libavformat/rtsp.c

   1 /*
   2  * RTSP/SDP client
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/mathematics.h"
  26 #include "libavutil/parseutils.h"
  27 #include "libavutil/random_seed.h"
  28 #include "libavutil/dict.h"
  29 #include "libavutil/opt.h"
  30 #include "avformat.h"
  31 #include "avio_internal.h"
  32
  33 #include <sys/time.h>
  34 #if HAVE_POLL_H
  35 #include <poll.h>
  36 #endif
  37 #include "internal.h"
  38 #include "network.h"
  39 #include "os_support.h"
  40 #include "http.h"
  41 #include "rtsp.h"
  42
  43 #include "rtpdec.h"
  44 #include "rdt.h"
  45 #include "rtpdec_formats.h"
  46 #include "rtpenc_chain.h"
  47 #include "url.h"
  48 #include "rtpenc.h"
  49
  50 //#define DEBUG
  51
  52 /* Timeout values for socket poll, in ms,
  53  * and read_packet(), in seconds  */
  54 #define POLL_TIMEOUT_MS 100
  55 #define READ_PACKET_TIMEOUT_S 10
  56 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / POLL_TIMEOUT_MS
  57 #define SDP_MAX_SIZE 16384
  58 #define RECVBUF_SIZE 10 * RTP_MAX_PACKET_LENGTH
  59
  60 #define OFFSET(x) offsetof(RTSPState, x)
  61 #define DEC AV_OPT_FLAG_DECODING_PARAM
  62 #define ENC AV_OPT_FLAG_ENCODING_PARAM
  63
  64 #define RTSP_FLAG_OPTS(name, longname) \
  65     { name, longname, OFFSET(rtsp_flags), AV_OPT_TYPE_FLAGS, {0}, INT_MIN, INT_MAX, DEC, "rtsp_flags" }, \
  66     { "filter_src", "Only receive packets from the negotiated peer IP", 0, AV_OPT_TYPE_CONST, {RTSP_FLAG_FILTER_SRC}, 0, 0, DEC, "rtsp_flags" }
  67
  68 #define RTSP_MEDIATYPE_OPTS(name, longname) \
  69     { name, longname, OFFSET(media_type_mask), AV_OPT_TYPE_FLAGS, { (1 << (AVMEDIA_TYPE_DATA+1)) - 1 }, INT_MIN, INT_MAX, DEC, "allowed_media_types" }, \
  70     { "video", "Video", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_VIDEO}, 0, 0, DEC, "allowed_media_types" }, \
  71     { "audio", "Audio", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_AUDIO}, 0, 0, DEC, "allowed_media_types" }, \
  72     { "data", "Data", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_DATA}, 0, 0, DEC, "allowed_media_types" }
  73
  74 const AVOption ff_rtsp_options[] = {
  75     { "initial_pause",  "Don't start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_INT, {0}, 0, 1, DEC },
  76     FF_RTP_FLAG_OPTS(RTSPState, rtp_muxer_flags),
  77     { "rtsp_transport", "RTSP transport protocols", OFFSET(lower_transport_mask), AV_OPT_TYPE_FLAGS, {0}, INT_MIN, INT_MAX, DEC|ENC, "rtsp_transport" }, \
  78     { "udp", "UDP", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_UDP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
  79     { "tcp", "TCP", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_TCP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
  80     { "udp_multicast", "UDP multicast", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_UDP_MULTICAST}, 0, 0, DEC, "rtsp_transport" },
  81     { "http", "HTTP tunneling", 0, AV_OPT_TYPE_CONST, {(1 << RTSP_LOWER_TRANSPORT_HTTP)}, 0, 0, DEC, "rtsp_transport" },
  82     RTSP_FLAG_OPTS("rtsp_flags", "RTSP flags"),
  83     RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
  84     { NULL },
  85 };
  86
  87 static const AVOption sdp_options[] = {
  88     RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
  89     RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
  90     { NULL },
  91 };
  92
  93 static const AVOption rtp_options[] = {
  94     RTSP_FLAG_OPTS("rtp_flags", "RTP flags"),
  95     { NULL },
  96 };
  97
  98 static void get_word_until_chars(char *buf, int buf_size,
  99                                  const char *sep, const char **pp)
 100 {
 101     const char *p;
 102     char *q;
 103
 104     p = *pp;
 105     p += strspn(p, SPACE_CHARS);
 106     q = buf;
 107     while (!strchr(sep, *p) && *p != '\0') {
 108         if ((q - buf) < buf_size - 1)
 109             *q++ = *p;
 110         p++;
 111     }
 112     if (buf_size > 0)
 113         *q = '\0';
 114     *pp = p;
 115 }
 116
 117 static void get_word_sep(char *buf, int buf_size, const char *sep,
 118                          const char **pp)
 119 {
 120     if (**pp == '/') (*pp)++;
 121     get_word_until_chars(buf, buf_size, sep, pp);
 122 }
 123
 124 static void get_word(char *buf, int buf_size, const char **pp)
 125 {
 126     get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
 127 }
 128
 129 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
 130  *  and end time.
 131  *  Used for seeking in the rtp stream.
 132  */
 133 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
 134 {
 135     char buf[256];
 136
 137     p += strspn(p, SPACE_CHARS);
 138     if (!av_stristart(p, "npt=", &p))
 139         return;
 140
 141     *start = AV_NOPTS_VALUE;
 142     *end = AV_NOPTS_VALUE;
 143
 144     get_word_sep(buf, sizeof(buf), "-", &p);
 145     av_parse_time(start, buf, 1);
 146     if (*p == '-') {
 147         p++;
 148         get_word_sep(buf, sizeof(buf), "-", &p);
 149         av_parse_time(end, buf, 1);
 150     }
 151 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
 152 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
 153 }
 154
 155 static int get_sockaddr(const char *buf, struct sockaddr_storage *sock)
 156 {
 157     struct addrinfo hints, *ai = NULL;
 158     memset(&hints, 0, sizeof(hints));
 159     hints.ai_flags = AI_NUMERICHOST;
 160     if (getaddrinfo(buf, NULL, &hints, &ai))
 161         return -1;
 162     memcpy(sock, ai->ai_addr, FFMIN(sizeof(*sock), ai->ai_addrlen));
 163     freeaddrinfo(ai);
 164     return 0;
 165 }
 166
 167 #if CONFIG_RTPDEC
 168 static void init_rtp_handler(RTPDynamicProtocolHandler *handler,
 169                              RTSPStream *rtsp_st, AVCodecContext *codec)
 170 {
 171     if (!handler)
 172         return;
 173     codec->codec_id          = handler->codec_id;
 174     rtsp_st->dynamic_handler = handler;
 175     if (handler->alloc) {
 176         rtsp_st->dynamic_protocol_context = handler->alloc();
 177         if (!rtsp_st->dynamic_protocol_context)
 178             rtsp_st->dynamic_handler = NULL;
 179     }
 180 }
 181
 182 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
 183 static int sdp_parse_rtpmap(AVFormatContext *s,
 184                             AVStream *st, RTSPStream *rtsp_st,
 185                             int payload_type, const char *p)
 186 {
 187     AVCodecContext *codec = st->codec;
 188     char buf[256];
 189     int i;
 190     AVCodec *c;
 191     const char *c_name;
 192
 193     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
 194      * see if we can handle this kind of payload.
 195      * The space should normally not be there but some Real streams or
 196      * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
 197      * have a trailing space. */
 198     get_word_sep(buf, sizeof(buf), "/ ", &p);
 199     if (payload_type >= RTP_PT_PRIVATE) {
 200         RTPDynamicProtocolHandler *handler =
 201             ff_rtp_handler_find_by_name(buf, codec->codec_type);
 202         init_rtp_handler(handler, rtsp_st, codec);
 203         /* If no dynamic handler was found, check with the list of standard
 204          * allocated types, if such a stream for some reason happens to
 205          * use a private payload type. This isn't handled in rtpdec.c, since
 206          * the format name from the rtpmap line never is passed into rtpdec. */
 207         if (!rtsp_st->dynamic_handler)
 208             codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 209     } else {
 210         /* We are in a standard case
 211          * (from http://www.iana.org/assignments/rtp-parameters). */
 212         /* search into AVRtpPayloadTypes[] */
 213         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
 214     }
 215
 216     c = avcodec_find_decoder(codec->codec_id);
 217     if (c && c->name)
 218         c_name = c->name;
 219     else
 220         c_name = "(null)";
 221
 222     get_word_sep(buf, sizeof(buf), "/", &p);
 223     i = atoi(buf);
 224     switch (codec->codec_type) {
 225     case AVMEDIA_TYPE_AUDIO:
 226         av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
 227         codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
 228         codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
 229         if (i > 0) {
 230             codec->sample_rate = i;
 231             av_set_pts_info(st, 32, 1, codec->sample_rate);
 232             get_word_sep(buf, sizeof(buf), "/", &p);
 233             i = atoi(buf);
 234             if (i > 0)
 235                 codec->channels = i;
 236             // TODO: there is a bug here; if it is a mono stream, and
 237             // less than 22000Hz, faad upconverts to stereo and twice
 238             // the frequency.  No problem, but the sample rate is being
 239             // set here by the sdp line. Patch on its way. (rdm)
 240         }
 241         av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
 242                codec->sample_rate);
 243         av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
 244                codec->channels);
 245         break;
 246     case AVMEDIA_TYPE_VIDEO:
 247         av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
 248         if (i > 0)
 249             av_set_pts_info(st, 32, 1, i);
 250         break;
 251     default:
 252         break;
 253     }
 254     return 0;
 255 }
 256
 257 /* parse the attribute line from the fmtp a line of an sdp response. This
 258  * is broken out as a function because it is used in rtp_h264.c, which is
 259  * forthcoming. */
 260 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
 261                                 char *value, int value_size)
 262 {
 263     *p += strspn(*p, SPACE_CHARS);
 264     if (**p) {
 265         get_word_sep(attr, attr_size, "=", p);
 266         if (**p == '=')
 267             (*p)++;
 268         get_word_sep(value, value_size, ";", p);
 269         if (**p == ';')
 270             (*p)++;
 271         return 1;
 272     }
 273     return 0;
 274 }
 275
 276 typedef struct SDPParseState {
 277     /* SDP only */
 278     struct sockaddr_storage default_ip;
 279     int            default_ttl;
 280     int            skip_media;  ///< set if an unknown m= line occurs
 281 } SDPParseState;
 282
 283 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
 284                            int letter, const char *buf)
 285 {
 286     RTSPState *rt = s->priv_data;
 287     char buf1[64], st_type[64];
 288     const char *p;
 289     enum AVMediaType codec_type;
 290     int payload_type, i;
 291     AVStream *st;
 292     RTSPStream *rtsp_st;
 293     struct sockaddr_storage sdp_ip;
 294     int ttl;
 295
 296     av_dlog(s, "sdp: %c='%s'\n", letter, buf);
 297
 298     p = buf;
 299     if (s1->skip_media && letter != 'm')
 300         return;
 301     switch (letter) {
 302     case 'c':
 303         get_word(buf1, sizeof(buf1), &p);
 304         if (strcmp(buf1, "IN") != 0)
 305             return;
 306         get_word(buf1, sizeof(buf1), &p);
 307         if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6"))
 308             return;
 309         get_word_sep(buf1, sizeof(buf1), "/", &p);
 310         if (get_sockaddr(buf1, &sdp_ip))
 311             return;
 312         ttl = 16;
 313         if (*p == '/') {
 314             p++;
 315             get_word_sep(buf1, sizeof(buf1), "/", &p);
 316             ttl = atoi(buf1);
 317         }
 318         if (s->nb_streams == 0) {
 319             s1->default_ip = sdp_ip;
 320             s1->default_ttl = ttl;
 321         } else {
 322             rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
 323             rtsp_st->sdp_ip = sdp_ip;
 324             rtsp_st->sdp_ttl = ttl;
 325         }
 326         break;
 327     case 's':
 328         av_dict_set(&s->metadata, "title", p, 0);
 329         break;
 330     case 'i':
 331         if (s->nb_streams == 0) {
 332             av_dict_set(&s->metadata, "comment", p, 0);
 333             break;
 334         }
 335         break;
 336     case 'm':
 337         /* new stream */
 338         s1->skip_media = 0;
 339         codec_type = AVMEDIA_TYPE_UNKNOWN;
 340         get_word(st_type, sizeof(st_type), &p);
 341         if (!strcmp(st_type, "audio")) {
 342             codec_type = AVMEDIA_TYPE_AUDIO;
 343         } else if (!strcmp(st_type, "video")) {
 344             codec_type = AVMEDIA_TYPE_VIDEO;
 345         } else if (!strcmp(st_type, "application")) {
 346             codec_type = AVMEDIA_TYPE_DATA;
 347         }
 348         if (codec_type == AVMEDIA_TYPE_UNKNOWN || !(rt->media_type_mask & (1 << codec_type))) {
 349             s1->skip_media = 1;
 350             return;
 351         }
 352         rtsp_st = av_mallocz(sizeof(RTSPStream));
 353         if (!rtsp_st)
 354             return;
 355         rtsp_st->stream_index = -1;
 356         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
 357
 358         rtsp_st->sdp_ip = s1->default_ip;
 359         rtsp_st->sdp_ttl = s1->default_ttl;
 360
 361         get_word(buf1, sizeof(buf1), &p); /* port */
 362         rtsp_st->sdp_port = atoi(buf1);
 363
 364         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
 365
 366         /* XXX: handle list of formats */
 367         get_word(buf1, sizeof(buf1), &p); /* format list */
 368         rtsp_st->sdp_payload_type = atoi(buf1);
 369
 370         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
 371             /* no corresponding stream */
 372         } else {
 373             st = avformat_new_stream(s, NULL);
 374             if (!st)
 375                 return;
 376             st->id = rt->nb_rtsp_streams - 1;
 377             rtsp_st->stream_index = st->index;
 378             st->codec->codec_type = codec_type;
 379             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
 380                 RTPDynamicProtocolHandler *handler;
 381                 /* if standard payload type, we can find the codec right now */
 382                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
 383                 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
 384                     st->codec->sample_rate > 0)
 385                     av_set_pts_info(st, 32, 1, st->codec->sample_rate);
 386                 /* Even static payload types may need a custom depacketizer */
 387                 handler = ff_rtp_handler_find_by_id(
 388                               rtsp_st->sdp_payload_type, st->codec->codec_type);
 389                 init_rtp_handler(handler, rtsp_st, st->codec);
 390             }
 391         }
 392         /* put a default control url */
 393         av_strlcpy(rtsp_st->control_url, rt->control_uri,
 394                    sizeof(rtsp_st->control_url));
 395         break;
 396     case 'a':
 397         if (av_strstart(p, "control:", &p)) {
 398             if (s->nb_streams == 0) {
 399                 if (!strncmp(p, "rtsp://", 7))
 400                     av_strlcpy(rt->control_uri, p,
 401                                sizeof(rt->control_uri));
 402             } else {
 403                 char proto[32];
 404                 /* get the control url */
 405                 rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
 406
 407                 /* XXX: may need to add full url resolution */
 408                 av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
 409                              NULL, NULL, 0, p);
 410                 if (proto[0] == '\0') {
 411                     /* relative control URL */
 412                     if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
 413                     av_strlcat(rtsp_st->control_url, "/",
 414                                sizeof(rtsp_st->control_url));
 415                     av_strlcat(rtsp_st->control_url, p,
 416                                sizeof(rtsp_st->control_url));
 417                 } else
 418                     av_strlcpy(rtsp_st->control_url, p,
 419                                sizeof(rtsp_st->control_url));
 420             }
 421         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
 422             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
 423             get_word(buf1, sizeof(buf1), &p);
 424             payload_type = atoi(buf1);
 425             st = s->streams[s->nb_streams - 1];
 426             rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
 427             sdp_parse_rtpmap(s, st, rtsp_st, payload_type, p);
 428         } else if (av_strstart(p, "fmtp:", &p) ||
 429                    av_strstart(p, "framesize:", &p)) {
 430             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
 431             // let dynamic protocol handlers have a stab at the line.
 432             get_word(buf1, sizeof(buf1), &p);
 433             payload_type = atoi(buf1);
 434             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 435                 rtsp_st = rt->rtsp_streams[i];
 436                 if (rtsp_st->sdp_payload_type == payload_type &&
 437                     rtsp_st->dynamic_handler &&
 438                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 439                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
 440                         rtsp_st->dynamic_protocol_context, buf);
 441             }
 442         } else if (av_strstart(p, "range:", &p)) {
 443             int64_t start, end;
 444
 445             // this is so that seeking on a streamed file can work.
 446             rtsp_parse_range_npt(p, &start, &end);
 447             s->start_time = start;
 448             /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
 449             s->duration   = (end == AV_NOPTS_VALUE) ?
 450                             AV_NOPTS_VALUE : end - start;
 451         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
 452             if (atoi(p) == 1)
 453                 rt->transport = RTSP_TRANSPORT_RDT;
 454         } else if (av_strstart(p, "SampleRate:integer;", &p) &&
 455                    s->nb_streams > 0) {
 456             st = s->streams[s->nb_streams - 1];
 457             st->codec->sample_rate = atoi(p);
 458         } else {
 459             if (rt->server_type == RTSP_SERVER_WMS)
 460                 ff_wms_parse_sdp_a_line(s, p);
 461             if (s->nb_streams > 0) {
 462                 if (rt->server_type == RTSP_SERVER_REAL)
 463                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
 464
 465                 rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
 466                 if (rtsp_st->dynamic_handler &&
 467                     rtsp_st->dynamic_handler->parse_sdp_a_line)
 468                     rtsp_st->dynamic_handler->parse_sdp_a_line(s,
 469                         s->nb_streams - 1,
 470                         rtsp_st->dynamic_protocol_context, buf);
 471             }
 472         }
 473         break;
 474     }
 475 }
 476
 477 int ff_sdp_parse(AVFormatContext *s, const char *content)
 478 {
 479     RTSPState *rt = s->priv_data;
 480     const char *p;
 481     int letter;
 482     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
 483      * contain long SDP lines containing complete ASF Headers (several
 484      * kB) or arrays of MDPR (RM stream descriptor) headers plus
 485      * "rulebooks" describing their properties. Therefore, the SDP line
 486      * buffer is large.
 487      *
 488      * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
 489      * in rtpdec_xiph.c. */
 490     char buf[16384], *q;
 491     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
 492
 493     memset(s1, 0, sizeof(SDPParseState));
 494     p = content;
 495     for (;;) {
 496         p += strspn(p, SPACE_CHARS);
 497         letter = *p;
 498         if (letter == '\0')
 499             break;
 500         p++;
 501         if (*p != '=')
 502             goto next_line;
 503         p++;
 504         /* get the content */
 505         q = buf;
 506         while (*p != '\n' && *p != '\r' && *p != '\0') {
 507             if ((q - buf) < sizeof(buf) - 1)
 508                 *q++ = *p;
 509             p++;
 510         }
 511         *q = '\0';
 512         sdp_parse_line(s, s1, letter, buf);
 513     next_line:
 514         while (*p != '\n' && *p != '\0')
 515             p++;
 516         if (*p == '\n')
 517             p++;
 518     }
 519     rt->p = av_malloc(sizeof(struct pollfd)*2*(rt->nb_rtsp_streams+1));
 520     if (!rt->p) return AVERROR(ENOMEM);
 521     return 0;
 522 }
 523 #endif /* CONFIG_RTPDEC */
 524
 525 void ff_rtsp_undo_setup(AVFormatContext *s)
 526 {
 527     RTSPState *rt = s->priv_data;
 528     int i;
 529
 530     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 531         RTSPStream *rtsp_st = rt->rtsp_streams[i];
 532         if (!rtsp_st)
 533             continue;
 534         if (rtsp_st->transport_priv) {
 535             if (s->oformat) {
 536                 AVFormatContext *rtpctx = rtsp_st->transport_priv;
 537                 av_write_trailer(rtpctx);
 538                 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 539                     uint8_t *ptr;
 540                     avio_close_dyn_buf(rtpctx->pb, &ptr);
 541                     av_free(ptr);
 542                 } else {
 543                     avio_close(rtpctx->pb);
 544                 }
 545                 avformat_free_context(rtpctx);
 546             } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
 547                 ff_rdt_parse_close(rtsp_st->transport_priv);
 548             else if (CONFIG_RTPDEC)
 549                 ff_rtp_parse_close(rtsp_st->transport_priv);
 550         }
 551         rtsp_st->transport_priv = NULL;
 552         if (rtsp_st->rtp_handle)
 553             ffurl_close(rtsp_st->rtp_handle);
 554         rtsp_st->rtp_handle = NULL;
 555     }
 556 }
 557
 558 /* close and free RTSP streams */
 559 void ff_rtsp_close_streams(AVFormatContext *s)
 560 {
 561     RTSPState *rt = s->priv_data;
 562     int i;
 563     RTSPStream *rtsp_st;
 564
 565     ff_rtsp_undo_setup(s);
 566     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 567         rtsp_st = rt->rtsp_streams[i];
 568         if (rtsp_st) {
 569             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
 570                 rtsp_st->dynamic_handler->free(
 571                     rtsp_st->dynamic_protocol_context);
 572             av_free(rtsp_st);
 573         }
 574     }
 575     av_free(rt->rtsp_streams);
 576     if (rt->asf_ctx) {
 577         av_close_input_stream (rt->asf_ctx);
 578         rt->asf_ctx = NULL;
 579     }
 580     av_free(rt->p);
 581     av_free(rt->recvbuf);
 582 }
 583
 584 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 585 {
 586     RTSPState *rt = s->priv_data;
 587     AVStream *st = NULL;
 588
 589     /* open the RTP context */
 590     if (rtsp_st->stream_index >= 0)
 591         st = s->streams[rtsp_st->stream_index];
 592     if (!st)
 593         s->ctx_flags |= AVFMTCTX_NOHEADER;
 594
 595     if (s->oformat && CONFIG_RTSP_MUXER) {
 596         rtsp_st->transport_priv = ff_rtp_chain_mux_open(s, st,
 597                                       rtsp_st->rtp_handle,
 598                                       RTSP_TCP_MAX_PACKET_SIZE);
 599         /* Ownership of rtp_handle is passed to the rtp mux context */
 600         rtsp_st->rtp_handle = NULL;
 601     } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
 602         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
 603                                             rtsp_st->dynamic_protocol_context,
 604                                             rtsp_st->dynamic_handler);
 605     else if (CONFIG_RTPDEC)
 606         rtsp_st->transport_priv = ff_rtp_parse_open(s, st, rtsp_st->rtp_handle,
 607                                          rtsp_st->sdp_payload_type,
 608             (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP || !s->max_delay)
 609             ? 0 : RTP_REORDER_QUEUE_DEFAULT_SIZE);
 610
 611     if (!rtsp_st->transport_priv) {
 612          return AVERROR(ENOMEM);
 613     } else if (rt->transport != RTSP_TRANSPORT_RDT && CONFIG_RTPDEC) {
 614         if (rtsp_st->dynamic_handler) {
 615             ff_rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
 616                                               rtsp_st->dynamic_protocol_context,
 617                                               rtsp_st->dynamic_handler);
 618         }
 619     }
 620
 621     return 0;
 622 }
 623
 624 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
 625 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
 626 {
 627     const char *p;
 628     int v;
 629
 630     p = *pp;
 631     p += strspn(p, SPACE_CHARS);
 632     v = strtol(p, (char **)&p, 10);
 633     if (*p == '-') {
 634         p++;
 635         *min_ptr = v;
 636         v = strtol(p, (char **)&p, 10);
 637         *max_ptr = v;
 638     } else {
 639         *min_ptr = v;
 640         *max_ptr = v;
 641     }
 642     *pp = p;
 643 }
 644
 645 /* XXX: only one transport specification is parsed */
 646 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
 647 {
 648     char transport_protocol[16];
 649     char profile[16];
 650     char lower_transport[16];
 651     char parameter[16];
 652     RTSPTransportField *th;
 653     char buf[256];
 654
 655     reply->nb_transports = 0;
 656
 657     for (;;) {
 658         p += strspn(p, SPACE_CHARS);
 659         if (*p == '\0')
 660             break;
 661
 662         th = &reply->transports[reply->nb_transports];
 663
 664         get_word_sep(transport_protocol, sizeof(transport_protocol),
 665                      "/", &p);
 666         if (!av_strcasecmp (transport_protocol, "rtp")) {
 667             get_word_sep(profile, sizeof(profile), "/;,", &p);
 668             lower_transport[0] = '\0';
 669             /* rtp/avp/<protocol> */
 670             if (*p == '/') {
 671                 get_word_sep(lower_transport, sizeof(lower_transport),
 672                              ";,", &p);
 673             }
 674             th->transport = RTSP_TRANSPORT_RTP;
 675         } else if (!av_strcasecmp (transport_protocol, "x-pn-tng") ||
 676                    !av_strcasecmp (transport_protocol, "x-real-rdt")) {
 677             /* x-pn-tng/<protocol> */
 678             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
 679             profile[0] = '\0';
 680             th->transport = RTSP_TRANSPORT_RDT;
 681         }
 682         if (!av_strcasecmp(lower_transport, "TCP"))
 683             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
 684         else
 685             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
 686
 687         if (*p == ';')
 688             p++;
 689         /* get each parameter */
 690         while (*p != '\0' && *p != ',') {
 691             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
 692             if (!strcmp(parameter, "port")) {
 693                 if (*p == '=') {
 694                     p++;
 695                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
 696                 }
 697             } else if (!strcmp(parameter, "client_port")) {
 698                 if (*p == '=') {
 699                     p++;
 700                     rtsp_parse_range(&th->client_port_min,
 701                                      &th->client_port_max, &p);
 702                 }
 703             } else if (!strcmp(parameter, "server_port")) {
 704                 if (*p == '=') {
 705                     p++;
 706                     rtsp_parse_range(&th->server_port_min,
 707                                      &th->server_port_max, &p);
 708                 }
 709             } else if (!strcmp(parameter, "interleaved")) {
 710                 if (*p == '=') {
 711                     p++;
 712                     rtsp_parse_range(&th->interleaved_min,
 713                                      &th->interleaved_max, &p);
 714                 }
 715             } else if (!strcmp(parameter, "multicast")) {
 716                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
 717                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
 718             } else if (!strcmp(parameter, "ttl")) {
 719                 if (*p == '=') {
 720                     p++;
 721                     th->ttl = strtol(p, (char **)&p, 10);
 722                 }
 723             } else if (!strcmp(parameter, "destination")) {
 724                 if (*p == '=') {
 725                     p++;
 726                     get_word_sep(buf, sizeof(buf), ";,", &p);
 727                     get_sockaddr(buf, &th->destination);
 728                 }
 729             } else if (!strcmp(parameter, "source")) {
 730                 if (*p == '=') {
 731                     p++;
 732                     get_word_sep(buf, sizeof(buf), ";,", &p);
 733                     av_strlcpy(th->source, buf, sizeof(th->source));
 734                 }
 735             }
 736
 737             while (*p != ';' && *p != '\0' && *p != ',')
 738                 p++;
 739             if (*p == ';')
 740                 p++;
 741         }
 742         if (*p == ',')
 743             p++;
 744
 745         reply->nb_transports++;
 746     }
 747 }
 748
 749 static void handle_rtp_info(RTSPState *rt, const char *url,
 750                             uint32_t seq, uint32_t rtptime)
 751 {
 752     int i;
 753     if (!rtptime || !url[0])
 754         return;
 755     if (rt->transport != RTSP_TRANSPORT_RTP)
 756         return;
 757     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 758         RTSPStream *rtsp_st = rt->rtsp_streams[i];
 759         RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
 760         if (!rtpctx)
 761             continue;
 762         if (!strcmp(rtsp_st->control_url, url)) {
 763             rtpctx->base_timestamp = rtptime;
 764             break;
 765         }
 766     }
 767 }
 768
 769 static void rtsp_parse_rtp_info(RTSPState *rt, const char *p)
 770 {
 771     int read = 0;
 772     char key[20], value[1024], url[1024] = "";
 773     uint32_t seq = 0, rtptime = 0;
 774
 775     for (;;) {
 776         p += strspn(p, SPACE_CHARS);
 777         if (!*p)
 778             break;
 779         get_word_sep(key, sizeof(key), "=", &p);
 780         if (*p != '=')
 781             break;
 782         p++;
 783         get_word_sep(value, sizeof(value), ";, ", &p);
 784         read++;
 785         if (!strcmp(key, "url"))
 786             av_strlcpy(url, value, sizeof(url));
 787         else if (!strcmp(key, "seq"))
 788             seq = strtoul(value, NULL, 10);
 789         else if (!strcmp(key, "rtptime"))
 790             rtptime = strtoul(value, NULL, 10);
 791         if (*p == ',') {
 792             handle_rtp_info(rt, url, seq, rtptime);
 793             url[0] = '\0';
 794             seq = rtptime = 0;
 795             read = 0;
 796         }
 797         if (*p)
 798             p++;
 799     }
 800     if (read > 0)
 801         handle_rtp_info(rt, url, seq, rtptime);
 802 }
 803
 804 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
 805                         RTSPState *rt, const char *method)
 806 {
 807     const char *p;
 808
 809     /* NOTE: we do case independent match for broken servers */
 810     p = buf;
 811     if (av_stristart(p, "Session:", &p)) {
 812         int t;
 813         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
 814         if (av_stristart(p, ";timeout=", &p) &&
 815             (t = strtol(p, NULL, 10)) > 0) {
 816             reply->timeout = t;
 817         }
 818     } else if (av_stristart(p, "Content-Length:", &p)) {
 819         reply->content_length = strtol(p, NULL, 10);
 820     } else if (av_stristart(p, "Transport:", &p)) {
 821         rtsp_parse_transport(reply, p);
 822     } else if (av_stristart(p, "CSeq:", &p)) {
 823         reply->seq = strtol(p, NULL, 10);
 824     } else if (av_stristart(p, "Range:", &p)) {
 825         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
 826     } else if (av_stristart(p, "RealChallenge1:", &p)) {
 827         p += strspn(p, SPACE_CHARS);
 828         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
 829     } else if (av_stristart(p, "Server:", &p)) {
 830         p += strspn(p, SPACE_CHARS);
 831         av_strlcpy(reply->server, p, sizeof(reply->server));
 832     } else if (av_stristart(p, "Notice:", &p) ||
 833                av_stristart(p, "X-Notice:", &p)) {
 834         reply->notice = strtol(p, NULL, 10);
 835     } else if (av_stristart(p, "Location:", &p)) {
 836         p += strspn(p, SPACE_CHARS);
 837         av_strlcpy(reply->location, p , sizeof(reply->location));
 838     } else if (av_stristart(p, "WWW-Authenticate:", &p) && rt) {
 839         p += strspn(p, SPACE_CHARS);
 840         ff_http_auth_handle_header(&rt->auth_state, "WWW-Authenticate", p);
 841     } else if (av_stristart(p, "Authentication-Info:", &p) && rt) {
 842         p += strspn(p, SPACE_CHARS);
 843         ff_http_auth_handle_header(&rt->auth_state, "Authentication-Info", p);
 844     } else if (av_stristart(p, "Content-Base:", &p) && rt) {
 845         p += strspn(p, SPACE_CHARS);
 846         if (method && !strcmp(method, "DESCRIBE"))
 847             av_strlcpy(rt->control_uri, p , sizeof(rt->control_uri));
 848     } else if (av_stristart(p, "RTP-Info:", &p) && rt) {
 849         p += strspn(p, SPACE_CHARS);
 850         if (method && !strcmp(method, "PLAY"))
 851             rtsp_parse_rtp_info(rt, p);
 852     } else if (av_stristart(p, "Public:", &p) && rt) {
 853         if (strstr(p, "GET_PARAMETER") &&
 854             method && !strcmp(method, "OPTIONS"))
 855             rt->get_parameter_supported = 1;
 856     } else if (av_stristart(p, "x-Accept-Dynamic-Rate:", &p) && rt) {
 857         p += strspn(p, SPACE_CHARS);
 858         rt->accept_dynamic_rate = atoi(p);
 859     }
 860 }
 861
 862 /* skip a RTP/TCP interleaved packet */
 863 void ff_rtsp_skip_packet(AVFormatContext *s)
 864 {
 865     RTSPState *rt = s->priv_data;
 866     int ret, len, len1;
 867     uint8_t buf[1024];
 868
 869     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
 870     if (ret != 3)
 871         return;
 872     len = AV_RB16(buf + 1);
 873
 874     av_dlog(s, "skipping RTP packet len=%d\n", len);
 875
 876     /* skip payload */
 877     while (len > 0) {
 878         len1 = len;
 879         if (len1 > sizeof(buf))
 880             len1 = sizeof(buf);
 881         ret = ffurl_read_complete(rt->rtsp_hd, buf, len1);
 882         if (ret != len1)
 883             return;
 884         len -= len1;
 885     }
 886 }
 887
 888 int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
 889                        unsigned char **content_ptr,
 890                        int return_on_interleaved_data, const char *method)
 891 {
 892     RTSPState *rt = s->priv_data;
 893     char buf[4096], buf1[1024], *q;
 894     unsigned char ch;
 895     const char *p;
 896     int ret, content_length, line_count = 0;
 897     unsigned char *content = NULL;
 898
 899     memset(reply, 0, sizeof(*reply));
 900
 901     /* parse reply (XXX: use buffers) */
 902     rt->last_reply[0] = '\0';
 903     for (;;) {
 904         q = buf;
 905         for (;;) {
 906             ret = ffurl_read_complete(rt->rtsp_hd, &ch, 1);
 907             av_dlog(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
 908             if (ret != 1)
 909                 return AVERROR_EOF;
 910             if (ch == '\n')
 911                 break;
 912             if (ch == '$') {
 913                 /* XXX: only parse it if first char on line ? */
 914                 if (return_on_interleaved_data) {
 915                     return 1;
 916                 } else
 917                     ff_rtsp_skip_packet(s);
 918             } else if (ch != '\r') {
 919                 if ((q - buf) < sizeof(buf) - 1)
 920                     *q++ = ch;
 921             }
 922         }
 923         *q = '\0';
 924
 925         av_dlog(s, "line='%s'\n", buf);
 926
 927         /* test if last line */
 928         if (buf[0] == '\0')
 929             break;
 930         p = buf;
 931         if (line_count == 0) {
 932             /* get reply code */
 933             get_word(buf1, sizeof(buf1), &p);
 934             get_word(buf1, sizeof(buf1), &p);
 935             reply->status_code = atoi(buf1);
 936             av_strlcpy(reply->reason, p, sizeof(reply->reason));
 937         } else {
 938             ff_rtsp_parse_line(reply, p, rt, method);
 939             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
 940             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
 941         }
 942         line_count++;
 943     }
 944
 945     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
 946         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
 947
 948     content_length = reply->content_length;
 949     if (content_length > 0) {
 950         /* leave some room for a trailing '\0' (useful for simple parsing) */
 951         content = av_malloc(content_length + 1);
 952         ffurl_read_complete(rt->rtsp_hd, content, content_length);
 953         content[content_length] = '\0';
 954     }
 955     if (content_ptr)
 956         *content_ptr = content;
 957     else
 958         av_free(content);
 959
 960     if (rt->seq != reply->seq) {
 961         av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
 962             rt->seq, reply->seq);
 963     }
 964
 965     /* EOS */
 966     if (reply->notice == 2101 /* End-of-Stream Reached */      ||
 967         reply->notice == 2104 /* Start-of-Stream Reached */    ||
 968         reply->notice == 2306 /* Continuous Feed Terminated */) {
 969         rt->state = RTSP_STATE_IDLE;
 970     } else if (reply->notice >= 4400 && reply->notice < 5500) {
 971         return AVERROR(EIO); /* data or server error */
 972     } else if (reply->notice == 2401 /* Ticket Expired */ ||
 973              (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
 974         return AVERROR(EPERM);
 975
 976     return 0;
 977 }
 978
 979 /**
 980  * Send a command to the RTSP server without waiting for the reply.
 981  *
 982  * @param s RTSP (de)muxer context
 983  * @param method the method for the request
 984  * @param url the target url for the request
 985  * @param headers extra header lines to include in the request
 986  * @param send_content if non-null, the data to send as request body content
 987  * @param send_content_length the length of the send_content data, or 0 if
 988  *                            send_content is null
 989  *
 990  * @return zero if success, nonzero otherwise
 991  */
 992 static int ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
 993                                                const char *method, const char *url,
 994                                                const char *headers,
 995                                                const unsigned char *send_content,
 996                                                int send_content_length)
 997 {
 998     RTSPState *rt = s->priv_data;
 999     char buf[4096], *out_buf;
1000     char base64buf[AV_BASE64_SIZE(sizeof(buf))];
1001
1002     /* Add in RTSP headers */
1003     out_buf = buf;
1004     rt->seq++;
1005     snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1006     if (headers)
1007         av_strlcat(buf, headers, sizeof(buf));
1008     av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1009     if (rt->session_id[0] != '\0' && (!headers ||
1010         !strstr(headers, "\nIf-Match:"))) {
1011         av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1012     }
1013     if (rt->auth[0]) {
1014         char *str = ff_http_auth_create_response(&rt->auth_state,
1015                                                  rt->auth, url, method);
1016         if (str)
1017             av_strlcat(buf, str, sizeof(buf));
1018         av_free(str);
1019     }
1020     if (send_content_length > 0 && send_content)
1021         av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1022     av_strlcat(buf, "\r\n", sizeof(buf));
1023
1024     /* base64 encode rtsp if tunneling */
1025     if (rt->control_transport == RTSP_MODE_TUNNEL) {
1026         av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
1027         out_buf = base64buf;
1028     }
1029
1030     av_dlog(s, "Sending:\n%s--\n", buf);
1031
1032     ffurl_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
1033     if (send_content_length > 0 && send_content) {
1034         if (rt->control_transport == RTSP_MODE_TUNNEL) {
1035             av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
1036                                     "with content data not supported\n");
1037             return AVERROR_PATCHWELCOME;
1038         }
1039         ffurl_write(rt->rtsp_hd_out, send_content, send_content_length);
1040     }
1041     rt->last_cmd_time = av_gettime();
1042
1043     return 0;
1044 }
1045
1046 int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1047                            const char *url, const char *headers)
1048 {
1049     return ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1050 }
1051
1052 int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1053                      const char *headers, RTSPMessageHeader *reply,
1054                      unsigned char **content_ptr)
1055 {
1056     return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1057                                          content_ptr, NULL, 0);
1058 }
1059
1060 int ff_rtsp_send_cmd_with_content(AVFormatContext *s,
1061                                   const char *method, const char *url,
1062                                   const char *header,
1063                                   RTSPMessageHeader *reply,
1064                                   unsigned char **content_ptr,
1065                                   const unsigned char *send_content,
1066                                   int send_content_length)
1067 {
1068     RTSPState *rt = s->priv_data;
1069     HTTPAuthType cur_auth_type;
1070     int ret;
1071
1072 retry:
1073     cur_auth_type = rt->auth_state.auth_type;
1074     if ((ret = ff_rtsp_send_cmd_with_content_async(s, method, url, header,
1075                                                    send_content,
1076                                                    send_content_length)))
1077         return ret;
1078
1079     if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0, method) ) < 0)
1080         return ret;
1081
1082     if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
1083         rt->auth_state.auth_type != HTTP_AUTH_NONE)
1084         goto retry;
1085
1086     if (reply->status_code > 400){
1087         av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
1088                method,
1089                reply->status_code,
1090                reply->reason);
1091         av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
1092     }
1093
1094     return 0;
1095 }
1096
1097 int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
1098                               int lower_transport, const char *real_challenge)
1099 {
1100     RTSPState *rt = s->priv_data;
1101     int rtx, j, i, err, interleave = 0;
1102     RTSPStream *rtsp_st;
1103     RTSPMessageHeader reply1, *reply = &reply1;
1104     char cmd[2048];
1105     const char *trans_pref;
1106
1107     if (rt->transport == RTSP_TRANSPORT_RDT)
1108         trans_pref = "x-pn-tng";
1109     else
1110         trans_pref = "RTP/AVP";
1111
1112     /* default timeout: 1 minute */
1113     rt->timeout = 60;
1114
1115     /* for each stream, make the setup request */
1116     /* XXX: we assume the same server is used for the control of each
1117      * RTSP stream */
1118
1119     for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1120         char transport[2048];
1121
1122         /*
1123          * WMS serves all UDP data over a single connection, the RTX, which
1124          * isn't necessarily the first in the SDP but has to be the first
1125          * to be set up, else the second/third SETUP will fail with a 461.
1126          */
1127         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1128              rt->server_type == RTSP_SERVER_WMS) {
1129             if (i == 0) {
1130                 /* rtx first */
1131                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1132                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
1133                     if (len >= 4 &&
1134                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1135                                 "/rtx"))
1136                         break;
1137                 }
1138                 if (rtx == rt->nb_rtsp_streams)
1139                     return -1; /* no RTX found */
1140                 rtsp_st = rt->rtsp_streams[rtx];
1141             } else
1142                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1143         } else
1144             rtsp_st = rt->rtsp_streams[i];
1145
1146         /* RTP/UDP */
1147         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1148             char buf[256];
1149
1150             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1151                 port = reply->transports[0].client_port_min;
1152                 goto have_port;
1153             }
1154
1155             /* first try in specified port range */
1156             if (RTSP_RTP_PORT_MIN != 0) {
1157                 while (j <= RTSP_RTP_PORT_MAX) {
1158                     ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1159                                 "?localport=%d", j);
1160                     /* we will use two ports per rtp stream (rtp and rtcp) */
1161                     j += 2;
1162                     if (ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE) == 0)
1163                         goto rtp_opened;
1164                 }
1165             }
1166
1167             av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
1168             err = AVERROR(EIO);
1169             goto fail;
1170
1171         rtp_opened:
1172             port = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
1173         have_port:
1174             snprintf(transport, sizeof(transport) - 1,
1175                      "%s/UDP;", trans_pref);
1176             if (rt->server_type != RTSP_SERVER_REAL)
1177                 av_strlcat(transport, "unicast;", sizeof(transport));
1178             av_strlcatf(transport, sizeof(transport),
1179                      "client_port=%d", port);
1180             if (rt->transport == RTSP_TRANSPORT_RTP &&
1181                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1182                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1183         }
1184
1185         /* RTP/TCP */
1186         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1187             /* For WMS streams, the application streams are only used for
1188              * UDP. When trying to set it up for TCP streams, the server
1189              * will return an error. Therefore, we skip those streams. */
1190             if (rt->server_type == RTSP_SERVER_WMS &&
1191                 s->streams[rtsp_st->stream_index]->codec->codec_type ==
1192                     AVMEDIA_TYPE_DATA)
1193                 continue;
1194             snprintf(transport, sizeof(transport) - 1,
1195                      "%s/TCP;", trans_pref);
1196             if (rt->transport != RTSP_TRANSPORT_RDT)
1197                 av_strlcat(transport, "unicast;", sizeof(transport));
1198             av_strlcatf(transport, sizeof(transport),
1199                         "interleaved=%d-%d",
1200                         interleave, interleave + 1);
1201             interleave += 2;
1202         }
1203
1204         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1205             snprintf(transport, sizeof(transport) - 1,
1206                      "%s/UDP;multicast", trans_pref);
1207         }
1208         if (s->oformat) {
1209             av_strlcat(transport, ";mode=receive", sizeof(transport));
1210         } else if (rt->server_type == RTSP_SERVER_REAL ||
1211                    rt->server_type == RTSP_SERVER_WMS)
1212             av_strlcat(transport, ";mode=play", sizeof(transport));
1213         snprintf(cmd, sizeof(cmd),
1214                  "Transport: %s\r\n",
1215                  transport);
1216         if (rt->accept_dynamic_rate)
1217             av_strlcat(cmd, "x-Dynamic-Rate: 0\r\n", sizeof(cmd));
1218         if (i == 0 && rt->server_type == RTSP_SERVER_REAL && CONFIG_RTPDEC) {
1219             char real_res[41], real_csum[9];
1220             ff_rdt_calc_response_and_checksum(real_res, real_csum,
1221                                               real_challenge);
1222             av_strlcatf(cmd, sizeof(cmd),
1223                         "If-Match: %s\r\n"
1224                         "RealChallenge2: %s, sd=%s\r\n",
1225                         rt->session_id, real_res, real_csum);
1226         }
1227         ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1228         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1229             err = 1;
1230             goto fail;
1231         } else if (reply->status_code != RTSP_STATUS_OK ||
1232                    reply->nb_transports != 1) {
1233             err = AVERROR_INVALIDDATA;
1234             goto fail;
1235         }
1236
1237         /* XXX: same protocol for all streams is required */
1238         if (i > 0) {
1239             if (reply->transports[0].lower_transport != rt->lower_transport ||
1240                 reply->transports[0].transport != rt->transport) {
1241                 err = AVERROR_INVALIDDATA;
1242                 goto fail;
1243             }
1244         } else {
1245             rt->lower_transport = reply->transports[0].lower_transport;
1246             rt->transport = reply->transports[0].transport;
1247         }
1248
1249         /* Fail if the server responded with another lower transport mode
1250          * than what we requested. */
1251         if (reply->transports[0].lower_transport != lower_transport) {
1252             av_log(s, AV_LOG_ERROR, "Nonmatching transport in server reply\n");
1253             err = AVERROR_INVALIDDATA;
1254             goto fail;
1255         }
1256
1257         switch(reply->transports[0].lower_transport) {
1258         case RTSP_LOWER_TRANSPORT_TCP:
1259             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1260             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1261             break;
1262
1263         case RTSP_LOWER_TRANSPORT_UDP: {
1264             char url[1024], options[30] = "";
1265
1266             if (rt->rtsp_flags & RTSP_FLAG_FILTER_SRC)
1267                 av_strlcpy(options, "?connect=1", sizeof(options));
1268             /* Use source address if specified */
1269             if (reply->transports[0].source[0]) {
1270                 ff_url_join(url, sizeof(url), "rtp", NULL,
1271                             reply->transports[0].source,
1272                             reply->transports[0].server_port_min, "%s", options);
1273             } else {
1274                 ff_url_join(url, sizeof(url), "rtp", NULL, host,
1275                             reply->transports[0].server_port_min, "%s", options);
1276             }
1277             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1278                 ff_rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1279                 err = AVERROR_INVALIDDATA;
1280                 goto fail;
1281             }
1282             /* Try to initialize the connection state in a
1283              * potential NAT router by sending dummy packets.
1284              * RTP/RTCP dummy packets are used for RDT, too.
1285              */
1286             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat &&
1287                 CONFIG_RTPDEC)
1288                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
1289             break;
1290         }
1291         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1292             char url[1024], namebuf[50];
1293             struct sockaddr_storage addr;
1294             int port, ttl;
1295
1296             if (reply->transports[0].destination.ss_family) {
1297                 addr      = reply->transports[0].destination;
1298                 port      = reply->transports[0].port_min;
1299                 ttl       = reply->transports[0].ttl;
1300             } else {
1301                 addr      = rtsp_st->sdp_ip;
1302                 port      = rtsp_st->sdp_port;
1303                 ttl       = rtsp_st->sdp_ttl;
1304             }
1305             getnameinfo((struct sockaddr*) &addr, sizeof(addr),
1306                         namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
1307             ff_url_join(url, sizeof(url), "rtp", NULL, namebuf,
1308                         port, "?ttl=%d", ttl);
1309             if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE) < 0) {
1310                 err = AVERROR_INVALIDDATA;
1311                 goto fail;
1312             }
1313             break;
1314         }
1315         }
1316
1317         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1318             goto fail;
1319     }
1320
1321     if (reply->timeout > 0)
1322         rt->timeout = reply->timeout;
1323
1324     if (rt->server_type == RTSP_SERVER_REAL)
1325         rt->need_subscription = 1;
1326
1327     return 0;
1328
1329 fail:
1330     ff_rtsp_undo_setup(s);
1331     return err;
1332 }
1333
1334 void ff_rtsp_close_connections(AVFormatContext *s)
1335 {
1336     RTSPState *rt = s->priv_data;
1337     if (rt->rtsp_hd_out != rt->rtsp_hd) ffurl_close(rt->rtsp_hd_out);
1338     ffurl_close(rt->rtsp_hd);
1339     rt->rtsp_hd = rt->rtsp_hd_out = NULL;
1340 }
1341
1342 int ff_rtsp_connect(AVFormatContext *s)
1343 {
1344     RTSPState *rt = s->priv_data;
1345     char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1346     char *option_list, *option, *filename;
1347     int port, err, tcp_fd;
1348     RTSPMessageHeader reply1 = {0}, *reply = &reply1;
1349     int lower_transport_mask = 0;
1350     char real_challenge[64] = "";
1351     struct sockaddr_storage peer;
1352     socklen_t peer_len = sizeof(peer);
1353
1354     if (!ff_network_init())
1355         return AVERROR(EIO);
1356
1357     rt->control_transport = RTSP_MODE_PLAIN;
1358     if (rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_HTTP)) {
1359         rt->lower_transport_mask = 1 << RTSP_LOWER_TRANSPORT_TCP;
1360         rt->control_transport = RTSP_MODE_TUNNEL;
1361     }
1362     /* Only pass through valid flags from here */
1363     rt->lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1364
1365 redirect:
1366     lower_transport_mask = rt->lower_transport_mask;
1367     /* extract hostname and port */
1368     av_url_split(NULL, 0, auth, sizeof(auth),
1369                  host, sizeof(host), &port, path, sizeof(path), s->filename);
1370     if (*auth) {
1371         av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1372     }
1373     if (port < 0)
1374         port = RTSP_DEFAULT_PORT;
1375
1376 #if FF_API_RTSP_URL_OPTIONS
1377     /* search for options */
1378     option_list = strrchr(path, '?');
1379     if (option_list) {
1380         /* Strip out the RTSP specific options, write out the rest of
1381          * the options back into the same string. */
1382         filename = option_list;
1383         while (option_list) {
1384             int handled = 1;
1385             /* move the option pointer */
1386             option = ++option_list;
1387             option_list = strchr(option_list, '&');
1388             if (option_list)
1389                 *option_list = 0;
1390
1391             /* handle the options */
1392             if (!strcmp(option, "udp")) {
1393                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1394             } else if (!strcmp(option, "multicast")) {
1395                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1396             } else if (!strcmp(option, "tcp")) {
1397                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1398             } else if(!strcmp(option, "http")) {
1399                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1400                 rt->control_transport = RTSP_MODE_TUNNEL;
1401             } else if (!strcmp(option, "filter_src")) {
1402                 rt->rtsp_flags |= RTSP_FLAG_FILTER_SRC;
1403             } else {
1404                 /* Write options back into the buffer, using memmove instead
1405                  * of strcpy since the strings may overlap. */
1406                 int len = strlen(option);
1407                 memmove(++filename, option, len);
1408                 filename += len;
1409                 if (option_list) *filename = '&';
1410                 handled = 0;
1411             }
1412             if (handled)
1413                 av_log(s, AV_LOG_WARNING, "Options passed via URL are "
1414                                           "deprecated, use -rtsp_transport "
1415                                           "and -rtsp_flags instead.\n");
1416         }
1417         *filename = 0;
1418     }
1419 #endif
1420
1421     if (!lower_transport_mask)
1422         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1423
1424     if (s->oformat) {
1425         /* Only UDP or TCP - UDP multicast isn't supported. */
1426         lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1427                                 (1 << RTSP_LOWER_TRANSPORT_TCP);
1428         if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
1429             av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1430                                     "only UDP and TCP are supported for output.\n");
1431             err = AVERROR(EINVAL);
1432             goto fail;
1433         }
1434     }
1435
1436     /* Construct the URI used in request; this is similar to s->filename,
1437      * but with authentication credentials removed and RTSP specific options
1438      * stripped out. */
1439     ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1440                 host, port, "%s", path);
1441
1442     if (rt->control_transport == RTSP_MODE_TUNNEL) {
1443         /* set up initial handshake for tunneling */
1444         char httpname[1024];
1445         char sessioncookie[17];
1446         char headers[1024];
1447
1448         ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
1449         snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
1450                  av_get_random_seed(), av_get_random_seed());
1451
1452         /* GET requests */
1453         if (ffurl_alloc(&rt->rtsp_hd, httpname, AVIO_FLAG_READ) < 0) {
1454             err = AVERROR(EIO);
1455             goto fail;
1456         }
1457
1458         /* generate GET headers */
1459         snprintf(headers, sizeof(headers),
1460                  "x-sessioncookie: %s\r\n"
1461                  "Accept: application/x-rtsp-tunnelled\r\n"
1462                  "Pragma: no-cache\r\n"
1463                  "Cache-Control: no-cache\r\n",
1464                  sessioncookie);
1465         av_opt_set(rt->rtsp_hd->priv_data, "headers", headers, 0);
1466
1467         /* complete the connection */
1468         if (ffurl_connect(rt->rtsp_hd)) {
1469             err = AVERROR(EIO);
1470             goto fail;
1471         }
1472
1473         /* POST requests */
1474         if (ffurl_alloc(&rt->rtsp_hd_out, httpname, AVIO_FLAG_WRITE) < 0 ) {
1475             err = AVERROR(EIO);
1476             goto fail;
1477         }
1478
1479         /* generate POST headers */
1480         snprintf(headers, sizeof(headers),
1481                  "x-sessioncookie: %s\r\n"
1482                  "Content-Type: application/x-rtsp-tunnelled\r\n"
1483                  "Pragma: no-cache\r\n"
1484                  "Cache-Control: no-cache\r\n"
1485                  "Content-Length: 32767\r\n"
1486                  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
1487                  sessioncookie);
1488         av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
1489         av_opt_set(rt->rtsp_hd_out->priv_data, "chunksize", "-1", 0);
1490
1491         /* Initialize the authentication state for the POST session. The HTTP
1492          * protocol implementation doesn't properly handle multi-pass
1493          * authentication for POST requests, since it would require one of
1494          * the following:
1495          * - implementing Expect: 100-continue, which many HTTP servers
1496          *   don't support anyway, even less the RTSP servers that do HTTP
1497          *   tunneling
1498          * - sending the whole POST data until getting a 401 reply specifying
1499          *   what authentication method to use, then resending all that data
1500          * - waiting for potential 401 replies directly after sending the
1501          *   POST header (waiting for some unspecified time)
1502          * Therefore, we copy the full auth state, which works for both basic
1503          * and digest. (For digest, we would have to synchronize the nonce
1504          * count variable between the two sessions, if we'd do more requests
1505          * with the original session, though.)
1506          */
1507         ff_http_init_auth_state(rt->rtsp_hd_out, rt->rtsp_hd);
1508
1509         /* complete the connection */
1510         if (ffurl_connect(rt->rtsp_hd_out)) {
1511             err = AVERROR(EIO);
1512             goto fail;
1513         }
1514     } else {
1515         /* open the tcp connection */
1516         ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1517         if (ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE) < 0) {
1518             err = AVERROR(EIO);
1519             goto fail;
1520         }
1521         rt->rtsp_hd_out = rt->rtsp_hd;
1522     }
1523     rt->seq = 0;
1524
1525     tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1526     if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1527         getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1528                     NULL, 0, NI_NUMERICHOST);
1529     }
1530
1531     /* request options supported by the server; this also detects server
1532      * type */
1533     for (rt->server_type = RTSP_SERVER_RTP;;) {
1534         cmd[0] = 0;
1535         if (rt->server_type == RTSP_SERVER_REAL)
1536             av_strlcat(cmd,
1537                        /*
1538                         * The following entries are required for proper
1539                         * streaming from a Realmedia server. They are
1540                         * interdependent in some way although we currently
1541                         * don't quite understand how. Values were copied
1542                         * from mplayer SVN r23589.
1543                         *   ClientChallenge is a 16-byte ID in hex
1544                         *   CompanyID is a 16-byte ID in base64
1545                         */
1546                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1547                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1548                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1549                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1550                        sizeof(cmd));
1551         ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1552         if (reply->status_code != RTSP_STATUS_OK) {
1553             err = AVERROR_INVALIDDATA;
1554             goto fail;
1555         }
1556
1557         /* detect server type if not standard-compliant RTP */
1558         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1559             rt->server_type = RTSP_SERVER_REAL;
1560             continue;
1561         } else if (!av_strncasecmp(reply->server, "WMServer/", 9)) {
1562             rt->server_type = RTSP_SERVER_WMS;
1563         } else if (rt->server_type == RTSP_SERVER_REAL)
1564             strcpy(real_challenge, reply->real_challenge);
1565         break;
1566     }
1567
1568     if (s->iformat && CONFIG_RTSP_DEMUXER)
1569         err = ff_rtsp_setup_input_streams(s, reply);
1570     else if (CONFIG_RTSP_MUXER)
1571         err = ff_rtsp_setup_output_streams(s, host);
1572     if (err)
1573         goto fail;
1574
1575     do {
1576         int lower_transport = ff_log2_tab[lower_transport_mask &
1577                                   ~(lower_transport_mask - 1)];
1578
1579         err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
1580                                  rt->server_type == RTSP_SERVER_REAL ?
1581                                      real_challenge : NULL);
1582         if (err < 0)
1583             goto fail;
1584         lower_transport_mask &= ~(1 << lower_transport);
1585         if (lower_transport_mask == 0 && err == 1) {
1586             err = AVERROR(EPROTONOSUPPORT);
1587             goto fail;
1588         }
1589     } while (err);
1590
1591     rt->lower_transport_mask = lower_transport_mask;
1592     av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge));
1593     rt->state = RTSP_STATE_IDLE;
1594     rt->seek_timestamp = 0; /* default is to start stream at position zero */
1595     return 0;
1596  fail:
1597     ff_rtsp_close_streams(s);
1598     ff_rtsp_close_connections(s);
1599     if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1600         av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1601         av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1602                reply->status_code,
1603                s->filename);
1604         goto redirect;
1605     }
1606     ff_network_close();
1607     return err;
1608 }
1609 #endif /* CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER */
1610
1611 #if CONFIG_RTPDEC
1612 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1613                            uint8_t *buf, int buf_size, int64_t wait_end)
1614 {
1615     RTSPState *rt = s->priv_data;
1616     RTSPStream *rtsp_st;
1617     int n, i, ret, tcp_fd, timeout_cnt = 0;
1618     int max_p = 0;
1619     struct pollfd *p = rt->p;
1620
1621     for (;;) {
1622         if (url_interrupt_cb())
1623             return AVERROR_EXIT;
1624         if (wait_end && wait_end - av_gettime() < 0)
1625             return AVERROR(EAGAIN);
1626         max_p = 0;
1627         if (rt->rtsp_hd) {
1628             tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
1629             p[max_p].fd = tcp_fd;
1630             p[max_p++].events = POLLIN;
1631         } else {
1632             tcp_fd = -1;
1633         }
1634         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1635             rtsp_st = rt->rtsp_streams[i];
1636             if (rtsp_st->rtp_handle) {
1637                 p[max_p].fd = ffurl_get_file_handle(rtsp_st->rtp_handle);
1638                 p[max_p++].events = POLLIN;
1639                 p[max_p].fd = ff_rtp_get_rtcp_file_handle(rtsp_st->rtp_handle);
1640                 p[max_p++].events = POLLIN;
1641             }
1642         }
1643         n = poll(p, max_p, POLL_TIMEOUT_MS);
1644         if (n > 0) {
1645             int j = 1 - (tcp_fd == -1);
1646             timeout_cnt = 0;
1647             for (i = 0; i < rt->nb_rtsp_streams; i++) {
1648                 rtsp_st = rt->rtsp_streams[i];
1649                 if (rtsp_st->rtp_handle) {
1650                     if (p[j].revents & POLLIN || p[j+1].revents & POLLIN) {
1651                         ret = ffurl_read(rtsp_st->rtp_handle, buf, buf_size);
1652                         if (ret > 0) {
1653                             *prtsp_st = rtsp_st;
1654                             return ret;
1655                         }
1656                     }
1657                     j+=2;
1658                 }
1659             }
1660 #if CONFIG_RTSP_DEMUXER
1661             if (tcp_fd != -1 && p[0].revents & POLLIN) {
1662                 RTSPMessageHeader reply;
1663
1664                 ret = ff_rtsp_read_reply(s, &reply, NULL, 0, NULL);
1665                 if (ret < 0)
1666                     return ret;
1667                 /* XXX: parse message */
1668                 if (rt->state != RTSP_STATE_STREAMING)
1669                     return 0;
1670             }
1671 #endif
1672         } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1673             return AVERROR(ETIMEDOUT);
1674         } else if (n < 0 && errno != EINTR)
1675             return AVERROR(errno);
1676     }
1677 }
1678
1679 int ff_rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1680 {
1681     RTSPState *rt = s->priv_data;
1682     int ret, len;
1683     RTSPStream *rtsp_st, *first_queue_st = NULL;
1684     int64_t wait_end = 0;
1685
1686     if (rt->nb_byes == rt->nb_rtsp_streams)
1687         return AVERROR_EOF;
1688
1689     /* get next frames from the same RTP packet */
1690     if (rt->cur_transport_priv) {
1691         if (rt->transport == RTSP_TRANSPORT_RDT) {
1692             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1693         } else
1694             ret = ff_rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1695         if (ret == 0) {
1696             rt->cur_transport_priv = NULL;
1697             return 0;
1698         } else if (ret == 1) {
1699             return 0;
1700         } else
1701             rt->cur_transport_priv = NULL;
1702     }
1703
1704     if (rt->transport == RTSP_TRANSPORT_RTP) {
1705         int i;
1706         int64_t first_queue_time = 0;
1707         for (i = 0; i < rt->nb_rtsp_streams; i++) {
1708             RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
1709             int64_t queue_time;
1710             if (!rtpctx)
1711                 continue;
1712             queue_time = ff_rtp_queued_packet_time(rtpctx);
1713             if (queue_time && (queue_time - first_queue_time < 0 ||
1714                                !first_queue_time)) {
1715                 first_queue_time = queue_time;
1716                 first_queue_st   = rt->rtsp_streams[i];
1717             }
1718         }
1719         if (first_queue_time)
1720             wait_end = first_queue_time + s->max_delay;
1721     }
1722
1723     /* read next RTP packet */
1724  redo:
1725     if (!rt->recvbuf) {
1726         rt->recvbuf = av_malloc(RECVBUF_SIZE);
1727         if (!rt->recvbuf)
1728             return AVERROR(ENOMEM);
1729     }
1730
1731     switch(rt->lower_transport) {
1732     default:
1733 #if CONFIG_RTSP_DEMUXER
1734     case RTSP_LOWER_TRANSPORT_TCP:
1735         len = ff_rtsp_tcp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE);
1736         break;
1737 #endif
1738     case RTSP_LOWER_TRANSPORT_UDP:
1739     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1740         len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
1741         if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1742             ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1743         break;
1744     }
1745     if (len == AVERROR(EAGAIN) && first_queue_st &&
1746         rt->transport == RTSP_TRANSPORT_RTP) {
1747         rtsp_st = first_queue_st;
1748         ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, NULL, 0);
1749         goto end;
1750     }
1751     if (len < 0)
1752         return len;
1753     if (len == 0)
1754         return AVERROR_EOF;
1755     if (rt->transport == RTSP_TRANSPORT_RDT) {
1756         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
1757     } else {
1758         ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
1759         if (ret < 0) {
1760             /* Either bad packet, or a RTCP packet. Check if the
1761              * first_rtcp_ntp_time field was initialized. */
1762             RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1763             if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
1764                 /* first_rtcp_ntp_time has been initialized for this stream,
1765                  * copy the same value to all other uninitialized streams,
1766                  * in order to map their timestamp origin to the same ntp time
1767                  * as this one. */
1768                 int i;
1769                 AVStream *st = NULL;
1770                 if (rtsp_st->stream_index >= 0)
1771                     st = s->streams[rtsp_st->stream_index];
1772                 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1773                     RTPDemuxContext *rtpctx2 = rt->rtsp_streams[i]->transport_priv;
1774                     AVStream *st2 = NULL;
1775                     if (rt->rtsp_streams[i]->stream_index >= 0)
1776                         st2 = s->streams[rt->rtsp_streams[i]->stream_index];
1777                     if (rtpctx2 && st && st2 &&
1778                         rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
1779                         rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
1780                         rtpctx2->rtcp_ts_offset = av_rescale_q(
1781                             rtpctx->rtcp_ts_offset, st->time_base,
1782                             st2->time_base);
1783                     }
1784                 }
1785             }
1786             if (ret == -RTCP_BYE) {
1787                 rt->nb_byes++;
1788
1789                 av_log(s, AV_LOG_DEBUG, "Received BYE for stream %d (%d/%d)\n",
1790                        rtsp_st->stream_index, rt->nb_byes, rt->nb_rtsp_streams);
1791
1792                 if (rt->nb_byes == rt->nb_rtsp_streams)
1793                     return AVERROR_EOF;
1794             }
1795         }
1796     }
1797 end:
1798     if (ret < 0)
1799         goto redo;
1800     if (ret == 1)
1801         /* more packets may follow, so we save the RTP context */
1802         rt->cur_transport_priv = rtsp_st->transport_priv;
1803
1804     return ret;
1805 }
1806 #endif /* CONFIG_RTPDEC */
1807
1808 #if CONFIG_SDP_DEMUXER
1809 static int sdp_probe(AVProbeData *p1)
1810 {
1811     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1812
1813     /* we look for a line beginning "c=IN IP" */
1814     while (p < p_end && *p != '\0') {
1815         if (p + sizeof("c=IN IP") - 1 < p_end &&
1816             av_strstart(p, "c=IN IP", NULL))
1817             return AVPROBE_SCORE_MAX / 2;
1818
1819         while (p < p_end - 1 && *p != '\n') p++;
1820         if (++p >= p_end)
1821             break;
1822         if (*p == '\r')
1823             p++;
1824     }
1825     return 0;
1826 }
1827
1828 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1829 {
1830     RTSPState *rt = s->priv_data;
1831     RTSPStream *rtsp_st;
1832     int size, i, err;
1833     char *content;
1834     char url[1024];
1835
1836     if (!ff_network_init())
1837         return AVERROR(EIO);
1838
1839     /* read the whole sdp file */
1840     /* XXX: better loading */
1841     content = av_malloc(SDP_MAX_SIZE);
1842     size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
1843     if (size <= 0) {
1844         av_free(content);
1845         return AVERROR_INVALIDDATA;
1846     }
1847     content[size] ='\0';
1848
1849     err = ff_sdp_parse(s, content);
1850     av_free(content);
1851     if (err) goto fail;
1852
1853     /* open each RTP stream */
1854     for (i = 0; i < rt->nb_rtsp_streams; i++) {
1855         char namebuf[50];
1856         rtsp_st = rt->rtsp_streams[i];
1857
1858         getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
1859                     namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
1860         ff_url_join(url, sizeof(url), "rtp", NULL,
1861                     namebuf, rtsp_st->sdp_port,
1862                     "?localport=%d&ttl=%d&connect=%d", rtsp_st->sdp_port,
1863                     rtsp_st->sdp_ttl,
1864                     rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0);
1865         if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE) < 0) {
1866             err = AVERROR_INVALIDDATA;
1867             goto fail;
1868         }
1869         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1870             goto fail;
1871     }
1872     return 0;
1873 fail:
1874     ff_rtsp_close_streams(s);
1875     ff_network_close();
1876     return err;
1877 }
1878
1879 static int sdp_read_close(AVFormatContext *s)
1880 {
1881     ff_rtsp_close_streams(s);
1882     ff_network_close();
1883     return 0;
1884 }
1885
1886 static const AVClass sdp_demuxer_class = {
1887     .class_name     = "SDP demuxer",
1888     .item_name      = av_default_item_name,
1889     .option         = sdp_options,
1890     .version        = LIBAVUTIL_VERSION_INT,
1891 };
1892
1893 AVInputFormat ff_sdp_demuxer = {
1894     .name           = "sdp",
1895     .long_name      = NULL_IF_CONFIG_SMALL("SDP"),
1896     .priv_data_size = sizeof(RTSPState),
1897     .read_probe     = sdp_probe,
1898     .read_header    = sdp_read_header,
1899     .read_packet    = ff_rtsp_fetch_packet,
1900     .read_close     = sdp_read_close,
1901     .priv_class     = &sdp_demuxer_class
1902 };
1903 #endif /* CONFIG_SDP_DEMUXER */
1904
1905 #if CONFIG_RTP_DEMUXER
1906 static int rtp_probe(AVProbeData *p)
1907 {
1908     if (av_strstart(p->filename, "rtp:", NULL))
1909         return AVPROBE_SCORE_MAX;
1910     return 0;
1911 }
1912
1913 static int rtp_read_header(AVFormatContext *s,
1914                            AVFormatParameters *ap)
1915 {
1916     uint8_t recvbuf[1500];
1917     char host[500], sdp[500];
1918     int ret, port;
1919     URLContext* in = NULL;
1920     int payload_type;
1921     AVCodecContext codec;
1922     struct sockaddr_storage addr;
1923     AVIOContext pb;
1924     socklen_t addrlen = sizeof(addr);
1925
1926     if (!ff_network_init())
1927         return AVERROR(EIO);
1928
1929     ret = ffurl_open(&in, s->filename, AVIO_FLAG_READ);
1930     if (ret)
1931         goto fail;
1932
1933     while (1) {
1934         ret = ffurl_read(in, recvbuf, sizeof(recvbuf));
1935         if (ret == AVERROR(EAGAIN))
1936             continue;
1937         if (ret < 0)
1938             goto fail;
1939         if (ret < 12) {
1940             av_log(s, AV_LOG_WARNING, "Received too short packet\n");
1941             continue;
1942         }
1943
1944         if ((recvbuf[0] & 0xc0) != 0x80) {
1945             av_log(s, AV_LOG_WARNING, "Unsupported RTP version packet "
1946                                       "received\n");
1947             continue;
1948         }
1949
1950         payload_type = recvbuf[1] & 0x7f;
1951         break;
1952     }
1953     getsockname(ffurl_get_file_handle(in), (struct sockaddr*) &addr, &addrlen);
1954     ffurl_close(in);
1955     in = NULL;
1956
1957     memset(&codec, 0, sizeof(codec));
1958     if (ff_rtp_get_codec_info(&codec, payload_type)) {
1959         av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
1960                                 "without an SDP file describing it\n",
1961                                  payload_type);
1962         goto fail;
1963     }
1964     if (codec.codec_type != AVMEDIA_TYPE_DATA) {
1965         av_log(s, AV_LOG_WARNING, "Guessing on RTP content - if not received "
1966                                   "properly you need an SDP file "
1967                                   "describing it\n");
1968     }
1969
1970     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
1971                  NULL, 0, s->filename);
1972
1973     snprintf(sdp, sizeof(sdp),
1974              "v=0\r\nc=IN IP%d %s\r\nm=%s %d RTP/AVP %d\r\n",
1975              addr.ss_family == AF_INET ? 4 : 6, host,
1976              codec.codec_type == AVMEDIA_TYPE_DATA  ? "application" :
1977              codec.codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
1978              port, payload_type);
1979     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
1980
1981     ffio_init_context(&pb, sdp, strlen(sdp), 0, NULL, NULL, NULL, NULL);
1982     s->pb = &pb;
1983
1984     /* sdp_read_header initializes this again */
1985     ff_network_close();
1986
1987     ret = sdp_read_header(s, ap);
1988     s->pb = NULL;
1989     return ret;
1990
1991 fail:
1992     if (in)
1993         ffurl_close(in);
1994     ff_network_close();
1995     return ret;
1996 }
1997
1998 static const AVClass rtp_demuxer_class = {
1999     .class_name     = "RTP demuxer",
2000     .item_name      = av_default_item_name,
2001     .option         = rtp_options,
2002     .version        = LIBAVUTIL_VERSION_INT,
2003 };
2004
2005 AVInputFormat ff_rtp_demuxer = {
2006     .name           = "rtp",
2007     .long_name      = NULL_IF_CONFIG_SMALL("RTP input format"),
2008     .priv_data_size = sizeof(RTSPState),
2009     .read_probe     = rtp_probe,
2010     .read_header    = rtp_read_header,
2011     .read_packet    = ff_rtsp_fetch_packet,
2012     .read_close     = sdp_read_close,
2013     .flags = AVFMT_NOFILE,
2014     .priv_class     = &rtp_demuxer_class
2015 };
2016 #endif /* CONFIG_RTP_DEMUXER */
2017