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 1.197 2002/05/21 01:40:17 sam 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     p_input->stream.b_seekable = 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( "grayscale" );
 191     p_input->stream.control.i_smp = config_GetIntVariable( "vdec-smp" );
 192
 193     intf_WarnMsg( 1, "input: playlist item `%s'", p_input->psz_source );
 194
 195     /* Create thread. */
 196     if( vlc_thread_create( &p_input->thread_id, "input",
 197                            (vlc_thread_func_t)RunThread, (void *) p_input ) )
 198     {
 199         intf_ErrMsg( "input error: can't create input thread (%s)",
 200                      strerror(errno) );
 201         free( p_input );
 202         return( NULL );
 203     }
 204
 205 #if 0
 206     /* If status is NULL, wait until the thread is created */
 207     if( pi_status == NULL )
 208     {
 209         do
 210         {
 211             msleep( THREAD_SLEEP );
 212         } while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
 213                 && (i_status != THREAD_FATAL) );
 214     }
 215 #endif
 216
 217     return( p_input );
 218 }
 219
 220 /*****************************************************************************
 221  * input_StopThread: mark an input thread as zombie
 222  *****************************************************************************
 223  * This function should not return until the thread is effectively cancelled.
 224  *****************************************************************************/
 225 void input_StopThread( input_thread_t *p_input, int *pi_status )
 226 {
 227     /* Make the thread exit from a possible vlc_cond_wait() */
 228     vlc_mutex_lock( &p_input->stream.stream_lock );
 229
 230     /* Request thread destruction */
 231     p_input->b_die = 1;
 232
 233     vlc_cond_signal( &p_input->stream.stream_wait );
 234     vlc_mutex_unlock( &p_input->stream.stream_lock );
 235
 236     /* If status is NULL, wait until thread has been destroyed */
 237 #if 0
 238     if( pi_status == NULL )
 239     {
 240         do
 241         {
 242             msleep( THREAD_SLEEP );
 243         } while ( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
 244                   && (i_status != THREAD_FATAL) );
 245     }
 246 #endif
 247 }
 248
 249 /*****************************************************************************
 250  * input_DestroyThread: mark an input thread as zombie
 251  *****************************************************************************
 252  * This function should not return until the thread is effectively cancelled.
 253  *****************************************************************************/
 254 void input_DestroyThread( input_thread_t *p_input )
 255 {
 256     /* Join the thread */
 257     vlc_thread_join( p_input->thread_id );
 258
 259     /* Destroy Mutex locks */
 260     vlc_mutex_destroy( &p_input->stream.control.control_lock );
 261     vlc_cond_destroy( &p_input->stream.stream_wait );
 262     vlc_mutex_destroy( &p_input->stream.stream_lock );
 263
 264     /* Free input structure */
 265     free( p_input );
 266 }
 267
 268 /*****************************************************************************
 269  * RunThread: main thread loop
 270  *****************************************************************************
 271  * Thread in charge of processing the network packets and demultiplexing.
 272  *****************************************************************************/
 273 static int RunThread( input_thread_t *p_input )
 274 {
 275     if( InitThread( p_input ) )
 276     {
 277         /* If we failed, wait before we are killed, and exit */
 278         p_input->i_status = THREAD_ERROR;
 279         p_input->b_error = 1;
 280         ErrorThread( p_input );
 281         DestroyThread( p_input );
 282         return 0;
 283     }
 284
 285     p_input->i_status = THREAD_READY;
 286
 287     /* initialization is complete */
 288     vlc_mutex_lock( &p_input->stream.stream_lock );
 289     p_input->stream.b_changed = 1;
 290     vlc_mutex_unlock( &p_input->stream.stream_lock );
 291
 292     while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
 293     {
 294         int i, i_count;
 295
 296         p_input->c_loops++;
 297
 298         vlc_mutex_lock( &p_input->stream.stream_lock );
 299
 300         if( p_input->stream.p_new_program )
 301         {
 302             if( p_input->pf_set_program != NULL )
 303             {
 304
 305                 /* Reinitialize buffer manager. */
 306                 input_AccessReinit( p_input );
 307
 308                 p_input->pf_set_program( p_input,
 309                         p_input->stream.p_new_program );
 310
 311                 /* Escape all decoders for the stream discontinuity they
 312                  * will encounter. */
 313                 input_EscapeDiscontinuity( p_input );
 314
 315                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 316                 {
 317                     pgrm_descriptor_t * p_pgrm
 318                                             = p_input->stream.pp_programs[i];
 319
 320                     /* Reinitialize synchro. */
 321                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 322                 }
 323             }
 324             p_input->stream.p_new_program = NULL;
 325         }
 326
 327         if( p_input->stream.p_new_area )
 328         {
 329             if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
 330             {
 331                 input_AccessReinit( p_input );
 332
 333                 p_input->pf_set_area( p_input, p_input->stream.p_new_area );
 334
 335                 /* Escape all decoders for the stream discontinuity they
 336                  * will encounter. */
 337                 input_EscapeDiscontinuity( p_input );
 338
 339                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 340                 {
 341                     pgrm_descriptor_t * p_pgrm
 342                                             = p_input->stream.pp_programs[i];
 343
 344                     /* Reinitialize synchro. */
 345                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 346                 }
 347             }
 348             p_input->stream.p_new_area = NULL;
 349         }
 350
 351         if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
 352         {
 353             if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
 354             {
 355                 off_t i_new_pos;
 356
 357                 /* Reinitialize buffer manager. */
 358                 input_AccessReinit( p_input );
 359
 360                 i_new_pos = p_input->stream.p_selected_area->i_seek;
 361                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 362                 p_input->pf_seek( p_input, i_new_pos );
 363                 vlc_mutex_lock( &p_input->stream.stream_lock );
 364
 365                 /* Escape all decoders for the stream discontinuity they
 366                  * will encounter. */
 367                 input_EscapeDiscontinuity( p_input );
 368
 369                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 370                 {
 371                     pgrm_descriptor_t * p_pgrm
 372                                             = p_input->stream.pp_programs[i];
 373
 374                     /* Reinitialize synchro. */
 375                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 376                 }
 377             }
 378             p_input->stream.p_selected_area->i_seek = NO_SEEK;
 379         }
 380
 381         if( p_input->stream.p_removed_es )
 382         {
 383             input_UnselectES( p_input, p_input->stream.p_removed_es );
 384             p_input->stream.p_removed_es = NULL;
 385         }
 386
 387         if( p_input->stream.p_newly_selected_es )
 388         {
 389             input_SelectES( p_input, p_input->stream.p_newly_selected_es );
 390             p_input->stream.p_newly_selected_es = NULL;
 391         }
 392
 393         if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
 394         {
 395             if( p_input->stream.b_new_mute )
 396             {
 397                 input_EscapeAudioDiscontinuity( p_input );
 398             }
 399
 400             vlc_mutex_lock( &p_input->stream.control.control_lock );
 401             p_input->stream.control.b_mute = p_input->stream.b_new_mute;
 402             vlc_mutex_unlock( &p_input->stream.control.control_lock );
 403
 404             p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 405         }
 406
 407         vlc_mutex_unlock( &p_input->stream.stream_lock );
 408
 409         /* Read and demultiplex some data. */
 410         i_count = p_input->pf_demux( p_input );
 411
 412         if( i_count == 0 && p_input->stream.b_seekable )
 413         {
 414             /* End of file - we do not set b_die because only the
 415              * interface is allowed to do so. */
 416             intf_WarnMsg( 3, "input: EOF reached" );
 417             p_input->b_eof = 1;
 418         }
 419         else if( i_count < 0 )
 420         {
 421             p_input->b_error = 1;
 422         }
 423     }
 424
 425     if( p_input->b_error || p_input->b_eof )
 426     {
 427         ErrorThread( p_input );
 428     }
 429
 430     EndThread( p_input );
 431
 432     DestroyThread( p_input );
 433
 434     return 0;
 435 }
 436
 437 /*****************************************************************************
 438  * InitThread: init the input Thread
 439  *****************************************************************************/
 440 static int InitThread( input_thread_t * p_input )
 441 {
 442     /* Parse source string. Syntax : [[<access>][/<demux>]:][<source>] */
 443     char * psz_parser = p_input->psz_source;
 444
 445     /* Skip the plug-in names */
 446     while( *psz_parser && *psz_parser != ':' )
 447     {
 448         psz_parser++;
 449     }
 450 #ifdef WIN32
 451     if( psz_parser - p_input->psz_source == 1 )
 452     {
 453         intf_WarnMsg( 2, "Drive letter %c: specified in source string",
 454                       p_input->psz_source ) ;
 455         psz_parser = "";
 456     }
 457 #endif
 458
 459     if( !*psz_parser )
 460     {
 461         p_input->psz_access = p_input->psz_demux = "";
 462         p_input->psz_name = p_input->psz_source;
 463     }
 464     else
 465     {
 466         *psz_parser++ = '\0';
 467
 468         /* let's skip '//' */
 469         if( psz_parser[0] == '/' && psz_parser[1] == '/' )
 470         {
 471             psz_parser += 2 ;
 472         }
 473
 474         p_input->psz_name = psz_parser ;
 475
 476         /* Come back to parse the access and demux plug-ins */
 477         psz_parser = p_input->psz_source;
 478
 479         if( !*psz_parser )
 480         {
 481             /* No access */
 482             p_input->psz_access = "";
 483         }
 484         else if( *psz_parser == '/' )
 485         {
 486             /* No access */
 487             p_input->psz_access = "";
 488             psz_parser++;
 489         }
 490         else
 491         {
 492             p_input->psz_access = psz_parser;
 493
 494             while( *psz_parser && *psz_parser != '/' )
 495             {
 496                 psz_parser++;
 497             }
 498
 499             if( *psz_parser == '/' )
 500             {
 501                 *psz_parser++ = '\0';
 502             }
 503         }
 504
 505         if( !*psz_parser )
 506         {
 507             /* No demux */
 508             p_input->psz_demux = "";
 509         }
 510         else
 511         {
 512             p_input->psz_demux = psz_parser;
 513         }
 514     }
 515
 516     intf_WarnMsg( 2, "input: access `%s', demux `%s', name `%s'",
 517                   p_input->psz_access, p_input->psz_demux,
 518                   p_input->psz_name );
 519
 520     if( input_AccessInit( p_input ) == -1 )
 521     {
 522         return( -1 );
 523     }
 524
 525     /* Find and open appropriate access plug-in. */
 526     p_input->p_access_module = module_Need( MODULE_CAPABILITY_ACCESS,
 527                                  p_input->psz_access,
 528                                  (void *)p_input );
 529
 530     if( p_input->p_access_module == NULL )
 531     {
 532         intf_ErrMsg( "input error: no suitable access plug-in for `%s/%s:%s'",
 533                      p_input->psz_access, p_input->psz_demux,
 534                      p_input->psz_name );
 535         return( -1 );
 536     }
 537
 538 #define f p_input->p_access_module->p_functions->access.functions.access
 539     p_input->pf_open          = f.pf_open;
 540     p_input->pf_close         = f.pf_close;
 541     p_input->pf_read          = f.pf_read;
 542     p_input->pf_set_area      = f.pf_set_area;
 543     p_input->pf_set_program   = f.pf_set_program;
 544     p_input->pf_seek          = f.pf_seek;
 545 #undef f
 546
 547     /* Waiting for stream. */
 548     if( p_input->i_mtu )
 549     {
 550         p_input->i_bufsize = p_input->i_mtu;
 551     }
 552     else
 553     {
 554         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
 555     }
 556
 557     if( p_input->p_current_data == NULL && p_input->pf_read != NULL )
 558     {
 559         while( !input_FillBuffer( p_input ) )
 560         {
 561             if( p_input->b_die || p_input->b_error || p_input->b_eof )
 562             {
 563                 module_Unneed( p_input->p_access_module );
 564                 return( -1 );
 565             }
 566         }
 567     }
 568
 569     /* Find and open appropriate demux plug-in. */
 570     p_input->p_demux_module = module_Need( MODULE_CAPABILITY_DEMUX,
 571                                  p_input->psz_demux,
 572                                  (void *)p_input );
 573
 574     if( p_input->p_demux_module == NULL )
 575     {
 576         intf_ErrMsg( "input error: no suitable demux plug-in for `%s/%s:%s'",
 577                      p_input->psz_access, p_input->psz_demux,
 578                      p_input->psz_name );
 579         module_Unneed( p_input->p_access_module );
 580         return( -1 );
 581     }
 582
 583 #define f p_input->p_demux_module->p_functions->demux.functions.demux
 584     p_input->pf_init          = f.pf_init;
 585     p_input->pf_end           = f.pf_end;
 586     p_input->pf_demux         = f.pf_demux;
 587     p_input->pf_rewind        = f.pf_rewind;
 588 #undef f
 589
 590     return( 0 );
 591 }
 592
 593 /*****************************************************************************
 594  * ErrorThread: RunThread() error loop
 595  *****************************************************************************
 596  * This function is called when an error occured during thread main's loop.
 597  *****************************************************************************/
 598 static void ErrorThread( input_thread_t *p_input )
 599 {
 600     while( !p_input->b_die )
 601     {
 602         /* Sleep a while */
 603         msleep( INPUT_IDLE_SLEEP );
 604     }
 605 }
 606
 607 /*****************************************************************************
 608  * EndThread: end the input thread
 609  *****************************************************************************/
 610 static void EndThread( input_thread_t * p_input )
 611 {
 612     /* Store status */
 613     p_input->i_status = THREAD_END;
 614
 615     if( p_main->b_stats )
 616     {
 617 #ifdef HAVE_SYS_TIMES_H
 618         /* Display statistics */
 619         struct tms  cpu_usage;
 620         times( &cpu_usage );
 621
 622         intf_StatMsg( "input stats: %d loops consuming user: %d, system: %d",
 623                       p_input->c_loops,
 624                       cpu_usage.tms_utime, cpu_usage.tms_stime );
 625 #else
 626         intf_StatMsg( "input stats: %d loops", p_input->c_loops );
 627 #endif
 628
 629         input_DumpStream( p_input );
 630     }
 631
 632     /* Free all ES and destroy all decoder threads */
 633     input_EndStream( p_input );
 634
 635     /* Free demultiplexer's data */
 636     p_input->pf_end( p_input );
 637     module_Unneed( p_input->p_demux_module );
 638
 639     /* Close the access plug-in */
 640     CloseThread( p_input );
 641 }
 642
 643 /*****************************************************************************
 644  * CloseThread: close the target
 645  *****************************************************************************/
 646 static void CloseThread( input_thread_t * p_input )
 647 {
 648     p_input->pf_close( p_input );
 649     module_Unneed( p_input->p_access_module );
 650
 651     input_AccessEnd( p_input );
 652
 653     free( p_input->psz_source );
 654 }
 655
 656 /*****************************************************************************
 657  * DestroyThread: destroy the input thread
 658  *****************************************************************************/
 659 static void DestroyThread( input_thread_t * p_input )
 660 {
 661     /* Update status */
 662     p_input->i_status = THREAD_OVER;
 663 }
 664