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 "libavutil/opt.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 //#define DEBUG
  35 //#define DEBUG_RTP_TCP
  36
  37 static int rtsp_read_play(AVFormatContext *s)
  38 {
  39     RTSPState *rt = s->priv_data;
  40     RTSPMessageHeader reply1, *reply = &reply1;
  41     int i;
  42     char cmd[1024];
  43
  44     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
  45     rt->nb_byes = 0;
  46
  47     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
  48         if (rt->transport == RTSP_TRANSPORT_RTP) {
  49             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  50                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  51                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  52                 if (!rtpctx)
  53                     continue;
  54                 ff_rtp_reset_packet_queue(rtpctx);
  55                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
  56                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
  57                 rtpctx->base_timestamp      = 0;
  58                 rtpctx->rtcp_ts_offset      = 0;
  59             }
  60         }
  61         if (rt->state == RTSP_STATE_PAUSED) {
  62             cmd[0] = 0;
  63         } else {
  64             snprintf(cmd, sizeof(cmd),
  65                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
  66                      rt->seek_timestamp / AV_TIME_BASE,
  67                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
  68         }
  69         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
  70         if (reply->status_code != RTSP_STATUS_OK) {
  71             return -1;
  72         }
  73         if (rt->transport == RTSP_TRANSPORT_RTP &&
  74             reply->range_start != AV_NOPTS_VALUE) {
  75             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  76                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  77                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  78                 AVStream *st = NULL;
  79                 if (!rtpctx || rtsp_st->stream_index < 0)
  80                     continue;
  81                 st = s->streams[rtsp_st->stream_index];
  82                 rtpctx->range_start_offset =
  83                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
  84                                  st->time_base);
  85             }
  86         }
  87     }
  88     rt->state = RTSP_STATE_STREAMING;
  89     return 0;
  90 }
  91
  92 /* pause the stream */
  93 static int rtsp_read_pause(AVFormatContext *s)
  94 {
  95     RTSPState *rt = s->priv_data;
  96     RTSPMessageHeader reply1, *reply = &reply1;
  97
  98     if (rt->state != RTSP_STATE_STREAMING)
  99         return 0;
 100     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
 101         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
 102         if (reply->status_code != RTSP_STATUS_OK) {
 103             return -1;
 104         }
 105     }
 106     rt->state = RTSP_STATE_PAUSED;
 107     return 0;
 108 }
 109
 110 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
 111 {
 112     RTSPState *rt = s->priv_data;
 113     char cmd[1024];
 114     unsigned char *content = NULL;
 115     int ret;
 116
 117     /* describe the stream */
 118     snprintf(cmd, sizeof(cmd),
 119              "Accept: application/sdp\r\n");
 120     if (rt->server_type == RTSP_SERVER_REAL) {
 121         /**
 122          * The Require: attribute is needed for proper streaming from
 123          * Realmedia servers.
 124          */
 125         av_strlcat(cmd,
 126                    "Require: com.real.retain-entity-for-setup\r\n",
 127                    sizeof(cmd));
 128     }
 129     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
 130     if (!content)
 131         return AVERROR_INVALIDDATA;
 132     if (reply->status_code != RTSP_STATUS_OK) {
 133         av_freep(&content);
 134         return AVERROR_INVALIDDATA;
 135     }
 136
 137     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
 138     /* now we got the SDP description, we parse it */
 139     ret = ff_sdp_parse(s, (const char *)content);
 140     av_freep(&content);
 141     if (ret < 0)
 142         return ret;
 143
 144     return 0;
 145 }
 146
 147 static int rtsp_probe(AVProbeData *p)
 148 {
 149     if (av_strstart(p->filename, "rtsp:", NULL))
 150         return AVPROBE_SCORE_MAX;
 151     return 0;
 152 }
 153
 154 static int rtsp_read_header(AVFormatContext *s,
 155                             AVFormatParameters *ap)
 156 {
 157     RTSPState *rt = s->priv_data;
 158     int ret;
 159
 160     ret = ff_rtsp_connect(s);
 161     if (ret)
 162         return ret;
 163
 164     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
 165     if (!rt->real_setup_cache)
 166         return AVERROR(ENOMEM);
 167     rt->real_setup = rt->real_setup_cache + s->nb_streams;
 168
 169 #if FF_API_FORMAT_PARAMETERS
 170     if (ap->initial_pause)
 171         rt->initial_pause = ap->initial_pause;
 172 #endif
 173
 174     if (rt->initial_pause) {
 175          /* do not start immediately */
 176     } else {
 177          if (rtsp_read_play(s) < 0) {
 178             ff_rtsp_close_streams(s);
 179             ff_rtsp_close_connections(s);
 180             return AVERROR_INVALIDDATA;
 181         }
 182     }
 183
 184     return 0;
 185 }
 186
 187 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
 188                             uint8_t *buf, int buf_size)
 189 {
 190     RTSPState *rt = s->priv_data;
 191     int id, len, i, ret;
 192     RTSPStream *rtsp_st;
 193
 194 #ifdef DEBUG_RTP_TCP
 195     av_dlog(s, "tcp_read_packet:\n");
 196 #endif
 197 redo:
 198     for (;;) {
 199         RTSPMessageHeader reply;
 200
 201         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
 202         if (ret < 0)
 203             return ret;
 204         if (ret == 1) /* received '$' */
 205             break;
 206         /* XXX: parse message */
 207         if (rt->state != RTSP_STATE_STREAMING)
 208             return 0;
 209     }
 210     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
 211     if (ret != 3)
 212         return -1;
 213     id  = buf[0];
 214     len = AV_RB16(buf + 1);
 215 #ifdef DEBUG_RTP_TCP
 216     av_dlog(s, "id=%d len=%d\n", id, len);
 217 #endif
 218     if (len > buf_size || len < 12)
 219         goto redo;
 220     /* get the data */
 221     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
 222     if (ret != len)
 223         return -1;
 224     if (rt->transport == RTSP_TRANSPORT_RDT &&
 225         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
 226         return -1;
 227
 228     /* find the matching stream */
 229     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 230         rtsp_st = rt->rtsp_streams[i];
 231         if (id >= rtsp_st->interleaved_min &&
 232             id <= rtsp_st->interleaved_max)
 233             goto found;
 234     }
 235     goto redo;
 236 found:
 237     *prtsp_st = rtsp_st;
 238     return len;
 239 }
 240
 241 static int resetup_tcp(AVFormatContext *s)
 242 {
 243     RTSPState *rt = s->priv_data;
 244     char host[1024];
 245     int port;
 246
 247     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
 248                  s->filename);
 249     ff_rtsp_undo_setup(s);
 250     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
 251                                       rt->real_challenge);
 252 }
 253
 254 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
 255 {
 256     RTSPState *rt = s->priv_data;
 257     int ret;
 258     RTSPMessageHeader reply1, *reply = &reply1;
 259     char cmd[1024];
 260
 261 retry:
 262     if (rt->server_type == RTSP_SERVER_REAL) {
 263         int i;
 264
 265         for (i = 0; i < s->nb_streams; i++)
 266             rt->real_setup[i] = s->streams[i]->discard;
 267
 268         if (!rt->need_subscription) {
 269             if (memcmp (rt->real_setup, rt->real_setup_cache,
 270                         sizeof(enum AVDiscard) * s->nb_streams)) {
 271                 snprintf(cmd, sizeof(cmd),
 272                          "Unsubscribe: %s\r\n",
 273                          rt->last_subscription);
 274                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 275                                  cmd, reply, NULL);
 276                 if (reply->status_code != RTSP_STATUS_OK)
 277                     return AVERROR_INVALIDDATA;
 278                 rt->need_subscription = 1;
 279             }
 280         }
 281
 282         if (rt->need_subscription) {
 283             int r, rule_nr, first = 1;
 284
 285             memcpy(rt->real_setup_cache, rt->real_setup,
 286                    sizeof(enum AVDiscard) * s->nb_streams);
 287             rt->last_subscription[0] = 0;
 288
 289             snprintf(cmd, sizeof(cmd),
 290                      "Subscribe: ");
 291             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 292                 rule_nr = 0;
 293                 for (r = 0; r < s->nb_streams; r++) {
 294                     if (s->streams[r]->id == i) {
 295                         if (s->streams[r]->discard != AVDISCARD_ALL) {
 296                             if (!first)
 297                                 av_strlcat(rt->last_subscription, ",",
 298                                            sizeof(rt->last_subscription));
 299                             ff_rdt_subscribe_rule(
 300                                 rt->last_subscription,
 301                                 sizeof(rt->last_subscription), i, rule_nr);
 302                             first = 0;
 303                         }
 304                         rule_nr++;
 305                     }
 306                 }
 307             }
 308             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
 309             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 310                              cmd, reply, NULL);
 311             if (reply->status_code != RTSP_STATUS_OK)
 312                 return AVERROR_INVALIDDATA;
 313             rt->need_subscription = 0;
 314
 315             if (rt->state == RTSP_STATE_STREAMING)
 316                 rtsp_read_play (s);
 317         }
 318     }
 319
 320     ret = ff_rtsp_fetch_packet(s, pkt);
 321     if (ret < 0) {
 322         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
 323             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 324                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
 325                 RTSPMessageHeader reply1, *reply = &reply1;
 326                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
 327                 if (rtsp_read_pause(s) != 0)
 328                     return -1;
 329                 // TEARDOWN is required on Real-RTSP, but might make
 330                 // other servers close the connection.
 331                 if (rt->server_type == RTSP_SERVER_REAL)
 332                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
 333                                      reply, NULL);
 334                 rt->session_id[0] = '\0';
 335                 if (resetup_tcp(s) == 0) {
 336                     rt->state = RTSP_STATE_IDLE;
 337                     rt->need_subscription = 1;
 338                     if (rtsp_read_play(s) != 0)
 339                         return -1;
 340                     goto retry;
 341                 }
 342             }
 343         }
 344         return ret;
 345     }
 346     rt->packets++;
 347
 348     /* send dummy request to keep TCP connection alive */
 349     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
 350         if (rt->server_type == RTSP_SERVER_WMS ||
 351            (rt->server_type != RTSP_SERVER_REAL &&
 352             rt->get_parameter_supported)) {
 353             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
 354         } else {
 355             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
 356         }
 357     }
 358
 359     return 0;
 360 }
 361
 362 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
 363                           int64_t timestamp, int flags)
 364 {
 365     RTSPState *rt = s->priv_data;
 366
 367     rt->seek_timestamp = av_rescale_q(timestamp,
 368                                       s->streams[stream_index]->time_base,
 369                                       AV_TIME_BASE_Q);
 370     switch(rt->state) {
 371     default:
 372     case RTSP_STATE_IDLE:
 373         break;
 374     case RTSP_STATE_STREAMING:
 375         if (rtsp_read_pause(s) != 0)
 376             return -1;
 377         rt->state = RTSP_STATE_SEEKING;
 378         if (rtsp_read_play(s) != 0)
 379             return -1;
 380         break;
 381     case RTSP_STATE_PAUSED:
 382         rt->state = RTSP_STATE_IDLE;
 383         break;
 384     }
 385     return 0;
 386 }
 387
 388 static int rtsp_read_close(AVFormatContext *s)
 389 {
 390     RTSPState *rt = s->priv_data;
 391
 392 #if 0
 393     /* NOTE: it is valid to flush the buffer here */
 394     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 395         avio_close(&rt->rtsp_gb);
 396     }
 397 #endif
 398     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
 399
 400     ff_rtsp_close_streams(s);
 401     ff_rtsp_close_connections(s);
 402     ff_network_close();
 403     rt->real_setup = NULL;
 404     av_freep(&rt->real_setup_cache);
 405     return 0;
 406 }
 407
 408 static const AVOption options[] = {
 409     { "initial_pause",  "Don't start playing the stream immediately", offsetof(RTSPState, initial_pause),  FF_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
 410     { NULL },
 411 };
 412
 413 const AVClass rtsp_demuxer_class = {
 414     .class_name     = "RTSP demuxer",
 415     .item_name      = av_default_item_name,
 416     .option         = options,
 417     .version        = LIBAVUTIL_VERSION_INT,
 418 };
 419
 420 AVInputFormat ff_rtsp_demuxer = {
 421     "rtsp",
 422     NULL_IF_CONFIG_SMALL("RTSP input format"),
 423     sizeof(RTSPState),
 424     rtsp_probe,
 425     rtsp_read_header,
 426     rtsp_read_packet,
 427     rtsp_read_close,
 428     rtsp_read_seek,
 429     .flags = AVFMT_NOFILE,
 430     .read_play = rtsp_read_play,
 431     .read_pause = rtsp_read_pause,
 432     .priv_class = &rtsp_demuxer_class,
 433 };