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