git.sesse.net Git - vlc/blob - src/input/input.c

   1 /*****************************************************************************
   2  * input.c: input thread
   3  * Read an MPEG2 stream, demultiplex and parse it before sending it to
   4  * decoders.
   5  *****************************************************************************
   6  * Copyright (C) 1998-2001 VideoLAN
   7  * $Id: input.c,v 1.187 2002/03/06 01:20:56 stef Exp $
   8  *
   9  * Authors: Christophe Massiot <massiot@via.ecp.fr>
  10  *          Alexis Guillard <alexis.guillard@bt.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #include <stdlib.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34
  35 #include <videolan/vlc.h>
  36
  37 #include <string.h>
  38 #include <errno.h>
  39
  40 #ifdef HAVE_SYS_TIMES_H
  41 #   include <sys/times.h>
  42 #endif
  43
  44 #include "netutils.h"
  45
  46 #include "intf_playlist.h"
  47
  48 #include "stream_control.h"
  49 #include "input_ext-intf.h"
  50 #include "input_ext-dec.h"
  51 #include "input_ext-plugins.h"
  52
  53 #include "interface.h"
  54
  55 /*****************************************************************************
  56  * Local prototypes
  57  *****************************************************************************/
  58 static  int RunThread       ( input_thread_t *p_input );
  59 static  int InitThread      ( input_thread_t *p_input );
  60 static void ErrorThread     ( input_thread_t *p_input );
  61 static void CloseThread     ( input_thread_t *p_input );
  62 static void DestroyThread   ( input_thread_t *p_input );
  63 static void EndThread       ( input_thread_t *p_input );
  64
  65 /*****************************************************************************
  66  * input_InitBank: initialize the input bank.
  67  *****************************************************************************/
  68 void input_InitBank ( void )
  69 {
  70     p_input_bank->i_count = 0;
  71
  72     /* XXX: Workaround for old interface modules */
  73     p_input_bank->pp_input[0] = NULL;
  74
  75     vlc_mutex_init( &p_input_bank->lock );
  76 }
  77
  78 /*****************************************************************************
  79  * input_EndBank: empty the input bank.
  80  *****************************************************************************
  81  * This function ends all unused inputs and empties the bank in
  82  * case of success.
  83  *****************************************************************************/
  84 void input_EndBank ( void )
  85 {
  86     int i_input;
  87
  88     /* Ask all remaining video outputs to die */
  89     for( i_input = 0; i_input < p_input_bank->i_count; i_input++ )
  90     {
  91         input_StopThread(
  92                 p_input_bank->pp_input[ i_input ], NULL );
  93         input_DestroyThread(
  94                 p_input_bank->pp_input[ i_input ] );
  95     }
  96
  97     vlc_mutex_destroy( &p_input_bank->lock );
  98 }
  99
 100 /*****************************************************************************
 101  * input_CreateThread: creates a new input thread
 102  *****************************************************************************
 103  * This function creates a new input, and returns a pointer
 104  * to its description. On error, it returns NULL.
 105  * If pi_status is NULL, then the function will block until the thread is ready.
 106  * If not, it will be updated using one of the THREAD_* constants.
 107  *****************************************************************************/
 108 input_thread_t *input_CreateThread ( playlist_item_t *p_item, int *pi_status )
 109 {
 110     input_thread_t *    p_input;                        /* thread descriptor */
 111
 112     /* Allocate descriptor */
 113     p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
 114     if( p_input == NULL )
 115     {
 116         intf_ErrMsg( "input error: can't allocate input thread (%s)",
 117                      strerror(errno) );
 118         return( NULL );
 119     }
 120
 121     /* Initialize thread properties */
 122     p_input->b_die      = 0;
 123     p_input->b_error    = 0;
 124     p_input->b_eof      = 0;
 125
 126     /* Set target */
 127     p_input->psz_source = strdup( p_item->psz_name );
 128
 129     /* Set status */
 130     p_input->i_status   = THREAD_CREATE;
 131
 132     /* Demux */
 133     p_input->p_demux_module = NULL;
 134     p_input->pf_init    = NULL;
 135     p_input->pf_end     = NULL;
 136     p_input->pf_demux   = NULL;
 137     p_input->pf_rewind  = NULL;
 138
 139     /* Access */
 140     p_input->p_access_module = NULL;
 141     p_input->pf_open        = NULL;
 142     p_input->pf_close       = NULL;
 143     p_input->pf_read        = NULL;
 144     p_input->pf_seek        = NULL;
 145     p_input->pf_set_area    = NULL;
 146     p_input->pf_set_program = NULL;
 147
 148     p_input->i_bufsize = 0;
 149     p_input->i_mtu = 0;
 150
 151     /* Initialize statistics */
 152     p_input->c_loops                    = 0;
 153     p_input->stream.c_packets_read      = 0;
 154     p_input->stream.c_packets_trashed   = 0;
 155
 156     /* Set locks. */
 157     vlc_mutex_init( &p_input->stream.stream_lock );
 158     vlc_cond_init( &p_input->stream.stream_wait );
 159     vlc_mutex_init( &p_input->stream.control.control_lock );
 160
 161     /* Initialize stream description */
 162     p_input->stream.b_changed = 0;
 163     p_input->stream.i_es_number = 0;
 164     p_input->stream.i_selected_es_number = 0;
 165     p_input->stream.i_pgrm_number = 0;
 166     p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
 167     p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 168     p_input->stream.i_mux_rate = 0;
 169
 170     /* no stream, no program, no area, no es */
 171     p_input->stream.p_new_program = NULL;
 172
 173     p_input->stream.i_area_nb = 0;
 174     p_input->stream.pp_areas = NULL;
 175     p_input->stream.p_selected_area = NULL;
 176     p_input->stream.p_new_area = NULL;
 177
 178     p_input->stream.pp_selected_es = NULL;
 179     p_input->stream.p_removed_es = NULL;
 180     p_input->stream.p_newly_selected_es = NULL;
 181
 182     /* By default there is one area in a stream */
 183     input_AddArea( p_input );
 184     p_input->stream.p_selected_area = p_input->stream.pp_areas[0];
 185
 186     /* Initialize stream control properties. */
 187     p_input->stream.control.i_status = PLAYING_S;
 188     p_input->stream.control.i_rate = DEFAULT_RATE;
 189     p_input->stream.control.b_mute = 0;
 190     p_input->stream.control.b_grayscale = config_GetIntVariable(
 191                                                   VOUT_GRAYSCALE_VAR );
 192     p_input->stream.control.i_smp = config_GetIntVariable( VDEC_SMP_VAR );
 193
 194     intf_WarnMsg( 1, "input: playlist item `%s'", p_input->psz_source );
 195
 196     /* Create thread. */
 197     if( vlc_thread_create( &p_input->thread_id, "input",
 198                            (vlc_thread_func_t)RunThread, (void *) p_input ) )
 199     {
 200         intf_ErrMsg( "input error: can't create input thread (%s)",
 201                      strerror(errno) );
 202         free( p_input );
 203         return( NULL );
 204     }
 205
 206 #if 0
 207     /* If status is NULL, wait until the thread is created */
 208     if( pi_status == NULL )
 209     {
 210         do
 211         {
 212             msleep( THREAD_SLEEP );
 213         } while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
 214                 && (i_status != THREAD_FATAL) );
 215     }
 216 #endif
 217
 218     return( p_input );
 219 }
 220
 221 /*****************************************************************************
 222  * input_StopThread: mark an input thread as zombie
 223  *****************************************************************************
 224  * This function should not return until the thread is effectively cancelled.
 225  *****************************************************************************/
 226 void input_StopThread( input_thread_t *p_input, int *pi_status )
 227 {
 228     /* Make the thread exit from a possible vlc_cond_wait() */
 229     vlc_mutex_lock( &p_input->stream.stream_lock );
 230
 231     /* Request thread destruction */
 232     p_input->b_die = 1;
 233
 234     vlc_cond_signal( &p_input->stream.stream_wait );
 235     vlc_mutex_unlock( &p_input->stream.stream_lock );
 236
 237     /* If status is NULL, wait until thread has been destroyed */
 238 #if 0
 239     if( pi_status == NULL )
 240     {
 241         do
 242         {
 243             msleep( THREAD_SLEEP );
 244         } while ( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
 245                   && (i_status != THREAD_FATAL) );
 246     }
 247 #endif
 248 }
 249
 250 /*****************************************************************************
 251  * input_DestroyThread: mark an input thread as zombie
 252  *****************************************************************************
 253  * This function should not return until the thread is effectively cancelled.
 254  *****************************************************************************/
 255 void input_DestroyThread( input_thread_t *p_input )
 256 {
 257     /* Join the thread */
 258     vlc_thread_join( p_input->thread_id );
 259
 260     /* Destroy Mutex locks */
 261     vlc_mutex_destroy( &p_input->stream.control.control_lock );
 262     vlc_cond_destroy( &p_input->stream.stream_wait );
 263     vlc_mutex_destroy( &p_input->stream.stream_lock );
 264
 265     /* Free input structure */
 266     free( p_input );
 267 }
 268
 269 /*****************************************************************************
 270  * RunThread: main thread loop
 271  *****************************************************************************
 272  * Thread in charge of processing the network packets and demultiplexing.
 273  *****************************************************************************/
 274 static int RunThread( input_thread_t *p_input )
 275 {
 276     if( InitThread( p_input ) )
 277     {
 278         /* If we failed, wait before we are killed, and exit */
 279         p_input->i_status = THREAD_ERROR;
 280         p_input->b_error = 1;
 281         ErrorThread( p_input );
 282         DestroyThread( p_input );
 283         return 0;
 284     }
 285
 286     p_input->i_status = THREAD_READY;
 287
 288     /* initialization is complete */
 289     vlc_mutex_lock( &p_input->stream.stream_lock );
 290     p_input->stream.b_changed = 1;
 291     vlc_mutex_unlock( &p_input->stream.stream_lock );
 292
 293     while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
 294     {
 295         int i, i_count;
 296
 297         p_input->c_loops++;
 298
 299         vlc_mutex_lock( &p_input->stream.stream_lock );
 300
 301         if( p_input->stream.p_new_program )
 302         {
 303             if( p_input->pf_set_program != NULL )
 304             {
 305
 306                 p_input->pf_set_program( p_input,
 307                         p_input->stream.p_new_program );
 308
 309                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 310                 {
 311                     pgrm_descriptor_t * p_pgrm
 312                                             = p_input->stream.pp_programs[i];
 313                     /* Escape all decoders for the stream discontinuity they
 314                      * will encounter. */
 315                     input_EscapeDiscontinuity( p_input, p_pgrm );
 316
 317                     /* Reinitialize synchro. */
 318                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 319                 }
 320             }
 321             p_input->stream.p_new_program = NULL;
 322         }
 323
 324         if( p_input->stream.p_new_area )
 325         {
 326             if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
 327             {
 328
 329                 p_input->pf_set_area( p_input, p_input->stream.p_new_area );
 330
 331                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 332                 {
 333                     pgrm_descriptor_t * p_pgrm
 334                                             = p_input->stream.pp_programs[i];
 335                     /* Escape all decoders for the stream discontinuity they
 336                      * will encounter. */
 337                     input_EscapeDiscontinuity( p_input, p_pgrm );
 338
 339                     /* Reinitialize synchro. */
 340                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 341                 }
 342             }
 343             p_input->stream.p_new_area = NULL;
 344         }
 345
 346         if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
 347         {
 348             if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
 349             {
 350                 off_t i_new_pos = p_input->stream.p_selected_area->i_seek;
 351                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 352                 p_input->pf_seek( p_input, i_new_pos );
 353                 vlc_mutex_lock( &p_input->stream.stream_lock );
 354
 355                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 356                 {
 357                     pgrm_descriptor_t * p_pgrm
 358                                             = p_input->stream.pp_programs[i];
 359                     /* Escape all decoders for the stream discontinuity they
 360                      * will encounter. */
 361                     input_EscapeDiscontinuity( p_input, p_pgrm );
 362
 363                     /* Reinitialize synchro. */
 364                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 365                 }
 366
 367                 /* Reinitialize buffer manager. */
 368                 input_AccessReinit( p_input );
 369             }
 370             p_input->stream.p_selected_area->i_seek = NO_SEEK;
 371         }
 372
 373         if( p_input->stream.p_removed_es )
 374         {
 375             input_UnselectES( p_input, p_input->stream.p_removed_es );
 376             p_input->stream.p_removed_es = NULL;
 377         }
 378
 379         if( p_input->stream.p_newly_selected_es )
 380         {
 381             input_SelectES( p_input, p_input->stream.p_newly_selected_es );
 382             p_input->stream.p_newly_selected_es = NULL;
 383         }
 384
 385         if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
 386         {
 387             if( p_input->stream.b_new_mute )
 388             {
 389                 input_EscapeAudioDiscontinuity( p_input );
 390             }
 391
 392             vlc_mutex_lock( &p_input->stream.control.control_lock );
 393             p_input->stream.control.b_mute = p_input->stream.b_new_mute;
 394             vlc_mutex_unlock( &p_input->stream.control.control_lock );
 395
 396             p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 397         }
 398
 399         vlc_mutex_unlock( &p_input->stream.stream_lock );
 400
 401         /* Read and demultiplex some data. */
 402         i_count = p_input->pf_demux( p_input );
 403
 404         if( i_count == 0 && p_input->stream.b_seekable )
 405         {
 406             /* End of file - we do not set b_die because only the
 407              * interface is allowed to do so. */
 408             intf_WarnMsg( 3, "input: EOF reached" );
 409             p_input->b_eof = 1;
 410         }
 411         else if( i_count < 0 )
 412         {
 413             p_input->b_error = 1;
 414         }
 415     }
 416
 417     if( p_input->b_error || p_input->b_eof )
 418     {
 419         ErrorThread( p_input );
 420     }
 421
 422     EndThread( p_input );
 423
 424     DestroyThread( p_input );
 425
 426     return 0;
 427 }
 428
 429 /*****************************************************************************
 430  * InitThread: init the input Thread
 431  *****************************************************************************/
 432 static int InitThread( input_thread_t * p_input )
 433 {
 434     /* Parse source string. Syntax : [[<access>][/<demux>]:][<source>] */
 435     char * psz_parser = p_input->psz_source;
 436
 437     /* Skip the plug-in names */
 438     while( *psz_parser && *psz_parser != ':' )
 439     {
 440         psz_parser++;
 441     }
 442 #ifdef WIN32
 443     if( psz_parser - p_input->psz_source == 1 )
 444     {
 445         intf_WarnMsg( 2, "Drive letter %c: specified in source string",
 446                       p_input->psz_source ) ;
 447         psz_parser = "";
 448     }
 449 #endif
 450
 451     if( !*psz_parser )
 452     {
 453         p_input->psz_access = p_input->psz_demux = NULL;
 454         p_input->psz_name = p_input->psz_source;
 455     }
 456     else
 457     {
 458         *psz_parser++ = '\0';
 459
 460         p_input->psz_name = psz_parser;
 461
 462         /* Come back to parse the access and demux plug-ins */
 463         psz_parser = p_input->psz_source;
 464
 465         if( !*psz_parser )
 466         {
 467             /* No access */
 468             p_input->psz_access = NULL;
 469         }
 470         else if( *psz_parser == '/' )
 471         {
 472             /* No access */
 473             p_input->psz_access = NULL;
 474             psz_parser++;
 475         }
 476         else
 477         {
 478             p_input->psz_access = psz_parser;
 479
 480             while( *psz_parser && *psz_parser != '/' )
 481             {
 482                 psz_parser++;
 483             }
 484
 485             if( *psz_parser == '/' )
 486             {
 487                 *psz_parser++ = '\0';
 488             }
 489         }
 490
 491         if( !*psz_parser )
 492         {
 493             /* No demux */
 494             p_input->psz_demux = NULL;
 495         }
 496         else
 497         {
 498             p_input->psz_demux = psz_parser;
 499         }
 500     }
 501
 502     intf_WarnMsg( 2, "input: access=%s demux=%s name=%s",
 503                   p_input->psz_access, p_input->psz_demux,
 504                   p_input->psz_name );
 505
 506     if( input_AccessInit( p_input ) == -1 )
 507     {
 508         return( -1 );
 509     }
 510
 511     /* Find and open appropriate access plug-in. */
 512     p_input->p_access_module = module_Need( MODULE_CAPABILITY_ACCESS,
 513                                  p_input->psz_access,
 514                                  (void *)p_input );
 515
 516     if( p_input->p_access_module == NULL )
 517     {
 518         intf_ErrMsg( "input error: no suitable access plug-in for `%s/%s:%s'",
 519                      p_input->psz_access, p_input->psz_demux,
 520                      p_input->psz_name );
 521         return( -1 );
 522     }
 523
 524 #define f p_input->p_access_module->p_functions->access.functions.access
 525     p_input->pf_open          = f.pf_open;
 526     p_input->pf_close         = f.pf_close;
 527     p_input->pf_read          = f.pf_read;
 528     p_input->pf_set_area      = f.pf_set_area;
 529     p_input->pf_set_program   = f.pf_set_program;
 530     p_input->pf_seek          = f.pf_seek;
 531 #undef f
 532
 533     /* Waiting for stream. */
 534     if( p_input->i_mtu )
 535     {
 536         p_input->i_bufsize = p_input->i_mtu;
 537     }
 538     else
 539     {
 540         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
 541     }
 542
 543     if( p_input->p_current_data == NULL && p_input->pf_read != NULL )
 544     {
 545         while( !input_FillBuffer( p_input ) )
 546         {
 547             if( p_input->b_die || p_input->b_error )
 548             {
 549                 module_Unneed( p_input->p_access_module );
 550                 return( -1 );
 551             }
 552         }
 553     }
 554
 555     /* Find and open appropriate demux plug-in. */
 556     p_input->p_demux_module = module_Need( MODULE_CAPABILITY_DEMUX,
 557                                  p_input->psz_demux,
 558                                  (void *)p_input );
 559
 560     if( p_input->p_demux_module == NULL )
 561     {
 562         intf_ErrMsg( "input error: no suitable demux plug-in for `%s/%s:%s'",
 563                      p_input->psz_access, p_input->psz_demux,
 564                      p_input->psz_name );
 565         module_Unneed( p_input->p_access_module );
 566         return( -1 );
 567     }
 568
 569 #define f p_input->p_demux_module->p_functions->demux.functions.demux
 570     p_input->pf_init          = f.pf_init;
 571     p_input->pf_end           = f.pf_end;
 572     p_input->pf_demux         = f.pf_demux;
 573     p_input->pf_rewind        = f.pf_rewind;
 574 #undef f
 575
 576     return( 0 );
 577 }
 578
 579 /*****************************************************************************
 580  * ErrorThread: RunThread() error loop
 581  *****************************************************************************
 582  * This function is called when an error occured during thread main's loop.
 583  *****************************************************************************/
 584 static void ErrorThread( input_thread_t *p_input )
 585 {
 586     while( !p_input->b_die )
 587     {
 588         /* Sleep a while */
 589         msleep( INPUT_IDLE_SLEEP );
 590     }
 591 }
 592
 593 /*****************************************************************************
 594  * EndThread: end the input thread
 595  *****************************************************************************/
 596 static void EndThread( input_thread_t * p_input )
 597 {
 598     /* Store status */
 599     p_input->i_status = THREAD_END;
 600
 601     if( p_main->b_stats )
 602     {
 603 #ifdef HAVE_SYS_TIMES_H
 604         /* Display statistics */
 605         struct tms  cpu_usage;
 606         times( &cpu_usage );
 607
 608         intf_StatMsg( "input stats: %d loops consuming user: %d, system: %d",
 609                       p_input->c_loops,
 610                       cpu_usage.tms_utime, cpu_usage.tms_stime );
 611 #else
 612         intf_StatMsg( "input stats: %d loops", p_input->c_loops );
 613 #endif
 614
 615         input_DumpStream( p_input );
 616     }
 617
 618     /* Free all ES and destroy all decoder threads */
 619     input_EndStream( p_input );
 620
 621     /* Free demultiplexer's data */
 622     p_input->pf_end( p_input );
 623     module_Unneed( p_input->p_demux_module );
 624
 625     /* Close the access plug-in */
 626     CloseThread( p_input );
 627 }
 628
 629 /*****************************************************************************
 630  * CloseThread: close the target
 631  *****************************************************************************/
 632 static void CloseThread( input_thread_t * p_input )
 633 {
 634     p_input->pf_close( p_input );
 635     module_Unneed( p_input->p_access_module );
 636
 637     input_AccessEnd( p_input );
 638
 639     free( p_input->psz_source );
 640 }
 641
 642 /*****************************************************************************
 643  * DestroyThread: destroy the input thread
 644  *****************************************************************************/
 645 static void DestroyThread( input_thread_t * p_input )
 646 {
 647     /* Update status */
 648     p_input->i_status = THREAD_OVER;
 649 }
 650