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) 1998-2002 VideoLAN
   7  * $Id: input.c,v 1.214 2002/11/10 18:04:23 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
  31 #include <vlc/vlc.h>
  32
  33 #ifdef HAVE_SYS_TYPES_H
  34 #   include <sys/types.h>
  35 #endif
  36 #ifdef HAVE_SYS_STAT_H
  37 #   include <sys/stat.h>
  38 #endif
  39 #ifdef HAVE_FCNTL_H
  40 #   include <fcntl.h>
  41 #endif
  42
  43 #include <string.h>
  44
  45 #ifdef HAVE_SYS_TIMES_H
  46 #   include <sys/times.h>
  47 #endif
  48
  49 #include "netutils.h"
  50 #include "vlc_playlist.h"
  51
  52 #include "stream_control.h"
  53 #include "input_ext-intf.h"
  54 #include "input_ext-dec.h"
  55 #include "input_ext-plugins.h"
  56
  57 #include "stream_output.h"
  58
  59 #include "interface.h"
  60
  61 /*****************************************************************************
  62  * Local prototypes
  63  *****************************************************************************/
  64 static  int RunThread       ( input_thread_t *p_input );
  65 static  int InitThread      ( input_thread_t *p_input );
  66 static void ErrorThread     ( input_thread_t *p_input );
  67 static void EndThread       ( input_thread_t *p_input );
  68
  69 /*****************************************************************************
  70  * input_CreateThread: creates a new input thread
  71  *****************************************************************************
  72  * This function creates a new input, and returns a pointer
  73  * to its description. On error, it returns NULL.
  74  * If pi_status is NULL, then the function will block until the thread is ready.
  75  * If not, it will be updated using one of the THREAD_* constants.
  76  *****************************************************************************/
  77 input_thread_t *__input_CreateThread( vlc_object_t *p_parent,
  78                                       playlist_item_t *p_item, int *pi_status )
  79 {
  80     input_thread_t *    p_input;                        /* thread descriptor */
  81     input_info_category_t * p_info;
  82
  83     /* Allocate descriptor */
  84     p_input = vlc_object_create( p_parent, VLC_OBJECT_INPUT );
  85     if( p_input == NULL )
  86     {
  87         msg_Err( p_parent, "out of memory" );
  88         return NULL;
  89     }
  90
  91     /* Initialize thread properties */
  92     p_input->b_eof      = 0;
  93
  94     /* Set target */
  95     p_input->psz_source = strdup( p_item->psz_name );
  96
  97     /* Demux */
  98     p_input->p_demux = NULL;
  99
 100     /* Access */
 101     p_input->p_access = NULL;
 102
 103     p_input->i_bufsize = 0;
 104     p_input->i_mtu = 0;
 105
 106     /* Initialize statistics */
 107     p_input->c_loops                    = 0;
 108     p_input->stream.c_packets_read      = 0;
 109     p_input->stream.c_packets_trashed   = 0;
 110
 111     /* Set locks. */
 112     vlc_mutex_init( p_input, &p_input->stream.stream_lock );
 113     vlc_cond_init( p_input, &p_input->stream.stream_wait );
 114     vlc_mutex_init( p_input, &p_input->stream.control.control_lock );
 115
 116     /* Initialize stream description */
 117     p_input->stream.b_changed = 0;
 118     p_input->stream.i_es_number = 0;
 119     p_input->stream.i_selected_es_number = 0;
 120     p_input->stream.i_pgrm_number = 0;
 121     p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
 122     p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 123     p_input->stream.i_mux_rate = 0;
 124     p_input->stream.b_seekable = 0;
 125     p_input->stream.p_sout = NULL;
 126
 127     /* no stream, no program, no area, no es */
 128     p_input->stream.p_new_program = NULL;
 129
 130     p_input->stream.i_area_nb = 0;
 131     p_input->stream.pp_areas = NULL;
 132     p_input->stream.p_selected_area = NULL;
 133     p_input->stream.p_new_area = NULL;
 134
 135     p_input->stream.pp_selected_es = NULL;
 136     p_input->stream.p_removed_es = NULL;
 137     p_input->stream.p_newly_selected_es = NULL;
 138
 139     /* By default there is one area in a stream */
 140     input_AddArea( p_input );
 141     p_input->stream.p_selected_area = p_input->stream.pp_areas[0];
 142
 143     /* Initialize stream control properties. */
 144     p_input->stream.control.i_status = PLAYING_S;
 145     p_input->stream.control.i_rate = DEFAULT_RATE;
 146     p_input->stream.control.b_mute = 0;
 147     p_input->stream.control.b_grayscale = config_GetInt( p_input, "grayscale" );
 148
 149     /* Initialize input info */
 150     p_input->stream.p_info = malloc( sizeof( input_info_category_t ) );
 151     if( !p_input->stream.p_info )
 152     {
 153         msg_Err( p_input, "No memory!" );
 154         return NULL;
 155     }
 156     p_input->stream.p_info->psz_name = strdup("General") ;
 157     p_input->stream.p_info->p_info = NULL;
 158     p_input->stream.p_info->p_next = NULL;
 159
 160     msg_Info( p_input, "playlist item `%s'", p_input->psz_source );
 161
 162     p_info = input_InfoCategory( p_input, "General" );
 163     input_AddInfo( p_info, "playlist item", p_input->psz_source );
 164     vlc_object_attach( p_input, p_parent );
 165
 166     /* Create thread and wait for its readiness. */
 167     if( vlc_thread_create( p_input, "input", RunThread,
 168                            VLC_THREAD_PRIORITY_INPUT, VLC_TRUE ) )
 169     {
 170         msg_Err( p_input, "cannot create input thread" );
 171         free( p_input );
 172         return NULL;
 173     }
 174
 175     return p_input;
 176 }
 177
 178 /*****************************************************************************
 179  * input_StopThread: mark an input thread as zombie
 180  *****************************************************************************
 181  * This function should not return until the thread is effectively cancelled.
 182  *****************************************************************************/
 183 void input_StopThread( input_thread_t *p_input )
 184 {
 185     /* Make the thread exit from a possible vlc_cond_wait() */
 186     vlc_mutex_lock( &p_input->stream.stream_lock );
 187     /* Request thread destruction */
 188     p_input->b_die = 1;
 189
 190     vlc_cond_signal( &p_input->stream.stream_wait );
 191     vlc_mutex_unlock( &p_input->stream.stream_lock );
 192 }
 193
 194 /*****************************************************************************
 195  * input_DestroyThread: mark an input thread as zombie
 196  *****************************************************************************
 197  * This function should not return until the thread is effectively cancelled.
 198  *****************************************************************************/
 199 void input_DestroyThread( input_thread_t *p_input )
 200 {
 201     /* Join the thread */
 202     vlc_thread_join( p_input );
 203
 204     /* Destroy Mutex locks */
 205     vlc_mutex_destroy( &p_input->stream.control.control_lock );
 206     vlc_cond_destroy( &p_input->stream.stream_wait );
 207     vlc_mutex_destroy( &p_input->stream.stream_lock );
 208 }
 209
 210 /*****************************************************************************
 211  * RunThread: main thread loop
 212  *****************************************************************************
 213  * Thread in charge of processing the network packets and demultiplexing.
 214  *****************************************************************************/
 215 static int RunThread( input_thread_t *p_input )
 216 {
 217     /* Signal right now, otherwise we'll get stuck in a peek */
 218     vlc_thread_ready( p_input );
 219
 220     if( InitThread( p_input ) )
 221     {
 222         /* If we failed, wait before we are killed, and exit */
 223         p_input->b_error = 1;
 224         ErrorThread( p_input );
 225         p_input->b_dead = 1;
 226         return 0;
 227     }
 228
 229     /* initialization is complete */
 230     vlc_mutex_lock( &p_input->stream.stream_lock );
 231     p_input->stream.b_changed = 1;
 232     vlc_mutex_unlock( &p_input->stream.stream_lock );
 233
 234     while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
 235     {
 236         int i, i_count;
 237
 238         p_input->c_loops++;
 239
 240         vlc_mutex_lock( &p_input->stream.stream_lock );
 241
 242         if( p_input->stream.p_new_program )
 243         {
 244             if( p_input->pf_set_program != NULL )
 245             {
 246
 247                 /* Reinitialize buffer manager. */
 248                 input_AccessReinit( p_input );
 249
 250                 p_input->pf_set_program( p_input,
 251                                          p_input->stream.p_new_program );
 252
 253                 /* Escape all decoders for the stream discontinuity they
 254                  * will encounter. */
 255                 input_EscapeDiscontinuity( p_input );
 256
 257                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 258                 {
 259                     pgrm_descriptor_t * p_pgrm
 260                                             = p_input->stream.pp_programs[i];
 261
 262                     /* Reinitialize synchro. */
 263                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 264                 }
 265             }
 266             p_input->stream.p_new_program = NULL;
 267         }
 268
 269         if( p_input->stream.p_new_area )
 270         {
 271             if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
 272             {
 273                 input_AccessReinit( p_input );
 274
 275                 p_input->pf_set_area( p_input, p_input->stream.p_new_area );
 276
 277                 /* Escape all decoders for the stream discontinuity they
 278                  * will encounter. */
 279                 input_EscapeDiscontinuity( p_input );
 280
 281                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 282                 {
 283                     pgrm_descriptor_t * p_pgrm
 284                                             = p_input->stream.pp_programs[i];
 285
 286                     /* Reinitialize synchro. */
 287                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 288                 }
 289             }
 290             p_input->stream.p_new_area = NULL;
 291         }
 292
 293         if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
 294         {
 295             if( p_input->stream.b_seekable
 296                  && p_input->pf_seek != NULL )
 297             {
 298                 off_t i_new_pos;
 299
 300                 /* Reinitialize buffer manager. */
 301                 input_AccessReinit( p_input );
 302
 303                 i_new_pos = p_input->stream.p_selected_area->i_seek;
 304                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 305                 p_input->pf_seek( p_input, i_new_pos );
 306                 vlc_mutex_lock( &p_input->stream.stream_lock );
 307
 308                 /* Escape all decoders for the stream discontinuity they
 309                  * will encounter. */
 310                 input_EscapeDiscontinuity( p_input );
 311
 312                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 313                 {
 314                     pgrm_descriptor_t * p_pgrm
 315                                             = p_input->stream.pp_programs[i];
 316
 317                     /* Reinitialize synchro. */
 318                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 319                 }
 320             }
 321             p_input->stream.p_selected_area->i_seek = NO_SEEK;
 322         }
 323
 324         if( p_input->stream.p_removed_es )
 325         {
 326             input_UnselectES( p_input, p_input->stream.p_removed_es );
 327             p_input->stream.p_removed_es = NULL;
 328         }
 329
 330         if( p_input->stream.p_newly_selected_es )
 331         {
 332             input_SelectES( p_input, p_input->stream.p_newly_selected_es );
 333             p_input->stream.p_newly_selected_es = NULL;
 334         }
 335
 336         if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
 337         {
 338             if( p_input->stream.b_new_mute )
 339             {
 340                 input_EscapeAudioDiscontinuity( p_input );
 341             }
 342
 343             vlc_mutex_lock( &p_input->stream.control.control_lock );
 344             p_input->stream.control.b_mute = p_input->stream.b_new_mute;
 345             vlc_mutex_unlock( &p_input->stream.control.control_lock );
 346
 347             p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 348         }
 349
 350         vlc_mutex_unlock( &p_input->stream.stream_lock );
 351
 352         /* Read and demultiplex some data. */
 353         i_count = p_input->pf_demux( p_input );
 354
 355         if( i_count == 0 && p_input->stream.b_seekable )
 356         {
 357             /* End of file - we do not set b_die because only the
 358              * playlist is allowed to do so. */
 359             msg_Info( p_input, "EOF reached" );
 360             p_input->b_eof = 1;
 361         }
 362         else if( i_count < 0 )
 363         {
 364             p_input->b_error = 1;
 365         }
 366     }
 367
 368     if( p_input->b_error || p_input->b_eof )
 369     {
 370         ErrorThread( p_input );
 371     }
 372
 373     EndThread( p_input );
 374
 375     return 0;
 376 }
 377
 378 /*****************************************************************************
 379  * InitThread: init the input Thread
 380  *****************************************************************************/
 381 static int InitThread( input_thread_t * p_input )
 382 {
 383     /* Parse source string. Syntax : [[<access>][/<demux>]:][<source>] */
 384     char * psz_parser = p_input->psz_source;
 385
 386     /* Skip the plug-in names */
 387     while( *psz_parser && *psz_parser != ':' )
 388     {
 389         psz_parser++;
 390     }
 391 #ifdef WIN32
 392     if( psz_parser - p_input->psz_source == 1 )
 393     {
 394         msg_Warn( p_input, "drive letter %c: found in source string",
 395                            p_input->psz_source ) ;
 396         psz_parser = "";
 397     }
 398 #endif
 399
 400     if( !*psz_parser )
 401     {
 402         p_input->psz_access = p_input->psz_demux = "";
 403         p_input->psz_name = p_input->psz_source;
 404     }
 405     else
 406     {
 407         *psz_parser++ = '\0';
 408
 409         /* let's skip '//' */
 410         if( psz_parser[0] == '/' && psz_parser[1] == '/' )
 411         {
 412             psz_parser += 2 ;
 413         }
 414
 415         p_input->psz_name = psz_parser ;
 416
 417         /* Come back to parse the access and demux plug-ins */
 418         psz_parser = p_input->psz_source;
 419
 420         if( !*psz_parser )
 421         {
 422             /* No access */
 423             p_input->psz_access = "";
 424         }
 425         else if( *psz_parser == '/' )
 426         {
 427             /* No access */
 428             p_input->psz_access = "";
 429             psz_parser++;
 430         }
 431         else
 432         {
 433             p_input->psz_access = psz_parser;
 434
 435             while( *psz_parser && *psz_parser != '/' )
 436             {
 437                 psz_parser++;
 438             }
 439
 440             if( *psz_parser == '/' )
 441             {
 442                 *psz_parser++ = '\0';
 443             }
 444         }
 445
 446         if( !*psz_parser )
 447         {
 448             /* No demux */
 449             p_input->psz_demux = "";
 450         }
 451         else
 452         {
 453             p_input->psz_demux = psz_parser;
 454         }
 455     }
 456
 457     msg_Dbg( p_input, "access `%s', demux `%s', name `%s'",
 458              p_input->psz_access, p_input->psz_demux, p_input->psz_name );
 459
 460     if( input_AccessInit( p_input ) == -1 )
 461     {
 462         return -1;
 463     }
 464
 465     /* Find and open appropriate access module */
 466     p_input->p_access = module_Need( p_input, "access",
 467                                      p_input->psz_access );
 468
 469     if( p_input->p_access == NULL )
 470     {
 471         msg_Err( p_input, "no suitable access module for `%s/%s://%s'",
 472                  p_input->psz_access, p_input->psz_demux, p_input->psz_name );
 473         return -1;
 474     }
 475
 476     /* Waiting for stream. */
 477     if( p_input->i_mtu )
 478     {
 479         p_input->i_bufsize = p_input->i_mtu;
 480     }
 481     else
 482     {
 483         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
 484     }
 485
 486     if( p_input->p_current_data == NULL && p_input->pf_read != NULL )
 487     {
 488         while( !input_FillBuffer( p_input ) )
 489         {
 490             if( p_input->b_die || p_input->b_error || p_input->b_eof )
 491             {
 492                 module_Unneed( p_input, p_input->p_access );
 493                 return -1;
 494             }
 495         }
 496     }
 497
 498     /* Find and open appropriate demux module */
 499     p_input->p_demux = module_Need( p_input, "demux",
 500                                     p_input->psz_demux );
 501
 502     if( p_input->p_demux== NULL )
 503     {
 504         msg_Err( p_input, "no suitable demux module for `%s/%s://%s'",
 505                  p_input->psz_access, p_input->psz_demux, p_input->psz_name );
 506         module_Unneed( p_input, p_input->p_access );
 507         return -1;
 508     }
 509
 510     /* Initialize optional stream output. */
 511     psz_parser = config_GetPsz( p_input, "sout" );
 512     if ( psz_parser != NULL )
 513     {
 514         if ( *psz_parser &&
 515              (p_input->stream.p_sout = sout_NewInstance( p_input, psz_parser ))
 516                == NULL )
 517         {
 518             msg_Err( p_input, "cannot start stream output instance, aborting" );
 519             free( psz_parser );
 520             module_Unneed( p_input, p_input->p_access );
 521             module_Unneed( p_input, p_input->p_demux );
 522             return -1;
 523         }
 524
 525         free( psz_parser );
 526     }
 527
 528     return 0;
 529 }
 530
 531 /*****************************************************************************
 532  * ErrorThread: RunThread() error loop
 533  *****************************************************************************
 534  * This function is called when an error occured during thread main's loop.
 535  *****************************************************************************/
 536 static void ErrorThread( input_thread_t *p_input )
 537 {
 538     while( !p_input->b_die )
 539     {
 540         /* Sleep a while */
 541         msleep( INPUT_IDLE_SLEEP );
 542     }
 543 }
 544
 545 /*****************************************************************************
 546  * EndThread: end the input thread
 547  *****************************************************************************/
 548 static void EndThread( input_thread_t * p_input )
 549 {
 550 #ifdef HAVE_SYS_TIMES_H
 551     /* Display statistics */
 552     struct tms  cpu_usage;
 553     times( &cpu_usage );
 554
 555     msg_Dbg( p_input, "%d loops consuming user: %d, system: %d",
 556              p_input->c_loops, cpu_usage.tms_utime, cpu_usage.tms_stime );
 557 #else
 558     msg_Dbg( p_input, "%d loops", p_input->c_loops );
 559 #endif
 560
 561     /* Free info structures */
 562     msg_Dbg( p_input, "freeing info structures...");
 563     input_DelInfo( p_input );
 564
 565     input_DumpStream( p_input );
 566
 567     /* Free all ES and destroy all decoder threads */
 568     input_EndStream( p_input );
 569
 570     /* Close optional stream output instance */
 571     if ( p_input->stream.p_sout != NULL )
 572     {
 573         sout_DeleteInstance( p_input->stream.p_sout );
 574     }
 575
 576     /* Free demultiplexer's data */
 577     module_Unneed( p_input, p_input->p_demux );
 578
 579     /* Close the access plug-in */
 580     module_Unneed( p_input, p_input->p_access );
 581
 582     input_AccessEnd( p_input );
 583
 584     free( p_input->psz_source );
 585
 586     /* Tell we're dead */
 587     p_input->b_dead = 1;
 588 }
 589