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

   1 /*****************************************************************************
   2  * mosaic.c : Mosaic video plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2004-2005 VideoLAN (Centrale Réseaux) and its contributors
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea@via.ecp.fr>
   8  *          Christophe Massiot <massiot@via.ecp.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23 *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdlib.h>                                      /* malloc(), free() */
  29 #include <string.h>
  30 #include <math.h>
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc/vout.h>
  34
  35 #ifdef HAVE_LIMITS_H
  36 #   include <limits.h> /* INT_MAX */
  37 #endif
  38
  39 #include "vlc_filter.h"
  40 #include "vlc_image.h"
  41
  42 #include "mosaic.h"
  43
  44 #define BLANK_DELAY I64C(1000000)
  45
  46 /*****************************************************************************
  47  * Local prototypes
  48  *****************************************************************************/
  49 static int  CreateFilter    ( vlc_object_t * );
  50 static void DestroyFilter   ( vlc_object_t * );
  51
  52 static subpicture_t *Filter( filter_t *, mtime_t );
  53
  54 static int MosaicCallback( vlc_object_t *, char const *, vlc_value_t,
  55                            vlc_value_t, void * );
  56
  57 /*****************************************************************************
  58  * filter_sys_t : filter descriptor
  59  *****************************************************************************/
  60 struct filter_sys_t
  61 {
  62     vlc_mutex_t lock;
  63     vlc_mutex_t *p_lock;
  64
  65     image_handler_t *p_image;
  66     picture_t *p_pic;
  67
  68     int i_position; /* mosaic positioning method */
  69     vlc_bool_t b_ar; /* do we keep the aspect ratio ? */
  70     vlc_bool_t b_keep; /* do we keep the original picture format ? */
  71     int i_width, i_height; /* mosaic height and width */
  72     int i_cols, i_rows; /* mosaic rows and cols */
  73     int i_align; /* mosaic alignment in background video */
  74     int i_xoffset, i_yoffset; /* top left corner offset */
  75     int i_vborder, i_hborder; /* border width/height between miniatures */
  76     int i_alpha; /* subfilter alpha blending */
  77
  78     char **ppsz_order; /* list of picture-id */
  79     int i_order_length;
  80
  81     mtime_t i_delay;
  82 };
  83
  84 /*****************************************************************************
  85  * Module descriptor
  86  *****************************************************************************/
  87 #define ALPHA_TEXT N_("Alpha blending")
  88 #define ALPHA_LONGTEXT N_("Alpha blending (0 -> 255). Default is 255")
  89
  90 #define HEIGHT_TEXT N_("Height in pixels")
  91 #define WIDTH_TEXT N_("Width in pixels")
  92 #define XOFFSET_TEXT N_("Top left corner x coordinate")
  93 #define YOFFSET_TEXT N_("Top left corner y coordinate")
  94 #define VBORDER_TEXT N_("Vertical border width in pixels")
  95 #define HBORDER_TEXT N_("Horizontal border width in pixels")
  96 #define ALIGN_TEXT N_("Mosaic alignment")
  97
  98 #define POS_TEXT N_("Positioning method")
  99 #define POS_LONGTEXT N_("Positioning method. auto: automatically choose " \
 100         "the best number of rows and columns. fixed: use the user-defined " \
 101         "number of rows and columns.")
 102 #define ROWS_TEXT N_("Number of rows")
 103 #define COLS_TEXT N_("Number of columns")
 104 #define AR_TEXT N_("Keep aspect ratio when resizing")
 105 #define KEEP_TEXT N_("Keep original size")
 106
 107 #define ORDER_TEXT N_("Order as a comma separated list of picture-id(s)")
 108
 109 #define DELAY_TEXT N_("Delay")
 110 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
 111         "will be delayed accordingly (in milliseconds). For high " \
 112         "values you will need to raise file-caching and others.")
 113
 114 static int pi_pos_values[] = { 0, 1 };
 115 static char * ppsz_pos_descriptions[] =
 116 { N_("auto"), N_("fixed") };
 117
 118 static int pi_align_values[] = { 0, 1, 2, 4, 8, 5, 6, 9, 10 };
 119 static char *ppsz_align_descriptions[] =
 120      { N_("Center"), N_("Left"), N_("Right"), N_("Top"), N_("Bottom"),
 121      N_("Top-Left"), N_("Top-Right"), N_("Bottom-Left"), N_("Bottom-Right") };
 122
 123
 124 vlc_module_begin();
 125     set_description( N_("Mosaic video sub filter") );
 126     set_shortname( N_("Mosaic") );
 127     set_category( CAT_VIDEO );
 128     set_subcategory( SUBCAT_VIDEO_SUBPIC);
 129     set_capability( "sub filter", 0 );
 130     set_callbacks( CreateFilter, DestroyFilter );
 131
 132     add_integer( "mosaic-alpha", 255, NULL, ALPHA_TEXT, ALPHA_LONGTEXT, VLC_FALSE );
 133     add_integer( "mosaic-height", 100, NULL, HEIGHT_TEXT, HEIGHT_TEXT, VLC_FALSE );
 134     add_integer( "mosaic-width", 100, NULL, WIDTH_TEXT, WIDTH_TEXT, VLC_FALSE );
 135     add_integer( "mosaic-align", 5, NULL, ALIGN_TEXT, ALIGN_TEXT, VLC_TRUE);
 136         change_integer_list( pi_align_values, ppsz_align_descriptions, 0 );
 137     add_integer( "mosaic-xoffset", 0, NULL, XOFFSET_TEXT, XOFFSET_TEXT, VLC_TRUE );
 138     add_integer( "mosaic-yoffset", 0, NULL, YOFFSET_TEXT, YOFFSET_TEXT, VLC_TRUE );
 139     add_integer( "mosaic-vborder", 0, NULL, VBORDER_TEXT, VBORDER_TEXT, VLC_TRUE );
 140     add_integer( "mosaic-hborder", 0, NULL, HBORDER_TEXT, HBORDER_TEXT, VLC_TRUE );
 141
 142     add_integer( "mosaic-position", 0, NULL, POS_TEXT, POS_LONGTEXT, VLC_FALSE );
 143         change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
 144     add_integer( "mosaic-rows", 2, NULL, ROWS_TEXT, ROWS_TEXT, VLC_FALSE );
 145     add_integer( "mosaic-cols", 2, NULL, COLS_TEXT, COLS_TEXT, VLC_FALSE );
 146     add_bool( "mosaic-keep-aspect-ratio", 0, NULL, AR_TEXT, AR_TEXT, VLC_FALSE );
 147     add_bool( "mosaic-keep-picture", 0, NULL, KEEP_TEXT, KEEP_TEXT, VLC_FALSE );
 148     add_string( "mosaic-order", "", NULL, ORDER_TEXT, ORDER_TEXT, VLC_FALSE );
 149
 150     add_integer( "mosaic-delay", 0, NULL, DELAY_TEXT, DELAY_LONGTEXT,
 151                  VLC_FALSE );
 152
 153     var_Create( p_module->p_libvlc, "mosaic-lock", VLC_VAR_MUTEX );
 154 vlc_module_end();
 155
 156
 157 /*****************************************************************************
 158  * CreateFiler: allocate mosaic video filter
 159  *****************************************************************************/
 160 static int CreateFilter( vlc_object_t *p_this )
 161 {
 162     filter_t *p_filter = (filter_t *)p_this;
 163     filter_sys_t *p_sys;
 164     libvlc_t *p_libvlc = p_filter->p_libvlc;
 165     char *psz_order;
 166     int i_index;
 167     vlc_value_t val;
 168
 169     /* The mosaic thread is more important than the decoder threads */
 170     vlc_thread_set_priority( p_this, VLC_THREAD_PRIORITY_OUTPUT );
 171
 172     /* Allocate structure */
 173     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 174     if( p_sys == NULL )
 175     {
 176         msg_Err( p_filter, "out of memory" );
 177         return VLC_ENOMEM;
 178     }
 179
 180     p_filter->pf_sub_filter = Filter;
 181     p_sys->p_pic = NULL;
 182
 183     vlc_mutex_init( p_filter, &p_sys->lock );
 184     vlc_mutex_lock( &p_sys->lock );
 185
 186     var_Get( p_libvlc, "mosaic-lock", &val );
 187     p_sys->p_lock = val.p_address;
 188
 189 #define GET_VAR( name, min, max )                                           \
 190     p_sys->i_##name = __MIN( max, __MAX( min,                               \
 191                 var_CreateGetInteger( p_filter, "mosaic-" #name ) ) );      \
 192     var_Destroy( p_filter, "mosaic-" #name );                               \
 193     var_Create( p_libvlc, "mosaic-" #name, VLC_VAR_INTEGER );               \
 194     var_SetInteger( p_libvlc, "mosaic-" #name, p_sys->i_##name );           \
 195     var_AddCallback( p_libvlc, "mosaic-" #name, MosaicCallback, p_sys );
 196
 197     GET_VAR( width, 0, INT_MAX );
 198     GET_VAR( height, 0, INT_MAX );
 199     GET_VAR( xoffset, 0, INT_MAX );
 200     GET_VAR( yoffset, 0, INT_MAX );
 201
 202     p_sys->i_align = __MIN( 10, __MAX( 0,  var_CreateGetInteger( p_filter, "mosaic-align" ) ) );
 203     if( p_sys->i_align == 3 || p_sys->i_align == 7 )
 204         p_sys->i_align = 5;
 205     var_Destroy( p_filter, "mosaic-align" );
 206     var_Create( p_libvlc, "mosaic-align", VLC_VAR_INTEGER );
 207     var_SetInteger( p_libvlc, "mosaic-align", p_sys->i_align );
 208     var_AddCallback( p_libvlc, "mosaic-align", MosaicCallback, p_sys );
 209
 210     GET_VAR( vborder, 0, INT_MAX );
 211     GET_VAR( hborder, 0, INT_MAX );
 212     GET_VAR( rows, 1, INT_MAX );
 213     GET_VAR( cols, 1, INT_MAX );
 214     GET_VAR( alpha, 0, 255 );
 215     GET_VAR( position, 0, 1 );
 216     GET_VAR( delay, 100, INT_MAX );
 217     p_sys->i_delay *= 1000;
 218
 219     p_sys->b_ar = var_CreateGetBool( p_filter, "mosaic-keep-aspect-ratio" );
 220     var_Destroy( p_filter, "mosaic-keep-aspect-ratio" );
 221     var_Create( p_libvlc, "mosaic-keep-aspect-ratio", VLC_VAR_INTEGER );
 222     var_SetBool( p_libvlc, "mosaic-keep-aspect-ratio", p_sys->b_ar );
 223     var_AddCallback( p_libvlc, "mosaic-keep-aspect-ratio", MosaicCallback,
 224                      p_sys );
 225
 226     p_sys->b_keep = var_CreateGetBool( p_filter, "mosaic-keep-picture" );
 227     if ( !p_sys->b_keep )
 228     {
 229         p_sys->p_image = image_HandlerCreate( p_filter );
 230     }
 231
 232     p_sys->i_order_length = 0;
 233     p_sys->ppsz_order = NULL;
 234     psz_order = var_CreateGetString( p_filter, "mosaic-order" );
 235
 236     if( psz_order[0] != 0 )
 237     {
 238         char *psz_end = NULL;
 239         i_index = 0;
 240         do
 241         {
 242             psz_end = strchr( psz_order, ',' );
 243             i_index++;
 244             p_sys->ppsz_order = realloc( p_sys->ppsz_order,
 245                                          i_index * sizeof(char *) );
 246             p_sys->ppsz_order[i_index - 1] = strndup( psz_order,
 247                                            psz_end - psz_order );
 248             psz_order = psz_end+1;
 249         } while( NULL !=  psz_end );
 250         p_sys->i_order_length = i_index;
 251     }
 252
 253     vlc_mutex_unlock( &p_sys->lock );
 254
 255     return VLC_SUCCESS;
 256 }
 257
 258 /*****************************************************************************
 259  * DestroyFilter: destroy mosaic video filter
 260  *****************************************************************************/
 261 static void DestroyFilter( vlc_object_t *p_this )
 262 {
 263     filter_t *p_filter = (filter_t*)p_this;
 264     filter_sys_t *p_sys = p_filter->p_sys;
 265     libvlc_t *p_libvlc = p_filter->p_libvlc;
 266     int i_index;
 267
 268     vlc_mutex_lock( &p_sys->lock );
 269
 270     if( !p_sys->b_keep )
 271     {
 272         image_HandlerDelete( p_sys->p_image );
 273     }
 274
 275     if( p_sys->i_order_length )
 276     {
 277         for( i_index = 0; i_index < p_sys->i_order_length; i_index++ )
 278         {
 279             free( p_sys->ppsz_order[i_index] );
 280         }
 281         free( p_sys->ppsz_order );
 282     }
 283
 284     var_Destroy( p_libvlc, "mosaic-alpha" );
 285     var_Destroy( p_libvlc, "mosaic-height" );
 286     var_Destroy( p_libvlc, "mosaic-align" );
 287     var_Destroy( p_libvlc, "mosaic-width" );
 288     var_Destroy( p_libvlc, "mosaic-xoffset" );
 289     var_Destroy( p_libvlc, "mosaic-yoffset" );
 290     var_Destroy( p_libvlc, "mosaic-vborder" );
 291     var_Destroy( p_libvlc, "mosaic-hborder" );
 292     var_Destroy( p_libvlc, "mosaic-position" );
 293     var_Destroy( p_libvlc, "mosaic-rows" );
 294     var_Destroy( p_libvlc, "mosaic-cols" );
 295     var_Destroy( p_libvlc, "mosaic-keep-aspect-ratio" );
 296
 297     if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
 298     vlc_mutex_unlock( &p_sys->lock );
 299     vlc_mutex_destroy( &p_sys->lock );
 300     free( p_sys );
 301 }
 302
 303 /*****************************************************************************
 304  * MosaicReleasePicture : Hack to avoid picture duplication
 305  *****************************************************************************/
 306 static void MosaicReleasePicture( picture_t *p_picture )
 307 {
 308     picture_t *p_original_pic = (picture_t *)p_picture->p_sys;
 309
 310     p_original_pic->pf_release( p_original_pic );
 311 }
 312
 313 /*****************************************************************************
 314  * Filter
 315  *****************************************************************************/
 316 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
 317 {
 318     filter_sys_t *p_sys = p_filter->p_sys;
 319     bridge_t *p_bridge;
 320
 321     subpicture_t *p_spu;
 322
 323     int i_index, i_real_index, i_row, i_col;
 324     int i_greatest_real_index_used = p_sys->i_order_length - 1;
 325
 326     subpicture_region_t *p_region;
 327     subpicture_region_t *p_region_prev = NULL;
 328
 329     /* Allocate the subpicture internal data. */
 330     p_spu = p_filter->pf_sub_buffer_new( p_filter );
 331     if( !p_spu )
 332     {
 333         return NULL;
 334     }
 335
 336     /* Initialize subpicture */
 337     p_spu->i_channel = 0;
 338     p_spu->i_start  = date;
 339     p_spu->i_stop = 0;
 340     p_spu->b_ephemer = VLC_TRUE;
 341     p_spu->i_alpha = p_sys->i_alpha;
 342     p_spu->i_flags = p_sys->i_align;
 343     p_spu->b_absolute = VLC_FALSE;
 344
 345     vlc_mutex_lock( &p_sys->lock );
 346     vlc_mutex_lock( p_sys->p_lock );
 347
 348     p_bridge = GetBridge( p_filter );
 349     if ( p_bridge == NULL )
 350     {
 351         vlc_mutex_unlock( p_sys->p_lock );
 352         vlc_mutex_unlock( &p_sys->lock );
 353         return p_spu;
 354     }
 355
 356     if ( p_sys->i_position == 0 ) /* use automatic positioning */
 357     {
 358         int i_numpics = p_sys->i_order_length; /* keep slots and all */
 359         for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
 360         {
 361             bridged_es_t *p_es = p_bridge->pp_es[i_index];
 362             if ( !p_es->b_empty )
 363             {
 364                 i_numpics ++;
 365                 if( p_sys->i_order_length && p_es->psz_id != 0 )
 366                 {
 367                     /* We also want to leave slots for images given in
 368                      * mosaic-order that are not available in p_vout_picture */
 369                     int i;
 370                     for( i = 0; i < p_sys->i_order_length ; i++ )
 371                     {
 372                         if( !strcmp( p_sys->ppsz_order[i], p_es->psz_id ) )
 373                         {
 374                             i_numpics--;
 375                             break;
 376                         }
 377                     }
 378
 379                 }
 380             }
 381         }
 382         p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
 383         p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
 384                             i_numpics / p_sys->i_rows :
 385                             i_numpics / p_sys->i_rows + 1 );
 386     }
 387
 388     i_real_index = 0;
 389
 390     for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
 391     {
 392         bridged_es_t *p_es = p_bridge->pp_es[i_index];
 393         video_format_t fmt_in = {0}, fmt_out = {0};
 394         picture_t *p_converted;
 395
 396         if ( p_es->b_empty )
 397             continue;
 398
 399         while ( p_es->p_picture != NULL
 400                  && p_es->p_picture->date + p_sys->i_delay < date )
 401         {
 402             if ( p_es->p_picture->p_next != NULL )
 403             {
 404                 picture_t *p_next = p_es->p_picture->p_next;
 405                 p_es->p_picture->pf_release( p_es->p_picture );
 406                 p_es->p_picture = p_next;
 407             }
 408             else if ( p_es->p_picture->date + p_sys->i_delay + BLANK_DELAY <
 409                         date )
 410             {
 411                 /* Display blank */
 412                 p_es->p_picture->pf_release( p_es->p_picture );
 413                 p_es->p_picture = NULL;
 414                 p_es->pp_last = &p_es->p_picture;
 415                 break;
 416             }
 417             else
 418             {
 419                 msg_Dbg( p_filter, "too late picture for %s (" I64Fd ")",
 420                          p_es->psz_id,
 421                          date - p_es->p_picture->date - p_sys->i_delay );
 422                 break;
 423             }
 424         }
 425
 426         if ( p_es->p_picture == NULL )
 427             continue;
 428
 429         if ( p_sys->i_order_length == 0 )
 430         {
 431             i_real_index++;
 432         }
 433         else
 434         {
 435             int i;
 436             for ( i = 0; i <= p_sys->i_order_length; i++ )
 437             {
 438                 if ( i == p_sys->i_order_length ) break;
 439                 if ( strcmp( p_es->psz_id, p_sys->ppsz_order[i] ) == 0 )
 440                 {
 441                     i_real_index = i;
 442                     break;
 443                 }
 444             }
 445             if ( i == p_sys->i_order_length )
 446                 i_real_index = ++i_greatest_real_index_used;
 447         }
 448         i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
 449         i_col = i_real_index % p_sys->i_cols ;
 450
 451         if ( !p_sys->b_keep )
 452         {
 453             /* Convert the images */
 454             fmt_in.i_chroma = p_es->p_picture->format.i_chroma;
 455             fmt_in.i_height = p_es->p_picture->format.i_height;
 456             fmt_in.i_width = p_es->p_picture->format.i_width;
 457
 458             fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
 459             fmt_out.i_width = fmt_in.i_width *
 460                 ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 461                   / p_sys->i_cols ) / fmt_in.i_width;
 462             fmt_out.i_height = fmt_in.i_height *
 463                 ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 464                   / p_sys->i_rows ) / fmt_in.i_height;
 465             if( p_sys->b_ar ) /* keep aspect ratio */
 466             {
 467                 if( (float)fmt_out.i_width / (float)fmt_out.i_height
 468                       > (float)fmt_in.i_width / (float)fmt_in.i_height )
 469                 {
 470                     fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
 471                                          / fmt_in.i_height;
 472                 }
 473                 else
 474                 {
 475                     fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
 476                                         / fmt_in.i_width;
 477                 }
 478              }
 479
 480             fmt_out.i_visible_width = fmt_out.i_width;
 481             fmt_out.i_visible_height = fmt_out.i_height;
 482
 483             p_converted = image_Convert( p_sys->p_image, p_es->p_picture,
 484                                          &fmt_in, &fmt_out );
 485             if( !p_converted )
 486             {
 487                 msg_Warn( p_filter,
 488                            "image resizing and chroma conversion failed" );
 489                 continue;
 490             }
 491         }
 492         else
 493         {
 494             p_converted = p_es->p_picture;
 495             p_converted->i_refcount++;
 496             fmt_in.i_width = fmt_out.i_width = p_converted->format.i_width;
 497             fmt_in.i_height = fmt_out.i_height = p_converted->format.i_height;
 498             fmt_in.i_chroma = fmt_out.i_chroma = p_converted->format.i_chroma;
 499             fmt_out.i_visible_width = fmt_out.i_width;
 500             fmt_out.i_visible_height = fmt_out.i_height;
 501         }
 502
 503         p_region = p_spu->pf_make_region( VLC_OBJECT(p_filter), &fmt_out,
 504                                           p_converted );
 505         if( !p_region )
 506         {
 507             msg_Err( p_filter, "cannot allocate SPU region" );
 508             p_filter->pf_sub_buffer_del( p_filter, p_spu );
 509             vlc_mutex_unlock( &p_sys->lock );
 510             vlc_mutex_unlock( p_sys->p_lock );
 511             return p_spu;
 512         }
 513
 514         /* HACK ALERT : let's fix the pointers to avoid picture duplication.
 515          * This is necessary because p_region->picture is not a pointer
 516          * as it ought to be. */
 517         if( !p_sys->b_keep )
 518         {
 519             free( p_converted );
 520         }
 521         else
 522         {
 523             /* Keep a pointer to the original picture (and its refcount...). */
 524             p_region->picture.p_sys = (picture_sys_t *)p_converted;
 525             p_region->picture.pf_release = MosaicReleasePicture;
 526         }
 527
 528         if( p_sys->b_ar || p_sys->b_keep ) /* keep aspect ratio */
 529         {
 530             /* center the video in the dedicated rectangle */
 531             p_region->i_x = p_sys->i_xoffset
 532                         + i_col * ( p_sys->i_width / p_sys->i_cols )
 533                         + ( i_col * p_sys->i_vborder ) / p_sys->i_cols
 534                         + ( ( ( p_sys->i_width
 535                                  - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 536                             / p_sys->i_cols ) - fmt_out.i_width ) / 2;
 537             p_region->i_y = p_sys->i_yoffset
 538                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 539                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows
 540                         + ( ( ( p_sys->i_height
 541                                  - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 542                             / p_sys->i_rows ) - fmt_out.i_height ) / 2;
 543         }
 544         else
 545         {
 546             /* we don't have to center the video since it takes the
 547             whole rectangle area */
 548             p_region->i_x = p_sys->i_xoffset
 549                             + i_col * ( p_sys->i_width / p_sys->i_cols )
 550                             + ( i_col * p_sys->i_vborder ) / p_sys->i_cols;
 551             p_region->i_y = p_sys->i_yoffset
 552                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 553                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows;
 554         }
 555
 556         if( p_region_prev == NULL )
 557         {
 558             p_spu->p_region = p_region;
 559         }
 560         else
 561         {
 562             p_region_prev->p_next = p_region;
 563         }
 564
 565         p_region_prev = p_region;
 566     }
 567
 568     vlc_mutex_unlock( p_sys->p_lock );
 569     vlc_mutex_unlock( &p_sys->lock );
 570
 571     return p_spu;
 572 }
 573
 574 /*****************************************************************************
 575 * Callback to update params on the fly
 576 *****************************************************************************/
 577 static int MosaicCallback( vlc_object_t *p_this, char const *psz_var,
 578                             vlc_value_t oldval, vlc_value_t newval,
 579                             void *p_data )
 580 {
 581     filter_sys_t *p_sys = (filter_sys_t *) p_data;
 582     if( !strcmp( psz_var, "mosaic-alpha" ) )
 583     {
 584         vlc_mutex_lock( &p_sys->lock );
 585         msg_Dbg( p_this, "Changing alpha from %d/255 to %d/255",
 586                          p_sys->i_alpha, newval.i_int);
 587         p_sys->i_alpha = __MIN( __MAX( newval.i_int, 0 ), 255 );
 588         vlc_mutex_unlock( &p_sys->lock );
 589     }
 590     else if( !strcmp( psz_var, "mosaic-height" ) )
 591     {
 592         vlc_mutex_lock( &p_sys->lock );
 593         msg_Dbg( p_this, "Changing height from %dpx to %dpx",
 594                           p_sys->i_height, newval.i_int );
 595         p_sys->i_height = __MAX( newval.i_int, 0 );
 596         vlc_mutex_unlock( &p_sys->lock );
 597     }
 598     else if( !strcmp( psz_var, "mosaic-width" ) )
 599     {
 600         vlc_mutex_lock( &p_sys->lock );
 601         msg_Dbg( p_this, "Changing width from %dpx to %dpx",
 602                          p_sys->i_width, newval.i_int );
 603         p_sys->i_width = __MAX( newval.i_int, 0 );
 604         vlc_mutex_unlock( &p_sys->lock );
 605     }
 606     else if( !strcmp( psz_var, "mosaic-xoffset" ) )
 607     {
 608         vlc_mutex_lock( &p_sys->lock );
 609         msg_Dbg( p_this, "Changing x offset from %dpx to %dpx",
 610                          p_sys->i_xoffset, newval.i_int );
 611         p_sys->i_xoffset = __MAX( newval.i_int, 0 );
 612         vlc_mutex_unlock( &p_sys->lock );
 613     }
 614     else if( !strcmp( psz_var, "mosaic-yoffset" ) )
 615     {
 616         vlc_mutex_lock( &p_sys->lock );
 617         msg_Dbg( p_this, "Changing y offset from %dpx to %dpx",
 618                          p_sys->i_yoffset, newval.i_int );
 619         p_sys->i_yoffset = __MAX( newval.i_int, 0 );
 620         vlc_mutex_unlock( &p_sys->lock );
 621     }
 622     else if( !strcmp( psz_var, "mosaic-align" ) )
 623     {
 624         int i_old = 0, i_new = 0;
 625         vlc_mutex_lock( &p_sys->lock );
 626         newval.i_int = __MIN( __MAX( newval.i_int, 0 ), 10 );
 627         if( newval.i_int == 3 || newval.i_int == 7 )
 628             newval.i_int = 5;
 629         while( pi_align_values[i_old] != p_sys->i_align ) i_old++;
 630         while( pi_align_values[i_new] != newval.i_int ) i_new++;
 631         msg_Dbg( p_this, "Changing alignment from %d (%s) to %d (%s)",
 632                      p_sys->i_align, ppsz_align_descriptions[i_old],
 633                      newval.i_int, ppsz_align_descriptions[i_new] );
 634         p_sys->i_align = newval.i_int;
 635         vlc_mutex_unlock( &p_sys->lock );
 636     }
 637     else if( !strcmp( psz_var, "mosaic-vborder" ) )
 638     {
 639         vlc_mutex_lock( &p_sys->lock );
 640         msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
 641                          p_sys->i_vborder, newval.i_int );
 642         p_sys->i_vborder = __MAX( newval.i_int, 0 );
 643         vlc_mutex_unlock( &p_sys->lock );
 644     }
 645     else if( !strcmp( psz_var, "mosaic-hborder" ) )
 646     {
 647         vlc_mutex_lock( &p_sys->lock );
 648         msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
 649                          p_sys->i_vborder, newval.i_int );
 650         p_sys->i_hborder = __MAX( newval.i_int, 0 );
 651         vlc_mutex_unlock( &p_sys->lock );
 652     }
 653     else if( !strcmp( psz_var, "mosaic-position" ) )
 654     {
 655         if( newval.i_int > 1 || newval.i_int < 0 )
 656         {
 657             msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
 658         }
 659         else
 660         {
 661             vlc_mutex_lock( &p_sys->lock );
 662             msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
 663                              p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
 664                              newval.i_int, ppsz_pos_descriptions[newval.i_int]);
 665             p_sys->i_position = newval.i_int;
 666             vlc_mutex_unlock( &p_sys->lock );
 667         }
 668     }
 669     else if( !strcmp( psz_var, "mosaic-rows" ) )
 670     {
 671         vlc_mutex_lock( &p_sys->lock );
 672         msg_Dbg( p_this, "Changing number of rows from %d to %d",
 673                          p_sys->i_rows, newval.i_int );
 674         p_sys->i_rows = __MAX( newval.i_int, 1 );
 675         vlc_mutex_unlock( &p_sys->lock );
 676     }
 677     else if( !strcmp( psz_var, "mosaic-cols" ) )
 678     {
 679         vlc_mutex_lock( &p_sys->lock );
 680         msg_Dbg( p_this, "Changing number of columns from %d to %d",
 681                          p_sys->i_cols, newval.i_int );
 682         p_sys->i_cols = __MAX( newval.i_int, 1 );
 683         vlc_mutex_unlock( &p_sys->lock );
 684     }
 685     else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
 686     {
 687         vlc_mutex_lock( &p_sys->lock );
 688         if( newval.i_int )
 689         {
 690             msg_Dbg( p_this, "Keep aspect ratio" );
 691             p_sys->b_ar = 1;
 692         }
 693         else
 694         {
 695             msg_Dbg( p_this, "Don't keep aspect ratio" );
 696             p_sys->b_ar = 0;
 697         }
 698         vlc_mutex_unlock( &p_sys->lock );
 699     }
 700     return VLC_SUCCESS;
 701 }