• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavformat/rtspdec.c

Go to the documentation of this file.
00001 /*
00002  * RTSP demuxer
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/avstring.h"
00023 #include "libavutil/intreadwrite.h"
00024 #include "libavutil/mathematics.h"
00025 #include "avformat.h"
00026 
00027 #include "internal.h"
00028 #include "network.h"
00029 #include "os_support.h"
00030 #include "rtsp.h"
00031 #include "rdt.h"
00032 #include "url.h"
00033 
00034 static int rtsp_read_play(AVFormatContext *s)
00035 {
00036     RTSPState *rt = s->priv_data;
00037     RTSPMessageHeader reply1, *reply = &reply1;
00038     int i;
00039     char cmd[1024];
00040 
00041     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
00042     rt->nb_byes = 0;
00043 
00044     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
00045         if (rt->transport == RTSP_TRANSPORT_RTP) {
00046             for (i = 0; i < rt->nb_rtsp_streams; i++) {
00047                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
00048                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
00049                 if (!rtpctx)
00050                     continue;
00051                 ff_rtp_reset_packet_queue(rtpctx);
00052                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
00053                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
00054                 rtpctx->base_timestamp      = 0;
00055                 rtpctx->timestamp           = 0;
00056                 rtpctx->unwrapped_timestamp = 0;
00057                 rtpctx->rtcp_ts_offset      = 0;
00058             }
00059         }
00060         if (rt->state == RTSP_STATE_PAUSED) {
00061             cmd[0] = 0;
00062         } else {
00063             snprintf(cmd, sizeof(cmd),
00064                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
00065                      rt->seek_timestamp / AV_TIME_BASE,
00066                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
00067         }
00068         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
00069         if (reply->status_code != RTSP_STATUS_OK) {
00070             return -1;
00071         }
00072         if (rt->transport == RTSP_TRANSPORT_RTP &&
00073             reply->range_start != AV_NOPTS_VALUE) {
00074             for (i = 0; i < rt->nb_rtsp_streams; i++) {
00075                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
00076                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
00077                 AVStream *st = NULL;
00078                 if (!rtpctx || rtsp_st->stream_index < 0)
00079                     continue;
00080                 st = s->streams[rtsp_st->stream_index];
00081                 rtpctx->range_start_offset =
00082                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
00083                                  st->time_base);
00084             }
00085         }
00086     }
00087     rt->state = RTSP_STATE_STREAMING;
00088     return 0;
00089 }
00090 
00091 /* pause the stream */
00092 static int rtsp_read_pause(AVFormatContext *s)
00093 {
00094     RTSPState *rt = s->priv_data;
00095     RTSPMessageHeader reply1, *reply = &reply1;
00096 
00097     if (rt->state != RTSP_STATE_STREAMING)
00098         return 0;
00099     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
00100         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
00101         if (reply->status_code != RTSP_STATUS_OK) {
00102             return -1;
00103         }
00104     }
00105     rt->state = RTSP_STATE_PAUSED;
00106     return 0;
00107 }
00108 
00109 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
00110 {
00111     RTSPState *rt = s->priv_data;
00112     char cmd[1024];
00113     unsigned char *content = NULL;
00114     int ret;
00115 
00116     /* describe the stream */
00117     snprintf(cmd, sizeof(cmd),
00118              "Accept: application/sdp\r\n");
00119     if (rt->server_type == RTSP_SERVER_REAL) {
00124         av_strlcat(cmd,
00125                    "Require: com.real.retain-entity-for-setup\r\n",
00126                    sizeof(cmd));
00127     }
00128     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
00129     if (!content)
00130         return AVERROR_INVALIDDATA;
00131     if (reply->status_code != RTSP_STATUS_OK) {
00132         av_freep(&content);
00133         return AVERROR_INVALIDDATA;
00134     }
00135 
00136     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
00137     /* now we got the SDP description, we parse it */
00138     ret = ff_sdp_parse(s, (const char *)content);
00139     av_freep(&content);
00140     if (ret < 0)
00141         return ret;
00142 
00143     return 0;
00144 }
00145 
00146 static int rtsp_probe(AVProbeData *p)
00147 {
00148     if (av_strstart(p->filename, "rtsp:", NULL))
00149         return AVPROBE_SCORE_MAX;
00150     return 0;
00151 }
00152 
00153 static int rtsp_read_header(AVFormatContext *s,
00154                             AVFormatParameters *ap)
00155 {
00156     RTSPState *rt = s->priv_data;
00157     int ret;
00158 
00159     ret = ff_rtsp_connect(s);
00160     if (ret)
00161         return ret;
00162 
00163     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
00164     if (!rt->real_setup_cache)
00165         return AVERROR(ENOMEM);
00166     rt->real_setup = rt->real_setup_cache + s->nb_streams;
00167 
00168     if (rt->initial_pause) {
00169          /* do not start immediately */
00170     } else {
00171          if (rtsp_read_play(s) < 0) {
00172             ff_rtsp_close_streams(s);
00173             ff_rtsp_close_connections(s);
00174             return AVERROR_INVALIDDATA;
00175         }
00176     }
00177 
00178     return 0;
00179 }
00180 
00181 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
00182                             uint8_t *buf, int buf_size)
00183 {
00184     RTSPState *rt = s->priv_data;
00185     int id, len, i, ret;
00186     RTSPStream *rtsp_st;
00187 
00188     av_dlog(s, "tcp_read_packet:\n");
00189 redo:
00190     for (;;) {
00191         RTSPMessageHeader reply;
00192 
00193         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
00194         if (ret < 0)
00195             return ret;
00196         if (ret == 1) /* received '$' */
00197             break;
00198         /* XXX: parse message */
00199         if (rt->state != RTSP_STATE_STREAMING)
00200             return 0;
00201     }
00202     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
00203     if (ret != 3)
00204         return -1;
00205     id  = buf[0];
00206     len = AV_RB16(buf + 1);
00207     av_dlog(s, "id=%d len=%d\n", id, len);
00208     if (len > buf_size || len < 8)
00209         goto redo;
00210     /* get the data */
00211     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
00212     if (ret != len)
00213         return -1;
00214     if (rt->transport == RTSP_TRANSPORT_RDT &&
00215         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
00216         return -1;
00217 
00218     /* find the matching stream */
00219     for (i = 0; i < rt->nb_rtsp_streams; i++) {
00220         rtsp_st = rt->rtsp_streams[i];
00221         if (id >= rtsp_st->interleaved_min &&
00222             id <= rtsp_st->interleaved_max)
00223             goto found;
00224     }
00225     goto redo;
00226 found:
00227     *prtsp_st = rtsp_st;
00228     return len;
00229 }
00230 
00231 static int resetup_tcp(AVFormatContext *s)
00232 {
00233     RTSPState *rt = s->priv_data;
00234     char host[1024];
00235     int port;
00236 
00237     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
00238                  s->filename);
00239     ff_rtsp_undo_setup(s);
00240     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
00241                                       rt->real_challenge);
00242 }
00243 
00244 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
00245 {
00246     RTSPState *rt = s->priv_data;
00247     int ret;
00248     RTSPMessageHeader reply1, *reply = &reply1;
00249     char cmd[1024];
00250 
00251 retry:
00252     if (rt->server_type == RTSP_SERVER_REAL) {
00253         int i;
00254 
00255         for (i = 0; i < s->nb_streams; i++)
00256             rt->real_setup[i] = s->streams[i]->discard;
00257 
00258         if (!rt->need_subscription) {
00259             if (memcmp (rt->real_setup, rt->real_setup_cache,
00260                         sizeof(enum AVDiscard) * s->nb_streams)) {
00261                 snprintf(cmd, sizeof(cmd),
00262                          "Unsubscribe: %s\r\n",
00263                          rt->last_subscription);
00264                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
00265                                  cmd, reply, NULL);
00266                 if (reply->status_code != RTSP_STATUS_OK)
00267                     return AVERROR_INVALIDDATA;
00268                 rt->need_subscription = 1;
00269             }
00270         }
00271 
00272         if (rt->need_subscription) {
00273             int r, rule_nr, first = 1;
00274 
00275             memcpy(rt->real_setup_cache, rt->real_setup,
00276                    sizeof(enum AVDiscard) * s->nb_streams);
00277             rt->last_subscription[0] = 0;
00278 
00279             snprintf(cmd, sizeof(cmd),
00280                      "Subscribe: ");
00281             for (i = 0; i < rt->nb_rtsp_streams; i++) {
00282                 rule_nr = 0;
00283                 for (r = 0; r < s->nb_streams; r++) {
00284                     if (s->streams[r]->id == i) {
00285                         if (s->streams[r]->discard != AVDISCARD_ALL) {
00286                             if (!first)
00287                                 av_strlcat(rt->last_subscription, ",",
00288                                            sizeof(rt->last_subscription));
00289                             ff_rdt_subscribe_rule(
00290                                 rt->last_subscription,
00291                                 sizeof(rt->last_subscription), i, rule_nr);
00292                             first = 0;
00293                         }
00294                         rule_nr++;
00295                     }
00296                 }
00297             }
00298             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
00299             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
00300                              cmd, reply, NULL);
00301             if (reply->status_code != RTSP_STATUS_OK)
00302                 return AVERROR_INVALIDDATA;
00303             rt->need_subscription = 0;
00304 
00305             if (rt->state == RTSP_STATE_STREAMING)
00306                 rtsp_read_play (s);
00307         }
00308     }
00309 
00310     ret = ff_rtsp_fetch_packet(s, pkt);
00311     if (ret < 0) {
00312         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
00313             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
00314                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
00315                 RTSPMessageHeader reply1, *reply = &reply1;
00316                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
00317                 if (rtsp_read_pause(s) != 0)
00318                     return -1;
00319                 // TEARDOWN is required on Real-RTSP, but might make
00320                 // other servers close the connection.
00321                 if (rt->server_type == RTSP_SERVER_REAL)
00322                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
00323                                      reply, NULL);
00324                 rt->session_id[0] = '\0';
00325                 if (resetup_tcp(s) == 0) {
00326                     rt->state = RTSP_STATE_IDLE;
00327                     rt->need_subscription = 1;
00328                     if (rtsp_read_play(s) != 0)
00329                         return -1;
00330                     goto retry;
00331                 }
00332             }
00333         }
00334         return ret;
00335     }
00336     rt->packets++;
00337 
00338     /* send dummy request to keep TCP connection alive */
00339     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
00340         if (rt->server_type == RTSP_SERVER_WMS ||
00341            (rt->server_type != RTSP_SERVER_REAL &&
00342             rt->get_parameter_supported)) {
00343             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
00344         } else {
00345             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
00346         }
00347     }
00348 
00349     return 0;
00350 }
00351 
00352 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
00353                           int64_t timestamp, int flags)
00354 {
00355     RTSPState *rt = s->priv_data;
00356 
00357     rt->seek_timestamp = av_rescale_q(timestamp,
00358                                       s->streams[stream_index]->time_base,
00359                                       AV_TIME_BASE_Q);
00360     switch(rt->state) {
00361     default:
00362     case RTSP_STATE_IDLE:
00363         break;
00364     case RTSP_STATE_STREAMING:
00365         if (rtsp_read_pause(s) != 0)
00366             return -1;
00367         rt->state = RTSP_STATE_SEEKING;
00368         if (rtsp_read_play(s) != 0)
00369             return -1;
00370         break;
00371     case RTSP_STATE_PAUSED:
00372         rt->state = RTSP_STATE_IDLE;
00373         break;
00374     }
00375     return 0;
00376 }
00377 
00378 static int rtsp_read_close(AVFormatContext *s)
00379 {
00380     RTSPState *rt = s->priv_data;
00381 
00382     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
00383 
00384     ff_rtsp_close_streams(s);
00385     ff_rtsp_close_connections(s);
00386     ff_network_close();
00387     rt->real_setup = NULL;
00388     av_freep(&rt->real_setup_cache);
00389     return 0;
00390 }
00391 
00392 const AVClass rtsp_demuxer_class = {
00393     .class_name     = "RTSP demuxer",
00394     .item_name      = av_default_item_name,
00395     .option         = ff_rtsp_options,
00396     .version        = LIBAVUTIL_VERSION_INT,
00397 };
00398 
00399 AVInputFormat ff_rtsp_demuxer = {
00400     .name           = "rtsp",
00401     .long_name      = NULL_IF_CONFIG_SMALL("RTSP input format"),
00402     .priv_data_size = sizeof(RTSPState),
00403     .read_probe     = rtsp_probe,
00404     .read_header    = rtsp_read_header,
00405     .read_packet    = rtsp_read_packet,
00406     .read_close     = rtsp_read_close,
00407     .read_seek      = rtsp_read_seek,
00408     .flags = AVFMT_NOFILE,
00409     .read_play = rtsp_read_play,
00410     .read_pause = rtsp_read_pause,
00411     .priv_class = &rtsp_demuxer_class,
00412 };
Generated on Fri Feb 1 2013 14:34:54 for FFmpeg by doxygen 1.7.1