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 1.192 2002/04/04 22:51:01 massiot Exp $
   8  *
   9  * Authors: Christophe Massiot <massiot@via.ecp.fr>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 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 General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <stdlib.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33
  34 #include <videolan/vlc.h>
  35
  36 #include <string.h>
  37 #include <errno.h>
  38
  39 #ifdef HAVE_SYS_TIMES_H
  40 #   include <sys/times.h>
  41 #endif
  42
  43 #include "netutils.h"
  44
  45 #include "intf_playlist.h"
  46
  47 #include "stream_control.h"
  48 #include "input_ext-intf.h"
  49 #include "input_ext-dec.h"
  50 #include "input_ext-plugins.h"
  51
  52 #include "interface.h"
  53
  54 /*****************************************************************************
  55  * Local prototypes
  56  *****************************************************************************/
  57 static  int RunThread       ( input_thread_t *p_input );
  58 static  int InitThread      ( input_thread_t *p_input );
  59 static void ErrorThread     ( input_thread_t *p_input );
  60 static void CloseThread     ( input_thread_t *p_input );
  61 static void DestroyThread   ( input_thread_t *p_input );
  62 static void EndThread       ( input_thread_t *p_input );
  63
  64 /*****************************************************************************
  65  * input_InitBank: initialize the input bank.
  66  *****************************************************************************/
  67 void input_InitBank ( void )
  68 {
  69     p_input_bank->i_count = 0;
  70
  71     /* XXX: Workaround for old interface modules */
  72     p_input_bank->pp_input[0] = NULL;
  73
  74     vlc_mutex_init( &p_input_bank->lock );
  75 }
  76
  77 /*****************************************************************************
  78  * input_EndBank: empty the input bank.
  79  *****************************************************************************
  80  * This function ends all unused inputs and empties the bank in
  81  * case of success.
  82  *****************************************************************************/
  83 void input_EndBank ( void )
  84 {
  85     int i_input;
  86
  87     /* Ask all remaining video outputs to die */
  88     for( i_input = 0; i_input < p_input_bank->i_count; i_input++ )
  89     {
  90         input_StopThread(
  91                 p_input_bank->pp_input[ i_input ], NULL );
  92         input_DestroyThread(
  93                 p_input_bank->pp_input[ i_input ] );
  94     }
  95
  96     vlc_mutex_destroy( &p_input_bank->lock );
  97 }
  98
  99 /*****************************************************************************
 100  * input_CreateThread: creates a new input thread
 101  *****************************************************************************
 102  * This function creates a new input, and returns a pointer
 103  * to its description. On error, it returns NULL.
 104  * If pi_status is NULL, then the function will block until the thread is ready.
 105  * If not, it will be updated using one of the THREAD_* constants.
 106  *****************************************************************************/
 107 input_thread_t *input_CreateThread ( playlist_item_t *p_item, int *pi_status )
 108 {
 109     input_thread_t *    p_input;                        /* thread descriptor */
 110
 111     /* Allocate descriptor */
 112     p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
 113     if( p_input == NULL )
 114     {
 115         intf_ErrMsg( "input error: can't allocate input thread (%s)",
 116                      strerror(errno) );
 117         return( NULL );
 118     }
 119
 120     /* Initialize thread properties */
 121     p_input->b_die      = 0;
 122     p_input->b_error    = 0;
 123     p_input->b_eof      = 0;
 124
 125     /* Set target */
 126     p_input->psz_source = strdup( p_item->psz_name );
 127
 128     /* Set status */
 129     p_input->i_status   = THREAD_CREATE;
 130
 131     /* Demux */
 132     p_input->p_demux_module = NULL;
 133     p_input->pf_init    = NULL;
 134     p_input->pf_end     = NULL;
 135     p_input->pf_demux   = NULL;
 136     p_input->pf_rewind  = NULL;
 137
 138     /* Access */
 139     p_input->p_access_module = NULL;
 140     p_input->pf_open        = NULL;
 141     p_input->pf_close       = NULL;
 142     p_input->pf_read        = NULL;
 143     p_input->pf_seek        = NULL;
 144     p_input->pf_set_area    = NULL;
 145     p_input->pf_set_program = NULL;
 146
 147     p_input->i_bufsize = 0;
 148     p_input->i_mtu = 0;
 149
 150     /* Initialize statistics */
 151     p_input->c_loops                    = 0;
 152     p_input->stream.c_packets_read      = 0;
 153     p_input->stream.c_packets_trashed   = 0;
 154
 155     /* Set locks. */
 156     vlc_mutex_init( &p_input->stream.stream_lock );
 157     vlc_cond_init( &p_input->stream.stream_wait );
 158     vlc_mutex_init( &p_input->stream.control.control_lock );
 159
 160     /* Initialize stream description */
 161     p_input->stream.b_changed = 0;
 162     p_input->stream.i_es_number = 0;
 163     p_input->stream.i_selected_es_number = 0;
 164     p_input->stream.i_pgrm_number = 0;
 165     p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
 166     p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 167     p_input->stream.i_mux_rate = 0;
 168
 169     /* no stream, no program, no area, no es */
 170     p_input->stream.p_new_program = NULL;
 171
 172     p_input->stream.i_area_nb = 0;
 173     p_input->stream.pp_areas = NULL;
 174     p_input->stream.p_selected_area = NULL;
 175     p_input->stream.p_new_area = NULL;
 176
 177     p_input->stream.pp_selected_es = NULL;
 178     p_input->stream.p_removed_es = NULL;
 179     p_input->stream.p_newly_selected_es = NULL;
 180
 181     /* By default there is one area in a stream */
 182     input_AddArea( p_input );
 183     p_input->stream.p_selected_area = p_input->stream.pp_areas[0];
 184
 185     /* Initialize stream control properties. */
 186     p_input->stream.control.i_status = PLAYING_S;
 187     p_input->stream.control.i_rate = DEFAULT_RATE;
 188     p_input->stream.control.b_mute = 0;
 189     p_input->stream.control.b_grayscale = config_GetIntVariable( "grayscale" );
 190     p_input->stream.control.i_smp = config_GetIntVariable( "vdec_smp" );
 191
 192     intf_WarnMsg( 1, "input: playlist item `%s'", p_input->psz_source );
 193
 194     /* Create thread. */
 195     if( vlc_thread_create( &p_input->thread_id, "input",
 196                            (vlc_thread_func_t)RunThread, (void *) p_input ) )
 197     {
 198         intf_ErrMsg( "input error: can't create input thread (%s)",
 199                      strerror(errno) );
 200         free( p_input );
 201         return( NULL );
 202     }
 203
 204 #if 0
 205     /* If status is NULL, wait until the thread is created */
 206     if( pi_status == NULL )
 207     {
 208         do
 209         {
 210             msleep( THREAD_SLEEP );
 211         } while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
 212                 && (i_status != THREAD_FATAL) );
 213     }
 214 #endif
 215
 216     return( p_input );
 217 }
 218
 219 /*****************************************************************************
 220  * input_StopThread: mark an input thread as zombie
 221  *****************************************************************************
 222  * This function should not return until the thread is effectively cancelled.
 223  *****************************************************************************/
 224 void input_StopThread( input_thread_t *p_input, int *pi_status )
 225 {
 226     /* Make the thread exit from a possible vlc_cond_wait() */
 227     vlc_mutex_lock( &p_input->stream.stream_lock );
 228
 229     /* Request thread destruction */
 230     p_input->b_die = 1;
 231
 232     vlc_cond_signal( &p_input->stream.stream_wait );
 233     vlc_mutex_unlock( &p_input->stream.stream_lock );
 234
 235     /* If status is NULL, wait until thread has been destroyed */
 236 #if 0
 237     if( pi_status == NULL )
 238     {
 239         do
 240         {
 241             msleep( THREAD_SLEEP );
 242         } while ( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
 243                   && (i_status != THREAD_FATAL) );
 244     }
 245 #endif
 246 }
 247
 248 /*****************************************************************************
 249  * input_DestroyThread: mark an input thread as zombie
 250  *****************************************************************************
 251  * This function should not return until the thread is effectively cancelled.
 252  *****************************************************************************/
 253 void input_DestroyThread( input_thread_t *p_input )
 254 {
 255     /* Join the thread */
 256     vlc_thread_join( p_input->thread_id );
 257
 258     /* Destroy Mutex locks */
 259     vlc_mutex_destroy( &p_input->stream.control.control_lock );
 260     vlc_cond_destroy( &p_input->stream.stream_wait );
 261     vlc_mutex_destroy( &p_input->stream.stream_lock );
 262
 263     /* Free input structure */
 264     free( p_input );
 265 }
 266
 267 /*****************************************************************************
 268  * RunThread: main thread loop
 269  *****************************************************************************
 270  * Thread in charge of processing the network packets and demultiplexing.
 271  *****************************************************************************/
 272 static int RunThread( input_thread_t *p_input )
 273 {
 274     if( InitThread( p_input ) )
 275     {
 276         /* If we failed, wait before we are killed, and exit */
 277         p_input->i_status = THREAD_ERROR;
 278         p_input->b_error = 1;
 279         ErrorThread( p_input );
 280         DestroyThread( p_input );
 281         return 0;
 282     }
 283
 284     p_input->i_status = THREAD_READY;
 285
 286     /* initialization is complete */
 287     vlc_mutex_lock( &p_input->stream.stream_lock );
 288     p_input->stream.b_changed = 1;
 289     vlc_mutex_unlock( &p_input->stream.stream_lock );
 290
 291     while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
 292     {
 293         int i, i_count;
 294
 295         p_input->c_loops++;
 296
 297         vlc_mutex_lock( &p_input->stream.stream_lock );
 298
 299         if( p_input->stream.p_new_program )
 300         {
 301             if( p_input->pf_set_program != NULL )
 302             {
 303
 304                 p_input->pf_set_program( p_input,
 305                         p_input->stream.p_new_program );
 306
 307                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 308                 {
 309                     pgrm_descriptor_t * p_pgrm
 310                                             = p_input->stream.pp_programs[i];
 311                     /* Escape all decoders for the stream discontinuity they
 312                      * will encounter. */
 313                     input_EscapeDiscontinuity( p_input, p_pgrm );
 314
 315                     /* Reinitialize synchro. */
 316                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 317                 }
 318             }
 319             p_input->stream.p_new_program = NULL;
 320         }
 321
 322         if( p_input->stream.p_new_area )
 323         {
 324             if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
 325             {
 326                 input_AccessReinit( p_input );
 327
 328                 p_input->pf_set_area( p_input, p_input->stream.p_new_area );
 329
 330                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 331                 {
 332                     pgrm_descriptor_t * p_pgrm
 333                                             = p_input->stream.pp_programs[i];
 334                     /* Escape all decoders for the stream discontinuity they
 335                      * will encounter. */
 336                     input_EscapeDiscontinuity( p_input, p_pgrm );
 337
 338                     /* Reinitialize synchro. */
 339                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 340                 }
 341             }
 342             p_input->stream.p_new_area = NULL;
 343         }
 344
 345         if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
 346         {
 347             if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
 348             {
 349                 off_t i_new_pos;
 350
 351                 /* Reinitialize buffer manager. */
 352                 input_AccessReinit( p_input );
 353
 354                 i_new_pos = p_input->stream.p_selected_area->i_seek;
 355                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 356                 p_input->pf_seek( p_input, i_new_pos );
 357                 vlc_mutex_lock( &p_input->stream.stream_lock );
 358
 359                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 360                 {
 361                     pgrm_descriptor_t * p_pgrm
 362                                             = p_input->stream.pp_programs[i];
 363                     /* Escape all decoders for the stream discontinuity they
 364                      * will encounter. */
 365                     input_EscapeDiscontinuity( p_input, p_pgrm );
 366
 367                     /* Reinitialize synchro. */
 368                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 369                 }
 370             }
 371             p_input->stream.p_selected_area->i_seek = NO_SEEK;
 372         }
 373
 374         if( p_input->stream.p_removed_es )
 375         {
 376             input_UnselectES( p_input, p_input->stream.p_removed_es );
 377             p_input->stream.p_removed_es = NULL;
 378         }
 379
 380         if( p_input->stream.p_newly_selected_es )
 381         {
 382             input_SelectES( p_input, p_input->stream.p_newly_selected_es );
 383             p_input->stream.p_newly_selected_es = NULL;
 384         }
 385
 386         if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
 387         {
 388             if( p_input->stream.b_new_mute )
 389             {
 390                 input_EscapeAudioDiscontinuity( p_input );
 391             }
 392
 393             vlc_mutex_lock( &p_input->stream.control.control_lock );
 394             p_input->stream.control.b_mute = p_input->stream.b_new_mute;
 395             vlc_mutex_unlock( &p_input->stream.control.control_lock );
 396
 397             p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 398         }
 399
 400         vlc_mutex_unlock( &p_input->stream.stream_lock );
 401
 402         /* Read and demultiplex some data. */
 403         i_count = p_input->pf_demux( p_input );
 404
 405         if( i_count == 0 && p_input->stream.b_seekable )
 406         {
 407             /* End of file - we do not set b_die because only the
 408              * interface is allowed to do so. */
 409             intf_WarnMsg( 3, "input: EOF reached" );
 410             p_input->b_eof = 1;
 411         }
 412         else if( i_count < 0 )
 413         {
 414             p_input->b_error = 1;
 415         }
 416     }
 417
 418     if( p_input->b_error || p_input->b_eof )
 419     {
 420         ErrorThread( p_input );
 421     }
 422
 423     EndThread( p_input );
 424
 425     DestroyThread( p_input );
 426
 427     return 0;
 428 }
 429
 430 /*****************************************************************************
 431  * InitThread: init the input Thread
 432  *****************************************************************************/
 433 static int InitThread( input_thread_t * p_input )
 434 {
 435     /* Parse source string. Syntax : [[<access>][/<demux>]:][<source>] */
 436     char * psz_parser = p_input->psz_source;
 437
 438     /* Skip the plug-in names */
 439     while( *psz_parser && *psz_parser != ':' )
 440     {
 441         psz_parser++;
 442     }
 443 #ifdef WIN32
 444     if( psz_parser - p_input->psz_source == 1 )
 445     {
 446         intf_WarnMsg( 2, "Drive letter %c: specified in source string",
 447                       p_input->psz_source ) ;
 448         psz_parser = "";
 449     }
 450 #endif
 451
 452     if( !*psz_parser )
 453     {
 454         p_input->psz_access = p_input->psz_demux = "";
 455         p_input->psz_name = p_input->psz_source;
 456     }
 457     else
 458     {
 459         *psz_parser++ = '\0';
 460
 461         /* let's skip '//' */
 462         if( psz_parser[0] == '/' && psz_parser[1] == '/' )
 463         {
 464             psz_parser += 2 ;
 465         }
 466
 467         p_input->psz_name = psz_parser ;
 468
 469         /* Come back to parse the access and demux plug-ins */
 470         psz_parser = p_input->psz_source;
 471
 472         if( !*psz_parser )
 473         {
 474             /* No access */
 475             p_input->psz_access = "";
 476         }
 477         else if( *psz_parser == '/' )
 478         {
 479             /* No access */
 480             p_input->psz_access = "";
 481             psz_parser++;
 482         }
 483         else
 484         {
 485             p_input->psz_access = psz_parser;
 486
 487             while( *psz_parser && *psz_parser != '/' )
 488             {
 489                 psz_parser++;
 490             }
 491
 492             if( *psz_parser == '/' )
 493             {
 494                 *psz_parser++ = '\0';
 495             }
 496         }
 497
 498         if( !*psz_parser )
 499         {
 500             /* No demux */
 501             p_input->psz_demux = "";
 502         }
 503         else
 504         {
 505             p_input->psz_demux = psz_parser;
 506         }
 507     }
 508
 509     intf_WarnMsg( 2, "input: access `%s', demux `%s', name `%s'",
 510                   p_input->psz_access, p_input->psz_demux,
 511                   p_input->psz_name );
 512
 513     if( input_AccessInit( p_input ) == -1 )
 514     {
 515         return( -1 );
 516     }
 517
 518     /* Find and open appropriate access plug-in. */
 519     p_input->p_access_module = module_Need( MODULE_CAPABILITY_ACCESS,
 520                                  p_input->psz_access,
 521                                  (void *)p_input );
 522
 523     if( p_input->p_access_module == NULL )
 524     {
 525         intf_ErrMsg( "input error: no suitable access plug-in for `%s/%s:%s'",
 526                      p_input->psz_access, p_input->psz_demux,
 527                      p_input->psz_name );
 528         return( -1 );
 529     }
 530
 531 #define f p_input->p_access_module->p_functions->access.functions.access
 532     p_input->pf_open          = f.pf_open;
 533     p_input->pf_close         = f.pf_close;
 534     p_input->pf_read          = f.pf_read;
 535     p_input->pf_set_area      = f.pf_set_area;
 536     p_input->pf_set_program   = f.pf_set_program;
 537     p_input->pf_seek          = f.pf_seek;
 538 #undef f
 539
 540     /* Waiting for stream. */
 541     if( p_input->i_mtu )
 542     {
 543         p_input->i_bufsize = p_input->i_mtu;
 544     }
 545     else
 546     {
 547         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
 548     }
 549
 550     if( p_input->p_current_data == NULL && p_input->pf_read != NULL )
 551     {
 552         while( !input_FillBuffer( p_input ) )
 553         {
 554             if( p_input->b_die || p_input->b_error )
 555             {
 556                 module_Unneed( p_input->p_access_module );
 557                 return( -1 );
 558             }
 559         }
 560     }
 561
 562     /* Find and open appropriate demux plug-in. */
 563     p_input->p_demux_module = module_Need( MODULE_CAPABILITY_DEMUX,
 564                                  p_input->psz_demux,
 565                                  (void *)p_input );
 566
 567     if( p_input->p_demux_module == NULL )
 568     {
 569         intf_ErrMsg( "input error: no suitable demux plug-in for `%s/%s:%s'",
 570                      p_input->psz_access, p_input->psz_demux,
 571                      p_input->psz_name );
 572         module_Unneed( p_input->p_access_module );
 573         return( -1 );
 574     }
 575
 576 #define f p_input->p_demux_module->p_functions->demux.functions.demux
 577     p_input->pf_init          = f.pf_init;
 578     p_input->pf_end           = f.pf_end;
 579     p_input->pf_demux         = f.pf_demux;
 580     p_input->pf_rewind        = f.pf_rewind;
 581 #undef f
 582
 583     return( 0 );
 584 }
 585
 586 /*****************************************************************************
 587  * ErrorThread: RunThread() error loop
 588  *****************************************************************************
 589  * This function is called when an error occured during thread main's loop.
 590  *****************************************************************************/
 591 static void ErrorThread( input_thread_t *p_input )
 592 {
 593     while( !p_input->b_die )
 594     {
 595         /* Sleep a while */
 596         msleep( INPUT_IDLE_SLEEP );
 597     }
 598 }
 599
 600 /*****************************************************************************
 601  * EndThread: end the input thread
 602  *****************************************************************************/
 603 static void EndThread( input_thread_t * p_input )
 604 {
 605     /* Store status */
 606     p_input->i_status = THREAD_END;
 607
 608     if( p_main->b_stats )
 609     {
 610 #ifdef HAVE_SYS_TIMES_H
 611         /* Display statistics */
 612         struct tms  cpu_usage;
 613         times( &cpu_usage );
 614
 615         intf_StatMsg( "input stats: %d loops consuming user: %d, system: %d",
 616                       p_input->c_loops,
 617                       cpu_usage.tms_utime, cpu_usage.tms_stime );
 618 #else
 619         intf_StatMsg( "input stats: %d loops", p_input->c_loops );
 620 #endif
 621
 622         input_DumpStream( p_input );
 623     }
 624
 625     /* Free all ES and destroy all decoder threads */
 626     input_EndStream( p_input );
 627
 628     /* Free demultiplexer's data */
 629     p_input->pf_end( p_input );
 630     module_Unneed( p_input->p_demux_module );
 631
 632     /* Close the access plug-in */
 633     CloseThread( p_input );
 634 }
 635
 636 /*****************************************************************************
 637  * CloseThread: close the target
 638  *****************************************************************************/
 639 static void CloseThread( input_thread_t * p_input )
 640 {
 641     p_input->pf_close( p_input );
 642     module_Unneed( p_input->p_access_module );
 643
 644     input_AccessEnd( p_input );
 645
 646     free( p_input->psz_source );
 647 }
 648
 649 /*****************************************************************************
 650  * DestroyThread: destroy the input thread
 651  *****************************************************************************/
 652 static void DestroyThread( input_thread_t * p_input )
 653 {
 654     /* Update status */
 655     p_input->i_status = THREAD_OVER;
 656 }
 657