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 "../video_output/picture.h"
  43
  44 /*****************************************************************************
  45  * Local prototypes
  46  *****************************************************************************/
  47 static int  CreateFilter    ( vlc_object_t * );
  48 static void DestroyFilter   ( vlc_object_t * );
  49
  50 static subpicture_t *Filter( filter_t *, mtime_t );
  51
  52 static int MosaicCallback( vlc_object_t *, char const *, vlc_value_t,
  53                            vlc_value_t, void * );
  54
  55 /*****************************************************************************
  56  * filter_sys_t : filter descriptor
  57  *****************************************************************************/
  58 struct filter_sys_t
  59 {
  60     vlc_mutex_t lock;
  61
  62     image_handler_t *p_image;
  63 #ifdef IMAGE_2PASSES
  64     image_handler_t *p_image2;
  65 #endif
  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, >= 100 ms). 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", 100, NULL, DELAY_TEXT, DELAY_LONGTEXT,
 149                  VLC_FALSE );
 150 vlc_module_end();
 151
 152
 153 /*****************************************************************************
 154  * CreateFiler: allocate mosaic video filter
 155  *****************************************************************************/
 156 static int CreateFilter( vlc_object_t *p_this )
 157 {
 158     filter_t *p_filter = (filter_t *)p_this;
 159     filter_sys_t *p_sys;
 160     libvlc_t *p_libvlc = p_filter->p_libvlc;
 161     char *psz_order;
 162     int i_index;
 163
 164     /* Allocate structure */
 165     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 166     if( p_sys == NULL )
 167     {
 168         msg_Err( p_filter, "out of memory" );
 169         return VLC_ENOMEM;
 170     }
 171
 172     p_filter->pf_sub_filter = Filter;
 173     p_sys->p_pic = NULL;
 174
 175     vlc_mutex_init( p_filter, &p_sys->lock );
 176     vlc_mutex_lock( &p_sys->lock );
 177
 178 #define GET_VAR( name, min, max )                                           \
 179     p_sys->i_##name = __MIN( max, __MAX( min,                               \
 180                 var_CreateGetInteger( p_filter, "mosaic-" #name ) ) );      \
 181     var_Destroy( p_filter, "mosaic-" #name );                               \
 182     var_Create( p_libvlc, "mosaic-" #name, VLC_VAR_INTEGER );               \
 183     var_SetInteger( p_libvlc, "mosaic-" #name, p_sys->i_##name );           \
 184     var_AddCallback( p_libvlc, "mosaic-" #name, MosaicCallback, p_sys );
 185
 186     GET_VAR( width, 0, INT_MAX );
 187     GET_VAR( height, 0, INT_MAX );
 188     GET_VAR( xoffset, 0, INT_MAX );
 189     GET_VAR( yoffset, 0, INT_MAX );
 190
 191     p_sys->i_align = __MIN( 10, __MAX( 0,  var_CreateGetInteger( p_filter, "mosaic-align" ) ) );
 192     if( p_sys->i_align == 3 || p_sys->i_align == 7 )
 193         p_sys->i_align = 5;
 194     var_Destroy( p_filter, "mosaic-align" );
 195     var_Create( p_libvlc, "mosaic-align", VLC_VAR_INTEGER );
 196     var_SetInteger( p_libvlc, "mosaic-align", p_sys->i_align );
 197     var_AddCallback( p_libvlc, "mosaic-align", MosaicCallback, p_sys );
 198
 199     GET_VAR( vborder, 0, INT_MAX );
 200     GET_VAR( hborder, 0, INT_MAX );
 201     GET_VAR( rows, 1, INT_MAX );
 202     GET_VAR( cols, 1, INT_MAX );
 203     GET_VAR( alpha, 0, 255 );
 204     GET_VAR( position, 0, 1 );
 205     GET_VAR( delay, 100, INT_MAX );
 206     p_sys->i_delay *= 1000;
 207
 208     p_sys->b_ar = var_CreateGetBool( p_filter, "mosaic-keep-aspect-ratio" );
 209     var_Destroy( p_filter, "mosaic-keep-aspect-ratio" );
 210     var_Create( p_libvlc, "mosaic-keep-aspect-ratio", VLC_VAR_INTEGER );
 211     var_SetBool( p_libvlc, "mosaic-keep-aspect-ratio", p_sys->b_ar );
 212     var_AddCallback( p_libvlc, "mosaic-keep-aspect-ratio", MosaicCallback,
 213                      p_sys );
 214
 215     p_sys->b_keep = var_CreateGetBool( p_filter, "mosaic-keep-picture" );
 216     if ( !p_sys->b_keep )
 217     {
 218         p_sys->p_image = image_HandlerCreate( p_filter );
 219 #ifdef IMAGE_2PASSES
 220         p_sys->p_image2 = image_HandlerCreate( p_filter );
 221 #endif
 222     }
 223
 224     p_sys->i_order_length = 0;
 225     p_sys->ppsz_order = NULL;
 226     psz_order = var_CreateGetString( p_filter, "mosaic-order" );
 227
 228     if( psz_order[0] != 0 )
 229     {
 230         char *psz_end = NULL;
 231         i_index = 0;
 232         do
 233         {
 234             psz_end = strchr( psz_order, ',' );
 235             i_index++;
 236             p_sys->ppsz_order = realloc( p_sys->ppsz_order,
 237                                          i_index * sizeof(char *) );
 238             p_sys->ppsz_order[i_index - 1] = strndup( psz_order,
 239                                            psz_end - psz_order );
 240             psz_order = psz_end+1;
 241         } while( NULL !=  psz_end );
 242         p_sys->i_order_length = i_index;
 243     }
 244
 245     vlc_mutex_unlock( &p_sys->lock );
 246
 247     vlc_thread_set_priority( p_filter, VLC_THREAD_PRIORITY_OUTPUT );
 248
 249     return VLC_SUCCESS;
 250 }
 251
 252 /*****************************************************************************
 253  * DestroyFilter: destroy mosaic video filter
 254  *****************************************************************************/
 255 static void DestroyFilter( vlc_object_t *p_this )
 256 {
 257     filter_t *p_filter = (filter_t*)p_this;
 258     filter_sys_t *p_sys = p_filter->p_sys;
 259     libvlc_t *p_libvlc = p_filter->p_libvlc;
 260     int i_index;
 261
 262     vlc_mutex_lock( &p_sys->lock );
 263
 264     if( !p_sys->b_keep )
 265     {
 266         image_HandlerDelete( p_sys->p_image );
 267 #ifdef IMAGE_2PASSES
 268         image_HandlerDelete( p_sys->p_image2 );
 269 #endif
 270     }
 271
 272     if( p_sys->i_order_length )
 273     {
 274         for( i_index = 0; i_index < p_sys->i_order_length; i_index++ )
 275         {
 276             free( p_sys->ppsz_order[i_index] );
 277         }
 278         free( p_sys->ppsz_order );
 279     }
 280
 281     var_Destroy( p_libvlc, "mosaic-alpha" );
 282     var_Destroy( p_libvlc, "mosaic-height" );
 283     var_Destroy( p_libvlc, "mosaic-align" );
 284     var_Destroy( p_libvlc, "mosaic-width" );
 285     var_Destroy( p_libvlc, "mosaic-xoffset" );
 286     var_Destroy( p_libvlc, "mosaic-yoffset" );
 287     var_Destroy( p_libvlc, "mosaic-vborder" );
 288     var_Destroy( p_libvlc, "mosaic-hborder" );
 289     var_Destroy( p_libvlc, "mosaic-position" );
 290     var_Destroy( p_libvlc, "mosaic-rows" );
 291     var_Destroy( p_libvlc, "mosaic-cols" );
 292     var_Destroy( p_libvlc, "mosaic-keep-aspect-ratio" );
 293
 294     if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
 295     vlc_mutex_unlock( &p_sys->lock );
 296     vlc_mutex_destroy( &p_sys->lock );
 297     free( p_sys );
 298 }
 299
 300 /*****************************************************************************
 301  * MosaicReleasePicture : Hack to avoid picture duplication
 302  *****************************************************************************/
 303 static void MosaicReleasePicture( picture_t *p_picture )
 304 {
 305     picture_t *p_original_pic = (picture_t *)p_picture->p_sys;
 306
 307     p_original_pic->pf_release( p_original_pic );
 308 }
 309
 310 /*****************************************************************************
 311  * Filter
 312  *****************************************************************************/
 313 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
 314 {
 315     filter_sys_t *p_sys = p_filter->p_sys;
 316     libvlc_t *p_libvlc = p_filter->p_libvlc;
 317
 318     subpicture_t *p_spu;
 319
 320     int i_index, i_real_index, i_row, i_col;
 321     int i_greatest_real_index_used = p_sys->i_order_length - 1;
 322
 323     subpicture_region_t *p_region;
 324     subpicture_region_t *p_region_prev = NULL;
 325
 326     picture_vout_t *p_picture_vout;
 327     vlc_value_t val, lockval;
 328
 329     /* Wait for the specified date. This is to avoid running too fast and
 330      * take twice the same pictures. */
 331     mwait( date - p_sys->i_delay );
 332
 333     if ( var_Get( p_libvlc, "picture-lock", &lockval ) )
 334         return NULL;
 335
 336     vlc_mutex_lock( lockval.p_address );
 337
 338     if( var_Get( p_libvlc, "p_picture_vout", &val ) )
 339     {
 340         vlc_mutex_unlock( lockval.p_address );
 341         return NULL;
 342     }
 343
 344     p_picture_vout = val.p_address;
 345
 346     /* Allocate the subpicture internal data. */
 347     p_spu = p_filter->pf_sub_buffer_new( p_filter );
 348     if( !p_spu )
 349     {
 350         return NULL;
 351     }
 352
 353     /* Initialize subpicture */
 354     p_spu->i_channel = 0;
 355     p_spu->i_start  = date;
 356     p_spu->i_stop = 0;
 357     p_spu->b_ephemer = VLC_TRUE;
 358     p_spu->i_alpha = p_sys->i_alpha;
 359     p_spu->i_flags = p_sys->i_align;
 360     p_spu->b_absolute = VLC_FALSE;
 361
 362     vlc_mutex_lock( &p_sys->lock );
 363
 364     if( p_sys->i_position == 0 ) /* use automatic positioning */
 365     {
 366         int i_numpics = p_sys->i_order_length; /* keep slots and all */
 367         for( i_index = 0;
 368              i_index < p_picture_vout->i_picture_num;
 369              i_index++ )
 370         {
 371             if( p_picture_vout->p_pic[i_index].i_status
 372                            == PICTURE_VOUT_E_OCCUPIED )
 373             {
 374                 i_numpics ++;
 375                 if( p_sys->i_order_length
 376                     && p_picture_vout->p_pic[i_index].psz_id != 0 )
 377                 {
 378                     /* We also want to leave slots for images given in
 379                      * mosaic-order that are not available in p_vout_picture */
 380                     int i;
 381                     for( i = 0; i < p_sys->i_order_length ; i++ )
 382                     {
 383                         if( !strcmp( p_sys->ppsz_order[i],
 384                                      p_picture_vout->p_pic[i_index].psz_id ) )
 385                         {
 386                             i_numpics--;
 387                             break;
 388                         }
 389                     }
 390
 391                 }
 392             }
 393         }
 394         p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
 395         p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
 396                             i_numpics / p_sys->i_rows :
 397                             i_numpics / p_sys->i_rows + 1 );
 398     }
 399
 400     i_real_index = 0;
 401
 402     for( i_index = 0; i_index < p_picture_vout->i_picture_num; i_index++ )
 403     {
 404         picture_vout_e_t *p_pic = &p_picture_vout->p_pic[i_index];
 405         video_format_t fmt_in = {0}, fmt_out = {0};
 406         picture_t *p_converted;
 407 #ifdef IMAGE_2PASSES
 408         video_format_t fmt_middle = {0};
 409         picture_t *p_middle;
 410 #endif
 411
 412         if( p_pic->i_status == PICTURE_VOUT_E_AVAILABLE
 413              || p_pic->p_picture == NULL )
 414         {
 415             continue;
 416         }
 417
 418         if( p_sys->i_order_length == 0 )
 419         {
 420             i_real_index++;
 421         }
 422         else
 423         {
 424             int i;
 425             for( i = 0; i <= p_sys->i_order_length; i++ )
 426             {
 427                 if( i == p_sys->i_order_length ) break;
 428                 if( strcmp( p_pic->psz_id, p_sys->ppsz_order[i] ) == 0 )
 429                 {
 430                     i_real_index = i;
 431                     break;
 432                 }
 433             }
 434             if( i == p_sys->i_order_length )
 435                 i_real_index = ++i_greatest_real_index_used;
 436         }
 437         i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
 438         i_col = i_real_index % p_sys->i_cols ;
 439
 440         if( !p_sys->b_keep )
 441         {
 442             /* Convert the images */
 443             fmt_in.i_chroma = p_pic->p_picture->format.i_chroma;
 444             fmt_in.i_height = p_pic->p_picture->format.i_height;
 445             fmt_in.i_width = p_pic->p_picture->format.i_width;
 446
 447             fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
 448             fmt_out.i_width = fmt_in.i_width *
 449                 ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 450                   / p_sys->i_cols ) / fmt_in.i_width;
 451             fmt_out.i_height = fmt_in.i_height *
 452                 ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 453                   / p_sys->i_rows ) / fmt_in.i_height;
 454             if( p_sys->b_ar ) /* keep aspect ratio */
 455             {
 456                 if( (float)fmt_out.i_width / (float)fmt_out.i_height
 457                       > (float)fmt_in.i_width / (float)fmt_in.i_height )
 458                 {
 459                     fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
 460                                          / fmt_in.i_height ;
 461                 }
 462                 else
 463                 {
 464                     fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
 465                                         / fmt_in.i_width ;
 466                 }
 467              }
 468
 469             fmt_out.i_visible_width = fmt_out.i_width;
 470             fmt_out.i_visible_height = fmt_out.i_height;
 471
 472 #ifdef IMAGE_2PASSES
 473             fmt_middle.i_chroma = fmt_in.i_chroma;
 474             fmt_middle.i_visible_width = fmt_middle.i_width = fmt_out.i_width;
 475             fmt_middle.i_visible_height = fmt_middle.i_height = fmt_out.i_height;
 476
 477             p_middle = image_Convert( p_sys->p_image2, p_pic->p_picture,
 478                                       &fmt_in, &fmt_middle );
 479             if( !p_middle )
 480             {
 481                 msg_Warn( p_filter, "image resizing failed" );
 482                 continue;
 483             }
 484
 485             p_converted = image_Convert( p_sys->p_image, p_middle,
 486                                          &fmt_middle, &fmt_out );
 487             p_middle->pf_release( p_middle );
 488
 489             if( !p_converted )
 490             {
 491                 msg_Warn( p_filter, "image chroma conversion failed" );
 492                 continue;
 493             }
 494 #else
 495             p_converted = image_Convert( p_sys->p_image, p_pic->p_picture,
 496                                          &fmt_in, &fmt_out );
 497             if( !p_converted )
 498             {
 499                 msg_Warn( p_filter,
 500                            "image resizing and chroma conversion failed" );
 501                 continue;
 502             }
 503 #endif
 504         }
 505         else
 506         {
 507             p_converted = p_pic->p_picture;
 508             p_converted->i_refcount++;
 509             fmt_in.i_width = fmt_out.i_width = p_converted->format.i_width;
 510             fmt_in.i_height = fmt_out.i_height = p_converted->format.i_height;
 511             fmt_in.i_chroma = fmt_out.i_chroma = p_converted->format.i_chroma;
 512             fmt_out.i_visible_width = fmt_out.i_width;
 513             fmt_out.i_visible_height = fmt_out.i_height;
 514         }
 515
 516         p_region = p_spu->pf_make_region( VLC_OBJECT(p_filter), &fmt_out,
 517                                           p_converted );
 518         if( !p_region )
 519         {
 520             msg_Err( p_filter, "cannot allocate SPU region" );
 521             p_filter->pf_sub_buffer_del( p_filter, p_spu );
 522             vlc_mutex_unlock( &p_sys->lock );
 523             vlc_mutex_unlock( lockval.p_address );
 524             return NULL;
 525         }
 526
 527         /* HACK ALERT : let's fix the pointers to avoid picture duplication.
 528          * This is necessary because p_region->picture is not a pointer
 529          * as it ought to be. */
 530         if( !p_sys->b_keep )
 531         {
 532             free( p_converted );
 533         }
 534         else
 535         {
 536             /* Keep a pointer to the original picture (and its refcount...). */
 537             p_region->picture.p_sys = (picture_sys_t *)p_converted;
 538             p_region->picture.pf_release = MosaicReleasePicture;
 539         }
 540
 541         if( p_sys->b_ar || p_sys->b_keep ) /* keep aspect ratio */
 542         {
 543             /* center the video in the dedicated rectangle */
 544             p_region->i_x = p_sys->i_xoffset
 545                         + i_col * ( p_sys->i_width / p_sys->i_cols )
 546                         + ( i_col * p_sys->i_vborder ) / p_sys->i_cols
 547                         + ( ( ( p_sys->i_width
 548                                  - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 549                             / p_sys->i_cols ) - fmt_out.i_width ) / 2;
 550             p_region->i_y = p_sys->i_yoffset
 551                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 552                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows
 553                         + ( ( ( p_sys->i_height
 554                                  - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 555                             / p_sys->i_rows ) - fmt_out.i_height ) / 2;
 556         }
 557         else
 558         {
 559             /* we don't have to center the video since it takes the
 560             whole rectangle area */
 561             p_region->i_x = p_sys->i_xoffset
 562                             + i_col * ( p_sys->i_width / p_sys->i_cols )
 563                             + ( i_col * p_sys->i_vborder ) / p_sys->i_cols;
 564             p_region->i_y = p_sys->i_yoffset
 565                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 566                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows;
 567         }
 568
 569         if( p_region_prev == NULL )
 570         {
 571             p_spu->p_region = p_region;
 572         }
 573         else
 574         {
 575             p_region_prev->p_next = p_region;
 576         }
 577
 578         p_region_prev = p_region;
 579     }
 580
 581     vlc_mutex_unlock( &p_sys->lock );
 582     vlc_mutex_unlock( lockval.p_address );
 583
 584     return p_spu;
 585 }
 586
 587 /*****************************************************************************
 588 * Callback to update params on the fly
 589 *****************************************************************************/
 590 static int MosaicCallback( vlc_object_t *p_this, char const *psz_var,
 591                             vlc_value_t oldval, vlc_value_t newval,
 592                             void *p_data )
 593 {
 594     filter_sys_t *p_sys = (filter_sys_t *) p_data;
 595     if( !strcmp( psz_var, "mosaic-alpha" ) )
 596     {
 597         vlc_mutex_lock( &p_sys->lock );
 598         msg_Dbg( p_this, "Changing alpha from %d/255 to %d/255",
 599                          p_sys->i_alpha, newval.i_int);
 600         p_sys->i_alpha = __MIN( __MAX( newval.i_int, 0 ), 255 );
 601         vlc_mutex_unlock( &p_sys->lock );
 602     }
 603     else if( !strcmp( psz_var, "mosaic-height" ) )
 604     {
 605         vlc_mutex_lock( &p_sys->lock );
 606         msg_Dbg( p_this, "Changing height from %dpx to %dpx",
 607                           p_sys->i_height, newval.i_int );
 608         p_sys->i_height = __MAX( newval.i_int, 0 );
 609         vlc_mutex_unlock( &p_sys->lock );
 610     }
 611     else if( !strcmp( psz_var, "mosaic-width" ) )
 612     {
 613         vlc_mutex_lock( &p_sys->lock );
 614         msg_Dbg( p_this, "Changing width from %dpx to %dpx",
 615                          p_sys->i_width, newval.i_int );
 616         p_sys->i_width = __MAX( newval.i_int, 0 );
 617         vlc_mutex_unlock( &p_sys->lock );
 618     }
 619     else if( !strcmp( psz_var, "mosaic-xoffset" ) )
 620     {
 621         vlc_mutex_lock( &p_sys->lock );
 622         msg_Dbg( p_this, "Changing x offset from %dpx to %dpx",
 623                          p_sys->i_xoffset, newval.i_int );
 624         p_sys->i_xoffset = __MAX( newval.i_int, 0 );
 625         vlc_mutex_unlock( &p_sys->lock );
 626     }
 627     else if( !strcmp( psz_var, "mosaic-yoffset" ) )
 628     {
 629         vlc_mutex_lock( &p_sys->lock );
 630         msg_Dbg( p_this, "Changing y offset from %dpx to %dpx",
 631                          p_sys->i_yoffset, newval.i_int );
 632         p_sys->i_yoffset = __MAX( newval.i_int, 0 );
 633         vlc_mutex_unlock( &p_sys->lock );
 634     }
 635     else if( !strcmp( psz_var, "mosaic-align" ) )
 636     {
 637         int i_old = 0, i_new = 0;
 638         vlc_mutex_lock( &p_sys->lock );
 639         newval.i_int = __MIN( __MAX( newval.i_int, 0 ), 10 );
 640         if( newval.i_int == 3 || newval.i_int == 7 )
 641             newval.i_int = 5;
 642         while( pi_align_values[i_old] != p_sys->i_align ) i_old++;
 643         while( pi_align_values[i_new] != newval.i_int ) i_new++;
 644         msg_Dbg( p_this, "Changing alignment from %d (%s) to %d (%s)",
 645                      p_sys->i_align, ppsz_align_descriptions[i_old],
 646                      newval.i_int, ppsz_align_descriptions[i_new] );
 647         p_sys->i_align = newval.i_int;
 648         vlc_mutex_unlock( &p_sys->lock );
 649     }
 650     else if( !strcmp( psz_var, "mosaic-vborder" ) )
 651     {
 652         vlc_mutex_lock( &p_sys->lock );
 653         msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
 654                          p_sys->i_vborder, newval.i_int );
 655         p_sys->i_vborder = __MAX( newval.i_int, 0 );
 656         vlc_mutex_unlock( &p_sys->lock );
 657     }
 658     else if( !strcmp( psz_var, "mosaic-hborder" ) )
 659     {
 660         vlc_mutex_lock( &p_sys->lock );
 661         msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
 662                          p_sys->i_vborder, newval.i_int );
 663         p_sys->i_hborder = __MAX( newval.i_int, 0 );
 664         vlc_mutex_unlock( &p_sys->lock );
 665     }
 666     else if( !strcmp( psz_var, "mosaic-position" ) )
 667     {
 668         if( newval.i_int > 1 || newval.i_int < 0 )
 669         {
 670             msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
 671         }
 672         else
 673         {
 674             vlc_mutex_lock( &p_sys->lock );
 675             msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
 676                              p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
 677                              newval.i_int, ppsz_pos_descriptions[newval.i_int]);
 678             p_sys->i_position = newval.i_int;
 679             vlc_mutex_unlock( &p_sys->lock );
 680         }
 681     }
 682     else if( !strcmp( psz_var, "mosaic-rows" ) )
 683     {
 684         vlc_mutex_lock( &p_sys->lock );
 685         msg_Dbg( p_this, "Changing number of rows from %d to %d",
 686                          p_sys->i_rows, newval.i_int );
 687         p_sys->i_rows = __MAX( newval.i_int, 1 );
 688         vlc_mutex_unlock( &p_sys->lock );
 689     }
 690     else if( !strcmp( psz_var, "mosaic-cols" ) )
 691     {
 692         vlc_mutex_lock( &p_sys->lock );
 693         msg_Dbg( p_this, "Changing number of columns from %d to %d",
 694                          p_sys->i_cols, newval.i_int );
 695         p_sys->i_cols = __MAX( newval.i_int, 1 );
 696         vlc_mutex_unlock( &p_sys->lock );
 697     }
 698     else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
 699     {
 700         vlc_mutex_lock( &p_sys->lock );
 701         if( newval.i_int )
 702         {
 703             msg_Dbg( p_this, "Keep aspect ratio" );
 704             p_sys->b_ar = 1;
 705         }
 706         else
 707         {
 708             msg_Dbg( p_this, "Don't keep aspect ratio" );
 709             p_sys->b_ar = 0;
 710         }
 711         vlc_mutex_unlock( &p_sys->lock );
 712     }
 713     return VLC_SUCCESS;
 714 }