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 1.186 2002/07/02 22:07:02 jlj 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 <vlc/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 #if defined( SYS_DARWIN )
  45 #include "darwin_specific.h"
  46 #endif
  47
  48 /*****************************************************************************
  49  * Local prototypes
  50  *****************************************************************************/
  51 static int      InitThread        ( vout_thread_t * );
  52 static void     RunThread         ( vout_thread_t * );
  53 static void     ErrorThread       ( vout_thread_t * );
  54 static void     EndThread         ( vout_thread_t * );
  55 static void     DestroyThread     ( vout_thread_t * );
  56
  57 static int      ReduceHeight      ( int );
  58 static int      BinaryLog         ( u32 );
  59 static void     MaskToShift       ( int *, int *, u32 );
  60 static void     InitWindowSize    ( vout_thread_t *, int *, int * );
  61
  62 /*****************************************************************************
  63  * vout_CreateThread: creates a new video output thread
  64  *****************************************************************************
  65  * This function creates a new video output thread, and returns a pointer
  66  * to its description. On error, it returns NULL.
  67  *****************************************************************************/
  68 vout_thread_t * __vout_CreateThread ( vlc_object_t *p_parent,
  69                                       int i_width, int i_height,
  70                                       u32 i_chroma, int i_aspect )
  71 {
  72     vout_thread_t * p_vout;                             /* thread descriptor */
  73     int             i_index;                                /* loop variable */
  74     char          * psz_plugin;
  75
  76     /* Allocate descriptor */
  77     p_vout = vlc_object_create( p_parent, VLC_OBJECT_VOUT );
  78     if( p_vout == NULL )
  79     {
  80         msg_Err( p_parent, "out of memory" );
  81         return( NULL );
  82     }
  83
  84     /* If the parent is not a VOUT object, that means we are at the start of
  85      * the video output pipe */
  86     if( p_parent->i_object_type != VLC_OBJECT_VOUT )
  87     {
  88         /* look for the default filter configuration */
  89         p_vout->psz_filter_chain = config_GetPsz( p_parent, "filter" );
  90     }
  91     else
  92     {
  93         /* continue the parent's filter chain */
  94         char *psz_end;
  95
  96         psz_end = strchr( ((vout_thread_t *)p_parent)->psz_filter_chain, ':' );
  97         if( psz_end && *(psz_end+1) )
  98             p_vout->psz_filter_chain = strdup( psz_end+1 );
  99         else p_vout->psz_filter_chain = NULL;
 100     }
 101
 102     /* Choose the video output module */
 103     if( !p_vout->psz_filter_chain )
 104     {
 105         psz_plugin = config_GetPsz( p_parent, "vout" );
 106     }
 107     else
 108     {
 109         /* the filter chain is a string list of filters separated by double
 110          * colons */
 111         char *psz_end;
 112
 113         psz_end = strchr( p_vout->psz_filter_chain, ':' );
 114         if( psz_end )
 115             psz_plugin = strndup( p_vout->psz_filter_chain,
 116                                   psz_end - p_vout->psz_filter_chain );
 117         else psz_plugin = strdup( p_vout->psz_filter_chain );
 118     }
 119
 120     /* Initialize pictures and subpictures - translation tables and functions
 121      * will be initialized later in InitThread */
 122     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++)
 123     {
 124         p_vout->p_picture[i_index].i_status = FREE_PICTURE;
 125         p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
 126     }
 127
 128     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++)
 129     {
 130         p_vout->p_subpicture[i_index].i_status = FREE_SUBPICTURE;
 131         p_vout->p_subpicture[i_index].i_type   = EMPTY_SUBPICTURE;
 132     }
 133
 134     /* No images in the heap */
 135     p_vout->i_heap_size = 0;
 136
 137     /* Initialize the rendering heap */
 138     I_RENDERPICTURES = 0;
 139     p_vout->render.i_width    = i_width;
 140     p_vout->render.i_height   = i_height;
 141     p_vout->render.i_chroma   = i_chroma;
 142     p_vout->render.i_aspect   = i_aspect;
 143
 144     p_vout->render.i_rmask    = 0;
 145     p_vout->render.i_gmask    = 0;
 146     p_vout->render.i_bmask    = 0;
 147
 148     /* Zero the output heap */
 149     I_OUTPUTPICTURES = 0;
 150     p_vout->output.i_width    = 0;
 151     p_vout->output.i_height   = 0;
 152     p_vout->output.i_chroma   = 0;
 153     p_vout->output.i_aspect   = 0;
 154
 155     p_vout->output.i_rmask    = 0;
 156     p_vout->output.i_gmask    = 0;
 157     p_vout->output.i_bmask    = 0;
 158
 159     /* Initialize misc stuff */
 160     p_vout->i_changes    = 0;
 161     p_vout->f_gamma      = 0;
 162     p_vout->b_grayscale  = 0;
 163     p_vout->b_info       = 0;
 164     p_vout->b_interface  = 0;
 165     p_vout->b_scale      = 1;
 166     p_vout->b_fullscreen = 0;
 167     p_vout->render_time  = 10;
 168     p_vout->c_fps_samples= 0;
 169
 170     p_vout->i_mouse_x = 0;
 171     p_vout->i_mouse_y = 0;
 172     p_vout->i_mouse_button = 0;
 173
 174     /* user requested fullscreen? */
 175     if( config_GetInt( p_vout, "fullscreen" ) )
 176     {
 177         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 178     }
 179
 180     /* Initialize the dimensions of the video window */
 181     InitWindowSize( p_vout, &p_vout->i_window_width,
 182                     &p_vout->i_window_height );
 183
 184
 185     p_vout->p_module = module_Need( p_vout,
 186                            ( p_vout->psz_filter_chain ) ?
 187                            MODULE_CAPABILITY_VOUT_FILTER :
 188                            MODULE_CAPABILITY_VOUT,
 189                            psz_plugin, (void *)p_vout );
 190
 191     if( psz_plugin ) free( psz_plugin );
 192     if( p_vout->p_module == NULL )
 193     {
 194         msg_Err( p_vout, "no suitable vout module" );
 195         vlc_object_destroy( p_vout );
 196         return( NULL );
 197     }
 198
 199 #define f p_vout->p_module->p_functions->vout.functions.vout
 200     p_vout->pf_create     = f.pf_create;
 201     p_vout->pf_init       = f.pf_init;
 202     p_vout->pf_end        = f.pf_end;
 203     p_vout->pf_destroy    = f.pf_destroy;
 204     p_vout->pf_manage     = f.pf_manage;
 205     p_vout->pf_render     = f.pf_render;
 206     p_vout->pf_display    = f.pf_display;
 207 #undef f
 208
 209     /* Create thread and set locks */
 210     vlc_mutex_init( p_vout, &p_vout->picture_lock );
 211     vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
 212     vlc_mutex_init( p_vout, &p_vout->change_lock );
 213
 214     vlc_object_attach( p_vout, p_parent );
 215
 216     if( vlc_thread_create( p_vout, "video output", RunThread, 0 ) )
 217     {
 218         msg_Err( p_vout, "%s", strerror(ENOMEM) );
 219         p_vout->pf_destroy( p_vout );
 220         module_Unneed( p_vout->p_module );
 221         vlc_object_destroy( p_vout );
 222         return NULL;
 223     }
 224
 225     return p_vout;
 226 }
 227
 228 /*****************************************************************************
 229  * vout_DestroyThread: destroys a previously created thread
 230  *****************************************************************************
 231  * Destroy a terminated thread.
 232  * The function will request a destruction of the specified thread. If pi_error
 233  * is NULL, it will return once the thread is destroyed. Else, it will be
 234  * update using one of the THREAD_* constants.
 235  *****************************************************************************/
 236 void vout_DestroyThread( vout_thread_t *p_vout )
 237 {
 238     /* Unlink object */
 239     vlc_object_detach_all( p_vout );
 240
 241     /* Request thread destruction */
 242     p_vout->b_die = 1;
 243     vlc_thread_join( p_vout );
 244
 245     /* Free structure */
 246     vlc_object_destroy( p_vout );
 247 }
 248
 249 /*****************************************************************************
 250  * vout_ChromaCmp: compare two chroma values
 251  *****************************************************************************
 252  * This function returns 1 if the two fourcc values given as argument are
 253  * the same format (eg. UYVY / UYNV) or almost the same format (eg. I420/YV12)
 254  *****************************************************************************/
 255 int vout_ChromaCmp( u32 i_chroma, u32 i_amorhc )
 256 {
 257     /* If they are the same, they are the same ! */
 258     if( i_chroma == i_amorhc )
 259     {
 260         return 1;
 261     }
 262
 263     /* Check for equivalence classes */
 264     switch( i_chroma )
 265     {
 266         case FOURCC_I420:
 267         case FOURCC_IYUV:
 268         case FOURCC_YV12:
 269             switch( i_amorhc )
 270             {
 271                 case FOURCC_I420:
 272                 case FOURCC_IYUV:
 273                 case FOURCC_YV12:
 274                     return 1;
 275
 276                 default:
 277                     return 0;
 278             }
 279
 280         case FOURCC_UYVY:
 281         case FOURCC_UYNV:
 282         case FOURCC_Y422:
 283             switch( i_amorhc )
 284             {
 285                 case FOURCC_UYVY:
 286                 case FOURCC_UYNV:
 287                 case FOURCC_Y422:
 288                     return 1;
 289
 290                 default:
 291                     return 0;
 292             }
 293
 294         case FOURCC_YUY2:
 295         case FOURCC_YUNV:
 296             switch( i_amorhc )
 297             {
 298                 case FOURCC_YUY2:
 299                 case FOURCC_YUNV:
 300                     return 1;
 301
 302                 default:
 303                     return 0;
 304             }
 305
 306         default:
 307             return 0;
 308     }
 309 }
 310
 311 /*****************************************************************************
 312  * InitThread: initialize video output thread
 313  *****************************************************************************
 314  * This function is called from RunThread and performs the second step of the
 315  * initialization. It returns 0 on success. Note that the thread's flag are not
 316  * modified inside this function.
 317  *****************************************************************************/
 318 static int InitThread( vout_thread_t *p_vout )
 319 {
 320     int i, i_pgcd;
 321
 322     vlc_mutex_lock( &p_vout->change_lock );
 323
 324 #ifdef STATS
 325     p_vout->c_loops = 0;
 326 #endif
 327
 328     /* Initialize output method, it allocates direct buffers for us */
 329     if( p_vout->pf_init( p_vout ) )
 330     {
 331         vlc_mutex_unlock( &p_vout->change_lock );
 332         return( 1 );
 333     }
 334
 335     if( !I_OUTPUTPICTURES )
 336     {
 337         msg_Err( p_vout, "plugin was unable to allocate at least "
 338                          "one direct buffer" );
 339         p_vout->pf_end( p_vout );
 340         vlc_mutex_unlock( &p_vout->change_lock );
 341         return( 1 );
 342     }
 343
 344     msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
 345
 346     i_pgcd = ReduceHeight( p_vout->render.i_aspect );
 347     msg_Dbg( p_vout,
 348              "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 349              p_vout->render.i_width, p_vout->render.i_height,
 350              p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 351              p_vout->render.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 352
 353     i_pgcd = ReduceHeight( p_vout->output.i_aspect );
 354     msg_Dbg( p_vout,
 355              "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 356              p_vout->output.i_width, p_vout->output.i_height,
 357              p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 358              p_vout->output.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 359
 360     /* Calculate shifts from system-updated masks */
 361     MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
 362                  p_vout->output.i_rmask );
 363     MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
 364                  p_vout->output.i_gmask );
 365     MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
 366                  p_vout->output.i_bmask );
 367
 368     /* Check whether we managed to create direct buffers similar to
 369      * the render buffers, ie same size, chroma and aspect ratio */
 370     if( ( p_vout->output.i_width == p_vout->render.i_width )
 371      && ( p_vout->output.i_height == p_vout->render.i_height )
 372      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) )
 373      && ( p_vout->output.i_aspect == p_vout->render.i_aspect ) )
 374     {
 375         /* Cool ! We have direct buffers, we can ask the decoder to
 376          * directly decode into them ! Map the first render buffers to
 377          * the first direct buffers, but keep the first direct buffer
 378          * for memcpy operations */
 379         p_vout->b_direct = 1;
 380
 381         msg_Dbg( p_vout, "direct render, mapping "
 382                  "render pictures 0-%i to system pictures 1-%i",
 383                  VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 384
 385         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 386         {
 387             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 388             I_RENDERPICTURES++;
 389         }
 390     }
 391     else
 392     {
 393         /* Rats... Something is wrong here, we could not find an output
 394          * plugin able to directly render what we decode. See if we can
 395          * find a chroma plugin to do the conversion */
 396         p_vout->b_direct = 0;
 397
 398         /* Choose the best module */
 399         p_vout->chroma.p_module =
 400             module_Need( p_vout, MODULE_CAPABILITY_CHROMA,
 401                          NULL, (void *)p_vout );
 402
 403         if( p_vout->chroma.p_module == NULL )
 404         {
 405             msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
 406                      &p_vout->render.i_chroma, &p_vout->output.i_chroma );
 407             p_vout->pf_end( p_vout );
 408             vlc_mutex_unlock( &p_vout->change_lock );
 409             return( 1 );
 410         }
 411
 412 #define f p_vout->chroma.p_module->p_functions->chroma.functions.chroma
 413         p_vout->chroma.pf_init       = f.pf_init;
 414         p_vout->chroma.pf_end        = f.pf_end;
 415 #undef f
 416
 417         if( I_OUTPUTPICTURES < 2 * VOUT_MAX_PICTURES )
 418         {
 419             msg_Dbg( p_vout, "indirect render, mapping "
 420                      "render pictures %i-%i to system pictures %i-%i",
 421                      I_OUTPUTPICTURES - 1, 2 * VOUT_MAX_PICTURES - 2,
 422                      I_OUTPUTPICTURES, 2 * VOUT_MAX_PICTURES - 1 );
 423         }
 424         else
 425         {
 426             /* FIXME: if this happens, we don't have any render pictures left */
 427             msg_Dbg( p_vout, "indirect render, no system pictures needed,"
 428                      " we have %i directbuffers", I_OUTPUTPICTURES );
 429             msg_Err( p_vout, "this is a bug!" );
 430         }
 431
 432         /* Append render buffers after the direct buffers */
 433         for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
 434         {
 435             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 436             I_RENDERPICTURES++;
 437         }
 438     }
 439
 440     /* Link pictures back to their heap */
 441     for( i = 0 ; i < I_RENDERPICTURES ; i++ )
 442     {
 443         PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
 444     }
 445
 446     for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
 447     {
 448         PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
 449     }
 450
 451 /* XXX XXX mark thread ready */
 452     return( 0 );
 453 }
 454
 455 /*****************************************************************************
 456  * RunThread: video output thread
 457  *****************************************************************************
 458  * Video output thread. This function does only returns when the thread is
 459  * terminated. It handles the pictures arriving in the video heap and the
 460  * display device events.
 461  *****************************************************************************/
 462 static void RunThread( vout_thread_t *p_vout)
 463 {
 464     int             i_index;                                /* index in heap */
 465     int             i_idle_loops = 0;  /* loops without displaying a picture */
 466     mtime_t         current_date;                            /* current date */
 467     mtime_t         display_date;                            /* display date */
 468
 469     picture_t *     p_picture;                            /* picture pointer */
 470     picture_t *     p_last_picture = NULL;                   /* last picture */
 471     picture_t *     p_directbuffer;              /* direct buffer to display */
 472
 473     subpicture_t *  p_subpic;                          /* subpicture pointer */
 474
 475     /*
 476      * Initialize thread
 477      */
 478     p_vout->b_error = InitThread( p_vout );
 479     if( p_vout->b_error )
 480     {
 481         /* Destroy thread structures allocated by Create and InitThread */
 482         p_vout->pf_destroy( p_vout );
 483
 484         DestroyThread( p_vout );
 485         return;
 486     }
 487
 488     /*
 489      * Main loop - it is not executed if an error occured during
 490      * initialization
 491      */
 492     while( (!p_vout->b_die) && (!p_vout->b_error) )
 493     {
 494         /* Initialize loop variables */
 495         display_date = 0;
 496         current_date = mdate();
 497
 498 #ifdef STATS
 499         p_vout->c_loops++;
 500         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 501         {
 502             msg_Dbg( p_vout, "picture heap: %d/%d",
 503                      I_RENDERPICTURES, p_vout->i_heap_size );
 504         }
 505 #endif
 506
 507         /*
 508          * Find the picture to display - this operation does not need lock,
 509          * since only READY_PICTUREs are handled
 510          */
 511         p_picture = NULL;
 512
 513         for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 514         {
 515             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 516                 && ( (p_picture == NULL) ||
 517                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 518             {
 519                 p_picture = PP_RENDERPICTURE[i_index];
 520                 display_date = p_picture->date;
 521             }
 522         }
 523
 524         if( p_picture != NULL )
 525         {
 526             /* If we met the last picture, parse again to see whether there is
 527              * a more appropriate one. */
 528             if( p_picture == p_last_picture )
 529             {
 530                 for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 531                 {
 532                     if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 533                         && (PP_RENDERPICTURE[i_index] != p_last_picture)
 534                         && ((p_picture == p_last_picture) ||
 535                             (PP_RENDERPICTURE[i_index]->date < display_date)) )
 536                     {
 537                         p_picture = PP_RENDERPICTURE[i_index];
 538                         display_date = p_picture->date;
 539                     }
 540                 }
 541             }
 542
 543             /* If we found better than the last picture, destroy it */
 544             if( p_last_picture && p_picture != p_last_picture )
 545             {
 546                 vlc_mutex_lock( &p_vout->picture_lock );
 547                 if( p_last_picture->i_refcount )
 548                 {
 549                     p_last_picture->i_status = DISPLAYED_PICTURE;
 550                 }
 551                 else
 552                 {
 553                     p_last_picture->i_status = DESTROYED_PICTURE;
 554                     p_vout->i_heap_size--;
 555                 }
 556                 vlc_mutex_unlock( &p_vout->picture_lock );
 557                 p_last_picture = NULL;
 558             }
 559
 560             /* Compute FPS rate */
 561             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 562                 = display_date;
 563
 564             if( !p_picture->b_force &&
 565                 p_picture != p_last_picture &&
 566                 display_date < current_date + p_vout->render_time )
 567             {
 568                 /* Picture is late: it will be destroyed and the thread
 569                  * will directly choose the next picture */
 570                 vlc_mutex_lock( &p_vout->picture_lock );
 571                 if( p_picture->i_refcount )
 572                 {
 573                     /* Pretend we displayed the picture, but don't destroy
 574                      * it since the decoder might still need it. */
 575                     p_picture->i_status = DISPLAYED_PICTURE;
 576                 }
 577                 else
 578                 {
 579                     /* Destroy the picture without displaying it */
 580                     p_picture->i_status = DESTROYED_PICTURE;
 581                     p_vout->i_heap_size--;
 582                 }
 583                 msg_Warn( p_vout, "late picture skipped (%lld)",
 584                                   current_date - display_date );
 585                 vlc_mutex_unlock( &p_vout->picture_lock );
 586
 587                 continue;
 588             }
 589 #if 0
 590             /* Removed because it causes problems for some people --Meuuh */
 591             if( display_date > current_date + VOUT_BOGUS_DELAY )
 592             {
 593                 /* Picture is waaay too early: it will be destroyed */
 594                 vlc_mutex_lock( &p_vout->picture_lock );
 595                 if( p_picture->i_refcount )
 596                 {
 597                     /* Pretend we displayed the picture, but don't destroy
 598                      * it since the decoder might still need it. */
 599                     p_picture->i_status = DISPLAYED_PICTURE;
 600                 }
 601                 else
 602                 {
 603                     /* Destroy the picture without displaying it */
 604                     p_picture->i_status = DESTROYED_PICTURE;
 605                     p_vout->i_heap_size--;
 606                 }
 607                 intf_WarnMsg( 1, "vout warning: early picture skipped (%lld)",
 608                               display_date - current_date );
 609                 vlc_mutex_unlock( &p_vout->picture_lock );
 610
 611                 continue;
 612             }
 613 #endif
 614             if( display_date > current_date + VOUT_DISPLAY_DELAY )
 615             {
 616                 /* A picture is ready to be rendered, but its rendering date
 617                  * is far from the current one so the thread will perform an
 618                  * empty loop as if no picture were found. The picture state
 619                  * is unchanged */
 620                 p_picture    = NULL;
 621                 display_date = 0;
 622             }
 623             else if( p_picture == p_last_picture )
 624             {
 625                 /* We are asked to repeat the previous picture, but we first
 626                  * wait for a couple of idle loops */
 627                 if( i_idle_loops < 4 )
 628                 {
 629                     p_picture    = NULL;
 630                     display_date = 0;
 631                 }
 632                 else
 633                 {
 634                     //intf_WarnMsg( 6, "vout info: duplicating picture" );
 635                 }
 636             }
 637         }
 638
 639         if( p_picture == NULL )
 640         {
 641             i_idle_loops++;
 642         }
 643
 644         /*
 645          * Check for subpictures to display
 646          */
 647         p_subpic = vout_SortSubPictures( p_vout, display_date );
 648
 649         /*
 650          * Perform rendering
 651          */
 652         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 653
 654         /*
 655          * Call the plugin-specific rendering method
 656          */
 657         if( p_picture != NULL )
 658         {
 659             /* Render the direct buffer returned by vout_RenderPicture */
 660             p_vout->pf_render( p_vout, p_directbuffer );
 661         }
 662
 663         /*
 664          * Sleep, wake up
 665          */
 666         if( display_date != 0 )
 667         {
 668             /* Store render time using Bresenham algorithm */
 669             p_vout->render_time += mdate() - current_date;
 670             p_vout->render_time >>= 1;
 671         }
 672
 673         /* Give back change lock */
 674         vlc_mutex_unlock( &p_vout->change_lock );
 675
 676         /* Sleep a while or until a given date */
 677         if( display_date != 0 )
 678         {
 679             mwait( display_date - VOUT_MWAIT_TOLERANCE );
 680         }
 681         else
 682         {
 683             msleep( VOUT_IDLE_SLEEP );
 684         }
 685
 686         /* On awakening, take back lock and send immediately picture
 687          * to display. */
 688         vlc_mutex_lock( &p_vout->change_lock );
 689
 690         /*
 691          * Display the previously rendered picture
 692          */
 693         if( p_picture != NULL )
 694         {
 695             /* Display the direct buffer returned by vout_RenderPicture */
 696             p_vout->pf_display( p_vout, p_directbuffer );
 697
 698             /* Reinitialize idle loop count */
 699             i_idle_loops = 0;
 700
 701             /* Tell the vout this was the last picture and that it does not
 702              * need to be forced anymore. */
 703             p_last_picture = p_picture;
 704             p_last_picture->b_force = 0;
 705         }
 706
 707         /*
 708          * Check events and manage thread
 709          */
 710         if( p_vout->pf_manage( p_vout ) )
 711         {
 712             /* A fatal error occured, and the thread must terminate
 713              * immediately, without displaying anything - setting b_error to 1
 714              * causes the immediate end of the main while() loop. */
 715             p_vout->b_error = 1;
 716         }
 717
 718         if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 719         {
 720             /* this must only happen when the vout plugin is incapable of
 721              * rescaling the picture itself. In this case we need to destroy
 722              * the current picture buffers and recreate new ones with the right
 723              * dimensions */
 724             int i;
 725
 726             p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 727
 728             p_vout->pf_end( p_vout );
 729             for( i = 0; i < I_OUTPUTPICTURES; i++ )
 730                  p_vout->p_picture[ i ].i_status = FREE_PICTURE;
 731
 732             I_OUTPUTPICTURES = 0;
 733             if( p_vout->pf_init( p_vout ) )
 734             {
 735                 msg_Err( p_vout, "cannot resize display" );
 736                 /* FixMe: p_vout->pf_end will be called again in EndThread() */
 737                 p_vout->b_error = 1;
 738             }
 739
 740             /* Need to reinitialise the chroma plugin */
 741             p_vout->chroma.pf_end( p_vout );
 742             p_vout->chroma.pf_init( p_vout );
 743         }
 744
 745     }
 746
 747     /*
 748      * Error loop - wait until the thread destruction is requested
 749      */
 750     if( p_vout->b_error )
 751     {
 752         ErrorThread( p_vout );
 753     }
 754
 755     /* End of thread */
 756     EndThread( p_vout );
 757
 758     /* Destroy method-dependant resources */
 759     p_vout->pf_destroy( p_vout );
 760
 761     /* Destroy thread structures allocated by CreateThread */
 762     DestroyThread( p_vout );
 763 }
 764
 765 /*****************************************************************************
 766  * ErrorThread: RunThread() error loop
 767  *****************************************************************************
 768  * This function is called when an error occured during thread main's loop. The
 769  * thread can still receive feed, but must be ready to terminate as soon as
 770  * possible.
 771  *****************************************************************************/
 772 static void ErrorThread( vout_thread_t *p_vout )
 773 {
 774     /* Wait until a `die' order */
 775     while( !p_vout->b_die )
 776     {
 777         /* Sleep a while */
 778         msleep( VOUT_IDLE_SLEEP );
 779     }
 780 }
 781
 782 /*****************************************************************************
 783  * EndThread: thread destruction
 784  *****************************************************************************
 785  * This function is called when the thread ends after a sucessful
 786  * initialization. It frees all ressources allocated by InitThread.
 787  *****************************************************************************/
 788 static void EndThread( vout_thread_t *p_vout )
 789 {
 790     int     i_index;                                        /* index in heap */
 791
 792 #ifdef STATS
 793     {
 794         struct tms cpu_usage;
 795         times( &cpu_usage );
 796
 797         msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
 798                  cpu_usage.tms_utime, cpu_usage.tms_stime );
 799     }
 800 #endif
 801
 802     if( !p_vout->b_direct )
 803     {
 804         p_vout->chroma.pf_end( p_vout );
 805         module_Unneed( p_vout->chroma.p_module );
 806     }
 807
 808     /* Destroy all remaining pictures */
 809     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++ )
 810     {
 811         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
 812         {
 813             free( p_vout->p_picture[i_index].p_data_orig );
 814         }
 815     }
 816
 817     /* Destroy all remaining subpictures */
 818     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
 819     {
 820         if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
 821         {
 822             free( p_vout->p_subpicture[i_index].p_sys );
 823         }
 824     }
 825
 826     /* Destroy translation tables */
 827     p_vout->pf_end( p_vout );
 828
 829     /* Release the change lock */
 830     vlc_mutex_unlock( &p_vout->change_lock );
 831 }
 832
 833 /*****************************************************************************
 834  * DestroyThread: thread destruction
 835  *****************************************************************************
 836  * This function is called when the thread ends. It frees all ressources
 837  * allocated by CreateThread. Status is available at this stage.
 838  *****************************************************************************/
 839 static void DestroyThread( vout_thread_t *p_vout )
 840 {
 841     /* Destroy the locks */
 842     vlc_mutex_destroy( &p_vout->picture_lock );
 843     vlc_mutex_destroy( &p_vout->subpicture_lock );
 844     vlc_mutex_destroy( &p_vout->change_lock );
 845
 846     /* Release the module */
 847     module_Unneed( p_vout->p_module );
 848 }
 849
 850 /* following functions are local */
 851
 852 static int ReduceHeight( int i_ratio )
 853 {
 854     int i_dummy = VOUT_ASPECT_FACTOR;
 855     int i_pgcd  = 1;
 856
 857     if( !i_ratio )
 858     {
 859         return i_pgcd;
 860     }
 861
 862     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
 863     while( !(i_ratio & 1) && !(i_dummy & 1) )
 864     {
 865         i_ratio >>= 1;
 866         i_dummy >>= 1;
 867         i_pgcd  <<= 1;
 868     }
 869
 870     while( !(i_ratio % 3) && !(i_dummy % 3) )
 871     {
 872         i_ratio /= 3;
 873         i_dummy /= 3;
 874         i_pgcd  *= 3;
 875     }
 876
 877     while( !(i_ratio % 5) && !(i_dummy % 5) )
 878     {
 879         i_ratio /= 5;
 880         i_dummy /= 5;
 881         i_pgcd  *= 5;
 882     }
 883
 884     return i_pgcd;
 885 }
 886
 887 /*****************************************************************************
 888  * BinaryLog: computes the base 2 log of a binary value
 889  *****************************************************************************
 890  * This functions is used by MaskToShift, to get a bit index from a binary
 891  * value.
 892  *****************************************************************************/
 893 static int BinaryLog(u32 i)
 894 {
 895     int i_log = 0;
 896
 897     if( i == 0 ) return -31337;
 898
 899     if( i & 0xffff0000 ) i_log += 16;
 900     if( i & 0xff00ff00 ) i_log += 8;
 901     if( i & 0xf0f0f0f0 ) i_log += 4;
 902     if( i & 0xcccccccc ) i_log += 2;
 903     if( i & 0xaaaaaaaa ) i_log += 1;
 904
 905     return( i_log );
 906 }
 907
 908 /*****************************************************************************
 909  * MaskToShift: transform a color mask into right and left shifts
 910  *****************************************************************************
 911  * This function is used for obtaining color shifts from masks.
 912  *****************************************************************************/
 913 static void MaskToShift( int *pi_left, int *pi_right, u32 i_mask )
 914 {
 915     u32 i_low, i_high;                 /* lower hand higher bits of the mask */
 916
 917     if( !i_mask )
 918     {
 919         *pi_left = *pi_right = 0;
 920         return;
 921     }
 922
 923     /* Get bits */
 924     i_low =  i_mask & (- i_mask);                   /* lower bit of the mask */
 925     i_high = i_mask + i_low;                       /* higher bit of the mask */
 926
 927     /* Transform bits into an index */
 928     i_low =  BinaryLog (i_low);
 929     i_high = BinaryLog (i_high);
 930
 931     /* Update pointers and return */
 932     *pi_left =   i_low;
 933     *pi_right = (8 - i_high + i_low);
 934 }
 935
 936 /*****************************************************************************
 937  * InitWindowSize: find the initial dimensions the video window should have.
 938  *****************************************************************************
 939  * This function will check the "width", "height" and "zoom" config options and
 940  * will calculate the size that the video window should have.
 941  *****************************************************************************/
 942 static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
 943                             int *pi_height )
 944 {
 945     int i_width, i_height;
 946     double f_zoom;
 947
 948     i_width = config_GetInt( p_vout, "width" );
 949     i_height = config_GetInt( p_vout, "height" );
 950     f_zoom = config_GetFloat( p_vout, "zoom" );
 951
 952     if( (i_width >= 0) && (i_height >= 0))
 953     {
 954         *pi_width = i_width * f_zoom;
 955         *pi_height = i_height * f_zoom;
 956         return;
 957     }
 958     else if( i_width >= 0 )
 959     {
 960         *pi_width = i_width * f_zoom;
 961         *pi_height = i_width * f_zoom * VOUT_ASPECT_FACTOR /
 962                         p_vout->render.i_aspect;
 963         return;
 964     }
 965     else if( i_height >= 0 )
 966     {
 967         *pi_height = i_height * f_zoom;
 968         *pi_width = i_height * f_zoom * p_vout->render.i_aspect /
 969                        VOUT_ASPECT_FACTOR;
 970         return;
 971     }
 972
 973     if( p_vout->render.i_height * p_vout->render.i_aspect
 974         >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
 975     {
 976         *pi_width = p_vout->render.i_height * f_zoom
 977           * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR;
 978         *pi_height = p_vout->render.i_height * f_zoom;
 979     }
 980     else
 981     {
 982         *pi_width = p_vout->render.i_width * f_zoom;
 983         *pi_height = p_vout->render.i_width * f_zoom
 984           * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect;
 985     }
 986 }