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 "libavutil/random_seed.h"
  26 #include "avformat.h"
  27
  28 #include <sys/time.h>
  29 #if HAVE_SYS_SELECT_H
  30 #include <sys/select.h>
  31 #endif
  32 #include <strings.h>
  33 #include "internal.h"
  34 #include "network.h"
  35 #include "os_support.h"
  36 #include "http.h"
  37 #include "rtsp.h"
  38
  39 #include "rtpdec.h"
  40 #include "rdt.h"
  41 #include "rtpdec_formats.h"
  42
  43 //#define DEBUG
  44 //#define DEBUG_RTP_TCP
  45
  46 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
  47 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
  48 #endif
  49
  50 /* Timeout values for socket select, in ms,
  51  * and read_packet(), in seconds  */
  52 #define SELECT_TIMEOUT_MS 100
  53 #define READ_PACKET_TIMEOUT_S 10
  54 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / SELECT_TIMEOUT_MS
  55 #define SDP_MAX_SIZE 16384
  56
  57 static void get_word_until_chars(char *buf, int buf_size,
  58                                  const char *sep, const char **pp)
  59 {
  60     const char *p;
  61     char *q;
  62
  63     p = *pp;
  64     p += strspn(p, SPACE_CHARS);
  65     q = buf;
  66     while (!strchr(sep, *p) && *p != '\0') {
  67         if ((q - buf) < buf_size - 1)
  68             *q++ = *p;
  69         p++;
  70     }
  71     if (buf_size > 0)
  72         *q = '\0';
  73     *pp = p;
  74 }
  75
  76 static void get_word_sep(char *buf, int buf_size, const char *sep,
  77                          const char **pp)
  78 {
  79     if (**pp == '/') (*pp)++;
  80     get_word_until_chars(buf, buf_size, sep, pp);
  81 }
  82
  83 static void get_word(char *buf, int buf_size, const char **pp)
  84 {
  85     get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
  86 }
  87
  88 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
  89 static int sdp_parse_rtpmap(AVFormatContext *s,
  90                             AVCodecContext *codec, RTSPStream *rtsp_st,
  91                             int payload_type, const char *p)
  92 {
  93     char buf[256];
  94     int i;
  95     AVCodec *c;
  96     const char *c_name;
  97
  98     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
  99      * see if we can handle this kind of payload.
 100      * The space should normally not be there but some Real streams or
 101      * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
 102      * have a trailing space. */
 103     get_word_sep(buf, sizeof(buf), "/ ", &p);
 104     if (payload_type >= RTP_PT_PRIVATE) {
 105         RTPDynamicProtocolHandler *handler;
 106         for (handler = RTPFirstDynamicPayloadHandler;
 107              handler; handler = handler->next) {
 108             if (!strcasecmp(buf, handler->enc_name) &&
 109                 codec->codec_type == handler->codec_type) {
 110                 codec->codec_id          = handler->codec_id;
 111                 rtsp_st->dynamic_handler = handler;
 112                 if (handler->open)
 113                     rtsp_st->dynamic_protocol_context = handler->open();
 114                 break;
 115             }
 116         }
 117     } else {
 118         /* We are in a standard case
 119          * (from http://www.iana.org/assignments/rtp-parameters). */
 120         /* search into AVRtpPayloadTypes[] */
 121         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 122     }
 123
 124     c = avcodec_find_decoder(codec->codec_id);
 125     if (c && c->name)
 126         c_name = c->name;
 127     else
 128         c_name = "(null)";
 129
 130     get_word_sep(buf, sizeof(buf), "/", &p);
 131     i = atoi(buf);
 132     switch (codec->codec_type) {
 133     case AVMEDIA_TYPE_AUDIO:
 134         av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
 135         codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 136         codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 137         if (i > 0) {
 138             codec->sample_rate = i;
 139             get_word_sep(buf, sizeof(buf), "/", &p);
 140             i = atoi(buf);
 141             if (i > 0)
 142                 codec->channels = i;
 143             // TODO: there is a bug here; if it is a mono stream, and
 144             // less than 22000Hz, faad upconverts to stereo and twice
 145             // the frequency.  No problem, but the sample rate is being
 146             // set here by the sdp line. Patch on its way. (rdm)
 147         }
 148         av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
 149                codec->sample_rate);
 150         av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
 151                codec->channels);
 152         break;
 153     case AVMEDIA_TYPE_VIDEO:
 154         av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
 155         break;
 156     default:
 157         break;
 158     }
 159     return 0;
 160 }
 161
 162 /* parse the attribute line from the fmtp a line of an sdp response. This
 163  * is broken out as a function because it is used in rtp_h264.c, which is
 164  * forthcoming. */
 165 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
 166                                 char *value, int value_size)
 167 {
 168     *p += strspn(*p, SPACE_CHARS);
 169     if (**p) {
 170         get_word_sep(attr, attr_size, "=", p);
 171         if (**p == '=')
 172             (*p)++;
 173         get_word_sep(value, value_size, ";", p);
 174         if (**p == ';')
 175             (*p)++;
 176         return 1;
 177     }
 178     return 0;
 179 }
 180
 181 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
 182  *  and end time.
 183  *  Used for seeking in the rtp stream.
 184  */
 185 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 186 {
 187     char buf[256];
 188
 189     p += strspn(p, SPACE_CHARS);
 190     if (!av_stristart(p, "npt=", &p))
 191         return;
 192
 193     *start = AV_NOPTS_VALUE;
 194     *end = AV_NOPTS_VALUE;
 195
 196     get_word_sep(buf, sizeof(buf), "-", &p);
 197     *start = parse_date(buf, 1);
 198     if (*p == '-') {
 199         p++;
 200         get_word_sep(buf, sizeof(buf), "-", &p);
 201         *end = parse_date(buf, 1);
 202     }
 203 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 204 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 205 }
 206
 207 typedef struct SDPParseState {
 208     /* SDP only */
 209     struct in_addr default_ip;
 210     int            default_ttl;
 211     int            skip_media;  ///< set if an unknown m= line occurs
 212 } SDPParseState;
 213
 214 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 215                            int letter, const char *buf)
 216 {
 217     RTSPState *rt = s->priv_data;
 218     char buf1[64], st_type[64];
 219     const char *p;
 220     enum AVMediaType codec_type;
 221     int payload_type, i;
 222     AVStream *st;
 223     RTSPStream *rtsp_st;
 224     struct in_addr sdp_ip;
 225     int ttl;
 226
 227     dprintf(s, "sdp: %c='%s'\n", letter, buf);
 228
 229     p = buf;
 230     if (s1->skip_media && letter != 'm')
 231         return;
 232     switch (letter) {
 233     case 'c':
 234         get_word(buf1, sizeof(buf1), &p);
 235         if (strcmp(buf1, "IN") != 0)
 236             return;
 237         get_word(buf1, sizeof(buf1), &p);
 238         if (strcmp(buf1, "IP4") != 0)
 239             return;
 240         get_word_sep(buf1, sizeof(buf1), "/", &p);
 241         if (ff_inet_aton(buf1, &sdp_ip) == 0)
 242             return;
 243         ttl = 16;
 244         if (*p == '/') {
 245             p++;
 246             get_word_sep(buf1, sizeof(buf1), "/", &p);
 247             ttl = atoi(buf1);
 248         }
 249         if (s->nb_streams == 0) {
 250             s1->default_ip = sdp_ip;
 251             s1->default_ttl = ttl;
 252         } else {
 253             st = s->streams[s->nb_streams - 1];
 254             rtsp_st = st->priv_data;
 255             rtsp_st->sdp_ip = sdp_ip;
 256             rtsp_st->sdp_ttl = ttl;
 257         }
 258         break;
 259     case 's':
 260         av_metadata_set2(&s->metadata, "title", p, 0);
 261         break;
 262     case 'i':
 263         if (s->nb_streams == 0) {
 264             av_metadata_set2(&s->metadata, "comment", p, 0);
 265             break;
 266         }
 267         break;
 268     case 'm':
 269         /* new stream */
 270         s1->skip_media = 0;
 271         get_word(st_type, sizeof(st_type), &p);
 272         if (!strcmp(st_type, "audio")) {
 273             codec_type = AVMEDIA_TYPE_AUDIO;
 274         } else if (!strcmp(st_type, "video")) {
 275             codec_type = AVMEDIA_TYPE_VIDEO;
 276         } else if (!strcmp(st_type, "application")) {
 277             codec_type = AVMEDIA_TYPE_DATA;
 278         } else {
 279             s1->skip_media = 1;
 280             return;
 281         }
 282         rtsp_st = av_mallocz(sizeof(RTSPStream));
 283         if (!rtsp_st)
 284             return;
 285         rtsp_st->stream_index = -1;
 286         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 287
 288         rtsp_st->sdp_ip = s1->default_ip;
 289         rtsp_st->sdp_ttl = s1->default_ttl;
 290
 291         get_word(buf1, sizeof(buf1), &p); /* port */
 292         rtsp_st->sdp_port = atoi(buf1);
 293
 294         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 295
 296         /* XXX: handle list of formats */
 297         get_word(buf1, sizeof(buf1), &p); /* format list */
 298         rtsp_st->sdp_payload_type = atoi(buf1);
 299
 300         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 301             /* no corresponding stream */
 302         } else {
 303             st = av_new_stream(s, 0);
 304             if (!st)
 305                 return;
 306             st->priv_data = rtsp_st;
 307             rtsp_st->stream_index = st->index;
 308             st->codec->codec_type = codec_type;
 309             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 310                 /* if standard payload type, we can find the codec right now */
 311                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 312             }
 313         }
 314         /* put a default control url */
 315         av_strlcpy(rtsp_st->control_url, rt->control_uri,
 316                    sizeof(rtsp_st->control_url));
 317         break;
 318     case 'a':
 319         if (av_strstart(p, "control:", &p)) {
 320             if (s->nb_streams == 0) {
 321                 if (!strncmp(p, "rtsp://", 7))
 322                     av_strlcpy(rt->control_uri, p,
 323                                sizeof(rt->control_uri));
 324             } else {
 325             char proto[32];
 326             /* get the control url */
 327             st = s->streams[s->nb_streams - 1];
 328             rtsp_st = st->priv_data;
 329
 330             /* XXX: may need to add full url resolution */
 331             av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
 332                          NULL, NULL, 0, p);
 333             if (proto[0] == '\0') {
 334                 /* relative control URL */
 335                 if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
 336                 av_strlcat(rtsp_st->control_url, "/",
 337                            sizeof(rtsp_st->control_url));
 338                 av_strlcat(rtsp_st->control_url, p,
 339                            sizeof(rtsp_st->control_url));
 340             } else
 341                 av_strlcpy(rtsp_st->control_url, p,
 342                            sizeof(rtsp_st->control_url));
 343             }
 344         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 345             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 346             get_word(buf1, sizeof(buf1), &p);
 347             payload_type = atoi(buf1);
 348             st = s->streams[s->nb_streams - 1];
 349             rtsp_st = st->priv_data;
 350             sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
 351         } else if (av_strstart(p, "fmtp:", &p) ||
 352                    av_strstart(p, "framesize:", &p)) {
 353             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 354             // let dynamic protocol handlers have a stab at the line.
 355             get_word(buf1, sizeof(buf1), &p);
 356             payload_type = atoi(buf1);
 357             for (i = 0; i < s->nb_streams; i++) {
 358                 st      = s->streams[i];
 359                 rtsp_st = st->priv_data;
 360                 if (rtsp_st->sdp_payload_type == payload_type &&
 361                     rtsp_st->dynamic_handler &&
 362                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 363                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
 364                         rtsp_st->dynamic_protocol_context, buf);
 365             }
 366         } else if (av_strstart(p, "range:", &p)) {
 367             int64_t start, end;
 368
 369             // this is so that seeking on a streamed file can work.
 370             rtsp_parse_range_npt(p, &start, &end);
 371             s->start_time = start;
 372             /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
 373             s->duration   = (end == AV_NOPTS_VALUE) ?
 374                             AV_NOPTS_VALUE : end - start;
 375         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 376             if (atoi(p) == 1)
 377                 rt->transport = RTSP_TRANSPORT_RDT;
 378         } else {
 379             if (rt->server_type == RTSP_SERVER_WMS)
 380                 ff_wms_parse_sdp_a_line(s, p);
 381             if (s->nb_streams > 0) {
 382                 if (rt->server_type == RTSP_SERVER_REAL)
 383                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 384
 385                 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
 386                 if (rtsp_st->dynamic_handler &&
 387                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 388                     rtsp_st->dynamic_handler->parse_sdp_a_line(s,
 389                         s->nb_streams - 1,
 390                         rtsp_st->dynamic_protocol_context, buf);
 391             }
 392         }
 393         break;
 394     }
 395 }
 396
 397 static int sdp_parse(AVFormatContext *s, const char *content)
 398 {
 399     const char *p;
 400     int letter;
 401     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 402      * contain long SDP lines containing complete ASF Headers (several
 403      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 404      * "rulebooks" describing their properties. Therefore, the SDP line
 405      * buffer is large.
 406      *
 407      * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
 408      * in rtpdec_xiph.c. */
 409     char buf[16384], *q;
 410     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 411
 412     memset(s1, 0, sizeof(SDPParseState));
 413     p = content;
 414     for (;;) {
 415         p += strspn(p, SPACE_CHARS);
 416         letter = *p;
 417         if (letter == '\0')
 418             break;
 419         p++;
 420         if (*p != '=')
 421             goto next_line;
 422         p++;
 423         /* get the content */
 424         q = buf;
 425         while (*p != '\n' && *p != '\r' && *p != '\0') {
 426             if ((q - buf) < sizeof(buf) - 1)
 427                 *q++ = *p;
 428             p++;
 429         }
 430         *q = '\0';
 431         sdp_parse_line(s, s1, letter, buf);
 432     next_line:
 433         while (*p != '\n' && *p != '\0')
 434             p++;
 435         if (*p == '\n')
 436             p++;
 437     }
 438     return 0;
 439 }
 440
 441 /* close and free RTSP streams */
 442 void ff_rtsp_close_streams(AVFormatContext *s)
 443 {
 444     RTSPState *rt = s->priv_data;
 445     int i;
 446     RTSPStream *rtsp_st;
 447
 448     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 449         rtsp_st = rt->rtsp_streams[i];
 450         if (rtsp_st) {
 451             if (rtsp_st->transport_priv) {
 452                 if (s->oformat) {
 453                     AVFormatContext *rtpctx = rtsp_st->transport_priv;
 454                     av_write_trailer(rtpctx);
 455                     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 456                         uint8_t *ptr;
 457                         url_close_dyn_buf(rtpctx->pb, &ptr);
 458                         av_free(ptr);
 459                     } else {
 460                         url_fclose(rtpctx->pb);
 461                     }
 462                     av_metadata_free(&rtpctx->streams[0]->metadata);
 463                     av_metadata_free(&rtpctx->metadata);
 464                     av_free(rtpctx->streams[0]);
 465                     av_free(rtpctx);
 466                 } else if (rt->transport == RTSP_TRANSPORT_RDT)
 467                     ff_rdt_parse_close(rtsp_st->transport_priv);
 468                 else
 469                     rtp_parse_close(rtsp_st->transport_priv);
 470             }
 471             if (rtsp_st->rtp_handle)
 472                 url_close(rtsp_st->rtp_handle);
 473             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 474                 rtsp_st->dynamic_handler->close(
 475                     rtsp_st->dynamic_protocol_context);
 476         }
 477     }
 478     av_free(rt->rtsp_streams);
 479     if (rt->asf_ctx) {
 480         av_close_input_stream (rt->asf_ctx);
 481         rt->asf_ctx = NULL;
 482     }
 483 }
 484
 485 static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st,
 486                                URLContext *handle)
 487 {
 488     RTSPState *rt = s->priv_data;
 489     AVFormatContext *rtpctx;
 490     int ret;
 491     AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
 492
 493     if (!rtp_format)
 494         return NULL;
 495
 496     /* Allocate an AVFormatContext for each output stream */
 497     rtpctx = avformat_alloc_context();
 498     if (!rtpctx)
 499         return NULL;
 500
 501     rtpctx->oformat = rtp_format;
 502     if (!av_new_stream(rtpctx, 0)) {
 503         av_free(rtpctx);
 504         return NULL;
 505     }
 506     /* Copy the max delay setting; the rtp muxer reads this. */
 507     rtpctx->max_delay = s->max_delay;
 508     /* Copy other stream parameters. */
 509     rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
 510
 511     /* Set the synchronized start time. */
 512     rtpctx->start_time_realtime = rt->start_time;
 513
 514     /* Remove the local codec, link to the original codec
 515      * context instead, to give the rtp muxer access to
 516      * codec parameters. */
 517     av_free(rtpctx->streams[0]->codec);
 518     rtpctx->streams[0]->codec = st->codec;
 519
 520     if (handle) {
 521         url_fdopen(&rtpctx->pb, handle);
 522     } else
 523         url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
 524     ret = av_write_header(rtpctx);
 525
 526     if (ret) {
 527         if (handle) {
 528             url_fclose(rtpctx->pb);
 529         } else {
 530             uint8_t *ptr;
 531             url_close_dyn_buf(rtpctx->pb, &ptr);
 532             av_free(ptr);
 533         }
 534         av_free(rtpctx->streams[0]);
 535         av_free(rtpctx);
 536         return NULL;
 537     }
 538
 539     /* Copy the RTP AVStream timebase back to the original AVStream */
 540     st->time_base = rtpctx->streams[0]->time_base;
 541     return rtpctx;
 542 }
 543
 544 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 545 {
 546     RTSPState *rt = s->priv_data;
 547     AVStream *st = NULL;
 548
 549     /* open the RTP context */
 550     if (rtsp_st->stream_index >= 0)
 551         st = s->streams[rtsp_st->stream_index];
 552     if (!st)
 553         s->ctx_flags |= AVFMTCTX_NOHEADER;
 554
 555     if (s->oformat) {
 556         rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
 557         /* Ownership of rtp_handle is passed to the rtp mux context */
 558         rtsp_st->rtp_handle = NULL;
 559     } else if (rt->transport == RTSP_TRANSPORT_RDT)
 560         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 561                                             rtsp_st->dynamic_protocol_context,
 562                                             rtsp_st->dynamic_handler);
 563     else
 564         rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
 565                                          rtsp_st->sdp_payload_type);
 566
 567     if (!rtsp_st->transport_priv) {
 568          return AVERROR(ENOMEM);
 569     } else if (rt->transport != RTSP_TRANSPORT_RDT) {
 570         if (rtsp_st->dynamic_handler) {
 571             rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 572                                            rtsp_st->dynamic_protocol_context,
 573                                            rtsp_st->dynamic_handler);
 574         }
 575     }
 576
 577     return 0;
 578 }
 579
 580 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
 581 static int rtsp_probe(AVProbeData *p)
 582 {
 583     if (av_strstart(p->filename, "rtsp:", NULL))
 584         return AVPROBE_SCORE_MAX;
 585     return 0;
 586 }
 587
 588 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 589 {
 590     const char *p;
 591     int v;
 592
 593     p = *pp;
 594     p += strspn(p, SPACE_CHARS);
 595     v = strtol(p, (char **)&p, 10);
 596     if (*p == '-') {
 597         p++;
 598         *min_ptr = v;
 599         v = strtol(p, (char **)&p, 10);
 600         *max_ptr = v;
 601     } else {
 602         *min_ptr = v;
 603         *max_ptr = v;
 604     }
 605     *pp = p;
 606 }
 607
 608 /* XXX: only one transport specification is parsed */
 609 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
 610 {
 611     char transport_protocol[16];
 612     char profile[16];
 613     char lower_transport[16];
 614     char parameter[16];
 615     RTSPTransportField *th;
 616     char buf[256];
 617
 618     reply->nb_transports = 0;
 619
 620     for (;;) {
 621         p += strspn(p, SPACE_CHARS);
 622         if (*p == '\0')
 623             break;
 624
 625         th = &reply->transports[reply->nb_transports];
 626
 627         get_word_sep(transport_protocol, sizeof(transport_protocol),
 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                 get_word_sep(lower_transport, sizeof(lower_transport),
 635                              ";,", &p);
 636             }
 637             th->transport = RTSP_TRANSPORT_RTP;
 638         } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
 639                    !strcasecmp (transport_protocol, "x-real-rdt")) {
 640             /* x-pn-tng/<protocol> */
 641             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 642             profile[0] = '\0';
 643             th->transport = RTSP_TRANSPORT_RDT;
 644         }
 645         if (!strcasecmp(lower_transport, "TCP"))
 646             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 647         else
 648             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 649
 650         if (*p == ';')
 651             p++;
 652         /* get each parameter */
 653         while (*p != '\0' && *p != ',') {
 654             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 655             if (!strcmp(parameter, "port")) {
 656                 if (*p == '=') {
 657                     p++;
 658                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 659                 }
 660             } else if (!strcmp(parameter, "client_port")) {
 661                 if (*p == '=') {
 662                     p++;
 663                     rtsp_parse_range(&th->client_port_min,
 664                                      &th->client_port_max, &p);
 665                 }
 666             } else if (!strcmp(parameter, "server_port")) {
 667                 if (*p == '=') {
 668                     p++;
 669                     rtsp_parse_range(&th->server_port_min,
 670                                      &th->server_port_max, &p);
 671                 }
 672             } else if (!strcmp(parameter, "interleaved")) {
 673                 if (*p == '=') {
 674                     p++;
 675                     rtsp_parse_range(&th->interleaved_min,
 676                                      &th->interleaved_max, &p);
 677                 }
 678             } else if (!strcmp(parameter, "multicast")) {
 679                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 680                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 681             } else if (!strcmp(parameter, "ttl")) {
 682                 if (*p == '=') {
 683                     p++;
 684                     th->ttl = strtol(p, (char **)&p, 10);
 685                 }
 686             } else if (!strcmp(parameter, "destination")) {
 687                 struct in_addr ipaddr;
 688
 689                 if (*p == '=') {
 690                     p++;
 691                     get_word_sep(buf, sizeof(buf), ";,", &p);
 692                     if (ff_inet_aton(buf, &ipaddr))
 693                         th->destination = ntohl(ipaddr.s_addr);
 694                 }
 695             }
 696             while (*p != ';' && *p != '\0' && *p != ',')
 697                 p++;
 698             if (*p == ';')
 699                 p++;
 700         }
 701         if (*p == ',')
 702             p++;
 703
 704         reply->nb_transports++;
 705     }
 706 }
 707
 708 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
 709                         HTTPAuthState *auth_state)
 710 {
 711     const char *p;
 712
 713     /* NOTE: we do case independent match for broken servers */
 714     p = buf;
 715     if (av_stristart(p, "Session:", &p)) {
 716         int t;
 717         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 718         if (av_stristart(p, ";timeout=", &p) &&
 719             (t = strtol(p, NULL, 10)) > 0) {
 720             reply->timeout = t;
 721         }
 722     } else if (av_stristart(p, "Content-Length:", &p)) {
 723         reply->content_length = strtol(p, NULL, 10);
 724     } else if (av_stristart(p, "Transport:", &p)) {
 725         rtsp_parse_transport(reply, p);
 726     } else if (av_stristart(p, "CSeq:", &p)) {
 727         reply->seq = strtol(p, NULL, 10);
 728     } else if (av_stristart(p, "Range:", &p)) {
 729         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 730     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 731         p += strspn(p, SPACE_CHARS);
 732         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 733     } else if (av_stristart(p, "Server:", &p)) {
 734         p += strspn(p, SPACE_CHARS);
 735         av_strlcpy(reply->server, p, sizeof(reply->server));
 736     } else if (av_stristart(p, "Notice:", &p) ||
 737                av_stristart(p, "X-Notice:", &p)) {
 738         reply->notice = strtol(p, NULL, 10);
 739     } else if (av_stristart(p, "Location:", &p)) {
 740         p += strspn(p, SPACE_CHARS);
 741         av_strlcpy(reply->location, p , sizeof(reply->location));
 742     } else if (av_stristart(p, "WWW-Authenticate:", &p) && auth_state) {
 743         p += strspn(p, SPACE_CHARS);
 744         ff_http_auth_handle_header(auth_state, "WWW-Authenticate", p);
 745     } else if (av_stristart(p, "Authentication-Info:", &p) && auth_state) {
 746         p += strspn(p, SPACE_CHARS);
 747         ff_http_auth_handle_header(auth_state, "Authentication-Info", p);
 748     }
 749 }
 750
 751 /* skip a RTP/TCP interleaved packet */
 752 void ff_rtsp_skip_packet(AVFormatContext *s)
 753 {
 754     RTSPState *rt = s->priv_data;
 755     int ret, len, len1;
 756     uint8_t buf[1024];
 757
 758     ret = url_read_complete(rt->rtsp_hd, buf, 3);
 759     if (ret != 3)
 760         return;
 761     len = AV_RB16(buf + 1);
 762
 763     dprintf(s, "skipping RTP packet len=%d\n", len);
 764
 765     /* skip payload */
 766     while (len > 0) {
 767         len1 = len;
 768         if (len1 > sizeof(buf))
 769             len1 = sizeof(buf);
 770         ret = url_read_complete(rt->rtsp_hd, buf, len1);
 771         if (ret != len1)
 772             return;
 773         len -= len1;
 774     }
 775 }
 776
 777 int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
 778                        unsigned char **content_ptr,
 779                        int return_on_interleaved_data)
 780 {
 781     RTSPState *rt = s->priv_data;
 782     char buf[4096], buf1[1024], *q;
 783     unsigned char ch;
 784     const char *p;
 785     int ret, content_length, line_count = 0;
 786     unsigned char *content = NULL;
 787
 788     memset(reply, 0, sizeof(*reply));
 789
 790     /* parse reply (XXX: use buffers) */
 791     rt->last_reply[0] = '\0';
 792     for (;;) {
 793         q = buf;
 794         for (;;) {
 795             ret = url_read_complete(rt->rtsp_hd, &ch, 1);
 796 #ifdef DEBUG_RTP_TCP
 797             dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
 798 #endif
 799             if (ret != 1)
 800                 return AVERROR_EOF;
 801             if (ch == '\n')
 802                 break;
 803             if (ch == '$') {
 804                 /* XXX: only parse it if first char on line ? */
 805                 if (return_on_interleaved_data) {
 806                     return 1;
 807                 } else
 808                     ff_rtsp_skip_packet(s);
 809             } else if (ch != '\r') {
 810                 if ((q - buf) < sizeof(buf) - 1)
 811                     *q++ = ch;
 812             }
 813         }
 814         *q = '\0';
 815
 816         dprintf(s, "line='%s'\n", buf);
 817
 818         /* test if last line */
 819         if (buf[0] == '\0')
 820             break;
 821         p = buf;
 822         if (line_count == 0) {
 823             /* get reply code */
 824             get_word(buf1, sizeof(buf1), &p);
 825             get_word(buf1, sizeof(buf1), &p);
 826             reply->status_code = atoi(buf1);
 827             av_strlcpy(reply->reason, p, sizeof(reply->reason));
 828         } else {
 829             ff_rtsp_parse_line(reply, p, &rt->auth_state);
 830             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 831             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 832         }
 833         line_count++;
 834     }
 835
 836     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 837         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 838
 839     content_length = reply->content_length;
 840     if (content_length > 0) {
 841         /* leave some room for a trailing '\0' (useful for simple parsing) */
 842         content = av_malloc(content_length + 1);
 843         (void)url_read_complete(rt->rtsp_hd, content, content_length);
 844         content[content_length] = '\0';
 845     }
 846     if (content_ptr)
 847         *content_ptr = content;
 848     else
 849         av_free(content);
 850
 851     if (rt->seq != reply->seq) {
 852         av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
 853             rt->seq, reply->seq);
 854     }
 855
 856     /* EOS */
 857     if (reply->notice == 2101 /* End-of-Stream Reached */      ||
 858         reply->notice == 2104 /* Start-of-Stream Reached */    ||
 859         reply->notice == 2306 /* Continuous Feed Terminated */) {
 860         rt->state = RTSP_STATE_IDLE;
 861     } else if (reply->notice >= 4400 && reply->notice < 5500) {
 862         return AVERROR(EIO); /* data or server error */
 863     } else if (reply->notice == 2401 /* Ticket Expired */ ||
 864              (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
 865         return AVERROR(EPERM);
 866
 867     return 0;
 868 }
 869
 870 int ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
 871                                         const char *method, const char *url,
 872                                         const char *headers,
 873                                         const unsigned char *send_content,
 874                                         int send_content_length)
 875 {
 876     RTSPState *rt = s->priv_data;
 877     char buf[4096], *out_buf;
 878     char base64buf[AV_BASE64_SIZE(sizeof(buf))];
 879
 880     /* Add in RTSP headers */
 881     out_buf = buf;
 882     rt->seq++;
 883     snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
 884     if (headers)
 885         av_strlcat(buf, headers, sizeof(buf));
 886     av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
 887     if (rt->session_id[0] != '\0' && (!headers ||
 888         !strstr(headers, "\nIf-Match:"))) {
 889         av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
 890     }
 891     if (rt->auth[0]) {
 892         char *str = ff_http_auth_create_response(&rt->auth_state,
 893                                                  rt->auth, url, method);
 894         if (str)
 895             av_strlcat(buf, str, sizeof(buf));
 896         av_free(str);
 897     }
 898     if (send_content_length > 0 && send_content)
 899         av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
 900     av_strlcat(buf, "\r\n", sizeof(buf));
 901
 902     /* base64 encode rtsp if tunneling */
 903     if (rt->control_transport == RTSP_MODE_TUNNEL) {
 904         av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
 905         out_buf = base64buf;
 906     }
 907
 908     dprintf(s, "Sending:\n%s--\n", buf);
 909
 910     url_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
 911     if (send_content_length > 0 && send_content) {
 912         if (rt->control_transport == RTSP_MODE_TUNNEL) {
 913             av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
 914                                     "with content data not supported\n");
 915             return AVERROR_PATCHWELCOME;
 916         }
 917         url_write(rt->rtsp_hd_out, send_content, send_content_length);
 918     }
 919     rt->last_cmd_time = av_gettime();
 920
 921     return 0;
 922 }
 923
 924 int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
 925                            const char *url, const char *headers)
 926 {
 927     return ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
 928 }
 929
 930 int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
 931                      const char *headers, RTSPMessageHeader *reply,
 932                      unsigned char **content_ptr)
 933 {
 934     return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
 935                                          content_ptr, NULL, 0);
 936 }
 937
 938 int ff_rtsp_send_cmd_with_content(AVFormatContext *s,
 939                                   const char *method, const char *url,
 940                                   const char *header,
 941                                   RTSPMessageHeader *reply,
 942                                   unsigned char **content_ptr,
 943                                   const unsigned char *send_content,
 944                                   int send_content_length)
 945 {
 946     RTSPState *rt = s->priv_data;
 947     HTTPAuthType cur_auth_type;
 948     int ret;
 949
 950 retry:
 951     cur_auth_type = rt->auth_state.auth_type;
 952     if ((ret = ff_rtsp_send_cmd_with_content_async(s, method, url, header,
 953                                                    send_content,
 954                                                    send_content_length)))
 955         return ret;
 956
 957     if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0) ) < 0)
 958         return ret;
 959
 960     if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
 961         rt->auth_state.auth_type != HTTP_AUTH_NONE)
 962         goto retry;
 963
 964     if (reply->status_code > 400){
 965         av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
 966                method,
 967                reply->status_code,
 968                reply->reason);
 969         av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
 970     }
 971
 972     return 0;
 973 }
 974
 975 /**
 976  * @return 0 on success, <0 on error, 1 if protocol is unavailable.
 977  */
 978 static int make_setup_request(AVFormatContext *s, const char *host, int port,
 979                               int lower_transport, const char *real_challenge)
 980 {
 981     RTSPState *rt = s->priv_data;
 982     int rtx, j, i, err, interleave = 0;
 983     RTSPStream *rtsp_st;
 984     RTSPMessageHeader reply1, *reply = &reply1;
 985     char cmd[2048];
 986     const char *trans_pref;
 987
 988     if (rt->transport == RTSP_TRANSPORT_RDT)
 989         trans_pref = "x-pn-tng";
 990     else
 991         trans_pref = "RTP/AVP";
 992
 993     /* default timeout: 1 minute */
 994     rt->timeout = 60;
 995
 996     /* for each stream, make the setup request */
 997     /* XXX: we assume the same server is used for the control of each
 998      * RTSP stream */
 999
1000     for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1001         char transport[2048];
1002
1003         /**
1004          * WMS serves all UDP data over a single connection, the RTX, which
1005          * isn't necessarily the first in the SDP but has to be the first
1006          * to be set up, else the second/third SETUP will fail with a 461.
1007          */
1008         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1009              rt->server_type == RTSP_SERVER_WMS) {
1010             if (i == 0) {
1011                 /* rtx first */
1012                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1013                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
1014                     if (len >= 4 &&
1015                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1016                                 "/rtx"))
1017                         break;
1018                 }
1019                 if (rtx == rt->nb_rtsp_streams)
1020                     return -1; /* no RTX found */
1021                 rtsp_st = rt->rtsp_streams[rtx];
1022             } else
1023                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1024         } else
1025             rtsp_st = rt->rtsp_streams[i];
1026
1027         /* RTP/UDP */
1028         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1029             char buf[256];
1030
1031             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1032                 port = reply->transports[0].client_port_min;
1033                 goto have_port;
1034             }
1035
1036             /* first try in specified port range */
1037             if (RTSP_RTP_PORT_MIN != 0) {
1038                 while (j <= RTSP_RTP_PORT_MAX) {
1039                     ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1040                                 "?localport=%d", j);
1041                     /* we will use two ports per rtp stream (rtp and rtcp) */
1042                     j += 2;
1043                     if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1044                         goto rtp_opened;
1045                 }
1046             }
1047
1048 #if 0
1049             /* then try on any port */
1050             if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1051                 err = AVERROR_INVALIDDATA;
1052                 goto fail;
1053             }
1054 #endif
1055
1056         rtp_opened:
1057             port = rtp_get_local_port(rtsp_st->rtp_handle);
1058         have_port:
1059             snprintf(transport, sizeof(transport) - 1,
1060                      "%s/UDP;", trans_pref);
1061             if (rt->server_type != RTSP_SERVER_REAL)
1062                 av_strlcat(transport, "unicast;", sizeof(transport));
1063             av_strlcatf(transport, sizeof(transport),
1064                      "client_port=%d", port);
1065             if (rt->transport == RTSP_TRANSPORT_RTP &&
1066                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1067                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1068         }
1069
1070         /* RTP/TCP */
1071         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1072             /** For WMS streams, the application streams are only used for
1073              * UDP. When trying to set it up for TCP streams, the server
1074              * will return an error. Therefore, we skip those streams. */
1075             if (rt->server_type == RTSP_SERVER_WMS &&
1076                 s->streams[rtsp_st->stream_index]->codec->codec_type ==
1077                     AVMEDIA_TYPE_DATA)
1078                 continue;
1079             snprintf(transport, sizeof(transport) - 1,
1080                      "%s/TCP;", trans_pref);
1081             if (rt->server_type == RTSP_SERVER_WMS)
1082                 av_strlcat(transport, "unicast;", sizeof(transport));
1083             av_strlcatf(transport, sizeof(transport),
1084                         "interleaved=%d-%d",
1085                         interleave, interleave + 1);
1086             interleave += 2;
1087         }
1088
1089         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1090             snprintf(transport, sizeof(transport) - 1,
1091                      "%s/UDP;multicast", trans_pref);
1092         }
1093         if (s->oformat) {
1094             av_strlcat(transport, ";mode=receive", sizeof(transport));
1095         } else if (rt->server_type == RTSP_SERVER_REAL ||
1096                    rt->server_type == RTSP_SERVER_WMS)
1097             av_strlcat(transport, ";mode=play", sizeof(transport));
1098         snprintf(cmd, sizeof(cmd),
1099                  "Transport: %s\r\n",
1100                  transport);
1101         if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1102             char real_res[41], real_csum[9];
1103             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1104                                               real_challenge);
1105             av_strlcatf(cmd, sizeof(cmd),
1106                         "If-Match: %s\r\n"
1107                         "RealChallenge2: %s, sd=%s\r\n",
1108                         rt->session_id, real_res, real_csum);
1109         }
1110         ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1111         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1112             err = 1;
1113             goto fail;
1114         } else if (reply->status_code != RTSP_STATUS_OK ||
1115                    reply->nb_transports != 1) {
1116             err = AVERROR_INVALIDDATA;
1117             goto fail;
1118         }
1119
1120         /* XXX: same protocol for all streams is required */
1121         if (i > 0) {
1122             if (reply->transports[0].lower_transport != rt->lower_transport ||
1123                 reply->transports[0].transport != rt->transport) {
1124                 err = AVERROR_INVALIDDATA;
1125                 goto fail;
1126             }
1127         } else {
1128             rt->lower_transport = reply->transports[0].lower_transport;
1129             rt->transport = reply->transports[0].transport;
1130         }
1131
1132         /* close RTP connection if not chosen */
1133         if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1134             (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1135             url_close(rtsp_st->rtp_handle);
1136             rtsp_st->rtp_handle = NULL;
1137         }
1138
1139         switch(reply->transports[0].lower_transport) {
1140         case RTSP_LOWER_TRANSPORT_TCP:
1141             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1142             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1143             break;
1144
1145         case RTSP_LOWER_TRANSPORT_UDP: {
1146             char url[1024];
1147
1148             /* XXX: also use address if specified */
1149             ff_url_join(url, sizeof(url), "rtp", NULL, host,
1150                         reply->transports[0].server_port_min, NULL);
1151             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1152                 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1153                 err = AVERROR_INVALIDDATA;
1154                 goto fail;
1155             }
1156             /* Try to initialize the connection state in a
1157              * potential NAT router by sending dummy packets.
1158              * RTP/RTCP dummy packets are used for RDT, too.
1159              */
1160             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1161                 rtp_send_punch_packets(rtsp_st->rtp_handle);
1162             break;
1163         }
1164         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1165             char url[1024];
1166             struct in_addr in;
1167             int port, ttl;
1168
1169             if (reply->transports[0].destination) {
1170                 in.s_addr = htonl(reply->transports[0].destination);
1171                 port      = reply->transports[0].port_min;
1172                 ttl       = reply->transports[0].ttl;
1173             } else {
1174                 in        = rtsp_st->sdp_ip;
1175                 port      = rtsp_st->sdp_port;
1176                 ttl       = rtsp_st->sdp_ttl;
1177             }
1178             ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1179                         port, "?ttl=%d", ttl);
1180             if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1181                 err = AVERROR_INVALIDDATA;
1182                 goto fail;
1183             }
1184             break;
1185         }
1186         }
1187
1188         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1189             goto fail;
1190     }
1191
1192     if (reply->timeout > 0)
1193         rt->timeout = reply->timeout;
1194
1195     if (rt->server_type == RTSP_SERVER_REAL)
1196         rt->need_subscription = 1;
1197
1198     return 0;
1199
1200 fail:
1201     for (i = 0; i < rt->nb_rtsp_streams; i++) {
1202         if (rt->rtsp_streams[i]->rtp_handle) {
1203             url_close(rt->rtsp_streams[i]->rtp_handle);
1204             rt->rtsp_streams[i]->rtp_handle = NULL;
1205         }
1206     }
1207     return err;
1208 }
1209
1210 static int rtsp_read_play(AVFormatContext *s)
1211 {
1212     RTSPState *rt = s->priv_data;
1213     RTSPMessageHeader reply1, *reply = &reply1;
1214     int i;
1215     char cmd[1024];
1216
1217     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1218
1219     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1220         if (rt->state == RTSP_STATE_PAUSED) {
1221             cmd[0] = 0;
1222         } else {
1223             snprintf(cmd, sizeof(cmd),
1224                      "Range: npt=%0.3f-\r\n",
1225                      (double)rt->seek_timestamp / AV_TIME_BASE);
1226         }
1227         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
1228         if (reply->status_code != RTSP_STATUS_OK) {
1229             return -1;
1230         }
1231         if (reply->range_start != AV_NOPTS_VALUE &&
1232             rt->transport == RTSP_TRANSPORT_RTP) {
1233             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1234                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
1235                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1236                 AVStream *st = NULL;
1237                 if (!rtpctx)
1238                     continue;
1239                 if (rtsp_st->stream_index >= 0)
1240                     st = s->streams[rtsp_st->stream_index];
1241                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
1242                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
1243                 if (st)
1244                     rtpctx->range_start_offset = av_rescale_q(reply->range_start,
1245                                                               AV_TIME_BASE_Q,
1246                                                               st->time_base);
1247             }
1248         }
1249     }
1250     rt->state = RTSP_STATE_STREAMING;
1251     return 0;
1252 }
1253
1254 static int rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
1255 {
1256     RTSPState *rt = s->priv_data;
1257     char cmd[1024];
1258     unsigned char *content = NULL;
1259     int ret;
1260
1261     /* describe the stream */
1262     snprintf(cmd, sizeof(cmd),
1263              "Accept: application/sdp\r\n");
1264     if (rt->server_type == RTSP_SERVER_REAL) {
1265         /**
1266          * The Require: attribute is needed for proper streaming from
1267          * Realmedia servers.
1268          */
1269         av_strlcat(cmd,
1270                    "Require: com.real.retain-entity-for-setup\r\n",
1271                    sizeof(cmd));
1272     }
1273     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
1274     if (!content)
1275         return AVERROR_INVALIDDATA;
1276     if (reply->status_code != RTSP_STATUS_OK) {
1277         av_freep(&content);
1278         return AVERROR_INVALIDDATA;
1279     }
1280
1281     /* now we got the SDP description, we parse it */
1282     ret = sdp_parse(s, (const char *)content);
1283     av_freep(&content);
1284     if (ret < 0)
1285         return AVERROR_INVALIDDATA;
1286
1287     return 0;
1288 }
1289
1290 static int rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
1291 {
1292     RTSPState *rt = s->priv_data;
1293     RTSPMessageHeader reply1, *reply = &reply1;
1294     int i;
1295     char *sdp;
1296     AVFormatContext sdp_ctx, *ctx_array[1];
1297
1298     rt->start_time = av_gettime();
1299
1300     /* Announce the stream */
1301     sdp = av_mallocz(SDP_MAX_SIZE);
1302     if (sdp == NULL)
1303         return AVERROR(ENOMEM);
1304     /* We create the SDP based on the RTSP AVFormatContext where we
1305      * aren't allowed to change the filename field. (We create the SDP
1306      * based on the RTSP context since the contexts for the RTP streams
1307      * don't exist yet.) In order to specify a custom URL with the actual
1308      * peer IP instead of the originally specified hostname, we create
1309      * a temporary copy of the AVFormatContext, where the custom URL is set.
1310      *
1311      * FIXME: Create the SDP without copying the AVFormatContext.
1312      * This either requires setting up the RTP stream AVFormatContexts
1313      * already here (complicating things immensely) or getting a more
1314      * flexible SDP creation interface.
1315      */
1316     sdp_ctx = *s;
1317     ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
1318                 "rtsp", NULL, addr, -1, NULL);
1319     ctx_array[0] = &sdp_ctx;
1320     if (avf_sdp_create(ctx_array, 1, sdp, SDP_MAX_SIZE)) {
1321         av_free(sdp);
1322         return AVERROR_INVALIDDATA;
1323     }
1324     av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1325     ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
1326                                   "Content-Type: application/sdp\r\n",
1327                                   reply, NULL, sdp, strlen(sdp));
1328     av_free(sdp);
1329     if (reply->status_code != RTSP_STATUS_OK)
1330         return AVERROR_INVALIDDATA;
1331
1332     /* Set up the RTSPStreams for each AVStream */
1333     for (i = 0; i < s->nb_streams; i++) {
1334         RTSPStream *rtsp_st;
1335         AVStream *st = s->streams[i];
1336
1337         rtsp_st = av_mallocz(sizeof(RTSPStream));
1338         if (!rtsp_st)
1339             return AVERROR(ENOMEM);
1340         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1341
1342         st->priv_data = rtsp_st;
1343         rtsp_st->stream_index = i;
1344
1345         av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
1346         /* Note, this must match the relative uri set in the sdp content */
1347         av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1348                     "/streamid=%d", i);
1349     }
1350
1351     return 0;
1352 }
1353
1354 void ff_rtsp_close_connections(AVFormatContext *s)
1355 {
1356     RTSPState *rt = s->priv_data;
1357     if (rt->rtsp_hd_out != rt->rtsp_hd) url_close(rt->rtsp_hd_out);
1358     url_close(rt->rtsp_hd);
1359     rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1360 }
1361
1362 int ff_rtsp_connect(AVFormatContext *s)
1363 {
1364     RTSPState *rt = s->priv_data;
1365     char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1366     char *option_list, *option, *filename;
1367     int port, err, tcp_fd;
1368     RTSPMessageHeader reply1 = {0}, *reply = &reply1;
1369     int lower_transport_mask = 0;
1370     char real_challenge[64];
1371     struct sockaddr_storage peer;
1372     socklen_t peer_len = sizeof(peer);
1373
1374     if (!ff_network_init())
1375         return AVERROR(EIO);
1376 redirect:
1377     rt->control_transport = RTSP_MODE_PLAIN;
1378     /* extract hostname and port */
1379     av_url_split(NULL, 0, auth, sizeof(auth),
1380                  host, sizeof(host), &port, path, sizeof(path), s->filename);
1381     if (*auth) {
1382         av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1383     }
1384     if (port < 0)
1385         port = RTSP_DEFAULT_PORT;
1386
1387     /* search for options */
1388     option_list = strrchr(path, '?');
1389     if (option_list) {
1390         /* Strip out the RTSP specific options, write out the rest of
1391          * the options back into the same string. */
1392         filename = option_list;
1393         while (option_list) {
1394             /* move the option pointer */
1395             option = ++option_list;
1396             option_list = strchr(option_list, '&');
1397             if (option_list)
1398                 *option_list = 0;
1399
1400             /* handle the options */
1401             if (!strcmp(option, "udp")) {
1402                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1403             } else if (!strcmp(option, "multicast")) {
1404                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1405             } else if (!strcmp(option, "tcp")) {
1406                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1407             } else if(!strcmp(option, "http")) {
1408                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1409                 rt->control_transport = RTSP_MODE_TUNNEL;
1410             } else {
1411                 /* Write options back into the buffer, using memmove instead
1412                  * of strcpy since the strings may overlap. */
1413                 int len = strlen(option);
1414                 memmove(++filename, option, len);
1415                 filename += len;
1416                 if (option_list) *filename = '&';
1417             }
1418         }
1419         *filename = 0;
1420     }
1421
1422     if (!lower_transport_mask)
1423         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1424
1425     if (s->oformat) {
1426         /* Only UDP or TCP - UDP multicast isn't supported. */
1427         lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1428                                 (1 << RTSP_LOWER_TRANSPORT_TCP);
1429         if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1430             av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1431                                     "only UDP and TCP are supported for output.\n");
1432             err = AVERROR(EINVAL);
1433             goto fail;
1434         }
1435     }
1436
1437     /* Construct the URI used in request; this is similar to s->filename,
1438      * but with authentication credentials removed and RTSP specific options
1439      * stripped out. */
1440     ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1441                 host, port, "%s", path);
1442
1443     if (rt->control_transport == RTSP_MODE_TUNNEL) {
1444         /* set up initial handshake for tunneling */
1445         char httpname[1024];
1446         char sessioncookie[17];
1447         char headers[1024];
1448
1449         ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1450         snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1451                  av_get_random_seed(), av_get_random_seed());
1452
1453         /* GET requests */
1454         if (url_alloc(&rt->rtsp_hd, httpname, URL_RDONLY) < 0) {
1455             err = AVERROR(EIO);
1456             goto fail;
1457         }
1458
1459         /* generate GET headers */
1460         snprintf(headers, sizeof(headers),
1461                  "x-sessioncookie: %s\r\n"
1462                  "Accept: application/x-rtsp-tunnelled\r\n"
1463                  "Pragma: no-cache\r\n"
1464                  "Cache-Control: no-cache\r\n",
1465                  sessioncookie);
1466         ff_http_set_headers(rt->rtsp_hd, headers);
1467
1468         /* complete the connection */
1469         if (url_connect(rt->rtsp_hd)) {
1470             err = AVERROR(EIO);
1471             goto fail;
1472         }
1473
1474         /* POST requests */
1475         if (url_alloc(&rt->rtsp_hd_out, httpname, URL_WRONLY) < 0 ) {
1476             err = AVERROR(EIO);
1477             goto fail;
1478         }
1479
1480         /* generate POST headers */
1481         snprintf(headers, sizeof(headers),
1482                  "x-sessioncookie: %s\r\n"
1483                  "Content-Type: application/x-rtsp-tunnelled\r\n"
1484                  "Pragma: no-cache\r\n"
1485                  "Cache-Control: no-cache\r\n"
1486                  "Content-Length: 32767\r\n"
1487                  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1488                  sessioncookie);
1489         ff_http_set_headers(rt->rtsp_hd_out, headers);
1490         ff_http_set_chunked_transfer_encoding(rt->rtsp_hd_out, 0);
1491
1492         /* Initialize the authentication state for the POST session. The HTTP
1493          * protocol implementation doesn't properly handle multi-pass
1494          * authentication for POST requests, since it would require one of
1495          * the following:
1496          * - implementing Expect: 100-continue, which many HTTP servers
1497          *   don't support anyway, even less the RTSP servers that do HTTP
1498          *   tunneling
1499          * - sending the whole POST data until getting a 401 reply specifying
1500          *   what authentication method to use, then resending all that data
1501          * - waiting for potential 401 replies directly after sending the
1502          *   POST header (waiting for some unspecified time)
1503          * Therefore, we copy the full auth state, which works for both basic
1504          * and digest. (For digest, we would have to synchronize the nonce
1505          * count variable between the two sessions, if we'd do more requests
1506          * with the original session, though.)
1507          */
1508         ff_http_init_auth_state(rt->rtsp_hd_out, rt->rtsp_hd);
1509
1510         /* complete the connection */
1511         if (url_connect(rt->rtsp_hd_out)) {
1512             err = AVERROR(EIO);
1513             goto fail;
1514         }
1515     } else {
1516         /* open the tcp connection */
1517         ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1518         if (url_open(&rt->rtsp_hd, tcpname, URL_RDWR) < 0) {
1519             err = AVERROR(EIO);
1520             goto fail;
1521         }
1522         rt->rtsp_hd_out = rt->rtsp_hd;
1523     }
1524     rt->seq = 0;
1525
1526     tcp_fd = url_get_file_handle(rt->rtsp_hd);
1527     if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1528         getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1529                     NULL, 0, NI_NUMERICHOST);
1530     }
1531
1532     /* request options supported by the server; this also detects server
1533      * type */
1534     for (rt->server_type = RTSP_SERVER_RTP;;) {
1535         cmd[0] = 0;
1536         if (rt->server_type == RTSP_SERVER_REAL)
1537             av_strlcat(cmd,
1538                        /**
1539                         * The following entries are required for proper
1540                         * streaming from a Realmedia server. They are
1541                         * interdependent in some way although we currently
1542                         * don't quite understand how. Values were copied
1543                         * from mplayer SVN r23589.
1544                         * @param CompanyID is a 16-byte ID in base64
1545                         * @param ClientChallenge is a 16-byte ID in hex
1546                         */
1547                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1548                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1549                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1550                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1551                        sizeof(cmd));
1552         ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1553         if (reply->status_code != RTSP_STATUS_OK) {
1554             err = AVERROR_INVALIDDATA;
1555             goto fail;
1556         }
1557
1558         /* detect server type if not standard-compliant RTP */
1559         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1560             rt->server_type = RTSP_SERVER_REAL;
1561             continue;
1562         } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1563             rt->server_type = RTSP_SERVER_WMS;
1564         } else if (rt->server_type == RTSP_SERVER_REAL)
1565             strcpy(real_challenge, reply->real_challenge);
1566         break;
1567     }
1568
1569     if (s->iformat)
1570         err = rtsp_setup_input_streams(s, reply);
1571     else
1572         err = rtsp_setup_output_streams(s, host);
1573     if (err)
1574         goto fail;
1575
1576     do {
1577         int lower_transport = ff_log2_tab[lower_transport_mask &
1578                                   ~(lower_transport_mask - 1)];
1579
1580         err = make_setup_request(s, host, port, lower_transport,
1581                                  rt->server_type == RTSP_SERVER_REAL ?
1582                                      real_challenge : NULL);
1583         if (err < 0)
1584             goto fail;
1585         lower_transport_mask &= ~(1 << lower_transport);
1586         if (lower_transport_mask == 0 && err == 1) {
1587             err = FF_NETERROR(EPROTONOSUPPORT);
1588             goto fail;
1589         }
1590     } while (err);
1591
1592     rt->state = RTSP_STATE_IDLE;
1593     rt->seek_timestamp = 0; /* default is to start stream at position zero */
1594     return 0;
1595  fail:
1596     ff_rtsp_close_streams(s);
1597     ff_rtsp_close_connections(s);
1598     if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1599         av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1600         av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1601                reply->status_code,
1602                s->filename);
1603         goto redirect;
1604     }
1605     ff_network_close();
1606     return err;
1607 }
1608 #endif
1609
1610 #if CONFIG_RTSP_DEMUXER
1611 static int rtsp_read_header(AVFormatContext *s,
1612                             AVFormatParameters *ap)
1613 {
1614     RTSPState *rt = s->priv_data;
1615     int ret;
1616
1617     ret = ff_rtsp_connect(s);
1618     if (ret)
1619         return ret;
1620
1621     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
1622     if (!rt->real_setup_cache)
1623         return AVERROR(ENOMEM);
1624     rt->real_setup = rt->real_setup_cache + s->nb_streams * sizeof(*rt->real_setup);
1625
1626     if (ap->initial_pause) {
1627          /* do not start immediately */
1628     } else {
1629          if (rtsp_read_play(s) < 0) {
1630             ff_rtsp_close_streams(s);
1631             ff_rtsp_close_connections(s);
1632             return AVERROR_INVALIDDATA;
1633         }
1634     }
1635
1636     return 0;
1637 }
1638
1639 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1640                            uint8_t *buf, int buf_size)
1641 {
1642     RTSPState *rt = s->priv_data;
1643     RTSPStream *rtsp_st;
1644     fd_set rfds;
1645     int fd, fd_max, n, i, ret, tcp_fd, timeout_cnt = 0;
1646     struct timeval tv;
1647
1648     for (;;) {
1649         if (url_interrupt_cb())
1650             return AVERROR(EINTR);
1651         FD_ZERO(&rfds);
1652         if (rt->rtsp_hd) {
1653             tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1654             FD_SET(tcp_fd, &rfds);
1655         } else {
1656             fd_max = 0;
1657             tcp_fd = -1;
1658         }
1659         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1660             rtsp_st = rt->rtsp_streams[i];
1661             if (rtsp_st->rtp_handle) {
1662                 /* currently, we cannot probe RTCP handle because of
1663                  * blocking restrictions */
1664                 fd = url_get_file_handle(rtsp_st->rtp_handle);
1665                 if (fd > fd_max)
1666                     fd_max = fd;
1667                 FD_SET(fd, &rfds);
1668             }
1669         }
1670         tv.tv_sec = 0;
1671         tv.tv_usec = SELECT_TIMEOUT_MS * 1000;
1672         n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1673         if (n > 0) {
1674             timeout_cnt = 0;
1675             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1676                 rtsp_st = rt->rtsp_streams[i];
1677                 if (rtsp_st->rtp_handle) {
1678                     fd = url_get_file_handle(rtsp_st->rtp_handle);
1679                     if (FD_ISSET(fd, &rfds)) {
1680                         ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1681                         if (ret > 0) {
1682                             *prtsp_st = rtsp_st;
1683                             return ret;
1684                         }
1685                     }
1686                 }
1687             }
1688 #if CONFIG_RTSP_DEMUXER
1689             if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1690                 RTSPMessageHeader reply;
1691
1692                 ret = ff_rtsp_read_reply(s, &reply, NULL, 0);
1693                 if (ret < 0)
1694                     return ret;
1695                 /* XXX: parse message */
1696                 if (rt->state != RTSP_STATE_STREAMING)
1697                     return 0;
1698             }
1699 #endif
1700         } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1701             return FF_NETERROR(ETIMEDOUT);
1702         } else if (n < 0 && errno != EINTR)
1703             return AVERROR(errno);
1704     }
1705 }
1706
1707 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1708                            uint8_t *buf, int buf_size)
1709 {
1710     RTSPState *rt = s->priv_data;
1711     int id, len, i, ret;
1712     RTSPStream *rtsp_st;
1713
1714 #ifdef DEBUG_RTP_TCP
1715     dprintf(s, "tcp_read_packet:\n");
1716 #endif
1717 redo:
1718     for (;;) {
1719         RTSPMessageHeader reply;
1720
1721         ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1722         if (ret < 0)
1723             return ret;
1724         if (ret == 1) /* received '$' */
1725             break;
1726         /* XXX: parse message */
1727         if (rt->state != RTSP_STATE_STREAMING)
1728             return 0;
1729     }
1730     ret = url_read_complete(rt->rtsp_hd, buf, 3);
1731     if (ret != 3)
1732         return -1;
1733     id  = buf[0];
1734     len = AV_RB16(buf + 1);
1735 #ifdef DEBUG_RTP_TCP
1736     dprintf(s, "id=%d len=%d\n", id, len);
1737 #endif
1738     if (len > buf_size || len < 12)
1739         goto redo;
1740     /* get the data */
1741     ret = url_read_complete(rt->rtsp_hd, buf, len);
1742     if (ret != len)
1743         return -1;
1744     if (rt->transport == RTSP_TRANSPORT_RDT &&
1745         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1746         return -1;
1747
1748     /* find the matching stream */
1749     for (i = 0; i < rt->nb_rtsp_streams; i++) {
1750         rtsp_st = rt->rtsp_streams[i];
1751         if (id >= rtsp_st->interleaved_min &&
1752             id <= rtsp_st->interleaved_max)
1753             goto found;
1754     }
1755     goto redo;
1756 found:
1757     *prtsp_st = rtsp_st;
1758     return len;
1759 }
1760
1761 static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1762 {
1763     RTSPState *rt = s->priv_data;
1764     int ret, len;
1765     uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1766     RTSPStream *rtsp_st;
1767
1768     /* get next frames from the same RTP packet */
1769     if (rt->cur_transport_priv) {
1770         if (rt->transport == RTSP_TRANSPORT_RDT) {
1771             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1772         } else
1773             ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1774         if (ret == 0) {
1775             rt->cur_transport_priv = NULL;
1776             return 0;
1777         } else if (ret == 1) {
1778             return 0;
1779         } else
1780             rt->cur_transport_priv = NULL;
1781     }
1782
1783     /* read next RTP packet */
1784  redo:
1785     switch(rt->lower_transport) {
1786     default:
1787 #if CONFIG_RTSP_DEMUXER
1788     case RTSP_LOWER_TRANSPORT_TCP:
1789         len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1790         break;
1791 #endif
1792     case RTSP_LOWER_TRANSPORT_UDP:
1793     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1794         len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1795         if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1796             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1797         break;
1798     }
1799     if (len < 0)
1800         return len;
1801     if (len == 0)
1802         return AVERROR_EOF;
1803     if (rt->transport == RTSP_TRANSPORT_RDT) {
1804         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1805     } else {
1806         ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1807         if (ret < 0) {
1808             /* Either bad packet, or a RTCP packet. Check if the
1809              * first_rtcp_ntp_time field was initialized. */
1810             RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1811             if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
1812                 /* first_rtcp_ntp_time has been initialized for this stream,
1813                  * copy the same value to all other uninitialized streams,
1814                  * in order to map their timestamp origin to the same ntp time
1815                  * as this one. */
1816                 int i;
1817                 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1818                     RTPDemuxContext *rtpctx2 = rtsp_st->transport_priv;
1819                     if (rtpctx2 &&
1820                         rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE)
1821                         rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
1822                 }
1823             }
1824         }
1825     }
1826     if (ret < 0)
1827         goto redo;
1828     if (ret == 1)
1829         /* more packets may follow, so we save the RTP context */
1830         rt->cur_transport_priv = rtsp_st->transport_priv;
1831
1832     return ret;
1833 }
1834
1835 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1836 {
1837     RTSPState *rt = s->priv_data;
1838     int ret;
1839     RTSPMessageHeader reply1, *reply = &reply1;
1840     char cmd[1024];
1841
1842     if (rt->server_type == RTSP_SERVER_REAL) {
1843         int i;
1844
1845         for (i = 0; i < s->nb_streams; i++)
1846             rt->real_setup[i] = s->streams[i]->discard;
1847
1848         if (!rt->need_subscription) {
1849             if (memcmp (rt->real_setup, rt->real_setup_cache,
1850                         sizeof(enum AVDiscard) * s->nb_streams)) {
1851                 snprintf(cmd, sizeof(cmd),
1852                          "Unsubscribe: %s\r\n",
1853                          rt->last_subscription);
1854                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1855                                  cmd, reply, NULL);
1856                 if (reply->status_code != RTSP_STATUS_OK)
1857                     return AVERROR_INVALIDDATA;
1858                 rt->need_subscription = 1;
1859             }
1860         }
1861
1862         if (rt->need_subscription) {
1863             int r, rule_nr, first = 1;
1864
1865             memcpy(rt->real_setup_cache, rt->real_setup,
1866                    sizeof(enum AVDiscard) * s->nb_streams);
1867             rt->last_subscription[0] = 0;
1868
1869             snprintf(cmd, sizeof(cmd),
1870                      "Subscribe: ");
1871             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1872                 rule_nr = 0;
1873                 for (r = 0; r < s->nb_streams; r++) {
1874                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1875                         if (s->streams[r]->discard != AVDISCARD_ALL) {
1876                             if (!first)
1877                                 av_strlcat(rt->last_subscription, ",",
1878                                            sizeof(rt->last_subscription));
1879                             ff_rdt_subscribe_rule(
1880                                 rt->last_subscription,
1881                                 sizeof(rt->last_subscription), i, rule_nr);
1882                             first = 0;
1883                         }
1884                         rule_nr++;
1885                     }
1886                 }
1887             }
1888             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1889             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1890                              cmd, reply, NULL);
1891             if (reply->status_code != RTSP_STATUS_OK)
1892                 return AVERROR_INVALIDDATA;
1893             rt->need_subscription = 0;
1894
1895             if (rt->state == RTSP_STATE_STREAMING)
1896                 rtsp_read_play (s);
1897         }
1898     }
1899
1900     ret = rtsp_fetch_packet(s, pkt);
1901     if (ret < 0)
1902         return ret;
1903
1904     /* send dummy request to keep TCP connection alive */
1905     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1906         if (rt->server_type == RTSP_SERVER_WMS) {
1907             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
1908         } else {
1909             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
1910         }
1911     }
1912
1913     return 0;
1914 }
1915
1916 /* pause the stream */
1917 static int rtsp_read_pause(AVFormatContext *s)
1918 {
1919     RTSPState *rt = s->priv_data;
1920     RTSPMessageHeader reply1, *reply = &reply1;
1921
1922     if (rt->state != RTSP_STATE_STREAMING)
1923         return 0;
1924     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1925         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
1926         if (reply->status_code != RTSP_STATUS_OK) {
1927             return -1;
1928         }
1929     }
1930     rt->state = RTSP_STATE_PAUSED;
1931     return 0;
1932 }
1933
1934 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1935                           int64_t timestamp, int flags)
1936 {
1937     RTSPState *rt = s->priv_data;
1938
1939     rt->seek_timestamp = av_rescale_q(timestamp,
1940                                       s->streams[stream_index]->time_base,
1941                                       AV_TIME_BASE_Q);
1942     switch(rt->state) {
1943     default:
1944     case RTSP_STATE_IDLE:
1945         break;
1946     case RTSP_STATE_STREAMING:
1947         if (rtsp_read_pause(s) != 0)
1948             return -1;
1949         rt->state = RTSP_STATE_SEEKING;
1950         if (rtsp_read_play(s) != 0)
1951             return -1;
1952         break;
1953     case RTSP_STATE_PAUSED:
1954         rt->state = RTSP_STATE_IDLE;
1955         break;
1956     }
1957     return 0;
1958 }
1959
1960 static int rtsp_read_close(AVFormatContext *s)
1961 {
1962     RTSPState *rt = s->priv_data;
1963
1964 #if 0
1965     /* NOTE: it is valid to flush the buffer here */
1966     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1967         url_fclose(&rt->rtsp_gb);
1968     }
1969 #endif
1970     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
1971
1972     ff_rtsp_close_streams(s);
1973     ff_rtsp_close_connections(s);
1974     ff_network_close();
1975     rt->real_setup = NULL;
1976     av_freep(&rt->real_setup_cache);
1977     return 0;
1978 }
1979
1980 AVInputFormat rtsp_demuxer = {
1981     "rtsp",
1982     NULL_IF_CONFIG_SMALL("RTSP input format"),
1983     sizeof(RTSPState),
1984     rtsp_probe,
1985     rtsp_read_header,
1986     rtsp_read_packet,
1987     rtsp_read_close,
1988     rtsp_read_seek,
1989     .flags = AVFMT_NOFILE,
1990     .read_play = rtsp_read_play,
1991     .read_pause = rtsp_read_pause,
1992 };
1993 #endif
1994
1995 static int sdp_probe(AVProbeData *p1)
1996 {
1997     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1998
1999     /* we look for a line beginning "c=IN IP4" */
2000     while (p < p_end && *p != '\0') {
2001         if (p + sizeof("c=IN IP4") - 1 < p_end &&
2002             av_strstart(p, "c=IN IP4", NULL))
2003             return AVPROBE_SCORE_MAX / 2;
2004
2005         while (p < p_end - 1 && *p != '\n') p++;
2006         if (++p >= p_end)
2007             break;
2008         if (*p == '\r')
2009             p++;
2010     }
2011     return 0;
2012 }
2013
2014 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
2015 {
2016     RTSPState *rt = s->priv_data;
2017     RTSPStream *rtsp_st;
2018     int size, i, err;
2019     char *content;
2020     char url[1024];
2021
2022     if (!ff_network_init())
2023         return AVERROR(EIO);
2024
2025     /* read the whole sdp file */
2026     /* XXX: better loading */
2027     content = av_malloc(SDP_MAX_SIZE);
2028     size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
2029     if (size <= 0) {
2030         av_free(content);
2031         return AVERROR_INVALIDDATA;
2032     }
2033     content[size] ='\0';
2034
2035     sdp_parse(s, content);
2036     av_free(content);
2037
2038     /* open each RTP stream */
2039     for (i = 0; i < rt->nb_rtsp_streams; i++) {
2040         rtsp_st = rt->rtsp_streams[i];
2041
2042         ff_url_join(url, sizeof(url), "rtp", NULL,
2043                     inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
2044                     "?localport=%d&ttl=%d", rtsp_st->sdp_port,
2045                     rtsp_st->sdp_ttl);
2046         if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
2047             err = AVERROR_INVALIDDATA;
2048             goto fail;
2049         }
2050         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
2051             goto fail;
2052     }
2053     return 0;
2054 fail:
2055     ff_rtsp_close_streams(s);
2056     ff_network_close();
2057     return err;
2058 }
2059
2060 static int sdp_read_close(AVFormatContext *s)
2061 {
2062     ff_rtsp_close_streams(s);
2063     ff_network_close();
2064     return 0;
2065 }
2066
2067 AVInputFormat sdp_demuxer = {
2068     "sdp",
2069     NULL_IF_CONFIG_SMALL("SDP"),
2070     sizeof(RTSPState),
2071     sdp_probe,
2072     sdp_read_header,
2073     rtsp_fetch_packet,
2074     sdp_read_close,
2075 };