libavformat/rtsp.c

   1 /*
   2  * RTSP/SDP client
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/base64.h"
  23 #include "libavutil/avstring.h"
  24 #include "libavutil/intreadwrite.h"
  25 #include "avformat.h"
  26
  27 #include <sys/time.h>
  28 #if HAVE_SYS_SELECT_H
  29 #include <sys/select.h>
  30 #endif
  31 #include <strings.h>
  32 #include "internal.h"
  33 #include "network.h"
  34 #include "os_support.h"
  35 #include "rtsp.h"
  36
  37 #include "rtpdec.h"
  38 #include "rdt.h"
  39 #include "rtpdec_asf.h"
  40
  41 //#define DEBUG
  42 //#define DEBUG_RTP_TCP
  43
  44 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  45 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
  46 #endif
  47
  48 /* Timeout values for socket select, in ms,
  49  * and read_packet(), in seconds  */
  50 #define SELECT_TIMEOUT_MS 100
  51 #define READ_PACKET_TIMEOUT_S 10
  52 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / SELECT_TIMEOUT_MS
  53
  54 #define SPACE_CHARS " \t\r\n"
  55 /* we use memchr() instead of strchr() here because strchr() will return
  56  * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
  57 #define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
  58 static void skip_spaces(const char **pp)
  59 {
  60     const char *p;
  61     p = *pp;
  62     while (redir_isspace(*p))
  63         p++;
  64     *pp = p;
  65 }
  66
  67 static void get_word_until_chars(char *buf, int buf_size,
  68                                  const char *sep, const char **pp)
  69 {
  70     const char *p;
  71     char *q;
  72
  73     p = *pp;
  74     skip_spaces(&p);
  75     q = buf;
  76     while (!strchr(sep, *p) && *p != '\0') {
  77         if ((q - buf) < buf_size - 1)
  78             *q++ = *p;
  79         p++;
  80     }
  81     if (buf_size > 0)
  82         *q = '\0';
  83     *pp = p;
  84 }
  85
  86 static void get_word_sep(char *buf, int buf_size, const char *sep,
  87                          const char **pp)
  88 {
  89     if (**pp == '/') (*pp)++;
  90     get_word_until_chars(buf, buf_size, sep, pp);
  91 }
  92
  93 static void get_word(char *buf, int buf_size, const char **pp)
  94 {
  95     get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
  96 }
  97
  98 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
  99 static int sdp_parse_rtpmap(AVFormatContext *s,
 100                             AVCodecContext *codec, RTSPStream *rtsp_st,
 101                             int payload_type, const char *p)
 102 {
 103     char buf[256];
 104     int i;
 105     AVCodec *c;
 106     const char *c_name;
 107
 108     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 109      * see if we can handle this kind of payload.
 110      * The space should normally not be there but some Real streams or
 111      * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
 112      * have a trailing space. */
 113     get_word_sep(buf, sizeof(buf), "/ ", &p);
 114     if (payload_type >= RTP_PT_PRIVATE) {
 115         RTPDynamicProtocolHandler *handler;
 116         for (handler = RTPFirstDynamicPayloadHandler;
 117              handler; handler = handler->next) {
 118             if (!strcasecmp(buf, handler->enc_name) &&
 119                 codec->codec_type == handler->codec_type) {
 120                 codec->codec_id          = handler->codec_id;
 121                 rtsp_st->dynamic_handler = handler;
 122                 if (handler->open)
 123                     rtsp_st->dynamic_protocol_context = handler->open();
 124                 break;
 125             }
 126         }
 127     } else {
 128         /* We are in a standard case
 129          * (from http://www.iana.org/assignments/rtp-parameters). */
 130         /* search into AVRtpPayloadTypes[] */
 131         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 132     }
 133
 134     c = avcodec_find_decoder(codec->codec_id);
 135     if (c && c->name)
 136         c_name = c->name;
 137     else
 138         c_name = "(null)";
 139
 140     get_word_sep(buf, sizeof(buf), "/", &p);
 141     i = atoi(buf);
 142     switch (codec->codec_type) {
 143     case AVMEDIA_TYPE_AUDIO:
 144         av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
 145         codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 146         codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 147         if (i > 0) {
 148             codec->sample_rate = i;
 149             get_word_sep(buf, sizeof(buf), "/", &p);
 150             i = atoi(buf);
 151             if (i > 0)
 152                 codec->channels = i;
 153             // TODO: there is a bug here; if it is a mono stream, and
 154             // less than 22000Hz, faad upconverts to stereo and twice
 155             // the frequency.  No problem, but the sample rate is being
 156             // set here by the sdp line. Patch on its way. (rdm)
 157         }
 158         av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
 159                codec->sample_rate);
 160         av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
 161                codec->channels);
 162         break;
 163     case AVMEDIA_TYPE_VIDEO:
 164         av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
 165         break;
 166     default:
 167         break;
 168     }
 169     return 0;
 170 }
 171
 172 /* return the length and optionally the data */
 173 static int hex_to_data(uint8_t *data, const char *p)
 174 {
 175     int c, len, v;
 176
 177     len = 0;
 178     v = 1;
 179     for (;;) {
 180         skip_spaces(&p);
 181         if (*p == '\0')
 182             break;
 183         c = toupper((unsigned char) *p++);
 184         if (c >= '0' && c <= '9')
 185             c = c - '0';
 186         else if (c >= 'A' && c <= 'F')
 187             c = c - 'A' + 10;
 188         else
 189             break;
 190         v = (v << 4) | c;
 191         if (v & 0x100) {
 192             if (data)
 193                 data[len] = v;
 194             len++;
 195             v = 1;
 196         }
 197     }
 198     return len;
 199 }
 200
 201 static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
 202                                   char *attr, char *value)
 203 {
 204     switch (codec->codec_id) {
 205     case CODEC_ID_MPEG4:
 206     case CODEC_ID_AAC:
 207         if (!strcmp(attr, "config")) {
 208             /* decode the hexa encoded parameter */
 209             int len = hex_to_data(NULL, value);
 210             if (codec->extradata)
 211                 av_free(codec->extradata);
 212             codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
 213             if (!codec->extradata)
 214                 return;
 215             codec->extradata_size = len;
 216             hex_to_data(codec->extradata, value);
 217         }
 218         break;
 219     default:
 220         break;
 221     }
 222     return;
 223 }
 224
 225 typedef struct {
 226     const char *str;
 227     uint16_t    type;
 228     uint32_t    offset;
 229 } AttrNameMap;
 230
 231 /* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
 232 #define ATTR_NAME_TYPE_INT 0
 233 #define ATTR_NAME_TYPE_STR 1
 234 static const AttrNameMap attr_names[]=
 235 {
 236     { "SizeLength",       ATTR_NAME_TYPE_INT,
 237       offsetof(RTPPayloadData, sizelength) },
 238     { "IndexLength",      ATTR_NAME_TYPE_INT,
 239       offsetof(RTPPayloadData, indexlength) },
 240     { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
 241       offsetof(RTPPayloadData, indexdeltalength) },
 242     { "profile-level-id", ATTR_NAME_TYPE_INT,
 243       offsetof(RTPPayloadData, profile_level_id) },
 244     { "StreamType",       ATTR_NAME_TYPE_INT,
 245       offsetof(RTPPayloadData, streamtype) },
 246     { "mode",             ATTR_NAME_TYPE_STR,
 247       offsetof(RTPPayloadData, mode) },
 248     { NULL, -1, -1 },
 249 };
 250
 251 /* parse the attribute line from the fmtp a line of an sdp response. This
 252  * is broken out as a function because it is used in rtp_h264.c, which is
 253  * forthcoming. */
 254 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
 255                                 char *value, int value_size)
 256 {
 257     skip_spaces(p);
 258     if (**p) {
 259         get_word_sep(attr, attr_size, "=", p);
 260         if (**p == '=')
 261             (*p)++;
 262         get_word_sep(value, value_size, ";", p);
 263         if (**p == ';')
 264             (*p)++;
 265         return 1;
 266     }
 267     return 0;
 268 }
 269
 270 /* parse a SDP line and save stream attributes */
 271 static void sdp_parse_fmtp(AVStream *st, const char *p)
 272 {
 273     char attr[256];
 274     /* Vorbis setup headers can be up to 12KB and are sent base64
 275      * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
 276     char value[16384];
 277     int i;
 278     RTSPStream *rtsp_st = st->priv_data;
 279     AVCodecContext *codec = st->codec;
 280     RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
 281
 282     /* loop on each attribute */
 283     while (ff_rtsp_next_attr_and_value(&p, attr, sizeof(attr),
 284                                        value, sizeof(value))) {
 285         /* grab the codec extra_data from the config parameter of the fmtp
 286          * line */
 287         sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
 288                               attr, value);
 289         /* Looking for a known attribute */
 290         for (i = 0; attr_names[i].str; ++i) {
 291             if (!strcasecmp(attr, attr_names[i].str)) {
 292                 if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
 293                     *(int *)((char *)rtp_payload_data +
 294                         attr_names[i].offset) = atoi(value);
 295                 } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
 296                     *(char **)((char *)rtp_payload_data +
 297                         attr_names[i].offset) = av_strdup(value);
 298             }
 299         }
 300     }
 301 }
 302
 303 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
 304  *  and end time.
 305  *  Used for seeking in the rtp stream.
 306  */
 307 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 308 {
 309     char buf[256];
 310
 311     skip_spaces(&p);
 312     if (!av_stristart(p, "npt=", &p))
 313         return;
 314
 315     *start = AV_NOPTS_VALUE;
 316     *end = AV_NOPTS_VALUE;
 317
 318     get_word_sep(buf, sizeof(buf), "-", &p);
 319     *start = parse_date(buf, 1);
 320     if (*p == '-') {
 321         p++;
 322         get_word_sep(buf, sizeof(buf), "-", &p);
 323         *end = parse_date(buf, 1);
 324     }
 325 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 326 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 327 }
 328
 329 typedef struct SDPParseState {
 330     /* SDP only */
 331     struct in_addr default_ip;
 332     int            default_ttl;
 333     int            skip_media;  ///< set if an unknown m= line occurs
 334 } SDPParseState;
 335
 336 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 337                            int letter, const char *buf)
 338 {
 339     RTSPState *rt = s->priv_data;
 340     char buf1[64], st_type[64];
 341     const char *p;
 342     enum AVMediaType codec_type;
 343     int payload_type, i;
 344     AVStream *st;
 345     RTSPStream *rtsp_st;
 346     struct in_addr sdp_ip;
 347     int ttl;
 348
 349     dprintf(s, "sdp: %c='%s'\n", letter, buf);
 350
 351     p = buf;
 352     if (s1->skip_media && letter != 'm')
 353         return;
 354     switch (letter) {
 355     case 'c':
 356         get_word(buf1, sizeof(buf1), &p);
 357         if (strcmp(buf1, "IN") != 0)
 358             return;
 359         get_word(buf1, sizeof(buf1), &p);
 360         if (strcmp(buf1, "IP4") != 0)
 361             return;
 362         get_word_sep(buf1, sizeof(buf1), "/", &p);
 363         if (ff_inet_aton(buf1, &sdp_ip) == 0)
 364             return;
 365         ttl = 16;
 366         if (*p == '/') {
 367             p++;
 368             get_word_sep(buf1, sizeof(buf1), "/", &p);
 369             ttl = atoi(buf1);
 370         }
 371         if (s->nb_streams == 0) {
 372             s1->default_ip = sdp_ip;
 373             s1->default_ttl = ttl;
 374         } else {
 375             st = s->streams[s->nb_streams - 1];
 376             rtsp_st = st->priv_data;
 377             rtsp_st->sdp_ip = sdp_ip;
 378             rtsp_st->sdp_ttl = ttl;
 379         }
 380         break;
 381     case 's':
 382         av_metadata_set(&s->metadata, "title", p);
 383         break;
 384     case 'i':
 385         if (s->nb_streams == 0) {
 386             av_metadata_set(&s->metadata, "comment", p);
 387             break;
 388         }
 389         break;
 390     case 'm':
 391         /* new stream */
 392         s1->skip_media = 0;
 393         get_word(st_type, sizeof(st_type), &p);
 394         if (!strcmp(st_type, "audio")) {
 395             codec_type = AVMEDIA_TYPE_AUDIO;
 396         } else if (!strcmp(st_type, "video")) {
 397             codec_type = AVMEDIA_TYPE_VIDEO;
 398         } else if (!strcmp(st_type, "application")) {
 399             codec_type = AVMEDIA_TYPE_DATA;
 400         } else {
 401             s1->skip_media = 1;
 402             return;
 403         }
 404         rtsp_st = av_mallocz(sizeof(RTSPStream));
 405         if (!rtsp_st)
 406             return;
 407         rtsp_st->stream_index = -1;
 408         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 409
 410         rtsp_st->sdp_ip = s1->default_ip;
 411         rtsp_st->sdp_ttl = s1->default_ttl;
 412
 413         get_word(buf1, sizeof(buf1), &p); /* port */
 414         rtsp_st->sdp_port = atoi(buf1);
 415
 416         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 417
 418         /* XXX: handle list of formats */
 419         get_word(buf1, sizeof(buf1), &p); /* format list */
 420         rtsp_st->sdp_payload_type = atoi(buf1);
 421
 422         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 423             /* no corresponding stream */
 424         } else {
 425             st = av_new_stream(s, 0);
 426             if (!st)
 427                 return;
 428             st->priv_data = rtsp_st;
 429             rtsp_st->stream_index = st->index;
 430             st->codec->codec_type = codec_type;
 431             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 432                 /* if standard payload type, we can find the codec right now */
 433                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 434             }
 435         }
 436         /* put a default control url */
 437         av_strlcpy(rtsp_st->control_url, rt->control_uri,
 438                    sizeof(rtsp_st->control_url));
 439         break;
 440     case 'a':
 441         if (av_strstart(p, "control:", &p)) {
 442             if (s->nb_streams == 0) {
 443                 if (!strncmp(p, "rtsp://", 7))
 444                     av_strlcpy(rt->control_uri, p,
 445                                sizeof(rt->control_uri));
 446             } else {
 447             char proto[32];
 448             /* get the control url */
 449             st = s->streams[s->nb_streams - 1];
 450             rtsp_st = st->priv_data;
 451
 452             /* XXX: may need to add full url resolution */
 453             ff_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
 454                          NULL, NULL, 0, p);
 455             if (proto[0] == '\0') {
 456                 /* relative control URL */
 457                 if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
 458                 av_strlcat(rtsp_st->control_url, "/",
 459                            sizeof(rtsp_st->control_url));
 460                 av_strlcat(rtsp_st->control_url, p,
 461                            sizeof(rtsp_st->control_url));
 462             } else
 463                 av_strlcpy(rtsp_st->control_url, p,
 464                            sizeof(rtsp_st->control_url));
 465             }
 466         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 467             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 468             get_word(buf1, sizeof(buf1), &p);
 469             payload_type = atoi(buf1);
 470             st = s->streams[s->nb_streams - 1];
 471             rtsp_st = st->priv_data;
 472             sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
 473         } else if (av_strstart(p, "fmtp:", &p)) {
 474             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 475             get_word(buf1, sizeof(buf1), &p);
 476             payload_type = atoi(buf1);
 477             for (i = 0; i < s->nb_streams; i++) {
 478                 st      = s->streams[i];
 479                 rtsp_st = st->priv_data;
 480                 if (rtsp_st->sdp_payload_type == payload_type) {
 481                     if (!(rtsp_st->dynamic_handler &&
 482                           rtsp_st->dynamic_handler->parse_sdp_a_line &&
 483                           rtsp_st->dynamic_handler->parse_sdp_a_line(s,
 484                               i, rtsp_st->dynamic_protocol_context, buf)))
 485                         sdp_parse_fmtp(st, p);
 486                 }
 487             }
 488         } else if (av_strstart(p, "framesize:", &p)) {
 489             // let dynamic protocol handlers have a stab at the line.
 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                     rtsp_st->dynamic_handler &&
 497                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 498                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
 499                         rtsp_st->dynamic_protocol_context, buf);
 500             }
 501         } else if (av_strstart(p, "range:", &p)) {
 502             int64_t start, end;
 503
 504             // this is so that seeking on a streamed file can work.
 505             rtsp_parse_range_npt(p, &start, &end);
 506             s->start_time = start;
 507             /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
 508             s->duration   = (end == AV_NOPTS_VALUE) ?
 509                             AV_NOPTS_VALUE : end - start;
 510         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 511             if (atoi(p) == 1)
 512                 rt->transport = RTSP_TRANSPORT_RDT;
 513         } else {
 514             if (rt->server_type == RTSP_SERVER_WMS)
 515                 ff_wms_parse_sdp_a_line(s, p);
 516             if (s->nb_streams > 0) {
 517                 if (rt->server_type == RTSP_SERVER_REAL)
 518                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 519
 520                 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 521                 if (rtsp_st->dynamic_handler &&
 522                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 523                     rtsp_st->dynamic_handler->parse_sdp_a_line(s,
 524                         s->nb_streams - 1,
 525                         rtsp_st->dynamic_protocol_context, buf);
 526             }
 527         }
 528         break;
 529     }
 530 }
 531
 532 static int sdp_parse(AVFormatContext *s, const char *content)
 533 {
 534     const char *p;
 535     int letter;
 536     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 537      * contain long SDP lines containing complete ASF Headers (several
 538      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 539      * "rulebooks" describing their properties. Therefore, the SDP line
 540      * buffer is large.
 541      *
 542      * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
 543     char buf[16384], *q;
 544     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 545
 546     memset(s1, 0, sizeof(SDPParseState));
 547     p = content;
 548     for (;;) {
 549         skip_spaces(&p);
 550         letter = *p;
 551         if (letter == '\0')
 552             break;
 553         p++;
 554         if (*p != '=')
 555             goto next_line;
 556         p++;
 557         /* get the content */
 558         q = buf;
 559         while (*p != '\n' && *p != '\r' && *p != '\0') {
 560             if ((q - buf) < sizeof(buf) - 1)
 561                 *q++ = *p;
 562             p++;
 563         }
 564         *q = '\0';
 565         sdp_parse_line(s, s1, letter, buf);
 566     next_line:
 567         while (*p != '\n' && *p != '\0')
 568             p++;
 569         if (*p == '\n')
 570             p++;
 571     }
 572     return 0;
 573 }
 574
 575 /* close and free RTSP streams */
 576 void ff_rtsp_close_streams(AVFormatContext *s)
 577 {
 578     RTSPState *rt = s->priv_data;
 579     int i;
 580     RTSPStream *rtsp_st;
 581
 582     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 583         rtsp_st = rt->rtsp_streams[i];
 584         if (rtsp_st) {
 585             if (rtsp_st->transport_priv) {
 586                 if (s->oformat) {
 587                     AVFormatContext *rtpctx = rtsp_st->transport_priv;
 588                     av_write_trailer(rtpctx);
 589                     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 590                         uint8_t *ptr;
 591                         url_close_dyn_buf(rtpctx->pb, &ptr);
 592                         av_free(ptr);
 593                     } else {
 594                         url_fclose(rtpctx->pb);
 595                     }
 596                     av_metadata_free(&rtpctx->streams[0]->metadata);
 597                     av_metadata_free(&rtpctx->metadata);
 598                     av_free(rtpctx->streams[0]);
 599                     av_free(rtpctx);
 600                 } else if (rt->transport == RTSP_TRANSPORT_RDT)
 601                     ff_rdt_parse_close(rtsp_st->transport_priv);
 602                 else
 603                     rtp_parse_close(rtsp_st->transport_priv);
 604             }
 605             if (rtsp_st->rtp_handle)
 606                 url_close(rtsp_st->rtp_handle);
 607             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 608                 rtsp_st->dynamic_handler->close(
 609                     rtsp_st->dynamic_protocol_context);
 610         }
 611     }
 612     av_free(rt->rtsp_streams);
 613     if (rt->asf_ctx) {
 614         av_close_input_stream (rt->asf_ctx);
 615         rt->asf_ctx = NULL;
 616     }
 617 }
 618
 619 static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st,
 620                                URLContext *handle)
 621 {
 622     RTSPState *rt = s->priv_data;
 623     AVFormatContext *rtpctx;
 624     int ret;
 625     AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
 626
 627     if (!rtp_format)
 628         return NULL;
 629
 630     /* Allocate an AVFormatContext for each output stream */
 631     rtpctx = avformat_alloc_context();
 632     if (!rtpctx)
 633         return NULL;
 634
 635     rtpctx->oformat = rtp_format;
 636     if (!av_new_stream(rtpctx, 0)) {
 637         av_free(rtpctx);
 638         return NULL;
 639     }
 640     /* Copy the max delay setting; the rtp muxer reads this. */
 641     rtpctx->max_delay = s->max_delay;
 642     /* Copy other stream parameters. */
 643     rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
 644
 645     /* Set the synchronized start time. */
 646     rtpctx->start_time_realtime = rt->start_time;
 647
 648     /* Remove the local codec, link to the original codec
 649      * context instead, to give the rtp muxer access to
 650      * codec parameters. */
 651     av_free(rtpctx->streams[0]->codec);
 652     rtpctx->streams[0]->codec = st->codec;
 653
 654     if (handle) {
 655         url_fdopen(&rtpctx->pb, handle);
 656     } else
 657         url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
 658     ret = av_write_header(rtpctx);
 659
 660     if (ret) {
 661         if (handle) {
 662             url_fclose(rtpctx->pb);
 663         } else {
 664             uint8_t *ptr;
 665             url_close_dyn_buf(rtpctx->pb, &ptr);
 666             av_free(ptr);
 667         }
 668         av_free(rtpctx->streams[0]);
 669         av_free(rtpctx);
 670         return NULL;
 671     }
 672
 673     /* Copy the RTP AVStream timebase back to the original AVStream */
 674     st->time_base = rtpctx->streams[0]->time_base;
 675     return rtpctx;
 676 }
 677
 678 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 679 {
 680     RTSPState *rt = s->priv_data;
 681     AVStream *st = NULL;
 682
 683     /* open the RTP context */
 684     if (rtsp_st->stream_index >= 0)
 685         st = s->streams[rtsp_st->stream_index];
 686     if (!st)
 687         s->ctx_flags |= AVFMTCTX_NOHEADER;
 688
 689     if (s->oformat) {
 690         rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
 691         /* Ownership of rtp_handle is passed to the rtp mux context */
 692         rtsp_st->rtp_handle = NULL;
 693     } else if (rt->transport == RTSP_TRANSPORT_RDT)
 694         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 695                                             rtsp_st->dynamic_protocol_context,
 696                                             rtsp_st->dynamic_handler);
 697     else
 698         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 699                                          rtsp_st->sdp_payload_type,
 700                                          &rtsp_st->rtp_payload_data);
 701
 702     if (!rtsp_st->transport_priv) {
 703          return AVERROR(ENOMEM);
 704     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 705         if (rtsp_st->dynamic_handler) {
 706             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 707                                            rtsp_st->dynamic_protocol_context,
 708                                            rtsp_st->dynamic_handler);
 709         }
 710     }
 711
 712     return 0;
 713 }
 714
 715 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
 716 static int rtsp_probe(AVProbeData *p)
 717 {
 718     if (av_strstart(p->filename, "rtsp:", NULL))
 719         return AVPROBE_SCORE_MAX;
 720     return 0;
 721 }
 722
 723 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 724 {
 725     const char *p;
 726     int v;
 727
 728     p = *pp;
 729     skip_spaces(&p);
 730     v = strtol(p, (char **)&p, 10);
 731     if (*p == '-') {
 732         p++;
 733         *min_ptr = v;
 734         v = strtol(p, (char **)&p, 10);
 735         *max_ptr = v;
 736     } else {
 737         *min_ptr = v;
 738         *max_ptr = v;
 739     }
 740     *pp = p;
 741 }
 742
 743 /* XXX: only one transport specification is parsed */
 744 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
 745 {
 746     char transport_protocol[16];
 747     char profile[16];
 748     char lower_transport[16];
 749     char parameter[16];
 750     RTSPTransportField *th;
 751     char buf[256];
 752
 753     reply->nb_transports = 0;
 754
 755     for (;;) {
 756         skip_spaces(&p);
 757         if (*p == '\0')
 758             break;
 759
 760         th = &reply->transports[reply->nb_transports];
 761
 762         get_word_sep(transport_protocol, sizeof(transport_protocol),
 763                      "/", &p);
 764         if (!strcasecmp (transport_protocol, "rtp")) {
 765             get_word_sep(profile, sizeof(profile), "/;,", &p);
 766             lower_transport[0] = '\0';
 767             /* rtp/avp/<protocol> */
 768             if (*p == '/') {
 769                 get_word_sep(lower_transport, sizeof(lower_transport),
 770                              ";,", &p);
 771             }
 772             th->transport = RTSP_TRANSPORT_RTP;
 773         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 774                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 775             /* x-pn-tng/<protocol> */
 776             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 777             profile[0] = '\0';
 778             th->transport = RTSP_TRANSPORT_RDT;
 779         }
 780         if (!strcasecmp(lower_transport, "TCP"))
 781             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 782         else
 783             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 784
 785         if (*p == ';')
 786             p++;
 787         /* get each parameter */
 788         while (*p != '\0' && *p != ',') {
 789             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 790             if (!strcmp(parameter, "port")) {
 791                 if (*p == '=') {
 792                     p++;
 793                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 794                 }
 795             } else if (!strcmp(parameter, "client_port")) {
 796                 if (*p == '=') {
 797                     p++;
 798                     rtsp_parse_range(&th->client_port_min,
 799                                      &th->client_port_max, &p);
 800                 }
 801             } else if (!strcmp(parameter, "server_port")) {
 802                 if (*p == '=') {
 803                     p++;
 804                     rtsp_parse_range(&th->server_port_min,
 805                                      &th->server_port_max, &p);
 806                 }
 807             } else if (!strcmp(parameter, "interleaved")) {
 808                 if (*p == '=') {
 809                     p++;
 810                     rtsp_parse_range(&th->interleaved_min,
 811                                      &th->interleaved_max, &p);
 812                 }
 813             } else if (!strcmp(parameter, "multicast")) {
 814                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 815                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 816             } else if (!strcmp(parameter, "ttl")) {
 817                 if (*p == '=') {
 818                     p++;
 819                     th->ttl = strtol(p, (char **)&p, 10);
 820                 }
 821             } else if (!strcmp(parameter, "destination")) {
 822                 struct in_addr ipaddr;
 823
 824                 if (*p == '=') {
 825                     p++;
 826                     get_word_sep(buf, sizeof(buf), ";,", &p);
 827                     if (ff_inet_aton(buf, &ipaddr))
 828                         th->destination = ntohl(ipaddr.s_addr);
 829                 }
 830             }
 831             while (*p != ';' && *p != '\0' && *p != ',')
 832                 p++;
 833             if (*p == ';')
 834                 p++;
 835         }
 836         if (*p == ',')
 837             p++;
 838
 839         reply->nb_transports++;
 840     }
 841 }
 842
 843 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
 844                         HTTPAuthState *auth_state)
 845 {
 846     const char *p;
 847
 848     /* NOTE: we do case independent match for broken servers */
 849     p = buf;
 850     if (av_stristart(p, "Session:", &p)) {
 851         int t;
 852         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 853         if (av_stristart(p, ";timeout=", &p) &&
 854             (t = strtol(p, NULL, 10)) > 0) {
 855             reply->timeout = t;
 856         }
 857     } else if (av_stristart(p, "Content-Length:", &p)) {
 858         reply->content_length = strtol(p, NULL, 10);
 859     } else if (av_stristart(p, "Transport:", &p)) {
 860         rtsp_parse_transport(reply, p);
 861     } else if (av_stristart(p, "CSeq:", &p)) {
 862         reply->seq = strtol(p, NULL, 10);
 863     } else if (av_stristart(p, "Range:", &p)) {
 864         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 865     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 866         skip_spaces(&p);
 867         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 868     } else if (av_stristart(p, "Server:", &p)) {
 869         skip_spaces(&p);
 870         av_strlcpy(reply->server, p, sizeof(reply->server));
 871     } else if (av_stristart(p, "Notice:", &p) ||
 872                av_stristart(p, "X-Notice:", &p)) {
 873         reply->notice = strtol(p, NULL, 10);
 874     } else if (av_stristart(p, "Location:", &p)) {
 875         skip_spaces(&p);
 876         av_strlcpy(reply->location, p , sizeof(reply->location));
 877     } else if (av_stristart(p, "WWW-Authenticate:", &p) && auth_state) {
 878         skip_spaces(&p);
 879         ff_http_auth_handle_header(auth_state, "WWW-Authenticate", p);
 880     } else if (av_stristart(p, "Authentication-Info:", &p) && auth_state) {
 881         skip_spaces(&p);
 882         ff_http_auth_handle_header(auth_state, "Authentication-Info", p);
 883     }
 884 }
 885
 886 /* skip a RTP/TCP interleaved packet */
 887 void ff_rtsp_skip_packet(AVFormatContext *s)
 888 {
 889     RTSPState *rt = s->priv_data;
 890     int ret, len, len1;
 891     uint8_t buf[1024];
 892
 893     ret = url_read_complete(rt->rtsp_hd, buf, 3);
 894     if (ret != 3)
 895         return;
 896     len = AV_RB16(buf + 1);
 897
 898     dprintf(s, "skipping RTP packet len=%d\n", len);
 899
 900     /* skip payload */
 901     while (len > 0) {
 902         len1 = len;
 903         if (len1 > sizeof(buf))
 904             len1 = sizeof(buf);
 905         ret = url_read_complete(rt->rtsp_hd, buf, len1);
 906         if (ret != len1)
 907             return;
 908         len -= len1;
 909     }
 910 }
 911
 912 int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
 913                        unsigned char **content_ptr,
 914                        int return_on_interleaved_data)
 915 {
 916     RTSPState *rt = s->priv_data;
 917     char buf[4096], buf1[1024], *q;
 918     unsigned char ch;
 919     const char *p;
 920     int ret, content_length, line_count = 0;
 921     unsigned char *content = NULL;
 922
 923     memset(reply, 0, sizeof(*reply));
 924
 925     /* parse reply (XXX: use buffers) */
 926     rt->last_reply[0] = '\0';
 927     for (;;) {
 928         q = buf;
 929         for (;;) {
 930             ret = url_read_complete(rt->rtsp_hd, &ch, 1);
 931 #ifdef DEBUG_RTP_TCP
 932             dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
 933 #endif
 934             if (ret != 1)
 935                 return -1;
 936             if (ch == '\n')
 937                 break;
 938             if (ch == '$') {
 939                 /* XXX: only parse it if first char on line ? */
 940                 if (return_on_interleaved_data) {
 941                     return 1;
 942                 } else
 943                     ff_rtsp_skip_packet(s);
 944             } else if (ch != '\r') {
 945                 if ((q - buf) < sizeof(buf) - 1)
 946                     *q++ = ch;
 947             }
 948         }
 949         *q = '\0';
 950
 951         dprintf(s, "line='%s'\n", buf);
 952
 953         /* test if last line */
 954         if (buf[0] == '\0')
 955             break;
 956         p = buf;
 957         if (line_count == 0) {
 958             /* get reply code */
 959             get_word(buf1, sizeof(buf1), &p);
 960             get_word(buf1, sizeof(buf1), &p);
 961             reply->status_code = atoi(buf1);
 962         } else {
 963             ff_rtsp_parse_line(reply, p, &rt->auth_state);
 964             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 965             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 966         }
 967         line_count++;
 968     }
 969
 970     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 971         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 972
 973     content_length = reply->content_length;
 974     if (content_length > 0) {
 975         /* leave some room for a trailing '\0' (useful for simple parsing) */
 976         content = av_malloc(content_length + 1);
 977         (void)url_read_complete(rt->rtsp_hd, content, content_length);
 978         content[content_length] = '\0';
 979     }
 980     if (content_ptr)
 981         *content_ptr = content;
 982     else
 983         av_free(content);
 984
 985     if (rt->seq != reply->seq) {
 986         av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
 987             rt->seq, reply->seq);
 988     }
 989
 990     /* EOS */
 991     if (reply->notice == 2101 /* End-of-Stream Reached */      ||
 992         reply->notice == 2104 /* Start-of-Stream Reached */    ||
 993         reply->notice == 2306 /* Continuous Feed Terminated */) {
 994         rt->state = RTSP_STATE_IDLE;
 995     } else if (reply->notice >= 4400 && reply->notice < 5500) {
 996         return AVERROR(EIO); /* data or server error */
 997     } else if (reply->notice == 2401 /* Ticket Expired */ ||
 998              (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
 999         return AVERROR(EPERM);
1000
1001     return 0;
1002 }
1003
1004 void ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
1005                                          const char *method, const char *url,
1006                                          const char *headers,
1007                                          const unsigned char *send_content,
1008                                          int send_content_length)
1009 {
1010     RTSPState *rt = s->priv_data;
1011     char buf[4096];
1012
1013     rt->seq++;
1014     snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1015     if (headers)
1016         av_strlcat(buf, headers, sizeof(buf));
1017     av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1018     if (rt->session_id[0] != '\0' && (!headers ||
1019         !strstr(headers, "\nIf-Match:"))) {
1020         av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1021     }
1022     if (rt->auth[0]) {
1023         char *str = ff_http_auth_create_response(&rt->auth_state,
1024                                                  rt->auth, url, method);
1025         if (str)
1026             av_strlcat(buf, str, sizeof(buf));
1027         av_free(str);
1028     }
1029     if (send_content_length > 0 && send_content)
1030         av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1031     av_strlcat(buf, "\r\n", sizeof(buf));
1032
1033     dprintf(s, "Sending:\n%s--\n", buf);
1034
1035     url_write(rt->rtsp_hd, buf, strlen(buf));
1036     if (send_content_length > 0 && send_content)
1037         url_write(rt->rtsp_hd, send_content, send_content_length);
1038     rt->last_cmd_time = av_gettime();
1039 }
1040
1041 void ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1042                             const char *url, const char *headers)
1043 {
1044     ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1045 }
1046
1047 void ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1048                       const char *headers, RTSPMessageHeader *reply,
1049                       unsigned char **content_ptr)
1050 {
1051     ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1052                                   content_ptr, NULL, 0);
1053 }
1054
1055 void ff_rtsp_send_cmd_with_content(AVFormatContext *s,
1056                                    const char *method, const char *url,
1057                                    const char *header,
1058                                    RTSPMessageHeader *reply,
1059                                    unsigned char **content_ptr,
1060                                    const unsigned char *send_content,
1061                                    int send_content_length)
1062 {
1063     RTSPState *rt = s->priv_data;
1064     HTTPAuthType cur_auth_type;
1065
1066 retry:
1067     cur_auth_type = rt->auth_state.auth_type;
1068     ff_rtsp_send_cmd_with_content_async(s, method, url, header,
1069                                         send_content, send_content_length);
1070
1071     ff_rtsp_read_reply(s, reply, content_ptr, 0);
1072
1073     if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
1074         rt->auth_state.auth_type != HTTP_AUTH_NONE)
1075         goto retry;
1076 }
1077
1078 /**
1079  * @return 0 on success, <0 on error, 1 if protocol is unavailable.
1080  */
1081 static int make_setup_request(AVFormatContext *s, const char *host, int port,
1082                               int lower_transport, const char *real_challenge)
1083 {
1084     RTSPState *rt = s->priv_data;
1085     int rtx, j, i, err, interleave = 0;
1086     RTSPStream *rtsp_st;
1087     RTSPMessageHeader reply1, *reply = &reply1;
1088     char cmd[2048];
1089     const char *trans_pref;
1090
1091     if (rt->transport == RTSP_TRANSPORT_RDT)
1092         trans_pref = "x-pn-tng";
1093     else
1094         trans_pref = "RTP/AVP";
1095
1096     /* default timeout: 1 minute */
1097     rt->timeout = 60;
1098
1099     /* for each stream, make the setup request */
1100     /* XXX: we assume the same server is used for the control of each
1101      * RTSP stream */
1102
1103     for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1104         char transport[2048];
1105
1106         /**
1107          * WMS serves all UDP data over a single connection, the RTX, which
1108          * isn't necessarily the first in the SDP but has to be the first
1109          * to be set up, else the second/third SETUP will fail with a 461.
1110          */
1111         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1112              rt->server_type == RTSP_SERVER_WMS) {
1113             if (i == 0) {
1114                 /* rtx first */
1115                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1116                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
1117                     if (len >= 4 &&
1118                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1119                                 "/rtx"))
1120                         break;
1121                 }
1122                 if (rtx == rt->nb_rtsp_streams)
1123                     return -1; /* no RTX found */
1124                 rtsp_st = rt->rtsp_streams[rtx];
1125             } else
1126                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1127         } else
1128             rtsp_st = rt->rtsp_streams[i];
1129
1130         /* RTP/UDP */
1131         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1132             char buf[256];
1133
1134             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1135                 port = reply->transports[0].client_port_min;
1136                 goto have_port;
1137             }
1138
1139             /* first try in specified port range */
1140             if (RTSP_RTP_PORT_MIN != 0) {
1141                 while (j <= RTSP_RTP_PORT_MAX) {
1142                     ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1143                                 "?localport=%d", j);
1144                     /* we will use two ports per rtp stream (rtp and rtcp) */
1145                     j += 2;
1146                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1147                         goto rtp_opened;
1148                 }
1149             }
1150
1151 #if 0
1152             /* then try on any port */
1153             if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1154                 err = AVERROR_INVALIDDATA;
1155                 goto fail;
1156             }
1157 #endif
1158
1159         rtp_opened:
1160             port = rtp_get_local_port(rtsp_st->rtp_handle);
1161         have_port:
1162             snprintf(transport, sizeof(transport) - 1,
1163                      "%s/UDP;", trans_pref);
1164             if (rt->server_type != RTSP_SERVER_REAL)
1165                 av_strlcat(transport, "unicast;", sizeof(transport));
1166             av_strlcatf(transport, sizeof(transport),
1167                      "client_port=%d", port);
1168             if (rt->transport == RTSP_TRANSPORT_RTP &&
1169                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1170                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1171         }
1172
1173         /* RTP/TCP */
1174         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1175             /** For WMS streams, the application streams are only used for
1176              * UDP. When trying to set it up for TCP streams, the server
1177              * will return an error. Therefore, we skip those streams. */
1178             if (rt->server_type == RTSP_SERVER_WMS &&
1179                 s->streams[rtsp_st->stream_index]->codec->codec_type ==
1180                     AVMEDIA_TYPE_DATA)
1181                 continue;
1182             snprintf(transport, sizeof(transport) - 1,
1183                      "%s/TCP;", trans_pref);
1184             if (rt->server_type == RTSP_SERVER_WMS)
1185                 av_strlcat(transport, "unicast;", sizeof(transport));
1186             av_strlcatf(transport, sizeof(transport),
1187                         "interleaved=%d-%d",
1188                         interleave, interleave + 1);
1189             interleave += 2;
1190         }
1191
1192         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1193             snprintf(transport, sizeof(transport) - 1,
1194                      "%s/UDP;multicast", trans_pref);
1195         }
1196         if (s->oformat) {
1197             av_strlcat(transport, ";mode=receive", sizeof(transport));
1198         } else if (rt->server_type == RTSP_SERVER_REAL ||
1199                    rt->server_type == RTSP_SERVER_WMS)
1200             av_strlcat(transport, ";mode=play", sizeof(transport));
1201         snprintf(cmd, sizeof(cmd),
1202                  "Transport: %s\r\n",
1203                  transport);
1204         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1205             char real_res[41], real_csum[9];
1206             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1207                                               real_challenge);
1208             av_strlcatf(cmd, sizeof(cmd),
1209                         "If-Match: %s\r\n"
1210                         "RealChallenge2: %s, sd=%s\r\n",
1211                         rt->session_id, real_res, real_csum);
1212         }
1213         ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1214         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1215             err = 1;
1216             goto fail;
1217         } else if (reply->status_code != RTSP_STATUS_OK ||
1218                    reply->nb_transports != 1) {
1219             err = AVERROR_INVALIDDATA;
1220             goto fail;
1221         }
1222
1223         /* XXX: same protocol for all streams is required */
1224         if (i > 0) {
1225             if (reply->transports[0].lower_transport != rt->lower_transport ||
1226                 reply->transports[0].transport != rt->transport) {
1227                 err = AVERROR_INVALIDDATA;
1228                 goto fail;
1229             }
1230         } else {
1231             rt->lower_transport = reply->transports[0].lower_transport;
1232             rt->transport = reply->transports[0].transport;
1233         }
1234
1235         /* close RTP connection if not choosen */
1236         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1237             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1238             url_close(rtsp_st->rtp_handle);
1239             rtsp_st->rtp_handle = NULL;
1240         }
1241
1242         switch(reply->transports[0].lower_transport) {
1243         case RTSP_LOWER_TRANSPORT_TCP:
1244             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1245             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1246             break;
1247
1248         case RTSP_LOWER_TRANSPORT_UDP: {
1249             char url[1024];
1250
1251             /* XXX: also use address if specified */
1252             ff_url_join(url, sizeof(url), "rtp", NULL, host,
1253                         reply->transports[0].server_port_min, NULL);
1254             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1255                 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1256                 err = AVERROR_INVALIDDATA;
1257                 goto fail;
1258             }
1259             /* Try to initialize the connection state in a
1260              * potential NAT router by sending dummy packets.
1261              * RTP/RTCP dummy packets are used for RDT, too.
1262              */
1263             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1264                 rtp_send_punch_packets(rtsp_st->rtp_handle);
1265             break;
1266         }
1267         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1268             char url[1024];
1269             struct in_addr in;
1270             int port, ttl;
1271
1272             if (reply->transports[0].destination) {
1273                 in.s_addr = htonl(reply->transports[0].destination);
1274                 port      = reply->transports[0].port_min;
1275                 ttl       = reply->transports[0].ttl;
1276             } else {
1277                 in        = rtsp_st->sdp_ip;
1278                 port      = rtsp_st->sdp_port;
1279                 ttl       = rtsp_st->sdp_ttl;
1280             }
1281             ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1282                         port, "?ttl=%d", ttl);
1283             if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1284                 err = AVERROR_INVALIDDATA;
1285                 goto fail;
1286             }
1287             break;
1288         }
1289         }
1290
1291         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1292             goto fail;
1293     }
1294
1295     if (reply->timeout > 0)
1296         rt->timeout = reply->timeout;
1297
1298     if (rt->server_type == RTSP_SERVER_REAL)
1299         rt->need_subscription = 1;
1300
1301     return 0;
1302
1303 fail:
1304     for (i = 0; i < rt->nb_rtsp_streams; i++) {
1305         if (rt->rtsp_streams[i]->rtp_handle) {
1306             url_close(rt->rtsp_streams[i]->rtp_handle);
1307             rt->rtsp_streams[i]->rtp_handle = NULL;
1308         }
1309     }
1310     return err;
1311 }
1312
1313 static int rtsp_read_play(AVFormatContext *s)
1314 {
1315     RTSPState *rt = s->priv_data;
1316     RTSPMessageHeader reply1, *reply = &reply1;
1317     char cmd[1024];
1318
1319     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1320
1321     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1322         if (rt->state == RTSP_STATE_PAUSED) {
1323             cmd[0] = 0;
1324         } else {
1325             snprintf(cmd, sizeof(cmd),
1326                      "Range: npt=%0.3f-\r\n",
1327                      (double)rt->seek_timestamp / AV_TIME_BASE);
1328         }
1329         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
1330         if (reply->status_code != RTSP_STATUS_OK) {
1331             return -1;
1332         }
1333     }
1334     rt->state = RTSP_STATE_STREAMING;
1335     return 0;
1336 }
1337
1338 static int rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
1339 {
1340     RTSPState *rt = s->priv_data;
1341     char cmd[1024];
1342     unsigned char *content = NULL;
1343     int ret;
1344
1345     /* describe the stream */
1346     snprintf(cmd, sizeof(cmd),
1347              "Accept: application/sdp\r\n");
1348     if (rt->server_type == RTSP_SERVER_REAL) {
1349         /**
1350          * The Require: attribute is needed for proper streaming from
1351          * Realmedia servers.
1352          */
1353         av_strlcat(cmd,
1354                    "Require: com.real.retain-entity-for-setup\r\n",
1355                    sizeof(cmd));
1356     }
1357     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
1358     if (!content)
1359         return AVERROR_INVALIDDATA;
1360     if (reply->status_code != RTSP_STATUS_OK) {
1361         av_freep(&content);
1362         return AVERROR_INVALIDDATA;
1363     }
1364
1365     /* now we got the SDP description, we parse it */
1366     ret = sdp_parse(s, (const char *)content);
1367     av_freep(&content);
1368     if (ret < 0)
1369         return AVERROR_INVALIDDATA;
1370
1371     return 0;
1372 }
1373
1374 static int rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
1375 {
1376     RTSPState *rt = s->priv_data;
1377     RTSPMessageHeader reply1, *reply = &reply1;
1378     int i;
1379     char *sdp;
1380     AVFormatContext sdp_ctx, *ctx_array[1];
1381
1382     rt->start_time = av_gettime();
1383
1384     /* Announce the stream */
1385     sdp = av_mallocz(8192);
1386     if (sdp == NULL)
1387         return AVERROR(ENOMEM);
1388     /* We create the SDP based on the RTSP AVFormatContext where we
1389      * aren't allowed to change the filename field. (We create the SDP
1390      * based on the RTSP context since the contexts for the RTP streams
1391      * don't exist yet.) In order to specify a custom URL with the actual
1392      * peer IP instead of the originally specified hostname, we create
1393      * a temporary copy of the AVFormatContext, where the custom URL is set.
1394      *
1395      * FIXME: Create the SDP without copying the AVFormatContext.
1396      * This either requires setting up the RTP stream AVFormatContexts
1397      * already here (complicating things immensely) or getting a more
1398      * flexible SDP creation interface.
1399      */
1400     sdp_ctx = *s;
1401     ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
1402                 "rtsp", NULL, addr, -1, NULL);
1403     ctx_array[0] = &sdp_ctx;
1404     if (avf_sdp_create(ctx_array, 1, sdp, 8192)) {
1405         av_free(sdp);
1406         return AVERROR_INVALIDDATA;
1407     }
1408     av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1409     ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
1410                                   "Content-Type: application/sdp\r\n",
1411                                   reply, NULL, sdp, strlen(sdp));
1412     av_free(sdp);
1413     if (reply->status_code != RTSP_STATUS_OK)
1414         return AVERROR_INVALIDDATA;
1415
1416     /* Set up the RTSPStreams for each AVStream */
1417     for (i = 0; i < s->nb_streams; i++) {
1418         RTSPStream *rtsp_st;
1419         AVStream *st = s->streams[i];
1420
1421         rtsp_st = av_mallocz(sizeof(RTSPStream));
1422         if (!rtsp_st)
1423             return AVERROR(ENOMEM);
1424         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1425
1426         st->priv_data = rtsp_st;
1427         rtsp_st->stream_index = i;
1428
1429         av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
1430         /* Note, this must match the relative uri set in the sdp content */
1431         av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1432                     "/streamid=%d", i);
1433     }
1434
1435     return 0;
1436 }
1437
1438 int ff_rtsp_connect(AVFormatContext *s)
1439 {
1440     RTSPState *rt = s->priv_data;
1441     char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1442     char *option_list, *option, *filename;
1443     URLContext *rtsp_hd;
1444     int port, err, tcp_fd;
1445     RTSPMessageHeader reply1 = {}, *reply = &reply1;
1446     int lower_transport_mask = 0;
1447     char real_challenge[64];
1448     struct sockaddr_storage peer;
1449     socklen_t peer_len = sizeof(peer);
1450
1451     if (!ff_network_init())
1452         return AVERROR(EIO);
1453 redirect:
1454     /* extract hostname and port */
1455     ff_url_split(NULL, 0, auth, sizeof(auth),
1456                  host, sizeof(host), &port, path, sizeof(path), s->filename);
1457     if (*auth) {
1458         av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1459     }
1460     if (port < 0)
1461         port = RTSP_DEFAULT_PORT;
1462
1463     /* search for options */
1464     option_list = strrchr(path, '?');
1465     if (option_list) {
1466         /* Strip out the RTSP specific options, write out the rest of
1467          * the options back into the same string. */
1468         filename = option_list;
1469         while (option_list) {
1470             /* move the option pointer */
1471             option = ++option_list;
1472             option_list = strchr(option_list, '&');
1473             if (option_list)
1474                 *option_list = 0;
1475
1476             /* handle the options */
1477             if (!strcmp(option, "udp")) {
1478                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1479             } else if (!strcmp(option, "multicast")) {
1480                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1481             } else if (!strcmp(option, "tcp")) {
1482                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1483             } else {
1484                 /* Write options back into the buffer, using memmove instead
1485                  * of strcpy since the strings may overlap. */
1486                 int len = strlen(option);
1487                 memmove(++filename, option, len);
1488                 filename += len;
1489                 if (option_list) *filename = '&';
1490             }
1491         }
1492         *filename = 0;
1493     }
1494
1495     if (!lower_transport_mask)
1496         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1497
1498     if (s->oformat) {
1499         /* Only UDP or TCP - UDP multicast isn't supported. */
1500         lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1501                                 (1 << RTSP_LOWER_TRANSPORT_TCP);
1502         if (!lower_transport_mask) {
1503             av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1504                                     "only UDP and TCP are supported for output.\n");
1505             err = AVERROR(EINVAL);
1506             goto fail;
1507         }
1508     }
1509
1510     /* Construct the URI used in request; this is similar to s->filename,
1511      * but with authentication credentials removed and RTSP specific options
1512      * stripped out. */
1513     ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1514                 host, port, "%s", path);
1515
1516     /* open the tcp connexion */
1517     ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1518     if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1519         err = AVERROR(EIO);
1520         goto fail;
1521     }
1522     rt->rtsp_hd = rtsp_hd;
1523     rt->seq = 0;
1524
1525     tcp_fd = url_get_file_handle(rtsp_hd);
1526     if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1527         getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1528                     NULL, 0, NI_NUMERICHOST);
1529     }
1530
1531     /* request options supported by the server; this also detects server
1532      * type */
1533     for (rt->server_type = RTSP_SERVER_RTP;;) {
1534         cmd[0] = 0;
1535         if (rt->server_type == RTSP_SERVER_REAL)
1536             av_strlcat(cmd,
1537                        /**
1538                         * The following entries are required for proper
1539                         * streaming from a Realmedia server. They are
1540                         * interdependent in some way although we currently
1541                         * don't quite understand how. Values were copied
1542                         * from mplayer SVN r23589.
1543                         * @param CompanyID is a 16-byte ID in base64
1544                         * @param ClientChallenge is a 16-byte ID in hex
1545                         */
1546                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1547                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1548                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1549                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1550                        sizeof(cmd));
1551         ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1552         if (reply->status_code != RTSP_STATUS_OK) {
1553             err = AVERROR_INVALIDDATA;
1554             goto fail;
1555         }
1556
1557         /* detect server type if not standard-compliant RTP */
1558         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1559             rt->server_type = RTSP_SERVER_REAL;
1560             continue;
1561         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1562             rt->server_type = RTSP_SERVER_WMS;
1563         } else if (rt->server_type == RTSP_SERVER_REAL)
1564             strcpy(real_challenge, reply->real_challenge);
1565         break;
1566     }
1567
1568     if (s->iformat)
1569         err = rtsp_setup_input_streams(s, reply);
1570     else
1571         err = rtsp_setup_output_streams(s, host);
1572     if (err)
1573         goto fail;
1574
1575     do {
1576         int lower_transport = ff_log2_tab[lower_transport_mask &
1577                                   ~(lower_transport_mask - 1)];
1578
1579         err = make_setup_request(s, host, port, lower_transport,
1580                                  rt->server_type == RTSP_SERVER_REAL ?
1581                                      real_challenge : NULL);
1582         if (err < 0)
1583             goto fail;
1584         lower_transport_mask &= ~(1 << lower_transport);
1585         if (lower_transport_mask == 0 && err == 1) {
1586             err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1587             goto fail;
1588         }
1589     } while (err);
1590
1591     rt->state = RTSP_STATE_IDLE;
1592     rt->seek_timestamp = 0; /* default is to start stream at position zero */
1593     return 0;
1594  fail:
1595     ff_rtsp_close_streams(s);
1596     url_close(rt->rtsp_hd);
1597     if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1598         av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1599         av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1600                reply->status_code,
1601                s->filename);
1602         goto redirect;
1603     }
1604     ff_network_close();
1605     return err;
1606 }
1607 #endif
1608
1609 #if CONFIG_RTSP_DEMUXER
1610 static int rtsp_read_header(AVFormatContext *s,
1611                             AVFormatParameters *ap)
1612 {
1613     RTSPState *rt = s->priv_data;
1614     int ret;
1615
1616     ret = ff_rtsp_connect(s);
1617     if (ret)
1618         return ret;
1619
1620     if (ap->initial_pause) {
1621          /* do not start immediately */
1622     } else {
1623          if (rtsp_read_play(s) < 0) {
1624             ff_rtsp_close_streams(s);
1625             url_close(rt->rtsp_hd);
1626             return AVERROR_INVALIDDATA;
1627         }
1628     }
1629
1630     return 0;
1631 }
1632
1633 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1634                            uint8_t *buf, int buf_size)
1635 {
1636     RTSPState *rt = s->priv_data;
1637     RTSPStream *rtsp_st;
1638     fd_set rfds;
1639     int fd, fd_max, n, i, ret, tcp_fd, timeout_cnt = 0;
1640     struct timeval tv;
1641
1642     for (;;) {
1643         if (url_interrupt_cb())
1644             return AVERROR(EINTR);
1645         FD_ZERO(&rfds);
1646         if (rt->rtsp_hd) {
1647             tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1648             FD_SET(tcp_fd, &rfds);
1649         } else {
1650             fd_max = 0;
1651             tcp_fd = -1;
1652         }
1653         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1654             rtsp_st = rt->rtsp_streams[i];
1655             if (rtsp_st->rtp_handle) {
1656                 /* currently, we cannot probe RTCP handle because of
1657                  * blocking restrictions */
1658                 fd = url_get_file_handle(rtsp_st->rtp_handle);
1659                 if (fd > fd_max)
1660                     fd_max = fd;
1661                 FD_SET(fd, &rfds);
1662             }
1663         }
1664         tv.tv_sec = 0;
1665         tv.tv_usec = SELECT_TIMEOUT_MS * 1000;
1666         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1667         if (n > 0) {
1668             timeout_cnt = 0;
1669             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1670                 rtsp_st = rt->rtsp_streams[i];
1671                 if (rtsp_st->rtp_handle) {
1672                     fd = url_get_file_handle(rtsp_st->rtp_handle);
1673                     if (FD_ISSET(fd, &rfds)) {
1674                         ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1675                         if (ret > 0) {
1676                             *prtsp_st = rtsp_st;
1677                             return ret;
1678                         }
1679                     }
1680                 }
1681             }
1682 #if CONFIG_RTSP_DEMUXER
1683             if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1684                 RTSPMessageHeader reply;
1685
1686                 ret = ff_rtsp_read_reply(s, &reply, NULL, 0);
1687                 if (ret < 0)
1688                     return ret;
1689                 /* XXX: parse message */
1690                 if (rt->state != RTSP_STATE_STREAMING)
1691                     return 0;
1692             }
1693 #endif
1694         } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1695             return AVERROR(ETIMEDOUT);
1696         } else if (n < 0 && errno != EINTR)
1697             return AVERROR(errno);
1698     }
1699 }
1700
1701 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1702                            uint8_t *buf, int buf_size)
1703 {
1704     RTSPState *rt = s->priv_data;
1705     int id, len, i, ret;
1706     RTSPStream *rtsp_st;
1707
1708 #ifdef DEBUG_RTP_TCP
1709     dprintf(s, "tcp_read_packet:\n");
1710 #endif
1711 redo:
1712     for (;;) {
1713         RTSPMessageHeader reply;
1714
1715         ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1716         if (ret == -1)
1717             return -1;
1718         if (ret == 1) /* received '$' */
1719             break;
1720         /* XXX: parse message */
1721         if (rt->state != RTSP_STATE_STREAMING)
1722             return 0;
1723     }
1724     ret = url_read_complete(rt->rtsp_hd, buf, 3);
1725     if (ret != 3)
1726         return -1;
1727     id  = buf[0];
1728     len = AV_RB16(buf + 1);
1729 #ifdef DEBUG_RTP_TCP
1730     dprintf(s, "id=%d len=%d\n", id, len);
1731 #endif
1732     if (len > buf_size || len < 12)
1733         goto redo;
1734     /* get the data */
1735     ret = url_read_complete(rt->rtsp_hd, buf, len);
1736     if (ret != len)
1737         return -1;
1738     if (rt->transport == RTSP_TRANSPORT_RDT &&
1739         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1740         return -1;
1741
1742     /* find the matching stream */
1743     for (i = 0; i < rt->nb_rtsp_streams; i++) {
1744         rtsp_st = rt->rtsp_streams[i];
1745         if (id >= rtsp_st->interleaved_min &&
1746             id <= rtsp_st->interleaved_max)
1747             goto found;
1748     }
1749     goto redo;
1750 found:
1751     *prtsp_st = rtsp_st;
1752     return len;
1753 }
1754
1755 static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1756 {
1757     RTSPState *rt = s->priv_data;
1758     int ret, len;
1759     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1760     RTSPStream *rtsp_st;
1761
1762     /* get next frames from the same RTP packet */
1763     if (rt->cur_transport_priv) {
1764         if (rt->transport == RTSP_TRANSPORT_RDT) {
1765             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1766         } else
1767             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1768         if (ret == 0) {
1769             rt->cur_transport_priv = NULL;
1770             return 0;
1771         } else if (ret == 1) {
1772             return 0;
1773         } else
1774             rt->cur_transport_priv = NULL;
1775     }
1776
1777     /* read next RTP packet */
1778  redo:
1779     switch(rt->lower_transport) {
1780     default:
1781 #if CONFIG_RTSP_DEMUXER
1782     case RTSP_LOWER_TRANSPORT_TCP:
1783         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1784         break;
1785 #endif
1786     case RTSP_LOWER_TRANSPORT_UDP:
1787     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1788         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1789         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1790             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1791         break;
1792     }
1793     if (len < 0)
1794         return len;
1795     if (len == 0)
1796         return AVERROR_EOF;
1797     if (rt->transport == RTSP_TRANSPORT_RDT) {
1798         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1799     } else
1800         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1801     if (ret < 0)
1802         goto redo;
1803     if (ret == 1)
1804         /* more packets may follow, so we save the RTP context */
1805         rt->cur_transport_priv = rtsp_st->transport_priv;
1806
1807     return ret;
1808 }
1809
1810 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1811 {
1812     RTSPState *rt = s->priv_data;
1813     int ret;
1814     RTSPMessageHeader reply1, *reply = &reply1;
1815     char cmd[1024];
1816
1817     if (rt->server_type == RTSP_SERVER_REAL) {
1818         int i;
1819         enum AVDiscard cache[MAX_STREAMS];
1820
1821         for (i = 0; i < s->nb_streams; i++)
1822             cache[i] = s->streams[i]->discard;
1823
1824         if (!rt->need_subscription) {
1825             if (memcmp (cache, rt->real_setup_cache,
1826                         sizeof(enum AVDiscard) * s->nb_streams)) {
1827                 snprintf(cmd, sizeof(cmd),
1828                          "Unsubscribe: %s\r\n",
1829                          rt->last_subscription);
1830                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1831                                  cmd, reply, NULL);
1832                 if (reply->status_code != RTSP_STATUS_OK)
1833                     return AVERROR_INVALIDDATA;
1834                 rt->need_subscription = 1;
1835             }
1836         }
1837
1838         if (rt->need_subscription) {
1839             int r, rule_nr, first = 1;
1840
1841             memcpy(rt->real_setup_cache, cache,
1842                    sizeof(enum AVDiscard) * s->nb_streams);
1843             rt->last_subscription[0] = 0;
1844
1845             snprintf(cmd, sizeof(cmd),
1846                      "Subscribe: ");
1847             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1848                 rule_nr = 0;
1849                 for (r = 0; r < s->nb_streams; r++) {
1850                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1851                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1852                             if (!first)
1853                                 av_strlcat(rt->last_subscription, ",",
1854                                            sizeof(rt->last_subscription));
1855                             ff_rdt_subscribe_rule(
1856                                 rt->last_subscription,
1857                                 sizeof(rt->last_subscription), i, rule_nr);
1858                             first = 0;
1859                         }
1860                         rule_nr++;
1861                     }
1862                 }
1863             }
1864             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1865             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1866                              cmd, reply, NULL);
1867             if (reply->status_code != RTSP_STATUS_OK)
1868                 return AVERROR_INVALIDDATA;
1869             rt->need_subscription = 0;
1870
1871             if (rt->state == RTSP_STATE_STREAMING)
1872                 rtsp_read_play (s);
1873         }
1874     }
1875
1876     ret = rtsp_fetch_packet(s, pkt);
1877     if (ret < 0)
1878         return ret;
1879
1880     /* send dummy request to keep TCP connection alive */
1881     if ((rt->server_type == RTSP_SERVER_WMS ||
1882          rt->server_type == RTSP_SERVER_REAL) &&
1883         (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1884         if (rt->server_type == RTSP_SERVER_WMS) {
1885             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
1886         } else {
1887             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
1888         }
1889     }
1890
1891     return 0;
1892 }
1893
1894 /* pause the stream */
1895 static int rtsp_read_pause(AVFormatContext *s)
1896 {
1897     RTSPState *rt = s->priv_data;
1898     RTSPMessageHeader reply1, *reply = &reply1;
1899
1900     if (rt->state != RTSP_STATE_STREAMING)
1901         return 0;
1902     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1903         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
1904         if (reply->status_code != RTSP_STATUS_OK) {
1905             return -1;
1906         }
1907     }
1908     rt->state = RTSP_STATE_PAUSED;
1909     return 0;
1910 }
1911
1912 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1913                           int64_t timestamp, int flags)
1914 {
1915     RTSPState *rt = s->priv_data;
1916
1917     rt->seek_timestamp = av_rescale_q(timestamp,
1918                                       s->streams[stream_index]->time_base,
1919                                       AV_TIME_BASE_Q);
1920     switch(rt->state) {
1921     default:
1922     case RTSP_STATE_IDLE:
1923         break;
1924     case RTSP_STATE_STREAMING:
1925         if (rtsp_read_pause(s) != 0)
1926             return -1;
1927         rt->state = RTSP_STATE_SEEKING;
1928         if (rtsp_read_play(s) != 0)
1929             return -1;
1930         break;
1931     case RTSP_STATE_PAUSED:
1932         rt->state = RTSP_STATE_IDLE;
1933         break;
1934     }
1935     return 0;
1936 }
1937
1938 static int rtsp_read_close(AVFormatContext *s)
1939 {
1940     RTSPState *rt = s->priv_data;
1941
1942 #if 0
1943     /* NOTE: it is valid to flush the buffer here */
1944     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1945         url_fclose(&rt->rtsp_gb);
1946     }
1947 #endif
1948     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
1949
1950     ff_rtsp_close_streams(s);
1951     url_close(rt->rtsp_hd);
1952     ff_network_close();
1953     return 0;
1954 }
1955
1956 AVInputFormat rtsp_demuxer = {
1957     "rtsp",
1958     NULL_IF_CONFIG_SMALL("RTSP input format"),
1959     sizeof(RTSPState),
1960     rtsp_probe,
1961     rtsp_read_header,
1962     rtsp_read_packet,
1963     rtsp_read_close,
1964     rtsp_read_seek,
1965     .flags = AVFMT_NOFILE,
1966     .read_play = rtsp_read_play,
1967     .read_pause = rtsp_read_pause,
1968 };
1969 #endif
1970
1971 static int sdp_probe(AVProbeData *p1)
1972 {
1973     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1974
1975     /* we look for a line beginning "c=IN IP4" */
1976     while (p < p_end && *p != '\0') {
1977         if (p + sizeof("c=IN IP4") - 1 < p_end &&
1978             av_strstart(p, "c=IN IP4", NULL))
1979             return AVPROBE_SCORE_MAX / 2;
1980
1981         while (p < p_end - 1 && *p != '\n') p++;
1982         if (++p >= p_end)
1983             break;
1984         if (*p == '\r')
1985             p++;
1986     }
1987     return 0;
1988 }
1989
1990 #define SDP_MAX_SIZE 8192
1991
1992 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1993 {
1994     RTSPState *rt = s->priv_data;
1995     RTSPStream *rtsp_st;
1996     int size, i, err;
1997     char *content;
1998     char url[1024];
1999
2000     if (!ff_network_init())
2001         return AVERROR(EIO);
2002
2003     /* read the whole sdp file */
2004     /* XXX: better loading */
2005     content = av_malloc(SDP_MAX_SIZE);
2006     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
2007     if (size <= 0) {
2008         av_free(content);
2009         return AVERROR_INVALIDDATA;
2010     }
2011     content[size] ='\0';
2012
2013     sdp_parse(s, content);
2014     av_free(content);
2015
2016     /* open each RTP stream */
2017     for (i = 0; i < rt->nb_rtsp_streams; i++) {
2018         rtsp_st = rt->rtsp_streams[i];
2019
2020         ff_url_join(url, sizeof(url), "rtp", NULL,
2021                     inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
2022                     "?localport=%d&ttl=%d", rtsp_st->sdp_port,
2023                     rtsp_st->sdp_ttl);
2024         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
2025             err = AVERROR_INVALIDDATA;
2026             goto fail;
2027         }
2028         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
2029             goto fail;
2030     }
2031     return 0;
2032 fail:
2033     ff_rtsp_close_streams(s);
2034     ff_network_close();
2035     return err;
2036 }
2037
2038 static int sdp_read_close(AVFormatContext *s)
2039 {
2040     ff_rtsp_close_streams(s);
2041     ff_network_close();
2042     return 0;
2043 }
2044
2045 AVInputFormat sdp_demuxer = {
2046     "sdp",
2047     NULL_IF_CONFIG_SMALL("SDP"),
2048     sizeof(RTSPState),
2049     sdp_probe,
2050     sdp_read_header,
2051     rtsp_fetch_packet,
2052     sdp_read_close,
2053 };