git.sesse.net Git - ffmpeg/blob - libavformat/rtspdec.c

   1 /*
   2  * RTSP demuxer
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/intreadwrite.h"
  24 #include "libavutil/mathematics.h"
  25 #include "avformat.h"
  26
  27 #include "internal.h"
  28 #include "network.h"
  29 #include "os_support.h"
  30 #include "rtsp.h"
  31 #include "rdt.h"
  32 #include "url.h"
  33
  34 static int rtsp_read_close(AVFormatContext *s)
  35 {
  36     RTSPState *rt = s->priv_data;
  37
  38     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
  39
  40     ff_rtsp_close_streams(s);
  41     ff_rtsp_close_connections(s);
  42     ff_network_close();
  43     rt->real_setup = NULL;
  44     av_freep(&rt->real_setup_cache);
  45     return 0;
  46 }
  47
  48 static int rtsp_read_play(AVFormatContext *s)
  49 {
  50     RTSPState *rt = s->priv_data;
  51     RTSPMessageHeader reply1, *reply = &reply1;
  52     int i;
  53     char cmd[1024];
  54
  55     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
  56     rt->nb_byes = 0;
  57
  58     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
  59         if (rt->transport == RTSP_TRANSPORT_RTP) {
  60             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  61                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  62                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  63                 if (!rtpctx)
  64                     continue;
  65                 ff_rtp_reset_packet_queue(rtpctx);
  66                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
  67                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
  68                 rtpctx->base_timestamp      = 0;
  69                 rtpctx->timestamp           = 0;
  70                 rtpctx->unwrapped_timestamp = 0;
  71                 rtpctx->rtcp_ts_offset      = 0;
  72             }
  73         }
  74         if (rt->state == RTSP_STATE_PAUSED) {
  75             cmd[0] = 0;
  76         } else {
  77             snprintf(cmd, sizeof(cmd),
  78                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
  79                      rt->seek_timestamp / AV_TIME_BASE,
  80                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
  81         }
  82         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
  83         if (reply->status_code != RTSP_STATUS_OK) {
  84             return -1;
  85         }
  86         if (rt->transport == RTSP_TRANSPORT_RTP &&
  87             reply->range_start != AV_NOPTS_VALUE) {
  88             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  89                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  90                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  91                 AVStream *st = NULL;
  92                 if (!rtpctx || rtsp_st->stream_index < 0)
  93                     continue;
  94                 st = s->streams[rtsp_st->stream_index];
  95                 rtpctx->range_start_offset =
  96                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
  97                                  st->time_base);
  98             }
  99         }
 100     }
 101     rt->state = RTSP_STATE_STREAMING;
 102     return 0;
 103 }
 104
 105 /* pause the stream */
 106 static int rtsp_read_pause(AVFormatContext *s)
 107 {
 108     RTSPState *rt = s->priv_data;
 109     RTSPMessageHeader reply1, *reply = &reply1;
 110
 111     if (rt->state != RTSP_STATE_STREAMING)
 112         return 0;
 113     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
 114         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
 115         if (reply->status_code != RTSP_STATUS_OK) {
 116             return -1;
 117         }
 118     }
 119     rt->state = RTSP_STATE_PAUSED;
 120     return 0;
 121 }
 122
 123 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
 124 {
 125     RTSPState *rt = s->priv_data;
 126     char cmd[1024];
 127     unsigned char *content = NULL;
 128     int ret;
 129
 130     /* describe the stream */
 131     snprintf(cmd, sizeof(cmd),
 132              "Accept: application/sdp\r\n");
 133     if (rt->server_type == RTSP_SERVER_REAL) {
 134         /**
 135          * The Require: attribute is needed for proper streaming from
 136          * Realmedia servers.
 137          */
 138         av_strlcat(cmd,
 139                    "Require: com.real.retain-entity-for-setup\r\n",
 140                    sizeof(cmd));
 141     }
 142     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
 143     if (!content)
 144         return AVERROR_INVALIDDATA;
 145     if (reply->status_code != RTSP_STATUS_OK) {
 146         av_freep(&content);
 147         return AVERROR_INVALIDDATA;
 148     }
 149
 150     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
 151     /* now we got the SDP description, we parse it */
 152     ret = ff_sdp_parse(s, (const char *)content);
 153     av_freep(&content);
 154     if (ret < 0)
 155         return ret;
 156
 157     return 0;
 158 }
 159
 160 static int rtsp_probe(AVProbeData *p)
 161 {
 162     if (av_strstart(p->filename, "rtsp:", NULL))
 163         return AVPROBE_SCORE_MAX;
 164     return 0;
 165 }
 166
 167 static int rtsp_read_header(AVFormatContext *s)
 168 {
 169     RTSPState *rt = s->priv_data;
 170     int ret;
 171
 172     ret = ff_rtsp_connect(s);
 173     if (ret)
 174         return ret;
 175
 176     rt->real_setup_cache = !s->nb_streams ? NULL :
 177                            av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
 178     if (!rt->real_setup_cache && s->nb_streams)
 179         return AVERROR(ENOMEM);
 180     rt->real_setup = rt->real_setup_cache + s->nb_streams;
 181
 182     if (rt->initial_pause) {
 183          /* do not start immediately */
 184     } else {
 185          if (rtsp_read_play(s) < 0) {
 186             ff_rtsp_close_streams(s);
 187             ff_rtsp_close_connections(s);
 188             return AVERROR_INVALIDDATA;
 189         }
 190     }
 191
 192     return 0;
 193 }
 194
 195 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
 196                             uint8_t *buf, int buf_size)
 197 {
 198     RTSPState *rt = s->priv_data;
 199     int id, len, i, ret;
 200     RTSPStream *rtsp_st;
 201
 202     av_dlog(s, "tcp_read_packet:\n");
 203 redo:
 204     for (;;) {
 205         RTSPMessageHeader reply;
 206
 207         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
 208         if (ret < 0)
 209             return ret;
 210         if (ret == 1) /* received '$' */
 211             break;
 212         /* XXX: parse message */
 213         if (rt->state != RTSP_STATE_STREAMING)
 214             return 0;
 215     }
 216     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
 217     if (ret != 3)
 218         return -1;
 219     id  = buf[0];
 220     len = AV_RB16(buf + 1);
 221     av_dlog(s, "id=%d len=%d\n", id, len);
 222     if (len > buf_size || len < 12)
 223         goto redo;
 224     /* get the data */
 225     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
 226     if (ret != len)
 227         return -1;
 228     if (rt->transport == RTSP_TRANSPORT_RDT &&
 229         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
 230         return -1;
 231
 232     /* find the matching stream */
 233     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 234         rtsp_st = rt->rtsp_streams[i];
 235         if (id >= rtsp_st->interleaved_min &&
 236             id <= rtsp_st->interleaved_max)
 237             goto found;
 238     }
 239     goto redo;
 240 found:
 241     *prtsp_st = rtsp_st;
 242     return len;
 243 }
 244
 245 static int resetup_tcp(AVFormatContext *s)
 246 {
 247     RTSPState *rt = s->priv_data;
 248     char host[1024];
 249     int port;
 250
 251     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
 252                  s->filename);
 253     ff_rtsp_undo_setup(s);
 254     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
 255                                       rt->real_challenge);
 256 }
 257
 258 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
 259 {
 260     RTSPState *rt = s->priv_data;
 261     int ret;
 262     RTSPMessageHeader reply1, *reply = &reply1;
 263     char cmd[1024];
 264
 265 retry:
 266     if (rt->server_type == RTSP_SERVER_REAL) {
 267         int i;
 268
 269         for (i = 0; i < s->nb_streams; i++)
 270             rt->real_setup[i] = s->streams[i]->discard;
 271
 272         if (!rt->need_subscription) {
 273             if (memcmp (rt->real_setup, rt->real_setup_cache,
 274                         sizeof(enum AVDiscard) * s->nb_streams)) {
 275                 snprintf(cmd, sizeof(cmd),
 276                          "Unsubscribe: %s\r\n",
 277                          rt->last_subscription);
 278                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 279                                  cmd, reply, NULL);
 280                 if (reply->status_code != RTSP_STATUS_OK)
 281                     return AVERROR_INVALIDDATA;
 282                 rt->need_subscription = 1;
 283             }
 284         }
 285
 286         if (rt->need_subscription) {
 287             int r, rule_nr, first = 1;
 288
 289             memcpy(rt->real_setup_cache, rt->real_setup,
 290                    sizeof(enum AVDiscard) * s->nb_streams);
 291             rt->last_subscription[0] = 0;
 292
 293             snprintf(cmd, sizeof(cmd),
 294                      "Subscribe: ");
 295             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 296                 rule_nr = 0;
 297                 for (r = 0; r < s->nb_streams; r++) {
 298                     if (s->streams[r]->id == i) {
 299                         if (s->streams[r]->discard != AVDISCARD_ALL) {
 300                             if (!first)
 301                                 av_strlcat(rt->last_subscription, ",",
 302                                            sizeof(rt->last_subscription));
 303                             ff_rdt_subscribe_rule(
 304                                 rt->last_subscription,
 305                                 sizeof(rt->last_subscription), i, rule_nr);
 306                             first = 0;
 307                         }
 308                         rule_nr++;
 309                     }
 310                 }
 311             }
 312             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
 313             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 314                              cmd, reply, NULL);
 315             if (reply->status_code != RTSP_STATUS_OK)
 316                 return AVERROR_INVALIDDATA;
 317             rt->need_subscription = 0;
 318
 319             if (rt->state == RTSP_STATE_STREAMING)
 320                 rtsp_read_play (s);
 321         }
 322     }
 323
 324     ret = ff_rtsp_fetch_packet(s, pkt);
 325     if (ret < 0) {
 326         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
 327             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 328                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
 329                 RTSPMessageHeader reply1, *reply = &reply1;
 330                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
 331                 if (rtsp_read_pause(s) != 0)
 332                     return -1;
 333                 // TEARDOWN is required on Real-RTSP, but might make
 334                 // other servers close the connection.
 335                 if (rt->server_type == RTSP_SERVER_REAL)
 336                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
 337                                      reply, NULL);
 338                 rt->session_id[0] = '\0';
 339                 if (resetup_tcp(s) == 0) {
 340                     rt->state = RTSP_STATE_IDLE;
 341                     rt->need_subscription = 1;
 342                     if (rtsp_read_play(s) != 0)
 343                         return -1;
 344                     goto retry;
 345                 }
 346             }
 347         }
 348         return ret;
 349     }
 350     rt->packets++;
 351
 352     /* send dummy request to keep TCP connection alive */
 353     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
 354          rt->auth_state.stale) {
 355         if (rt->server_type == RTSP_SERVER_WMS ||
 356            (rt->server_type != RTSP_SERVER_REAL &&
 357             rt->get_parameter_supported)) {
 358             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
 359         } else {
 360             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
 361         }
 362         /* The stale flag should be reset when creating the auth response in
 363          * ff_rtsp_send_cmd_async, but reset it here just in case we never
 364          * called the auth code (if we didn't have any credentials set). */
 365         rt->auth_state.stale = 0;
 366     }
 367
 368     return 0;
 369 }
 370
 371 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
 372                           int64_t timestamp, int flags)
 373 {
 374     RTSPState *rt = s->priv_data;
 375
 376     rt->seek_timestamp = av_rescale_q(timestamp,
 377                                       s->streams[stream_index]->time_base,
 378                                       AV_TIME_BASE_Q);
 379     switch(rt->state) {
 380     default:
 381     case RTSP_STATE_IDLE:
 382         break;
 383     case RTSP_STATE_STREAMING:
 384         if (rtsp_read_pause(s) != 0)
 385             return -1;
 386         rt->state = RTSP_STATE_SEEKING;
 387         if (rtsp_read_play(s) != 0)
 388             return -1;
 389         break;
 390     case RTSP_STATE_PAUSED:
 391         rt->state = RTSP_STATE_IDLE;
 392         break;
 393     }
 394     return 0;
 395 }
 396
 397 static const AVClass rtsp_demuxer_class = {
 398     .class_name     = "RTSP demuxer",
 399     .item_name      = av_default_item_name,
 400     .option         = ff_rtsp_options,
 401     .version        = LIBAVUTIL_VERSION_INT,
 402 };
 403
 404 AVInputFormat ff_rtsp_demuxer = {
 405     .name           = "rtsp",
 406     .long_name      = NULL_IF_CONFIG_SMALL("RTSP input format"),
 407     .priv_data_size = sizeof(RTSPState),
 408     .read_probe     = rtsp_probe,
 409     .read_header    = rtsp_read_header,
 410     .read_packet    = rtsp_read_packet,
 411     .read_close     = rtsp_read_close,
 412     .read_seek      = rtsp_read_seek,
 413     .flags          = AVFMT_NOFILE,
 414     .read_play      = rtsp_read_play,
 415     .read_pause     = rtsp_read_pause,
 416     .priv_class     = &rtsp_demuxer_class,
 417 };