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 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 FF_API_FORMAT_PARAMETERS
 167     if (ap->initial_pause)
 168         rt->initial_pause = ap->initial_pause;
 169 #endif
 170
 171     if (rt->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     av_dlog(s, "tcp_read_packet:\n");
 192 redo:
 193     for (;;) {
 194         RTSPMessageHeader reply;
 195
 196         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
 197         if (ret < 0)
 198             return ret;
 199         if (ret == 1) /* received '$' */
 200             break;
 201         /* XXX: parse message */
 202         if (rt->state != RTSP_STATE_STREAMING)
 203             return 0;
 204     }
 205     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
 206     if (ret != 3)
 207         return -1;
 208     id  = buf[0];
 209     len = AV_RB16(buf + 1);
 210     av_dlog(s, "id=%d len=%d\n", id, len);
 211     if (len > buf_size || len < 12)
 212         goto redo;
 213     /* get the data */
 214     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
 215     if (ret != len)
 216         return -1;
 217     if (rt->transport == RTSP_TRANSPORT_RDT &&
 218         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
 219         return -1;
 220
 221     /* find the matching stream */
 222     for (i = 0; i < rt->nb_rtsp_streams; i++) {
 223         rtsp_st = rt->rtsp_streams[i];
 224         if (id >= rtsp_st->interleaved_min &&
 225             id <= rtsp_st->interleaved_max)
 226             goto found;
 227     }
 228     goto redo;
 229 found:
 230     *prtsp_st = rtsp_st;
 231     return len;
 232 }
 233
 234 static int resetup_tcp(AVFormatContext *s)
 235 {
 236     RTSPState *rt = s->priv_data;
 237     char host[1024];
 238     int port;
 239
 240     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
 241                  s->filename);
 242     ff_rtsp_undo_setup(s);
 243     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
 244                                       rt->real_challenge);
 245 }
 246
 247 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
 248 {
 249     RTSPState *rt = s->priv_data;
 250     int ret;
 251     RTSPMessageHeader reply1, *reply = &reply1;
 252     char cmd[1024];
 253
 254 retry:
 255     if (rt->server_type == RTSP_SERVER_REAL) {
 256         int i;
 257
 258         for (i = 0; i < s->nb_streams; i++)
 259             rt->real_setup[i] = s->streams[i]->discard;
 260
 261         if (!rt->need_subscription) {
 262             if (memcmp (rt->real_setup, rt->real_setup_cache,
 263                         sizeof(enum AVDiscard) * s->nb_streams)) {
 264                 snprintf(cmd, sizeof(cmd),
 265                          "Unsubscribe: %s\r\n",
 266                          rt->last_subscription);
 267                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 268                                  cmd, reply, NULL);
 269                 if (reply->status_code != RTSP_STATUS_OK)
 270                     return AVERROR_INVALIDDATA;
 271                 rt->need_subscription = 1;
 272             }
 273         }
 274
 275         if (rt->need_subscription) {
 276             int r, rule_nr, first = 1;
 277
 278             memcpy(rt->real_setup_cache, rt->real_setup,
 279                    sizeof(enum AVDiscard) * s->nb_streams);
 280             rt->last_subscription[0] = 0;
 281
 282             snprintf(cmd, sizeof(cmd),
 283                      "Subscribe: ");
 284             for (i = 0; i < rt->nb_rtsp_streams; i++) {
 285                 rule_nr = 0;
 286                 for (r = 0; r < s->nb_streams; r++) {
 287                     if (s->streams[r]->id == i) {
 288                         if (s->streams[r]->discard != AVDISCARD_ALL) {
 289                             if (!first)
 290                                 av_strlcat(rt->last_subscription, ",",
 291                                            sizeof(rt->last_subscription));
 292                             ff_rdt_subscribe_rule(
 293                                 rt->last_subscription,
 294                                 sizeof(rt->last_subscription), i, rule_nr);
 295                             first = 0;
 296                         }
 297                         rule_nr++;
 298                     }
 299                 }
 300             }
 301             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
 302             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
 303                              cmd, reply, NULL);
 304             if (reply->status_code != RTSP_STATUS_OK)
 305                 return AVERROR_INVALIDDATA;
 306             rt->need_subscription = 0;
 307
 308             if (rt->state == RTSP_STATE_STREAMING)
 309                 rtsp_read_play (s);
 310         }
 311     }
 312
 313     ret = ff_rtsp_fetch_packet(s, pkt);
 314     if (ret < 0) {
 315         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
 316             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
 317                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
 318                 RTSPMessageHeader reply1, *reply = &reply1;
 319                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
 320                 if (rtsp_read_pause(s) != 0)
 321                     return -1;
 322                 // TEARDOWN is required on Real-RTSP, but might make
 323                 // other servers close the connection.
 324                 if (rt->server_type == RTSP_SERVER_REAL)
 325                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
 326                                      reply, NULL);
 327                 rt->session_id[0] = '\0';
 328                 if (resetup_tcp(s) == 0) {
 329                     rt->state = RTSP_STATE_IDLE;
 330                     rt->need_subscription = 1;
 331                     if (rtsp_read_play(s) != 0)
 332                         return -1;
 333                     goto retry;
 334                 }
 335             }
 336         }
 337         return ret;
 338     }
 339     rt->packets++;
 340
 341     /* send dummy request to keep TCP connection alive */
 342     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
 343         if (rt->server_type == RTSP_SERVER_WMS ||
 344            (rt->server_type != RTSP_SERVER_REAL &&
 345             rt->get_parameter_supported)) {
 346             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
 347         } else {
 348             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
 349         }
 350     }
 351
 352     return 0;
 353 }
 354
 355 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
 356                           int64_t timestamp, int flags)
 357 {
 358     RTSPState *rt = s->priv_data;
 359
 360     rt->seek_timestamp = av_rescale_q(timestamp,
 361                                       s->streams[stream_index]->time_base,
 362                                       AV_TIME_BASE_Q);
 363     switch(rt->state) {
 364     default:
 365     case RTSP_STATE_IDLE:
 366         break;
 367     case RTSP_STATE_STREAMING:
 368         if (rtsp_read_pause(s) != 0)
 369             return -1;
 370         rt->state = RTSP_STATE_SEEKING;
 371         if (rtsp_read_play(s) != 0)
 372             return -1;
 373         break;
 374     case RTSP_STATE_PAUSED:
 375         rt->state = RTSP_STATE_IDLE;
 376         break;
 377     }
 378     return 0;
 379 }
 380
 381 static int rtsp_read_close(AVFormatContext *s)
 382 {
 383     RTSPState *rt = s->priv_data;
 384
 385 #if 0
 386     /* NOTE: it is valid to flush the buffer here */
 387     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
 388         avio_close(&rt->rtsp_gb);
 389     }
 390 #endif
 391     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
 392
 393     ff_rtsp_close_streams(s);
 394     ff_rtsp_close_connections(s);
 395     ff_network_close();
 396     rt->real_setup = NULL;
 397     av_freep(&rt->real_setup_cache);
 398     return 0;
 399 }
 400
 401 static const AVOption options[] = {
 402     { "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 },
 403     { NULL },
 404 };
 405
 406 const AVClass rtsp_demuxer_class = {
 407     .class_name     = "RTSP demuxer",
 408     .item_name      = av_default_item_name,
 409     .option         = options,
 410     .version        = LIBAVUTIL_VERSION_INT,
 411 };
 412
 413 AVInputFormat ff_rtsp_demuxer = {
 414     "rtsp",
 415     NULL_IF_CONFIG_SMALL("RTSP input format"),
 416     sizeof(RTSPState),
 417     rtsp_probe,
 418     rtsp_read_header,
 419     rtsp_read_packet,
 420     rtsp_read_close,
 421     rtsp_read_seek,
 422     .flags = AVFMT_NOFILE,
 423     .read_play = rtsp_read_play,
 424     .read_pause = rtsp_read_pause,
 425     .priv_class = &rtsp_demuxer_class,
 426 };