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 1.193 2002/04/08 14:53:05 jobi 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                 /* Reinitialize buffer manager. */
 305                 input_AccessReinit( p_input );
 306
 307                 p_input->pf_set_program( p_input,
 308                         p_input->stream.p_new_program );
 309
 310                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 311                 {
 312                     pgrm_descriptor_t * p_pgrm
 313                                             = p_input->stream.pp_programs[i];
 314                     /* Escape all decoders for the stream discontinuity they
 315                      * will encounter. */
 316                     input_EscapeDiscontinuity( p_input, p_pgrm );
 317
 318                     /* Reinitialize synchro. */
 319                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 320                 }
 321             }
 322             p_input->stream.p_new_program = NULL;
 323         }
 324
 325         if( p_input->stream.p_new_area )
 326         {
 327             if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
 328             {
 329                 input_AccessReinit( p_input );
 330
 331                 p_input->pf_set_area( p_input, p_input->stream.p_new_area );
 332
 333                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 334                 {
 335                     pgrm_descriptor_t * p_pgrm
 336                                             = p_input->stream.pp_programs[i];
 337                     /* Escape all decoders for the stream discontinuity they
 338                      * will encounter. */
 339                     input_EscapeDiscontinuity( p_input, p_pgrm );
 340
 341                     /* Reinitialize synchro. */
 342                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 343                 }
 344             }
 345             p_input->stream.p_new_area = NULL;
 346         }
 347
 348         if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
 349         {
 350             if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
 351             {
 352                 off_t i_new_pos;
 353
 354                 /* Reinitialize buffer manager. */
 355                 input_AccessReinit( p_input );
 356
 357                 i_new_pos = p_input->stream.p_selected_area->i_seek;
 358                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 359                 p_input->pf_seek( p_input, i_new_pos );
 360                 vlc_mutex_lock( &p_input->stream.stream_lock );
 361
 362                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 363                 {
 364                     pgrm_descriptor_t * p_pgrm
 365                                             = p_input->stream.pp_programs[i];
 366                     /* Escape all decoders for the stream discontinuity they
 367                      * will encounter. */
 368                     input_EscapeDiscontinuity( p_input, p_pgrm );
 369
 370                     /* Reinitialize synchro. */
 371                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 372                 }
 373             }
 374             p_input->stream.p_selected_area->i_seek = NO_SEEK;
 375         }
 376
 377         if( p_input->stream.p_removed_es )
 378         {
 379             input_UnselectES( p_input, p_input->stream.p_removed_es );
 380             p_input->stream.p_removed_es = NULL;
 381         }
 382
 383         if( p_input->stream.p_newly_selected_es )
 384         {
 385             input_SelectES( p_input, p_input->stream.p_newly_selected_es );
 386             p_input->stream.p_newly_selected_es = NULL;
 387         }
 388
 389         if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
 390         {
 391             if( p_input->stream.b_new_mute )
 392             {
 393                 input_EscapeAudioDiscontinuity( p_input );
 394             }
 395
 396             vlc_mutex_lock( &p_input->stream.control.control_lock );
 397             p_input->stream.control.b_mute = p_input->stream.b_new_mute;
 398             vlc_mutex_unlock( &p_input->stream.control.control_lock );
 399
 400             p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 401         }
 402
 403         vlc_mutex_unlock( &p_input->stream.stream_lock );
 404
 405         /* Read and demultiplex some data. */
 406         i_count = p_input->pf_demux( p_input );
 407
 408         if( i_count == 0 && p_input->stream.b_seekable )
 409         {
 410             /* End of file - we do not set b_die because only the
 411              * interface is allowed to do so. */
 412             intf_WarnMsg( 3, "input: EOF reached" );
 413             p_input->b_eof = 1;
 414         }
 415         else if( i_count < 0 )
 416         {
 417             p_input->b_error = 1;
 418         }
 419     }
 420
 421     if( p_input->b_error || p_input->b_eof )
 422     {
 423         ErrorThread( p_input );
 424     }
 425
 426     EndThread( p_input );
 427
 428     DestroyThread( p_input );
 429
 430     return 0;
 431 }
 432
 433 /*****************************************************************************
 434  * InitThread: init the input Thread
 435  *****************************************************************************/
 436 static int InitThread( input_thread_t * p_input )
 437 {
 438     /* Parse source string. Syntax : [[<access>][/<demux>]:][<source>] */
 439     char * psz_parser = p_input->psz_source;
 440
 441     /* Skip the plug-in names */
 442     while( *psz_parser && *psz_parser != ':' )
 443     {
 444         psz_parser++;
 445     }
 446 #ifdef WIN32
 447     if( psz_parser - p_input->psz_source == 1 )
 448     {
 449         intf_WarnMsg( 2, "Drive letter %c: specified in source string",
 450                       p_input->psz_source ) ;
 451         psz_parser = "";
 452     }
 453 #endif
 454
 455     if( !*psz_parser )
 456     {
 457         p_input->psz_access = p_input->psz_demux = "";
 458         p_input->psz_name = p_input->psz_source;
 459     }
 460     else
 461     {
 462         *psz_parser++ = '\0';
 463
 464         /* let's skip '//' */
 465         if( psz_parser[0] == '/' && psz_parser[1] == '/' )
 466         {
 467             psz_parser += 2 ;
 468         }
 469
 470         p_input->psz_name = psz_parser ;
 471
 472         /* Come back to parse the access and demux plug-ins */
 473         psz_parser = p_input->psz_source;
 474
 475         if( !*psz_parser )
 476         {
 477             /* No access */
 478             p_input->psz_access = "";
 479         }
 480         else if( *psz_parser == '/' )
 481         {
 482             /* No access */
 483             p_input->psz_access = "";
 484             psz_parser++;
 485         }
 486         else
 487         {
 488             p_input->psz_access = psz_parser;
 489
 490             while( *psz_parser && *psz_parser != '/' )
 491             {
 492                 psz_parser++;
 493             }
 494
 495             if( *psz_parser == '/' )
 496             {
 497                 *psz_parser++ = '\0';
 498             }
 499         }
 500
 501         if( !*psz_parser )
 502         {
 503             /* No demux */
 504             p_input->psz_demux = "";
 505         }
 506         else
 507         {
 508             p_input->psz_demux = psz_parser;
 509         }
 510     }
 511
 512     intf_WarnMsg( 2, "input: access `%s', demux `%s', name `%s'",
 513                   p_input->psz_access, p_input->psz_demux,
 514                   p_input->psz_name );
 515
 516     if( input_AccessInit( p_input ) == -1 )
 517     {
 518         return( -1 );
 519     }
 520
 521     /* Find and open appropriate access plug-in. */
 522     p_input->p_access_module = module_Need( MODULE_CAPABILITY_ACCESS,
 523                                  p_input->psz_access,
 524                                  (void *)p_input );
 525
 526     if( p_input->p_access_module == NULL )
 527     {
 528         intf_ErrMsg( "input error: no suitable access plug-in for `%s/%s:%s'",
 529                      p_input->psz_access, p_input->psz_demux,
 530                      p_input->psz_name );
 531         return( -1 );
 532     }
 533
 534 #define f p_input->p_access_module->p_functions->access.functions.access
 535     p_input->pf_open          = f.pf_open;
 536     p_input->pf_close         = f.pf_close;
 537     p_input->pf_read          = f.pf_read;
 538     p_input->pf_set_area      = f.pf_set_area;
 539     p_input->pf_set_program   = f.pf_set_program;
 540     p_input->pf_seek          = f.pf_seek;
 541 #undef f
 542
 543     /* Waiting for stream. */
 544     if( p_input->i_mtu )
 545     {
 546         p_input->i_bufsize = p_input->i_mtu;
 547     }
 548     else
 549     {
 550         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
 551     }
 552
 553     if( p_input->p_current_data == NULL && p_input->pf_read != NULL )
 554     {
 555         while( !input_FillBuffer( p_input ) )
 556         {
 557             if( p_input->b_die || p_input->b_error )
 558             {
 559                 module_Unneed( p_input->p_access_module );
 560                 return( -1 );
 561             }
 562         }
 563     }
 564
 565     /* Find and open appropriate demux plug-in. */
 566     p_input->p_demux_module = module_Need( MODULE_CAPABILITY_DEMUX,
 567                                  p_input->psz_demux,
 568                                  (void *)p_input );
 569
 570     if( p_input->p_demux_module == NULL )
 571     {
 572         intf_ErrMsg( "input error: no suitable demux plug-in for `%s/%s:%s'",
 573                      p_input->psz_access, p_input->psz_demux,
 574                      p_input->psz_name );
 575         module_Unneed( p_input->p_access_module );
 576         return( -1 );
 577     }
 578
 579 #define f p_input->p_demux_module->p_functions->demux.functions.demux
 580     p_input->pf_init          = f.pf_init;
 581     p_input->pf_end           = f.pf_end;
 582     p_input->pf_demux         = f.pf_demux;
 583     p_input->pf_rewind        = f.pf_rewind;
 584 #undef f
 585
 586     return( 0 );
 587 }
 588
 589 /*****************************************************************************
 590  * ErrorThread: RunThread() error loop
 591  *****************************************************************************
 592  * This function is called when an error occured during thread main's loop.
 593  *****************************************************************************/
 594 static void ErrorThread( input_thread_t *p_input )
 595 {
 596     while( !p_input->b_die )
 597     {
 598         /* Sleep a while */
 599         msleep( INPUT_IDLE_SLEEP );
 600     }
 601 }
 602
 603 /*****************************************************************************
 604  * EndThread: end the input thread
 605  *****************************************************************************/
 606 static void EndThread( input_thread_t * p_input )
 607 {
 608     /* Store status */
 609     p_input->i_status = THREAD_END;
 610
 611     if( p_main->b_stats )
 612     {
 613 #ifdef HAVE_SYS_TIMES_H
 614         /* Display statistics */
 615         struct tms  cpu_usage;
 616         times( &cpu_usage );
 617
 618         intf_StatMsg( "input stats: %d loops consuming user: %d, system: %d",
 619                       p_input->c_loops,
 620                       cpu_usage.tms_utime, cpu_usage.tms_stime );
 621 #else
 622         intf_StatMsg( "input stats: %d loops", p_input->c_loops );
 623 #endif
 624
 625         input_DumpStream( p_input );
 626     }
 627
 628     /* Free all ES and destroy all decoder threads */
 629     input_EndStream( p_input );
 630
 631     /* Free demultiplexer's data */
 632     p_input->pf_end( p_input );
 633     module_Unneed( p_input->p_demux_module );
 634
 635     /* Close the access plug-in */
 636     CloseThread( p_input );
 637 }
 638
 639 /*****************************************************************************
 640  * CloseThread: close the target
 641  *****************************************************************************/
 642 static void CloseThread( input_thread_t * p_input )
 643 {
 644     p_input->pf_close( p_input );
 645     module_Unneed( p_input->p_access_module );
 646
 647     input_AccessEnd( p_input );
 648
 649     free( p_input->psz_source );
 650 }
 651
 652 /*****************************************************************************
 653  * DestroyThread: destroy the input thread
 654  *****************************************************************************/
 655 static void DestroyThread( input_thread_t * p_input )
 656 {
 657     /* Update status */
 658     p_input->i_status = THREAD_OVER;
 659 }
 660