git.sesse.net Git - vlc/blob - modules/video_filter/wall.c

   1 /*****************************************************************************
   2  * wall.c : Wall video plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001, 2002, 2003 VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc/vout.h>
  32
  33 #include "filter_common.h"
  34
  35 /*****************************************************************************
  36  * Local prototypes
  37  *****************************************************************************/
  38 static int  Create    ( vlc_object_t * );
  39 static void Destroy   ( vlc_object_t * );
  40
  41 static int  Init      ( vout_thread_t * );
  42 static void End       ( vout_thread_t * );
  43 static void Render    ( vout_thread_t *, picture_t * );
  44
  45 static void RemoveAllVout  ( vout_thread_t *p_vout );
  46
  47 static int  SendEvents( vlc_object_t *, char const *,
  48                         vlc_value_t, vlc_value_t, void * );
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 #define COLS_TEXT N_("Number of columns")
  54 #define COLS_LONGTEXT N_("Select the number of horizontal video windows in " \
  55     "which to split the video.")
  56
  57 #define ROWS_TEXT N_("Number of rows")
  58 #define ROWS_LONGTEXT N_("Select the number of vertical video windows in " \
  59     "which to split the video.")
  60
  61 #define ACTIVE_TEXT N_("Active windows")
  62 #define ACTIVE_LONGTEXT N_("Comma separated list of active windows, " \
  63     "defaults to all")
  64
  65 vlc_module_begin();
  66     set_description( _("wall video filter") );
  67     set_shortname( N_("Image wall" ));
  68     set_capability( "video filter", 0 );
  69     set_category( CAT_VIDEO );
  70     set_subcategory( SUBCAT_VIDEO_VFILTER );
  71
  72     add_integer( "wall-cols", 3, NULL, COLS_TEXT, COLS_LONGTEXT, VLC_FALSE );
  73     add_integer( "wall-rows", 3, NULL, ROWS_TEXT, ROWS_LONGTEXT, VLC_FALSE );
  74     add_string( "wall-active", NULL, NULL, ACTIVE_TEXT, ACTIVE_LONGTEXT, VLC_FALSE );
  75
  76     add_shortcut( "wall" );
  77     set_callbacks( Create, Destroy );
  78 vlc_module_end();
  79
  80 /*****************************************************************************
  81  * vout_sys_t: Wall video output method descriptor
  82  *****************************************************************************
  83  * This structure is part of the video output thread descriptor.
  84  * It describes the Wall specific properties of an output thread.
  85  *****************************************************************************/
  86 struct vout_sys_t
  87 {
  88     int    i_col;
  89     int    i_row;
  90     int    i_vout;
  91     struct vout_list_t
  92     {
  93         vlc_bool_t b_active;
  94         int i_width;
  95         int i_height;
  96         int i_left;
  97         int i_top;
  98         vout_thread_t *p_vout;
  99     } *pp_vout;
 100 };
 101
 102 /*****************************************************************************
 103  * Control: control facility for the vout (forwards to child vout)
 104  *****************************************************************************/
 105 static int Control( vout_thread_t *p_vout, int i_query, va_list args )
 106 {
 107     int i_row, i_col, i_vout = 0;
 108
 109     for( i_row = 0; i_row < p_vout->p_sys->i_row; i_row++ )
 110     {
 111         for( i_col = 0; i_col < p_vout->p_sys->i_col; i_col++ )
 112         {
 113             vout_vaControl( p_vout->p_sys->pp_vout[ i_vout ].p_vout,
 114                             i_query, args );
 115             i_vout++;
 116         }
 117     }
 118     return VLC_SUCCESS;
 119 }
 120
 121 /*****************************************************************************
 122  * Create: allocates Wall video thread output method
 123  *****************************************************************************
 124  * This function allocates and initializes a Wall vout method.
 125  *****************************************************************************/
 126 static int Create( vlc_object_t *p_this )
 127 {
 128     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 129     char *psz_method, *psz_tmp, *psz_method_tmp;
 130     int i_vout;
 131
 132     /* Allocate structure */
 133     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
 134     if( p_vout->p_sys == NULL )
 135     {
 136         msg_Err( p_vout, "out of memory" );
 137         return VLC_ENOMEM;
 138     }
 139
 140     p_vout->pf_init = Init;
 141     p_vout->pf_end = End;
 142     p_vout->pf_manage = NULL;
 143     p_vout->pf_render = Render;
 144     p_vout->pf_display = NULL;
 145     p_vout->pf_control = Control;
 146
 147     /* Look what method was requested */
 148     p_vout->p_sys->i_col = config_GetInt( p_vout, "wall-cols" );
 149     p_vout->p_sys->i_row = config_GetInt( p_vout, "wall-rows" );
 150
 151     p_vout->p_sys->i_col = __MAX( 1, __MIN( 15, p_vout->p_sys->i_col ) );
 152     p_vout->p_sys->i_row = __MAX( 1, __MIN( 15, p_vout->p_sys->i_row ) );
 153
 154     msg_Dbg( p_vout, "opening a %i x %i wall",
 155              p_vout->p_sys->i_col, p_vout->p_sys->i_row );
 156
 157     p_vout->p_sys->pp_vout = malloc( p_vout->p_sys->i_row *
 158                                      p_vout->p_sys->i_col *
 159                                      sizeof(struct vout_list_t) );
 160     if( p_vout->p_sys->pp_vout == NULL )
 161     {
 162         msg_Err( p_vout, "out of memory" );
 163         free( p_vout->p_sys );
 164         return VLC_ENOMEM;
 165     }
 166
 167     psz_method_tmp = psz_method = config_GetPsz( p_vout, "wall-active" );
 168
 169     /* If no trailing vout are specified, take them all */
 170     if( psz_method == NULL )
 171     {
 172         for( i_vout = p_vout->p_sys->i_row * p_vout->p_sys->i_col;
 173              i_vout--; )
 174         {
 175             p_vout->p_sys->pp_vout[i_vout].b_active = 1;
 176         }
 177     }
 178     /* If trailing vout are specified, activate only the requested ones */
 179     else
 180     {
 181         for( i_vout = p_vout->p_sys->i_row * p_vout->p_sys->i_col;
 182              i_vout--; )
 183         {
 184             p_vout->p_sys->pp_vout[i_vout].b_active = 0;
 185         }
 186
 187         while( *psz_method )
 188         {
 189             psz_tmp = psz_method;
 190             while( *psz_tmp && *psz_tmp != ',' )
 191             {
 192                 psz_tmp++;
 193             }
 194
 195             if( *psz_tmp )
 196             {
 197                 *psz_tmp = '\0';
 198                 i_vout = atoi( psz_method );
 199                 psz_method = psz_tmp + 1;
 200             }
 201             else
 202             {
 203                 i_vout = atoi( psz_method );
 204                 psz_method = psz_tmp;
 205             }
 206
 207             if( i_vout >= 0 &&
 208                 i_vout < p_vout->p_sys->i_row * p_vout->p_sys->i_col )
 209             {
 210                 p_vout->p_sys->pp_vout[i_vout].b_active = 1;
 211             }
 212         }
 213     }
 214
 215     free( psz_method_tmp );
 216
 217     return VLC_SUCCESS;
 218 }
 219
 220 /*****************************************************************************
 221  * Init: initialize Wall video thread output method
 222  *****************************************************************************/
 223 static int Init( vout_thread_t *p_vout )
 224 {
 225     int i_index, i_row, i_col, i_width, i_height, i_left, i_top;
 226     unsigned int i_target_width,i_target_height;
 227     picture_t *p_pic;
 228     int i_aspect = 4*VOUT_ASPECT_FACTOR/3;
 229     int i_align = 0;
 230     unsigned int i_hstart, i_hend, i_vstart, i_vend;
 231     unsigned int w1,h1,w2,h2;
 232     int i_xpos, i_ypos;
 233     int i_vstart_rounded = 0, i_hstart_rounded = 0;
 234
 235     i_xpos = var_CreateGetInteger( p_vout, "video-x" );
 236     i_ypos = var_CreateGetInteger( p_vout, "video-y" );
 237     if( i_xpos < 0 ) i_xpos = 0;
 238     if( i_ypos < 0 ) i_ypos = 0;
 239
 240     I_OUTPUTPICTURES = 0;
 241
 242     /* Initialize the output structure */
 243     p_vout->output.i_chroma = p_vout->render.i_chroma;
 244     p_vout->output.i_width  = p_vout->render.i_width;
 245     p_vout->output.i_height = p_vout->render.i_height;
 246     p_vout->output.i_aspect = p_vout->render.i_aspect;
 247     var_Create( p_vout, "align", VLC_VAR_INTEGER );
 248
 249     w1 = p_vout->output.i_width / p_vout->p_sys->i_col;
 250     w1 &= ~1;
 251     h1 = w1 * VOUT_ASPECT_FACTOR / i_aspect&~1;
 252     h1 &= ~1;
 253
 254     h2 = p_vout->output.i_height / p_vout->p_sys->i_row&~1;
 255     h2 &= ~1;
 256     w2 = h2 * i_aspect / VOUT_ASPECT_FACTOR&~1;
 257     w2 &= ~1;
 258
 259     if ( h1 * p_vout->p_sys->i_row < p_vout->output.i_height )
 260     {
 261         unsigned int i_tmp;
 262         i_target_width = w2;
 263         i_target_height = h2;
 264         i_vstart = 0;
 265         i_vend = p_vout->output.i_height;
 266         i_tmp = i_target_width * p_vout->p_sys->i_col;
 267         while( i_tmp < p_vout->output.i_width ) i_tmp += p_vout->p_sys->i_col;
 268         i_hstart = (( i_tmp - p_vout->output.i_width ) / 2)&~1;
 269         i_hstart_rounded  = ( ( i_tmp - p_vout->output.i_width ) % 2 ) ||
 270             ( ( ( i_tmp - p_vout->output.i_width ) / 2 ) & 1 );
 271         i_hend = i_hstart + p_vout->output.i_width;
 272     }
 273     else
 274     {
 275         unsigned int i_tmp;
 276         i_target_height = h1;
 277         i_target_width = w1;
 278         i_hstart = 0;
 279         i_hend = p_vout->output.i_width;
 280         i_tmp = i_target_height * p_vout->p_sys->i_row;
 281         while( i_tmp < p_vout->output.i_height ) i_tmp += p_vout->p_sys->i_row;
 282         i_vstart = ( ( i_tmp - p_vout->output.i_height ) / 2 ) & ~1;
 283         i_vstart_rounded  = ( ( i_tmp - p_vout->output.i_height ) % 2 ) ||
 284             ( ( ( i_tmp - p_vout->output.i_height ) / 2 ) & 1 );
 285         i_vend = i_vstart + p_vout->output.i_height;
 286     }
 287     msg_Dbg( p_vout, "target resolution %dx%d", i_target_width, i_target_height );
 288
 289     /* Try to open the real video output */
 290     msg_Dbg( p_vout, "spawning the real video outputs" );
 291
 292     p_vout->p_sys->i_vout = 0;
 293     msg_Dbg( p_vout, "target window (%d,%d)-(%d,%d)", i_hstart,i_vstart,i_hend,i_vend );
 294
 295
 296     i_top = 0;
 297     i_height = 0;
 298     for( i_row = 0; i_row < p_vout->p_sys->i_row; i_row++ )
 299     {
 300         i_left = 0;
 301         i_top += i_height;
 302         for( i_col = 0; i_col < p_vout->p_sys->i_col; i_col++ )
 303         {
 304             i_align = 0;
 305
 306             if( i_col*i_target_width >= i_hstart &&
 307                 (i_col+1)*i_target_width <= i_hend )
 308             {
 309                 i_width = i_target_width;
 310             }
 311             else if( ( i_col + 1 ) * i_target_width < i_hstart ||
 312                      ( i_col * i_target_width ) > i_hend )
 313             {
 314                 i_width = 0;
 315             }
 316             else
 317             {
 318                 i_width = ( i_target_width - i_hstart % i_target_width );
 319                 if( i_col > ( p_vout->p_sys->i_col / 2 ) )
 320                 {
 321                     i_align |= VOUT_ALIGN_LEFT;
 322                     i_width -= i_hstart_rounded ? 2: 0;
 323                 }
 324                 else
 325                 {
 326                     i_align |= VOUT_ALIGN_RIGHT;
 327                 }
 328             }
 329
 330             if( i_row * i_target_height >= i_vstart &&
 331                 ( i_row + 1 ) * i_target_height <= i_vend )
 332             {
 333                 i_height = i_target_height;
 334             }
 335             else if( ( i_row + 1 ) * i_target_height < i_vstart ||
 336                      ( i_row * i_target_height ) > i_vend )
 337             {
 338                 i_height = 0;
 339             }
 340             else
 341             {
 342                 i_height = ( i_target_height -
 343                              i_vstart%i_target_height );
 344                 if(  i_row > ( p_vout->p_sys->i_row / 2 ) )
 345                 {
 346                     i_align |= VOUT_ALIGN_TOP;
 347                     i_height -= i_vstart_rounded ? 2: 0;
 348                 }
 349                 else
 350                 {
 351                     i_align |= VOUT_ALIGN_BOTTOM;
 352                 }
 353             }
 354             if( i_height == 0 || i_width == 0 )
 355             {
 356                 p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].b_active = VLC_FALSE;
 357             }
 358
 359             p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].i_width = i_width;
 360             p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].i_height = i_height;
 361             p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].i_left = i_left;
 362             p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].i_top = i_top;
 363             i_left += i_width;
 364
 365             if( !p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].b_active )
 366             {
 367                 p_vout->p_sys->i_vout++;
 368                 continue;
 369             }
 370             var_SetInteger( p_vout, "align", i_align );
 371             var_SetInteger( p_vout, "video-x", i_left + i_xpos - i_width);
 372             var_SetInteger( p_vout, "video-y", i_top + i_ypos );
 373
 374             p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].p_vout =
 375                 vout_Create( p_vout, i_width, i_height,
 376                              p_vout->render.i_chroma,
 377                              i_aspect * i_target_height / i_height *
 378                              i_width / i_target_width );
 379             if( p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].p_vout == NULL )
 380             {
 381                 msg_Err( p_vout, "failed to get %ix%i vout threads",
 382                                  p_vout->p_sys->i_col, p_vout->p_sys->i_row );
 383                 RemoveAllVout( p_vout );
 384                 return VLC_EGENERIC;
 385             }
 386             ADD_CALLBACKS(
 387                 p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].p_vout,
 388                 SendEvents );
 389             p_vout->p_sys->i_vout++;
 390         }
 391     }
 392
 393     ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
 394
 395     ADD_PARENT_CALLBACKS( SendEventsToChild );
 396
 397     return VLC_SUCCESS;
 398 }
 399
 400 /*****************************************************************************
 401  * End: terminate Wall video thread output method
 402  *****************************************************************************/
 403 static void End( vout_thread_t *p_vout )
 404 {
 405     int i_index;
 406
 407     /* Free the fake output buffers we allocated */
 408     for( i_index = I_OUTPUTPICTURES ; i_index ; )
 409     {
 410         i_index--;
 411         free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
 412     }
 413 }
 414
 415 /*****************************************************************************
 416  * Destroy: destroy Wall video thread output method
 417  *****************************************************************************
 418  * Terminate an output method created by WallCreateOutputMethod
 419  *****************************************************************************/
 420 static void Destroy( vlc_object_t *p_this )
 421 {
 422     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 423
 424     RemoveAllVout( p_vout );
 425
 426     DEL_PARENT_CALLBACKS( SendEventsToChild );
 427
 428     free( p_vout->p_sys->pp_vout );
 429     free( p_vout->p_sys );
 430 }
 431
 432 /*****************************************************************************
 433  * Render: displays previously rendered output
 434  *****************************************************************************
 435  * This function send the currently rendered image to Wall image, waits
 436  * until it is displayed and switch the two rendering buffers, preparing next
 437  * frame.
 438  *****************************************************************************/
 439 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
 440 {
 441     picture_t *p_outpic = NULL;
 442     int i_col, i_row, i_vout, i_plane;
 443     int pi_left_skip[VOUT_MAX_PLANES], pi_top_skip[VOUT_MAX_PLANES];
 444
 445     i_vout = 0;
 446
 447     for( i_row = 0; i_row < p_vout->p_sys->i_row; i_row++ )
 448     {
 449         for( i_col = 0; i_col < p_vout->p_sys->i_col; i_col++ )
 450         {
 451             for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 452             {
 453                 pi_left_skip[i_plane] = p_vout->p_sys->pp_vout[ i_vout ].i_left * p_pic->p[ i_plane ].i_pitch / p_vout->output.i_width;
 454                 pi_top_skip[i_plane] = (p_vout->p_sys->pp_vout[ i_vout ].i_top * p_pic->p[ i_plane ].i_lines / p_vout->output.i_height)*p_pic->p[i_plane].i_pitch;
 455             }
 456
 457             if( !p_vout->p_sys->pp_vout[ i_vout ].b_active )
 458             {
 459                 i_vout++;
 460                 continue;
 461             }
 462
 463             while( ( p_outpic =
 464                 vout_CreatePicture( p_vout->p_sys->pp_vout[ i_vout ].p_vout,
 465                                     0, 0, 0 )
 466                    ) == NULL )
 467             {
 468                 if( p_vout->b_die || p_vout->b_error )
 469                 {
 470                     vout_DestroyPicture(
 471                         p_vout->p_sys->pp_vout[ i_vout ].p_vout, p_outpic );
 472                     return;
 473                 }
 474
 475                 msleep( VOUT_OUTMEM_SLEEP );
 476             }
 477
 478             vout_DatePicture( p_vout->p_sys->pp_vout[ i_vout ].p_vout,
 479                               p_outpic, p_pic->date );
 480             vout_LinkPicture( p_vout->p_sys->pp_vout[ i_vout ].p_vout,
 481                               p_outpic );
 482
 483             for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 484             {
 485                 uint8_t *p_in, *p_in_end, *p_out;
 486                 int i_in_pitch = p_pic->p[i_plane].i_pitch;
 487                 int i_out_pitch = p_outpic->p[i_plane].i_pitch;
 488                 int i_copy_pitch = p_outpic->p[i_plane].i_visible_pitch;
 489
 490                 p_in = p_pic->p[i_plane].p_pixels
 491                         + pi_top_skip[i_plane] + pi_left_skip[i_plane];
 492
 493                 p_in_end = p_in + p_outpic->p[i_plane].i_visible_lines
 494                                    * p_pic->p[i_plane].i_pitch;
 495
 496                 p_out = p_outpic->p[i_plane].p_pixels;
 497
 498                 while( p_in < p_in_end )
 499                 {
 500                     p_vout->p_vlc->pf_memcpy( p_out, p_in, i_copy_pitch );
 501                     p_in += i_in_pitch;
 502                     p_out += i_out_pitch;
 503                 }
 504
 505 //                pi_left_skip[i_plane] += i_copy_pitch;
 506             }
 507
 508             vout_UnlinkPicture( p_vout->p_sys->pp_vout[ i_vout ].p_vout,
 509                                 p_outpic );
 510             vout_DisplayPicture( p_vout->p_sys->pp_vout[ i_vout ].p_vout,
 511                                  p_outpic );
 512
 513             i_vout++;
 514         }
 515
 516 /*         for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ ) */
 517 /*         { */
 518 /*             pi_top_skip[i_plane] += p_vout->p_sys->pp_vout[ i_vout ].i_height */
 519 /*                                      * p_pic->p[i_plane].i_visible_lines */
 520 /*                                      / p_vout->output.i_height */
 521 /*                                      * p_pic->p[i_plane].i_pitch; */
 522 /*         } */
 523     }
 524 }
 525
 526 /*****************************************************************************
 527  * RemoveAllVout: destroy all the child video output threads
 528  *****************************************************************************/
 529 static void RemoveAllVout( vout_thread_t *p_vout )
 530 {
 531     while( p_vout->p_sys->i_vout )
 532     {
 533          --p_vout->p_sys->i_vout;
 534          if( p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].b_active )
 535          {
 536              DEL_CALLBACKS(
 537                  p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].p_vout,
 538                  SendEvents );
 539              vlc_object_detach(
 540                  p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].p_vout );
 541              vout_Destroy(
 542                  p_vout->p_sys->pp_vout[ p_vout->p_sys->i_vout ].p_vout );
 543          }
 544     }
 545 }
 546
 547 /*****************************************************************************
 548  * SendEvents: forward mouse and keyboard events to the parent p_vout
 549  *****************************************************************************/
 550 static int SendEvents( vlc_object_t *p_this, char const *psz_var,
 551                        vlc_value_t oldval, vlc_value_t newval, void *_p_vout )
 552 {
 553     vout_thread_t *p_vout = (vout_thread_t *)_p_vout;
 554     int i_vout;
 555     vlc_value_t sentval = newval;
 556
 557     /* Find the video output index */
 558     for( i_vout = 0; i_vout < p_vout->p_sys->i_vout; i_vout++ )
 559     {
 560         if( p_this == (vlc_object_t *)p_vout->p_sys->pp_vout[ i_vout ].p_vout )
 561         {
 562             break;
 563         }
 564     }
 565
 566     if( i_vout == p_vout->p_sys->i_vout )
 567     {
 568         return VLC_EGENERIC;
 569     }
 570
 571     /* Translate the mouse coordinates */
 572     if( !strcmp( psz_var, "mouse-x" ) )
 573     {
 574         sentval.i_int += p_vout->output.i_width
 575                           * (i_vout % p_vout->p_sys->i_col)
 576                           / p_vout->p_sys->i_col;
 577     }
 578     else if( !strcmp( psz_var, "mouse-y" ) )
 579     {
 580         sentval.i_int += p_vout->output.i_height
 581                           * (i_vout / p_vout->p_sys->i_row)
 582                           / p_vout->p_sys->i_row;
 583     }
 584
 585     var_Set( p_vout, psz_var, sentval );
 586
 587     return VLC_SUCCESS;
 588 }
 589
 590 /*****************************************************************************
 591  * SendEventsToChild: forward events to the child/children vout
 592  *****************************************************************************/
 593 static int SendEventsToChild( vlc_object_t *p_this, char const *psz_var,
 594                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
 595 {
 596     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 597     int i_row, i_col, i_vout = 0;
 598
 599     for( i_row = 0; i_row < p_vout->p_sys->i_row; i_row++ )
 600     {
 601         for( i_col = 0; i_col < p_vout->p_sys->i_col; i_col++ )
 602         {
 603             var_Set( p_vout->p_sys->pp_vout[ i_vout ].p_vout, psz_var, newval);
 604             if( !strcmp( psz_var, "fullscreen" ) ) break;
 605             i_vout++;
 606         }
 607     }
 608
 609     return VLC_SUCCESS;
 610 }