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_xoffset, i_yoffset; /* top left corner offset */
  74     int i_vborder, i_hborder; /* border width/height between miniatures */
  75     int i_alpha; /* subfilter alpha blending */
  76
  77     char **ppsz_order; /* list of picture-id */
  78     int i_order_length;
  79
  80     mtime_t i_delay;
  81 };
  82
  83 /*****************************************************************************
  84  * Module descriptor
  85  *****************************************************************************/
  86 #define ALPHA_TEXT N_("Alpha blending")
  87 #define ALPHA_LONGTEXT N_("Alpha blending (0 -> 255). Default is 255")
  88
  89 #define HEIGHT_TEXT N_("Height in pixels")
  90 #define WIDTH_TEXT N_("Width in pixels")
  91 #define XOFFSET_TEXT N_("Top left corner x coordinate")
  92 #define YOFFSET_TEXT N_("Top left corner y coordinate")
  93 #define VBORDER_TEXT N_("Vertical border width in pixels")
  94 #define HBORDER_TEXT N_("Horizontal border width in pixels")
  95
  96 #define POS_TEXT N_("Positioning method")
  97 #define POS_LONGTEXT N_("Positioning method. auto : automatically choose " \
  98         "the best number of rows and columns. fixed : use the user-defined " \
  99         "number of rows and columns.")
 100 #define ROWS_TEXT N_("Number of rows")
 101 #define COLS_TEXT N_("Number of columns")
 102 #define AR_TEXT N_("Keep aspect ratio when resizing")
 103 #define KEEP_TEXT N_("Keep original size")
 104
 105 #define ORDER_TEXT N_("Order as a comma separated list of picture-id(s)")
 106
 107 #define DELAY_TEXT N_("Delay")
 108 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
 109         "will be delayed accordingly (in milliseconds, >= 100 ms). For high " \
 110         "values you will need to raise file-caching and others.")
 111
 112 static int pi_pos_values[] = { 0, 1 };
 113 static char * ppsz_pos_descriptions[] =
 114 { N_("auto"), N_("fixed") };
 115
 116
 117 vlc_module_begin();
 118     set_description( N_("Mosaic video sub filter") );
 119     set_shortname( N_("Mosaic") );
 120     set_capability( "sub filter", 0 );
 121     set_callbacks( CreateFilter, DestroyFilter );
 122
 123     add_integer( "mosaic-alpha", 255, NULL, ALPHA_TEXT, ALPHA_LONGTEXT, VLC_FALSE );
 124     add_integer( "mosaic-height", 100, NULL, HEIGHT_TEXT, HEIGHT_TEXT, VLC_FALSE );
 125     add_integer( "mosaic-width", 100, NULL, WIDTH_TEXT, WIDTH_TEXT, VLC_FALSE );
 126     add_integer( "mosaic-xoffset", 0, NULL, XOFFSET_TEXT, XOFFSET_TEXT, VLC_TRUE );
 127     add_integer( "mosaic-yoffset", 0, NULL, YOFFSET_TEXT, YOFFSET_TEXT, VLC_TRUE );
 128     add_integer( "mosaic-vborder", 0, NULL, VBORDER_TEXT, VBORDER_TEXT, VLC_TRUE );
 129     add_integer( "mosaic-hborder", 0, NULL, HBORDER_TEXT, HBORDER_TEXT, VLC_TRUE );
 130
 131     add_integer( "mosaic-position", 0, NULL, POS_TEXT, POS_LONGTEXT, VLC_FALSE );
 132         change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
 133     add_integer( "mosaic-rows", 2, NULL, ROWS_TEXT, ROWS_TEXT, VLC_FALSE );
 134     add_integer( "mosaic-cols", 2, NULL, COLS_TEXT, COLS_TEXT, VLC_FALSE );
 135     add_bool( "mosaic-keep-aspect-ratio", 0, NULL, AR_TEXT, AR_TEXT, VLC_FALSE );
 136     add_bool( "mosaic-keep-picture", 0, NULL, KEEP_TEXT, KEEP_TEXT, VLC_FALSE );
 137     add_string( "mosaic-order", "", NULL, ORDER_TEXT, ORDER_TEXT, VLC_FALSE );
 138
 139     add_integer( "mosaic-delay", 100, NULL, DELAY_TEXT, DELAY_LONGTEXT,
 140                  VLC_FALSE );
 141 vlc_module_end();
 142
 143
 144 /*****************************************************************************
 145  * CreateFiler: allocate mosaic video filter
 146  *****************************************************************************/
 147 static int CreateFilter( vlc_object_t *p_this )
 148 {
 149     filter_t *p_filter = (filter_t *)p_this;
 150     filter_sys_t *p_sys;
 151     libvlc_t *p_libvlc = p_filter->p_libvlc;
 152     char *psz_order;
 153     int i_index;
 154
 155     /* Allocate structure */
 156     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 157     if( p_sys == NULL )
 158     {
 159         msg_Err( p_filter, "out of memory" );
 160         return VLC_ENOMEM;
 161     }
 162
 163     p_filter->pf_sub_filter = Filter;
 164     p_sys->p_pic = NULL;
 165
 166     vlc_mutex_init( p_filter, &p_sys->lock );
 167     vlc_mutex_lock( &p_sys->lock );
 168
 169 #define GET_VAR( name, min, max )                                           \
 170     p_sys->i_##name = __MIN( max, __MAX( min,                               \
 171                 var_CreateGetInteger( p_filter, "mosaic-" #name ) ) );      \
 172     var_Destroy( p_filter, "mosaic-" #name );                               \
 173     var_Create( p_libvlc, "mosaic-" #name, VLC_VAR_INTEGER );               \
 174     var_SetInteger( p_libvlc, "mosaic-" #name, p_sys->i_##name );           \
 175     var_AddCallback( p_libvlc, "mosaic-" #name, MosaicCallback, p_sys );
 176
 177     GET_VAR( width, 0, INT_MAX );
 178     GET_VAR( height, 0, INT_MAX );
 179     GET_VAR( xoffset, 0, INT_MAX );
 180     GET_VAR( yoffset, 0, INT_MAX );
 181     GET_VAR( vborder, 0, INT_MAX );
 182     GET_VAR( hborder, 0, INT_MAX );
 183     GET_VAR( rows, 1, INT_MAX );
 184     GET_VAR( cols, 1, INT_MAX );
 185     GET_VAR( alpha, 0, 255 );
 186     GET_VAR( position, 0, 1 );
 187     GET_VAR( delay, 100, INT_MAX );
 188     p_sys->i_delay *= 1000;
 189
 190     p_sys->b_ar = var_CreateGetBool( p_filter, "mosaic-keep-aspect-ratio" );
 191     var_Destroy( p_filter, "mosaic-keep-aspect-ratio" );
 192     var_Create( p_libvlc, "mosaic-keep-aspect-ratio", VLC_VAR_INTEGER );
 193     var_SetBool( p_libvlc, "mosaic-keep-aspect-ratio", p_sys->b_ar );
 194     var_AddCallback( p_libvlc, "mosaic-keep-aspect-ratio", MosaicCallback,
 195                      p_sys );
 196
 197     p_sys->b_keep = var_CreateGetBool( p_filter, "mosaic-keep-picture" );
 198     if ( !p_sys->b_keep )
 199     {
 200         p_sys->p_image = image_HandlerCreate( p_filter );
 201 #ifdef IMAGE_2PASSES
 202         p_sys->p_image2 = image_HandlerCreate( p_filter );
 203 #endif
 204     }
 205
 206     p_sys->i_order_length = 0;
 207     p_sys->ppsz_order = NULL;
 208     psz_order = var_CreateGetString( p_filter, "mosaic-order" );
 209
 210     if( psz_order[0] != 0 )
 211     {
 212         char *psz_end = NULL;
 213         i_index = 0;
 214         do
 215         {
 216             psz_end = strchr( psz_order, ',' );
 217             i_index++;
 218             p_sys->ppsz_order = realloc( p_sys->ppsz_order,
 219                                          i_index * sizeof(char *) );
 220             p_sys->ppsz_order[i_index - 1] = strndup( psz_order,
 221                                            psz_end - psz_order );
 222             psz_order = psz_end+1;
 223         } while( NULL !=  psz_end );
 224         p_sys->i_order_length = i_index;
 225     }
 226
 227     vlc_mutex_unlock( &p_sys->lock );
 228
 229     vlc_thread_set_priority( p_filter, VLC_THREAD_PRIORITY_OUTPUT );
 230
 231     return VLC_SUCCESS;
 232 }
 233
 234 /*****************************************************************************
 235  * DestroyFilter: destroy mosaic video filter
 236  *****************************************************************************/
 237 static void DestroyFilter( vlc_object_t *p_this )
 238 {
 239     filter_t *p_filter = (filter_t*)p_this;
 240     filter_sys_t *p_sys = p_filter->p_sys;
 241     libvlc_t *p_libvlc = p_filter->p_libvlc;
 242     int i_index;
 243
 244     vlc_mutex_lock( &p_sys->lock );
 245
 246     if( !p_sys->b_keep )
 247     {
 248         image_HandlerDelete( p_sys->p_image );
 249 #ifdef IMAGE_2PASSES
 250         image_HandlerDelete( p_sys->p_image2 );
 251 #endif
 252     }
 253
 254     if( p_sys->i_order_length )
 255     {
 256         for( i_index = 0; i_index < p_sys->i_order_length; i_index++ )
 257         {
 258             free( p_sys->ppsz_order[i_index] );
 259         }
 260         free( p_sys->ppsz_order );
 261     }
 262
 263     var_Destroy( p_libvlc, "mosaic-alpha" );
 264     var_Destroy( p_libvlc, "mosaic-height" );
 265     var_Destroy( p_libvlc, "mosaic-width" );
 266     var_Destroy( p_libvlc, "mosaic-xoffset" );
 267     var_Destroy( p_libvlc, "mosaic-yoffset" );
 268     var_Destroy( p_libvlc, "mosaic-vborder" );
 269     var_Destroy( p_libvlc, "mosaic-hborder" );
 270     var_Destroy( p_libvlc, "mosaic-position" );
 271     var_Destroy( p_libvlc, "mosaic-rows" );
 272     var_Destroy( p_libvlc, "mosaic-cols" );
 273     var_Destroy( p_libvlc, "mosaic-keep-aspect-ratio" );
 274
 275     if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
 276     vlc_mutex_unlock( &p_sys->lock );
 277     vlc_mutex_destroy( &p_sys->lock );
 278     free( p_sys );
 279 }
 280
 281 /*****************************************************************************
 282  * MosaicReleasePicture : Hack to avoid picture duplication
 283  *****************************************************************************/
 284 static void MosaicReleasePicture( picture_t *p_picture )
 285 {
 286     picture_t *p_original_pic = (picture_t *)p_picture->p_sys;
 287
 288     p_original_pic->pf_release( p_original_pic );
 289 }
 290
 291 /*****************************************************************************
 292  * Filter
 293  *****************************************************************************/
 294 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
 295 {
 296     filter_sys_t *p_sys = p_filter->p_sys;
 297     libvlc_t *p_libvlc = p_filter->p_libvlc;
 298
 299     subpicture_t *p_spu;
 300
 301     int i_index, i_real_index, i_row, i_col;
 302     int i_greatest_real_index_used = p_sys->i_order_length - 1;
 303
 304     subpicture_region_t *p_region;
 305     subpicture_region_t *p_region_prev = NULL;
 306
 307     picture_vout_t *p_picture_vout;
 308     vlc_value_t val, lockval;
 309
 310     /* Wait for the specified date. This is to avoid running too fast and
 311      * take twice the same pictures. */
 312     mwait( date - p_sys->i_delay );
 313
 314     if ( var_Get( p_libvlc, "picture-lock", &lockval ) )
 315         return NULL;
 316
 317     vlc_mutex_lock( lockval.p_address );
 318
 319     if( var_Get( p_libvlc, "p_picture_vout", &val ) )
 320     {
 321         vlc_mutex_unlock( lockval.p_address );
 322         return NULL;
 323     }
 324
 325     p_picture_vout = val.p_address;
 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
 341     vlc_mutex_lock( &p_sys->lock );
 342
 343     if( p_sys->i_position == 0 ) /* use automatic positioning */
 344     {
 345         int i_numpics = p_sys->i_order_length; /* keep slots and all */
 346         for( i_index = 0;
 347              i_index < p_picture_vout->i_picture_num;
 348              i_index++ )
 349         {
 350             if( p_picture_vout->p_pic[i_index].i_status
 351                            == PICTURE_VOUT_E_OCCUPIED )
 352             {
 353                 i_numpics ++;
 354                 if( p_sys->i_order_length
 355                     && p_picture_vout->p_pic[i_index].psz_id != 0 )
 356                 {
 357                     /* We also want to leave slots for images given in
 358                      * mosaic-order that are not available in p_vout_picture */
 359                     int i;
 360                     for( i = 0; i < p_sys->i_order_length ; i++ )
 361                     {
 362                         if( !strcmp( p_sys->ppsz_order[i],
 363                                      p_picture_vout->p_pic[i_index].psz_id ) )
 364                         {
 365                             i_numpics--;
 366                             break;
 367                         }
 368                     }
 369
 370                 }
 371             }
 372         }
 373         p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
 374         p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
 375                             i_numpics / p_sys->i_rows :
 376                             i_numpics / p_sys->i_rows + 1 );
 377     }
 378
 379     i_real_index = 0;
 380
 381     for( i_index = 0; i_index < p_picture_vout->i_picture_num; i_index++ )
 382     {
 383         picture_vout_e_t *p_pic = &p_picture_vout->p_pic[i_index];
 384         video_format_t fmt_in = {0}, fmt_out = {0};
 385         picture_t *p_converted;
 386 #ifdef IMAGE_2PASSES
 387         video_format_t fmt_middle = {0};
 388         picture_t *p_middle;
 389 #endif
 390
 391         if( p_pic->i_status == PICTURE_VOUT_E_AVAILABLE
 392              || p_pic->p_picture == NULL )
 393         {
 394             continue;
 395         }
 396
 397         if( p_sys->i_order_length == 0 )
 398         {
 399             i_real_index++;
 400         }
 401         else
 402         {
 403             int i;
 404             for( i = 0; i <= p_sys->i_order_length; i++ )
 405             {
 406                 if( i == p_sys->i_order_length ) break;
 407                 if( strcmp( p_pic->psz_id, p_sys->ppsz_order[i] ) == 0 )
 408                 {
 409                     i_real_index = i;
 410                     break;
 411                 }
 412             }
 413             if( i == p_sys->i_order_length )
 414                 i_real_index = ++i_greatest_real_index_used;
 415         }
 416         i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
 417         i_col = i_real_index % p_sys->i_cols ;
 418
 419         if( !p_sys->b_keep )
 420         {
 421             /* Convert the images */
 422             fmt_in.i_chroma = p_pic->p_picture->format.i_chroma;
 423             fmt_in.i_height = p_pic->p_picture->format.i_height;
 424             fmt_in.i_width = p_pic->p_picture->format.i_width;
 425
 426             fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
 427             fmt_out.i_width = fmt_in.i_width *
 428                 ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 429                   / p_sys->i_cols ) / fmt_in.i_width;
 430             fmt_out.i_height = fmt_in.i_height *
 431                 ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 432                   / p_sys->i_rows ) / fmt_in.i_height;
 433             if( p_sys->b_ar ) /* keep aspect ratio */
 434             {
 435                 if( (float)fmt_out.i_width / (float)fmt_out.i_height
 436                       > (float)fmt_in.i_width / (float)fmt_in.i_height )
 437                 {
 438                     fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
 439                                          / fmt_in.i_height ;
 440                 }
 441                 else
 442                 {
 443                     fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
 444                                         / fmt_in.i_width ;
 445                 }
 446              }
 447
 448             fmt_out.i_visible_width = fmt_out.i_width;
 449             fmt_out.i_visible_height = fmt_out.i_height;
 450
 451 #ifdef IMAGE_2PASSES
 452             fmt_middle.i_chroma = fmt_in.i_chroma;
 453             fmt_middle.i_visible_width = fmt_middle.i_width = fmt_out.i_width;
 454             fmt_middle.i_visible_height = fmt_middle.i_height = fmt_out.i_height;
 455
 456             p_middle = image_Convert( p_sys->p_image2, p_pic->p_picture,
 457                                       &fmt_in, &fmt_middle );
 458             if( !p_middle )
 459             {
 460                 msg_Warn( p_filter, "image resizing failed" );
 461                 continue;
 462             }
 463
 464             p_converted = image_Convert( p_sys->p_image, p_middle,
 465                                          &fmt_middle, &fmt_out );
 466             p_middle->pf_release( p_middle );
 467
 468             if( !p_converted )
 469             {
 470                 msg_Warn( p_filter, "image chroma conversion failed" );
 471                 continue;
 472             }
 473 #else
 474             p_converted = image_Convert( p_sys->p_image, p_pic->p_picture,
 475                                          &fmt_in, &fmt_out );
 476             if( !p_converted )
 477             {
 478                 msg_Warn( p_filter,
 479                            "image resizing and chroma conversion failed" );
 480                 continue;
 481             }
 482 #endif
 483         }
 484         else
 485         {
 486             p_converted = p_pic->p_picture;
 487             p_converted->i_refcount++;
 488             fmt_in.i_width = fmt_out.i_width = p_converted->format.i_width;
 489             fmt_in.i_height = fmt_out.i_height = p_converted->format.i_height;
 490             fmt_in.i_chroma = fmt_out.i_chroma = p_converted->format.i_chroma;
 491             fmt_out.i_visible_width = fmt_out.i_width;
 492             fmt_out.i_visible_height = fmt_out.i_height;
 493         }
 494
 495         p_region = p_spu->pf_make_region( VLC_OBJECT(p_filter), &fmt_out,
 496                                           p_converted );
 497         if( !p_region )
 498         {
 499             msg_Err( p_filter, "cannot allocate SPU region" );
 500             p_filter->pf_sub_buffer_del( p_filter, p_spu );
 501             vlc_mutex_unlock( &p_sys->lock );
 502             vlc_mutex_unlock( lockval.p_address );
 503             return NULL;
 504         }
 505
 506         /* HACK ALERT : let's fix the pointers to avoid picture duplication.
 507          * This is necessary because p_region->picture is not a pointer
 508          * as it ought to be. */
 509         if( !p_sys->b_keep )
 510         {
 511             free( p_converted );
 512         }
 513         else
 514         {
 515             /* Keep a pointer to the original picture (and its refcount...). */
 516             p_region->picture.p_sys = (picture_sys_t *)p_converted;
 517             p_region->picture.pf_release = MosaicReleasePicture;
 518         }
 519
 520         if( p_sys->b_ar || p_sys->b_keep ) /* keep aspect ratio */
 521         {
 522             /* center the video in the dedicated rectangle */
 523             p_region->i_x = p_sys->i_xoffset
 524                         + i_col * ( p_sys->i_width / p_sys->i_cols )
 525                         + ( i_col * p_sys->i_vborder ) / p_sys->i_cols
 526                         + ( ( ( p_sys->i_width
 527                                  - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 528                             / p_sys->i_cols ) - fmt_out.i_width ) / 2;
 529             p_region->i_y = p_sys->i_yoffset
 530                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 531                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows
 532                         + ( ( ( p_sys->i_height
 533                                  - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 534                             / p_sys->i_rows ) - fmt_out.i_height ) / 2;
 535         }
 536         else
 537         {
 538             /* we don't have to center the video since it takes the
 539             whole rectangle area */
 540             p_region->i_x = p_sys->i_xoffset
 541                             + i_col * ( p_sys->i_width / p_sys->i_cols )
 542                             + ( i_col * p_sys->i_vborder ) / p_sys->i_cols;
 543             p_region->i_y = p_sys->i_yoffset
 544                         + i_row * ( p_sys->i_height / p_sys->i_rows )
 545                         + ( i_row * p_sys->i_hborder ) / p_sys->i_rows;
 546         }
 547
 548         if( p_region_prev == NULL )
 549         {
 550             p_spu->p_region = p_region;
 551         }
 552         else
 553         {
 554             p_region_prev->p_next = p_region;
 555         }
 556
 557         p_region_prev = p_region;
 558     }
 559
 560     vlc_mutex_unlock( &p_sys->lock );
 561     vlc_mutex_unlock( lockval.p_address );
 562
 563     return p_spu;
 564 }
 565
 566 /*****************************************************************************
 567 * Callback to update params on the fly
 568 *****************************************************************************/
 569 static int MosaicCallback( vlc_object_t *p_this, char const *psz_var,
 570                             vlc_value_t oldval, vlc_value_t newval,
 571                             void *p_data )
 572 {
 573     filter_sys_t *p_sys = (filter_sys_t *) p_data;
 574     if( !strcmp( psz_var, "mosaic-alpha" ) )
 575     {
 576         vlc_mutex_lock( &p_sys->lock );
 577         msg_Dbg( p_this, "Changing alpha from %d/255 to %d/255",
 578                          p_sys->i_alpha, newval.i_int);
 579         p_sys->i_alpha = __MIN( __MAX( newval.i_int, 0 ), 255 );
 580         vlc_mutex_unlock( &p_sys->lock );
 581     }
 582     else if( !strcmp( psz_var, "mosaic-height" ) )
 583     {
 584         vlc_mutex_lock( &p_sys->lock );
 585         msg_Dbg( p_this, "Changing height from %dpx to %dpx",
 586                           p_sys->i_height, newval.i_int );
 587         p_sys->i_height = __MAX( newval.i_int, 0 );
 588         vlc_mutex_unlock( &p_sys->lock );
 589     }
 590     else if( !strcmp( psz_var, "mosaic-width" ) )
 591     {
 592         vlc_mutex_lock( &p_sys->lock );
 593         msg_Dbg( p_this, "Changing width from %dpx to %dpx",
 594                          p_sys->i_width, newval.i_int );
 595         p_sys->i_width = __MAX( newval.i_int, 0 );
 596         vlc_mutex_unlock( &p_sys->lock );
 597     }
 598     else if( !strcmp( psz_var, "mosaic-xoffset" ) )
 599     {
 600         vlc_mutex_lock( &p_sys->lock );
 601         msg_Dbg( p_this, "Changing x offset from %dpx to %dpx",
 602                          p_sys->i_xoffset, newval.i_int );
 603         p_sys->i_xoffset = __MAX( newval.i_int, 0 );
 604         vlc_mutex_unlock( &p_sys->lock );
 605     }
 606     else if( !strcmp( psz_var, "mosaic-yoffset" ) )
 607     {
 608         vlc_mutex_lock( &p_sys->lock );
 609         msg_Dbg( p_this, "Changing y offset from %dpx to %dpx",
 610                          p_sys->i_yoffset, newval.i_int );
 611         p_sys->i_yoffset = __MAX( newval.i_int, 0 );
 612         vlc_mutex_unlock( &p_sys->lock );
 613     }
 614     else if( !strcmp( psz_var, "mosaic-vborder" ) )
 615     {
 616         vlc_mutex_lock( &p_sys->lock );
 617         msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
 618                          p_sys->i_vborder, newval.i_int );
 619         p_sys->i_vborder = __MAX( newval.i_int, 0 );
 620         vlc_mutex_unlock( &p_sys->lock );
 621     }
 622     else if( !strcmp( psz_var, "mosaic-hborder" ) )
 623     {
 624         vlc_mutex_lock( &p_sys->lock );
 625         msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
 626                          p_sys->i_vborder, newval.i_int );
 627         p_sys->i_hborder = __MAX( newval.i_int, 0 );
 628         vlc_mutex_unlock( &p_sys->lock );
 629     }
 630     else if( !strcmp( psz_var, "mosaic-position" ) )
 631     {
 632         if( newval.i_int > 1 || newval.i_int < 0 )
 633         {
 634             msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
 635         }
 636         else
 637         {
 638             vlc_mutex_lock( &p_sys->lock );
 639             msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
 640                              p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
 641                              newval.i_int, ppsz_pos_descriptions[newval.i_int]);
 642             p_sys->i_position = newval.i_int;
 643             vlc_mutex_unlock( &p_sys->lock );
 644         }
 645     }
 646     else if( !strcmp( psz_var, "mosaic-rows" ) )
 647     {
 648         vlc_mutex_lock( &p_sys->lock );
 649         msg_Dbg( p_this, "Changing number of rows from %d to %d",
 650                          p_sys->i_rows, newval.i_int );
 651         p_sys->i_rows = __MAX( newval.i_int, 1 );
 652         vlc_mutex_unlock( &p_sys->lock );
 653     }
 654     else if( !strcmp( psz_var, "mosaic-cols" ) )
 655     {
 656         vlc_mutex_lock( &p_sys->lock );
 657         msg_Dbg( p_this, "Changing number of columns from %d to %d",
 658                          p_sys->i_cols, newval.i_int );
 659         p_sys->i_cols = __MAX( newval.i_int, 1 );
 660         vlc_mutex_unlock( &p_sys->lock );
 661     }
 662     else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
 663     {
 664         vlc_mutex_lock( &p_sys->lock );
 665         if( newval.i_int )
 666         {
 667             msg_Dbg( p_this, "Keep aspect ratio" );
 668             p_sys->b_ar = 1;
 669         }
 670         else
 671         {
 672             msg_Dbg( p_this, "Don't keep aspect ratio" );
 673             p_sys->b_ar = 0;
 674         }
 675         vlc_mutex_unlock( &p_sys->lock );
 676     }
 677     return VLC_SUCCESS;
 678 }