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) 2000-2004 VideoLAN
   8  * $Id$
   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 <stdlib.h>                                                /* free() */
  31
  32 #include <vlc/vlc.h>
  33
  34 #ifdef HAVE_SYS_TIMES_H
  35 #   include <sys/times.h>
  36 #endif
  37
  38 #include "vlc_video.h"
  39 #include "video_output.h"
  40 #include <vlc/input.h>                 /* for input_thread_t and i_pts_delay */
  41
  42 #if defined( SYS_DARWIN )
  43 #include "darwin_specific.h"
  44 #endif
  45
  46 /*****************************************************************************
  47  * Local prototypes
  48  *****************************************************************************/
  49 static int      InitThread        ( vout_thread_t * );
  50 static void     RunThread         ( vout_thread_t * );
  51 static void     ErrorThread       ( vout_thread_t * );
  52 static void     EndThread         ( vout_thread_t * );
  53 static void     DestroyThread     ( vout_thread_t * );
  54
  55 static void     AspectRatio       ( int, int *, int * );
  56 static int      BinaryLog         ( uint32_t );
  57 static void     MaskToShift       ( int *, int *, uint32_t );
  58 static void     InitWindowSize    ( vout_thread_t *, int *, int * );
  59
  60 /* Object variables callbacks */
  61 static int DeinterlaceCallback( vlc_object_t *, char const *,
  62                                 vlc_value_t, vlc_value_t, void * );
  63 static int FilterCallback( vlc_object_t *, char const *,
  64                            vlc_value_t, vlc_value_t, void * );
  65
  66 /*****************************************************************************
  67  * vout_Request: find a video output thread, create one, or destroy one.
  68  *****************************************************************************
  69  * This function looks for a video output thread matching the current
  70  * properties. If not found, it spawns a new one.
  71  *****************************************************************************/
  72 vout_thread_t * __vout_Request ( vlc_object_t *p_this, vout_thread_t *p_vout,
  73                                  unsigned int i_width, unsigned int i_height,
  74                                  vlc_fourcc_t i_chroma, unsigned int i_aspect )
  75 {
  76     if( !i_width || !i_height || !i_chroma )
  77     {
  78         /* Reattach video output to input before bailing out */
  79         if( p_vout )
  80         {
  81             vlc_object_t *p_playlist;
  82
  83             p_playlist = vlc_object_find( p_this, VLC_OBJECT_PLAYLIST,
  84                                           FIND_ANYWHERE );
  85
  86             if( p_playlist )
  87             {
  88                 vout_AttachSPU( p_vout, p_this, VLC_FALSE );
  89                 vlc_object_detach( p_vout );
  90                 vlc_object_attach( p_vout, p_playlist );
  91
  92                 vlc_object_release( p_playlist );
  93             }
  94             else
  95             {
  96                 msg_Dbg( p_this, "cannot find playlist, destroying vout" );
  97                 vlc_object_detach( p_vout );
  98                 vout_Destroy( p_vout );
  99             }
 100         }
 101         return NULL;
 102     }
 103
 104     /* If a video output was provided, lock it, otherwise look for one. */
 105     if( p_vout )
 106     {
 107         vlc_object_yield( p_vout );
 108     }
 109     else
 110     {
 111         p_vout = vlc_object_find( p_this, VLC_OBJECT_VOUT, FIND_CHILD );
 112
 113         if( !p_vout )
 114         {
 115             vlc_object_t *p_playlist;
 116
 117             p_playlist = vlc_object_find( p_this,
 118                                           VLC_OBJECT_PLAYLIST, FIND_ANYWHERE );
 119             if( p_playlist )
 120             {
 121                 p_vout = vlc_object_find( p_playlist,
 122                                           VLC_OBJECT_VOUT, FIND_CHILD );
 123                 /* only first children of p_input for unused vout */
 124                 if( p_vout && p_vout->p_parent != p_playlist )
 125                 {
 126                     vlc_object_release( p_vout );
 127                     p_vout = NULL;
 128                 }
 129                 vlc_object_release( p_playlist );
 130             }
 131         }
 132     }
 133
 134     /* If we now have a video output, check it has the right properties */
 135     if( p_vout )
 136     {
 137         char *psz_filter_chain;
 138
 139         /* We don't directly check for the "filter" variable for obvious
 140          * performance reasons. */
 141         if( p_vout->b_filter_change )
 142         {
 143             psz_filter_chain = config_GetPsz( p_this, "filter" );
 144
 145             if( psz_filter_chain && !*psz_filter_chain )
 146             {
 147                 free( psz_filter_chain );
 148                 psz_filter_chain = NULL;
 149             }
 150             if( p_vout->psz_filter_chain && !*p_vout->psz_filter_chain )
 151             {
 152                 free( p_vout->psz_filter_chain );
 153                 p_vout->psz_filter_chain = NULL;
 154             }
 155
 156             if( ( !psz_filter_chain && !p_vout->psz_filter_chain ) ||
 157                 ( psz_filter_chain && p_vout->psz_filter_chain &&
 158                   !strcmp( psz_filter_chain, p_vout->psz_filter_chain ) ) )
 159             {
 160                 p_vout->b_filter_change = VLC_FALSE;
 161             }
 162
 163             if( psz_filter_chain ) free( psz_filter_chain );
 164         }
 165
 166         if( ( p_vout->render.i_width != i_width ) ||
 167             ( p_vout->render.i_height != i_height ) ||
 168             ( p_vout->render.i_chroma != i_chroma ) ||
 169             ( p_vout->render.i_aspect != i_aspect
 170                     && !p_vout->b_override_aspect ) ||
 171             p_vout->b_filter_change )
 172         {
 173             /* We are not interested in this format, close this vout */
 174             vlc_object_detach( p_vout );
 175             vlc_object_release( p_vout );
 176             vout_Destroy( p_vout );
 177             p_vout = NULL;
 178         }
 179         else
 180         {
 181             /* This video output is cool! Hijack it. */
 182             vlc_object_detach( p_vout );
 183             vout_AttachSPU( p_vout, p_this, VLC_TRUE );
 184             vlc_object_attach( p_vout, p_this );
 185             vlc_object_release( p_vout );
 186         }
 187     }
 188
 189     if( !p_vout )
 190     {
 191         msg_Dbg( p_this, "no usable vout present, spawning one" );
 192
 193         p_vout = vout_Create( p_this, i_width, i_height, i_chroma, i_aspect );
 194     }
 195
 196     return p_vout;
 197 }
 198
 199 /*****************************************************************************
 200  * vout_Create: creates a new video output thread
 201  *****************************************************************************
 202  * This function creates a new video output thread, and returns a pointer
 203  * to its description. On error, it returns NULL.
 204  *****************************************************************************/
 205 vout_thread_t * __vout_Create( vlc_object_t *p_parent,
 206                                unsigned int i_width, unsigned int i_height,
 207                                vlc_fourcc_t i_chroma, unsigned int i_aspect )
 208 {
 209     vout_thread_t  * p_vout;                            /* thread descriptor */
 210     input_thread_t * p_input_thread;
 211     int              i_index;                               /* loop variable */
 212     char           * psz_plugin;
 213     vlc_value_t      val, text;
 214
 215     /* Allocate descriptor */
 216     p_vout = vlc_object_create( p_parent, VLC_OBJECT_VOUT );
 217     if( p_vout == NULL )
 218     {
 219         msg_Err( p_parent, "out of memory" );
 220         return NULL;
 221     }
 222
 223     /* Initialize pictures - translation tables and functions
 224      * will be initialized later in InitThread */
 225     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES + 1; i_index++)
 226     {
 227         p_vout->p_picture[i_index].pf_lock = NULL;
 228         p_vout->p_picture[i_index].pf_unlock = NULL;
 229         p_vout->p_picture[i_index].i_status = FREE_PICTURE;
 230         p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
 231         p_vout->p_picture[i_index].b_slow   = 0;
 232     }
 233
 234     /* No images in the heap */
 235     p_vout->i_heap_size = 0;
 236
 237     /* Register the default subpicture channel */
 238     p_vout->p_default_channel = NULL;
 239     p_vout->i_channel_count = 1;
 240
 241     /* Initialize the rendering heap */
 242     I_RENDERPICTURES = 0;
 243     p_vout->render.i_width    = i_width;
 244     p_vout->render.i_height   = i_height;
 245     p_vout->render.i_chroma   = i_chroma;
 246     p_vout->render.i_aspect   = i_aspect;
 247
 248     p_vout->render.i_rmask    = 0;
 249     p_vout->render.i_gmask    = 0;
 250     p_vout->render.i_bmask    = 0;
 251
 252     p_vout->render.i_last_used_pic = -1;
 253     p_vout->render.b_allow_modify_pics = 1;
 254
 255     /* Zero the output heap */
 256     I_OUTPUTPICTURES = 0;
 257     p_vout->output.i_width    = 0;
 258     p_vout->output.i_height   = 0;
 259     p_vout->output.i_chroma   = 0;
 260     p_vout->output.i_aspect   = 0;
 261
 262     p_vout->output.i_rmask    = 0;
 263     p_vout->output.i_gmask    = 0;
 264     p_vout->output.i_bmask    = 0;
 265
 266     /* Initialize misc stuff */
 267     p_vout->i_changes    = 0;
 268     p_vout->f_gamma      = 0;
 269     p_vout->b_grayscale  = 0;
 270     p_vout->b_info       = 0;
 271     p_vout->b_interface  = 0;
 272     p_vout->b_scale      = 1;
 273     p_vout->b_fullscreen = 0;
 274     p_vout->i_alignment  = 0;
 275     p_vout->render_time  = 10;
 276     p_vout->c_fps_samples = 0;
 277     p_vout->b_filter_change = 0;
 278     p_vout->pf_control = 0;
 279     p_vout->p_parent_intf = 0;
 280
 281     /* Initialize locks */
 282     vlc_mutex_init( p_vout, &p_vout->picture_lock );
 283     vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
 284     vlc_mutex_init( p_vout, &p_vout->change_lock );
 285
 286     /* Mouse coordinates */
 287     var_Create( p_vout, "mouse-x", VLC_VAR_INTEGER );
 288     var_Create( p_vout, "mouse-y", VLC_VAR_INTEGER );
 289     var_Create( p_vout, "mouse-button-down", VLC_VAR_INTEGER );
 290     var_Create( p_vout, "mouse-moved", VLC_VAR_BOOL );
 291     var_Create( p_vout, "mouse-clicked", VLC_VAR_INTEGER );
 292
 293     /* Initialize subpicture unit */
 294     vout_InitSPU( p_vout );
 295     vout_AttachSPU( p_vout, p_parent, VLC_TRUE );
 296
 297     /* Attach the new object now so we can use var inheritance below */
 298     vlc_object_attach( p_vout, p_parent );
 299
 300     /* Take care of some "interface/control" related initialisations */
 301     vout_IntfInit( p_vout );
 302
 303     p_vout->b_override_aspect = VLC_FALSE;
 304
 305     /* If the parent is not a VOUT object, that means we are at the start of
 306      * the video output pipe */
 307     if( p_parent->i_object_type != VLC_OBJECT_VOUT )
 308     {
 309         var_Get( p_vout, "aspect-ratio", &val );
 310
 311         /* Check whether the user tried to override aspect ratio */
 312         if( val.psz_string )
 313         {
 314             unsigned int i_new_aspect = i_aspect;
 315             char *psz_parser = strchr( val.psz_string, ':' );
 316
 317             if( psz_parser )
 318             {
 319                 *psz_parser++ = '\0';
 320                 i_new_aspect = atoi( val.psz_string ) * VOUT_ASPECT_FACTOR
 321                                                       / atoi( psz_parser );
 322             }
 323             else
 324             {
 325                 i_new_aspect = i_width * VOUT_ASPECT_FACTOR
 326                                        * atof( val.psz_string )
 327                                        / i_height;
 328             }
 329
 330             free( val.psz_string );
 331
 332             if( i_new_aspect && i_new_aspect != i_aspect )
 333             {
 334                 int i_aspect_x, i_aspect_y;
 335
 336                 AspectRatio( i_new_aspect, &i_aspect_x, &i_aspect_y );
 337
 338                 msg_Dbg( p_vout, "overriding source aspect ratio to %i:%i",
 339                          i_aspect_x, i_aspect_y );
 340
 341                 p_vout->render.i_aspect = i_new_aspect;
 342
 343                 p_vout->b_override_aspect = VLC_TRUE;
 344             }
 345         }
 346
 347         /* Look for the default filter configuration */
 348         var_Create( p_vout, "filter", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
 349         var_Get( p_vout, "filter", &val );
 350         p_vout->psz_filter_chain = val.psz_string;
 351     }
 352     else
 353     {
 354         /* continue the parent's filter chain */
 355         char *psz_end;
 356
 357         psz_end = strchr( ((vout_thread_t *)p_parent)->psz_filter_chain, ':' );
 358         if( psz_end && *(psz_end+1) )
 359             p_vout->psz_filter_chain = strdup( psz_end+1 );
 360         else p_vout->psz_filter_chain = NULL;
 361     }
 362
 363     /* Choose the video output module */
 364     if( !p_vout->psz_filter_chain || !*p_vout->psz_filter_chain )
 365     {
 366         var_Create( p_vout, "vout", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
 367         var_Get( p_vout, "vout", &val );
 368         psz_plugin = val.psz_string;
 369     }
 370     else
 371     {
 372         /* the filter chain is a string list of filters separated by double
 373          * colons */
 374         char *psz_end;
 375
 376         psz_end = strchr( p_vout->psz_filter_chain, ':' );
 377         if( psz_end )
 378             psz_plugin = strndup( p_vout->psz_filter_chain,
 379                                   psz_end - p_vout->psz_filter_chain );
 380         else psz_plugin = strdup( p_vout->psz_filter_chain );
 381     }
 382
 383     /* Initialize the dimensions of the video window */
 384     InitWindowSize( p_vout, &p_vout->i_window_width,
 385                     &p_vout->i_window_height );
 386
 387     /* Create the vout thread */
 388     p_vout->p_module = module_Need( p_vout,
 389         ( p_vout->psz_filter_chain && *p_vout->psz_filter_chain ) ?
 390         "video filter" : "video output", psz_plugin, 0 );
 391
 392     if( psz_plugin ) free( psz_plugin );
 393     if( p_vout->p_module == NULL )
 394     {
 395         msg_Err( p_vout, "no suitable vout module" );
 396         vlc_object_detach( p_vout );
 397         vlc_object_destroy( p_vout );
 398         return NULL;
 399     }
 400
 401     /* Create a few object variables for interface interaction */
 402     var_Create( p_vout, "deinterlace", VLC_VAR_STRING | VLC_VAR_HASCHOICE );
 403     text.psz_string = _("Deinterlace");
 404     var_Change( p_vout, "deinterlace", VLC_VAR_SETTEXT, &text, NULL );
 405     val.psz_string = ""; text.psz_string = _("Disable");
 406     var_Change( p_vout, "deinterlace", VLC_VAR_ADDCHOICE, &val, &text );
 407     val.psz_string = "discard"; text.psz_string = _("Discard");
 408     var_Change( p_vout, "deinterlace", VLC_VAR_ADDCHOICE, &val, &text );
 409     val.psz_string = "blend"; text.psz_string = _("Blend");
 410     var_Change( p_vout, "deinterlace", VLC_VAR_ADDCHOICE, &val, &text );
 411     val.psz_string = "mean"; text.psz_string = _("Mean");
 412     var_Change( p_vout, "deinterlace", VLC_VAR_ADDCHOICE, &val, &text );
 413     val.psz_string = "bob"; text.psz_string = _("Bob");
 414     var_Change( p_vout, "deinterlace", VLC_VAR_ADDCHOICE, &val, &text );
 415     val.psz_string = "linear"; text.psz_string = _("Linear");
 416     var_Change( p_vout, "deinterlace", VLC_VAR_ADDCHOICE, &val, &text );
 417     if( var_Get( p_vout, "deinterlace-mode", &val ) == VLC_SUCCESS )
 418     {
 419         var_Set( p_vout, "deinterlace", val );
 420         if( val.psz_string ) free( val.psz_string );
 421     }
 422     var_AddCallback( p_vout, "deinterlace", DeinterlaceCallback, NULL );
 423
 424
 425     var_Create( p_vout, "filter", VLC_VAR_STRING );
 426     text.psz_string = _("Filters");
 427     var_Change( p_vout, "filter", VLC_VAR_SETTEXT, &text, NULL );
 428     var_Change( p_vout, "filter", VLC_VAR_INHERITVALUE, &val, NULL );
 429     if( val.psz_string )
 430     {
 431         var_Set( p_vout, "filter", val );
 432         free( val.psz_string );
 433     }
 434     var_AddCallback( p_vout, "filter", FilterCallback, NULL );
 435
 436     /* Calculate delay created by internal caching */
 437     p_input_thread = (input_thread_t *)vlc_object_find( p_vout,
 438                                            VLC_OBJECT_INPUT, FIND_ANYWHERE );
 439     if( p_input_thread )
 440     {
 441         p_vout->i_pts_delay = p_input_thread->i_pts_delay;
 442         vlc_object_release( p_input_thread );
 443     }
 444     else
 445     {
 446         p_vout->i_pts_delay = DEFAULT_PTS_DELAY;
 447     }
 448
 449     if( vlc_thread_create( p_vout, "video output", RunThread,
 450                            VLC_THREAD_PRIORITY_OUTPUT, VLC_TRUE ) )
 451     {
 452         msg_Err( p_vout, "out of memory" );
 453         module_Unneed( p_vout, p_vout->p_module );
 454         vlc_object_detach( p_vout );
 455         vlc_object_destroy( p_vout );
 456         return NULL;
 457     }
 458
 459     if( p_vout->b_error )
 460     {
 461         msg_Err( p_vout, "video output creation failed" );
 462
 463         /* Make sure the thread is destroyed */
 464         p_vout->b_die = VLC_TRUE;
 465
 466         vlc_thread_join( p_vout );
 467
 468         vlc_object_detach( p_vout );
 469         vlc_object_destroy( p_vout );
 470         return NULL;
 471     }
 472
 473     return p_vout;
 474 }
 475
 476 /*****************************************************************************
 477  * vout_Destroy: destroys a previously created video output
 478  *****************************************************************************
 479  * Destroy a terminated thread.
 480  * The function will request a destruction of the specified thread. If pi_error
 481  * is NULL, it will return once the thread is destroyed. Else, it will be
 482  * update using one of the THREAD_* constants.
 483  *****************************************************************************/
 484 void vout_Destroy( vout_thread_t *p_vout )
 485 {
 486     vlc_object_t *p_playlist;
 487
 488     /* Request thread destruction */
 489     p_vout->b_die = VLC_TRUE;
 490     vlc_thread_join( p_vout );
 491
 492     var_Destroy( p_vout, "intf-change" );
 493
 494     p_playlist = vlc_object_find( p_vout, VLC_OBJECT_PLAYLIST,
 495                                   FIND_ANYWHERE );
 496
 497     if( p_vout->psz_filter_chain ) free( p_vout->psz_filter_chain );
 498
 499     /* Free structure */
 500     vlc_object_destroy( p_vout );
 501
 502     /* If it was the last vout, tell the interface to show up */
 503     if( p_playlist != NULL )
 504     {
 505         vout_thread_t *p_another_vout = vlc_object_find( p_playlist,
 506                                             VLC_OBJECT_VOUT, FIND_ANYWHERE );
 507         if( p_another_vout == NULL )
 508         {
 509             vlc_value_t val;
 510             val.b_bool = VLC_TRUE;
 511             var_Set( p_playlist, "intf-show", val );
 512         }
 513         else
 514         {
 515             vlc_object_release( p_another_vout );
 516         }
 517         vlc_object_release( p_playlist );
 518     }
 519 }
 520
 521 /*****************************************************************************
 522  * InitThread: initialize video output thread
 523  *****************************************************************************
 524  * This function is called from RunThread and performs the second step of the
 525  * initialization. It returns 0 on success. Note that the thread's flag are not
 526  * modified inside this function.
 527  *****************************************************************************/
 528 static int InitThread( vout_thread_t *p_vout )
 529 {
 530     int i, i_aspect_x, i_aspect_y;
 531
 532     vlc_mutex_lock( &p_vout->change_lock );
 533
 534 #ifdef STATS
 535     p_vout->c_loops = 0;
 536 #endif
 537
 538     /* Initialize output method, it allocates direct buffers for us */
 539     if( p_vout->pf_init( p_vout ) )
 540     {
 541         vlc_mutex_unlock( &p_vout->change_lock );
 542         return VLC_EGENERIC;
 543     }
 544
 545     if( !I_OUTPUTPICTURES )
 546     {
 547         msg_Err( p_vout, "plugin was unable to allocate at least "
 548                          "one direct buffer" );
 549         p_vout->pf_end( p_vout );
 550         vlc_mutex_unlock( &p_vout->change_lock );
 551         return VLC_EGENERIC;
 552     }
 553
 554     if( I_OUTPUTPICTURES > VOUT_MAX_PICTURES )
 555     {
 556         msg_Err( p_vout, "plugin allocated too many direct buffers, "
 557                          "our internal buffers must have overflown." );
 558         p_vout->pf_end( p_vout );
 559         vlc_mutex_unlock( &p_vout->change_lock );
 560         return VLC_EGENERIC;
 561     }
 562
 563     msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
 564
 565 #if 0
 566     if( !p_vout->psz_filter_chain )
 567     {
 568         char *psz_aspect = config_GetPsz( p_vout, "pixel-ratio" );
 569
 570         if( psz_aspect )
 571         {
 572             int i_new_aspect = p_vout->output.i_width * VOUT_ASPECT_FACTOR
 573                                                       * atof( psz_aspect )
 574                                                       / p_vout->output.i_height;
 575             free( psz_aspect );
 576
 577             if( i_new_aspect && i_new_aspect != p_vout->output.i_aspect )
 578             {
 579                 AspectRatio( i_new_aspect, &i_aspect_x, &i_aspect_y );
 580
 581                 msg_Dbg( p_vout, "output ratio forced to %i:%i\n",
 582                          i_aspect_x, i_aspect_y );
 583                 p_vout->output.i_aspect = i_new_aspect;
 584             }
 585         }
 586     }
 587 #endif
 588
 589     AspectRatio( p_vout->render.i_aspect, &i_aspect_x, &i_aspect_y );
 590     msg_Dbg( p_vout,
 591              "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 592              p_vout->render.i_width, p_vout->render.i_height,
 593              p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 594              i_aspect_x, i_aspect_y );
 595
 596     AspectRatio( p_vout->output.i_aspect, &i_aspect_x, &i_aspect_y );
 597     msg_Dbg( p_vout,
 598              "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 599              p_vout->output.i_width, p_vout->output.i_height,
 600              p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 601              i_aspect_x, i_aspect_y );
 602
 603     /* Calculate shifts from system-updated masks */
 604     MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
 605                  p_vout->output.i_rmask );
 606     MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
 607                  p_vout->output.i_gmask );
 608     MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
 609                  p_vout->output.i_bmask );
 610
 611     /* Check whether we managed to create direct buffers similar to
 612      * the render buffers, ie same size and chroma */
 613     if( ( p_vout->output.i_width == p_vout->render.i_width )
 614      && ( p_vout->output.i_height == p_vout->render.i_height )
 615      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) ) )
 616     {
 617         /* Cool ! We have direct buffers, we can ask the decoder to
 618          * directly decode into them ! Map the first render buffers to
 619          * the first direct buffers, but keep the first direct buffer
 620          * for memcpy operations */
 621         p_vout->b_direct = 1;
 622
 623         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 624         {
 625             if( p_vout->p_picture[ i ].i_type != DIRECT_PICTURE &&
 626                 I_RENDERPICTURES >= VOUT_MIN_DIRECT_PICTURES - 1 &&
 627                 p_vout->p_picture[ i - 1 ].i_type == DIRECT_PICTURE )
 628             {
 629                 /* We have enough direct buffers so there's no need to
 630                  * try to use system memory buffers. */
 631                 break;
 632             }
 633             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 634             I_RENDERPICTURES++;
 635         }
 636
 637         msg_Dbg( p_vout, "direct render, mapping "
 638                  "render pictures 0-%i to system pictures 1-%i",
 639                  VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 640     }
 641     else
 642     {
 643         /* Rats... Something is wrong here, we could not find an output
 644          * plugin able to directly render what we decode. See if we can
 645          * find a chroma plugin to do the conversion */
 646         p_vout->b_direct = 0;
 647
 648         /* Choose the best module */
 649         p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL, 0 );
 650
 651         if( p_vout->chroma.p_module == NULL )
 652         {
 653             msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
 654                      (char*)&p_vout->render.i_chroma,
 655                      (char*)&p_vout->output.i_chroma );
 656             p_vout->pf_end( p_vout );
 657             vlc_mutex_unlock( &p_vout->change_lock );
 658             return VLC_EGENERIC;
 659         }
 660
 661         msg_Dbg( p_vout, "indirect render, mapping "
 662                  "render pictures 0-%i to system pictures %i-%i",
 663                  VOUT_MAX_PICTURES - 1, I_OUTPUTPICTURES,
 664                  I_OUTPUTPICTURES + VOUT_MAX_PICTURES - 1 );
 665
 666         /* Append render buffers after the direct buffers */
 667         for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
 668         {
 669             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 670             I_RENDERPICTURES++;
 671
 672             /* Check if we have enough render pictures */
 673             if( I_RENDERPICTURES == VOUT_MAX_PICTURES )
 674                 break;
 675         }
 676     }
 677
 678     /* Link pictures back to their heap */
 679     for( i = 0 ; i < I_RENDERPICTURES ; i++ )
 680     {
 681         PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
 682     }
 683
 684     for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
 685     {
 686         PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
 687     }
 688
 689 /* XXX XXX mark thread ready */
 690     return VLC_SUCCESS;
 691 }
 692
 693 /*****************************************************************************
 694  * RunThread: video output thread
 695  *****************************************************************************
 696  * Video output thread. This function does only returns when the thread is
 697  * terminated. It handles the pictures arriving in the video heap and the
 698  * display device events.
 699  *****************************************************************************/
 700 static void RunThread( vout_thread_t *p_vout)
 701 {
 702     int             i_index;                                /* index in heap */
 703     int             i_idle_loops = 0;  /* loops without displaying a picture */
 704     mtime_t         current_date;                            /* current date */
 705     mtime_t         display_date;                            /* display date */
 706
 707     picture_t *     p_picture;                            /* picture pointer */
 708     picture_t *     p_last_picture = NULL;                   /* last picture */
 709     picture_t *     p_directbuffer;              /* direct buffer to display */
 710
 711     subpicture_t *  p_subpic;                          /* subpicture pointer */
 712
 713     /*
 714      * Initialize thread
 715      */
 716     p_vout->b_error = InitThread( p_vout );
 717
 718     /* signal the creation of the vout */
 719     vlc_thread_ready( p_vout );
 720
 721     if( p_vout->b_error )
 722     {
 723         /* Destroy thread structures allocated by Create and InitThread */
 724         DestroyThread( p_vout );
 725         return;
 726     }
 727
 728     /*
 729      * Main loop - it is not executed if an error occurred during
 730      * initialization
 731      */
 732     while( (!p_vout->b_die) && (!p_vout->b_error) )
 733     {
 734         /* Initialize loop variables */
 735         p_picture = NULL;
 736         display_date = 0;
 737         current_date = mdate();
 738
 739 #if 0
 740         p_vout->c_loops++;
 741         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 742         {
 743             msg_Dbg( p_vout, "picture heap: %d/%d",
 744                      I_RENDERPICTURES, p_vout->i_heap_size );
 745         }
 746 #endif
 747
 748         /*
 749          * Find the picture to display (the one with the earliest date).
 750          * This operation does not need lock, since only READY_PICTUREs
 751          * are handled. */
 752         for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 753         {
 754             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 755                 && ( (p_picture == NULL) ||
 756                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 757             {
 758                 p_picture = PP_RENDERPICTURE[i_index];
 759                 display_date = p_picture->date;
 760             }
 761         }
 762
 763         if( p_picture )
 764         {
 765             /* If we met the last picture, parse again to see whether there is
 766              * a more appropriate one. */
 767             if( p_picture == p_last_picture )
 768             {
 769                 for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 770                 {
 771                     if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 772                         && (PP_RENDERPICTURE[i_index] != p_last_picture)
 773                         && ((p_picture == p_last_picture) ||
 774                             (PP_RENDERPICTURE[i_index]->date < display_date)) )
 775                     {
 776                         p_picture = PP_RENDERPICTURE[i_index];
 777                         display_date = p_picture->date;
 778                     }
 779                 }
 780             }
 781
 782             /* If we found better than the last picture, destroy it */
 783             if( p_last_picture && p_picture != p_last_picture )
 784             {
 785                 vlc_mutex_lock( &p_vout->picture_lock );
 786                 if( p_last_picture->i_refcount )
 787                 {
 788                     p_last_picture->i_status = DISPLAYED_PICTURE;
 789                 }
 790                 else
 791                 {
 792                     p_last_picture->i_status = DESTROYED_PICTURE;
 793                     p_vout->i_heap_size--;
 794                 }
 795                 vlc_mutex_unlock( &p_vout->picture_lock );
 796                 p_last_picture = NULL;
 797             }
 798
 799             /* Compute FPS rate */
 800             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 801                 = display_date;
 802
 803             if( !p_picture->b_force &&
 804                 p_picture != p_last_picture &&
 805                 display_date < current_date + p_vout->render_time )
 806             {
 807                 /* Picture is late: it will be destroyed and the thread
 808                  * will directly choose the next picture */
 809                 vlc_mutex_lock( &p_vout->picture_lock );
 810                 if( p_picture->i_refcount )
 811                 {
 812                     /* Pretend we displayed the picture, but don't destroy
 813                      * it since the decoder might still need it. */
 814                     p_picture->i_status = DISPLAYED_PICTURE;
 815                 }
 816                 else
 817                 {
 818                     /* Destroy the picture without displaying it */
 819                     p_picture->i_status = DESTROYED_PICTURE;
 820                     p_vout->i_heap_size--;
 821                 }
 822                 msg_Warn( p_vout, "late picture skipped ("I64Fd")",
 823                                   current_date - display_date );
 824                 vlc_mutex_unlock( &p_vout->picture_lock );
 825
 826                 continue;
 827             }
 828
 829             if( display_date >
 830                 current_date + p_vout->i_pts_delay + VOUT_BOGUS_DELAY )
 831             {
 832                 /* Picture is waaay too early: it will be destroyed */
 833                 vlc_mutex_lock( &p_vout->picture_lock );
 834                 if( p_picture->i_refcount )
 835                 {
 836                     /* Pretend we displayed the picture, but don't destroy
 837                      * it since the decoder might still need it. */
 838                     p_picture->i_status = DISPLAYED_PICTURE;
 839                 }
 840                 else
 841                 {
 842                     /* Destroy the picture without displaying it */
 843                     p_picture->i_status = DESTROYED_PICTURE;
 844                     p_vout->i_heap_size--;
 845                 }
 846                 msg_Warn( p_vout, "vout warning: early picture skipped "
 847                           "("I64Fd")", display_date - current_date
 848                           - p_vout->i_pts_delay );
 849                 vlc_mutex_unlock( &p_vout->picture_lock );
 850
 851                 continue;
 852             }
 853
 854             if( display_date > current_date + VOUT_DISPLAY_DELAY )
 855             {
 856                 /* A picture is ready to be rendered, but its rendering date
 857                  * is far from the current one so the thread will perform an
 858                  * empty loop as if no picture were found. The picture state
 859                  * is unchanged */
 860                 p_picture    = NULL;
 861                 display_date = 0;
 862             }
 863             else if( p_picture == p_last_picture )
 864             {
 865                 /* We are asked to repeat the previous picture, but we first
 866                  * wait for a couple of idle loops */
 867                 if( i_idle_loops < 4 )
 868                 {
 869                     p_picture    = NULL;
 870                     display_date = 0;
 871                 }
 872                 else
 873                 {
 874                     /* We set the display date to something high, otherwise
 875                      * we'll have lots of problems with late pictures */
 876                     display_date = current_date + p_vout->render_time;
 877                 }
 878             }
 879         }
 880
 881         if( p_picture == NULL )
 882         {
 883             i_idle_loops++;
 884         }
 885
 886         /*
 887          * Check for subpictures to display
 888          */
 889         p_subpic = vout_SortSubPictures( p_vout, display_date );
 890
 891         /*
 892          * Perform rendering
 893          */
 894         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 895
 896         /*
 897          * Call the plugin-specific rendering method if there is one
 898          */
 899         if( p_picture != NULL && p_directbuffer != NULL && p_vout->pf_render )
 900         {
 901             /* Render the direct buffer returned by vout_RenderPicture */
 902             p_vout->pf_render( p_vout, p_directbuffer );
 903         }
 904
 905         /*
 906          * Sleep, wake up
 907          */
 908         if( display_date != 0 && p_directbuffer != NULL )
 909         {
 910             mtime_t current_render_time = mdate() - current_date;
 911             /* if render time is very large we don't include it in the mean */
 912             if( current_render_time < p_vout->render_time +
 913                 VOUT_DISPLAY_DELAY )
 914             {
 915                 /* Store render time using a sliding mean weighting to
 916                  * current value in a 3 to 1 ratio*/
 917                 p_vout->render_time *= 3;
 918                 p_vout->render_time += current_render_time;
 919                 p_vout->render_time >>= 2;
 920             }
 921         }
 922
 923         /* Give back change lock */
 924         vlc_mutex_unlock( &p_vout->change_lock );
 925
 926         /* Sleep a while or until a given date */
 927         if( display_date != 0 )
 928         {
 929             /* If there are filters in the chain, better give them the picture
 930              * in advance */
 931             if( !p_vout->psz_filter_chain || !*p_vout->psz_filter_chain )
 932             {
 933                 mwait( display_date - VOUT_MWAIT_TOLERANCE );
 934             }
 935         }
 936         else
 937         {
 938             msleep( VOUT_IDLE_SLEEP );
 939         }
 940
 941         /* On awakening, take back lock and send immediately picture
 942          * to display. */
 943         vlc_mutex_lock( &p_vout->change_lock );
 944
 945         /*
 946          * Display the previously rendered picture
 947          */
 948         if( p_picture != NULL && p_directbuffer != NULL )
 949         {
 950             /* Display the direct buffer returned by vout_RenderPicture */
 951             if( p_vout->pf_display )
 952             {
 953                 p_vout->pf_display( p_vout, p_directbuffer );
 954             }
 955
 956             /* Tell the vout this was the last picture and that it does not
 957              * need to be forced anymore. */
 958             p_last_picture = p_picture;
 959             p_last_picture->b_force = 0;
 960         }
 961
 962         if( p_picture != NULL )
 963         {
 964             /* Reinitialize idle loop count */
 965             i_idle_loops = 0;
 966         }
 967
 968         /*
 969          * Check events and manage thread
 970          */
 971         if( p_vout->pf_manage && p_vout->pf_manage( p_vout ) )
 972         {
 973             /* A fatal error occurred, and the thread must terminate
 974              * immediately, without displaying anything - setting b_error to 1
 975              * causes the immediate end of the main while() loop. */
 976             p_vout->b_error = 1;
 977         }
 978
 979         if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 980         {
 981             /* this must only happen when the vout plugin is incapable of
 982              * rescaling the picture itself. In this case we need to destroy
 983              * the current picture buffers and recreate new ones with the right
 984              * dimensions */
 985             int i;
 986
 987             p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 988
 989             p_vout->pf_end( p_vout );
 990             for( i = 0; i < I_OUTPUTPICTURES; i++ )
 991                  p_vout->p_picture[ i ].i_status = FREE_PICTURE;
 992
 993             I_OUTPUTPICTURES = 0;
 994             if( p_vout->pf_init( p_vout ) )
 995             {
 996                 msg_Err( p_vout, "cannot resize display" );
 997                 /* FIXME: pf_end will be called again in EndThread() */
 998                 p_vout->b_error = 1;
 999             }
1000
1001             /* Need to reinitialise the chroma plugin */
1002             if( p_vout->chroma.p_module )
1003             {
1004                 if( p_vout->chroma.p_module->pf_deactivate )
1005                     p_vout->chroma.p_module->pf_deactivate( VLC_OBJECT(p_vout) );
1006                 p_vout->chroma.p_module->pf_activate( VLC_OBJECT(p_vout) );
1007             }
1008         }
1009
1010         if( p_vout->i_changes & VOUT_PICTURE_BUFFERS_CHANGE )
1011         {
1012             /* This happens when the picture buffers need to be recreated.
1013              * This is useful on multimonitor displays for instance.
1014              *
1015              * Warning: This only works when the vout creates only 1 picture
1016              * buffer!! */
1017             p_vout->i_changes &= ~VOUT_PICTURE_BUFFERS_CHANGE;
1018
1019             if( !p_vout->b_direct )
1020             {
1021                 module_Unneed( p_vout, p_vout->chroma.p_module );
1022             }
1023
1024             vlc_mutex_lock( &p_vout->picture_lock );
1025
1026             p_vout->pf_end( p_vout );
1027
1028             I_OUTPUTPICTURES = I_RENDERPICTURES = 0;
1029
1030             p_vout->b_error = InitThread( p_vout );
1031
1032             vlc_mutex_unlock( &p_vout->picture_lock );
1033         }
1034     }
1035
1036     /*
1037      * Error loop - wait until the thread destruction is requested
1038      */
1039     if( p_vout->b_error )
1040     {
1041         ErrorThread( p_vout );
1042     }
1043
1044     /* End of thread */
1045     EndThread( p_vout );
1046
1047     /* Destroy thread structures allocated by CreateThread */
1048     DestroyThread( p_vout );
1049 }
1050
1051 /*****************************************************************************
1052  * ErrorThread: RunThread() error loop
1053  *****************************************************************************
1054  * This function is called when an error occurred during thread main's loop.
1055  * The thread can still receive feed, but must be ready to terminate as soon
1056  * as possible.
1057  *****************************************************************************/
1058 static void ErrorThread( vout_thread_t *p_vout )
1059 {
1060     /* Wait until a `die' order */
1061     while( !p_vout->b_die )
1062     {
1063         /* Sleep a while */
1064         msleep( VOUT_IDLE_SLEEP );
1065     }
1066 }
1067
1068 /*****************************************************************************
1069  * EndThread: thread destruction
1070  *****************************************************************************
1071  * This function is called when the thread ends after a sucessful
1072  * initialization. It frees all resources allocated by InitThread.
1073  *****************************************************************************/
1074 static void EndThread( vout_thread_t *p_vout )
1075 {
1076     int     i_index;                                        /* index in heap */
1077
1078 #ifdef STATS
1079     {
1080         struct tms cpu_usage;
1081         times( &cpu_usage );
1082
1083         msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
1084                  cpu_usage.tms_utime, cpu_usage.tms_stime );
1085     }
1086 #endif
1087
1088     if( !p_vout->b_direct )
1089     {
1090         module_Unneed( p_vout, p_vout->chroma.p_module );
1091     }
1092
1093     /* Destroy all remaining pictures */
1094     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES + 1; i_index++ )
1095     {
1096         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
1097         {
1098             free( p_vout->p_picture[i_index].p_data_orig );
1099         }
1100     }
1101
1102     /* Destroy subpicture unit */
1103     vout_DestroySPU( p_vout );
1104
1105     /* Destroy translation tables */
1106     p_vout->pf_end( p_vout );
1107
1108     /* Release the change lock */
1109     vlc_mutex_unlock( &p_vout->change_lock );
1110 }
1111
1112 /*****************************************************************************
1113  * DestroyThread: thread destruction
1114  *****************************************************************************
1115  * This function is called when the thread ends. It frees all ressources
1116  * allocated by CreateThread. Status is available at this stage.
1117  *****************************************************************************/
1118 static void DestroyThread( vout_thread_t *p_vout )
1119 {
1120     /* Destroy the locks */
1121     vlc_mutex_destroy( &p_vout->picture_lock );
1122     vlc_mutex_destroy( &p_vout->subpicture_lock );
1123     vlc_mutex_destroy( &p_vout->change_lock );
1124
1125     /* Release the module */
1126     if( p_vout && p_vout->p_module )
1127     {
1128         module_Unneed( p_vout, p_vout->p_module );
1129     }
1130 }
1131
1132 /* following functions are local */
1133
1134 static int ReduceHeight( int i_ratio )
1135 {
1136     int i_dummy = VOUT_ASPECT_FACTOR;
1137     int i_pgcd  = 1;
1138
1139     if( !i_ratio )
1140     {
1141         return i_pgcd;
1142     }
1143
1144     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
1145     while( !(i_ratio & 1) && !(i_dummy & 1) )
1146     {
1147         i_ratio >>= 1;
1148         i_dummy >>= 1;
1149         i_pgcd  <<= 1;
1150     }
1151
1152     while( !(i_ratio % 3) && !(i_dummy % 3) )
1153     {
1154         i_ratio /= 3;
1155         i_dummy /= 3;
1156         i_pgcd  *= 3;
1157     }
1158
1159     while( !(i_ratio % 5) && !(i_dummy % 5) )
1160     {
1161         i_ratio /= 5;
1162         i_dummy /= 5;
1163         i_pgcd  *= 5;
1164     }
1165
1166     return i_pgcd;
1167 }
1168
1169 static void AspectRatio( int i_aspect, int *i_aspect_x, int *i_aspect_y )
1170 {
1171     unsigned int i_pgcd = ReduceHeight( i_aspect );
1172     *i_aspect_x = i_aspect / i_pgcd;
1173     *i_aspect_y = VOUT_ASPECT_FACTOR / i_pgcd;
1174 }
1175
1176 /*****************************************************************************
1177  * BinaryLog: computes the base 2 log of a binary value
1178  *****************************************************************************
1179  * This functions is used by MaskToShift, to get a bit index from a binary
1180  * value.
1181  *****************************************************************************/
1182 static int BinaryLog( uint32_t i )
1183 {
1184     int i_log = 0;
1185
1186     if( i == 0 ) return -31337;
1187
1188     if( i & 0xffff0000 ) i_log += 16;
1189     if( i & 0xff00ff00 ) i_log += 8;
1190     if( i & 0xf0f0f0f0 ) i_log += 4;
1191     if( i & 0xcccccccc ) i_log += 2;
1192     if( i & 0xaaaaaaaa ) i_log += 1;
1193
1194     return i_log;
1195 }
1196
1197 /*****************************************************************************
1198  * MaskToShift: transform a color mask into right and left shifts
1199  *****************************************************************************
1200  * This function is used for obtaining color shifts from masks.
1201  *****************************************************************************/
1202 static void MaskToShift( int *pi_left, int *pi_right, uint32_t i_mask )
1203 {
1204     uint32_t i_low, i_high;            /* lower hand higher bits of the mask */
1205
1206     if( !i_mask )
1207     {
1208         *pi_left = *pi_right = 0;
1209         return;
1210     }
1211
1212     /* Get bits */
1213     i_low =  i_mask & (- (int32_t)i_mask);          /* lower bit of the mask */
1214     i_high = i_mask + i_low;                       /* higher bit of the mask */
1215
1216     /* Transform bits into an index */
1217     i_low =  BinaryLog (i_low);
1218     i_high = BinaryLog (i_high);
1219
1220     /* Update pointers and return */
1221     *pi_left =   i_low;
1222     *pi_right = (8 - i_high + i_low);
1223 }
1224
1225 /*****************************************************************************
1226  * InitWindowSize: find the initial dimensions the video window should have.
1227  *****************************************************************************
1228  * This function will check the "width", "height" and "zoom" config options and
1229  * will calculate the size that the video window should have.
1230  *****************************************************************************/
1231 static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
1232                             int *pi_height )
1233 {
1234     vlc_value_t val;
1235     int i_width, i_height;
1236     uint64_t ll_zoom;
1237
1238 #define FP_FACTOR 1000                             /* our fixed point factor */
1239
1240     var_Get( p_vout, "align", &val );
1241     p_vout->i_alignment = val.i_int;
1242
1243     var_Get( p_vout, "width", &val );
1244     i_width = val.i_int;
1245     var_Get( p_vout, "height", &val );
1246     i_height = val.i_int;
1247     var_Get( p_vout, "zoom", &val );
1248     ll_zoom = (uint64_t)( FP_FACTOR * val.f_float );
1249
1250     if( i_width > 0 && i_height > 0)
1251     {
1252         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1253         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1254         return;
1255     }
1256     else if( i_width > 0 )
1257     {
1258         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1259         *pi_height = (int)( i_width * ll_zoom * VOUT_ASPECT_FACTOR /
1260                             p_vout->render.i_aspect / FP_FACTOR );
1261         return;
1262     }
1263     else if( i_height > 0 )
1264     {
1265         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1266         *pi_width = (int)( i_height * ll_zoom * p_vout->render.i_aspect /
1267                            VOUT_ASPECT_FACTOR / FP_FACTOR );
1268         return;
1269     }
1270
1271     if( p_vout->render.i_height * p_vout->render.i_aspect
1272         >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
1273     {
1274         *pi_width = (int)( p_vout->render.i_height * ll_zoom
1275           * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR / FP_FACTOR );
1276         *pi_height = (int)( p_vout->render.i_height * ll_zoom / FP_FACTOR );
1277     }
1278     else
1279     {
1280         *pi_width = (int)( p_vout->render.i_width * ll_zoom / FP_FACTOR );
1281         *pi_height = (int)( p_vout->render.i_width * ll_zoom
1282           * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect / FP_FACTOR );
1283     }
1284
1285 #undef FP_FACTOR
1286 }
1287
1288 /*****************************************************************************
1289  * vout_VarCallback: generic callback for intf variables
1290  *****************************************************************************/
1291 int vout_VarCallback( vlc_object_t * p_this, const char * psz_variable,
1292                       vlc_value_t old_value, vlc_value_t new_value,
1293                       void * unused )
1294 {
1295     vout_thread_t * p_vout = (vout_thread_t *)p_this;
1296     vlc_value_t val;
1297     val.b_bool = VLC_TRUE;
1298     var_Set( p_vout, "intf-change", val );
1299     return VLC_SUCCESS;
1300 }
1301
1302 /*****************************************************************************
1303  * object variables callbacks: a bunch of object variables are used by the
1304  * interfaces to interact with the vout.
1305  *****************************************************************************/
1306 static int DeinterlaceCallback( vlc_object_t *p_this, char const *psz_cmd,
1307                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
1308 {
1309     vout_thread_t *p_vout = (vout_thread_t *)p_this;
1310     input_thread_t *p_input;
1311     vlc_value_t val;
1312
1313     char *psz_mode = newval.psz_string;
1314     char *psz_filter;
1315
1316     psz_filter = config_GetPsz( p_vout, "filter" );
1317
1318     if( !psz_mode || !*psz_mode )
1319     {
1320         config_PutPsz( p_vout, "filter", "" );
1321     }
1322     else
1323     {
1324         if( !psz_filter || !*psz_filter )
1325         {
1326             config_PutPsz( p_vout, "filter", "deinterlace" );
1327         }
1328         else
1329         {
1330             if( strstr( psz_filter, "deinterlace" ) == NULL )
1331             {
1332                 psz_filter = realloc( psz_filter, strlen( psz_filter ) + 20 );
1333                 strcat( psz_filter, ",deinterlace" );
1334             }
1335             config_PutPsz( p_vout, "filter", psz_filter );
1336         }
1337     }
1338
1339     if( psz_filter ) free( psz_filter );
1340
1341
1342     p_input = (input_thread_t *)vlc_object_find( p_this, VLC_OBJECT_INPUT,
1343                                                  FIND_PARENT );
1344     if( !p_input ) return VLC_EGENERIC;
1345
1346     if( psz_mode && *psz_mode )
1347     {
1348         val.psz_string = psz_mode;
1349         var_Set( p_vout, "deinterlace-mode", val );
1350         /* Modify input as well because the vout might have to be restarted */
1351         var_Create( p_input, "deinterlace-mode", VLC_VAR_STRING );
1352         var_Set( p_input, "deinterlace-mode", val );
1353     }
1354
1355     /* Now restart current video stream */
1356     var_Get( p_input, "video-es", &val );
1357     if( val.i_int >= 0 )
1358     {
1359         p_vout->b_filter_change = VLC_TRUE;
1360         var_Set( p_input, "video-es", (vlc_value_t)-VIDEO_ES );
1361         var_Set( p_input, "video-es", val );
1362     }
1363
1364     vlc_object_release( p_input );
1365
1366     val.b_bool = VLC_TRUE;
1367     var_Set( p_vout, "intf-change", val );
1368     return VLC_SUCCESS;
1369 }
1370
1371 static int FilterCallback( vlc_object_t *p_this, char const *psz_cmd,
1372                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
1373 {
1374     vout_thread_t *p_vout = (vout_thread_t *)p_this;
1375     input_thread_t *p_input;
1376     vlc_value_t val;
1377
1378     p_input = (input_thread_t *)vlc_object_find( p_this, VLC_OBJECT_INPUT,
1379                                                  FIND_PARENT );
1380
1381     if (!p_input)
1382     {
1383         msg_Err( p_vout, "Input not found" );
1384         return( VLC_EGENERIC );
1385     }
1386
1387     /* Now restart current video stream */
1388     var_Get( p_input, "video-es", &val );
1389     if( val.i_int >= 0 )
1390     {
1391         p_vout->b_filter_change = VLC_TRUE;
1392         var_Set( p_input, "video-es", (vlc_value_t)-VIDEO_ES );
1393         var_Set( p_input, "video-es", val );
1394     }
1395
1396     vlc_object_release( p_input );
1397
1398     val.b_bool = VLC_TRUE;
1399     var_Set( p_vout, "intf-change", val );
1400     return VLC_SUCCESS;
1401 }