git.sesse.net Git - vlc/blob - modules/video_filter/motiondetect.c

   1 /*****************************************************************************
   2  * motiondetec.c : Second version of a motion detection plugin.
   3  *****************************************************************************
   4  * Copyright (C) 2000-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_sout.h>
  35 #include <vlc_vout.h>
  36
  37 #include "vlc_filter.h"
  38 #include "filter_picture.h"
  39
  40 /*****************************************************************************
  41  * Module descriptor
  42  *****************************************************************************/
  43 static int  Create    ( vlc_object_t * );
  44 static void Destroy   ( vlc_object_t * );
  45
  46 #define FILTER_PREFIX "motiondetect-"
  47
  48 vlc_module_begin ()
  49     set_description( N_("Motion detect video filter") )
  50     set_shortname( N_( "Motion Detect" ))
  51     set_category( CAT_VIDEO )
  52     set_subcategory( SUBCAT_VIDEO_VFILTER )
  53     set_capability( "video filter2", 0 )
  54
  55     add_shortcut( "motion" )
  56     set_callbacks( Create, Destroy )
  57 vlc_module_end ()
  58
  59
  60 /*****************************************************************************
  61  * Local prototypes
  62  *****************************************************************************/
  63 static picture_t *Filter( filter_t *, picture_t * );
  64 static picture_t *FilterPacked( filter_t *, picture_t * );
  65 static void GaussianConvolution( uint32_t *, uint32_t *, int, int, int );
  66 static int FindShapes( uint32_t *, uint32_t *, int, int, int,
  67                        int *, int *, int *, int *, int *);
  68 static void Draw( filter_t *p_filter, uint8_t *p_pix, int i_pix_pitch, int i_pix_size );
  69 #define NUM_COLORS (5000)
  70
  71 struct filter_sys_t
  72 {
  73     bool b_old;
  74     picture_t *p_old;
  75     uint32_t *p_buf;
  76     uint32_t *p_buf2;
  77
  78     /* */
  79     int i_colors;
  80     int colors[NUM_COLORS];
  81     int color_x_min[NUM_COLORS];
  82     int color_x_max[NUM_COLORS];
  83     int color_y_min[NUM_COLORS];
  84     int color_y_max[NUM_COLORS];
  85 };
  86
  87 /*****************************************************************************
  88  * Create
  89  *****************************************************************************/
  90 static int Create( vlc_object_t *p_this )
  91 {
  92     filter_t *p_filter = (filter_t *)p_this;
  93     const video_format_t *p_fmt = &p_filter->fmt_in.video;
  94     filter_sys_t *p_sys;
  95
  96     switch( p_fmt->i_chroma )
  97     {
  98         CASE_PLANAR_YUV
  99             p_filter->pf_video_filter = Filter;
 100             break;
 101
 102         CASE_PACKED_YUV_422
 103             p_filter->pf_video_filter = FilterPacked;
 104             break;
 105
 106         default:
 107             msg_Err( p_filter, "Unsupported input chroma (%4s)",
 108                      (char*)&(p_fmt->i_chroma) );
 109             return VLC_EGENERIC;
 110     }
 111
 112     /* Allocate structure */
 113     p_filter->p_sys = p_sys = malloc( sizeof( filter_sys_t ) );
 114     if( p_filter->p_sys == NULL )
 115         return VLC_ENOMEM;
 116
 117     p_sys->b_old = false;
 118     p_sys->p_old = picture_New( p_fmt->i_chroma,
 119                                 p_fmt->i_width, p_fmt->i_height, 0 );
 120     p_sys->p_buf  = calloc( p_fmt->i_width * p_fmt->i_height, sizeof(*p_sys->p_buf) );
 121     p_sys->p_buf2 = calloc( p_fmt->i_width * p_fmt->i_height, sizeof(*p_sys->p_buf) );
 122
 123     if( !p_sys->p_old || !p_sys->p_buf || !p_sys->p_buf2 )
 124     {
 125         free( p_sys->p_buf2 );
 126         free( p_sys->p_buf );
 127         if( p_sys->p_old )
 128             picture_Release( p_sys->p_old );
 129         return VLC_ENOMEM;
 130     }
 131
 132     return VLC_SUCCESS;
 133 }
 134
 135 /*****************************************************************************
 136  * Destroy
 137  *****************************************************************************/
 138 static void Destroy( vlc_object_t *p_this )
 139 {
 140     filter_t *p_filter = (filter_t *)p_this;
 141     filter_sys_t *p_sys = p_filter->p_sys;
 142
 143     free( p_sys->p_buf2 );
 144     free( p_sys->p_buf );
 145     picture_Release( p_sys->p_old );
 146     free( p_sys );
 147 }
 148
 149
 150 /*****************************************************************************
 151  * Filter YUV Planar
 152  *****************************************************************************/
 153 static picture_t *Filter( filter_t *p_filter, picture_t *p_inpic )
 154 {
 155     filter_sys_t *p_sys = p_filter->p_sys;
 156     const video_format_t *p_fmt = &p_filter->fmt_in.video;
 157
 158     picture_t *p_outpic;
 159
 160     uint8_t *p_oldpix   = p_sys->p_old->p[Y_PLANE].p_pixels;
 161     const int i_old_pitch = p_sys->p_old->p[Y_PLANE].i_pitch;
 162     uint32_t *p_buf = p_sys->p_buf;
 163     uint32_t *p_buf2= p_sys->p_buf2;
 164
 165     unsigned x, y;
 166
 167     if( !p_inpic )
 168         return NULL;
 169
 170     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 171     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 172
 173     if( !p_sys->b_old )
 174     {
 175         picture_Copy( p_sys->p_old, p_inpic );
 176         p_sys->b_old = true;
 177         return p_inpic;
 178     }
 179
 180     p_outpic = filter_NewPicture( p_filter );
 181     if( !p_outpic )
 182     {
 183         picture_Release( p_inpic );
 184         return NULL;
 185     }
 186     picture_Copy( p_outpic, p_inpic );
 187
 188     /**
 189      * Substract Y planes
 190      */
 191     for( y = 0; y < p_fmt->i_height; y++ )
 192     {
 193         for( x = 0; x < p_fmt->i_width; x++ )
 194             p_buf2[y*p_fmt->i_width+x] = abs( p_inpix[y*i_src_pitch+x] - p_oldpix[y*i_old_pitch+x] );
 195     }
 196
 197     int i_chroma_dx;
 198     int i_chroma_dy;
 199     switch( p_inpic->format.i_chroma )
 200     {
 201         case VLC_CODEC_I420:
 202         case VLC_CODEC_J420:
 203         case VLC_CODEC_YV12:
 204             i_chroma_dx = 2;
 205             i_chroma_dy = 2;
 206             break;
 207
 208         case VLC_CODEC_I422:
 209         case VLC_CODEC_J422:
 210             i_chroma_dx = 2;
 211             i_chroma_dy = 1;
 212             break;
 213
 214         default:
 215             msg_Warn( p_filter, "Not taking chroma into account" );
 216             i_chroma_dx = 0;
 217             i_chroma_dy = 0;
 218             break;
 219     }
 220
 221     if( i_chroma_dx != 0 && i_chroma_dy != 0 )
 222     {
 223         const uint8_t *p_inpix_u = p_inpic->p[U_PLANE].p_pixels;
 224         const uint8_t *p_inpix_v = p_inpic->p[V_PLANE].p_pixels;
 225         const int i_src_pitch_u = p_inpic->p[U_PLANE].i_pitch;
 226         const int i_src_pitch_v = p_inpic->p[V_PLANE].i_pitch;
 227
 228         const uint8_t *p_oldpix_u = p_sys->p_old->p[U_PLANE].p_pixels;
 229         const uint8_t *p_oldpix_v = p_sys->p_old->p[V_PLANE].p_pixels;
 230         const int i_old_pitch_u = p_sys->p_old->p[U_PLANE].i_pitch;
 231         const int i_old_pitch_v = p_sys->p_old->p[V_PLANE].i_pitch;
 232
 233         for( y = 0; y < p_fmt->i_height/i_chroma_dy; y++ )
 234         {
 235             for( x = 0; x < p_fmt->i_width/i_chroma_dx; x ++ )
 236             {
 237                 const int d = abs( p_inpix_u[y*i_src_pitch_u+x] - p_oldpix_u[y*i_old_pitch_u+x] ) +
 238                               abs( p_inpix_v[y*i_src_pitch_v+x] - p_oldpix_v[y*i_old_pitch_v+x] );
 239                 int i, j;
 240
 241                 for( j = 0; j < i_chroma_dy; j++ )
 242                 {
 243                     for( i = 0; i < i_chroma_dx; i++ )
 244                         p_buf2[i_chroma_dy*p_fmt->i_width*j + i_chroma_dx*i] = d;
 245                 }
 246             }
 247         }
 248     }
 249
 250     /**
 251      * Get the areas where movement was detected
 252      */
 253     p_sys->i_colors = FindShapes( p_buf2, p_buf, p_fmt->i_width, p_fmt->i_width, p_fmt->i_height,
 254                                   p_sys->colors, p_sys->color_x_min, p_sys->color_x_max, p_sys->color_y_min, p_sys->color_y_max );
 255
 256     /**
 257      * Count final number of shapes
 258      * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
 259      */
 260     Draw( p_filter, p_outpic->p[Y_PLANE].p_pixels, p_outpic->p[Y_PLANE].i_pitch, 1 );
 261
 262     /**
 263      * We're done. Lets keep a copy of the picture
 264      * TODO we may just picture_Release with a latency of 1 if the filters/vout
 265      * handle it correctly */
 266     picture_Copy( p_sys->p_old, p_inpic );
 267
 268     picture_Release( p_inpic );
 269     return p_outpic;
 270 }
 271
 272 /*****************************************************************************
 273  * Filter YUV Packed
 274  *****************************************************************************/
 275 static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_inpic )
 276 {
 277     filter_sys_t *p_sys = p_filter->p_sys;
 278     const video_format_t *p_fmt = &p_filter->fmt_in.video;
 279     picture_t *p_outpic;
 280
 281     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 282     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 283
 284     uint8_t *p_oldpix   = p_sys->p_old->p[Y_PLANE].p_pixels;
 285     const int i_old_pitch = p_sys->p_old->p[Y_PLANE].i_pitch;
 286     uint32_t *p_buf = p_sys->p_buf;
 287     uint32_t *p_buf2= p_sys->p_buf2;
 288
 289     int i_y_offset, i_u_offset, i_v_offset;
 290
 291     unsigned x, y;
 292
 293     if( GetPackedYuvOffsets( p_fmt->i_chroma,
 294                              &i_y_offset, &i_u_offset, &i_v_offset ) )
 295     {
 296         msg_Warn( p_filter, "Unsupported input chroma (%4s)",
 297                   (char*)&p_fmt->i_chroma );
 298         return p_inpic;
 299     }
 300
 301     if( !p_sys->b_old )
 302     {
 303         picture_Copy( p_sys->p_old, p_inpic );
 304         p_sys->b_old = true;
 305         return p_inpic;
 306     }
 307
 308     p_outpic = filter_NewPicture( p_filter );
 309     if( !p_outpic )
 310     {
 311         picture_Release( p_inpic );
 312         return NULL;
 313     }
 314     picture_Copy( p_outpic, p_inpic );
 315
 316     /* Substract all planes at once */
 317
 318     for( y = 0; y < p_fmt->i_height; y++ )
 319     {
 320         for( x = 0; x < p_fmt->i_width; x+=2 )
 321         {
 322             int i;
 323             int d;
 324
 325             d = abs( p_inpix[y*i_src_pitch+2*x+i_u_offset] - p_oldpix[y*i_old_pitch+2*x+i_u_offset] ) +
 326                 abs( p_inpix[y*i_src_pitch+2*x+i_v_offset] - p_oldpix[y*i_old_pitch+2*x+i_v_offset] );
 327
 328             for( i = 0; i < 2; i++ )
 329                 p_buf2[y*p_fmt->i_width+x+i] =
 330                     abs( p_inpix[y*i_src_pitch+2*(x+i)+i_y_offset] - p_oldpix[y*i_old_pitch+2*(x+i)+i_y_offset] ) + d;
 331         }
 332     }
 333
 334     /**
 335      * Get the areas where movement was detected
 336      */
 337     p_sys->i_colors = FindShapes( p_buf2, p_buf, p_fmt->i_width, p_fmt->i_width, p_fmt->i_height,
 338                                   p_sys->colors, p_sys->color_x_min, p_sys->color_x_max, p_sys->color_y_min, p_sys->color_y_max );
 339
 340     /**
 341      * Count final number of shapes
 342      * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
 343      */
 344     Draw( p_filter, &p_outpic->p[Y_PLANE].p_pixels[i_y_offset], p_outpic->p[Y_PLANE].i_pitch, 2 );
 345
 346     /**
 347      * We're done. Lets keep a copy of the picture
 348      * TODO we may just picture_Release with a latency of 1 if the filters/vout
 349      * handle it correctly */
 350     picture_Copy( p_sys->p_old, p_inpic );
 351
 352     picture_Release( p_inpic );
 353     return p_outpic;
 354 }
 355
 356
 357
 358 /*****************************************************************************
 359  * Gaussian Convolution
 360  *****************************************************************************
 361  *    Gaussian convolution ( sigma == 1.4 )
 362  *
 363  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 364  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 365  *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 366  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 367  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 368  *****************************************************************************/
 369 static void GaussianConvolution( uint32_t *p_inpix, uint32_t *p_smooth,
 370                                  int i_src_pitch, int i_num_lines,
 371                                  int i_src_visible )
 372 {
 373     int x,y;
 374
 375     /* A bit overkill but ... simpler */
 376     memset( p_smooth, 0, sizeof(*p_smooth) * i_src_pitch * i_num_lines );
 377
 378     for( y = 2; y < i_num_lines - 2; y++ )
 379     {
 380         for( x = 2; x < i_src_visible - 2; x++ )
 381         {
 382             p_smooth[y*i_src_visible+x] = (uint32_t)(
 383               /* 2 rows up */
 384                 ( p_inpix[(y-2)*i_src_pitch+x-2] )
 385               + ((p_inpix[(y-2)*i_src_pitch+x-1]
 386               +   p_inpix[(y-2)*i_src_pitch+x]
 387               +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 388               + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 389               /* 1 row up */
 390               + ((p_inpix[(y-1)*i_src_pitch+x-2]
 391               + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 392               + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 393               + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 394               +   p_inpix[(y-1)*i_src_pitch+x+2]
 395               /* */
 396               +   p_inpix[y*i_src_pitch+x-2]
 397               + ( p_inpix[y*i_src_pitch+x-1]*3 )
 398               + ( p_inpix[y*i_src_pitch+x]<<2 )
 399               + ( p_inpix[y*i_src_pitch+x+1]*3 )
 400               +   p_inpix[y*i_src_pitch+x+2]
 401               /* 1 row down */
 402               +   p_inpix[(y+1)*i_src_pitch+x-2]
 403               + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 404               + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 405               + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 406               +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 407               /* 2 rows down */
 408               + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 409               + ((p_inpix[(y+2)*i_src_pitch+x-1]
 410               +   p_inpix[(y+2)*i_src_pitch+x]
 411               +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 412               + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 413               ) >> 6 /* 115 */;
 414         }
 415     }
 416 }
 417
 418 /*****************************************************************************
 419  *
 420  *****************************************************************************/
 421 static int FindShapes( uint32_t *p_diff, uint32_t *p_smooth,
 422                        int i_pitch, int i_visible, int i_lines,
 423                        int *colors,
 424                        int *color_x_min, int *color_x_max,
 425                        int *color_y_min, int *color_y_max )
 426 {
 427     int last = 1;
 428     int i, j;
 429
 430     /**
 431      * Apply some smoothing to remove noise
 432      */
 433     GaussianConvolution( p_diff, p_smooth, i_pitch, i_lines, i_visible );
 434
 435     /**
 436      * Label the shapes and build the labels dependencies list
 437      */
 438     for( j = 0; j < i_pitch; j++ )
 439     {
 440         p_smooth[j] = 0;
 441         p_smooth[(i_lines-1)*i_pitch+j] = 0;
 442     }
 443     for( i = 1; i < i_lines-1; i++ )
 444     {
 445         p_smooth[i*i_pitch] = 0;
 446         for( j = 1; j < i_pitch-1; j++ )
 447         {
 448             if( p_smooth[i*i_pitch+j] > 15 )
 449             {
 450                 if( p_smooth[(i-1)*i_pitch+j-1] )
 451                 {
 452                     p_smooth[i*i_pitch+j] = p_smooth[(i-1)*i_pitch+j-1];
 453                 }
 454                 else if( p_smooth[(i-1)*i_pitch+j] )
 455                     p_smooth[i*i_pitch+j] = p_smooth[(i-1)*i_pitch+j];
 456                 else if( p_smooth[i*i_pitch+j-1] )
 457                     p_smooth[i*i_pitch+j] = p_smooth[i*i_pitch+j-1];
 458                 else
 459                 {
 460                     if( last < NUM_COLORS )
 461                     {
 462                         p_smooth[i*i_pitch+j] = last;
 463                         colors[last] = last;
 464                         last++;
 465                     }
 466                 }
 467                 #define CHECK( A ) \
 468                 if( p_smooth[A] && p_smooth[A] != p_smooth[i*i_pitch+j] ) \
 469                 { \
 470                     if( p_smooth[A] < p_smooth[i*i_pitch+j] ) \
 471                         colors[p_smooth[i*i_pitch+j]] = p_smooth[A]; \
 472                     else \
 473                         colors[p_smooth[A]] = p_smooth[i*i_pitch+j]; \
 474                 }
 475                 CHECK( i*i_pitch+j-1 );
 476                 CHECK( (i-1)*i_pitch+j-1 );
 477                 CHECK( (i-1)*i_pitch+j );
 478                 CHECK( (i-1)*i_pitch+j+1 );
 479                 #undef CHECK
 480             }
 481             else
 482             {
 483                 p_smooth[i*i_pitch+j] = 0;
 484             }
 485         }
 486         p_smooth[i*i_pitch+j] = 0;
 487     }
 488
 489     /**
 490      * Initialise empty rectangle list
 491      */
 492     for( i = 1; i < last; i++ )
 493     {
 494         color_x_min[i] = -1;
 495         color_x_max[i] = -1;
 496         color_y_min[i] = -1;
 497         color_y_max[i] = -1;
 498     }
 499
 500     /**
 501      * Compute rectangle coordinates
 502      */
 503     for( i = 0; i < i_pitch * i_lines; i++ )
 504     {
 505         if( p_smooth[i] )
 506         {
 507             while( colors[p_smooth[i]] != (int)p_smooth[i] )
 508                 p_smooth[i] = colors[p_smooth[i]];
 509             if( color_x_min[p_smooth[i]] == -1 )
 510             {
 511                 color_x_min[p_smooth[i]] =
 512                 color_x_max[p_smooth[i]] = i % i_pitch;
 513                 color_y_min[p_smooth[i]] =
 514                 color_y_max[p_smooth[i]] = i / i_pitch;
 515             }
 516             else
 517             {
 518                 int x = i % i_pitch, y = i / i_pitch;
 519                 if( x < color_x_min[p_smooth[i]] )
 520                     color_x_min[p_smooth[i]] = x;
 521                 if( x > color_x_max[p_smooth[i]] )
 522                     color_x_max[p_smooth[i]] = x;
 523                 if( y < color_y_min[p_smooth[i]] )
 524                     color_y_min[p_smooth[i]] = y;
 525                 if( y > color_y_max[p_smooth[i]] )
 526                     color_y_max[p_smooth[i]] = y;
 527             }
 528         }
 529     }
 530
 531     /**
 532      * Merge overlaping rectangles
 533      */
 534     for( i = 1; i < last; i++ )
 535     {
 536         if( colors[i] != i ) continue;
 537         if( color_x_min[i] == -1 ) continue;
 538         for( j = i+1; j < last; j++ )
 539         {
 540             if( colors[j] != j ) continue;
 541             if( color_x_min[j] == -1 ) continue;
 542             if( __MAX( color_x_min[i], color_x_min[j] ) < __MIN( color_x_max[i], color_x_max[j] ) &&
 543                 __MAX( color_y_min[i], color_y_min[j] ) < __MIN( color_y_max[i], color_y_max[j] ) )
 544             {
 545                 color_x_min[i] = __MIN( color_x_min[i], color_x_min[j] );
 546                 color_x_max[i] = __MAX( color_x_max[i], color_x_max[j] );
 547                 color_y_min[i] = __MIN( color_y_min[i], color_y_min[j] );
 548                 color_y_max[i] = __MAX( color_y_max[i], color_y_max[j] );
 549                 color_x_min[j] = -1;
 550                 j = 0;
 551             }
 552         }
 553     }
 554
 555     return last;
 556 }
 557
 558 static void Draw( filter_t *p_filter, uint8_t *p_pix, int i_pix_pitch, int i_pix_size )
 559 {
 560     filter_sys_t *p_sys = p_filter->p_sys;
 561     int i, j;
 562
 563     for( i = 1, j = 0; i < p_sys->i_colors; i++ )
 564     {
 565         int x, y;
 566
 567         if( p_sys->colors[i] != i )
 568             continue;
 569
 570         const int color_x_min = p_sys->color_x_min[i];
 571         const int color_x_max = p_sys->color_x_max[i];
 572         const int color_y_min = p_sys->color_y_min[i];
 573         const int color_y_max = p_sys->color_y_max[i];
 574
 575         if( color_x_min == -1 )
 576             continue;
 577         if( ( color_y_max - color_y_min ) * ( color_x_max - color_x_min ) < 16 )
 578             continue;
 579
 580         j++;
 581
 582         y = color_y_min;
 583         for( x = color_x_min; x <= color_x_max; x++ )
 584             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 585
 586         y = color_y_max;
 587         for( x = color_x_min; x <= color_x_max; x++ )
 588             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 589
 590         x = color_x_min;
 591         for( y = color_y_min; y <= color_y_max; y++ )
 592             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 593
 594         x = color_x_max;
 595         for( y = color_y_min; y <= color_y_max; y++ )
 596             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 597     }
 598     msg_Dbg( p_filter, "Counted %d moving shapes.", j );
 599 }