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
   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_capability( "sub filter", 0 );
 128     set_callbacks( CreateFilter, DestroyFilter );
 129
 130     add_integer( "mosaic-alpha", 255, NULL, ALPHA_TEXT, ALPHA_LONGTEXT, VLC_FALSE );
 131     add_integer( "mosaic-height", 100, NULL, HEIGHT_TEXT, HEIGHT_TEXT, VLC_FALSE );
 132     add_integer( "mosaic-width", 100, NULL, WIDTH_TEXT, WIDTH_TEXT, VLC_FALSE );
 133     add_integer( "mosaic-align", 5, NULL, ALIGN_TEXT, ALIGN_TEXT, VLC_TRUE);
 134         change_integer_list( pi_align_values, ppsz_align_descriptions, 0 );
 135     add_integer( "mosaic-xoffset", 0, NULL, XOFFSET_TEXT, XOFFSET_TEXT, VLC_TRUE );
 136     add_integer( "mosaic-yoffset", 0, NULL, YOFFSET_TEXT, YOFFSET_TEXT, VLC_TRUE );
 137     add_integer( "mosaic-vborder", 0, NULL, VBORDER_TEXT, VBORDER_TEXT, VLC_TRUE );
 138     add_integer( "mosaic-hborder", 0, NULL, HBORDER_TEXT, HBORDER_TEXT, VLC_TRUE );
 139
 140     add_integer( "mosaic-position", 0, NULL, POS_TEXT, POS_LONGTEXT, VLC_FALSE );
 141         change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
 142     add_integer( "mosaic-rows", 2, NULL, ROWS_TEXT, ROWS_TEXT, VLC_FALSE );
 143     add_integer( "mosaic-cols", 2, NULL, COLS_TEXT, COLS_TEXT, VLC_FALSE );
 144     add_bool( "mosaic-keep-aspect-ratio", 0, NULL, AR_TEXT, AR_TEXT, VLC_FALSE );
 145     add_bool( "mosaic-keep-picture", 0, NULL, KEEP_TEXT, KEEP_TEXT, VLC_FALSE );
 146     add_string( "mosaic-order", "", NULL, ORDER_TEXT, ORDER_TEXT, VLC_FALSE );
 147
 148     add_integer( "mosaic-delay", 0, NULL, DELAY_TEXT, DELAY_LONGTEXT,
 149                  VLC_FALSE );
 150
 151     var_Create( p_module->p_libvlc, "mosaic-lock", VLC_VAR_MUTEX );
 152 vlc_module_end();
 153
 154
 155 /*****************************************************************************
 156  * CreateFiler: allocate mosaic video filter
 157  *****************************************************************************/
 158 static int CreateFilter( vlc_object_t *p_this )
 159 {
 160     filter_t *p_filter = (filter_t *)p_this;
 161     filter_sys_t *p_sys;
 162     libvlc_t *p_libvlc = p_filter->p_libvlc;
 163     char *psz_order;
 164     int i_index;
 165     vlc_value_t val;
 166
 167     /* The mosaic thread is more important than the decoder threads */
 168     vlc_thread_set_priority( p_this, VLC_THREAD_PRIORITY_OUTPUT );
 169
 170     /* Allocate structure */
 171     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 172     if( p_sys == NULL )
 173     {
 174         msg_Err( p_filter, "out of memory" );
 175         return VLC_ENOMEM;
 176     }
 177
 178     p_filter->pf_sub_filter = Filter;
 179     p_sys->p_pic = NULL;
 180
 181     vlc_mutex_init( p_filter, &p_sys->lock );
 182     vlc_mutex_lock( &p_sys->lock );
 183
 184     var_Get( p_libvlc, "mosaic-lock", &val );
 185     p_sys->p_lock = val.p_address;
 186
 187 #define GET_VAR( name, min, max )                                           \
 188     p_sys->i_##name = __MIN( max, __MAX( min,                               \
 189                 var_CreateGetInteger( p_filter, "mosaic-" #name ) ) );      \
 190     var_Destroy( p_filter, "mosaic-" #name );                               \
 191     var_Create( p_libvlc, "mosaic-" #name, VLC_VAR_INTEGER );               \
 192     var_SetInteger( p_libvlc, "mosaic-" #name, p_sys->i_##name );           \
 193     var_AddCallback( p_libvlc, "mosaic-" #name, MosaicCallback, p_sys );
 194
 195     GET_VAR( width, 0, INT_MAX );
 196     GET_VAR( height, 0, INT_MAX );
 197     GET_VAR( xoffset, 0, INT_MAX );
 198     GET_VAR( yoffset, 0, INT_MAX );
 199
 200     p_sys->i_align = __MIN( 10, __MAX( 0,  var_CreateGetInteger( p_filter, "mosaic-align" ) ) );
 201     if( p_sys->i_align == 3 || p_sys->i_align == 7 )
 202         p_sys->i_align = 5;
 203     var_Destroy( p_filter, "mosaic-align" );
 204     var_Create( p_libvlc, "mosaic-align", VLC_VAR_INTEGER );
 205     var_SetInteger( p_libvlc, "mosaic-align", p_sys->i_align );
 206     var_AddCallback( p_libvlc, "mosaic-align", MosaicCallback, p_sys );
 207
 208     GET_VAR( vborder, 0, INT_MAX );
 209     GET_VAR( hborder, 0, INT_MAX );
 210     GET_VAR( rows, 1, INT_MAX );
 211     GET_VAR( cols, 1, INT_MAX );
 212     GET_VAR( alpha, 0, 255 );
 213     GET_VAR( position, 0, 1 );
 214     GET_VAR( delay, 100, INT_MAX );
 215     p_sys->i_delay *= 1000;
 216
 217     p_sys->b_ar = var_CreateGetBool( p_filter, "mosaic-keep-aspect-ratio" );
 218     var_Destroy( p_filter, "mosaic-keep-aspect-ratio" );
 219     var_Create( p_libvlc, "mosaic-keep-aspect-ratio", VLC_VAR_INTEGER );
 220     var_SetBool( p_libvlc, "mosaic-keep-aspect-ratio", p_sys->b_ar );
 221     var_AddCallback( p_libvlc, "mosaic-keep-aspect-ratio", MosaicCallback,
 222                      p_sys );
 223
 224     p_sys->b_keep = var_CreateGetBool( p_filter, "mosaic-keep-picture" );
 225     if ( !p_sys->b_keep )
 226     {
 227         p_sys->p_image = image_HandlerCreate( p_filter );
 228     }
 229
 230     p_sys->i_order_length = 0;
 231     p_sys->ppsz_order = NULL;
 232     psz_order = var_CreateGetString( p_filter, "mosaic-order" );
 233
 234     if( psz_order[0] != 0 )
 235     {
 236         char *psz_end = NULL;
 237         i_index = 0;
 238         do
 239         {
 240             psz_end = strchr( psz_order, ',' );
 241             i_index++;
 242             p_sys->ppsz_order = realloc( p_sys->ppsz_order,
 243                                          i_index * sizeof(char *) );
 244             p_sys->ppsz_order[i_index - 1] = strndup( psz_order,
 245                                            psz_end - psz_order );
 246             psz_order = psz_end+1;
 247         } while( NULL !=  psz_end );
 248         p_sys->i_order_length = i_index;
 249     }
 250
 251     vlc_mutex_unlock( &p_sys->lock );
 252
 253     return VLC_SUCCESS;
 254 }
 255
 256 /*****************************************************************************
 257  * DestroyFilter: destroy mosaic video filter
 258  *****************************************************************************/
 259 static void DestroyFilter( vlc_object_t *p_this )
 260 {
 261     filter_t *p_filter = (filter_t*)p_this;
 262     filter_sys_t *p_sys = p_filter->p_sys;
 263     libvlc_t *p_libvlc = p_filter->p_libvlc;
 264     int i_index;
 265
 266     vlc_mutex_lock( &p_sys->lock );
 267
 268     if( !p_sys->b_keep )
 269     {
 270         image_HandlerDelete( p_sys->p_image );
 271     }
 272
 273     if( p_sys->i_order_length )
 274     {
 275         for( i_index = 0; i_index < p_sys->i_order_length; i_index++ )
 276         {
 277             free( p_sys->ppsz_order[i_index] );
 278         }
 279         free( p_sys->ppsz_order );
 280     }
 281
 282     var_Destroy( p_libvlc, "mosaic-alpha" );
 283     var_Destroy( p_libvlc, "mosaic-height" );
 284     var_Destroy( p_libvlc, "mosaic-align" );
 285     var_Destroy( p_libvlc, "mosaic-width" );
 286     var_Destroy( p_libvlc, "mosaic-xoffset" );
 287     var_Destroy( p_libvlc, "mosaic-yoffset" );
 288     var_Destroy( p_libvlc, "mosaic-vborder" );
 289     var_Destroy( p_libvlc, "mosaic-hborder" );
 290     var_Destroy( p_libvlc, "mosaic-position" );
 291     var_Destroy( p_libvlc, "mosaic-rows" );
 292     var_Destroy( p_libvlc, "mosaic-cols" );
 293     var_Destroy( p_libvlc, "mosaic-keep-aspect-ratio" );
 294
 295     if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
 296     vlc_mutex_unlock( &p_sys->lock );
 297     vlc_mutex_destroy( &p_sys->lock );
 298     free( p_sys );
 299 }
 300
 301 /*****************************************************************************
 302  * MosaicReleasePicture : Hack to avoid picture duplication
 303  *****************************************************************************/
 304 static void MosaicReleasePicture( picture_t *p_picture )
 305 {
 306     picture_t *p_original_pic = (picture_t *)p_picture->p_sys;
 307
 308     p_original_pic->pf_release( p_original_pic );
 309 }
 310
 311 /*****************************************************************************
 312  * Filter
 313  *****************************************************************************/
 314 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
 315 {
 316     filter_sys_t *p_sys = p_filter->p_sys;
 317     bridge_t *p_bridge;
 318
 319     subpicture_t *p_spu;
 320
 321     int i_index, i_real_index, i_row, i_col;
 322     int i_greatest_real_index_used = p_sys->i_order_length - 1;
 323
 324     subpicture_region_t *p_region;
 325     subpicture_region_t *p_region_prev = NULL;
 326
 327     /* Allocate the subpicture internal data. */
 328     p_spu = p_filter->pf_sub_buffer_new( p_filter );
 329     if( !p_spu )
 330     {
 331         return NULL;
 332     }
 333
 334     /* Initialize subpicture */
 335     p_spu->i_channel = 0;
 336     p_spu->i_start  = date;
 337     p_spu->i_stop = 0;
 338     p_spu->b_ephemer = VLC_TRUE;
 339     p_spu->i_alpha = p_sys->i_alpha;
 340     p_spu->i_flags = p_sys->i_align;
 341     p_spu->b_absolute = VLC_FALSE;
 342
 343     vlc_mutex_lock( &p_sys->lock );
 344     vlc_mutex_lock( p_sys->p_lock );
 345
 346     p_bridge = GetBridge( p_filter );
 347     if ( p_bridge == NULL )
 348     {
 349         vlc_mutex_unlock( p_sys->p_lock );
 350         vlc_mutex_unlock( &p_sys->lock );
 351         return p_spu;
 352     }
 353
 354     if ( p_sys->i_position == 0 ) /* use automatic positioning */
 355     {
 356         int i_numpics = p_sys->i_order_length; /* keep slots and all */
 357         for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
 358         {
 359             bridged_es_t *p_es = p_bridge->pp_es[i_index];
 360             if ( !p_es->b_empty )
 361             {
 362                 i_numpics ++;
 363                 if( p_sys->i_order_length && p_es->psz_id != 0 )
 364                 {
 365                     /* We also want to leave slots for images given in
 366                      * mosaic-order that are not available in p_vout_picture */
 367                     int i;
 368                     for( i = 0; i < p_sys->i_order_length ; i++ )
 369                     {
 370                         if( !strcmp( p_sys->ppsz_order[i], p_es->psz_id ) )
 371                         {
 372                             i_numpics--;
 373                             break;
 374                         }
 375                     }
 376
 377                 }
 378             }
 379         }
 380         p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
 381         p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
 382                             i_numpics / p_sys->i_rows :
 383                             i_numpics / p_sys->i_rows + 1 );
 384     }
 385
 386     i_real_index = 0;
 387
 388     for ( i_index = 0; i_index < p_bridge->i_es_num; i_index++ )
 389     {
 390         bridged_es_t *p_es = p_bridge->pp_es[i_index];
 391         video_format_t fmt_in = {0}, fmt_out = {0};
 392         picture_t *p_converted;
 393
 394         if ( p_es->b_empty )
 395             continue;
 396
 397         while ( p_es->p_picture != NULL
 398                  && p_es->p_picture->date + p_sys->i_delay < date )
 399         {
 400             if ( p_es->p_picture->p_next != NULL )
 401             {
 402                 picture_t *p_next = p_es->p_picture->p_next;
 403                 p_es->p_picture->pf_release( p_es->p_picture );
 404                 p_es->p_picture = p_next;
 405             }
 406             else if ( p_es->p_picture->date + p_sys->i_delay + BLANK_DELAY <
 407                         date )
 408             {
 409                 /* Display blank */
 410                 p_es->p_picture->pf_release( p_es->p_picture );
 411                 p_es->p_picture = NULL;
 412                 p_es->pp_last = &p_es->p_picture;
 413                 break;
 414             }
 415             else
 416             {
 417                 msg_Dbg( p_filter, "too late picture for %s (" I64Fd ")",
 418                          p_es->psz_id,
 419                          date - p_es->p_picture->date - p_sys->i_delay );
 420                 break;
 421             }
 422         }
 423
 424         if ( p_es->p_picture == NULL )
 425             continue;
 426
 427         if ( p_sys->i_order_length == 0 )
 428         {
 429             i_real_index++;
 430         }
 431         else
 432         {
 433             int i;
 434             for ( i = 0; i <= p_sys->i_order_length; i++ )
 435             {
 436                 if ( i == p_sys->i_order_length ) break;
 437                 if ( strcmp( p_es->psz_id, p_sys->ppsz_order[i] ) == 0 )
 438                 {
 439                     i_real_index = i;
 440                     break;
 441                 }
 442             }
 443             if ( i == p_sys->i_order_length )
 444                 i_real_index = ++i_greatest_real_index_used;
 445         }
 446         i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
 447         i_col = i_real_index % p_sys->i_cols ;
 448
 449         if ( !p_sys->b_keep )
 450         {
 451             /* Convert the images */
 452             fmt_in.i_chroma = p_es->p_picture->format.i_chroma;
 453             fmt_in.i_height = p_es->p_picture->format.i_height;
 454             fmt_in.i_width = p_es->p_picture->format.i_width;
 455
 456             fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
 457             fmt_out.i_width = fmt_in.i_width *
 458                 ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 459                   / p_sys->i_cols ) / fmt_in.i_width;
 460             fmt_out.i_height = fmt_in.i_height *
 461                 ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 462                   / p_sys->i_rows ) / fmt_in.i_height;
 463             if( p_sys->b_ar ) /* keep aspect ratio */
 464             {
 465                 if( (float)fmt_out.i_width / (float)fmt_out.i_height
 466                       > (float)fmt_in.i_width / (float)fmt_in.i_height )
 467                 {
 468                     fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
 469                                          / fmt_in.i_height;
 470                 }
 471                 else
 472                 {
 473                     fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
 474                                         / fmt_in.i_width;
 475                 }
 476              }
 477
 478             fmt_out.i_visible_width = fmt_out.i_width;
 479             fmt_out.i_visible_height = fmt_out.i_height;
 480
 481             p_converted = image_Convert( p_sys->p_image, p_es->p_picture,
 482                                          &fmt_in, &fmt_out );
 483             if( !p_converted )
 484             {
 485                 msg_Warn( p_filter,
 486                            "image resizing and chroma conversion failed" );
 487                 continue;
 488             }
 489         }
 490         else
 491         {
 492             p_converted = p_es->p_picture;
 493             p_converted->i_refcount++;
 494             fmt_in.i_width = fmt_out.i_width = p_converted->format.i_width;
 495             fmt_in.i_height = fmt_out.i_height = p_converted->format.i_height;
 496             fmt_in.i_chroma = fmt_out.i_chroma = p_converted->format.i_chroma;
 497             fmt_out.i_visible_width = fmt_out.i_width;
 498             fmt_out.i_visible_height = fmt_out.i_height;
 499         }
 500
 501         p_region = p_spu->pf_make_region( VLC_OBJECT(p_filter), &fmt_out,
 502                                           p_converted );
 503         if( !p_region )
 504         {
 505             msg_Err( p_filter, "cannot allocate SPU region" );
 506             p_filter->pf_sub_buffer_del( p_filter, p_spu );
 507             vlc_mutex_unlock( &p_sys->lock );
 508             vlc_mutex_unlock( p_sys->p_lock );
 509             return p_spu;
 510         }
 511
 512         /* HACK ALERT : let's fix the pointers to avoid picture duplication.
 513          * This is necessary because p_region->picture is not a pointer
 514          * as it ought to be. */
 515         if( !p_sys->b_keep )
 516         {
 517             free( p_converted );
 518         }
 519         else
 520         {
 521             /* Keep a pointer to the original picture (and its refcount...). */
 522             p_region->picture.p_sys = (picture_sys_t *)p_converted;
 523             p_region->picture.pf_release = MosaicReleasePicture;
 524         }
 525
 526         if( p_sys->b_ar || p_sys->b_keep ) /* keep aspect ratio */
 527         {
 528             /* center the video in the dedicated rectangle */
 529             p_region->i_x = p_sys->i_xoffset
 530                         + i_col * ( p_sys->i_width / p_sys->i_cols )
 531                         + ( i_col * p_sys->i_vborder ) / p_sys->i_cols
 532                         + ( ( ( p_sys->i_width
 533                                  - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 534                             / p_sys->i_cols ) - fmt_out.i_width ) / 2;
 535             p_region->i_y = p_sys->i_yoffset
 536                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 537                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows
 538                         + ( ( ( p_sys->i_height
 539                                  - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 540                             / p_sys->i_rows ) - fmt_out.i_height ) / 2;
 541         }
 542         else
 543         {
 544             /* we don't have to center the video since it takes the
 545             whole rectangle area */
 546             p_region->i_x = p_sys->i_xoffset
 547                             + i_col * ( p_sys->i_width / p_sys->i_cols )
 548                             + ( i_col * p_sys->i_vborder ) / p_sys->i_cols;
 549             p_region->i_y = p_sys->i_yoffset
 550                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 551                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows;
 552         }
 553
 554         if( p_region_prev == NULL )
 555         {
 556             p_spu->p_region = p_region;
 557         }
 558         else
 559         {
 560             p_region_prev->p_next = p_region;
 561         }
 562
 563         p_region_prev = p_region;
 564     }
 565
 566     vlc_mutex_unlock( p_sys->p_lock );
 567     vlc_mutex_unlock( &p_sys->lock );
 568
 569     return p_spu;
 570 }
 571
 572 /*****************************************************************************
 573 * Callback to update params on the fly
 574 *****************************************************************************/
 575 static int MosaicCallback( vlc_object_t *p_this, char const *psz_var,
 576                             vlc_value_t oldval, vlc_value_t newval,
 577                             void *p_data )
 578 {
 579     filter_sys_t *p_sys = (filter_sys_t *) p_data;
 580     if( !strcmp( psz_var, "mosaic-alpha" ) )
 581     {
 582         vlc_mutex_lock( &p_sys->lock );
 583         msg_Dbg( p_this, "Changing alpha from %d/255 to %d/255",
 584                          p_sys->i_alpha, newval.i_int);
 585         p_sys->i_alpha = __MIN( __MAX( newval.i_int, 0 ), 255 );
 586         vlc_mutex_unlock( &p_sys->lock );
 587     }
 588     else if( !strcmp( psz_var, "mosaic-height" ) )
 589     {
 590         vlc_mutex_lock( &p_sys->lock );
 591         msg_Dbg( p_this, "Changing height from %dpx to %dpx",
 592                           p_sys->i_height, newval.i_int );
 593         p_sys->i_height = __MAX( newval.i_int, 0 );
 594         vlc_mutex_unlock( &p_sys->lock );
 595     }
 596     else if( !strcmp( psz_var, "mosaic-width" ) )
 597     {
 598         vlc_mutex_lock( &p_sys->lock );
 599         msg_Dbg( p_this, "Changing width from %dpx to %dpx",
 600                          p_sys->i_width, newval.i_int );
 601         p_sys->i_width = __MAX( newval.i_int, 0 );
 602         vlc_mutex_unlock( &p_sys->lock );
 603     }
 604     else if( !strcmp( psz_var, "mosaic-xoffset" ) )
 605     {
 606         vlc_mutex_lock( &p_sys->lock );
 607         msg_Dbg( p_this, "Changing x offset from %dpx to %dpx",
 608                          p_sys->i_xoffset, newval.i_int );
 609         p_sys->i_xoffset = __MAX( newval.i_int, 0 );
 610         vlc_mutex_unlock( &p_sys->lock );
 611     }
 612     else if( !strcmp( psz_var, "mosaic-yoffset" ) )
 613     {
 614         vlc_mutex_lock( &p_sys->lock );
 615         msg_Dbg( p_this, "Changing y offset from %dpx to %dpx",
 616                          p_sys->i_yoffset, newval.i_int );
 617         p_sys->i_yoffset = __MAX( newval.i_int, 0 );
 618         vlc_mutex_unlock( &p_sys->lock );
 619     }
 620     else if( !strcmp( psz_var, "mosaic-align" ) )
 621     {
 622         int i_old = 0, i_new = 0;
 623         vlc_mutex_lock( &p_sys->lock );
 624         newval.i_int = __MIN( __MAX( newval.i_int, 0 ), 10 );
 625         if( newval.i_int == 3 || newval.i_int == 7 )
 626             newval.i_int = 5;
 627         while( pi_align_values[i_old] != p_sys->i_align ) i_old++;
 628         while( pi_align_values[i_new] != newval.i_int ) i_new++;
 629         msg_Dbg( p_this, "Changing alignment from %d (%s) to %d (%s)",
 630                      p_sys->i_align, ppsz_align_descriptions[i_old],
 631                      newval.i_int, ppsz_align_descriptions[i_new] );
 632         p_sys->i_align = newval.i_int;
 633         vlc_mutex_unlock( &p_sys->lock );
 634     }
 635     else if( !strcmp( psz_var, "mosaic-vborder" ) )
 636     {
 637         vlc_mutex_lock( &p_sys->lock );
 638         msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
 639                          p_sys->i_vborder, newval.i_int );
 640         p_sys->i_vborder = __MAX( newval.i_int, 0 );
 641         vlc_mutex_unlock( &p_sys->lock );
 642     }
 643     else if( !strcmp( psz_var, "mosaic-hborder" ) )
 644     {
 645         vlc_mutex_lock( &p_sys->lock );
 646         msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
 647                          p_sys->i_vborder, newval.i_int );
 648         p_sys->i_hborder = __MAX( newval.i_int, 0 );
 649         vlc_mutex_unlock( &p_sys->lock );
 650     }
 651     else if( !strcmp( psz_var, "mosaic-position" ) )
 652     {
 653         if( newval.i_int > 1 || newval.i_int < 0 )
 654         {
 655             msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
 656         }
 657         else
 658         {
 659             vlc_mutex_lock( &p_sys->lock );
 660             msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
 661                              p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
 662                              newval.i_int, ppsz_pos_descriptions[newval.i_int]);
 663             p_sys->i_position = newval.i_int;
 664             vlc_mutex_unlock( &p_sys->lock );
 665         }
 666     }
 667     else if( !strcmp( psz_var, "mosaic-rows" ) )
 668     {
 669         vlc_mutex_lock( &p_sys->lock );
 670         msg_Dbg( p_this, "Changing number of rows from %d to %d",
 671                          p_sys->i_rows, newval.i_int );
 672         p_sys->i_rows = __MAX( newval.i_int, 1 );
 673         vlc_mutex_unlock( &p_sys->lock );
 674     }
 675     else if( !strcmp( psz_var, "mosaic-cols" ) )
 676     {
 677         vlc_mutex_lock( &p_sys->lock );
 678         msg_Dbg( p_this, "Changing number of columns from %d to %d",
 679                          p_sys->i_cols, newval.i_int );
 680         p_sys->i_cols = __MAX( newval.i_int, 1 );
 681         vlc_mutex_unlock( &p_sys->lock );
 682     }
 683     else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
 684     {
 685         vlc_mutex_lock( &p_sys->lock );
 686         if( newval.i_int )
 687         {
 688             msg_Dbg( p_this, "Keep aspect ratio" );
 689             p_sys->b_ar = 1;
 690         }
 691         else
 692         {
 693             msg_Dbg( p_this, "Don't keep aspect ratio" );
 694             p_sys->b_ar = 0;
 695         }
 696         vlc_mutex_unlock( &p_sys->lock );
 697     }
 698     return VLC_SUCCESS;
 699 }