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 "libavutil/opt.h"
  26 #include "avformat.h"
  27
  28 #include "internal.h"
  29 #include "network.h"
  30 #include "os_support.h"
  31 #include "rtsp.h"
  32 #include "rdt.h"
  33 #include "url.h"
  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             snprintf(cmd, sizeof(cmd),
  63                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
  64                      rt->seek_timestamp / AV_TIME_BASE,
  65                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
  66         }
  67         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
  68         if (reply->status_code != RTSP_STATUS_OK) {
  69             return -1;
  70         }
  71         if (rt->transport == RTSP_TRANSPORT_RTP &&
  72             reply->range_start != AV_NOPTS_VALUE) {
  73             for (i = 0; i < rt->nb_rtsp_streams; i++) {
  74                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
  75                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
  76                 AVStream *st = NULL;
  77                 if (!rtpctx || rtsp_st->stream_index < 0)
  78                     continue;
  79                 st = s->streams[rtsp_st->stream_index];
  80                 rtpctx->range_start_offset =
  81                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
  82                                  st->time_base);
  83             }
  84         }
  85     }
  86     rt->state = RTSP_STATE_STREAMING;
  87     return 0;
  88 }
  89
  90 /* pause the stream */
  91 static int rtsp_read_pause(AVFormatContext *s)
  92 {
  93     RTSPState *rt = s->priv_data;
  94     RTSPMessageHeader reply1, *reply = &reply1;
  95
  96     if (rt->state != RTSP_STATE_STREAMING)
  97         return 0;
  98     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
  99         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
 100         if (reply->status_code != RTSP_STATUS_OK) {
 101             return -1;
 102         }
 103     }
 104     rt->state = RTSP_STATE_PAUSED;
 105     return 0;
 106 }
 107
 108 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
 109 {
 110     RTSPState *rt = s->priv_data;
 111     char cmd[1024];
 112     unsigned char *content = NULL;
 113     int ret;
 114
 115     /* describe the stream */
 116     snprintf(cmd, sizeof(cmd),
 117              "Accept: application/sdp\r\n");
 118     if (rt->server_type == RTSP_SERVER_REAL) {
 119         /**
 120          * The Require: attribute is needed for proper streaming from
 121          * Realmedia servers.
 122          */
 123         av_strlcat(cmd,
 124                    "Require: com.real.retain-entity-for-setup\r\n",
 125                    sizeof(cmd));
 126     }
 127     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
 128     if (!content)
 129         return AVERROR_INVALIDDATA;
 130     if (reply->status_code != RTSP_STATUS_OK) {
 131         av_freep(&content);
 132         return AVERROR_INVALIDDATA;
 133     }
 134
 135     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
 136     /* now we got the SDP description, we parse it */
 137     ret = ff_sdp_parse(s, (const char *)content);
 138     av_freep(&content);
 139     if (ret < 0)
 140         return ret;
 141
 142     return 0;
 143 }
 144
 145 static int rtsp_probe(AVProbeData *p)
 146 {
 147     if (av_strstart(p->filename, "rtsp:", NULL))
 148         return AVPROBE_SCORE_MAX;
 149     return 0;
 150 }
 151
 152 static int rtsp_read_header(AVFormatContext *s,
 153                             AVFormatParameters *ap)
 154 {
 155     RTSPState *rt = s->priv_data;
 156     int ret;
 157
 158     ret = ff_rtsp_connect(s);
 159     if (ret)
 160         return ret;
 161
 162     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
 163     if (!rt->real_setup_cache)
 164         return AVERROR(ENOMEM);
 165     rt->real_setup = rt->real_setup_cache + s->nb_streams;
 166
 167 #if FF_API_FORMAT_PARAMETERS
 168     if (ap->initial_pause)
 169         rt->initial_pause = ap->initial_pause;
 170 #endif
 171
 172     if (rt->initial_pause) {
 173          /* do not start immediately */
 174     } else {
 175          if (rtsp_read_play(s) < 0) {
 176             ff_rtsp_close_streams(s);
 177             ff_rtsp_close_connections(s);
 178             return AVERROR_INVALIDDATA;
 179         }
 180     }
 181
 182     return 0;
 183 }
 184
 185 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
 186                             uint8_t *buf, int buf_size)
 187 {
 188     RTSPState *rt = s->priv_data;
 189     int id, len, i, ret;
 190     RTSPStream *rtsp_st;
 191
 192     av_dlog(s, "tcp_read_packet:\n");
 193 redo:
 194     for (;;) {
 195         RTSPMessageHeader reply;
 196
 197         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
 198         if (ret < 0)
 199             return ret;
 200         if (ret == 1) /* received '$' */
 201             break;
 202         /* XXX: parse message */
 203         if (rt->state != RTSP_STATE_STREAMING)
 204             return 0;
 205     }
 206     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
 207     if (ret != 3)
 208         return -1;
 209     id  = buf[0];
 210     len = AV_RB16(buf + 1);
 211     av_dlog(s, "id=%d len=%d\n", id, len);
 212     if (len > buf_size || len < 12)
 213         goto redo;
 214     /* get the data */
 215     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
 216     if (ret != len)
 217         return -1;
 218     if (rt->transport == RTSP_TRANSPORT_RDT &&
 219         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
 220         return -1;
 221
 222     /* find the matching stream */
 223     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 224         rtsp_st = rt->rtsp_streams[i];
 225         if (id >= rtsp_st->interleaved_min &&
 226             id <= rtsp_st->interleaved_max)
 227             goto found;
 228     }
 229     goto redo;
 230 found:
 231     *prtsp_st = rtsp_st;
 232     return len;
 233 }
 234
 235 static int resetup_tcp(AVFormatContext *s)
 236 {
 237     RTSPState *rt = s->priv_data;
 238     char host[1024];
 239     int port;
 240
 241     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
 242                  s->filename);
 243     ff_rtsp_undo_setup(s);
 244     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
 245                                       rt->real_challenge);
 246 }
 247
 248 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
 249 {
 250     RTSPState *rt = s->priv_data;
 251     int ret;
 252     RTSPMessageHeader reply1, *reply = &reply1;
 253     char cmd[1024];
 254
 255 retry:
 256     if (rt->server_type == RTSP_SERVER_REAL) {
 257         int i;
 258
 259         for (i = 0; i < s->nb_streams; i++)
 260             rt->real_setup[i] = s->streams[i]->discard;
 261
 262         if (!rt->need_subscription) {
 263             if (memcmp (rt->real_setup, rt->real_setup_cache,
 264                         sizeof(enum AVDiscard) * s->nb_streams)) {
 265                 snprintf(cmd, sizeof(cmd),
 266                          "Unsubscribe: %s\r\n",
 267                          rt->last_subscription);
 268                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 269                                  cmd, reply, NULL);
 270                 if (reply->status_code != RTSP_STATUS_OK)
 271                     return AVERROR_INVALIDDATA;
 272                 rt->need_subscription = 1;
 273             }
 274         }
 275
 276         if (rt->need_subscription) {
 277             int r, rule_nr, first = 1;
 278
 279             memcpy(rt->real_setup_cache, rt->real_setup,
 280                    sizeof(enum AVDiscard) * s->nb_streams);
 281             rt->last_subscription[0] = 0;
 282
 283             snprintf(cmd, sizeof(cmd),
 284                      "Subscribe: ");
 285             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 286                 rule_nr = 0;
 287                 for (r = 0; r < s->nb_streams; r++) {
 288                     if (s->streams[r]->id == i) {
 289                         if (s->streams[r]->discard != AVDISCARD_ALL) {
 290                             if (!first)
 291                                 av_strlcat(rt->last_subscription, ",",
 292                                            sizeof(rt->last_subscription));
 293                             ff_rdt_subscribe_rule(
 294                                 rt->last_subscription,
 295                                 sizeof(rt->last_subscription), i, rule_nr);
 296                             first = 0;
 297                         }
 298                         rule_nr++;
 299                     }
 300                 }
 301             }
 302             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
 303             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 304                              cmd, reply, NULL);
 305             if (reply->status_code != RTSP_STATUS_OK)
 306                 return AVERROR_INVALIDDATA;
 307             rt->need_subscription = 0;
 308
 309             if (rt->state == RTSP_STATE_STREAMING)
 310                 rtsp_read_play (s);
 311         }
 312     }
 313
 314     ret = ff_rtsp_fetch_packet(s, pkt);
 315     if (ret < 0) {
 316         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
 317             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 318                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
 319                 RTSPMessageHeader reply1, *reply = &reply1;
 320                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
 321                 if (rtsp_read_pause(s) != 0)
 322                     return -1;
 323                 // TEARDOWN is required on Real-RTSP, but might make
 324                 // other servers close the connection.
 325                 if (rt->server_type == RTSP_SERVER_REAL)
 326                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
 327                                      reply, NULL);
 328                 rt->session_id[0] = '\0';
 329                 if (resetup_tcp(s) == 0) {
 330                     rt->state = RTSP_STATE_IDLE;
 331                     rt->need_subscription = 1;
 332                     if (rtsp_read_play(s) != 0)
 333                         return -1;
 334                     goto retry;
 335                 }
 336             }
 337         }
 338         return ret;
 339     }
 340     rt->packets++;
 341
 342     /* send dummy request to keep TCP connection alive */
 343     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
 344         if (rt->server_type == RTSP_SERVER_WMS ||
 345            (rt->server_type != RTSP_SERVER_REAL &&
 346             rt->get_parameter_supported)) {
 347             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
 348         } else {
 349             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
 350         }
 351     }
 352
 353     return 0;
 354 }
 355
 356 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
 357                           int64_t timestamp, int flags)
 358 {
 359     RTSPState *rt = s->priv_data;
 360
 361     rt->seek_timestamp = av_rescale_q(timestamp,
 362                                       s->streams[stream_index]->time_base,
 363                                       AV_TIME_BASE_Q);
 364     switch(rt->state) {
 365     default:
 366     case RTSP_STATE_IDLE:
 367         break;
 368     case RTSP_STATE_STREAMING:
 369         if (rtsp_read_pause(s) != 0)
 370             return -1;
 371         rt->state = RTSP_STATE_SEEKING;
 372         if (rtsp_read_play(s) != 0)
 373             return -1;
 374         break;
 375     case RTSP_STATE_PAUSED:
 376         rt->state = RTSP_STATE_IDLE;
 377         break;
 378     }
 379     return 0;
 380 }
 381
 382 static int rtsp_read_close(AVFormatContext *s)
 383 {
 384     RTSPState *rt = s->priv_data;
 385
 386 #if 0
 387     /* NOTE: it is valid to flush the buffer here */
 388     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 389         avio_close(&rt->rtsp_gb);
 390     }
 391 #endif
 392     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
 393
 394     ff_rtsp_close_streams(s);
 395     ff_rtsp_close_connections(s);
 396     ff_network_close();
 397     rt->real_setup = NULL;
 398     av_freep(&rt->real_setup_cache);
 399     return 0;
 400 }
 401
 402 static const AVOption options[] = {
 403     { "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 },
 404     { NULL },
 405 };
 406
 407 const AVClass rtsp_demuxer_class = {
 408     .class_name     = "RTSP demuxer",
 409     .item_name      = av_default_item_name,
 410     .option         = options,
 411     .version        = LIBAVUTIL_VERSION_INT,
 412 };
 413
 414 AVInputFormat ff_rtsp_demuxer = {
 415     "rtsp",
 416     NULL_IF_CONFIG_SMALL("RTSP input format"),
 417     sizeof(RTSPState),
 418     rtsp_probe,
 419     rtsp_read_header,
 420     rtsp_read_packet,
 421     rtsp_read_close,
 422     rtsp_read_seek,
 423     .flags = AVFMT_NOFILE,
 424     .read_play = rtsp_read_play,
 425     .read_pause = rtsp_read_pause,
 426     .priv_class = &rtsp_demuxer_class,
 427 };