 168        see if we can handle this kind of payload */
 169     get_word_sep(buf, sizeof(buf), "/", &p);
 170     if (payload_type >= RTP_PT_PRIVATE) {
 171         RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
 172         while(handler) {
 173             if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
 174                 codec->codec_id = handler->codec_id;
 175                 rtsp_st->dynamic_handler= handler;
 176                 if(handler->open) {
 177                     rtsp_st->dynamic_protocol_context= handler->open();
 178                 }
 179                 break;
 180             }
 181             handler= handler->next;
 182         }
 183     } else {
 184         /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
 185         /* search into AVRtpPayloadTypes[] */
 186         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 187     }
 188
 189     c = avcodec_find_decoder(codec->codec_id);
 190     if (c && c->name)
 191         c_name = c->name;
 192     else
 193         c_name = (char *)NULL;
 194
 195     if (c_name) {
 196         get_word_sep(buf, sizeof(buf), "/", &p);
 197         i = atoi(buf);
 198         switch (codec->codec_type) {
 199             case CODEC_TYPE_AUDIO:
 200                 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
 201                 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 202                 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 203                 if (i > 0) {
 204                     codec->sample_rate = i;
 205                     get_word_sep(buf, sizeof(buf), "/", &p);
 206                     i = atoi(buf);
 207                     if (i > 0)
 208                         codec->channels = i;
 209                     // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
 210                     //  frequency.  No problem, but the sample rate is being set here by the sdp line.  Upcoming patch forthcoming. (rdm)
 211                 }
 212                 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
 213                 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
 214                 break;
 215             case CODEC_TYPE_VIDEO:
 216                 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
 217                 break;
 218             default:
 219                 break;
 220         }
 221         return 0;
 222     }
 223
 224     return -1;
 225 }
 226
 227 /* return the length and optionnaly the data */
 228 static int hex_to_data(uint8_t *data, const char *p)
 229 {
 230     int c, len, v;
 231
 232     len = 0;
 233     v = 1;
 234     for(;;) {
 235         skip_spaces(&p);
 236         if (p == '\0')
 237             break;
 238         c = toupper((unsigned char)*p++);
 239         if (c >= '0' && c <= '9')
 240             c = c - '0';
 241         else if (c >= 'A' && c <= 'F')
 242             c = c - 'A' + 10;
 243         else
 244             break;
 245         v = (v << 4) | c;
 246         if (v & 0x100) {
 247             if (data)
 248                 data[len] = v;
 249             len++;
 250             v = 1;
 251         }
 252     }
 253     return len;
 254 }
 255
 256 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
 257 {
 258     switch (codec->codec_id) {
 259         case CODEC_ID_MPEG4:
 260         case CODEC_ID_AAC:
 261             if (!strcmp(attr, "config")) {
 262                 /* decode the hexa encoded parameter */
 263                 int len = hex_to_data(NULL, value);
 264                 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 265                 if (!codec->extradata)
 266                     return;
 267                 codec->extradata_size = len;
 268                 hex_to_data(codec->extradata, value);
 269             }
 270             break;
 271         default:
 272             break;
 273     }
 274     return;
 275 }
 276
 277 typedef struct attrname_map
 278 {
 279     const char *str;
 280     uint16_t type;
 281     uint32_t offset;
 282 } attrname_map_t;
 283
 284 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
 285 #define ATTR_NAME_TYPE_INT 0
 286 #define ATTR_NAME_TYPE_STR 1
 287 static attrname_map_t attr_names[]=
 288 {
 289     {"SizeLength",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
 290     {"IndexLength",      ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
 291     {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
 292     {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
 293     {"StreamType",       ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
 294     {"mode",             ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
 295     {NULL, -1, -1},
 296 };
 297
 298 /** parse the attribute line from the fmtp a line of an sdp resonse.  This is broken out as a function
 299 * because it is used in rtp_h264.c, which is forthcoming.
 300 */
 301 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
 302 {
 303     skip_spaces(p);
 304     if(**p)
 305     {
 306         get_word_sep(attr, attr_size, "=", p);
 307         if (**p == '=')
 308             (*p)++;
 309         get_word_sep(value, value_size, ";", p);
 310         if (**p == ';')
 311             (*p)++;
 312         return 1;
 313     }
 314     return 0;
 315 }
 316
 317 /* parse a SDP line and save stream attributes */
 318 static void sdp_parse_fmtp(AVStream *st, const char *p)
 319 {
 320     char attr[256];
 321     char value[4096];
 322     int i;
 323
 324     RTSPStream *rtsp_st = st->priv_data;
 325     AVCodecContext *codec = st->codec;
 326     rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
 327
 328     /* loop on each attribute */
 329     while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
 330     {
 331         /* grab the codec extra_data from the config parameter of the fmtp line */
 332         sdp_parse_fmtp_config(codec, attr, value);
 333         /* Looking for a known attribute */
 334         for (i = 0; attr_names[i].str; ++i) {
 335             if (!strcasecmp(attr, attr_names[i].str)) {
 336                 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
 337                     *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
 338                 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 339                     *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
 340             }
 341         }
 342     }
 343 }
 344
 345 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
 346  *  and end time.
 347  *  Used for seeking in the rtp stream.
 348  */
 349 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 350 {
 351     char buf[256];
 352
 353     skip_spaces(&p);
 354     if (!av_stristart(p, "npt=", &p))
 355         return;
 356
 357     *start = AV_NOPTS_VALUE;
 358     *end = AV_NOPTS_VALUE;
 359
 360     get_word_sep(buf, sizeof(buf), "-", &p);
 361     *start = parse_date(buf, 1);
 362     if (*p == '-') {
 363         p++;
 364         get_word_sep(buf, sizeof(buf), "-", &p);
 365         *end = parse_date(buf, 1);
 366     }
 367 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 368 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 369 }
 370
 371 typedef struct SDPParseState {
 372     /* SDP only */
 373     struct in_addr default_ip;
 374     int default_ttl;
 375 } SDPParseState;
 376
 377 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 378                            int letter, const char *buf)
 379 {
 380     RTSPState *rt = s->priv_data;
 381     char buf1[64], st_type[64];
 382     const char *p;
 383     int codec_type, payload_type, i;
 384     AVStream *st;
 385     RTSPStream *rtsp_st;
 386     struct in_addr sdp_ip;
 387     int ttl;
 388
 389 #ifdef DEBUG
 390     printf("sdp: %c='%s'\n", letter, buf);
 391 #endif
 392
 393     p = buf;
 394     switch(letter) {
 395     case 'c':
 396         get_word(buf1, sizeof(buf1), &p);
 397         if (strcmp(buf1, "IN") != 0)
 398             return;
 399         get_word(buf1, sizeof(buf1), &p);
 400         if (strcmp(buf1, "IP4") != 0)
 401             return;
 402         get_word_sep(buf1, sizeof(buf1), "/", &p);
 403         if (inet_aton(buf1, &sdp_ip) == 0)
 404             return;
 405         ttl = 16;
 406         if (*p == '/') {
 407             p++;
 408             get_word_sep(buf1, sizeof(buf1), "/", &p);
 409             ttl = atoi(buf1);
 410         }
 411         if (s->nb_streams == 0) {
 412             s1->default_ip = sdp_ip;
 413             s1->default_ttl = ttl;
 414         } else {
 415             st = s->streams[s->nb_streams - 1];
 416             rtsp_st = st->priv_data;
 417             rtsp_st->sdp_ip = sdp_ip;
 418             rtsp_st->sdp_ttl = ttl;
 419         }
 420         break;
 421     case 's':
 422         av_strlcpy(s->title, p, sizeof(s->title));
 423         break;
 424     case 'i':
 425         if (s->nb_streams == 0) {
 426             av_strlcpy(s->comment, p, sizeof(s->comment));
 427             break;
 428         }
 429         break;
 430     case 'm':
 431         /* new stream */
 432         get_word(st_type, sizeof(st_type), &p);
 433         if (!strcmp(st_type, "audio")) {
 434             codec_type = CODEC_TYPE_AUDIO;
 435         } else if (!strcmp(st_type, "video")) {
 436             codec_type = CODEC_TYPE_VIDEO;
 437         } else {
 438             return;
 439         }
 440         rtsp_st = av_mallocz(sizeof(RTSPStream));
 441         if (!rtsp_st)
 442             return;
 443         rtsp_st->stream_index = -1;
 444         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 445
 446         rtsp_st->sdp_ip = s1->default_ip;
 447         rtsp_st->sdp_ttl = s1->default_ttl;
 448
 449         get_word(buf1, sizeof(buf1), &p); /* port */
 450         rtsp_st->sdp_port = atoi(buf1);
 451
 452         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 453
 454         /* XXX: handle list of formats */
 455         get_word(buf1, sizeof(buf1), &p); /* format list */
 456         rtsp_st->sdp_payload_type = atoi(buf1);
 457
 458         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 459             /* no corresponding stream */
 460         } else {
 461             st = av_new_stream(s, 0);
 462             if (!st)
 463                 return;
 464             st->priv_data = rtsp_st;
 465             rtsp_st->stream_index = st->index;
 466             st->codec->codec_type = codec_type;
 467             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 468                 /* if standard payload type, we can find the codec right now */
 469                 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 470             }
 471         }
 472         /* put a default control url */
 473         av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
 474         break;
 475     case 'a':
 476         if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
 477             char proto[32];
 478             /* get the control url */
 479             st = s->streams[s->nb_streams - 1];
 480             rtsp_st = st->priv_data;
 481
 482             /* XXX: may need to add full url resolution */
 483             url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
 484             if (proto[0] == '\0') {
 485                 /* relative control URL */
 486                 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
 487                 av_strlcat(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 488             } else {
 489                 av_strlcpy(rtsp_st->control_url, p,   sizeof(rtsp_st->control_url));
 490             }
 491         } else if (av_strstart(p, "rtpmap:", &p)) {
 492             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 493             get_word(buf1, sizeof(buf1), &p);
 494             payload_type = atoi(buf1);
 495             for(i = 0; i < s->nb_streams;i++) {
 496                 st = s->streams[i];
 497                 rtsp_st = st->priv_data;
 498                 if (rtsp_st->sdp_payload_type == payload_type) {
 499                     sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
 500                 }
 501             }
 502         } else if (av_strstart(p, "fmtp:", &p)) {
 503             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 504             get_word(buf1, sizeof(buf1), &p);
 505             payload_type = atoi(buf1);
 506             for(i = 0; i < s->nb_streams;i++) {
 507                 st = s->streams[i];
 508                 rtsp_st = st->priv_data;
 509                 if (rtsp_st->sdp_payload_type == payload_type) {
 510                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 511                         if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
 512                             sdp_parse_fmtp(st, p);
 513                         }
 514                     } else {
 515                         sdp_parse_fmtp(st, p);
 516                     }
 517                 }
 518             }
 519         } else if(av_strstart(p, "framesize:", &p)) {
 520             // let dynamic protocol handlers have a stab at the line.
 521             get_word(buf1, sizeof(buf1), &p);
 522             payload_type = atoi(buf1);
 523             for(i = 0; i < s->nb_streams;i++) {
 524                 st = s->streams[i];
 525                 rtsp_st = st->priv_data;
 526                 if (rtsp_st->sdp_payload_type == payload_type) {
 527                     if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
 528                         rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
 529                     }
 530                 }
 531             }
 532         } else if(av_strstart(p, "range:", &p)) {
 533             int64_t start, end;
 534
 535             // this is so that seeking on a streamed file can work.
 536             rtsp_parse_range_npt(p, &start, &end);
 537             s->start_time= start;
 538             s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
 539         } else if (s->nb_streams > 0) {
 540             rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 541             if (rtsp_st->dynamic_handler &&
 542                 rtsp_st->dynamic_handler->parse_sdp_a_line)
 543                 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
 544                     rtsp_st->dynamic_protocol_context, buf);
 545         }
 546         break;
 547     }
 548 }
 549
 550 static int sdp_parse(AVFormatContext *s, const char *content)
 551 {
 552     const char *p;
 553     int letter;
 554     char buf[2048], *q;
 555     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 556
 557     memset(s1, 0, sizeof(SDPParseState));
 558     p = content;
 559     for(;;) {
 560         skip_spaces(&p);
 561         letter = *p;
 562         if (letter == '\0')
 563             break;
 564         p++;
 565         if (*p != '=')
 566             goto next_line;
 567         p++;
 568         /* get the content */
 569         q = buf;
 570         while (*p != '\n' && *p != '\r' && *p != '\0') {
 571             if ((q - buf) < sizeof(buf) - 1)
 572                 *q++ = *p;
 573             p++;
 574         }
 575         *q = '\0';
 576         sdp_parse_line(s, s1, letter, buf);
 577     next_line:
 578         while (*p != '\n' && *p != '\0')
 579             p++;
 580         if (*p == '\n')
 581             p++;
 582     }
 583     return 0;
 584 }
 585
 586 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 587 {
 588     const char *p;
 589     int v;
 590
 591     p = *pp;
 592     skip_spaces(&p);
 593     v = strtol(p, (char **)&p, 10);
 594     if (*p == '-') {
 595         p++;
 596         *min_ptr = v;
 597         v = strtol(p, (char **)&p, 10);
 598         *max_ptr = v;
 599     } else {
 600         *min_ptr = v;
 601         *max_ptr = v;
 602     }
 603     *pp = p;
 604 }
 605
 606 /* XXX: only one transport specification is parsed */
 607 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
 608 {
 609     char transport_protocol[16];
 610     char profile[16];
 611     char lower_transport[16];
 612     char parameter[16];
 613     RTSPTransportField *th;
 614     char buf[256];
 615
 616     reply->nb_transports = 0;
 617
 618     for(;;) {
 619         skip_spaces(&p);
 620         if (*p == '\0')
 621             break;
 622
 623         th = &reply->transports[reply->nb_transports];
 624
 625         get_word_sep(transport_protocol, sizeof(transport_protocol),
 626                      "/", &p);
 627         if (*p == '/')
 628             p++;
 629         if (!strcasecmp (transport_protocol, "rtp")) {
 630             get_word_sep(profile, sizeof(profile), "/;,", &p);
 631             lower_transport[0] = '\0';
 632             /* rtp/avp/<protocol> */
 633             if (*p == '/') {
 634                 p++;
 635                 get_word_sep(lower_transport, sizeof(lower_transport),
 636                              ";,", &p);
 637                 }
 638         } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
 639             /* x-pn-tng/<protocol> */
 640             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 641             profile[0] = '\0';
 642         }
 643         if (!strcasecmp(lower_transport, "TCP"))
 644             th->protocol = RTSP_PROTOCOL_RTP_TCP;
 645         else
 646             th->protocol = RTSP_PROTOCOL_RTP_UDP;
 647
 648         if (*p == ';')
 649             p++;
 650         /* get each parameter */
 651         while (*p != '\0' && *p != ',') {
 652             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 653             if (!strcmp(parameter, "port")) {
 654                 if (*p == '=') {
 655                     p++;
 656                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 657                 }
 658             } else if (!strcmp(parameter, "client_port")) {
 659                 if (*p == '=') {
 660                     p++;
 661                     rtsp_parse_range(&th->client_port_min,
 662                                      &th->client_port_max, &p);
 663                 }
 664             } else if (!strcmp(parameter, "server_port")) {
 665                 if (*p == '=') {
 666                     p++;
 667                     rtsp_parse_range(&th->server_port_min,
 668                                      &th->server_port_max, &p);
 669                 }
 670             } else if (!strcmp(parameter, "interleaved")) {
 671                 if (*p == '=') {
 672                     p++;
 673                     rtsp_parse_range(&th->interleaved_min,
 674                                      &th->interleaved_max, &p);
 675                 }
 676             } else if (!strcmp(parameter, "multicast")) {
 677                 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
 678                     th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
 679             } else if (!strcmp(parameter, "ttl")) {
 680                 if (*p == '=') {
 681                     p++;
 682                     th->ttl = strtol(p, (char **)&p, 10);
 683                 }
 684             } else if (!strcmp(parameter, "destination")) {
 685                 struct in_addr ipaddr;
 686
 687                 if (*p == '=') {
 688                     p++;
 689                     get_word_sep(buf, sizeof(buf), ";,", &p);
 690                     if (inet_aton(buf, &ipaddr))
 691                         th->destination = ntohl(ipaddr.s_addr);
 692                 }
 693             }
 694             while (*p != ';' && *p != '\0' && *p != ',')
 695                 p++;
 696             if (*p == ';')
 697                 p++;
 698         }
 699         if (*p == ',')
 700             p++;
 701
 702         reply->nb_transports++;
 703     }
 704 }
 705
 706 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
 707 {
 708     const char *p;
 709
 710     /* NOTE: we do case independent match for broken servers */
 711     p = buf;
 712     if (av_stristart(p, "Session:", &p)) {
 713         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 714     } else if (av_stristart(p, "Content-Length:", &p)) {
 715         reply->content_length = strtol(p, NULL, 10);
 716     } else if (av_stristart(p, "Transport:", &p)) {
 717         rtsp_parse_transport(reply, p);
 718     } else if (av_stristart(p, "CSeq:", &p)) {
 719         reply->seq = strtol(p, NULL, 10);
 720     } else if (av_stristart(p, "Range:", &p)) {
 721         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 722     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 723         skip_spaces(&p);
 724         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 725     }
 726 }
 727
 728 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
 729 {
 730     int ret, len;
 731
 732     len = 0;
 733     while (len < size) {
 734         ret = url_read(h, buf+len, size-len);
 735         if (ret < 1)
 736             return ret;
 737         len += ret;
 738     }
 739     return len;
 740 }
 741
 742 /* skip a RTP/TCP interleaved packet */
 743 static void rtsp_skip_packet(AVFormatContext *s)
 744 {
 745     RTSPState *rt = s->priv_data;
 746     int ret, len, len1;
 747     uint8_t buf[1024];
 748
 749     ret = url_readbuf(rt->rtsp_hd, buf, 3);
 750     if (ret != 3)
 751         return;
 752     len = AV_RB16(buf + 1);
 753 #ifdef DEBUG
 754     printf("skipping RTP packet len=%d\n", len);
 755 #endif
 756     /* skip payload */
 757     while (len > 0) {
 758         len1 = len;
 759         if (len1 > sizeof(buf))
 760             len1 = sizeof(buf);
 761         ret = url_readbuf(rt->rtsp_hd, buf, len1);
 762         if (ret != len1)
 763             return;
 764         len -= len1;
 765     }
 766 }
 767
 768 static void rtsp_send_cmd(AVFormatContext *s,
 769                           const char *cmd, RTSPHeader *reply,
 770                           unsigned char **content_ptr)
 771 {
 772     RTSPState *rt = s->priv_data;
 773     char buf[4096], buf1[1024], *q;
 774     unsigned char ch;
 775     const char *p;
 776     int content_length, line_count;
 777     unsigned char *content = NULL;
 778
 779     memset(reply, 0, sizeof(RTSPHeader));
 780
 781     rt->seq++;
 782     av_strlcpy(buf, cmd, sizeof(buf));
 783     snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
 784     av_strlcat(buf, buf1, sizeof(buf));
 785     if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
 786         snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
 787         av_strlcat(buf, buf1, sizeof(buf));
 788     }
 789     av_strlcat(buf, "\r\n", sizeof(buf));
 790 #ifdef DEBUG
 791     printf("Sending:\n%s--\n", buf);
 792 #endif
 793     url_write(rt->rtsp_hd, buf, strlen(buf));
 794
 795     /* parse reply (XXX: use buffers) */
 796     line_count = 0;
 797     rt->last_reply[0] = '\0';
 798     for(;;) {
 799         q = buf;
 800         for(;;) {
 801             if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
 802                 break;
 803             if (ch == '\n')
 804                 break;
 805             if (ch == '$') {
 806                 /* XXX: only parse it if first char on line ? */
 807                 rtsp_skip_packet(s);
 808             } else if (ch != '\r') {
 809                 if ((q - buf) < sizeof(buf) - 1)
 810                     *q++ = ch;
 811             }
 812         }
 813         *q = '\0';
 814 #ifdef DEBUG
 815         printf("line='%s'\n", buf);
 816 #endif
 817         /* test if last line */
 818         if (buf[0] == '\0')
 819             break;
 820         p = buf;
 821         if (line_count == 0) {
 822             /* get reply code */
 823             get_word(buf1, sizeof(buf1), &p);
 824             get_word(buf1, sizeof(buf1), &p);
 825             reply->status_code = atoi(buf1);
 826         } else {
 827             rtsp_parse_line(reply, p);
 828             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 829             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 830         }
 831         line_count++;
 832     }
 833
 834     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 835         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 836
 837     content_length = reply->content_length;
 838     if (content_length > 0) {
 839         /* leave some room for a trailing '\0' (useful for simple parsing) */
 840         content = av_malloc(content_length + 1);
 841         (void)url_readbuf(rt->rtsp_hd, content, content_length);
 842         content[content_length] = '\0';
 843     }
 844     if (content_ptr)
 845         *content_ptr = content;
 846     else
 847         av_free(content);
 848 }
 849
 850
 851 /* close and free RTSP streams */
 852 static void rtsp_close_streams(RTSPState *rt)
 853 {
 854     int i;
 855     RTSPStream *rtsp_st;
 856
 857     for(i=0;i<rt->nb_rtsp_streams;i++) {
 858         rtsp_st = rt->rtsp_streams[i];
 859         if (rtsp_st) {
 860             if (rtsp_st->rtp_ctx)
 861                 rtp_parse_close(rtsp_st->rtp_ctx);
 862             if (rtsp_st->rtp_handle)
 863                 url_close(rtsp_st->rtp_handle);
 864             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 865                 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
 866         }
 867     }
 868     av_free(rt->rtsp_streams);
 869 }
 870
 871 /**
 872  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
 873  */
 874 static int
 875 make_setup_request (AVFormatContext *s, const char *host, int port,
 876                     int protocol, const char *real_challenge)
 877 {
 878     RTSPState *rt = s->priv_data;
 879     int j, i, err;
 880     RTSPStream *rtsp_st;
 881     AVStream *st;
 882     RTSPHeader reply1, *reply = &reply1;
 883     char cmd[2048];
 884     const char *trans_pref;
 885
 886     if (rt->server_type == RTSP_SERVER_RDT)
 887         trans_pref = "x-pn-tng";
 888     else
 889         trans_pref = "RTP/AVP";
 890
 891     /* for each stream, make the setup request */
 892     /* XXX: we assume the same server is used for the control of each
 893        RTSP stream */
 894
 895     for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
 896         char transport[2048];
 897
 898         rtsp_st = rt->rtsp_streams[i];
 899
 900         /* RTP/UDP */
 901         if (protocol == RTSP_PROTOCOL_RTP_UDP) {
 902             char buf[256];
 903
 904             /* first try in specified port range */
 905             if (RTSP_RTP_PORT_MIN != 0) {
 906                 while(j <= RTSP_RTP_PORT_MAX) {
 907                     snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
 908                     j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
 909                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
 910                         goto rtp_opened;
 911                     }
 912                 }
 913             }
 914
 915 /*            then try on any port
 916 **            if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
 917 **                err = AVERROR_INVALIDDATA;
 918 **                goto fail;
 919 **            }
 920 */
 921
 922         rtp_opened:
 923             port = rtp_get_local_port(rtsp_st->rtp_handle);
 924             snprintf(transport, sizeof(transport) - 1,
 925                      "%s/UDP;unicast;client_port=%d",
 926                      trans_pref, port);
 927             if (rt->server_type == RTSP_SERVER_RTP)
 928                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
 929         }
 930
 931         /* RTP/TCP */
 932         else if (protocol == RTSP_PROTOCOL_RTP_TCP) {
 933             snprintf(transport, sizeof(transport) - 1,
 934                      "%s/TCP", trans_pref);
 935         }
 936
 937         else if (protocol == RTSP_PROTOCOL_RTP_UDP_MULTICAST) {
 938             snprintf(transport, sizeof(transport) - 1,
 939                      "%s/UDP;multicast", trans_pref);
 940         }
 941         if (rt->server_type == RTSP_SERVER_RDT)
 942             av_strlcat(transport, ";mode=play", sizeof(transport));
 943         snprintf(cmd, sizeof(cmd),
 944                  "SETUP %s RTSP/1.0\r\n"
 945                  "Transport: %s\r\n",
 946                  rtsp_st->control_url, transport);
 947         if (i == 0 && rt->server_type == RTSP_SERVER_RDT) {
 948             char real_res[41], real_csum[9];
 949             ff_rdt_calc_response_and_checksum(real_res, real_csum,
 950                                               real_challenge);
 951             av_strlcatf(cmd, sizeof(cmd),
 952                         "If-Match: %s\r\n"
 953                         "RealChallenge2: %s, sd=%s\r\n",
 954                         rt->session_id, real_res, real_csum);
 955         }
 956         rtsp_send_cmd(s, cmd, reply, NULL);
 957         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
 958             err = 1;
 959             goto fail;
 960         } else if (reply->status_code != RTSP_STATUS_OK ||
 961                    reply->nb_transports != 1) {
 962             err = AVERROR_INVALIDDATA;
 963             goto fail;
 964         }
 965
 966         /* XXX: same protocol for all streams is required */
 967         if (i > 0) {
 968             if (reply->transports[0].protocol != rt->protocol) {
 969                 err = AVERROR_INVALIDDATA;
 970                 goto fail;
 971             }
 972         } else {
 973             rt->protocol = reply->transports[0].protocol;
 974         }
 975
 976         /* close RTP connection if not choosen */
 977         if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
 978             (protocol == RTSP_PROTOCOL_RTP_UDP)) {
 979             url_close(rtsp_st->rtp_handle);
 980             rtsp_st->rtp_handle = NULL;
 981         }
 982
 983         switch(reply->transports[0].protocol) {
 984         case RTSP_PROTOCOL_RTP_TCP:
 985             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
 986             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
 987             break;
 988
 989         case RTSP_PROTOCOL_RTP_UDP:
 990             {
 991                 char url[1024];
 992
 993                 /* XXX: also use address if specified */
 994                 snprintf(url, sizeof(url), "rtp://%s:%d",
 995                          host, reply->transports[0].server_port_min);
 996                 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
 997                     err = AVERROR_INVALIDDATA;
 998                     goto fail;
 999                 }
1000             }
1001             break;
1002         case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1003             {
1004                 char url[1024];
1005                 struct in_addr in;
1006
1007                 in.s_addr = htonl(reply->transports[0].destination);
1008                 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1009                          inet_ntoa(in),
1010                          reply->transports[0].port_min,
1011                          reply->transports[0].ttl);
1012                 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1013                     err = AVERROR_INVALIDDATA;
1014                     goto fail;
1015                 }
1016             }
1017             break;
1018         }
1019         /* open the RTP context */
1020         st = NULL;
1021         if (rtsp_st->stream_index >= 0)
1022             st = s->streams[rtsp_st->stream_index];
1023         if (!st)
1024             s->ctx_flags |= AVFMTCTX_NOHEADER;
1025         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1026
1027         if (!rtsp_st->rtp_ctx) {
1028             err = AVERROR(ENOMEM);
1029             goto fail;
1030         } else {
1031             if(rtsp_st->dynamic_handler) {
1032                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1033                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1034             }
1035         }
1036     }
1037
1038     if (rt->server_type == RTSP_SERVER_RDT)
1039         rt->need_subscription = 1;
1040
1041     return 0;
1042
1043 fail:
1044     for (i=0; i<rt->nb_rtsp_streams; i++) {
1045         if (rt->rtsp_streams[i]->rtp_handle) {
1046             url_close(rt->rtsp_streams[i]->rtp_handle);
1047             rt->rtsp_streams[i]->rtp_handle = NULL;
1048         }
1049     }
1050     return err;
1051 }
1052
1053 static int rtsp_read_header(AVFormatContext *s,
1054                             AVFormatParameters *ap)
1055 {
1056     RTSPState *rt = s->priv_data;
1057     char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1058     URLContext *rtsp_hd;
1059     int port, ret, err;
1060     RTSPHeader reply1, *reply = &reply1;
1061     unsigned char *content = NULL;
1062     int protocol_mask = 0;
1063     char real_challenge[64];
1064
1065     /* extract hostname and port */
1066     url_split(NULL, 0, NULL, 0,
1067               host, sizeof(host), &port, path, sizeof(path), s->filename);
1068     if (port < 0)
1069         port = RTSP_DEFAULT_PORT;
1070
1071     /* search for options */
1072     option_list = strchr(path, '?');
1073     if (option_list) {
1074         /* remove the options from the path */
1075         *option_list++ = 0;
1076         while(option_list) {
1077             /* move the option pointer */
1078             option = option_list;
1079             option_list = strchr(option_list, '&');
1080             if (option_list)
1081                 *(option_list++) = 0;
1082             /* handle the options */
1083             if (strcmp(option, "udp") == 0)
1084                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
1085             else if (strcmp(option, "multicast") == 0)
1086                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
1087             else if (strcmp(option, "tcp") == 0)
1088                 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
1089         }
1090     }
1091
1092     if (!protocol_mask)
1093         protocol_mask = (1 << RTSP_PROTOCOL_RTP_LAST) - 1;
1094
1095     /* open the tcp connexion */
1096     snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1097     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1098         return AVERROR(EIO);
1099     rt->rtsp_hd = rtsp_hd;
1100     rt->seq = 0;
1101
1102     /* request options supported by the server; this also detects server type */
1103     for (rt->server_type = RTSP_SERVER_RTP;;) {
1104         snprintf(cmd, sizeof(cmd),
1105                  "OPTIONS %s RTSP/1.0\r\n", s->filename);
1106         if (rt->server_type == RTSP_SERVER_RDT)
1107             av_strlcat(cmd,
1108                        /**
1109                         * The following entries are required for proper
1110                         * streaming from a Realmedia server. They are
1111                         * interdependent in some way although we currently
1112                         * don't quite understand how. Values were copied
1113                         * from mplayer SVN r23589.
1114                         * @param CompanyID is a 16-byte ID in base64
1115                         * @param ClientChallenge is a 16-byte ID in hex
1116                         */
1117                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1118                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1119                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1120                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1121                        sizeof(cmd));
1122         rtsp_send_cmd(s, cmd, reply, NULL);
1123         if (reply->status_code != RTSP_STATUS_OK) {
1124             err = AVERROR_INVALIDDATA;
1125             goto fail;
1126         }
1127
1128         /* detect server type if not standard-compliant RTP */
1129         if (rt->server_type != RTSP_SERVER_RDT && reply->real_challenge[0]) {
1130             rt->server_type = RTSP_SERVER_RDT;
1131             continue;
1132         } else if (rt->server_type == RTSP_SERVER_RDT) {
1133             strcpy(real_challenge, reply->real_challenge);
1134         }
1135         break;
1136     }
1137
1138     /* describe the stream */
1139     snprintf(cmd, sizeof(cmd),
1140              "DESCRIBE %s RTSP/1.0\r\n"
1141              "Accept: application/sdp\r\n",
1142              s->filename);
1143     if (rt->server_type == RTSP_SERVER_RDT) {
1144         /**
1145          * The Require: attribute is needed for proper streaming from
1146          * Realmedia servers.
1147          */
1148         av_strlcat(cmd,
1149                    "Require: com.real.retain-entity-for-setup\r\n",
1150                    sizeof(cmd));
1151     }
1152     rtsp_send_cmd(s, cmd, reply, &content);
1153     if (!content) {
1154         err = AVERROR_INVALIDDATA;
1155         goto fail;
1156     }
1157     if (reply->status_code != RTSP_STATUS_OK) {
1158         err = AVERROR_INVALIDDATA;
1159         goto fail;
1160     }
1161
1162     /* now we got the SDP description, we parse it */
1163     ret = sdp_parse(s, (const char *)content);
1164     av_freep(&content);
1165     if (ret < 0) {
1166         err = AVERROR_INVALIDDATA;
1167         goto fail;
1168     }
1169
1170     do {
1171         int protocol = ff_log2_tab[protocol_mask & ~(protocol_mask - 1)];
1172
1173         err = make_setup_request(s, host, port, protocol,
1174                                  rt->server_type == RTSP_SERVER_RDT ?
1175                                      real_challenge : NULL);
1176         if (err < 0)
1177             goto fail;
1178         protocol_mask &= ~(1 << protocol);
1179         if (protocol_mask == 0 && err == 1) {
1180             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1181             goto fail;
1182         }
1183     } while (err);
1184
1185     rt->state = RTSP_STATE_IDLE;
1186     rt->seek_timestamp = 0; /* default is to start stream at position
1187                                zero */
1188     if (ap->initial_pause) {
1189         /* do not start immediately */
1190     } else {
1191         if (rtsp_read_play(s) < 0) {
1192             err = AVERROR_INVALIDDATA;
1193             goto fail;
1194         }
1195     }
1196     return 0;
1197  fail:
1198     rtsp_close_streams(rt);
1199     av_freep(&content);
1200     url_close(rt->rtsp_hd);
1201     return err;
1202 }
1203
1204 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1205                            uint8_t *buf, int buf_size)
1206 {
1207     RTSPState *rt = s->priv_data;
1208     int id, len, i, ret;
1209     RTSPStream *rtsp_st;
1210
1211 #ifdef DEBUG_RTP_TCP
1212     printf("tcp_read_packet:\n");
1213 #endif
1214  redo:
1215     for(;;) {
1216         ret = url_readbuf(rt->rtsp_hd, buf, 1);
1217 #ifdef DEBUG_RTP_TCP
1218         printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1219 #endif
1220         if (ret != 1)
1221             return -1;
1222         if (buf[0] == '$')
1223             break;
1224     }
1225     ret = url_readbuf(rt->rtsp_hd, buf, 3);
1226     if (ret != 3)
1227         return -1;
1228     id = buf[0];
1229     len = AV_RB16(buf + 1);
1230 #ifdef DEBUG_RTP_TCP
1231     printf("id=%d len=%d\n", id, len);
1232 #endif
1233     if (len > buf_size || len < 12)
1234         goto redo;
1235     /* get the data */
1236     ret = url_readbuf(rt->rtsp_hd, buf, len);
1237     if (ret != len)
1238         return -1;
1239
1240     /* find the matching stream */
1241     for(i = 0; i < rt->nb_rtsp_streams; i++) {
1242         rtsp_st = rt->rtsp_streams[i];
1243         if (id >= rtsp_st->interleaved_min &&
1244             id <= rtsp_st->interleaved_max)
1245             goto found;
1246     }
1247     goto redo;
1248  found:
1249     *prtsp_st = rtsp_st;
1250     return len;
1251 }
1252
1253 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1254                            uint8_t *buf, int buf_size)
1255 {
1256     RTSPState *rt = s->priv_data;
1257     RTSPStream *rtsp_st;
1258     fd_set rfds;
1259     int fd1, fd2, fd_max, n, i, ret;
1260     struct timeval tv;
1261
1262     for(;;) {
1263         if (url_interrupt_cb())
1264             return AVERROR(EINTR);
1265         FD_ZERO(&rfds);
1266         fd_max = -1;
1267         for(i = 0; i < rt->nb_rtsp_streams; i++) {
1268             rtsp_st = rt->rtsp_streams[i];
1269             /* currently, we cannot probe RTCP handle because of blocking restrictions */
1270             rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1271             if (fd1 > fd_max)
1272                 fd_max = fd1;
1273             FD_SET(fd1, &rfds);
1274         }
1275         tv.tv_sec = 0;
1276         tv.tv_usec = 100 * 1000;
1277         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1278         if (n > 0) {
1279             for(i = 0; i < rt->nb_rtsp_streams; i++) {
1280                 rtsp_st = rt->rtsp_streams[i];
1281                 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1282                 if (FD_ISSET(fd1, &rfds)) {
1283                     ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1284                     if (ret > 0) {
1285                         *prtsp_st = rtsp_st;
1286                         return ret;
1287                     }
1288                 }
1289             }
1290         }
1291     }
1292 }
1293
1294 static int rtsp_read_packet(AVFormatContext *s,
1295                             AVPacket *pkt)
1296 {
1297     RTSPState *rt = s->priv_data;
1298     RTSPStream *rtsp_st;
1299     int ret, len;
1300     uint8_t buf[RTP_MAX_PACKET_LENGTH];
1301
1302     if (rt->server_type == RTSP_SERVER_RDT && rt->need_subscription) {
1303         int i;
1304         RTSPHeader reply1, *reply = &reply1;
1305         char cmd[1024];
1306
1307         snprintf(cmd, sizeof(cmd),
1308                  "SET_PARAMETER %s RTSP/1.0\r\n"
1309                  "Subscribe: ",
1310                  s->filename);
1311         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1312             if (i != 0) av_strlcat(cmd, ",", sizeof(cmd));
1313             ff_rdt_subscribe_rule(
1314                 rt->rtsp_streams[i]->rtp_ctx,
1315                 cmd, sizeof(cmd), i, 0);
1316         }
1317         av_strlcat(cmd, "\r\n", sizeof(cmd));
1318         rtsp_send_cmd(s, cmd, reply, NULL);
1319         if (reply->status_code != RTSP_STATUS_OK)
1320             return AVERROR_INVALIDDATA;
1321         rt->need_subscription = 0;
1322
1323         if (rt->state == RTSP_STATE_PLAYING)
1324             rtsp_read_play (s);
1325     }
1326
1327     /* get next frames from the same RTP packet */
1328     if (rt->cur_rtp) {
1329         if (rt->server_type == RTSP_SERVER_RDT)
1330             ret = ff_rdt_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1331         else
1332             ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1333         if (ret == 0) {
1334             rt->cur_rtp = NULL;
1335             return 0;
1336         } else if (ret == 1) {
1337             return 0;
1338         } else {
1339             rt->cur_rtp = NULL;
1340         }
1341     }
1342
1343     /* read next RTP packet */
1344  redo:
1345     switch(rt->protocol) {
1346     default:
1347     case RTSP_PROTOCOL_RTP_TCP:
1348         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1349         break;
1350     case RTSP_PROTOCOL_RTP_UDP:
1351     case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1352         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1353         if (len >=0 && rtsp_st->rtp_ctx)
1354             rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1355         break;
1356     }
1357     if (len < 0)
1358         return len;
1359     if (rt->server_type == RTSP_SERVER_RDT)
1360         ret = ff_rdt_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1361     else
1362         ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1363     if (ret < 0)
1364         goto redo;
1365     if (ret == 1) {
1366         /* more packets may follow, so we save the RTP context */
1367         rt->cur_rtp = rtsp_st->rtp_ctx;
1368     }
1369     return 0;
1370 }
1371
1372 static int rtsp_read_play(AVFormatContext *s)
1373 {
1374     RTSPState *rt = s->priv_data;
1375     RTSPHeader reply1, *reply = &reply1;
1376     char cmd[1024];
1377
1378     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1379
1380     if (!(rt->server_type == RTSP_SERVER_RDT && rt->need_subscription)) {
1381         if (rt->state == RTSP_STATE_PAUSED) {
1382             snprintf(cmd, sizeof(cmd),
1383                      "PLAY %s RTSP/1.0\r\n",
1384                      s->filename);
1385         } else {
1386             snprintf(cmd, sizeof(cmd),
1387                      "PLAY %s RTSP/1.0\r\n"
1388                      "Range: npt=%0.3f-\r\n",
1389                      s->filename,
1390                      (double)rt->seek_timestamp / AV_TIME_BASE);
1391         }
1392         rtsp_send_cmd(s, cmd, reply, NULL);
1393         if (reply->status_code != RTSP_STATUS_OK) {
1394             return -1;
1395         }
1396     }
1397     rt->state = RTSP_STATE_PLAYING;
1398     return 0;
1399 }
1400
1401 /* pause the stream */
1402 static int rtsp_read_pause(AVFormatContext *s)
1403 {
1404     RTSPState *rt = s->priv_data;
1405     RTSPHeader reply1, *reply = &reply1;
1406     char cmd[1024];
1407
1408     rt = s->priv_data;
1409
1410     if (rt->state != RTSP_STATE_PLAYING)
1411         return 0;
1412     else if (!(rt->server_type == RTSP_SERVER_RDT && rt->need_subscription)) {
1413         snprintf(cmd, sizeof(cmd),
1414                  "PAUSE %s RTSP/1.0\r\n",
1415                  s->filename);
1416         rtsp_send_cmd(s, cmd, reply, NULL);
1417         if (reply->status_code != RTSP_STATUS_OK) {
1418             return -1;
1419         }
1420     }
1421     rt->state = RTSP_STATE_PAUSED;
1422     return 0;
1423 }
1424
1425 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1426                           int64_t timestamp, int flags)
1427 {
1428     RTSPState *rt = s->priv_data;
1429
1430     rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1431     switch(rt->state) {
1432     default:
1433     case RTSP_STATE_IDLE:
1434         break;
1435     case RTSP_STATE_PLAYING:
1436         if (rtsp_read_play(s) != 0)
1437             return -1;
1438         break;
1439     case RTSP_STATE_PAUSED:
1440         rt->state = RTSP_STATE_IDLE;
1441         break;
1442     }
1443     return 0;
1444 }
1445
1446 static int rtsp_read_close(AVFormatContext *s)
1447 {
1448     RTSPState *rt = s->priv_data;
1449     RTSPHeader reply1, *reply = &reply1;
1450     char cmd[1024];
1451
1452 #if 0
1453     /* NOTE: it is valid to flush the buffer here */
1454     if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1455         url_fclose(&rt->rtsp_gb);
1456     }
1457 #endif
1458     snprintf(cmd, sizeof(cmd),
1459              "TEARDOWN %s RTSP/1.0\r\n",
1460              s->filename);
1461     rtsp_send_cmd(s, cmd, reply, NULL);
1462
1463     rtsp_close_streams(rt);
1464     url_close(rt->rtsp_hd);
1465     return 0;
1466 }
1467
1468 #ifdef CONFIG_RTSP_DEMUXER
1469 AVInputFormat rtsp_demuxer = {
1470     "rtsp",
1471     NULL_IF_CONFIG_SMALL("RTSP input format"),
1472     sizeof(RTSPState),
1473     rtsp_probe,
1474     rtsp_read_header,
1475     rtsp_read_packet,
1476     rtsp_read_close,
1477     rtsp_read_seek,
1478     .flags = AVFMT_NOFILE,
1479     .read_play = rtsp_read_play,
1480     .read_pause = rtsp_read_pause,
1481 };
1482 #endif
1483
1484 static int sdp_probe(AVProbeData *p1)
1485 {
1486     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1487
1488     /* we look for a line beginning "c=IN IP4" */
1489     while (p < p_end && *p != '\0') {
1490         if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1491             return AVPROBE_SCORE_MAX / 2;
1492
1493         while(p < p_end - 1 && *p != '\n') p++;
1494         if (++p >= p_end)
1495             break;
1496         if (*p == '\r')
1497             p++;
1498     }
1499     return 0;
1500 }
1501
1502 #define SDP_MAX_SIZE 8192
1503
1504 static int sdp_read_header(AVFormatContext *s,
1505                            AVFormatParameters *ap)
1506 {
1507     RTSPState *rt = s->priv_data;
1508     RTSPStream *rtsp_st;
1509     int size, i, err;
1510     char *content;
1511     char url[1024];
1512     AVStream *st;
1513
1514     /* read the whole sdp file */
1515     /* XXX: better loading */
1516     content = av_malloc(SDP_MAX_SIZE);
1517     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1518     if (size <= 0) {
1519         av_free(content);
1520         return AVERROR_INVALIDDATA;
1521     }
1522     content[size] ='\0';
1523
1524     sdp_parse(s, content);
1525     av_free(content);
1526
1527     /* open each RTP stream */
1528     for(i=0;i<rt->nb_rtsp_streams;i++) {
1529         rtsp_st = rt->rtsp_streams[i];
1530
1531         snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1532                  inet_ntoa(rtsp_st->sdp_ip),
1533                  rtsp_st->sdp_port,
1534                  rtsp_st->sdp_port,
1535                  rtsp_st->sdp_ttl);
1536         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1537             err = AVERROR_INVALIDDATA;
1538             goto fail;
1539         }
1540         /* open the RTP context */
1541         st = NULL;
1542         if (rtsp_st->stream_index >= 0)
1543             st = s->streams[rtsp_st->stream_index];
1544         if (!st)
1545             s->ctx_flags |= AVFMTCTX_NOHEADER;
1546         rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1547         if (!rtsp_st->rtp_ctx) {
1548             err = AVERROR(ENOMEM);
1549             goto fail;
1550         } else {
1551             if(rtsp_st->dynamic_handler) {
1552                 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1553                 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1554             }
1555         }
1556     }
1557     return 0;
1558  fail:
1559     rtsp_close_streams(rt);
1560     return err;
1561 }
1562
1563 static int sdp_read_packet(AVFormatContext *s,
1564                             AVPacket *pkt)
1565 {
1566     return rtsp_read_packet(s, pkt);
1567 }
1568
1569 static int sdp_read_close(AVFormatContext *s)
1570 {
1571     RTSPState *rt = s->priv_data;
1572     rtsp_close_streams(rt);
1573     return 0;
1574 }
1575
1576 #ifdef CONFIG_SDP_DEMUXER
1577 AVInputFormat sdp_demuxer = {
1578     "sdp",
1579     NULL_IF_CONFIG_SMALL("SDP"),
1580     sizeof(RTSPState),
1581     sdp_probe,
1582     sdp_read_header,
1583     sdp_read_packet,
1584     sdp_read_close,
1585 };
1586 #endif
1587
1588 #ifdef CONFIG_REDIR_DEMUXER
1589 /* dummy redirector format (used directly in av_open_input_file now) */
1590 static int redir_probe(AVProbeData *pd)
1591 {
1592     const char *p;
1593     p = pd->buf;
1594     while (redir_isspace(*p))
1595         p++;
1596     if (av_strstart(p, "http://", NULL) ||
1597         av_strstart(p, "rtsp://", NULL))
1598         return AVPROBE_SCORE_MAX;
1599     return 0;
1600 }
1601
1602 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1603 {
1604     char buf[4096], *q;
1605     int c;
1606     AVFormatContext *ic = NULL;
1607     ByteIOContext *f = s->pb;
1608
1609     /* parse each URL and try to open it */
1610     c = url_fgetc(f);
1611     while (c != URL_EOF) {
1612         /* skip spaces */
1613         for(;;) {
1614             if (!redir_isspace(c))
1615                 break;
1616             c = url_fgetc(f);
1617         }
1618         if (c == URL_EOF)
1619             break;
1620         /* record url */
1621         q = buf;
1622         for(;;) {
1623             if (c == URL_EOF || redir_isspace(c))
1624                 break;
1625             if ((q - buf) < sizeof(buf) - 1)
1626                 *q++ = c;
1627             c = url_fgetc(f);
1628         }
1629         *q = '\0';
1630         //printf("URL='%s'\n", buf);
1631         /* try to open the media file */
1632         if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1633             break;
1634     }
1635     if (!ic)
1636         return AVERROR(EIO);
1637
1638     *s = *ic;
1639     url_fclose(f);
1640
1641     return 0;
1642 }
1643
1644 AVInputFormat redir_demuxer = {
1645     "redir",
1646     NULL_IF_CONFIG_SMALL("Redirector format"),
1647     0,
1648     redir_probe,
1649     redir_read_header,
1650     NULL,
1651     NULL,
1652 };
1653 #endif