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     vlc_mutex_t lock;
  57
  58     image_handler_t *p_image;
  59 #ifdef IMAGE_2PASSES
  60     image_handler_t *p_image2;
  61 #endif
  62     picture_t *p_pic;
  63
  64     int i_position; /* mosaic positioning method */
  65     vlc_bool_t b_ar; /* do we keep the aspect ratio ? */
  66     vlc_bool_t b_keep; /* do we keep the original picture format ? */
  67     int i_width, i_height; /* mosaic height and width */
  68     int i_cols, i_rows; /* mosaic rows and cols */
  69     int i_xoffset, i_yoffset; /* top left corner offset */
  70     int i_vborder, i_hborder; /* border width/height between miniatures */
  71     int i_alpha; /* subfilter alpha blending */
  72
  73     char **ppsz_order; /* list of picture-id */
  74     int i_order_length;
  75
  76     mtime_t i_delay;
  77 };
  78
  79 /*****************************************************************************
  80  * Module descriptor
  81  *****************************************************************************/
  82 #define ALPHA_TEXT N_("Alpha blending")
  83 #define ALPHA_LONGTEXT N_("Alpha blending (0 -> 255). Default is 255")
  84
  85 #define HEIGHT_TEXT N_("Height in pixels")
  86 #define WIDTH_TEXT N_("Width in pixels")
  87 #define XOFFSET_TEXT N_("Top left corner x coordinate")
  88 #define YOFFSET_TEXT N_("Top left corner y coordinate")
  89 #define VBORDER_TEXT N_("Vertical border width in pixels")
  90 #define HBORDER_TEXT N_("Horizontal border width in pixels")
  91
  92 #define POS_TEXT N_("Positioning method")
  93 #define POS_LONGTEXT N_("Positioning method. auto : automatically choose " \
  94         "the best number of rows and columns. fixed : use the user-defined " \
  95         "number of rows and columns.")
  96 #define ROWS_TEXT N_("Number of rows")
  97 #define COLS_TEXT N_("Number of columns")
  98 #define AR_TEXT N_("Keep aspect ratio when resizing")
  99 #define KEEP_TEXT N_("Keep original size")
 100
 101 #define ORDER_TEXT N_("Order as a comma separated list of picture-id(s)")
 102
 103 #define DELAY_TEXT N_("Delay")
 104 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
 105         "will be delayed accordingly (in milliseconds, >= 100 ms). For high " \
 106         "values you will need to raise file-caching and others.")
 107
 108 static int pi_pos_values[] = { 0, 1 };
 109 static char * ppsz_pos_descriptions[] =
 110 { N_("auto"), N_("fixed") };
 111
 112
 113 vlc_module_begin();
 114     set_description( N_("Mosaic video sub filter") );
 115     set_shortname( N_("Mosaic") );
 116     set_capability( "sub filter", 0 );
 117     set_callbacks( CreateFilter, DestroyFilter );
 118
 119     add_integer( "mosaic-alpha", 255, NULL, ALPHA_TEXT, ALPHA_LONGTEXT, VLC_FALSE );
 120     add_integer( "mosaic-height", 100, NULL, HEIGHT_TEXT, HEIGHT_TEXT, VLC_FALSE );
 121     add_integer( "mosaic-width", 100, NULL, WIDTH_TEXT, WIDTH_TEXT, VLC_FALSE );
 122     add_integer( "mosaic-xoffset", 0, NULL, XOFFSET_TEXT, XOFFSET_TEXT, VLC_TRUE );
 123     add_integer( "mosaic-yoffset", 0, NULL, YOFFSET_TEXT, YOFFSET_TEXT, VLC_TRUE );
 124     add_integer( "mosaic-vborder", 0, NULL, VBORDER_TEXT, VBORDER_TEXT, VLC_TRUE );
 125     add_integer( "mosaic-hborder", 0, NULL, HBORDER_TEXT, HBORDER_TEXT, VLC_TRUE );
 126
 127     add_integer( "mosaic-position", 0, NULL, POS_TEXT, POS_LONGTEXT, VLC_FALSE );
 128         change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
 129     add_integer( "mosaic-rows", 2, NULL, ROWS_TEXT, ROWS_TEXT, VLC_FALSE );
 130     add_integer( "mosaic-cols", 2, NULL, COLS_TEXT, COLS_TEXT, VLC_FALSE );
 131     add_bool( "mosaic-keep-aspect-ratio", 0, NULL, AR_TEXT, AR_TEXT, VLC_FALSE );
 132     add_bool( "mosaic-keep-picture", 0, NULL, KEEP_TEXT, KEEP_TEXT, VLC_FALSE );
 133     add_string( "mosaic-order", "", NULL, ORDER_TEXT, ORDER_TEXT, VLC_FALSE );
 134
 135     add_integer( "mosaic-delay", 100, NULL, DELAY_TEXT, DELAY_LONGTEXT,
 136                  VLC_FALSE );
 137 vlc_module_end();
 138
 139
 140 /*****************************************************************************
 141  * CreateFiler: allocate mosaic video filter
 142  *****************************************************************************/
 143 static int CreateFilter( vlc_object_t *p_this )
 144 {
 145     filter_t *p_filter = (filter_t *)p_this;
 146     filter_sys_t *p_sys;
 147     libvlc_t *p_libvlc = p_filter->p_libvlc;
 148     char *psz_order;
 149     int i_index;
 150
 151     /* Allocate structure */
 152     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 153     if( p_sys == NULL )
 154     {
 155         msg_Err( p_filter, "out of memory" );
 156         return VLC_ENOMEM;
 157     }
 158
 159     p_filter->pf_sub_filter = Filter;
 160     p_sys->p_pic = NULL;
 161
 162     vlc_mutex_init( p_filter, &p_sys->lock );
 163     vlc_mutex_lock( &p_sys->lock );
 164
 165 #define GET_VAR( name, min, max )                                           \
 166     p_sys->i_##name = __MIN( max, __MAX( min,                               \
 167                 var_CreateGetInteger( p_filter, "mosaic-" #name ) ) );      \
 168     var_Destroy( p_filter, "mosaic-" #name );                               \
 169     var_Create( p_libvlc, "mosaic-" #name, VLC_VAR_INTEGER );               \
 170     var_SetInteger( p_libvlc, "mosaic-" #name, p_sys->i_##name );           \
 171     var_AddCallback( p_libvlc, "mosaic-" #name, MosaicCallback, p_sys );
 172
 173     GET_VAR( width, 0, INT_MAX );
 174     GET_VAR( height, 0, INT_MAX );
 175     GET_VAR( xoffset, 0, INT_MAX );
 176     GET_VAR( yoffset, 0, INT_MAX );
 177     GET_VAR( vborder, 0, INT_MAX );
 178     GET_VAR( hborder, 0, INT_MAX );
 179     GET_VAR( rows, 1, INT_MAX );
 180     GET_VAR( cols, 1, INT_MAX );
 181     GET_VAR( alpha, 0, 255 );
 182     GET_VAR( position, 0, 1 );
 183     GET_VAR( delay, 100, INT_MAX );
 184     p_sys->i_delay *= 1000;
 185
 186     p_sys->b_ar = var_CreateGetBool( p_filter, "mosaic-keep-aspect-ratio" );
 187     var_Destroy( p_filter, "mosaic-keep-aspect-ratio" );
 188     var_Create( p_libvlc, "mosaic-keep-aspect-ratio", VLC_VAR_INTEGER );
 189     var_SetBool( p_libvlc, "mosaic-keep-aspect-ratio", p_sys->b_ar );
 190     var_AddCallback( p_libvlc, "mosaic-keep-aspect-ratio", MosaicCallback,
 191                      p_sys );
 192
 193     p_sys->b_keep = var_CreateGetBool( p_filter, "mosaic-keep-picture" );
 194     if ( !p_sys->b_keep )
 195     {
 196         p_sys->p_image = image_HandlerCreate( p_filter );
 197 #ifdef IMAGE_2PASSES
 198         p_sys->p_image2 = image_HandlerCreate( p_filter );
 199 #endif
 200     }
 201
 202     p_sys->i_order_length = 0;
 203     p_sys->ppsz_order = NULL;
 204     psz_order = var_CreateGetString( p_filter, "mosaic-order" );
 205
 206     if( psz_order[0] != 0 )
 207     {
 208         char *psz_end = NULL;
 209         i_index = 0;
 210         do
 211         {
 212             psz_end = strchr( psz_order, ',' );
 213             i_index++;
 214             p_sys->ppsz_order = realloc( p_sys->ppsz_order,
 215                                          i_index * sizeof(char *) );
 216             p_sys->ppsz_order[i_index - 1] = strndup( psz_order,
 217                                            psz_end - psz_order );
 218             psz_order = psz_end+1;
 219         } while( NULL !=  psz_end );
 220         p_sys->i_order_length = i_index;
 221     }
 222
 223     vlc_mutex_unlock( &p_sys->lock );
 224
 225     vlc_thread_set_priority( p_filter, VLC_THREAD_PRIORITY_OUTPUT );
 226
 227     return VLC_SUCCESS;
 228 }
 229
 230 /*****************************************************************************
 231  * DestroyFilter: destroy mosaic video filter
 232  *****************************************************************************/
 233 static void DestroyFilter( vlc_object_t *p_this )
 234 {
 235     filter_t *p_filter = (filter_t*)p_this;
 236     filter_sys_t *p_sys = p_filter->p_sys;
 237     libvlc_t *p_libvlc = p_filter->p_libvlc;
 238     int i_index;
 239
 240     vlc_mutex_lock( &p_sys->lock );
 241
 242     if( !p_sys->b_keep )
 243     {
 244         image_HandlerDelete( p_sys->p_image );
 245 #ifdef IMAGE_2PASSES
 246         image_HandlerDelete( p_sys->p_image2 );
 247 #endif
 248     }
 249
 250     if( p_sys->i_order_length )
 251     {
 252         for( i_index = 0; i_index < p_sys->i_order_length; i_index++ )
 253         {
 254             free( p_sys->ppsz_order[i_index] );
 255         }
 256         free( p_sys->ppsz_order );
 257     }
 258
 259     var_Destroy( p_libvlc, "mosaic-alpha" );
 260     var_Destroy( p_libvlc, "mosaic-height" );
 261     var_Destroy( p_libvlc, "mosaic-width" );
 262     var_Destroy( p_libvlc, "mosaic-xoffset" );
 263     var_Destroy( p_libvlc, "mosaic-yoffset" );
 264     var_Destroy( p_libvlc, "mosaic-vborder" );
 265     var_Destroy( p_libvlc, "mosaic-hborder" );
 266     var_Destroy( p_libvlc, "mosaic-position" );
 267     var_Destroy( p_libvlc, "mosaic-rows" );
 268     var_Destroy( p_libvlc, "mosaic-cols" );
 269     var_Destroy( p_libvlc, "mosaic-keep-aspect-ratio" );
 270
 271     if( p_sys->p_pic ) p_sys->p_pic->pf_release( p_sys->p_pic );
 272     vlc_mutex_unlock( &p_sys->lock );
 273     vlc_mutex_destroy( &p_sys->lock );
 274     free( p_sys );
 275 }
 276
 277 /*****************************************************************************
 278  * MosaicReleasePicture : Hack to avoid picture duplication
 279  *****************************************************************************/
 280 static void MosaicReleasePicture( picture_t *p_picture )
 281 {
 282     picture_t *p_original_pic = (picture_t *)p_picture->p_sys;
 283
 284     p_original_pic->pf_release( p_original_pic );
 285 }
 286
 287 /*****************************************************************************
 288  * Filter
 289  *****************************************************************************/
 290 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
 291 {
 292     filter_sys_t *p_sys = p_filter->p_sys;
 293     libvlc_t *p_libvlc = p_filter->p_libvlc;
 294
 295     subpicture_t *p_spu;
 296
 297     int i_index, i_real_index, i_row, i_col;
 298     int i_greatest_real_index_used = p_sys->i_order_length - 1;
 299
 300     subpicture_region_t *p_region;
 301     subpicture_region_t *p_region_prev = NULL;
 302
 303     picture_vout_t *p_picture_vout;
 304     vlc_value_t val, lockval;
 305
 306     /* Wait for the specified date. This is to avoid running too fast and
 307      * take twice the same pictures. */
 308     mwait( date - p_sys->i_delay );
 309
 310     if ( var_Get( p_libvlc, "picture-lock", &lockval ) )
 311         return NULL;
 312
 313     vlc_mutex_lock( lockval.p_address );
 314
 315     if( var_Get( p_libvlc, "p_picture_vout", &val ) )
 316     {
 317         vlc_mutex_unlock( lockval.p_address );
 318         return NULL;
 319     }
 320
 321     p_picture_vout = val.p_address;
 322
 323     /* Allocate the subpicture internal data. */
 324     p_spu = p_filter->pf_sub_buffer_new( p_filter );
 325     if( !p_spu )
 326     {
 327         return NULL;
 328     }
 329
 330     /* Initialize subpicture */
 331     p_spu->i_channel = 0;
 332     p_spu->i_start  = date;
 333     p_spu->i_stop = 0;
 334     p_spu->b_ephemer = VLC_TRUE;
 335     p_spu->i_alpha = p_sys->i_alpha;
 336
 337     vlc_mutex_lock( &p_sys->lock );
 338
 339     if( p_sys->i_position == 0 ) /* use automatic positioning */
 340     {
 341         int i_numpics = p_sys->i_order_length; /* keep slots and all */
 342         for( i_index = 0;
 343              i_index < p_picture_vout->i_picture_num;
 344              i_index++ )
 345         {
 346             if( p_picture_vout->p_pic[i_index].i_status
 347                            == PICTURE_VOUT_E_OCCUPIED )
 348             {
 349                 i_numpics ++;
 350                 if( p_sys->i_order_length
 351                     && p_picture_vout->p_pic[i_index].psz_id != 0 )
 352                 {
 353                     /* We also want to leave slots for images given in
 354                      * mosaic-order that are not available in p_vout_picture */
 355                     int i;
 356                     for( i = 0; i < p_sys->i_order_length ; i++ )
 357                     {
 358                         if( !strcmp( p_sys->ppsz_order[i],
 359                                      p_picture_vout->p_pic[i_index].psz_id ) )
 360                         {
 361                             i_numpics--;
 362                             break;
 363                         }
 364                     }
 365
 366                 }
 367             }
 368         }
 369         p_sys->i_rows = ((int)ceil(sqrt( (float)i_numpics )));
 370         p_sys->i_cols = ( i_numpics % p_sys->i_rows == 0 ?
 371                             i_numpics / p_sys->i_rows :
 372                             i_numpics / p_sys->i_rows + 1 );
 373     }
 374
 375     i_real_index = 0;
 376
 377     for( i_index = 0; i_index < p_picture_vout->i_picture_num; i_index++ )
 378     {
 379         picture_vout_e_t *p_pic = &p_picture_vout->p_pic[i_index];
 380         video_format_t fmt_in = {0}, fmt_out = {0};
 381         picture_t *p_converted;
 382 #ifdef IMAGE_2PASSES
 383         video_format_t fmt_middle = {0};
 384         picture_t *p_middle;
 385 #endif
 386
 387         if( p_pic->i_status == PICTURE_VOUT_E_AVAILABLE
 388              || p_pic->p_picture == NULL )
 389         {
 390             continue;
 391         }
 392
 393         if( p_sys->i_order_length == 0 )
 394         {
 395             i_real_index++;
 396         }
 397         else
 398         {
 399             int i;
 400             for( i = 0; i <= p_sys->i_order_length; i++ )
 401             {
 402                 if( i == p_sys->i_order_length ) break;
 403                 if( strcmp( p_pic->psz_id, p_sys->ppsz_order[i] ) == 0 )
 404                 {
 405                     i_real_index = i;
 406                     break;
 407                 }
 408             }
 409             if( i == p_sys->i_order_length )
 410                 i_real_index = ++i_greatest_real_index_used;
 411         }
 412         i_row = ( i_real_index / p_sys->i_cols ) % p_sys->i_rows;
 413         i_col = i_real_index % p_sys->i_cols ;
 414
 415         if( !p_sys->b_keep )
 416         {
 417             /* Convert the images */
 418             fmt_in.i_chroma = p_pic->p_picture->format.i_chroma;
 419             fmt_in.i_height = p_pic->p_picture->format.i_height;
 420             fmt_in.i_width = p_pic->p_picture->format.i_width;
 421
 422             fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
 423             fmt_out.i_width = fmt_in.i_width *
 424                 ( ( p_sys->i_width - ( p_sys->i_cols - 1 ) * p_sys->i_vborder )
 425                   / p_sys->i_cols ) / fmt_in.i_width;
 426             fmt_out.i_height = fmt_in.i_height *
 427                 ( ( p_sys->i_height - ( p_sys->i_rows - 1 ) * p_sys->i_hborder )
 428                   / p_sys->i_rows ) / fmt_in.i_height;
 429             if( p_sys->b_ar ) /* keep aspect ratio */
 430             {
 431                 if( (float)fmt_out.i_width / (float)fmt_out.i_height
 432                       > (float)fmt_in.i_width / (float)fmt_in.i_height )
 433                 {
 434                     fmt_out.i_width = ( fmt_out.i_height * fmt_in.i_width )
 435                                          / fmt_in.i_height ;
 436                 }
 437                 else
 438                 {
 439                     fmt_out.i_height = ( fmt_out.i_width * fmt_in.i_height )
 440                                         / fmt_in.i_width ;
 441                 }
 442              }
 443
 444             fmt_out.i_visible_width = fmt_out.i_width;
 445             fmt_out.i_visible_height = fmt_out.i_height;
 446
 447 #ifdef IMAGE_2PASSES
 448             fmt_middle.i_chroma = fmt_in.i_chroma;
 449             fmt_middle.i_visible_width = fmt_middle.i_width = fmt_out.i_width;
 450             fmt_middle.i_visible_height = fmt_middle.i_height = fmt_out.i_height;
 451
 452             p_middle = image_Convert( p_sys->p_image2, p_pic->p_picture,
 453                                       &fmt_in, &fmt_middle );
 454             if( !p_middle )
 455             {
 456                 msg_Warn( p_filter, "image resizing failed" );
 457                 continue;
 458             }
 459
 460             p_converted = image_Convert( p_sys->p_image, p_middle,
 461                                          &fmt_middle, &fmt_out );
 462             p_middle->pf_release( p_middle );
 463
 464             if( !p_converted )
 465             {
 466                 msg_Warn( p_filter, "image chroma conversion failed" );
 467                 continue;
 468             }
 469 #else
 470             p_converted = image_Convert( p_sys->p_image, p_pic->p_picture,
 471                                          &fmt_in, &fmt_out );
 472             if( !p_converted )
 473             {
 474                 msg_Warn( p_filter,
 475                            "image resizing and chroma conversion failed" );
 476                 continue;
 477             }
 478 #endif
 479         }
 480         else
 481         {
 482             p_converted = p_pic->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( lockval.p_address );
 499             return NULL;
 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->lock );
 557     vlc_mutex_unlock( lockval.p_address );
 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-vborder" ) )
 611     {
 612         vlc_mutex_lock( &p_sys->lock );
 613         msg_Dbg( p_this, "Changing vertical border from %dpx to %dpx",
 614                          p_sys->i_vborder, newval.i_int );
 615         p_sys->i_vborder = __MAX( newval.i_int, 0 );
 616         vlc_mutex_unlock( &p_sys->lock );
 617     }
 618     else if( !strcmp( psz_var, "mosaic-hborder" ) )
 619     {
 620         vlc_mutex_lock( &p_sys->lock );
 621         msg_Dbg( p_this, "Changing horizontal border from %dpx to %dpx",
 622                          p_sys->i_vborder, newval.i_int );
 623         p_sys->i_hborder = __MAX( newval.i_int, 0 );
 624         vlc_mutex_unlock( &p_sys->lock );
 625     }
 626     else if( !strcmp( psz_var, "mosaic-position" ) )
 627     {
 628         if( newval.i_int > 1 || newval.i_int < 0 )
 629         {
 630             msg_Err( p_this, "Position is either 0 (auto) or 1 (fixed)" );
 631         }
 632         else
 633         {
 634             vlc_mutex_lock( &p_sys->lock );
 635             msg_Dbg( p_this, "Changing position method from %d (%s) to %d (%s)",
 636                              p_sys->i_position, ppsz_pos_descriptions[p_sys->i_position],
 637                              newval.i_int, ppsz_pos_descriptions[newval.i_int]);
 638             p_sys->i_position = newval.i_int;
 639             vlc_mutex_unlock( &p_sys->lock );
 640         }
 641     }
 642     else if( !strcmp( psz_var, "mosaic-rows" ) )
 643     {
 644         vlc_mutex_lock( &p_sys->lock );
 645         msg_Dbg( p_this, "Changing number of rows from %d to %d",
 646                          p_sys->i_rows, newval.i_int );
 647         p_sys->i_rows = __MAX( newval.i_int, 1 );
 648         vlc_mutex_unlock( &p_sys->lock );
 649     }
 650     else if( !strcmp( psz_var, "mosaic-cols" ) )
 651     {
 652         vlc_mutex_lock( &p_sys->lock );
 653         msg_Dbg( p_this, "Changing number of columns from %d to %d",
 654                          p_sys->i_cols, newval.i_int );
 655         p_sys->i_cols = __MAX( newval.i_int, 1 );
 656         vlc_mutex_unlock( &p_sys->lock );
 657     }
 658     else if( !strcmp( psz_var, "mosaic-keep-aspect-ratio" ) )
 659     {
 660         vlc_mutex_lock( &p_sys->lock );
 661         if( newval.i_int )
 662         {
 663             msg_Dbg( p_this, "Keep aspect ratio" );
 664             p_sys->b_ar = 1;
 665         }
 666         else
 667         {
 668             msg_Dbg( p_this, "Don't keep aspect ratio" );
 669             p_sys->b_ar = 0;
 670         }
 671         vlc_mutex_unlock( &p_sys->lock );
 672     }
 673     return VLC_SUCCESS;
 674 }