libavformat/rtsp.c

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