modules/stream_out/vod.c

   1 /*****************************************************************************
   2  * vod.c: rtsp VoD server module
   3  *****************************************************************************
   4  * Copyright (C) 2003-2006, 2010 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *          Pierre Ynard
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with this program; if not, write to the Free Software Foundation,
  23  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_input.h>
  37 #include <vlc_sout.h>
  38 #include <vlc_block.h>
  39
  40 #include <vlc_vod.h>
  41 #include <vlc_url.h>
  42 #include <vlc_network.h>
  43 #include <vlc_memstream.h>
  44
  45 #include <assert.h>
  46
  47 #include "rtp.h"
  48
  49 /*****************************************************************************
  50  * Exported prototypes
  51  *****************************************************************************/
  52
  53 typedef struct media_es_t media_es_t;
  54
  55 struct media_es_t
  56 {
  57     int es_id;
  58     rtp_format_t rtp_fmt;
  59     rtsp_stream_id_t *rtsp_id;
  60 };
  61
  62 struct vod_media_t
  63 {
  64     /* VoD server */
  65     vod_t *p_vod;
  66
  67     /* RTSP server */
  68     rtsp_stream_t *rtsp;
  69
  70     /* ES list */
  71     int        i_es;
  72     media_es_t **es;
  73     const char *psz_mux;
  74
  75     /* Infos */
  76     mtime_t i_length;
  77 };
  78
  79 struct vod_sys_t
  80 {
  81     char *psz_rtsp_path;
  82
  83     /* */
  84     vlc_thread_t thread;
  85     block_fifo_t *p_fifo_cmd;
  86 };
  87
  88 /* rtsp delayed command (to avoid deadlock between vlm/httpd) */
  89 typedef enum
  90 {
  91     RTSP_CMD_TYPE_STOP,
  92     RTSP_CMD_TYPE_ADD,
  93     RTSP_CMD_TYPE_DEL,
  94 } rtsp_cmd_type_t;
  95
  96 /* */
  97 typedef struct
  98 {
  99     int i_type;
 100     vod_media_t *p_media;
 101     char *psz_arg;
 102 } rtsp_cmd_t;
 103
 104 static vod_media_t *MediaNew( vod_t *, const char *, input_item_t * );
 105 static void         MediaDel( vod_t *, vod_media_t * );
 106 static void         MediaAskDel ( vod_t *, vod_media_t * );
 107
 108 static void* CommandThread( void *obj );
 109 static void  CommandPush( vod_t *, rtsp_cmd_type_t, vod_media_t *,
 110                           const char *psz_arg );
 111
 112 /*****************************************************************************
 113  * Open: Starts the RTSP server module
 114  *****************************************************************************/
 115 int OpenVoD( vlc_object_t *p_this )
 116 {
 117     vod_t *p_vod = (vod_t *)p_this;
 118     vod_sys_t *p_sys = NULL;
 119     char *psz_url;
 120
 121     p_vod->p_sys = p_sys = malloc( sizeof( vod_sys_t ) );
 122     if( !p_sys ) goto error;
 123
 124     psz_url = var_InheritString( p_vod, "rtsp-host" );
 125
 126     if( psz_url == NULL )
 127         p_sys->psz_rtsp_path = strdup( "/" );
 128     else
 129     {
 130         vlc_url_t url;
 131         vlc_UrlParse( &url, psz_url );
 132         free( psz_url );
 133
 134         if( url.psz_path == NULL )
 135             p_sys->psz_rtsp_path = strdup( "/" );
 136         else
 137         if( !( strlen( url.psz_path ) > 0
 138                && url.psz_path[strlen( url.psz_path ) - 1] == '/' ) )
 139         {
 140             if( asprintf( &p_sys->psz_rtsp_path, "%s/", url.psz_path ) == -1 )
 141             {
 142                 p_sys->psz_rtsp_path = NULL;
 143                 vlc_UrlClean( &url );
 144                 goto error;
 145             }
 146         }
 147         else
 148             p_sys->psz_rtsp_path = strdup( url.psz_path );
 149
 150         vlc_UrlClean( &url );
 151     }
 152
 153     p_vod->pf_media_new = MediaNew;
 154     p_vod->pf_media_del = MediaAskDel;
 155
 156     p_sys->p_fifo_cmd = block_FifoNew();
 157     if( vlc_clone( &p_sys->thread, CommandThread, p_vod, VLC_THREAD_PRIORITY_LOW ) )
 158     {
 159         msg_Err( p_vod, "cannot spawn rtsp vod thread" );
 160         block_FifoRelease( p_sys->p_fifo_cmd );
 161         goto error;
 162     }
 163
 164     return VLC_SUCCESS;
 165
 166 error:
 167     if( p_sys )
 168     {
 169         free( p_sys->psz_rtsp_path );
 170         free( p_sys );
 171     }
 172
 173     return VLC_EGENERIC;
 174 }
 175
 176 /*****************************************************************************
 177  * Close:
 178  *****************************************************************************/
 179 void CloseVoD( vlc_object_t * p_this )
 180 {
 181     vod_t *p_vod = (vod_t *)p_this;
 182     vod_sys_t *p_sys = p_vod->p_sys;
 183
 184     /* Stop command thread */
 185     vlc_cancel( p_sys->thread );
 186     vlc_join( p_sys->thread, NULL );
 187
 188     while( block_FifoCount( p_sys->p_fifo_cmd ) > 0 )
 189     {
 190         rtsp_cmd_t cmd;
 191         block_t *p_block_cmd = block_FifoGet( p_sys->p_fifo_cmd );
 192         memcpy( &cmd, p_block_cmd->p_buffer, sizeof(cmd) );
 193         block_Release( p_block_cmd );
 194         if ( cmd.i_type == RTSP_CMD_TYPE_DEL )
 195             MediaDel(p_vod, cmd.p_media);
 196         free( cmd.psz_arg );
 197     }
 198     block_FifoRelease( p_sys->p_fifo_cmd );
 199
 200     free( p_sys->psz_rtsp_path );
 201     free( p_sys );
 202 }
 203
 204 /*****************************************************************************
 205  * Media handling
 206  *****************************************************************************/
 207 static vod_media_t *MediaNew( vod_t *p_vod, const char *psz_name,
 208                               input_item_t *p_item )
 209 {
 210     vod_media_t *p_media = calloc( 1, sizeof(vod_media_t) );
 211     if( !p_media )
 212         return NULL;
 213
 214     p_media->p_vod = p_vod;
 215     p_media->rtsp = NULL;
 216     TAB_INIT( p_media->i_es, p_media->es );
 217     p_media->psz_mux = NULL;
 218     p_media->i_length = input_item_GetDuration( p_item );
 219
 220     vlc_mutex_lock( &p_item->lock );
 221     msg_Dbg( p_vod, "media '%s' has %i declared ES", psz_name, p_item->i_es );
 222     for( int i = 0; i < p_item->i_es; i++ )
 223     {
 224         es_format_t *p_fmt = p_item->es[i];
 225
 226         switch( p_fmt->i_codec )
 227         {
 228             case VLC_FOURCC( 'm', 'p', '2', 't' ):
 229                 p_media->psz_mux = "ts";
 230                 break;
 231             case VLC_FOURCC( 'm', 'p', '2', 'p' ):
 232                 p_media->psz_mux = "ps";
 233                 break;
 234         }
 235         assert(p_media->psz_mux == NULL || p_item->i_es == 1);
 236
 237         media_es_t *p_es = calloc( 1, sizeof(media_es_t) );
 238         if( !p_es )
 239             continue;
 240
 241         p_es->es_id = p_fmt->i_id;
 242         p_es->rtsp_id = NULL;
 243
 244         if (rtp_get_fmt(VLC_OBJECT(p_vod), p_fmt, p_media->psz_mux,
 245                         &p_es->rtp_fmt) != VLC_SUCCESS)
 246         {
 247             free(p_es);
 248             continue;
 249         }
 250
 251         TAB_APPEND( p_media->i_es, p_media->es, p_es );
 252         msg_Dbg(p_vod, "  - added ES %u %s (%4.4s)",
 253                 p_es->rtp_fmt.payload_type, p_es->rtp_fmt.ptname,
 254                 (char *)&p_fmt->i_codec);
 255     }
 256     vlc_mutex_unlock( &p_item->lock );
 257
 258     if (p_media->i_es == 0)
 259     {
 260         msg_Err(p_vod, "no ES was added to the media, aborting");
 261         goto error;
 262     }
 263
 264     msg_Dbg(p_vod, "adding media '%s'", psz_name);
 265
 266     CommandPush( p_vod, RTSP_CMD_TYPE_ADD, p_media, psz_name );
 267     return p_media;
 268
 269 error:
 270     MediaDel(p_vod, p_media);
 271     return NULL;
 272 }
 273
 274 static void MediaSetup( vod_t *p_vod, vod_media_t *p_media,
 275                         const char *psz_name )
 276 {
 277     vod_sys_t *p_sys = p_vod->p_sys;
 278     char *psz_path;
 279
 280     if( asprintf( &psz_path, "%s%s", p_sys->psz_rtsp_path, psz_name ) < 0 )
 281         return;
 282
 283     p_media->rtsp = RtspSetup(VLC_OBJECT(p_vod), p_media, psz_path);
 284     free( psz_path );
 285
 286     if (p_media->rtsp == NULL)
 287         return;
 288
 289     for (int i = 0; i < p_media->i_es; i++)
 290     {
 291         media_es_t *p_es = p_media->es[i];
 292         p_es->rtsp_id = RtspAddId(p_media->rtsp, NULL, 0,
 293                                   p_es->rtp_fmt.clock_rate, -1);
 294     }
 295 }
 296
 297 static void MediaAskDel ( vod_t *p_vod, vod_media_t *p_media )
 298 {
 299     msg_Dbg( p_vod, "deleting media" );
 300     CommandPush( p_vod, RTSP_CMD_TYPE_DEL, p_media, NULL );
 301 }
 302
 303 static void MediaDel( vod_t *p_vod, vod_media_t *p_media )
 304 {
 305     (void) p_vod;
 306
 307     if (p_media->rtsp != NULL)
 308     {
 309         for (int i = 0; i < p_media->i_es; i++)
 310         {
 311             media_es_t *p_es = p_media->es[i];
 312             if (p_es->rtsp_id != NULL)
 313                 RtspDelId(p_media->rtsp, p_es->rtsp_id);
 314         }
 315         RtspUnsetup(p_media->rtsp);
 316     }
 317
 318     for( int i = 0; i < p_media->i_es; i++ )
 319     {
 320         free( p_media->es[i]->rtp_fmt.fmtp );
 321         free( p_media->es[i] );
 322     }
 323     free( p_media->es );
 324
 325     free( p_media );
 326 }
 327
 328 static void CommandPush( vod_t *p_vod, rtsp_cmd_type_t i_type,
 329                          vod_media_t *p_media, const char *psz_arg )
 330 {
 331     rtsp_cmd_t cmd;
 332     block_t *p_cmd;
 333
 334     cmd.i_type = i_type;
 335     cmd.p_media = p_media;
 336     if( psz_arg )
 337         cmd.psz_arg = strdup(psz_arg);
 338     else
 339         cmd.psz_arg = NULL;
 340
 341     p_cmd = block_Alloc( sizeof(rtsp_cmd_t) );
 342     memcpy( p_cmd->p_buffer, &cmd, sizeof(cmd) );
 343
 344     block_FifoPut( p_vod->p_sys->p_fifo_cmd, p_cmd );
 345 }
 346
 347 static void* CommandThread( void *obj )
 348 {
 349     vod_t *p_vod = (vod_t*)obj;
 350     vod_sys_t *p_sys = p_vod->p_sys;
 351
 352     for( ;; )
 353     {
 354         block_t *p_block_cmd = block_FifoGet( p_sys->p_fifo_cmd );
 355         rtsp_cmd_t cmd;
 356
 357         if( !p_block_cmd )
 358             break;
 359
 360         int canc = vlc_savecancel ();
 361         memcpy( &cmd, p_block_cmd->p_buffer, sizeof(cmd) );
 362         block_Release( p_block_cmd );
 363
 364         /* */
 365         switch( cmd.i_type )
 366         {
 367         case RTSP_CMD_TYPE_ADD:
 368             MediaSetup(p_vod, cmd.p_media, cmd.psz_arg);
 369             break;
 370         case RTSP_CMD_TYPE_DEL:
 371             MediaDel(p_vod, cmd.p_media);
 372             break;
 373         case RTSP_CMD_TYPE_STOP:
 374             vod_MediaControl( p_vod, cmd.p_media, cmd.psz_arg, VOD_MEDIA_STOP );
 375             break;
 376
 377         default:
 378             break;
 379         }
 380
 381         free( cmd.psz_arg );
 382         vlc_restorecancel (canc);
 383     }
 384
 385     return NULL;
 386 }
 387
 388 /*****************************************************************************
 389  * SDPGenerateVoD
 390  * FIXME: needs to be merged more?
 391  *****************************************************************************/
 392 char *SDPGenerateVoD( const vod_media_t *p_media, const char *rtsp_url )
 393 {
 394     assert(rtsp_url != NULL);
 395     /* Check against URL format rtsp://[<ipv6>]:<port>/<path> */
 396     bool ipv6 = strlen( rtsp_url ) > 7 && rtsp_url[7] == '[';
 397
 398     /* Dummy destination address for RTSP */
 399     struct sockaddr_storage dst;
 400     socklen_t dstlen = ipv6 ? sizeof( struct sockaddr_in6 )
 401                             : sizeof( struct sockaddr_in );
 402     memset (&dst, 0, dstlen);
 403     dst.ss_family = ipv6 ? AF_INET6 : AF_INET;
 404 #ifdef HAVE_SA_LEN
 405     dst.ss_len = dstlen;
 406 #endif
 407
 408     struct vlc_memstream sdp;
 409
 410     if( vlc_sdp_Start( &sdp, VLC_OBJECT( p_media->p_vod ), "sout-rtp-",
 411                        NULL, 0, (struct sockaddr *)&dst, dstlen ) )
 412         return NULL;
 413
 414     if( p_media->i_length > 0 )
 415     {
 416         lldiv_t d = lldiv( p_media->i_length / 1000, 1000 );
 417         sdp_AddAttribute( &sdp, "range"," npt=0-%lld.%03u", d.quot,
 418                           (unsigned)d.rem );
 419     }
 420
 421     sdp_AddAttribute( &sdp, "control", "%s", rtsp_url );
 422
 423     /* No locking needed, the ES table can't be modified now */
 424     for( int i = 0; i < p_media->i_es; i++ )
 425     {
 426         media_es_t *p_es = p_media->es[i];
 427         rtp_format_t *rtp_fmt = &p_es->rtp_fmt;
 428         const char *mime_major; /* major MIME type */
 429
 430         switch( rtp_fmt->cat )
 431         {
 432             case VIDEO_ES:
 433                 mime_major = "video";
 434                 break;
 435             case AUDIO_ES:
 436                 mime_major = "audio";
 437                 break;
 438             case SPU_ES:
 439                 mime_major = "text";
 440                 break;
 441             default:
 442                 continue;
 443         }
 444
 445         sdp_AddMedia( &sdp, mime_major, "RTP/AVP", 0,
 446                       rtp_fmt->payload_type, false, 0,
 447                       rtp_fmt->ptname, rtp_fmt->clock_rate, rtp_fmt->channels,
 448                       rtp_fmt->fmtp );
 449
 450         char *track_url = RtspAppendTrackPath( p_es->rtsp_id, rtsp_url );
 451         if( track_url != NULL )
 452         {
 453             sdp_AddAttribute( &sdp, "control", "%s", track_url );
 454             free( track_url );
 455         }
 456     }
 457
 458     return vlc_memstream_close( &sdp ) ? NULL : sdp.ptr;
 459 }
 460
 461 int vod_check_range(vod_media_t *p_media, const char *psz_session,
 462                     int64_t start, int64_t end)
 463 {
 464     (void) psz_session;
 465
 466     if (p_media->i_length > 0 && (start > p_media->i_length
 467                                   || end > p_media->i_length))
 468         return VLC_EGENERIC;
 469
 470     return VLC_SUCCESS;
 471 }
 472
 473 /* TODO: add support in the VLM for queueing proper PLAY requests with
 474  * start and end times, fetch whether the input is seekable... and then
 475  * clean this up */
 476 void vod_play(vod_media_t *p_media, const char *psz_session,
 477               int64_t *start, int64_t end)
 478 {
 479     if (vod_check_range(p_media, psz_session, *start, end) != VLC_SUCCESS)
 480         return;
 481
 482     /* We're passing the #vod{} sout chain here */
 483     vod_MediaControl(p_media->p_vod, p_media, psz_session,
 484                      VOD_MEDIA_PLAY, "vod", start);
 485 }
 486
 487 void vod_pause(vod_media_t *p_media, const char *psz_session, int64_t *npt)
 488 {
 489     vod_MediaControl(p_media->p_vod, p_media, psz_session,
 490                      VOD_MEDIA_PAUSE, npt);
 491 }
 492
 493 void vod_stop(vod_media_t *p_media, const char *psz_session)
 494 {
 495     CommandPush(p_media->p_vod, RTSP_CMD_TYPE_STOP, p_media, psz_session);
 496 }
 497
 498
 499 const char *vod_get_mux(const vod_media_t *p_media)
 500 {
 501     return p_media->psz_mux;
 502 }
 503
 504
 505 /* Match an RTP id to a VoD media ES and RTSP track to initialize it
 506  * with the data that was already set up */
 507 int vod_init_id(vod_media_t *p_media, const char *psz_session, int es_id,
 508                 sout_stream_id_sys_t *sout_id, rtp_format_t *rtp_fmt,
 509                 uint32_t *ssrc, uint16_t *seq_init)
 510 {
 511     media_es_t *p_es;
 512
 513     if (p_media->psz_mux != NULL)
 514     {
 515         assert(p_media->i_es == 1);
 516         p_es = p_media->es[0];
 517     }
 518     else
 519     {
 520         p_es = NULL;
 521         /* No locking needed, the ES table can't be modified now */
 522         for (int i = 0; i < p_media->i_es; i++)
 523         {
 524             if (p_media->es[i]->es_id == es_id)
 525             {
 526                 p_es = p_media->es[i];
 527                 break;
 528             }
 529         }
 530         if (p_es == NULL)
 531             return VLC_EGENERIC;
 532     }
 533
 534     memcpy(rtp_fmt, &p_es->rtp_fmt, sizeof(*rtp_fmt));
 535     if (p_es->rtp_fmt.fmtp != NULL)
 536         rtp_fmt->fmtp = strdup(p_es->rtp_fmt.fmtp);
 537
 538     return RtspTrackAttach(p_media->rtsp, psz_session, p_es->rtsp_id,
 539                            sout_id, ssrc, seq_init);
 540 }
 541
 542 /* Remove references to the RTP id from its RTSP track */
 543 void vod_detach_id(vod_media_t *p_media, const char *psz_session,
 544                    sout_stream_id_sys_t *sout_id)
 545 {
 546     RtspTrackDetach(p_media->rtsp, psz_session, sout_id);
 547 }
 548