libavformat/rtsp.c
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00001 /*
00002  * RTSP/SDP client
00003  * Copyright (c) 2002 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/base64.h"
00023 #include "libavutil/avstring.h"
00024 #include "libavutil/intreadwrite.h"
00025 #include "libavutil/mathematics.h"
00026 #include "libavutil/parseutils.h"
00027 #include "libavutil/random_seed.h"
00028 #include "libavutil/dict.h"
00029 #include "libavutil/opt.h"
00030 #include "avformat.h"
00031 #include "avio_internal.h"
00032 
00033 #include <sys/time.h>
00034 #if HAVE_POLL_H
00035 #include <poll.h>
00036 #endif
00037 #include "internal.h"
00038 #include "network.h"
00039 #include "os_support.h"
00040 #include "http.h"
00041 #include "rtsp.h"
00042 
00043 #include "rtpdec.h"
00044 #include "rdt.h"
00045 #include "rtpdec_formats.h"
00046 #include "rtpenc_chain.h"
00047 #include "url.h"
00048 #include "rtpenc.h"
00049 
00050 //#define DEBUG
00051 
00052 /* Timeout values for socket poll, in ms,
00053  * and read_packet(), in seconds  */
00054 #define POLL_TIMEOUT_MS 100
00055 #define READ_PACKET_TIMEOUT_S 10
00056 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / POLL_TIMEOUT_MS
00057 #define SDP_MAX_SIZE 16384
00058 #define RECVBUF_SIZE 10 * RTP_MAX_PACKET_LENGTH
00059 
00060 #define OFFSET(x) offsetof(RTSPState, x)
00061 #define DEC AV_OPT_FLAG_DECODING_PARAM
00062 #define ENC AV_OPT_FLAG_ENCODING_PARAM
00063 
00064 #define RTSP_FLAG_OPTS(name, longname) \
00065     { name, longname, OFFSET(rtsp_flags), AV_OPT_TYPE_FLAGS, {0}, INT_MIN, INT_MAX, DEC, "rtsp_flags" }, \
00066     { "filter_src", "Only receive packets from the negotiated peer IP", 0, AV_OPT_TYPE_CONST, {RTSP_FLAG_FILTER_SRC}, 0, 0, DEC, "rtsp_flags" }
00067 
00068 #define RTSP_MEDIATYPE_OPTS(name, longname) \
00069     { name, longname, OFFSET(media_type_mask), AV_OPT_TYPE_FLAGS, { (1 << (AVMEDIA_TYPE_DATA+1)) - 1 }, INT_MIN, INT_MAX, DEC, "allowed_media_types" }, \
00070     { "video", "Video", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_VIDEO}, 0, 0, DEC, "allowed_media_types" }, \
00071     { "audio", "Audio", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_AUDIO}, 0, 0, DEC, "allowed_media_types" }, \
00072     { "data", "Data", 0, AV_OPT_TYPE_CONST, {1 << AVMEDIA_TYPE_DATA}, 0, 0, DEC, "allowed_media_types" }
00073 
00074 const AVOption ff_rtsp_options[] = {
00075     { "initial_pause",  "Don't start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_INT, {0}, 0, 1, DEC },
00076     FF_RTP_FLAG_OPTS(RTSPState, rtp_muxer_flags),
00077     { "rtsp_transport", "RTSP transport protocols", OFFSET(lower_transport_mask), AV_OPT_TYPE_FLAGS, {0}, INT_MIN, INT_MAX, DEC|ENC, "rtsp_transport" }, \
00078     { "udp", "UDP", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_UDP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
00079     { "tcp", "TCP", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_TCP}, 0, 0, DEC|ENC, "rtsp_transport" }, \
00080     { "udp_multicast", "UDP multicast", 0, AV_OPT_TYPE_CONST, {1 << RTSP_LOWER_TRANSPORT_UDP_MULTICAST}, 0, 0, DEC, "rtsp_transport" },
00081     { "http", "HTTP tunneling", 0, AV_OPT_TYPE_CONST, {(1 << RTSP_LOWER_TRANSPORT_HTTP)}, 0, 0, DEC, "rtsp_transport" },
00082     RTSP_FLAG_OPTS("rtsp_flags", "RTSP flags"),
00083     RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
00084     { "min_port", "Minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
00085     { "max_port", "Maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
00086     { NULL },
00087 };
00088 
00089 static const AVOption sdp_options[] = {
00090     RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
00091     RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
00092     { NULL },
00093 };
00094 
00095 static const AVOption rtp_options[] = {
00096     RTSP_FLAG_OPTS("rtp_flags", "RTP flags"),
00097     { NULL },
00098 };
00099 
00100 static void get_word_until_chars(char *buf, int buf_size,
00101                                  const char *sep, const char **pp)
00102 {
00103     const char *p;
00104     char *q;
00105 
00106     p = *pp;
00107     p += strspn(p, SPACE_CHARS);
00108     q = buf;
00109     while (!strchr(sep, *p) && *p != '\0') {
00110         if ((q - buf) < buf_size - 1)
00111             *q++ = *p;
00112         p++;
00113     }
00114     if (buf_size > 0)
00115         *q = '\0';
00116     *pp = p;
00117 }
00118 
00119 static void get_word_sep(char *buf, int buf_size, const char *sep,
00120                          const char **pp)
00121 {
00122     if (**pp == '/') (*pp)++;
00123     get_word_until_chars(buf, buf_size, sep, pp);
00124 }
00125 
00126 static void get_word(char *buf, int buf_size, const char **pp)
00127 {
00128     get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
00129 }
00130 
00135 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
00136 {
00137     char buf[256];
00138 
00139     p += strspn(p, SPACE_CHARS);
00140     if (!av_stristart(p, "npt=", &p))
00141         return;
00142 
00143     *start = AV_NOPTS_VALUE;
00144     *end = AV_NOPTS_VALUE;
00145 
00146     get_word_sep(buf, sizeof(buf), "-", &p);
00147     av_parse_time(start, buf, 1);
00148     if (*p == '-') {
00149         p++;
00150         get_word_sep(buf, sizeof(buf), "-", &p);
00151         av_parse_time(end, buf, 1);
00152     }
00153 //    av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
00154 //    av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
00155 }
00156 
00157 static int get_sockaddr(const char *buf, struct sockaddr_storage *sock)
00158 {
00159     struct addrinfo hints, *ai = NULL;
00160     memset(&hints, 0, sizeof(hints));
00161     hints.ai_flags = AI_NUMERICHOST;
00162     if (getaddrinfo(buf, NULL, &hints, &ai))
00163         return -1;
00164     memcpy(sock, ai->ai_addr, FFMIN(sizeof(*sock), ai->ai_addrlen));
00165     freeaddrinfo(ai);
00166     return 0;
00167 }
00168 
00169 #if CONFIG_RTPDEC
00170 static void init_rtp_handler(RTPDynamicProtocolHandler *handler,
00171                              RTSPStream *rtsp_st, AVCodecContext *codec)
00172 {
00173     if (!handler)
00174         return;
00175     codec->codec_id          = handler->codec_id;
00176     rtsp_st->dynamic_handler = handler;
00177     if (handler->alloc) {
00178         rtsp_st->dynamic_protocol_context = handler->alloc();
00179         if (!rtsp_st->dynamic_protocol_context)
00180             rtsp_st->dynamic_handler = NULL;
00181     }
00182 }
00183 
00184 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
00185 static int sdp_parse_rtpmap(AVFormatContext *s,
00186                             AVStream *st, RTSPStream *rtsp_st,
00187                             int payload_type, const char *p)
00188 {
00189     AVCodecContext *codec = st->codec;
00190     char buf[256];
00191     int i;
00192     AVCodec *c;
00193     const char *c_name;
00194 
00195     /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
00196      * see if we can handle this kind of payload.
00197      * The space should normally not be there but some Real streams or
00198      * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
00199      * have a trailing space. */
00200     get_word_sep(buf, sizeof(buf), "/ ", &p);
00201     if (payload_type >= RTP_PT_PRIVATE) {
00202         RTPDynamicProtocolHandler *handler =
00203             ff_rtp_handler_find_by_name(buf, codec->codec_type);
00204         init_rtp_handler(handler, rtsp_st, codec);
00205         /* If no dynamic handler was found, check with the list of standard
00206          * allocated types, if such a stream for some reason happens to
00207          * use a private payload type. This isn't handled in rtpdec.c, since
00208          * the format name from the rtpmap line never is passed into rtpdec. */
00209         if (!rtsp_st->dynamic_handler)
00210             codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
00211     } else {
00212         /* We are in a standard case
00213          * (from http://www.iana.org/assignments/rtp-parameters). */
00214         /* search into AVRtpPayloadTypes[] */
00215         codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
00216     }
00217 
00218     c = avcodec_find_decoder(codec->codec_id);
00219     if (c && c->name)
00220         c_name = c->name;
00221     else
00222         c_name = "(null)";
00223 
00224     get_word_sep(buf, sizeof(buf), "/", &p);
00225     i = atoi(buf);
00226     switch (codec->codec_type) {
00227     case AVMEDIA_TYPE_AUDIO:
00228         av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
00229         codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
00230         codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
00231         if (i > 0) {
00232             codec->sample_rate = i;
00233             avpriv_set_pts_info(st, 32, 1, codec->sample_rate);
00234             get_word_sep(buf, sizeof(buf), "/", &p);
00235             i = atoi(buf);
00236             if (i > 0)
00237                 codec->channels = i;
00238             // TODO: there is a bug here; if it is a mono stream, and
00239             // less than 22000Hz, faad upconverts to stereo and twice
00240             // the frequency.  No problem, but the sample rate is being
00241             // set here by the sdp line. Patch on its way. (rdm)
00242         }
00243         av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
00244                codec->sample_rate);
00245         av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
00246                codec->channels);
00247         break;
00248     case AVMEDIA_TYPE_VIDEO:
00249         av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
00250         if (i > 0)
00251             avpriv_set_pts_info(st, 32, 1, i);
00252         break;
00253     default:
00254         break;
00255     }
00256     if (rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->init)
00257         rtsp_st->dynamic_handler->init(s, st->index,
00258                                        rtsp_st->dynamic_protocol_context);
00259     return 0;
00260 }
00261 
00262 /* parse the attribute line from the fmtp a line of an sdp response. This
00263  * is broken out as a function because it is used in rtp_h264.c, which is
00264  * forthcoming. */
00265 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
00266                                 char *value, int value_size)
00267 {
00268     *p += strspn(*p, SPACE_CHARS);
00269     if (**p) {
00270         get_word_sep(attr, attr_size, "=", p);
00271         if (**p == '=')
00272             (*p)++;
00273         get_word_sep(value, value_size, ";", p);
00274         if (**p == ';')
00275             (*p)++;
00276         return 1;
00277     }
00278     return 0;
00279 }
00280 
00281 typedef struct SDPParseState {
00282     /* SDP only */
00283     struct sockaddr_storage default_ip;
00284     int            default_ttl;
00285     int            skip_media;  
00286 } SDPParseState;
00287 
00288 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
00289                            int letter, const char *buf)
00290 {
00291     RTSPState *rt = s->priv_data;
00292     char buf1[64], st_type[64];
00293     const char *p;
00294     enum AVMediaType codec_type;
00295     int payload_type, i;
00296     AVStream *st;
00297     RTSPStream *rtsp_st;
00298     struct sockaddr_storage sdp_ip;
00299     int ttl;
00300 
00301     av_dlog(s, "sdp: %c='%s'\n", letter, buf);
00302 
00303     p = buf;
00304     if (s1->skip_media && letter != 'm')
00305         return;
00306     switch (letter) {
00307     case 'c':
00308         get_word(buf1, sizeof(buf1), &p);
00309         if (strcmp(buf1, "IN") != 0)
00310             return;
00311         get_word(buf1, sizeof(buf1), &p);
00312         if (strcmp(buf1, "IP4") && strcmp(buf1, "IP6"))
00313             return;
00314         get_word_sep(buf1, sizeof(buf1), "/", &p);
00315         if (get_sockaddr(buf1, &sdp_ip))
00316             return;
00317         ttl = 16;
00318         if (*p == '/') {
00319             p++;
00320             get_word_sep(buf1, sizeof(buf1), "/", &p);
00321             ttl = atoi(buf1);
00322         }
00323         if (s->nb_streams == 0) {
00324             s1->default_ip = sdp_ip;
00325             s1->default_ttl = ttl;
00326         } else {
00327             rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
00328             rtsp_st->sdp_ip = sdp_ip;
00329             rtsp_st->sdp_ttl = ttl;
00330         }
00331         break;
00332     case 's':
00333         av_dict_set(&s->metadata, "title", p, 0);
00334         break;
00335     case 'i':
00336         if (s->nb_streams == 0) {
00337             av_dict_set(&s->metadata, "comment", p, 0);
00338             break;
00339         }
00340         break;
00341     case 'm':
00342         /* new stream */
00343         s1->skip_media = 0;
00344         codec_type = AVMEDIA_TYPE_UNKNOWN;
00345         get_word(st_type, sizeof(st_type), &p);
00346         if (!strcmp(st_type, "audio")) {
00347             codec_type = AVMEDIA_TYPE_AUDIO;
00348         } else if (!strcmp(st_type, "video")) {
00349             codec_type = AVMEDIA_TYPE_VIDEO;
00350         } else if (!strcmp(st_type, "application")) {
00351             codec_type = AVMEDIA_TYPE_DATA;
00352         }
00353         if (codec_type == AVMEDIA_TYPE_UNKNOWN || !(rt->media_type_mask & (1 << codec_type))) {
00354             s1->skip_media = 1;
00355             return;
00356         }
00357         rtsp_st = av_mallocz(sizeof(RTSPStream));
00358         if (!rtsp_st)
00359             return;
00360         rtsp_st->stream_index = -1;
00361         dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
00362 
00363         rtsp_st->sdp_ip = s1->default_ip;
00364         rtsp_st->sdp_ttl = s1->default_ttl;
00365 
00366         get_word(buf1, sizeof(buf1), &p); /* port */
00367         rtsp_st->sdp_port = atoi(buf1);
00368 
00369         get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
00370 
00371         /* XXX: handle list of formats */
00372         get_word(buf1, sizeof(buf1), &p); /* format list */
00373         rtsp_st->sdp_payload_type = atoi(buf1);
00374 
00375         if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
00376             /* no corresponding stream */
00377         } else {
00378             st = avformat_new_stream(s, NULL);
00379             if (!st)
00380                 return;
00381             st->id = rt->nb_rtsp_streams - 1;
00382             rtsp_st->stream_index = st->index;
00383             st->codec->codec_type = codec_type;
00384             if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
00385                 RTPDynamicProtocolHandler *handler;
00386                 /* if standard payload type, we can find the codec right now */
00387                 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
00388                 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
00389                     st->codec->sample_rate > 0)
00390                     avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
00391                 /* Even static payload types may need a custom depacketizer */
00392                 handler = ff_rtp_handler_find_by_id(
00393                               rtsp_st->sdp_payload_type, st->codec->codec_type);
00394                 init_rtp_handler(handler, rtsp_st, st->codec);
00395                 if (handler && handler->init)
00396                     handler->init(s, st->index,
00397                                   rtsp_st->dynamic_protocol_context);
00398             }
00399         }
00400         /* put a default control url */
00401         av_strlcpy(rtsp_st->control_url, rt->control_uri,
00402                    sizeof(rtsp_st->control_url));
00403         break;
00404     case 'a':
00405         if (av_strstart(p, "control:", &p)) {
00406             if (s->nb_streams == 0) {
00407                 if (!strncmp(p, "rtsp://", 7))
00408                     av_strlcpy(rt->control_uri, p,
00409                                sizeof(rt->control_uri));
00410             } else {
00411                 char proto[32];
00412                 /* get the control url */
00413                 rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
00414 
00415                 /* XXX: may need to add full url resolution */
00416                 av_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
00417                              NULL, NULL, 0, p);
00418                 if (proto[0] == '\0') {
00419                     /* relative control URL */
00420                     if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
00421                     av_strlcat(rtsp_st->control_url, "/",
00422                                sizeof(rtsp_st->control_url));
00423                     av_strlcat(rtsp_st->control_url, p,
00424                                sizeof(rtsp_st->control_url));
00425                 } else
00426                     av_strlcpy(rtsp_st->control_url, p,
00427                                sizeof(rtsp_st->control_url));
00428             }
00429         } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
00430             /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
00431             get_word(buf1, sizeof(buf1), &p);
00432             payload_type = atoi(buf1);
00433             st = s->streams[s->nb_streams - 1];
00434             rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
00435             sdp_parse_rtpmap(s, st, rtsp_st, payload_type, p);
00436         } else if (av_strstart(p, "fmtp:", &p) ||
00437                    av_strstart(p, "framesize:", &p)) {
00438             /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
00439             // let dynamic protocol handlers have a stab at the line.
00440             get_word(buf1, sizeof(buf1), &p);
00441             payload_type = atoi(buf1);
00442             for (i = 0; i < rt->nb_rtsp_streams; i++) {
00443                 rtsp_st = rt->rtsp_streams[i];
00444                 if (rtsp_st->sdp_payload_type == payload_type &&
00445                     rtsp_st->dynamic_handler &&
00446                     rtsp_st->dynamic_handler->parse_sdp_a_line)
00447                     rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
00448                         rtsp_st->dynamic_protocol_context, buf);
00449             }
00450         } else if (av_strstart(p, "range:", &p)) {
00451             int64_t start, end;
00452 
00453             // this is so that seeking on a streamed file can work.
00454             rtsp_parse_range_npt(p, &start, &end);
00455             s->start_time = start;
00456             /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
00457             s->duration   = (end == AV_NOPTS_VALUE) ?
00458                             AV_NOPTS_VALUE : end - start;
00459         } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
00460             if (atoi(p) == 1)
00461                 rt->transport = RTSP_TRANSPORT_RDT;
00462         } else if (av_strstart(p, "SampleRate:integer;", &p) &&
00463                    s->nb_streams > 0) {
00464             st = s->streams[s->nb_streams - 1];
00465             st->codec->sample_rate = atoi(p);
00466         } else {
00467             if (rt->server_type == RTSP_SERVER_WMS)
00468                 ff_wms_parse_sdp_a_line(s, p);
00469             if (s->nb_streams > 0) {
00470                 if (rt->server_type == RTSP_SERVER_REAL)
00471                     ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
00472 
00473                 rtsp_st = rt->rtsp_streams[rt->nb_rtsp_streams - 1];
00474                 if (rtsp_st->dynamic_handler &&
00475                     rtsp_st->dynamic_handler->parse_sdp_a_line)
00476                     rtsp_st->dynamic_handler->parse_sdp_a_line(s,
00477                         s->nb_streams - 1,
00478                         rtsp_st->dynamic_protocol_context, buf);
00479             }
00480         }
00481         break;
00482     }
00483 }
00484 
00485 int ff_sdp_parse(AVFormatContext *s, const char *content)
00486 {
00487     RTSPState *rt = s->priv_data;
00488     const char *p;
00489     int letter;
00490     /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
00491      * contain long SDP lines containing complete ASF Headers (several
00492      * kB) or arrays of MDPR (RM stream descriptor) headers plus
00493      * "rulebooks" describing their properties. Therefore, the SDP line
00494      * buffer is large.
00495      *
00496      * The Vorbis FMTP line can be up to 16KB - see xiph_parse_sdp_line
00497      * in rtpdec_xiph.c. */
00498     char buf[16384], *q;
00499     SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
00500 
00501     memset(s1, 0, sizeof(SDPParseState));
00502     p = content;
00503     for (;;) {
00504         p += strspn(p, SPACE_CHARS);
00505         letter = *p;
00506         if (letter == '\0')
00507             break;
00508         p++;
00509         if (*p != '=')
00510             goto next_line;
00511         p++;
00512         /* get the content */
00513         q = buf;
00514         while (*p != '\n' && *p != '\r' && *p != '\0') {
00515             if ((q - buf) < sizeof(buf) - 1)
00516                 *q++ = *p;
00517             p++;
00518         }
00519         *q = '\0';
00520         sdp_parse_line(s, s1, letter, buf);
00521     next_line:
00522         while (*p != '\n' && *p != '\0')
00523             p++;
00524         if (*p == '\n')
00525             p++;
00526     }
00527     rt->p = av_malloc(sizeof(struct pollfd)*2*(rt->nb_rtsp_streams+1));
00528     if (!rt->p) return AVERROR(ENOMEM);
00529     return 0;
00530 }
00531 #endif /* CONFIG_RTPDEC */
00532 
00533 void ff_rtsp_undo_setup(AVFormatContext *s)
00534 {
00535     RTSPState *rt = s->priv_data;
00536     int i;
00537 
00538     for (i = 0; i < rt->nb_rtsp_streams; i++) {
00539         RTSPStream *rtsp_st = rt->rtsp_streams[i];
00540         if (!rtsp_st)
00541             continue;
00542         if (rtsp_st->transport_priv) {
00543             if (s->oformat) {
00544                 AVFormatContext *rtpctx = rtsp_st->transport_priv;
00545                 av_write_trailer(rtpctx);
00546                 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
00547                     uint8_t *ptr;
00548                     avio_close_dyn_buf(rtpctx->pb, &ptr);
00549                     av_free(ptr);
00550                 } else {
00551                     avio_close(rtpctx->pb);
00552                 }
00553                 avformat_free_context(rtpctx);
00554             } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
00555                 ff_rdt_parse_close(rtsp_st->transport_priv);
00556             else if (CONFIG_RTPDEC)
00557                 ff_rtp_parse_close(rtsp_st->transport_priv);
00558         }
00559         rtsp_st->transport_priv = NULL;
00560         if (rtsp_st->rtp_handle)
00561             ffurl_close(rtsp_st->rtp_handle);
00562         rtsp_st->rtp_handle = NULL;
00563     }
00564 }
00565 
00566 /* close and free RTSP streams */
00567 void ff_rtsp_close_streams(AVFormatContext *s)
00568 {
00569     RTSPState *rt = s->priv_data;
00570     int i;
00571     RTSPStream *rtsp_st;
00572 
00573     ff_rtsp_undo_setup(s);
00574     for (i = 0; i < rt->nb_rtsp_streams; i++) {
00575         rtsp_st = rt->rtsp_streams[i];
00576         if (rtsp_st) {
00577             if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
00578                 rtsp_st->dynamic_handler->free(
00579                     rtsp_st->dynamic_protocol_context);
00580             av_free(rtsp_st);
00581         }
00582     }
00583     av_free(rt->rtsp_streams);
00584     if (rt->asf_ctx) {
00585         avformat_close_input(&rt->asf_ctx);
00586     }
00587     av_free(rt->p);
00588     av_free(rt->recvbuf);
00589 }
00590 
00591 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
00592 {
00593     RTSPState *rt = s->priv_data;
00594     AVStream *st = NULL;
00595 
00596     /* open the RTP context */
00597     if (rtsp_st->stream_index >= 0)
00598         st = s->streams[rtsp_st->stream_index];
00599     if (!st)
00600         s->ctx_flags |= AVFMTCTX_NOHEADER;
00601 
00602     if (s->oformat && CONFIG_RTSP_MUXER) {
00603         rtsp_st->transport_priv = ff_rtp_chain_mux_open(s, st,
00604                                       rtsp_st->rtp_handle,
00605                                       RTSP_TCP_MAX_PACKET_SIZE);
00606         /* Ownership of rtp_handle is passed to the rtp mux context */
00607         rtsp_st->rtp_handle = NULL;
00608     } else if (rt->transport == RTSP_TRANSPORT_RDT && CONFIG_RTPDEC)
00609         rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
00610                                             rtsp_st->dynamic_protocol_context,
00611                                             rtsp_st->dynamic_handler);
00612     else if (CONFIG_RTPDEC)
00613         rtsp_st->transport_priv = ff_rtp_parse_open(s, st, rtsp_st->rtp_handle,
00614                                          rtsp_st->sdp_payload_type,
00615             (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP || !s->max_delay)
00616             ? 0 : RTP_REORDER_QUEUE_DEFAULT_SIZE);
00617 
00618     if (!rtsp_st->transport_priv) {
00619          return AVERROR(ENOMEM);
00620     } else if (rt->transport != RTSP_TRANSPORT_RDT && CONFIG_RTPDEC) {
00621         if (rtsp_st->dynamic_handler) {
00622             ff_rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
00623                                               rtsp_st->dynamic_protocol_context,
00624                                               rtsp_st->dynamic_handler);
00625         }
00626     }
00627 
00628     return 0;
00629 }
00630 
00631 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
00632 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
00633 {
00634     const char *p;
00635     int v;
00636 
00637     p = *pp;
00638     p += strspn(p, SPACE_CHARS);
00639     v = strtol(p, (char **)&p, 10);
00640     if (*p == '-') {
00641         p++;
00642         *min_ptr = v;
00643         v = strtol(p, (char **)&p, 10);
00644         *max_ptr = v;
00645     } else {
00646         *min_ptr = v;
00647         *max_ptr = v;
00648     }
00649     *pp = p;
00650 }
00651 
00652 /* XXX: only one transport specification is parsed */
00653 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
00654 {
00655     char transport_protocol[16];
00656     char profile[16];
00657     char lower_transport[16];
00658     char parameter[16];
00659     RTSPTransportField *th;
00660     char buf[256];
00661 
00662     reply->nb_transports = 0;
00663 
00664     for (;;) {
00665         p += strspn(p, SPACE_CHARS);
00666         if (*p == '\0')
00667             break;
00668 
00669         th = &reply->transports[reply->nb_transports];
00670 
00671         get_word_sep(transport_protocol, sizeof(transport_protocol),
00672                      "/", &p);
00673         if (!av_strcasecmp (transport_protocol, "rtp")) {
00674             get_word_sep(profile, sizeof(profile), "/;,", &p);
00675             lower_transport[0] = '\0';
00676             /* rtp/avp/<protocol> */
00677             if (*p == '/') {
00678                 get_word_sep(lower_transport, sizeof(lower_transport),
00679                              ";,", &p);
00680             }
00681             th->transport = RTSP_TRANSPORT_RTP;
00682         } else if (!av_strcasecmp (transport_protocol, "x-pn-tng") ||
00683                    !av_strcasecmp (transport_protocol, "x-real-rdt")) {
00684             /* x-pn-tng/<protocol> */
00685             get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
00686             profile[0] = '\0';
00687             th->transport = RTSP_TRANSPORT_RDT;
00688         }
00689         if (!av_strcasecmp(lower_transport, "TCP"))
00690             th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
00691         else
00692             th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
00693 
00694         if (*p == ';')
00695             p++;
00696         /* get each parameter */
00697         while (*p != '\0' && *p != ',') {
00698             get_word_sep(parameter, sizeof(parameter), "=;,", &p);
00699             if (!strcmp(parameter, "port")) {
00700                 if (*p == '=') {
00701                     p++;
00702                     rtsp_parse_range(&th->port_min, &th->port_max, &p);
00703                 }
00704             } else if (!strcmp(parameter, "client_port")) {
00705                 if (*p == '=') {
00706                     p++;
00707                     rtsp_parse_range(&th->client_port_min,
00708                                      &th->client_port_max, &p);
00709                 }
00710             } else if (!strcmp(parameter, "server_port")) {
00711                 if (*p == '=') {
00712                     p++;
00713                     rtsp_parse_range(&th->server_port_min,
00714                                      &th->server_port_max, &p);
00715                 }
00716             } else if (!strcmp(parameter, "interleaved")) {
00717                 if (*p == '=') {
00718                     p++;
00719                     rtsp_parse_range(&th->interleaved_min,
00720                                      &th->interleaved_max, &p);
00721                 }
00722             } else if (!strcmp(parameter, "multicast")) {
00723                 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
00724                     th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
00725             } else if (!strcmp(parameter, "ttl")) {
00726                 if (*p == '=') {
00727                     p++;
00728                     th->ttl = strtol(p, (char **)&p, 10);
00729                 }
00730             } else if (!strcmp(parameter, "destination")) {
00731                 if (*p == '=') {
00732                     p++;
00733                     get_word_sep(buf, sizeof(buf), ";,", &p);
00734                     get_sockaddr(buf, &th->destination);
00735                 }
00736             } else if (!strcmp(parameter, "source")) {
00737                 if (*p == '=') {
00738                     p++;
00739                     get_word_sep(buf, sizeof(buf), ";,", &p);
00740                     av_strlcpy(th->source, buf, sizeof(th->source));
00741                 }
00742             }
00743 
00744             while (*p != ';' && *p != '\0' && *p != ',')
00745                 p++;
00746             if (*p == ';')
00747                 p++;
00748         }
00749         if (*p == ',')
00750             p++;
00751 
00752         reply->nb_transports++;
00753     }
00754 }
00755 
00756 static void handle_rtp_info(RTSPState *rt, const char *url,
00757                             uint32_t seq, uint32_t rtptime)
00758 {
00759     int i;
00760     if (!rtptime || !url[0])
00761         return;
00762     if (rt->transport != RTSP_TRANSPORT_RTP)
00763         return;
00764     for (i = 0; i < rt->nb_rtsp_streams; i++) {
00765         RTSPStream *rtsp_st = rt->rtsp_streams[i];
00766         RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
00767         if (!rtpctx)
00768             continue;
00769         if (!strcmp(rtsp_st->control_url, url)) {
00770             rtpctx->base_timestamp = rtptime;
00771             break;
00772         }
00773     }
00774 }
00775 
00776 static void rtsp_parse_rtp_info(RTSPState *rt, const char *p)
00777 {
00778     int read = 0;
00779     char key[20], value[1024], url[1024] = "";
00780     uint32_t seq = 0, rtptime = 0;
00781 
00782     for (;;) {
00783         p += strspn(p, SPACE_CHARS);
00784         if (!*p)
00785             break;
00786         get_word_sep(key, sizeof(key), "=", &p);
00787         if (*p != '=')
00788             break;
00789         p++;
00790         get_word_sep(value, sizeof(value), ";, ", &p);
00791         read++;
00792         if (!strcmp(key, "url"))
00793             av_strlcpy(url, value, sizeof(url));
00794         else if (!strcmp(key, "seq"))
00795             seq = strtoul(value, NULL, 10);
00796         else if (!strcmp(key, "rtptime"))
00797             rtptime = strtoul(value, NULL, 10);
00798         if (*p == ',') {
00799             handle_rtp_info(rt, url, seq, rtptime);
00800             url[0] = '\0';
00801             seq = rtptime = 0;
00802             read = 0;
00803         }
00804         if (*p)
00805             p++;
00806     }
00807     if (read > 0)
00808         handle_rtp_info(rt, url, seq, rtptime);
00809 }
00810 
00811 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
00812                         RTSPState *rt, const char *method)
00813 {
00814     const char *p;
00815 
00816     /* NOTE: we do case independent match for broken servers */
00817     p = buf;
00818     if (av_stristart(p, "Session:", &p)) {
00819         int t;
00820         get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
00821         if (av_stristart(p, ";timeout=", &p) &&
00822             (t = strtol(p, NULL, 10)) > 0) {
00823             reply->timeout = t;
00824         }
00825     } else if (av_stristart(p, "Content-Length:", &p)) {
00826         reply->content_length = strtol(p, NULL, 10);
00827     } else if (av_stristart(p, "Transport:", &p)) {
00828         rtsp_parse_transport(reply, p);
00829     } else if (av_stristart(p, "CSeq:", &p)) {
00830         reply->seq = strtol(p, NULL, 10);
00831     } else if (av_stristart(p, "Range:", &p)) {
00832         rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
00833     } else if (av_stristart(p, "RealChallenge1:", &p)) {
00834         p += strspn(p, SPACE_CHARS);
00835         av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
00836     } else if (av_stristart(p, "Server:", &p)) {
00837         p += strspn(p, SPACE_CHARS);
00838         av_strlcpy(reply->server, p, sizeof(reply->server));
00839     } else if (av_stristart(p, "Notice:", &p) ||
00840                av_stristart(p, "X-Notice:", &p)) {
00841         reply->notice = strtol(p, NULL, 10);
00842     } else if (av_stristart(p, "Location:", &p)) {
00843         p += strspn(p, SPACE_CHARS);
00844         av_strlcpy(reply->location, p , sizeof(reply->location));
00845     } else if (av_stristart(p, "WWW-Authenticate:", &p) && rt) {
00846         p += strspn(p, SPACE_CHARS);
00847         ff_http_auth_handle_header(&rt->auth_state, "WWW-Authenticate", p);
00848     } else if (av_stristart(p, "Authentication-Info:", &p) && rt) {
00849         p += strspn(p, SPACE_CHARS);
00850         ff_http_auth_handle_header(&rt->auth_state, "Authentication-Info", p);
00851     } else if (av_stristart(p, "Content-Base:", &p) && rt) {
00852         p += strspn(p, SPACE_CHARS);
00853         if (method && !strcmp(method, "DESCRIBE"))
00854             av_strlcpy(rt->control_uri, p , sizeof(rt->control_uri));
00855     } else if (av_stristart(p, "RTP-Info:", &p) && rt) {
00856         p += strspn(p, SPACE_CHARS);
00857         if (method && !strcmp(method, "PLAY"))
00858             rtsp_parse_rtp_info(rt, p);
00859     } else if (av_stristart(p, "Public:", &p) && rt) {
00860         if (strstr(p, "GET_PARAMETER") &&
00861             method && !strcmp(method, "OPTIONS"))
00862             rt->get_parameter_supported = 1;
00863     } else if (av_stristart(p, "x-Accept-Dynamic-Rate:", &p) && rt) {
00864         p += strspn(p, SPACE_CHARS);
00865         rt->accept_dynamic_rate = atoi(p);
00866     }
00867 }
00868 
00869 /* skip a RTP/TCP interleaved packet */
00870 void ff_rtsp_skip_packet(AVFormatContext *s)
00871 {
00872     RTSPState *rt = s->priv_data;
00873     int ret, len, len1;
00874     uint8_t buf[1024];
00875 
00876     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
00877     if (ret != 3)
00878         return;
00879     len = AV_RB16(buf + 1);
00880 
00881     av_dlog(s, "skipping RTP packet len=%d\n", len);
00882 
00883     /* skip payload */
00884     while (len > 0) {
00885         len1 = len;
00886         if (len1 > sizeof(buf))
00887             len1 = sizeof(buf);
00888         ret = ffurl_read_complete(rt->rtsp_hd, buf, len1);
00889         if (ret != len1)
00890             return;
00891         len -= len1;
00892     }
00893 }
00894 
00895 int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
00896                        unsigned char **content_ptr,
00897                        int return_on_interleaved_data, const char *method)
00898 {
00899     RTSPState *rt = s->priv_data;
00900     char buf[4096], buf1[1024], *q;
00901     unsigned char ch;
00902     const char *p;
00903     int ret, content_length, line_count = 0;
00904     unsigned char *content = NULL;
00905 
00906     memset(reply, 0, sizeof(*reply));
00907 
00908     /* parse reply (XXX: use buffers) */
00909     rt->last_reply[0] = '\0';
00910     for (;;) {
00911         q = buf;
00912         for (;;) {
00913             ret = ffurl_read_complete(rt->rtsp_hd, &ch, 1);
00914             av_dlog(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
00915             if (ret != 1)
00916                 return AVERROR_EOF;
00917             if (ch == '\n')
00918                 break;
00919             if (ch == '$') {
00920                 /* XXX: only parse it if first char on line ? */
00921                 if (return_on_interleaved_data) {
00922                     return 1;
00923                 } else
00924                     ff_rtsp_skip_packet(s);
00925             } else if (ch != '\r') {
00926                 if ((q - buf) < sizeof(buf) - 1)
00927                     *q++ = ch;
00928             }
00929         }
00930         *q = '\0';
00931 
00932         av_dlog(s, "line='%s'\n", buf);
00933 
00934         /* test if last line */
00935         if (buf[0] == '\0')
00936             break;
00937         p = buf;
00938         if (line_count == 0) {
00939             /* get reply code */
00940             get_word(buf1, sizeof(buf1), &p);
00941             get_word(buf1, sizeof(buf1), &p);
00942             reply->status_code = atoi(buf1);
00943             av_strlcpy(reply->reason, p, sizeof(reply->reason));
00944         } else {
00945             ff_rtsp_parse_line(reply, p, rt, method);
00946             av_strlcat(rt->last_reply, p,    sizeof(rt->last_reply));
00947             av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
00948         }
00949         line_count++;
00950     }
00951 
00952     if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
00953         av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
00954 
00955     content_length = reply->content_length;
00956     if (content_length > 0) {
00957         /* leave some room for a trailing '\0' (useful for simple parsing) */
00958         content = av_malloc(content_length + 1);
00959         ffurl_read_complete(rt->rtsp_hd, content, content_length);
00960         content[content_length] = '\0';
00961     }
00962     if (content_ptr)
00963         *content_ptr = content;
00964     else
00965         av_free(content);
00966 
00967     if (rt->seq != reply->seq) {
00968         av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
00969             rt->seq, reply->seq);
00970     }
00971 
00972     /* EOS */
00973     if (reply->notice == 2101 /* End-of-Stream Reached */      ||
00974         reply->notice == 2104 /* Start-of-Stream Reached */    ||
00975         reply->notice == 2306 /* Continuous Feed Terminated */) {
00976         rt->state = RTSP_STATE_IDLE;
00977     } else if (reply->notice >= 4400 && reply->notice < 5500) {
00978         return AVERROR(EIO); /* data or server error */
00979     } else if (reply->notice == 2401 /* Ticket Expired */ ||
00980              (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
00981         return AVERROR(EPERM);
00982 
00983     return 0;
00984 }
00985 
00999 static int ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
01000                                                const char *method, const char *url,
01001                                                const char *headers,
01002                                                const unsigned char *send_content,
01003                                                int send_content_length)
01004 {
01005     RTSPState *rt = s->priv_data;
01006     char buf[4096], *out_buf;
01007     char base64buf[AV_BASE64_SIZE(sizeof(buf))];
01008 
01009     /* Add in RTSP headers */
01010     out_buf = buf;
01011     rt->seq++;
01012     snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
01013     if (headers)
01014         av_strlcat(buf, headers, sizeof(buf));
01015     av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
01016     if (rt->session_id[0] != '\0' && (!headers ||
01017         !strstr(headers, "\nIf-Match:"))) {
01018         av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
01019     }
01020     if (rt->auth[0]) {
01021         char *str = ff_http_auth_create_response(&rt->auth_state,
01022                                                  rt->auth, url, method);
01023         if (str)
01024             av_strlcat(buf, str, sizeof(buf));
01025         av_free(str);
01026     }
01027     if (send_content_length > 0 && send_content)
01028         av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
01029     av_strlcat(buf, "\r\n", sizeof(buf));
01030 
01031     /* base64 encode rtsp if tunneling */
01032     if (rt->control_transport == RTSP_MODE_TUNNEL) {
01033         av_base64_encode(base64buf, sizeof(base64buf), buf, strlen(buf));
01034         out_buf = base64buf;
01035     }
01036 
01037     av_dlog(s, "Sending:\n%s--\n", buf);
01038 
01039     ffurl_write(rt->rtsp_hd_out, out_buf, strlen(out_buf));
01040     if (send_content_length > 0 && send_content) {
01041         if (rt->control_transport == RTSP_MODE_TUNNEL) {
01042             av_log(s, AV_LOG_ERROR, "tunneling of RTSP requests "
01043                                     "with content data not supported\n");
01044             return AVERROR_PATCHWELCOME;
01045         }
01046         ffurl_write(rt->rtsp_hd_out, send_content, send_content_length);
01047     }
01048     rt->last_cmd_time = av_gettime();
01049 
01050     return 0;
01051 }
01052 
01053 int ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
01054                            const char *url, const char *headers)
01055 {
01056     return ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
01057 }
01058 
01059 int ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
01060                      const char *headers, RTSPMessageHeader *reply,
01061                      unsigned char **content_ptr)
01062 {
01063     return ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
01064                                          content_ptr, NULL, 0);
01065 }
01066 
01067 int ff_rtsp_send_cmd_with_content(AVFormatContext *s,
01068                                   const char *method, const char *url,
01069                                   const char *header,
01070                                   RTSPMessageHeader *reply,
01071                                   unsigned char **content_ptr,
01072                                   const unsigned char *send_content,
01073                                   int send_content_length)
01074 {
01075     RTSPState *rt = s->priv_data;
01076     HTTPAuthType cur_auth_type;
01077     int ret;
01078 
01079 retry:
01080     cur_auth_type = rt->auth_state.auth_type;
01081     if ((ret = ff_rtsp_send_cmd_with_content_async(s, method, url, header,
01082                                                    send_content,
01083                                                    send_content_length)))
01084         return ret;
01085 
01086     if ((ret = ff_rtsp_read_reply(s, reply, content_ptr, 0, method) ) < 0)
01087         return ret;
01088 
01089     if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
01090         rt->auth_state.auth_type != HTTP_AUTH_NONE)
01091         goto retry;
01092 
01093     if (reply->status_code > 400){
01094         av_log(s, AV_LOG_ERROR, "method %s failed: %d%s\n",
01095                method,
01096                reply->status_code,
01097                reply->reason);
01098         av_log(s, AV_LOG_DEBUG, "%s\n", rt->last_reply);
01099     }
01100 
01101     return 0;
01102 }
01103 
01104 int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
01105                               int lower_transport, const char *real_challenge)
01106 {
01107     RTSPState *rt = s->priv_data;
01108     int rtx = 0, j, i, err, interleave = 0, port_off;
01109     RTSPStream *rtsp_st;
01110     RTSPMessageHeader reply1, *reply = &reply1;
01111     char cmd[2048];
01112     const char *trans_pref;
01113 
01114     if (rt->transport == RTSP_TRANSPORT_RDT)
01115         trans_pref = "x-pn-tng";
01116     else
01117         trans_pref = "RTP/AVP";
01118 
01119     /* default timeout: 1 minute */
01120     rt->timeout = 60;
01121 
01122     /* Choose a random starting offset within the first half of the
01123      * port range, to allow for a number of ports to try even if the offset
01124      * happens to be at the end of the random range. */
01125     port_off = av_get_random_seed() % ((rt->rtp_port_max - rt->rtp_port_min)/2);
01126     /* even random offset */
01127     port_off -= port_off & 0x01;
01128 
01129     for (j = rt->rtp_port_min + port_off, i = 0; i < rt->nb_rtsp_streams; ++i) {
01130         char transport[2048];
01131 
01132         /*
01133          * WMS serves all UDP data over a single connection, the RTX, which
01134          * isn't necessarily the first in the SDP but has to be the first
01135          * to be set up, else the second/third SETUP will fail with a 461.
01136          */
01137         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
01138              rt->server_type == RTSP_SERVER_WMS) {
01139             if (i == 0) {
01140                 /* rtx first */
01141                 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
01142                     int len = strlen(rt->rtsp_streams[rtx]->control_url);
01143                     if (len >= 4 &&
01144                         !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
01145                                 "/rtx"))
01146                         break;
01147                 }
01148                 if (rtx == rt->nb_rtsp_streams)
01149                     return -1; /* no RTX found */
01150                 rtsp_st = rt->rtsp_streams[rtx];
01151             } else
01152                 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
01153         } else
01154             rtsp_st = rt->rtsp_streams[i];
01155 
01156         /* RTP/UDP */
01157         if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
01158             char buf[256];
01159 
01160             if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
01161                 port = reply->transports[0].client_port_min;
01162                 goto have_port;
01163             }
01164 
01165             /* first try in specified port range */
01166             while (j <= rt->rtp_port_max) {
01167                 ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
01168                             "?localport=%d", j);
01169                 /* we will use two ports per rtp stream (rtp and rtcp) */
01170                 j += 2;
01171                 if (!ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
01172                                &s->interrupt_callback, NULL))
01173                     goto rtp_opened;
01174             }
01175             av_log(s, AV_LOG_ERROR, "Unable to open an input RTP port\n");
01176             err = AVERROR(EIO);
01177             goto fail;
01178 
01179         rtp_opened:
01180             port = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
01181         have_port:
01182             snprintf(transport, sizeof(transport) - 1,
01183                      "%s/UDP;", trans_pref);
01184             if (rt->server_type != RTSP_SERVER_REAL)
01185                 av_strlcat(transport, "unicast;", sizeof(transport));
01186             av_strlcatf(transport, sizeof(transport),
01187                      "client_port=%d", port);
01188             if (rt->transport == RTSP_TRANSPORT_RTP &&
01189                 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
01190                 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
01191         }
01192 
01193         /* RTP/TCP */
01194         else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
01195             /* For WMS streams, the application streams are only used for
01196              * UDP. When trying to set it up for TCP streams, the server
01197              * will return an error. Therefore, we skip those streams. */
01198             if (rt->server_type == RTSP_SERVER_WMS &&
01199                 s->streams[rtsp_st->stream_index]->codec->codec_type ==
01200                     AVMEDIA_TYPE_DATA)
01201                 continue;
01202             snprintf(transport, sizeof(transport) - 1,
01203                      "%s/TCP;", trans_pref);
01204             if (rt->transport != RTSP_TRANSPORT_RDT)
01205                 av_strlcat(transport, "unicast;", sizeof(transport));
01206             av_strlcatf(transport, sizeof(transport),
01207                         "interleaved=%d-%d",
01208                         interleave, interleave + 1);
01209             interleave += 2;
01210         }
01211 
01212         else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
01213             snprintf(transport, sizeof(transport) - 1,
01214                      "%s/UDP;multicast", trans_pref);
01215         }
01216         if (s->oformat) {
01217             av_strlcat(transport, ";mode=receive", sizeof(transport));
01218         } else if (rt->server_type == RTSP_SERVER_REAL ||
01219                    rt->server_type == RTSP_SERVER_WMS)
01220             av_strlcat(transport, ";mode=play", sizeof(transport));
01221         snprintf(cmd, sizeof(cmd),
01222                  "Transport: %s\r\n",
01223                  transport);
01224         if (rt->accept_dynamic_rate)
01225             av_strlcat(cmd, "x-Dynamic-Rate: 0\r\n", sizeof(cmd));
01226         if (i == 0 && rt->server_type == RTSP_SERVER_REAL && CONFIG_RTPDEC) {
01227             char real_res[41], real_csum[9];
01228             ff_rdt_calc_response_and_checksum(real_res, real_csum,
01229                                               real_challenge);
01230             av_strlcatf(cmd, sizeof(cmd),
01231                         "If-Match: %s\r\n"
01232                         "RealChallenge2: %s, sd=%s\r\n",
01233                         rt->session_id, real_res, real_csum);
01234         }
01235         ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
01236         if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
01237             err = 1;
01238             goto fail;
01239         } else if (reply->status_code != RTSP_STATUS_OK ||
01240                    reply->nb_transports != 1) {
01241             err = AVERROR_INVALIDDATA;
01242             goto fail;
01243         }
01244 
01245         /* XXX: same protocol for all streams is required */
01246         if (i > 0) {
01247             if (reply->transports[0].lower_transport != rt->lower_transport ||
01248                 reply->transports[0].transport != rt->transport) {
01249                 err = AVERROR_INVALIDDATA;
01250                 goto fail;
01251             }
01252         } else {
01253             rt->lower_transport = reply->transports[0].lower_transport;
01254             rt->transport = reply->transports[0].transport;
01255         }
01256 
01257         /* Fail if the server responded with another lower transport mode
01258          * than what we requested. */
01259         if (reply->transports[0].lower_transport != lower_transport) {
01260             av_log(s, AV_LOG_ERROR, "Nonmatching transport in server reply\n");
01261             err = AVERROR_INVALIDDATA;
01262             goto fail;
01263         }
01264 
01265         switch(reply->transports[0].lower_transport) {
01266         case RTSP_LOWER_TRANSPORT_TCP:
01267             rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
01268             rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
01269             break;
01270 
01271         case RTSP_LOWER_TRANSPORT_UDP: {
01272             char url[1024], options[30] = "";
01273 
01274             if (rt->rtsp_flags & RTSP_FLAG_FILTER_SRC)
01275                 av_strlcpy(options, "?connect=1", sizeof(options));
01276             /* Use source address if specified */
01277             if (reply->transports[0].source[0]) {
01278                 ff_url_join(url, sizeof(url), "rtp", NULL,
01279                             reply->transports[0].source,
01280                             reply->transports[0].server_port_min, "%s", options);
01281             } else {
01282                 ff_url_join(url, sizeof(url), "rtp", NULL, host,
01283                             reply->transports[0].server_port_min, "%s", options);
01284             }
01285             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
01286                 ff_rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
01287                 err = AVERROR_INVALIDDATA;
01288                 goto fail;
01289             }
01290             /* Try to initialize the connection state in a
01291              * potential NAT router by sending dummy packets.
01292              * RTP/RTCP dummy packets are used for RDT, too.
01293              */
01294             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat &&
01295                 CONFIG_RTPDEC)
01296                 ff_rtp_send_punch_packets(rtsp_st->rtp_handle);
01297             break;
01298         }
01299         case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
01300             char url[1024], namebuf[50];
01301             struct sockaddr_storage addr;
01302             int port, ttl;
01303 
01304             if (reply->transports[0].destination.ss_family) {
01305                 addr      = reply->transports[0].destination;
01306                 port      = reply->transports[0].port_min;
01307                 ttl       = reply->transports[0].ttl;
01308             } else {
01309                 addr      = rtsp_st->sdp_ip;
01310                 port      = rtsp_st->sdp_port;
01311                 ttl       = rtsp_st->sdp_ttl;
01312             }
01313             getnameinfo((struct sockaddr*) &addr, sizeof(addr),
01314                         namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
01315             ff_url_join(url, sizeof(url), "rtp", NULL, namebuf,
01316                         port, "?ttl=%d", ttl);
01317             if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
01318                            &s->interrupt_callback, NULL) < 0) {
01319                 err = AVERROR_INVALIDDATA;
01320                 goto fail;
01321             }
01322             break;
01323         }
01324         }
01325 
01326         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
01327             goto fail;
01328     }
01329 
01330     if (reply->timeout > 0)
01331         rt->timeout = reply->timeout;
01332 
01333     if (rt->server_type == RTSP_SERVER_REAL)
01334         rt->need_subscription = 1;
01335 
01336     return 0;
01337 
01338 fail:
01339     ff_rtsp_undo_setup(s);
01340     return err;
01341 }
01342 
01343 void ff_rtsp_close_connections(AVFormatContext *s)
01344 {
01345     RTSPState *rt = s->priv_data;
01346     if (rt->rtsp_hd_out != rt->rtsp_hd) ffurl_close(rt->rtsp_hd_out);
01347     ffurl_close(rt->rtsp_hd);
01348     rt->rtsp_hd = rt->rtsp_hd_out = NULL;
01349 }
01350 
01351 int ff_rtsp_connect(AVFormatContext *s)
01352 {
01353     RTSPState *rt = s->priv_data;
01354     char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
01355     char *option_list, *option, *filename;
01356     int port, err, tcp_fd;
01357     RTSPMessageHeader reply1 = {0}, *reply = &reply1;
01358     int lower_transport_mask = 0;
01359     char real_challenge[64] = "";
01360     struct sockaddr_storage peer;
01361     socklen_t peer_len = sizeof(peer);
01362 
01363     if (rt->rtp_port_max < rt->rtp_port_min) {
01364         av_log(s, AV_LOG_ERROR, "Invalid UDP port range, max port %d less "
01365                                 "than min port %d\n", rt->rtp_port_max,
01366                                                       rt->rtp_port_min);
01367         return AVERROR(EINVAL);
01368     }
01369 
01370     if (!ff_network_init())
01371         return AVERROR(EIO);
01372 
01373     rt->control_transport = RTSP_MODE_PLAIN;
01374     if (rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_HTTP)) {
01375         rt->lower_transport_mask = 1 << RTSP_LOWER_TRANSPORT_TCP;
01376         rt->control_transport = RTSP_MODE_TUNNEL;
01377     }
01378     /* Only pass through valid flags from here */
01379     rt->lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
01380 
01381 redirect:
01382     lower_transport_mask = rt->lower_transport_mask;
01383     /* extract hostname and port */
01384     av_url_split(NULL, 0, auth, sizeof(auth),
01385                  host, sizeof(host), &port, path, sizeof(path), s->filename);
01386     if (*auth) {
01387         av_strlcpy(rt->auth, auth, sizeof(rt->auth));
01388     }
01389     if (port < 0)
01390         port = RTSP_DEFAULT_PORT;
01391 
01392 #if FF_API_RTSP_URL_OPTIONS
01393     /* search for options */
01394     option_list = strrchr(path, '?');
01395     if (option_list) {
01396         /* Strip out the RTSP specific options, write out the rest of
01397          * the options back into the same string. */
01398         filename = option_list;
01399         while (option_list) {
01400             int handled = 1;
01401             /* move the option pointer */
01402             option = ++option_list;
01403             option_list = strchr(option_list, '&');
01404             if (option_list)
01405                 *option_list = 0;
01406 
01407             /* handle the options */
01408             if (!strcmp(option, "udp")) {
01409                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
01410             } else if (!strcmp(option, "multicast")) {
01411                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
01412             } else if (!strcmp(option, "tcp")) {
01413                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
01414             } else if(!strcmp(option, "http")) {
01415                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
01416                 rt->control_transport = RTSP_MODE_TUNNEL;
01417             } else if (!strcmp(option, "filter_src")) {
01418                 rt->rtsp_flags |= RTSP_FLAG_FILTER_SRC;
01419             } else {
01420                 /* Write options back into the buffer, using memmove instead
01421                  * of strcpy since the strings may overlap. */
01422                 int len = strlen(option);
01423                 memmove(++filename, option, len);
01424                 filename += len;
01425                 if (option_list) *filename = '&';
01426                 handled = 0;
01427             }
01428             if (handled)
01429                 av_log(s, AV_LOG_WARNING, "Options passed via URL are "
01430                                           "deprecated, use -rtsp_transport "
01431                                           "and -rtsp_flags instead.\n");
01432         }
01433         *filename = 0;
01434     }
01435 #endif
01436 
01437     if (!lower_transport_mask)
01438         lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
01439 
01440     if (s->oformat) {
01441         /* Only UDP or TCP - UDP multicast isn't supported. */
01442         lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
01443                                 (1 << RTSP_LOWER_TRANSPORT_TCP);
01444         if (!lower_transport_mask || rt->control_transport == RTSP_MODE_TUNNEL) {
01445             av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
01446                                     "only UDP and TCP are supported for output.\n");
01447             err = AVERROR(EINVAL);
01448             goto fail;
01449         }
01450     }
01451 
01452     /* Construct the URI used in request; this is similar to s->filename,
01453      * but with authentication credentials removed and RTSP specific options
01454      * stripped out. */
01455     ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
01456                 host, port, "%s", path);
01457 
01458     if (rt->control_transport == RTSP_MODE_TUNNEL) {
01459         /* set up initial handshake for tunneling */
01460         char httpname[1024];
01461         char sessioncookie[17];
01462         char headers[1024];
01463 
01464         ff_url_join(httpname, sizeof(httpname), "http", auth, host, port, "%s", path);
01465         snprintf(sessioncookie, sizeof(sessioncookie), "%08x%08x",
01466                  av_get_random_seed(), av_get_random_seed());
01467 
01468         /* GET requests */
01469         if (ffurl_alloc(&rt->rtsp_hd, httpname, AVIO_FLAG_READ,
01470                         &s->interrupt_callback) < 0) {
01471             err = AVERROR(EIO);
01472             goto fail;
01473         }
01474 
01475         /* generate GET headers */
01476         snprintf(headers, sizeof(headers),
01477                  "x-sessioncookie: %s\r\n"
01478                  "Accept: application/x-rtsp-tunnelled\r\n"
01479                  "Pragma: no-cache\r\n"
01480                  "Cache-Control: no-cache\r\n",
01481                  sessioncookie);
01482         av_opt_set(rt->rtsp_hd->priv_data, "headers", headers, 0);
01483 
01484         /* complete the connection */
01485         if (ffurl_connect(rt->rtsp_hd, NULL)) {
01486             err = AVERROR(EIO);
01487             goto fail;
01488         }
01489 
01490         /* POST requests */
01491         if (ffurl_alloc(&rt->rtsp_hd_out, httpname, AVIO_FLAG_WRITE,
01492                         &s->interrupt_callback) < 0 ) {
01493             err = AVERROR(EIO);
01494             goto fail;
01495         }
01496 
01497         /* generate POST headers */
01498         snprintf(headers, sizeof(headers),
01499                  "x-sessioncookie: %s\r\n"
01500                  "Content-Type: application/x-rtsp-tunnelled\r\n"
01501                  "Pragma: no-cache\r\n"
01502                  "Cache-Control: no-cache\r\n"
01503                  "Content-Length: 32767\r\n"
01504                  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
01505                  sessioncookie);
01506         av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
01507         av_opt_set(rt->rtsp_hd_out->priv_data, "chunked_post", "0", 0);
01508 
01509         /* Initialize the authentication state for the POST session. The HTTP
01510          * protocol implementation doesn't properly handle multi-pass
01511          * authentication for POST requests, since it would require one of
01512          * the following:
01513          * - implementing Expect: 100-continue, which many HTTP servers
01514          *   don't support anyway, even less the RTSP servers that do HTTP
01515          *   tunneling
01516          * - sending the whole POST data until getting a 401 reply specifying
01517          *   what authentication method to use, then resending all that data
01518          * - waiting for potential 401 replies directly after sending the
01519          *   POST header (waiting for some unspecified time)
01520          * Therefore, we copy the full auth state, which works for both basic
01521          * and digest. (For digest, we would have to synchronize the nonce
01522          * count variable between the two sessions, if we'd do more requests
01523          * with the original session, though.)
01524          */
01525         ff_http_init_auth_state(rt->rtsp_hd_out, rt->rtsp_hd);
01526 
01527         /* complete the connection */
01528         if (ffurl_connect(rt->rtsp_hd_out, NULL)) {
01529             err = AVERROR(EIO);
01530             goto fail;
01531         }
01532     } else {
01533         /* open the tcp connection */
01534         ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
01535         if (ffurl_open(&rt->rtsp_hd, tcpname, AVIO_FLAG_READ_WRITE,
01536                        &s->interrupt_callback, NULL) < 0) {
01537             err = AVERROR(EIO);
01538             goto fail;
01539         }
01540         rt->rtsp_hd_out = rt->rtsp_hd;
01541     }
01542     rt->seq = 0;
01543 
01544     tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
01545     if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
01546         getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
01547                     NULL, 0, NI_NUMERICHOST);
01548     }
01549 
01550     /* request options supported by the server; this also detects server
01551      * type */
01552     for (rt->server_type = RTSP_SERVER_RTP;;) {
01553         cmd[0] = 0;
01554         if (rt->server_type == RTSP_SERVER_REAL)
01555             av_strlcat(cmd,
01556                        /*
01557                         * The following entries are required for proper
01558                         * streaming from a Realmedia server. They are
01559                         * interdependent in some way although we currently
01560                         * don't quite understand how. Values were copied
01561                         * from mplayer SVN r23589.
01562                         *   ClientChallenge is a 16-byte ID in hex
01563                         *   CompanyID is a 16-byte ID in base64
01564                         */
01565                        "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
01566                        "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
01567                        "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
01568                        "GUID: 00000000-0000-0000-0000-000000000000\r\n",
01569                        sizeof(cmd));
01570         ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
01571         if (reply->status_code != RTSP_STATUS_OK) {
01572             err = AVERROR_INVALIDDATA;
01573             goto fail;
01574         }
01575 
01576         /* detect server type if not standard-compliant RTP */
01577         if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
01578             rt->server_type = RTSP_SERVER_REAL;
01579             continue;
01580         } else if (!av_strncasecmp(reply->server, "WMServer/", 9)) {
01581             rt->server_type = RTSP_SERVER_WMS;
01582         } else if (rt->server_type == RTSP_SERVER_REAL)
01583             strcpy(real_challenge, reply->real_challenge);
01584         break;
01585     }
01586 
01587     if (s->iformat && CONFIG_RTSP_DEMUXER)
01588         err = ff_rtsp_setup_input_streams(s, reply);
01589     else if (CONFIG_RTSP_MUXER)
01590         err = ff_rtsp_setup_output_streams(s, host);
01591     if (err)
01592         goto fail;
01593 
01594     do {
01595         int lower_transport = ff_log2_tab[lower_transport_mask &
01596                                   ~(lower_transport_mask - 1)];
01597 
01598         err = ff_rtsp_make_setup_request(s, host, port, lower_transport,
01599                                  rt->server_type == RTSP_SERVER_REAL ?
01600                                      real_challenge : NULL);
01601         if (err < 0)
01602             goto fail;
01603         lower_transport_mask &= ~(1 << lower_transport);
01604         if (lower_transport_mask == 0 && err == 1) {
01605             err = AVERROR(EPROTONOSUPPORT);
01606             goto fail;
01607         }
01608     } while (err);
01609 
01610     rt->lower_transport_mask = lower_transport_mask;
01611     av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge));
01612     rt->state = RTSP_STATE_IDLE;
01613     rt->seek_timestamp = 0; /* default is to start stream at position zero */
01614     return 0;
01615  fail:
01616     ff_rtsp_close_streams(s);
01617     ff_rtsp_close_connections(s);
01618     if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
01619         av_strlcpy(s->filename, reply->location, sizeof(s->filename));
01620         av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
01621                reply->status_code,
01622                s->filename);
01623         goto redirect;
01624     }
01625     ff_network_close();
01626     return err;
01627 }
01628 #endif /* CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER */
01629 
01630 #if CONFIG_RTPDEC
01631 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
01632                            uint8_t *buf, int buf_size, int64_t wait_end)
01633 {
01634     RTSPState *rt = s->priv_data;
01635     RTSPStream *rtsp_st;
01636     int n, i, ret, tcp_fd, timeout_cnt = 0;
01637     int max_p = 0;
01638     struct pollfd *p = rt->p;
01639 
01640     for (;;) {
01641         if (ff_check_interrupt(&s->interrupt_callback))
01642             return AVERROR_EXIT;
01643         if (wait_end && wait_end - av_gettime() < 0)
01644             return AVERROR(EAGAIN);
01645         max_p = 0;
01646         if (rt->rtsp_hd) {
01647             tcp_fd = ffurl_get_file_handle(rt->rtsp_hd);
01648             p[max_p].fd = tcp_fd;
01649             p[max_p++].events = POLLIN;
01650         } else {
01651             tcp_fd = -1;
01652         }
01653         for (i = 0; i < rt->nb_rtsp_streams; i++) {
01654             rtsp_st = rt->rtsp_streams[i];
01655             if (rtsp_st->rtp_handle) {
01656                 p[max_p].fd = ffurl_get_file_handle(rtsp_st->rtp_handle);
01657                 p[max_p++].events = POLLIN;
01658                 p[max_p].fd = ff_rtp_get_rtcp_file_handle(rtsp_st->rtp_handle);
01659                 p[max_p++].events = POLLIN;
01660             }
01661         }
01662         n = poll(p, max_p, POLL_TIMEOUT_MS);
01663         if (n > 0) {
01664             int j = 1 - (tcp_fd == -1);
01665             timeout_cnt = 0;
01666             for (i = 0; i < rt->nb_rtsp_streams; i++) {
01667                 rtsp_st = rt->rtsp_streams[i];
01668                 if (rtsp_st->rtp_handle) {
01669                     if (p[j].revents & POLLIN || p[j+1].revents & POLLIN) {
01670                         ret = ffurl_read(rtsp_st->rtp_handle, buf, buf_size);
01671                         if (ret > 0) {
01672                             *prtsp_st = rtsp_st;
01673                             return ret;
01674                         }
01675                     }
01676                     j+=2;
01677                 }
01678             }
01679 #if CONFIG_RTSP_DEMUXER
01680             if (tcp_fd != -1 && p[0].revents & POLLIN) {
01681                 RTSPMessageHeader reply;
01682 
01683                 ret = ff_rtsp_read_reply(s, &reply, NULL, 0, NULL);
01684                 if (ret < 0)
01685                     return ret;
01686                 /* XXX: parse message */
01687                 if (rt->state != RTSP_STATE_STREAMING)
01688                     return 0;
01689             }
01690 #endif
01691         } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
01692             return AVERROR(ETIMEDOUT);
01693         } else if (n < 0 && errno != EINTR)
01694             return AVERROR(errno);
01695     }
01696 }
01697 
01698 int ff_rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
01699 {
01700     RTSPState *rt = s->priv_data;
01701     int ret, len;
01702     RTSPStream *rtsp_st, *first_queue_st = NULL;
01703     int64_t wait_end = 0;
01704 
01705     if (rt->nb_byes == rt->nb_rtsp_streams)
01706         return AVERROR_EOF;
01707 
01708     /* get next frames from the same RTP packet */
01709     if (rt->cur_transport_priv) {
01710         if (rt->transport == RTSP_TRANSPORT_RDT) {
01711             ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
01712         } else
01713             ret = ff_rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
01714         if (ret == 0) {
01715             rt->cur_transport_priv = NULL;
01716             return 0;
01717         } else if (ret == 1) {
01718             return 0;
01719         } else
01720             rt->cur_transport_priv = NULL;
01721     }
01722 
01723     if (rt->transport == RTSP_TRANSPORT_RTP) {
01724         int i;
01725         int64_t first_queue_time = 0;
01726         for (i = 0; i < rt->nb_rtsp_streams; i++) {
01727             RTPDemuxContext *rtpctx = rt->rtsp_streams[i]->transport_priv;
01728             int64_t queue_time;
01729             if (!rtpctx)
01730                 continue;
01731             queue_time = ff_rtp_queued_packet_time(rtpctx);
01732             if (queue_time && (queue_time - first_queue_time < 0 ||
01733                                !first_queue_time)) {
01734                 first_queue_time = queue_time;
01735                 first_queue_st   = rt->rtsp_streams[i];
01736             }
01737         }
01738         if (first_queue_time)
01739             wait_end = first_queue_time + s->max_delay;
01740     }
01741 
01742     /* read next RTP packet */
01743  redo:
01744     if (!rt->recvbuf) {
01745         rt->recvbuf = av_malloc(RECVBUF_SIZE);
01746         if (!rt->recvbuf)
01747             return AVERROR(ENOMEM);
01748     }
01749 
01750     switch(rt->lower_transport) {
01751     default:
01752 #if CONFIG_RTSP_DEMUXER
01753     case RTSP_LOWER_TRANSPORT_TCP:
01754         len = ff_rtsp_tcp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE);
01755         break;
01756 #endif
01757     case RTSP_LOWER_TRANSPORT_UDP:
01758     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
01759         len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
01760         if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
01761             ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
01762         break;
01763     }
01764     if (len == AVERROR(EAGAIN) && first_queue_st &&
01765         rt->transport == RTSP_TRANSPORT_RTP) {
01766         rtsp_st = first_queue_st;
01767         ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, NULL, 0);
01768         goto end;
01769     }
01770     if (len < 0)
01771         return len;
01772     if (len == 0)
01773         return AVERROR_EOF;
01774     if (rt->transport == RTSP_TRANSPORT_RDT) {
01775         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
01776     } else {
01777         ret = ff_rtp_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
01778         if (ret < 0) {
01779             /* Either bad packet, or a RTCP packet. Check if the
01780              * first_rtcp_ntp_time field was initialized. */
01781             RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
01782             if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
01783                 /* first_rtcp_ntp_time has been initialized for this stream,
01784                  * copy the same value to all other uninitialized streams,
01785                  * in order to map their timestamp origin to the same ntp time
01786                  * as this one. */
01787                 int i;
01788                 AVStream *st = NULL;
01789                 if (rtsp_st->stream_index >= 0)
01790                     st = s->streams[rtsp_st->stream_index];
01791                 for (i = 0; i < rt->nb_rtsp_streams; i++) {
01792                     RTPDemuxContext *rtpctx2 = rt->rtsp_streams[i]->transport_priv;
01793                     AVStream *st2 = NULL;
01794                     if (rt->rtsp_streams[i]->stream_index >= 0)
01795                         st2 = s->streams[rt->rtsp_streams[i]->stream_index];
01796                     if (rtpctx2 && st && st2 &&
01797                         rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
01798                         rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
01799                         rtpctx2->rtcp_ts_offset = av_rescale_q(
01800                             rtpctx->rtcp_ts_offset, st->time_base,
01801                             st2->time_base);
01802                     }
01803                 }
01804             }
01805             if (ret == -RTCP_BYE) {
01806                 rt->nb_byes++;
01807 
01808                 av_log(s, AV_LOG_DEBUG, "Received BYE for stream %d (%d/%d)\n",
01809                        rtsp_st->stream_index, rt->nb_byes, rt->nb_rtsp_streams);
01810 
01811                 if (rt->nb_byes == rt->nb_rtsp_streams)
01812                     return AVERROR_EOF;
01813             }
01814         }
01815     }
01816 end:
01817     if (ret < 0)
01818         goto redo;
01819     if (ret == 1)
01820         /* more packets may follow, so we save the RTP context */
01821         rt->cur_transport_priv = rtsp_st->transport_priv;
01822 
01823     return ret;
01824 }
01825 #endif /* CONFIG_RTPDEC */
01826 
01827 #if CONFIG_SDP_DEMUXER
01828 static int sdp_probe(AVProbeData *p1)
01829 {
01830     const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
01831 
01832     /* we look for a line beginning "c=IN IP" */
01833     while (p < p_end && *p != '\0') {
01834         if (p + sizeof("c=IN IP") - 1 < p_end &&
01835             av_strstart(p, "c=IN IP", NULL))
01836             return AVPROBE_SCORE_MAX / 2;
01837 
01838         while (p < p_end - 1 && *p != '\n') p++;
01839         if (++p >= p_end)
01840             break;
01841         if (*p == '\r')
01842             p++;
01843     }
01844     return 0;
01845 }
01846 
01847 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
01848 {
01849     RTSPState *rt = s->priv_data;
01850     RTSPStream *rtsp_st;
01851     int size, i, err;
01852     char *content;
01853     char url[1024];
01854 
01855     if (!ff_network_init())
01856         return AVERROR(EIO);
01857 
01858     /* read the whole sdp file */
01859     /* XXX: better loading */
01860     content = av_malloc(SDP_MAX_SIZE);
01861     size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
01862     if (size <= 0) {
01863         av_free(content);
01864         return AVERROR_INVALIDDATA;
01865     }
01866     content[size] ='\0';
01867 
01868     err = ff_sdp_parse(s, content);
01869     av_free(content);
01870     if (err) goto fail;
01871 
01872     /* open each RTP stream */
01873     for (i = 0; i < rt->nb_rtsp_streams; i++) {
01874         char namebuf[50];
01875         rtsp_st = rt->rtsp_streams[i];
01876 
01877         getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
01878                     namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
01879         ff_url_join(url, sizeof(url), "rtp", NULL,
01880                     namebuf, rtsp_st->sdp_port,
01881                     "?localport=%d&ttl=%d&connect=%d", rtsp_st->sdp_port,
01882                     rtsp_st->sdp_ttl,
01883                     rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0);
01884         if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
01885                        &s->interrupt_callback, NULL) < 0) {
01886             err = AVERROR_INVALIDDATA;
01887             goto fail;
01888         }
01889         if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
01890             goto fail;
01891     }
01892     return 0;
01893 fail:
01894     ff_rtsp_close_streams(s);
01895     ff_network_close();
01896     return err;
01897 }
01898 
01899 static int sdp_read_close(AVFormatContext *s)
01900 {
01901     ff_rtsp_close_streams(s);
01902     ff_network_close();
01903     return 0;
01904 }
01905 
01906 static const AVClass sdp_demuxer_class = {
01907     .class_name     = "SDP demuxer",
01908     .item_name      = av_default_item_name,
01909     .option         = sdp_options,
01910     .version        = LIBAVUTIL_VERSION_INT,
01911 };
01912 
01913 AVInputFormat ff_sdp_demuxer = {
01914     .name           = "sdp",
01915     .long_name      = NULL_IF_CONFIG_SMALL("SDP"),
01916     .priv_data_size = sizeof(RTSPState),
01917     .read_probe     = sdp_probe,
01918     .read_header    = sdp_read_header,
01919     .read_packet    = ff_rtsp_fetch_packet,
01920     .read_close     = sdp_read_close,
01921     .priv_class     = &sdp_demuxer_class
01922 };
01923 #endif /* CONFIG_SDP_DEMUXER */
01924 
01925 #if CONFIG_RTP_DEMUXER
01926 static int rtp_probe(AVProbeData *p)
01927 {
01928     if (av_strstart(p->filename, "rtp:", NULL))
01929         return AVPROBE_SCORE_MAX;
01930     return 0;
01931 }
01932 
01933 static int rtp_read_header(AVFormatContext *s,
01934                            AVFormatParameters *ap)
01935 {
01936     uint8_t recvbuf[1500];
01937     char host[500], sdp[500];
01938     int ret, port;
01939     URLContext* in = NULL;
01940     int payload_type;
01941     AVCodecContext codec;
01942     struct sockaddr_storage addr;
01943     AVIOContext pb;
01944     socklen_t addrlen = sizeof(addr);
01945     RTSPState *rt = s->priv_data;
01946 
01947     if (!ff_network_init())
01948         return AVERROR(EIO);
01949 
01950     ret = ffurl_open(&in, s->filename, AVIO_FLAG_READ,
01951                      &s->interrupt_callback, NULL);
01952     if (ret)
01953         goto fail;
01954 
01955     while (1) {
01956         ret = ffurl_read(in, recvbuf, sizeof(recvbuf));
01957         if (ret == AVERROR(EAGAIN))
01958             continue;
01959         if (ret < 0)
01960             goto fail;
01961         if (ret < 12) {
01962             av_log(s, AV_LOG_WARNING, "Received too short packet\n");
01963             continue;
01964         }
01965 
01966         if ((recvbuf[0] & 0xc0) != 0x80) {
01967             av_log(s, AV_LOG_WARNING, "Unsupported RTP version packet "
01968                                       "received\n");
01969             continue;
01970         }
01971 
01972         payload_type = recvbuf[1] & 0x7f;
01973         break;
01974     }
01975     getsockname(ffurl_get_file_handle(in), (struct sockaddr*) &addr, &addrlen);
01976     ffurl_close(in);
01977     in = NULL;
01978 
01979     memset(&codec, 0, sizeof(codec));
01980     if (ff_rtp_get_codec_info(&codec, payload_type)) {
01981         av_log(s, AV_LOG_ERROR, "Unable to receive RTP payload type %d "
01982                                 "without an SDP file describing it\n",
01983                                  payload_type);
01984         goto fail;
01985     }
01986     if (codec.codec_type != AVMEDIA_TYPE_DATA) {
01987         av_log(s, AV_LOG_WARNING, "Guessing on RTP content - if not received "
01988                                   "properly you need an SDP file "
01989                                   "describing it\n");
01990     }
01991 
01992     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
01993                  NULL, 0, s->filename);
01994 
01995     snprintf(sdp, sizeof(sdp),
01996              "v=0\r\nc=IN IP%d %s\r\nm=%s %d RTP/AVP %d\r\n",
01997              addr.ss_family == AF_INET ? 4 : 6, host,
01998              codec.codec_type == AVMEDIA_TYPE_DATA  ? "application" :
01999              codec.codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
02000              port, payload_type);
02001     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
02002 
02003     ffio_init_context(&pb, sdp, strlen(sdp), 0, NULL, NULL, NULL, NULL);
02004     s->pb = &pb;
02005 
02006     /* sdp_read_header initializes this again */
02007     ff_network_close();
02008 
02009     rt->media_type_mask = (1 << (AVMEDIA_TYPE_DATA+1)) - 1;
02010 
02011     ret = sdp_read_header(s, ap);
02012     s->pb = NULL;
02013     return ret;
02014 
02015 fail:
02016     if (in)
02017         ffurl_close(in);
02018     ff_network_close();
02019     return ret;
02020 }
02021 
02022 static const AVClass rtp_demuxer_class = {
02023     .class_name     = "RTP demuxer",
02024     .item_name      = av_default_item_name,
02025     .option         = rtp_options,
02026     .version        = LIBAVUTIL_VERSION_INT,
02027 };
02028 
02029 AVInputFormat ff_rtp_demuxer = {
02030     .name           = "rtp",
02031     .long_name      = NULL_IF_CONFIG_SMALL("RTP input format"),
02032     .priv_data_size = sizeof(RTSPState),
02033     .read_probe     = rtp_probe,
02034     .read_header    = rtp_read_header,
02035     .read_packet    = ff_rtsp_fetch_packet,
02036     .read_close     = sdp_read_close,
02037     .flags = AVFMT_NOFILE,
02038     .priv_class     = &rtp_demuxer_class
02039 };
02040 #endif /* CONFIG_RTP_DEMUXER */
02041