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 FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/intreadwrite.h"
  24 #include "avformat.h"
  25
  26 #include "internal.h"
  27 #include "network.h"
  28 #include "os_support.h"
  29 #include "rtsp.h"
  30 #include "rdt.h"
  31
  32 //#define DEBUG
  33 //#define DEBUG_RTP_TCP
  34
  35 static int rtsp_read_play(AVFormatContext *s)
  36 {
  37     RTSPState *rt = s->priv_data;
  38     RTSPMessageHeader reply1, *reply = &reply1;
  39     int i;
  40     char cmd[1024];
  41
  42     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
  43     rt->nb_byes = 0;
  44
  45     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
  46         if (rt->transport == RTSP_TRANSPORT_RTP) {
  47             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  48                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  49                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  50                 if (!rtpctx)
  51                     continue;
  52                 ff_rtp_reset_packet_queue(rtpctx);
  53                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
  54                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
  55                 rtpctx->base_timestamp      = 0;
  56                 rtpctx->rtcp_ts_offset      = 0;
  57             }
  58         }
  59         if (rt->state == RTSP_STATE_PAUSED) {
  60             cmd[0] = 0;
  61         } else {
  62             if (!rt->seek_timestamp) {
  63                 snprintf(cmd, sizeof(cmd), "Range: npt=0.000-\r\n");
  64             } else {
  65                 snprintf(cmd, sizeof(cmd),
  66                          "Range: npt=%"PRId64".%03"PRId64"-\r\n",
  67                          rt->seek_timestamp / AV_TIME_BASE,
  68                          rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
  69             }
  70         }
  71         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
  72         if (reply->status_code != RTSP_STATUS_OK) {
  73             return -1;
  74         }
  75         if (rt->transport == RTSP_TRANSPORT_RTP &&
  76             reply->range_start != AV_NOPTS_VALUE) {
  77             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  78                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  79                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  80                 AVStream *st = NULL;
  81                 if (!rtpctx || rtsp_st->stream_index < 0)
  82                     continue;
  83                 st = s->streams[rtsp_st->stream_index];
  84                 rtpctx->range_start_offset =
  85                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
  86                                  st->time_base);
  87             }
  88         }
  89     }
  90     rt->state = RTSP_STATE_STREAMING;
  91     return 0;
  92 }
  93
  94 /* pause the stream */
  95 static int rtsp_read_pause(AVFormatContext *s)
  96 {
  97     RTSPState *rt = s->priv_data;
  98     RTSPMessageHeader reply1, *reply = &reply1;
  99
 100     if (rt->state != RTSP_STATE_STREAMING)
 101         return 0;
 102     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
 103         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
 104         if (reply->status_code != RTSP_STATUS_OK) {
 105             return -1;
 106         }
 107     }
 108     rt->state = RTSP_STATE_PAUSED;
 109     return 0;
 110 }
 111
 112 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
 113 {
 114     RTSPState *rt = s->priv_data;
 115     char cmd[1024];
 116     unsigned char *content = NULL;
 117     int ret;
 118
 119     /* describe the stream */
 120     snprintf(cmd, sizeof(cmd),
 121              "Accept: application/sdp\r\n");
 122     if (rt->server_type == RTSP_SERVER_REAL) {
 123         /**
 124          * The Require: attribute is needed for proper streaming from
 125          * Realmedia servers.
 126          */
 127         av_strlcat(cmd,
 128                    "Require: com.real.retain-entity-for-setup\r\n",
 129                    sizeof(cmd));
 130     }
 131     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
 132     if (!content)
 133         return AVERROR_INVALIDDATA;
 134     if (reply->status_code != RTSP_STATUS_OK) {
 135         av_freep(&content);
 136         return AVERROR_INVALIDDATA;
 137     }
 138
 139     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
 140     /* now we got the SDP description, we parse it */
 141     ret = ff_sdp_parse(s, (const char *)content);
 142     av_freep(&content);
 143     if (ret < 0)
 144         return ret;
 145
 146     return 0;
 147 }
 148
 149 static int rtsp_probe(AVProbeData *p)
 150 {
 151     if (av_strstart(p->filename, "rtsp:", NULL))
 152         return AVPROBE_SCORE_MAX;
 153     return 0;
 154 }
 155
 156 static int rtsp_read_header(AVFormatContext *s,
 157                             AVFormatParameters *ap)
 158 {
 159     RTSPState *rt = s->priv_data;
 160     int ret;
 161
 162     ret = ff_rtsp_connect(s);
 163     if (ret)
 164         return ret;
 165
 166     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
 167     if (!rt->real_setup_cache)
 168         return AVERROR(ENOMEM);
 169     rt->real_setup = rt->real_setup_cache + s->nb_streams;
 170
 171     if (ap->initial_pause) {
 172          /* do not start immediately */
 173     } else {
 174          if (rtsp_read_play(s) < 0) {
 175             ff_rtsp_close_streams(s);
 176             ff_rtsp_close_connections(s);
 177             return AVERROR_INVALIDDATA;
 178         }
 179     }
 180
 181     return 0;
 182 }
 183
 184 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
 185                             uint8_t *buf, int buf_size)
 186 {
 187     RTSPState *rt = s->priv_data;
 188     int id, len, i, ret;
 189     RTSPStream *rtsp_st;
 190
 191 #ifdef DEBUG_RTP_TCP
 192     av_dlog(s, "tcp_read_packet:\n");
 193 #endif
 194 redo:
 195     for (;;) {
 196         RTSPMessageHeader reply;
 197
 198         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
 199         if (ret < 0)
 200             return ret;
 201         if (ret == 1) /* received '$' */
 202             break;
 203         /* XXX: parse message */
 204         if (rt->state != RTSP_STATE_STREAMING)
 205             return 0;
 206     }
 207     ret = url_read_complete(rt->rtsp_hd, buf, 3);
 208     if (ret != 3)
 209         return -1;
 210     id  = buf[0];
 211     len = AV_RB16(buf + 1);
 212 #ifdef DEBUG_RTP_TCP
 213     av_dlog(s, "id=%d len=%d\n", id, len);
 214 #endif
 215     if (len > buf_size || len < 12)
 216         goto redo;
 217     /* get the data */
 218     ret = url_read_complete(rt->rtsp_hd, buf, len);
 219     if (ret != len)
 220         return -1;
 221     if (rt->transport == RTSP_TRANSPORT_RDT &&
 222         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
 223         return -1;
 224
 225     /* find the matching stream */
 226     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 227         rtsp_st = rt->rtsp_streams[i];
 228         if (id >= rtsp_st->interleaved_min &&
 229             id <= rtsp_st->interleaved_max)
 230             goto found;
 231     }
 232     goto redo;
 233 found:
 234     *prtsp_st = rtsp_st;
 235     return len;
 236 }
 237
 238 static int resetup_tcp(AVFormatContext *s)
 239 {
 240     RTSPState *rt = s->priv_data;
 241     char host[1024];
 242     int port;
 243
 244     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
 245                  s->filename);
 246     ff_rtsp_undo_setup(s);
 247     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
 248                                       rt->real_challenge);
 249 }
 250
 251 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
 252 {
 253     RTSPState *rt = s->priv_data;
 254     int ret;
 255     RTSPMessageHeader reply1, *reply = &reply1;
 256     char cmd[1024];
 257
 258 retry:
 259     if (rt->server_type == RTSP_SERVER_REAL) {
 260         int i;
 261
 262         for (i = 0; i < s->nb_streams; i++)
 263             rt->real_setup[i] = s->streams[i]->discard;
 264
 265         if (!rt->need_subscription) {
 266             if (memcmp (rt->real_setup, rt->real_setup_cache,
 267                         sizeof(enum AVDiscard) * s->nb_streams)) {
 268                 snprintf(cmd, sizeof(cmd),
 269                          "Unsubscribe: %s\r\n",
 270                          rt->last_subscription);
 271                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 272                                  cmd, reply, NULL);
 273                 if (reply->status_code != RTSP_STATUS_OK)
 274                     return AVERROR_INVALIDDATA;
 275                 rt->need_subscription = 1;
 276             }
 277         }
 278
 279         if (rt->need_subscription) {
 280             int r, rule_nr, first = 1;
 281
 282             memcpy(rt->real_setup_cache, rt->real_setup,
 283                    sizeof(enum AVDiscard) * s->nb_streams);
 284             rt->last_subscription[0] = 0;
 285
 286             snprintf(cmd, sizeof(cmd),
 287                      "Subscribe: ");
 288             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 289                 rule_nr = 0;
 290                 for (r = 0; r < s->nb_streams; r++) {
 291                     if (s->streams[r]->id == i) {
 292                         if (s->streams[r]->discard != AVDISCARD_ALL) {
 293                             if (!first)
 294                                 av_strlcat(rt->last_subscription, ",",
 295                                            sizeof(rt->last_subscription));
 296                             ff_rdt_subscribe_rule(
 297                                 rt->last_subscription,
 298                                 sizeof(rt->last_subscription), i, rule_nr);
 299                             first = 0;
 300                         }
 301                         rule_nr++;
 302                     }
 303                 }
 304             }
 305             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
 306             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 307                              cmd, reply, NULL);
 308             if (reply->status_code != RTSP_STATUS_OK)
 309                 return AVERROR_INVALIDDATA;
 310             rt->need_subscription = 0;
 311
 312             if (rt->state == RTSP_STATE_STREAMING)
 313                 rtsp_read_play (s);
 314         }
 315     }
 316
 317     ret = ff_rtsp_fetch_packet(s, pkt);
 318     if (ret < 0) {
 319         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
 320             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 321                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
 322                 RTSPMessageHeader reply1, *reply = &reply1;
 323                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
 324                 if (rtsp_read_pause(s) != 0)
 325                     return -1;
 326                 // TEARDOWN is required on Real-RTSP, but might make
 327                 // other servers close the connection.
 328                 if (rt->server_type == RTSP_SERVER_REAL)
 329                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
 330                                      reply, NULL);
 331                 rt->session_id[0] = '\0';
 332                 if (resetup_tcp(s) == 0) {
 333                     rt->state = RTSP_STATE_IDLE;
 334                     rt->need_subscription = 1;
 335                     if (rtsp_read_play(s) != 0)
 336                         return -1;
 337                     goto retry;
 338                 }
 339             }
 340         }
 341         return ret;
 342     }
 343     rt->packets++;
 344
 345     /* send dummy request to keep TCP connection alive */
 346     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
 347         if (rt->server_type == RTSP_SERVER_WMS) {
 348             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
 349         } else {
 350             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
 351         }
 352     }
 353
 354     return 0;
 355 }
 356
 357 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
 358                           int64_t timestamp, int flags)
 359 {
 360     RTSPState *rt = s->priv_data;
 361
 362     rt->seek_timestamp = av_rescale_q(timestamp,
 363                                       s->streams[stream_index]->time_base,
 364                                       AV_TIME_BASE_Q);
 365     switch(rt->state) {
 366     default:
 367     case RTSP_STATE_IDLE:
 368         break;
 369     case RTSP_STATE_STREAMING:
 370         if (rtsp_read_pause(s) != 0)
 371             return -1;
 372         rt->state = RTSP_STATE_SEEKING;
 373         if (rtsp_read_play(s) != 0)
 374             return -1;
 375         break;
 376     case RTSP_STATE_PAUSED:
 377         rt->state = RTSP_STATE_IDLE;
 378         break;
 379     }
 380     return 0;
 381 }
 382
 383 static int rtsp_read_close(AVFormatContext *s)
 384 {
 385     RTSPState *rt = s->priv_data;
 386
 387 #if 0
 388     /* NOTE: it is valid to flush the buffer here */
 389     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 390         avio_close(&rt->rtsp_gb);
 391     }
 392 #endif
 393     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
 394
 395     ff_rtsp_close_streams(s);
 396     ff_rtsp_close_connections(s);
 397     ff_network_close();
 398     rt->real_setup = NULL;
 399     av_freep(&rt->real_setup_cache);
 400     return 0;
 401 }
 402
 403 AVInputFormat ff_rtsp_demuxer = {
 404     "rtsp",
 405     NULL_IF_CONFIG_SMALL("RTSP input format"),
 406     sizeof(RTSPState),
 407     rtsp_probe,
 408     rtsp_read_header,
 409     rtsp_read_packet,
 410     rtsp_read_close,
 411     rtsp_read_seek,
 412     .flags = AVFMT_NOFILE,
 413     .read_play = rtsp_read_play,
 414     .read_pause = rtsp_read_pause,
 415 };