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 #include "vlc_filter.h"
  36 #include "vlc_image.h"
  37
  38 #include "../video_output/picture.h"
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  CreateFilter    ( vlc_object_t * );
  44 static void DestroyFilter   ( vlc_object_t * );
  45
  46 static subpicture_t *Filter( filter_t *, mtime_t );
  47
  48 static int MosaicCallback( vlc_object_t *, char const *, vlc_value_t,
  49                            vlc_value_t, void * );
  50
  51 /*****************************************************************************
  52  * filter_sys_t : filter descriptor
  53  *****************************************************************************/
  54 struct filter_sys_t
  55 {
  56     image_handler_t *p_image;
  57 #ifdef IMAGE_2PASSES
  58     image_handler_t *p_image2;
  59 #endif
  60     picture_t *p_pic;
  61
  62     int i_position; /* mosaic positioning method */
  63     vlc_bool_t b_ar; /* do we keep the aspect ratio ? */
  64     vlc_bool_t b_keep; /* do we keep the original picture format ? */
  65     int i_width, i_height; /* mosaic height and width */
  66     int i_cols, i_rows; /* mosaic rows and cols */
  67     int i_xoffset, i_yoffset; /* top left corner offset */
  68     int i_vborder, i_hborder; /* border width/height between miniatures */
  69     int i_alpha; /* subfilter alpha blending */
  70
  71     char **ppsz_order; /* list of picture-id */
  72     int i_order_length;
  73
  74     mtime_t i_delay;
  75 };
  76
  77 /*****************************************************************************
  78  * Module descriptor
  79  *****************************************************************************/
  80 #define ALPHA_TEXT N_("Alpha blending")
  81 #define ALPHA_LONGTEXT N_("Alpha blending (0 -> 255). Default is 255")
  82
  83 #define HEIGHT_TEXT N_("Height in pixels")
  84 #define WIDTH_TEXT N_("Width in pixels")
  85 #define XOFFSET_TEXT N_("Top left corner x coordinate")
  86 #define YOFFSET_TEXT N_("Top left corner y coordinate")
  87 #define VBORDER_TEXT N_("Vertical border width in pixels")
  88 #define HBORDER_TEXT N_("Horizontal border width in pixels")
  89
  90 #define POS_TEXT N_("Positioning method")
  91 #define POS_LONGTEXT N_("Positioning method. auto : automatically choose " \
  92         "the best number of rows and columns. fixed : use the user-defined " \
  93         "number of rows and columns.")
  94 #define ROWS_TEXT N_("Number of rows")
  95 #define COLS_TEXT N_("Number of columns")
  96 #define AR_TEXT N_("Keep aspect ratio when resizing")
  97 #define KEEP_TEXT N_("Keep original size")
  98
  99 #define ORDER_TEXT N_("Order as a comma separated list of picture-id(s)")
 100
 101 #define DELAY_TEXT N_("Delay")
 102 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
 103         "will be delayed accordingly (in milliseconds, >= 100 ms). For high " \
 104         "values you will need to raise file-caching and others.")
 105
 106 static int pi_pos_values[] = { 0, 1 };
 107 static char * ppsz_pos_descriptions[] =
 108 { N_("auto"), N_("fixed") };
 109
 110
 111 vlc_module_begin();
 112     set_description( N_("Mosaic video sub filter") );
 113     set_shortname( N_("Mosaic") );
 114     set_capability( "sub filter", 0 );
 115     set_callbacks( CreateFilter, DestroyFilter );
 116
 117     add_integer( "mosaic-alpha", 255, NULL, ALPHA_TEXT, ALPHA_LONGTEXT, VLC_FALSE );
 118     add_integer( "mosaic-height", 100, NULL, HEIGHT_TEXT, HEIGHT_TEXT, VLC_FALSE );
 119     add_integer( "mosaic-width", 100, NULL, WIDTH_TEXT, WIDTH_TEXT, VLC_FALSE );
 120     add_integer( "mosaic-xoffset", 0, NULL, XOFFSET_TEXT, XOFFSET_TEXT, VLC_TRUE );
 121     add_integer( "mosaic-yoffset", 0, NULL, YOFFSET_TEXT, YOFFSET_TEXT, VLC_TRUE );
 122     add_integer( "mosaic-vborder", 0, NULL, VBORDER_TEXT, VBORDER_TEXT, VLC_TRUE );
 123     add_integer( "mosaic-hborder", 0, NULL, HBORDER_TEXT, HBORDER_TEXT, VLC_TRUE );
 124
 125     add_integer( "mosaic-position", 0, NULL, POS_TEXT, POS_LONGTEXT, VLC_FALSE );
 126         change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
 127     add_integer( "mosaic-rows", 2, NULL, ROWS_TEXT, ROWS_TEXT, VLC_FALSE );
 128     add_integer( "mosaic-cols", 2, NULL, COLS_TEXT, COLS_TEXT, VLC_FALSE );
 129     add_bool( "mosaic-keep-aspect-ratio", 0, NULL, AR_TEXT, AR_TEXT, VLC_FALSE );
 130     add_bool( "mosaic-keep-picture", 0, NULL, KEEP_TEXT, KEEP_TEXT, VLC_FALSE );
 131     add_string( "mosaic-order", "", NULL, ORDER_TEXT, ORDER_TEXT, VLC_FALSE );
 132
 133     add_integer( "mosaic-delay", 100, NULL, DELAY_TEXT, DELAY_LONGTEXT,
 134                  VLC_FALSE );
 135 vlc_module_end();
 136
 137
 138 /*****************************************************************************
 139  * CreateFiler: allocate mosaic video filter
 140  *****************************************************************************/
 141 static int CreateFilter( vlc_object_t *p_this )
 142 {
 143     filter_t *p_filter = (filter_t *)p_this;
 144     filter_sys_t *p_sys;
 145     libvlc_t *p_libvlc = p_filter->p_libvlc;
 146     char *psz_order;
 147     int i_index;
 148
 149     /* Allocate structure */
 150     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 151     if( p_sys == NULL )
 152     {
 153         msg_Err( p_filter, "out of memory" );
 154         return VLC_ENOMEM;
 155     }
 156
 157     p_filter->pf_sub_filter = Filter;
 158     p_sys->p_pic = NULL;
 159
 160 #define GET_VAR( name, min, max )                                           \
 161     p_sys->i_##name = __MIN( max, __MAX( min,                               \
 162                 var_CreateGetInteger( p_filter, "mosaic-" #name ) ) );      \
 163     var_Destroy( p_filter, "mosaic-" #name );                               \
 164     var_Create( p_libvlc, "mosaic-" #name, VLC_VAR_INTEGER );               \
 165     var_SetInteger( p_libvlc, "mosaic-" #name, p_sys->i_##name );           \
 166     var_AddCallback( p_libvlc, "mosaic-" #name, MosaicCallback, p_sys );
 167
 168     GET_VAR( width, 0, INT32_MAX );
 169     GET_VAR( height, 0, INT32_MAX );
 170     GET_VAR( xoffset, 0, INT32_MAX );
 171     GET_VAR( yoffset, 0, INT32_MAX );
 172     GET_VAR( vborder, 0, INT32_MAX );
 173     GET_VAR( hborder, 0, INT32_MAX );
 174     GET_VAR( rows, 1, INT32_MAX );
 175     GET_VAR( cols, 1, INT32_MAX );
 176     GET_VAR( alpha, 0, 255 );
 177     GET_VAR( position, 0, 1 );
 178     GET_VAR( delay, 100, INT32_MAX );
 179     p_sys->i_delay *= 1000;
 180
 181     p_sys->b_ar = var_CreateGetBool( p_filter, "mosaic-keep-aspect-ratio" );
 182     var_Destroy( p_filter, "mosaic-keep-aspect-ratio" );
 183     var_Create( p_libvlc, "mosaic-keep-aspect-ratio", VLC_VAR_INTEGER );
 184     var_SetBool( p_libvlc, "mosaic-keep-aspect-ratio", p_sys->b_ar );
 185     var_AddCallback( p_libvlc, "mosaic-keep-aspect-ratio", MosaicCallback,
 186                      p_sys );
 187
 188     p_sys->b_keep = var_CreateGetBool( p_filter, "mosaic-keep-picture" );
 189     if ( !p_sys->b_keep )
 190     {
 191         p_sys->p_image = image_HandlerCreate( p_filter );
 192 #ifdef IMAGE_2PASSES
 193         p_sys->p_image2 = image_HandlerCreate( p_filter );
 194 #endif
 195     }
 196
 197     p_sys->i_order_length = 0;
 198     p_sys->ppsz_order = NULL;
 199     psz_order = var_CreateGetString( p_filter, "mosaic-order" );
 200
 201     if( psz_order[0] != 0 )
 202     {
 203         char *psz_end = NULL;
 204         i_index = 0;
 205         do
 206         {
 207             psz_end = strchr( psz_order, ',' );
 208             i_index++;
 209             p_sys->ppsz_order = realloc( p_sys->ppsz_order,
 210                                          i_index * sizeof(char *) );
 211             p_sys->ppsz_order[i_index - 1] = strndup( psz_order,
 212                                            psz_end - psz_order );
 213             psz_order = psz_end+1;
 214         } while( NULL !=  psz_end );
 215         p_sys->i_order_length = i_index;
 216     }
 217
 218     vlc_thread_set_priority( p_filter, VLC_THREAD_PRIORITY_OUTPUT );
 219
 220     return VLC_SUCCESS;
 221 }
 222
 223 /*****************************************************************************
 224  * DestroyFilter: destroy mosaic video filter
 225  *****************************************************************************/
 226 static void DestroyFilter( vlc_object_t *p_this )
 227 {
 228     filter_t *p_filter = (filter_t*)p_this;
 229     filter_sys_t *p_sys = p_filter->p_sys;
 230     libvlc_t *p_libvlc = p_filter->p_libvlc;
 231     int i_index;
 232
 233     if( !p_sys->b_keep )
 234     {
 235         image_HandlerDelete( p_sys->p_image );
 236 #ifdef IMAGE_2PASSES
 237         image_HandlerDelete( p_sys->p_image2 );
 238 #endif
 239     }
 240
 241     if( p_sys->i_order_length )
 242     {
 243         for( i_index = 0; i_index < p_sys->i_order_length; i_index++ )
 244         {
 245             free( p_sys->ppsz_order[i_index] );
 246         }
 247         free( p_sys->ppsz_order );
 248     }
 249
 250     var_Destroy( p_libvlc, "mosaic-alpha" );
 251     var_Destroy( p_libvlc, "mosaic-height" );
 252     var_Destroy( p_libvlc, "mosaic-width" );
 253     var_Destroy( p_libvlc, "mosaic-xoffset" );
 254     var_Destroy( p_libvlc, "mosaic-yoffset" );
 255     var_Destroy( p_libvlc, "mosaic-vborder" );
 256     var_Destroy( p_libvlc, "mosaic-hborder" );
 257     var_Destroy( p_libvlc, "mosaic-position" );
 258     var_Destroy( p_libvlc, "mosaic-rows" );
 259     var_Destroy( p_libvlc, "mosaic-cols" );
 260     var_Destroy( p_libvlc, "mosaic-keep-aspect-ratio" );
 261
 262     if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
 263     free( p_sys );
 264 }
 265
 266 /*****************************************************************************
 267  * MosaicReleasePicture : Hack to avoid picture duplication
 268  *****************************************************************************/
 269 static void MosaicReleasePicture( picture_t *p_picture )
 270 {
 271     picture_t *p_original_pic = (picture_t *)p_picture->p_sys;
 272
 273     p_original_pic->pf_release( p_original_pic );
 274 }
 275
 276 /*****************************************************************************
 277  * Filter
 278  *****************************************************************************/
 279 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
 280 {
 281     filter_sys_t *p_sys = p_filter->p_sys;
 282     libvlc_t *p_libvlc = p_filter->p_libvlc;
 283
 284     subpicture_t *p_spu;
 285
 286     int i_index, i_real_index, i_row, i_col;
 287     int i_greatest_real_index_used = p_sys->i_order_length - 1;
 288
 289     subpicture_region_t *p_region;
 290     subpicture_region_t *p_region_prev = NULL;
 291
 292     picture_vout_t *p_picture_vout;
 293     vlc_value_t val, lockval;
 294
 295     /* Wait for the specified date. This is to avoid running too fast and
 296      * take twice the same pictures. */
 297     mwait( date - p_sys->i_delay );
 298
 299     if ( var_Get( p_libvlc, "picture-lock", &lockval ) )
 300         return NULL;
 301
 302     vlc_mutex_lock( lockval.p_address );
 303
 304     if( var_Get( p_libvlc, "p_picture_vout", &val ) )
 305     {
 306         vlc_mutex_unlock( lockval.p_address );
 307         return NULL;
 308     }
 309
 310     p_picture_vout = val.p_address;
 311
 312     /* Allocate the subpicture internal data. */
 313     p_spu = p_filter->pf_sub_buffer_new( p_filter );
 314     if( !p_spu )
 315     {
 316         return NULL;
 317     }
 318
 319     /* Initialize subpicture */
 320     p_spu->i_channel = 0;
 321     p_spu->i_start  = date;
 322     p_spu->i_stop = 0;
 323     p_spu->b_ephemer = VLC_TRUE;
 324     p_spu->i_alpha = p_sys->i_alpha;
 325
 326     if( p_sys->i_position == 0 ) /* use automatic positioning */
 327     {
 328         int i_numpics = p_sys->i_order_length; /* keep slots and all */
 329         for( i_index = 0;
 330              i_index < p_picture_vout->i_picture_num;
 331              i_index++ )
 332         {
 333             if( p_picture_vout->p_pic[i_index].i_status
 334                            == PICTURE_VOUT_E_OCCUPIED )
 335             {
 336                 i_numpics ++;
 337                 if( p_sys->i_order_length
 338                     && p_picture_vout->p_pic[i_index].psz_id != 0 )
 339                 {
 340                     /* We also want to leave slots for images given in
 341                      * mosaic-order that are not available in p_vout_picture */
 342                     int i;
 343                     for( i = 0; i < p_sys->i_order_length ; i++ )
 344                     {
 345                         if( !strcmp( p_sys->ppsz_order[i],
 346                                      p_picture_vout->p_pic[i_index].psz_id ) )
 347                         {
 348                             i_numpics--;
 349                             break;
 350                         }
 351                     }
 352
 353                 }
 354             }
 355         }
 356         p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
 357         p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
 358                             i_numpics / p_sys->i_rows :
 359                             i_numpics / p_sys->i_rows + 1 );
 360     }
 361
 362     i_real_index = 0;
 363
 364     for( i_index = 0; i_index < p_picture_vout->i_picture_num; i_index++ )
 365     {
 366         picture_vout_e_t *p_pic = &p_picture_vout->p_pic[i_index];
 367         video_format_t fmt_in = {0}, fmt_out = {0};
 368         picture_t *p_converted;
 369 #ifdef IMAGE_2PASSES
 370         video_format_t fmt_middle = {0};
 371         picture_t *p_middle;
 372 #endif
 373
 374         if( p_pic->i_status == PICTURE_VOUT_E_AVAILABLE
 375              || p_pic->p_picture == NULL )
 376         {
 377             continue;
 378         }
 379
 380         if( p_sys->i_order_length == 0 )
 381         {
 382             i_real_index++;
 383         }
 384         else
 385         {
 386             int i;
 387             for( i = 0; i <= p_sys->i_order_length; i++ )
 388             {
 389                 if( i == p_sys->i_order_length ) break;
 390                 if( strcmp( p_pic->psz_id, p_sys->ppsz_order[i] ) == 0 )
 391                 {
 392                     i_real_index = i;
 393                     break;
 394                 }
 395             }
 396             if( i == p_sys->i_order_length )
 397                 i_real_index = ++i_greatest_real_index_used;
 398         }
 399         i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
 400         i_col = i_real_index % p_sys->i_cols ;
 401
 402         if( !p_sys->b_keep )
 403         {
 404             /* Convert the images */
 405             fmt_in.i_chroma = p_pic->p_picture->format.i_chroma;
 406             fmt_in.i_height = p_pic->p_picture->format.i_height;
 407             fmt_in.i_width = p_pic->p_picture->format.i_width;
 408
 409             fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
 410             fmt_out.i_width = fmt_in.i_width *
 411                 ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 412                   / p_sys->i_cols ) / fmt_in.i_width;
 413             fmt_out.i_height = fmt_in.i_height *
 414                 ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 415                   / p_sys->i_rows ) / fmt_in.i_height;
 416             if( p_sys->b_ar ) /* keep aspect ratio */
 417             {
 418                 if( (float)fmt_out.i_width / (float)fmt_out.i_height
 419                       > (float)fmt_in.i_width / (float)fmt_in.i_height )
 420                 {
 421                     fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
 422                                          / fmt_in.i_height ;
 423                 }
 424                 else
 425                 {
 426                     fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
 427                                         / fmt_in.i_width ;
 428                 }
 429              }
 430
 431             fmt_out.i_visible_width = fmt_out.i_width;
 432             fmt_out.i_visible_height = fmt_out.i_height;
 433
 434 #ifdef IMAGE_2PASSES
 435             fmt_middle.i_chroma = fmt_in.i_chroma;
 436             fmt_middle.i_visible_width = fmt_middle.i_width = fmt_out.i_width;
 437             fmt_middle.i_visible_height = fmt_middle.i_height = fmt_out.i_height;
 438
 439             p_middle = image_Convert( p_sys->p_image2, p_pic->p_picture,
 440                                       &fmt_in, &fmt_middle );
 441             if( !p_middle )
 442             {
 443                 msg_Warn( p_filter, "image resizing failed" );
 444                 continue;
 445             }
 446
 447             p_converted = image_Convert( p_sys->p_image, p_middle,
 448                                          &fmt_middle, &fmt_out );
 449             p_middle->pf_release( p_middle );
 450 #else
 451             p_converted = image_Convert( p_sys->p_image, p_pic->p_picture,
 452                                          &fmt_in, &fmt_out );
 453 #endif
 454             if( !p_converted )
 455             {
 456                 msg_Warn( p_filter, "image chroma conversion failed" );
 457                 continue;
 458             }
 459         }
 460         else
 461         {
 462             p_converted = p_pic->p_picture;
 463             p_converted->i_refcount++;
 464             fmt_in.i_width = fmt_out.i_width = p_converted->format.i_width;
 465             fmt_in.i_height = fmt_out.i_height = p_converted->format.i_height;
 466             fmt_in.i_chroma = fmt_out.i_chroma = p_converted->format.i_chroma;
 467             fmt_out.i_visible_width = fmt_out.i_width;
 468             fmt_out.i_visible_height = fmt_out.i_height;
 469         }
 470
 471         p_region = p_spu->pf_make_region( VLC_OBJECT(p_filter), &fmt_out,
 472                                           p_converted );
 473         if( !p_region )
 474         {
 475             msg_Err( p_filter, "cannot allocate SPU region" );
 476             p_filter->pf_sub_buffer_del( p_filter, p_spu );
 477             vlc_mutex_unlock( lockval.p_address );
 478             return NULL;
 479         }
 480
 481         /* HACK ALERT : let's fix the pointers to avoid picture duplication.
 482          * This is necessary because p_region->picture is not a pointer
 483          * as it ought to be. */
 484         if( !p_sys->b_keep )
 485         {
 486             free( p_converted );
 487         }
 488         else
 489         {
 490             /* Keep a pointer to the original picture (and its refcount...). */
 491             p_region->picture.p_sys = (picture_sys_t *)p_converted;
 492             p_region->picture.pf_release = MosaicReleasePicture;
 493         }
 494
 495         if( p_sys->b_ar || p_sys->b_keep ) /* keep aspect ratio */
 496         {
 497             /* center the video in the dedicated rectangle */
 498             p_region->i_x = p_sys->i_xoffset
 499                         + i_col * ( p_sys->i_width / p_sys->i_cols )
 500                         + ( i_col * p_sys->i_vborder ) / p_sys->i_cols
 501                         + ( ( ( p_sys->i_width
 502                                  - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 503                             / p_sys->i_cols ) - fmt_out.i_width ) / 2;
 504             p_region->i_y = p_sys->i_yoffset
 505                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 506                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows
 507                         + ( ( ( p_sys->i_height
 508                                  - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 509                             / p_sys->i_rows ) - fmt_out.i_height ) / 2;
 510         }
 511         else
 512         {
 513             /* we don't have to center the video since it takes the
 514             whole rectangle area */
 515             p_region->i_x = p_sys->i_xoffset
 516                             + i_col * ( p_sys->i_width / p_sys->i_cols )
 517                             + ( i_col * p_sys->i_vborder ) / p_sys->i_cols;
 518             p_region->i_y = p_sys->i_yoffset
 519                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 520                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows;
 521         }
 522
 523         if( p_region_prev == NULL )
 524         {
 525             p_spu->p_region = p_region;
 526         }
 527         else
 528         {
 529             p_region_prev->p_next = p_region;
 530         }
 531
 532         p_region_prev = p_region;
 533     }
 534
 535     vlc_mutex_unlock( lockval.p_address );
 536
 537     return p_spu;
 538 }
 539
 540 /*****************************************************************************
 541 * Callback to update params on the fly
 542 *****************************************************************************/
 543 static int MosaicCallback( vlc_object_t *p_this, char const *psz_var,
 544                             vlc_value_t oldval, vlc_value_t newval,
 545                             void *p_data )
 546 {
 547     filter_sys_t *p_sys = (filter_sys_t *) p_data;
 548     if( !strcmp( psz_var, "mosaic-alpha" ) )
 549     {
 550         msg_Dbg( p_this, "Changing alpha from %d/255 to %d/255",
 551                          p_sys->i_alpha, newval.i_int);
 552         p_sys->i_alpha = __MIN( __MAX( newval.i_int, 0 ), 255 );
 553     }
 554     else if( !strcmp( psz_var, "mosaic-height" ) )
 555     {
 556         msg_Dbg( p_this, "Changing height from %dpx to %dpx",
 557                           p_sys->i_height, newval.i_int );
 558         p_sys->i_height = __MAX( newval.i_int, 0 );
 559     }
 560     else if( !strcmp( psz_var, "mosaic-width" ) )
 561     {
 562         msg_Dbg( p_this, "Changing width from %dpx to %dpx",
 563                          p_sys->i_width, newval.i_int );
 564         p_sys->i_width = __MAX( newval.i_int, 0 );
 565     }
 566     else if( !strcmp( psz_var, "mosaic-xoffset" ) )
 567     {
 568         msg_Dbg( p_this, "Changing x offset from %dpx to %dpx",
 569                          p_sys->i_xoffset, newval.i_int );
 570         p_sys->i_xoffset = __MAX( newval.i_int, 0 );
 571     }
 572     else if( !strcmp( psz_var, "mosaic-yoffset" ) )
 573     {
 574         msg_Dbg( p_this, "Changing y offset from %dpx to %dpx",
 575                          p_sys->i_yoffset, newval.i_int );
 576         p_sys->i_yoffset = __MAX( newval.i_int, 0 );
 577     }
 578     else if( !strcmp( psz_var, "mosaic-vborder" ) )
 579     {
 580         msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
 581                          p_sys->i_vborder, newval.i_int );
 582         p_sys->i_vborder = __MAX( newval.i_int, 0 );
 583     }
 584     else if( !strcmp( psz_var, "mosaic-hborder" ) )
 585     {
 586         msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
 587                          p_sys->i_vborder, newval.i_int );
 588         p_sys->i_hborder = __MAX( newval.i_int, 0 );
 589     }
 590     else if( !strcmp( psz_var, "mosaic-position" ) )
 591     {
 592         if( newval.i_int > 1 || newval.i_int < 0 )
 593         {
 594             msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
 595         }
 596         else
 597         {
 598             msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
 599                              p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
 600                              newval.i_int, ppsz_pos_descriptions[newval.i_int]);
 601             p_sys->i_position = newval.i_int;
 602         }
 603     }
 604     else if( !strcmp( psz_var, "mosaic-rows" ) )
 605     {
 606         msg_Dbg( p_this, "Changing number of rows from %d to %d",
 607                          p_sys->i_rows, newval.i_int );
 608         p_sys->i_rows = __MAX( newval.i_int, 1 );
 609     }
 610     else if( !strcmp( psz_var, "mosaic-cols" ) )
 611     {
 612         msg_Dbg( p_this, "Changing number of columns from %d to %d",
 613                          p_sys->i_cols, newval.i_int );
 614         p_sys->i_cols = __MAX( newval.i_int, 1 );
 615     }
 616     else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
 617     {
 618         if( newval.i_int )
 619         {
 620             msg_Dbg( p_this, "Keep aspect ratio" );
 621             p_sys->b_ar = 1;
 622         }
 623         else
 624         {
 625             msg_Dbg( p_this, "Don't keep aspect ratio" );
 626             p_sys->b_ar = 0;
 627         }
 628     }
 629     return VLC_SUCCESS;
 630 }