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