git.sesse.net Git - vlc/blob - src/video_output/video_output.c

   1 /*****************************************************************************
   2  * video_output.c : video output thread
   3  * This module describes the programming interface for video output threads.
   4  * It includes functions allowing to open a new thread, send pictures to a
   5  * thread, and destroy a previously oppened video output thread.
   6  *****************************************************************************
   7  * Copyright (C) 2000-2001 VideoLAN
   8  * $Id: video_output.c,v 1.161 2002/02/24 20:51:10 gbazin Exp $
   9  *
  10  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  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 <errno.h>                                                 /* ENOMEM */
  31 #include <stdlib.h>                                                /* free() */
  32 #include <stdio.h>                                              /* sprintf() */
  33 #include <string.h>                                            /* strerror() */
  34
  35 #include <videolan/vlc.h>
  36
  37 #ifdef HAVE_SYS_TIMES_H
  38 #   include <sys/times.h>
  39 #endif
  40
  41 #include "video.h"
  42 #include "video_output.h"
  43
  44 /*****************************************************************************
  45  * Local prototypes
  46  *****************************************************************************/
  47 static int      InitThread        ( vout_thread_t *p_vout );
  48 static void     RunThread         ( vout_thread_t *p_vout );
  49 static void     ErrorThread       ( vout_thread_t *p_vout );
  50 static void     EndThread         ( vout_thread_t *p_vout );
  51 static void     DestroyThread     ( vout_thread_t *p_vout, int i_status );
  52 static int      ReduceHeight      ( int );
  53
  54 /*****************************************************************************
  55  * vout_InitBank: initialize the video output bank.
  56  *****************************************************************************/
  57 void vout_InitBank ( void )
  58 {
  59     p_vout_bank->i_count = 0;
  60
  61     vlc_mutex_init( &p_vout_bank->lock );
  62 }
  63
  64 /*****************************************************************************
  65  * vout_EndBank: empty the video output bank.
  66  *****************************************************************************
  67  * This function ends all unused video outputs and empties the bank in
  68  * case of success.
  69  *****************************************************************************/
  70 void vout_EndBank ( void )
  71 {
  72     /* Ask all remaining video outputs to die */
  73     while( p_vout_bank->i_count )
  74     {
  75         vout_DestroyThread(
  76                 p_vout_bank->pp_vout[ --p_vout_bank->i_count ], NULL );
  77     }
  78
  79     vlc_mutex_destroy( &p_vout_bank->lock );
  80 }
  81
  82 /*****************************************************************************
  83  * vout_CreateThread: creates a new video output thread
  84  *****************************************************************************
  85  * This function creates a new video output thread, and returns a pointer
  86  * to its description. On error, it returns NULL.
  87  * If pi_status is NULL, then the function will block until the thread is ready.
  88  * If not, it will be updated using one of the THREAD_* constants.
  89  *****************************************************************************/
  90 vout_thread_t * vout_CreateThread   ( int *pi_status,
  91                                       int i_width, int i_height,
  92                                       u32 i_chroma, int i_aspect )
  93 {
  94     vout_thread_t * p_vout;                             /* thread descriptor */
  95     int             i_status;                               /* thread status */
  96     int             i_index;                                /* loop variable */
  97     char          * psz_plugin;
  98
  99     /* Allocate descriptor */
 100     p_vout = (vout_thread_t *) malloc( sizeof(vout_thread_t) );
 101     if( p_vout == NULL )
 102     {
 103         intf_ErrMsg( "vout error: vout thread creation returned %s",
 104                      strerror(ENOMEM) );
 105         return( NULL );
 106     }
 107
 108     /* Choose the best module */
 109     if( !(psz_plugin = config_GetPszVariable( VOUT_FILTER_VAR )) )
 110     {
 111         psz_plugin = config_GetPszVariable( VOUT_METHOD_VAR );
 112     }
 113
 114     /* Initialize thread properties - thread id and locks will be initialized
 115      * later */
 116     p_vout->b_die               = 0;
 117     p_vout->b_error             = 0;
 118     p_vout->b_active            = 0;
 119     p_vout->pi_status           = (pi_status != NULL) ? pi_status : &i_status;
 120     *p_vout->pi_status          = THREAD_CREATE;
 121
 122     /* Initialize pictures and subpictures - translation tables and functions
 123      * will be initialized later in InitThread */
 124     for( i_index = 0; i_index < VOUT_MAX_PICTURES; i_index++)
 125     {
 126         p_vout->p_picture[i_index].i_status = FREE_PICTURE;
 127         p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
 128     }
 129
 130     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++)
 131     {
 132         p_vout->p_subpicture[i_index].i_status = FREE_SUBPICTURE;
 133         p_vout->p_subpicture[i_index].i_type   = EMPTY_SUBPICTURE;
 134     }
 135
 136     /* Initialize the rendering heap */
 137     p_vout->i_heap_size = 0;
 138
 139     I_RENDERPICTURES = 0;
 140     p_vout->render.i_width    = i_width;
 141     p_vout->render.i_height   = i_height;
 142     p_vout->render.i_chroma   = i_chroma;
 143     p_vout->render.i_aspect   = i_aspect;
 144
 145     /* Initialize misc stuff */
 146     p_vout->i_changes    = 0;
 147     p_vout->f_gamma      = 0;
 148     p_vout->b_grayscale  = 0;
 149     p_vout->b_info       = 0;
 150     p_vout->b_interface  = 0;
 151     p_vout->b_scale      = 1;
 152     p_vout->b_fullscreen = 0;
 153     p_vout->render_time  = 10;
 154
 155     /* user requested fullscreen? */
 156     if( config_GetIntVariable( VOUT_FULLSCREEN_VAR ) )
 157         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 158
 159     p_vout->p_module
 160         = module_Need( MODULE_CAPABILITY_VOUT, psz_plugin, (void *)p_vout );
 161
 162     if( psz_plugin ) free( psz_plugin );
 163     if( p_vout->p_module == NULL )
 164     {
 165         intf_ErrMsg( "vout error: no suitable vout module" );
 166         free( p_vout );
 167         return( NULL );
 168     }
 169
 170 #define f p_vout->p_module->p_functions->vout.functions.vout
 171     p_vout->pf_create     = f.pf_create;
 172     p_vout->pf_init       = f.pf_init;
 173     p_vout->pf_end        = f.pf_end;
 174     p_vout->pf_destroy    = f.pf_destroy;
 175     p_vout->pf_manage     = f.pf_manage;
 176     p_vout->pf_render     = f.pf_render;
 177     p_vout->pf_display    = f.pf_display;
 178 #undef f
 179
 180     /* Create thread and set locks */
 181     vlc_mutex_init( &p_vout->picture_lock );
 182     vlc_mutex_init( &p_vout->subpicture_lock );
 183     vlc_mutex_init( &p_vout->change_lock );
 184
 185     if( vlc_thread_create( &p_vout->thread_id, "video output",
 186                            (void *) RunThread, (void *) p_vout) )
 187     {
 188         intf_ErrMsg("vout error: %s", strerror(ENOMEM));
 189         p_vout->pf_destroy( p_vout );
 190         module_Unneed( p_vout->p_module );
 191         free( p_vout );
 192         return( NULL );
 193     }
 194
 195     /* If status is NULL, wait until the thread is created */
 196     if( pi_status == NULL )
 197     {
 198         do
 199         {
 200             msleep( THREAD_SLEEP );
 201         }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
 202                 && (i_status != THREAD_FATAL) );
 203         if( i_status != THREAD_READY )
 204         {
 205             return( NULL );
 206         }
 207     }
 208
 209     return( p_vout );
 210 }
 211
 212 /*****************************************************************************
 213  * vout_DestroyThread: destroys a previously created thread
 214  *****************************************************************************
 215  * Destroy a terminated thread.
 216  * The function will request a destruction of the specified thread. If pi_error
 217  * is NULL, it will return once the thread is destroyed. Else, it will be
 218  * update using one of the THREAD_* constants.
 219  *****************************************************************************/
 220 void vout_DestroyThread( vout_thread_t *p_vout, int *pi_status )
 221 {
 222     int     i_status;                                       /* thread status */
 223
 224     /* Set status */
 225     p_vout->pi_status = (pi_status != NULL) ? pi_status : &i_status;
 226     *p_vout->pi_status = THREAD_DESTROY;
 227
 228     /* Request thread destruction */
 229     p_vout->b_die = 1;
 230
 231     /* If status is NULL, wait until thread has been destroyed */
 232     if( pi_status == NULL )
 233     {
 234         do
 235         {
 236             msleep( THREAD_SLEEP );
 237         } while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
 238                  && (i_status != THREAD_FATAL) );
 239     }
 240 }
 241
 242 /*****************************************************************************
 243  * InitThread: initialize video output thread
 244  *****************************************************************************
 245  * This function is called from RunThread and performs the second step of the
 246  * initialization. It returns 0 on success. Note that the thread's flag are not
 247  * modified inside this function.
 248  *****************************************************************************/
 249 static int InitThread( vout_thread_t *p_vout )
 250 {
 251     int i, i_pgcd;
 252
 253     /* Update status */
 254     *p_vout->pi_status = THREAD_START;
 255
 256     vlc_mutex_lock( &p_vout->change_lock );
 257
 258 #ifdef STATS
 259     p_vout->c_loops = 0;
 260 #endif
 261
 262     /* Initialize output method, it issues its own error messages */
 263     if( p_vout->pf_init( p_vout ) )
 264     {
 265         vlc_mutex_unlock( &p_vout->change_lock );
 266         return( 1 );
 267     }
 268
 269     if( !I_OUTPUTPICTURES )
 270     {
 271         intf_ErrMsg( "vout error: plugin was unable to allocate at least "
 272                      "one direct buffer" );
 273         p_vout->pf_end( p_vout );
 274         vlc_mutex_unlock( &p_vout->change_lock );
 275         return( 1 );
 276     }
 277
 278     intf_WarnMsg( 1, "vout info: got %i direct buffer(s)", I_OUTPUTPICTURES );
 279
 280     i_pgcd = ReduceHeight( p_vout->render.i_aspect );
 281     intf_WarnMsg( 1, "vout info: picture in %ix%i, chroma 0x%.8x (%4.4s), "
 282                      "aspect ratio %i:%i",
 283                   p_vout->render.i_width, p_vout->render.i_height,
 284                   p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 285                   p_vout->render.i_aspect / i_pgcd,
 286                   VOUT_ASPECT_FACTOR / i_pgcd );
 287
 288     i_pgcd = ReduceHeight( p_vout->output.i_aspect );
 289     intf_WarnMsg( 1, "vout info: picture out %ix%i, chroma 0x%.8x (%4.4s), "
 290                      "aspect ratio %i:%i",
 291                   p_vout->output.i_width, p_vout->output.i_height,
 292                   p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 293                   p_vout->output.i_aspect / i_pgcd,
 294                   VOUT_ASPECT_FACTOR / i_pgcd );
 295
 296     /* Check whether we managed to create direct buffers similar to
 297      * the render buffers, ie same size, chroma and aspect ratio */
 298     if( ( p_vout->output.i_width == p_vout->render.i_width )
 299      && ( p_vout->output.i_height == p_vout->render.i_height )
 300      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) )
 301      && ( p_vout->output.i_aspect == p_vout->render.i_aspect ) )
 302     {
 303         /* Cool ! We have direct buffers, we can ask the decoder to
 304          * directly decode into them ! Map the first render buffers to
 305          * the first direct buffers, but keep the first direct buffer
 306          * for memcpy operations */
 307         p_vout->b_direct = 1;
 308
 309         intf_WarnMsg( 2, "vout info: direct render, mapping "
 310                          "render pictures 0-%i to system pictures 1-%i",
 311                          VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 312
 313         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 314         {
 315             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 316             I_RENDERPICTURES++;
 317         }
 318
 319     }
 320     else
 321     {
 322         /* Rats... Something is wrong here, we could not find an output
 323          * plugin able to directly render what we decode. See if we can
 324          * find a chroma plugin to do the conversion */
 325         p_vout->b_direct = 0;
 326
 327         /* Choose the best module */
 328         p_vout->chroma.p_module
 329             = module_Need( MODULE_CAPABILITY_CHROMA, NULL, (void *)p_vout );
 330
 331         if( p_vout->chroma.p_module == NULL )
 332         {
 333             intf_ErrMsg( "vout error: no chroma module for %4.4s to %4.4s",
 334                          &p_vout->render.i_chroma, &p_vout->output.i_chroma );
 335             p_vout->pf_end( p_vout );
 336             vlc_mutex_unlock( &p_vout->change_lock );
 337             return( 1 );
 338         }
 339
 340 #define f p_vout->chroma.p_module->p_functions->chroma.functions.chroma
 341         p_vout->chroma.pf_init       = f.pf_init;
 342         p_vout->chroma.pf_end        = f.pf_end;
 343 #undef f
 344
 345         if( p_vout->chroma.pf_init( p_vout ) )
 346         {
 347             intf_ErrMsg( "vout error: could not initialize chroma module" );
 348             module_Unneed( p_vout->chroma.p_module );
 349             p_vout->pf_end( p_vout );
 350             vlc_mutex_unlock( &p_vout->change_lock );
 351             return( 1 );
 352         }
 353
 354         if( I_OUTPUTPICTURES < VOUT_MAX_PICTURES )
 355         {
 356             intf_WarnMsg( 2, "vout info: indirect render, mapping "
 357                              "render pictures %i-%i to system pictures %i-%i",
 358                              I_OUTPUTPICTURES - 1, VOUT_MAX_PICTURES - 2,
 359                              I_OUTPUTPICTURES, VOUT_MAX_PICTURES - 1 );
 360         }
 361         else
 362         {
 363             intf_WarnMsg( 2, "vout info: indirect render, no system "
 364                              "pictures needed, we have %i directbuffers",
 365                              I_OUTPUTPICTURES );
 366         }
 367
 368         /* Append render buffers after the direct buffers */
 369         for( i = I_OUTPUTPICTURES; i < VOUT_MAX_PICTURES; i++ )
 370         {
 371             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 372             I_RENDERPICTURES++;
 373         }
 374     }
 375
 376     /* Mark thread as running and return */
 377     p_vout->b_active = 1;
 378     *p_vout->pi_status = THREAD_READY;
 379
 380     return( 0 );
 381 }
 382
 383 /*****************************************************************************
 384  * RunThread: video output thread
 385  *****************************************************************************
 386  * Video output thread. This function does only returns when the thread is
 387  * terminated. It handles the pictures arriving in the video heap and the
 388  * display device events.
 389  *****************************************************************************/
 390 static void RunThread( vout_thread_t *p_vout)
 391 {
 392     int             i_index;                                /* index in heap */
 393     mtime_t         current_date;                            /* current date */
 394     mtime_t         display_date;                            /* display date */
 395
 396     picture_t *     p_picture;                            /* picture pointer */
 397     picture_t *     p_directbuffer;              /* direct buffer to display */
 398
 399     subpicture_t *  p_subpic;                          /* subpicture pointer */
 400
 401     /*
 402      * Initialize thread
 403      */
 404     p_vout->b_error = InitThread( p_vout );
 405     if( p_vout->b_error )
 406     {
 407         /* Destroy thread structures allocated by Create and InitThread */
 408         p_vout->pf_destroy( p_vout );
 409
 410         DestroyThread( p_vout, THREAD_ERROR );
 411         return;
 412     }
 413
 414     /*
 415      * Main loop - it is not executed if an error occured during
 416      * initialization
 417      */
 418     while( (!p_vout->b_die) && (!p_vout->b_error) )
 419     {
 420         /* Initialize loop variables */
 421         display_date = 0;
 422         current_date = mdate();
 423
 424 #ifdef STATS
 425         p_vout->c_loops++;
 426         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 427         {
 428             intf_Msg( "vout stats: picture heap: %d/%d",
 429                       I_RENDERPICTURES, p_vout->i_heap_size );
 430         }
 431 #endif
 432
 433         /*
 434          * Find the picture to display - this operation does not need lock,
 435          * since only READY_PICTUREs are handled
 436          */
 437         p_picture = NULL;
 438
 439         for( i_index = 0;
 440              i_index < I_RENDERPICTURES;
 441              i_index++ )
 442         {
 443             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 444                 && ( (p_picture == NULL) ||
 445                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 446             {
 447                 p_picture = PP_RENDERPICTURE[i_index];
 448                 display_date = p_picture->date;
 449             }
 450         }
 451
 452         if( p_picture != NULL )
 453         {
 454             /* Compute FPS rate */
 455             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 456                 = display_date;
 457
 458             if( display_date < current_date + p_vout->render_time )
 459             {
 460                 /* Picture is late: it will be destroyed and the thread
 461                  * will directly choose the next picture */
 462                 vlc_mutex_lock( &p_vout->picture_lock );
 463                 if( p_picture->i_refcount )
 464                 {
 465                     /* Pretend we displayed the picture, but don't destroy
 466                      * it since the decoder might still need it. */
 467                     p_picture->i_status = DISPLAYED_PICTURE;
 468                 }
 469                 else
 470                 {
 471                     /* Destroy the picture without displaying it */
 472                     p_picture->i_status = DESTROYED_PICTURE;
 473                     p_vout->i_heap_size--;
 474                 }
 475                 intf_WarnMsg( 1, "vout warning: late picture skipped (%p)",
 476                               p_picture );
 477                 vlc_mutex_unlock( &p_vout->picture_lock );
 478
 479                 continue;
 480             }
 481             else if( display_date > current_date + VOUT_DISPLAY_DELAY )
 482             {
 483                 /* A picture is ready to be rendered, but its rendering date
 484                  * is far from the current one so the thread will perform an
 485                  * empty loop as if no picture were found. The picture state
 486                  * is unchanged */
 487                 p_picture    = NULL;
 488                 display_date = 0;
 489             }
 490         }
 491
 492         /*
 493          * Check for subpictures to display
 494          */
 495         p_subpic = vout_SortSubPictures( p_vout, display_date );
 496
 497         /*
 498          * Perform rendering
 499          */
 500         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 501
 502         /*
 503          * Call the plugin-specific rendering method
 504          */
 505         if( p_picture != NULL )
 506         {
 507             /* Render the direct buffer returned by vout_RenderPicture */
 508             p_vout->pf_render( p_vout, p_directbuffer );
 509         }
 510
 511         /*
 512          * Sleep, wake up
 513          */
 514         if( display_date != 0 )
 515         {
 516             /* Store render time using Bresenham algorithm */
 517             p_vout->render_time += mdate() - current_date;
 518             p_vout->render_time >>= 1;
 519         }
 520
 521         /* Give back change lock */
 522         vlc_mutex_unlock( &p_vout->change_lock );
 523
 524         /* Sleep a while or until a given date */
 525         if( display_date != 0 )
 526         {
 527             mwait( display_date - VOUT_MWAIT_TOLERANCE );
 528         }
 529         else
 530         {
 531             msleep( VOUT_IDLE_SLEEP );
 532         }
 533
 534         /* On awakening, take back lock and send immediately picture
 535          * to display. */
 536         vlc_mutex_lock( &p_vout->change_lock );
 537
 538         /*
 539          * Display the previously rendered picture
 540          */
 541         if( p_picture != NULL )
 542         {
 543             /* Display the direct buffer returned by vout_RenderPicture */
 544             p_vout->pf_display( p_vout, p_directbuffer );
 545
 546             /* Remove picture from heap */
 547             vlc_mutex_lock( &p_vout->picture_lock );
 548             if( p_picture->i_refcount )
 549             {
 550                 p_picture->i_status = DISPLAYED_PICTURE;
 551             }
 552             else
 553             {
 554                 p_picture->i_status = DESTROYED_PICTURE;
 555                 p_vout->i_heap_size--;
 556             }
 557             vlc_mutex_unlock( &p_vout->picture_lock );
 558         }
 559
 560         /*
 561          * Check events and manage thread
 562          */
 563         if( p_vout->pf_manage( p_vout ) )
 564         {
 565             /* A fatal error occured, and the thread must terminate immediately,
 566              * without displaying anything - setting b_error to 1 causes the
 567              * immediate end of the main while() loop. */
 568             p_vout->b_error = 1;
 569         }
 570     }
 571
 572     /*
 573      * Error loop - wait until the thread destruction is requested
 574      */
 575     if( p_vout->b_error )
 576     {
 577         ErrorThread( p_vout );
 578     }
 579
 580     /* End of thread */
 581     EndThread( p_vout );
 582
 583     /* Destroy method-dependant resources */
 584     p_vout->pf_destroy( p_vout );
 585
 586     /* Destroy thread structures allocated by CreateThread */
 587     DestroyThread( p_vout, THREAD_OVER );
 588 }
 589
 590 /*****************************************************************************
 591  * ErrorThread: RunThread() error loop
 592  *****************************************************************************
 593  * This function is called when an error occured during thread main's loop. The
 594  * thread can still receive feed, but must be ready to terminate as soon as
 595  * possible.
 596  *****************************************************************************/
 597 static void ErrorThread( vout_thread_t *p_vout )
 598 {
 599     /* Wait until a `die' order */
 600     while( !p_vout->b_die )
 601     {
 602         /* Sleep a while */
 603         msleep( VOUT_IDLE_SLEEP );
 604     }
 605 }
 606
 607 /*****************************************************************************
 608  * EndThread: thread destruction
 609  *****************************************************************************
 610  * This function is called when the thread ends after a sucessful
 611  * initialization. It frees all ressources allocated by InitThread.
 612  *****************************************************************************/
 613 static void EndThread( vout_thread_t *p_vout )
 614 {
 615     int     i_index;                                        /* index in heap */
 616
 617     /* Store status */
 618     *p_vout->pi_status = THREAD_END;
 619
 620 #ifdef STATS
 621     {
 622         struct tms cpu_usage;
 623         times( &cpu_usage );
 624
 625         intf_Msg( "vout stats: cpu usage (user: %d, system: %d)",
 626                   cpu_usage.tms_utime, cpu_usage.tms_stime );
 627     }
 628 #endif
 629
 630     if( !p_vout->b_direct )
 631     {
 632         p_vout->chroma.pf_end( p_vout );
 633         module_Unneed( p_vout->chroma.p_module );
 634     }
 635
 636     /* Destroy all remaining pictures */
 637     for( i_index = 0; i_index < VOUT_MAX_PICTURES; i_index++ )
 638     {
 639         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
 640         {
 641             free( p_vout->p_picture[i_index].p_data );
 642         }
 643     }
 644
 645     /* Destroy all remaining subpictures */
 646     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
 647     {
 648         if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
 649         {
 650             free( p_vout->p_subpicture[i_index].p_data );
 651         }
 652     }
 653
 654     /* Destroy translation tables */
 655     p_vout->pf_end( p_vout );
 656
 657     /* Release the change lock */
 658     vlc_mutex_unlock( &p_vout->change_lock );
 659 }
 660
 661 /*****************************************************************************
 662  * DestroyThread: thread destruction
 663  *****************************************************************************
 664  * This function is called when the thread ends. It frees all ressources
 665  * allocated by CreateThread. Status is available at this stage.
 666  *****************************************************************************/
 667 static void DestroyThread( vout_thread_t *p_vout, int i_status )
 668 {
 669     int *pi_status;                                         /* status adress */
 670
 671     /* Store status adress */
 672     pi_status = p_vout->pi_status;
 673
 674     /* Destroy the locks */
 675     vlc_mutex_destroy( &p_vout->picture_lock );
 676     vlc_mutex_destroy( &p_vout->subpicture_lock );
 677     vlc_mutex_destroy( &p_vout->change_lock );
 678
 679     /* Release the module */
 680     module_Unneed( p_vout->p_module );
 681
 682     /* Free structure */
 683     free( p_vout );
 684     *pi_status = i_status;
 685 }
 686
 687 static int ReduceHeight( int i_ratio )
 688 {
 689     int i_dummy = VOUT_ASPECT_FACTOR;
 690     int i_pgcd  = 1;
 691
 692     if( !i_ratio )
 693     {
 694         return i_pgcd;
 695     }
 696
 697     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
 698     while( !(i_ratio & 1) && !(i_dummy & 1) )
 699     {
 700         i_ratio >>= 1;
 701         i_dummy >>= 1;
 702         i_pgcd  <<= 1;
 703     }
 704
 705     while( !(i_ratio % 3) && !(i_dummy % 3) )
 706     {
 707         i_ratio /= 3;
 708         i_dummy /= 3;
 709         i_pgcd  *= 3;
 710     }
 711
 712     while( !(i_ratio % 5) && !(i_dummy % 5) )
 713     {
 714         i_ratio /= 5;
 715         i_dummy /= 5;
 716         i_pgcd  *= 5;
 717     }
 718
 719     return i_pgcd;
 720 }
 721