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 1.191 2002/03/18 21:04:01 xav 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( "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                 p_input->pf_set_program( p_input,
 306                         p_input->stream.p_new_program );
 307
 308                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 309                 {
 310                     pgrm_descriptor_t * p_pgrm
 311                                             = p_input->stream.pp_programs[i];
 312                     /* Escape all decoders for the stream discontinuity they
 313                      * will encounter. */
 314                     input_EscapeDiscontinuity( p_input, p_pgrm );
 315
 316                     /* Reinitialize synchro. */
 317                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 318                 }
 319             }
 320             p_input->stream.p_new_program = NULL;
 321         }
 322
 323         if( p_input->stream.p_new_area )
 324         {
 325             if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
 326             {
 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                 input_AccessReinit( p_input );
 343             }
 344             p_input->stream.p_new_area = NULL;
 345         }
 346
 347         if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
 348         {
 349             if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
 350             {
 351                 off_t i_new_pos = p_input->stream.p_selected_area->i_seek;
 352                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 353                 p_input->pf_seek( p_input, i_new_pos );
 354                 vlc_mutex_lock( &p_input->stream.stream_lock );
 355
 356                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 357                 {
 358                     pgrm_descriptor_t * p_pgrm
 359                                             = p_input->stream.pp_programs[i];
 360                     /* Escape all decoders for the stream discontinuity they
 361                      * will encounter. */
 362                     input_EscapeDiscontinuity( p_input, p_pgrm );
 363
 364                     /* Reinitialize synchro. */
 365                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 366                 }
 367
 368                 /* Reinitialize buffer manager. */
 369                 input_AccessReinit( p_input );
 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