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
  36 #include <vlc_filter.h>
  37 #include "filter_picture.h"
  38
  39 /*****************************************************************************
  40  * Module descriptor
  41  *****************************************************************************/
  42 static int  Create    ( vlc_object_t * );
  43 static void Destroy   ( vlc_object_t * );
  44
  45 #define FILTER_PREFIX "motiondetect-"
  46
  47 vlc_module_begin ()
  48     set_description( N_("Motion detect video filter") )
  49     set_shortname( N_( "Motion Detect" ))
  50     set_category( CAT_VIDEO )
  51     set_subcategory( SUBCAT_VIDEO_VFILTER )
  52     set_capability( "video filter2", 0 )
  53
  54     add_shortcut( "motion" )
  55     set_callbacks( Create, Destroy )
  56 vlc_module_end ()
  57
  58
  59 /*****************************************************************************
  60  * Local prototypes
  61  *****************************************************************************/
  62 static picture_t *Filter( filter_t *, picture_t * );
  63 static picture_t *FilterPacked( filter_t *, picture_t * );
  64 static void GaussianConvolution( uint32_t *, uint32_t *, int, int, int );
  65 static int FindShapes( uint32_t *, uint32_t *, int, int, int,
  66                        int *, int *, int *, int *, int *);
  67 static void Draw( filter_t *p_filter, uint8_t *p_pix, int i_pix_pitch, int i_pix_size );
  68 #define NUM_COLORS (5000)
  69
  70 struct filter_sys_t
  71 {
  72     bool b_old;
  73     picture_t *p_old;
  74     uint32_t *p_buf;
  75     uint32_t *p_buf2;
  76
  77     /* */
  78     int i_colors;
  79     int colors[NUM_COLORS];
  80     int color_x_min[NUM_COLORS];
  81     int color_x_max[NUM_COLORS];
  82     int color_y_min[NUM_COLORS];
  83     int color_y_max[NUM_COLORS];
  84 };
  85
  86 /*****************************************************************************
  87  * Create
  88  *****************************************************************************/
  89 static int Create( vlc_object_t *p_this )
  90 {
  91     filter_t *p_filter = (filter_t *)p_this;
  92     const video_format_t *p_fmt = &p_filter->fmt_in.video;
  93     filter_sys_t *p_sys;
  94
  95     switch( p_fmt->i_chroma )
  96     {
  97         CASE_PLANAR_YUV
  98             p_filter->pf_video_filter = Filter;
  99             break;
 100
 101         CASE_PACKED_YUV_422
 102             p_filter->pf_video_filter = FilterPacked;
 103             break;
 104
 105         default:
 106             msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
 107                      (char*)&(p_fmt->i_chroma) );
 108             return VLC_EGENERIC;
 109     }
 110
 111     /* Allocate structure */
 112     p_filter->p_sys = p_sys = malloc( sizeof( filter_sys_t ) );
 113     if( p_filter->p_sys == NULL )
 114         return VLC_ENOMEM;
 115
 116     p_sys->b_old = false;
 117     p_sys->p_old = picture_NewFromFormat( p_fmt );
 118     p_sys->p_buf  = calloc( p_fmt->i_width * p_fmt->i_height, sizeof(*p_sys->p_buf) );
 119     p_sys->p_buf2 = calloc( p_fmt->i_width * p_fmt->i_height, sizeof(*p_sys->p_buf) );
 120
 121     if( !p_sys->p_old || !p_sys->p_buf || !p_sys->p_buf2 )
 122     {
 123         free( p_sys->p_buf2 );
 124         free( p_sys->p_buf );
 125         if( p_sys->p_old )
 126             picture_Release( p_sys->p_old );
 127         return VLC_ENOMEM;
 128     }
 129
 130     return VLC_SUCCESS;
 131 }
 132
 133 /*****************************************************************************
 134  * Destroy
 135  *****************************************************************************/
 136 static void Destroy( vlc_object_t *p_this )
 137 {
 138     filter_t *p_filter = (filter_t *)p_this;
 139     filter_sys_t *p_sys = p_filter->p_sys;
 140
 141     free( p_sys->p_buf2 );
 142     free( p_sys->p_buf );
 143     picture_Release( p_sys->p_old );
 144     free( p_sys );
 145 }
 146
 147
 148 /*****************************************************************************
 149  * Filter YUV Planar
 150  *****************************************************************************/
 151 static picture_t *Filter( filter_t *p_filter, picture_t *p_inpic )
 152 {
 153     filter_sys_t *p_sys = p_filter->p_sys;
 154     const video_format_t *p_fmt = &p_filter->fmt_in.video;
 155
 156     picture_t *p_outpic;
 157
 158     uint8_t *p_oldpix   = p_sys->p_old->p[Y_PLANE].p_pixels;
 159     const int i_old_pitch = p_sys->p_old->p[Y_PLANE].i_pitch;
 160     uint32_t *p_buf = p_sys->p_buf;
 161     uint32_t *p_buf2= p_sys->p_buf2;
 162
 163     unsigned x, y;
 164
 165     if( !p_inpic )
 166         return NULL;
 167
 168     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 169     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 170
 171     if( !p_sys->b_old )
 172     {
 173         picture_Copy( p_sys->p_old, p_inpic );
 174         p_sys->b_old = true;
 175         return p_inpic;
 176     }
 177
 178     p_outpic = filter_NewPicture( p_filter );
 179     if( !p_outpic )
 180     {
 181         picture_Release( p_inpic );
 182         return NULL;
 183     }
 184     picture_Copy( p_outpic, p_inpic );
 185
 186     /**
 187      * Substract Y planes
 188      */
 189     for( y = 0; y < p_fmt->i_height; y++ )
 190     {
 191         for( x = 0; x < p_fmt->i_width; x++ )
 192             p_buf2[y*p_fmt->i_width+x] = abs( p_inpix[y*i_src_pitch+x] - p_oldpix[y*i_old_pitch+x] );
 193     }
 194
 195     int i_chroma_dx;
 196     int i_chroma_dy;
 197     switch( p_inpic->format.i_chroma )
 198     {
 199         case VLC_CODEC_I420:
 200         case VLC_CODEC_J420:
 201         case VLC_CODEC_YV12:
 202             i_chroma_dx = 2;
 203             i_chroma_dy = 2;
 204             break;
 205
 206         case VLC_CODEC_I422:
 207         case VLC_CODEC_J422:
 208             i_chroma_dx = 2;
 209             i_chroma_dy = 1;
 210             break;
 211
 212         default:
 213             msg_Warn( p_filter, "Not taking chroma into account" );
 214             i_chroma_dx = 0;
 215             i_chroma_dy = 0;
 216             break;
 217     }
 218
 219     if( i_chroma_dx != 0 && i_chroma_dy != 0 )
 220     {
 221         const uint8_t *p_inpix_u = p_inpic->p[U_PLANE].p_pixels;
 222         const uint8_t *p_inpix_v = p_inpic->p[V_PLANE].p_pixels;
 223         const int i_src_pitch_u = p_inpic->p[U_PLANE].i_pitch;
 224         const int i_src_pitch_v = p_inpic->p[V_PLANE].i_pitch;
 225
 226         const uint8_t *p_oldpix_u = p_sys->p_old->p[U_PLANE].p_pixels;
 227         const uint8_t *p_oldpix_v = p_sys->p_old->p[V_PLANE].p_pixels;
 228         const int i_old_pitch_u = p_sys->p_old->p[U_PLANE].i_pitch;
 229         const int i_old_pitch_v = p_sys->p_old->p[V_PLANE].i_pitch;
 230
 231         for( y = 0; y < p_fmt->i_height/i_chroma_dy; y++ )
 232         {
 233             for( x = 0; x < p_fmt->i_width/i_chroma_dx; x ++ )
 234             {
 235                 const int d = abs( p_inpix_u[y*i_src_pitch_u+x] - p_oldpix_u[y*i_old_pitch_u+x] ) +
 236                               abs( p_inpix_v[y*i_src_pitch_v+x] - p_oldpix_v[y*i_old_pitch_v+x] );
 237                 int i, j;
 238
 239                 for( j = 0; j < i_chroma_dy; j++ )
 240                 {
 241                     for( i = 0; i < i_chroma_dx; i++ )
 242                         p_buf2[i_chroma_dy*p_fmt->i_width*j + i_chroma_dx*i] = d;
 243                 }
 244             }
 245         }
 246     }
 247
 248     /**
 249      * Get the areas where movement was detected
 250      */
 251     p_sys->i_colors = FindShapes( p_buf2, p_buf, p_fmt->i_width, p_fmt->i_width, p_fmt->i_height,
 252                                   p_sys->colors, p_sys->color_x_min, p_sys->color_x_max, p_sys->color_y_min, p_sys->color_y_max );
 253
 254     /**
 255      * Count final number of shapes
 256      * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
 257      */
 258     Draw( p_filter, p_outpic->p[Y_PLANE].p_pixels, p_outpic->p[Y_PLANE].i_pitch, 1 );
 259
 260     /**
 261      * We're done. Lets keep a copy of the picture
 262      * TODO we may just picture_Release with a latency of 1 if the filters/vout
 263      * handle it correctly */
 264     picture_Copy( p_sys->p_old, p_inpic );
 265
 266     picture_Release( p_inpic );
 267     return p_outpic;
 268 }
 269
 270 /*****************************************************************************
 271  * Filter YUV Packed
 272  *****************************************************************************/
 273 static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_inpic )
 274 {
 275     filter_sys_t *p_sys = p_filter->p_sys;
 276     const video_format_t *p_fmt = &p_filter->fmt_in.video;
 277     picture_t *p_outpic;
 278
 279     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 280     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 281
 282     uint8_t *p_oldpix   = p_sys->p_old->p[Y_PLANE].p_pixels;
 283     const int i_old_pitch = p_sys->p_old->p[Y_PLANE].i_pitch;
 284     uint32_t *p_buf = p_sys->p_buf;
 285     uint32_t *p_buf2= p_sys->p_buf2;
 286
 287     int i_y_offset, i_u_offset, i_v_offset;
 288
 289     unsigned x, y;
 290
 291     if( GetPackedYuvOffsets( p_fmt->i_chroma,
 292                              &i_y_offset, &i_u_offset, &i_v_offset ) )
 293     {
 294         msg_Warn( p_filter, "Unsupported input chroma (%4.4s)",
 295                   (char*)&p_fmt->i_chroma );
 296         return p_inpic;
 297     }
 298
 299     if( !p_sys->b_old )
 300     {
 301         picture_Copy( p_sys->p_old, p_inpic );
 302         p_sys->b_old = true;
 303         return p_inpic;
 304     }
 305
 306     p_outpic = filter_NewPicture( p_filter );
 307     if( !p_outpic )
 308     {
 309         picture_Release( p_inpic );
 310         return NULL;
 311     }
 312     picture_Copy( p_outpic, p_inpic );
 313
 314     /* Substract all planes at once */
 315
 316     for( y = 0; y < p_fmt->i_height; y++ )
 317     {
 318         for( x = 0; x < p_fmt->i_width; x+=2 )
 319         {
 320             int i;
 321             int d;
 322
 323             d = abs( p_inpix[y*i_src_pitch+2*x+i_u_offset] - p_oldpix[y*i_old_pitch+2*x+i_u_offset] ) +
 324                 abs( p_inpix[y*i_src_pitch+2*x+i_v_offset] - p_oldpix[y*i_old_pitch+2*x+i_v_offset] );
 325
 326             for( i = 0; i < 2; i++ )
 327                 p_buf2[y*p_fmt->i_width+x+i] =
 328                     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;
 329         }
 330     }
 331
 332     /**
 333      * Get the areas where movement was detected
 334      */
 335     p_sys->i_colors = FindShapes( p_buf2, p_buf, p_fmt->i_width, p_fmt->i_width, p_fmt->i_height,
 336                                   p_sys->colors, p_sys->color_x_min, p_sys->color_x_max, p_sys->color_y_min, p_sys->color_y_max );
 337
 338     /**
 339      * Count final number of shapes
 340      * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
 341      */
 342     Draw( p_filter, &p_outpic->p[Y_PLANE].p_pixels[i_y_offset], p_outpic->p[Y_PLANE].i_pitch, 2 );
 343
 344     /**
 345      * We're done. Lets keep a copy of the picture
 346      * TODO we may just picture_Release with a latency of 1 if the filters/vout
 347      * handle it correctly */
 348     picture_Copy( p_sys->p_old, p_inpic );
 349
 350     picture_Release( p_inpic );
 351     return p_outpic;
 352 }
 353
 354
 355
 356 /*****************************************************************************
 357  * Gaussian Convolution
 358  *****************************************************************************
 359  *    Gaussian convolution ( sigma == 1.4 )
 360  *
 361  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 362  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 363  *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 364  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 365  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 366  *****************************************************************************/
 367 static void GaussianConvolution( uint32_t *p_inpix, uint32_t *p_smooth,
 368                                  int i_src_pitch, int i_num_lines,
 369                                  int i_src_visible )
 370 {
 371     int x,y;
 372
 373     /* A bit overkill but ... simpler */
 374     memset( p_smooth, 0, sizeof(*p_smooth) * i_src_pitch * i_num_lines );
 375
 376     for( y = 2; y < i_num_lines - 2; y++ )
 377     {
 378         for( x = 2; x < i_src_visible - 2; x++ )
 379         {
 380             p_smooth[y*i_src_visible+x] = (uint32_t)(
 381               /* 2 rows up */
 382                 ( p_inpix[(y-2)*i_src_pitch+x-2] )
 383               + ((p_inpix[(y-2)*i_src_pitch+x-1]
 384               +   p_inpix[(y-2)*i_src_pitch+x]
 385               +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 386               + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 387               /* 1 row up */
 388               + ((p_inpix[(y-1)*i_src_pitch+x-2]
 389               + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 390               + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 391               + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 392               +   p_inpix[(y-1)*i_src_pitch+x+2]
 393               /* */
 394               +   p_inpix[y*i_src_pitch+x-2]
 395               + ( p_inpix[y*i_src_pitch+x-1]*3 )
 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               /* 1 row down */
 400               +   p_inpix[(y+1)*i_src_pitch+x-2]
 401               + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 402               + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 403               + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 404               +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 405               /* 2 rows down */
 406               + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 407               + ((p_inpix[(y+2)*i_src_pitch+x-1]
 408               +   p_inpix[(y+2)*i_src_pitch+x]
 409               +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 410               + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 411               ) >> 6 /* 115 */;
 412         }
 413     }
 414 }
 415
 416 /*****************************************************************************
 417  *
 418  *****************************************************************************/
 419 static int FindShapes( uint32_t *p_diff, uint32_t *p_smooth,
 420                        int i_pitch, int i_visible, int i_lines,
 421                        int *colors,
 422                        int *color_x_min, int *color_x_max,
 423                        int *color_y_min, int *color_y_max )
 424 {
 425     int last = 1;
 426     int i, j;
 427
 428     /**
 429      * Apply some smoothing to remove noise
 430      */
 431     GaussianConvolution( p_diff, p_smooth, i_pitch, i_lines, i_visible );
 432
 433     /**
 434      * Label the shapes and build the labels dependencies list
 435      */
 436     for( j = 0; j < i_pitch; j++ )
 437     {
 438         p_smooth[j] = 0;
 439         p_smooth[(i_lines-1)*i_pitch+j] = 0;
 440     }
 441     for( i = 1; i < i_lines-1; i++ )
 442     {
 443         p_smooth[i*i_pitch] = 0;
 444         for( j = 1; j < i_pitch-1; j++ )
 445         {
 446             if( p_smooth[i*i_pitch+j] > 15 )
 447             {
 448                 if( p_smooth[(i-1)*i_pitch+j-1] )
 449                 {
 450                     p_smooth[i*i_pitch+j] = p_smooth[(i-1)*i_pitch+j-1];
 451                 }
 452                 else if( p_smooth[(i-1)*i_pitch+j] )
 453                     p_smooth[i*i_pitch+j] = p_smooth[(i-1)*i_pitch+j];
 454                 else if( p_smooth[i*i_pitch+j-1] )
 455                     p_smooth[i*i_pitch+j] = p_smooth[i*i_pitch+j-1];
 456                 else
 457                 {
 458                     if( last < NUM_COLORS )
 459                     {
 460                         p_smooth[i*i_pitch+j] = last;
 461                         colors[last] = last;
 462                         last++;
 463                     }
 464                 }
 465                 #define CHECK( A ) \
 466                 if( p_smooth[A] && p_smooth[A] != p_smooth[i*i_pitch+j] ) \
 467                 { \
 468                     if( p_smooth[A] < p_smooth[i*i_pitch+j] ) \
 469                         colors[p_smooth[i*i_pitch+j]] = p_smooth[A]; \
 470                     else \
 471                         colors[p_smooth[A]] = p_smooth[i*i_pitch+j]; \
 472                 }
 473                 CHECK( i*i_pitch+j-1 );
 474                 CHECK( (i-1)*i_pitch+j-1 );
 475                 CHECK( (i-1)*i_pitch+j );
 476                 CHECK( (i-1)*i_pitch+j+1 );
 477                 #undef CHECK
 478             }
 479             else
 480             {
 481                 p_smooth[i*i_pitch+j] = 0;
 482             }
 483         }
 484         p_smooth[i*i_pitch+j] = 0;
 485     }
 486
 487     /**
 488      * Initialise empty rectangle list
 489      */
 490     for( i = 1; i < last; i++ )
 491     {
 492         color_x_min[i] = -1;
 493         color_x_max[i] = -1;
 494         color_y_min[i] = -1;
 495         color_y_max[i] = -1;
 496     }
 497
 498     /**
 499      * Compute rectangle coordinates
 500      */
 501     for( i = 0; i < i_pitch * i_lines; i++ )
 502     {
 503         if( p_smooth[i] )
 504         {
 505             while( colors[p_smooth[i]] != (int)p_smooth[i] )
 506                 p_smooth[i] = colors[p_smooth[i]];
 507             if( color_x_min[p_smooth[i]] == -1 )
 508             {
 509                 color_x_min[p_smooth[i]] =
 510                 color_x_max[p_smooth[i]] = i % i_pitch;
 511                 color_y_min[p_smooth[i]] =
 512                 color_y_max[p_smooth[i]] = i / i_pitch;
 513             }
 514             else
 515             {
 516                 int x = i % i_pitch, y = i / i_pitch;
 517                 if( x < color_x_min[p_smooth[i]] )
 518                     color_x_min[p_smooth[i]] = x;
 519                 if( x > color_x_max[p_smooth[i]] )
 520                     color_x_max[p_smooth[i]] = x;
 521                 if( y < color_y_min[p_smooth[i]] )
 522                     color_y_min[p_smooth[i]] = y;
 523                 if( y > color_y_max[p_smooth[i]] )
 524                     color_y_max[p_smooth[i]] = y;
 525             }
 526         }
 527     }
 528
 529     /**
 530      * Merge overlaping rectangles
 531      */
 532     for( i = 1; i < last; i++ )
 533     {
 534         if( colors[i] != i ) continue;
 535         if( color_x_min[i] == -1 ) continue;
 536         for( j = i+1; j < last; j++ )
 537         {
 538             if( colors[j] != j ) continue;
 539             if( color_x_min[j] == -1 ) continue;
 540             if( __MAX( color_x_min[i], color_x_min[j] ) < __MIN( color_x_max[i], color_x_max[j] ) &&
 541                 __MAX( color_y_min[i], color_y_min[j] ) < __MIN( color_y_max[i], color_y_max[j] ) )
 542             {
 543                 color_x_min[i] = __MIN( color_x_min[i], color_x_min[j] );
 544                 color_x_max[i] = __MAX( color_x_max[i], color_x_max[j] );
 545                 color_y_min[i] = __MIN( color_y_min[i], color_y_min[j] );
 546                 color_y_max[i] = __MAX( color_y_max[i], color_y_max[j] );
 547                 color_x_min[j] = -1;
 548                 j = 0;
 549             }
 550         }
 551     }
 552
 553     return last;
 554 }
 555
 556 static void Draw( filter_t *p_filter, uint8_t *p_pix, int i_pix_pitch, int i_pix_size )
 557 {
 558     filter_sys_t *p_sys = p_filter->p_sys;
 559     int i, j;
 560
 561     for( i = 1, j = 0; i < p_sys->i_colors; i++ )
 562     {
 563         int x, y;
 564
 565         if( p_sys->colors[i] != i )
 566             continue;
 567
 568         const int color_x_min = p_sys->color_x_min[i];
 569         const int color_x_max = p_sys->color_x_max[i];
 570         const int color_y_min = p_sys->color_y_min[i];
 571         const int color_y_max = p_sys->color_y_max[i];
 572
 573         if( color_x_min == -1 )
 574             continue;
 575         if( ( color_y_max - color_y_min ) * ( color_x_max - color_x_min ) < 16 )
 576             continue;
 577
 578         j++;
 579
 580         y = color_y_min;
 581         for( x = color_x_min; x <= color_x_max; x++ )
 582             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 583
 584         y = color_y_max;
 585         for( x = color_x_min; x <= color_x_max; x++ )
 586             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 587
 588         x = color_x_min;
 589         for( y = color_y_min; y <= color_y_max; y++ )
 590             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 591
 592         x = color_x_max;
 593         for( y = color_y_min; y <= color_y_max; y++ )
 594             p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
 595     }
 596     msg_Dbg( p_filter, "Counted %d moving shapes.", j );
 597 }