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) 2000-2006 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/vlc.h>
  33 #include <vlc_sout.h>
  34 #include <vlc_vout.h>
  35
  36 #include "vlc_filter.h"
  37
  38 /*****************************************************************************
  39  * Local prototypes
  40  *****************************************************************************/
  41 static int  Create    ( vlc_object_t * );
  42 static void Destroy   ( vlc_object_t * );
  43
  44 static picture_t *Filter( filter_t *, picture_t * );
  45 static void GaussianConvolution( uint32_t *, uint32_t *, int, int, int );
  46
  47 /*****************************************************************************
  48  * Module descriptor
  49  *****************************************************************************/
  50
  51 #define FILTER_PREFIX "motiondetect-"
  52
  53 vlc_module_begin();
  54     set_description( _("Motion detect video filter") );
  55     set_shortname( _( "Motion Detect" ));
  56     set_capability( "video filter2", 0 );
  57     set_category( CAT_VIDEO );
  58     set_subcategory( SUBCAT_VIDEO_VFILTER );
  59
  60     add_shortcut( "motion" );
  61     set_callbacks( Create, Destroy );
  62 vlc_module_end();
  63
  64 #if 0
  65 static const char *ppsz_filter_options[] = {
  66     NULL
  67 };
  68 #endif
  69
  70 struct filter_sys_t
  71 {
  72     uint8_t *p_oldpix;
  73     uint8_t *p_oldpix_u;
  74     uint8_t *p_oldpix_v;
  75     uint32_t *p_buf;
  76     uint32_t *p_buf2;
  77     vlc_mutex_t lock;
  78 };
  79
  80 /*****************************************************************************
  81  * Create
  82  *****************************************************************************/
  83 static int Create( vlc_object_t *p_this )
  84 {
  85     filter_t *p_filter = (filter_t *)p_this;
  86
  87     /* Allocate structure */
  88     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  89     if( p_filter->p_sys == NULL )
  90     {
  91         msg_Err( p_filter, "out of memory" );
  92         return VLC_ENOMEM;
  93     }
  94
  95     p_filter->pf_video_filter = Filter;
  96
  97     p_filter->p_sys->p_oldpix = NULL;
  98     p_filter->p_sys->p_buf = NULL;
  99
 100 #if 0
 101     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 102                    p_filter->p_cfg );
 103 #endif
 104     vlc_mutex_init( &p_filter->p_sys->lock );
 105
 106     return VLC_SUCCESS;
 107 }
 108
 109 /*****************************************************************************
 110  * Destroy
 111  *****************************************************************************/
 112 static void Destroy( vlc_object_t *p_this )
 113 {
 114     filter_t *p_filter = (filter_t *)p_this;
 115
 116     free( p_filter->p_sys->p_oldpix );
 117     free( p_filter->p_sys->p_buf );
 118
 119     vlc_mutex_destroy( &p_filter->p_sys->lock );
 120
 121     free( p_filter->p_sys );
 122 }
 123
 124 /*****************************************************************************
 125  * Render
 126  *****************************************************************************/
 127 static picture_t *Filter( filter_t *p_filter, picture_t *p_inpic )
 128 {
 129     picture_t *p_outpic;
 130     filter_sys_t *p_sys = p_filter->p_sys;
 131
 132     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 133     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 134     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 135     const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
 136
 137     const uint8_t *p_inpix_u = p_inpic->p[U_PLANE].p_pixels;
 138     const uint8_t *p_inpix_v = p_inpic->p[V_PLANE].p_pixels;
 139     const int i_src_pitch_u = p_inpic->p[U_PLANE].i_pitch;
 140     const int i_num_lines_u = p_inpic->p[U_PLANE].i_visible_lines;
 141
 142     uint8_t *p_oldpix;
 143     uint8_t *p_oldpix_u;
 144     uint8_t *p_oldpix_v;
 145     uint8_t *p_outpix;
 146     uint32_t *p_buf;
 147     uint32_t *p_buf2;
 148
 149     int i,j;
 150     int last;
 151
 152     if( !p_inpic ) return NULL;
 153
 154     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 155     if( !p_outpic )
 156     {
 157         msg_Warn( p_filter, "can't get output picture" );
 158         if( p_inpic->pf_release )
 159             p_inpic->pf_release( p_inpic );
 160         return NULL;
 161     }
 162
 163     p_outpix = p_outpic->p[Y_PLANE].p_pixels;
 164     vlc_memcpy( p_outpic->p[U_PLANE].p_pixels, p_inpic->p[U_PLANE].p_pixels,
 165         p_inpic->p[U_PLANE].i_pitch * p_inpic->p[U_PLANE].i_visible_lines );
 166     vlc_memcpy( p_outpic->p[V_PLANE].p_pixels, p_inpic->p[V_PLANE].p_pixels,
 167         p_inpic->p[V_PLANE].i_pitch * p_inpic->p[V_PLANE].i_visible_lines );
 168
 169     if( !p_sys->p_oldpix || !p_sys->p_buf )
 170     {
 171         free( p_sys->p_oldpix );
 172         free( p_sys->p_buf );
 173         p_sys->p_oldpix = malloc( i_src_pitch * i_num_lines );
 174         p_sys->p_oldpix_u = malloc( i_src_pitch_u * i_num_lines_u );
 175         p_sys->p_oldpix_v = malloc( i_src_pitch_u * i_num_lines_u );
 176         p_sys->p_buf = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines );
 177         p_sys->p_buf2 = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines);
 178         return p_inpic;
 179     }
 180     p_oldpix = p_sys->p_oldpix;
 181     p_oldpix_u = p_sys->p_oldpix_u;
 182     p_oldpix_v = p_sys->p_oldpix_v;
 183     p_buf = p_sys->p_buf;
 184     p_buf2 = p_sys->p_buf2;
 185
 186     vlc_mutex_lock( &p_filter->p_sys->lock );
 187
 188     /**
 189      * Substract Y planes
 190      */
 191     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 192     {
 193         if( p_inpix[i] > p_oldpix[i] )
 194         {
 195             p_buf2[i] = p_inpix[i] - p_oldpix[i];
 196         }
 197         else
 198         {
 199             p_buf2[i] = p_oldpix[i] - p_inpix[i];
 200         }
 201     }
 202     int line;
 203     int col;
 204     int format;
 205     switch( p_inpic->format.i_chroma )
 206     {
 207         case VLC_FOURCC('I','4','2','0'):
 208         case VLC_FOURCC('I','Y','U','V'):
 209         case VLC_FOURCC('J','4','2','0'):
 210         case VLC_FOURCC('Y','V','1','2'):
 211             format = 1;
 212             break;
 213
 214         case VLC_FOURCC('I','4','2','2'):
 215         case VLC_FOURCC('J','4','2','2'):
 216             format = 2;
 217             break;
 218
 219         default:
 220             format = 0;
 221             msg_Warn( p_filter, "Not taking chroma into account" );
 222             break;
 223     }
 224
 225     //format = 0;
 226     if( format )
 227     {
 228         for( line = 0; line < i_num_lines_u; line++ )
 229         {
 230             for( col = 0; col < i_src_pitch_u; col ++ )
 231             {
 232                 int diff;
 233                 i = line * i_src_pitch_u + col;
 234                 if( p_inpix_u[i] > p_oldpix_u[i] )
 235                 {
 236                     diff = p_inpix_u[i] - p_oldpix_u[i];
 237                 }
 238                 else
 239                 {
 240                     diff = p_oldpix_u[i] - p_inpix_u[i];
 241                 }
 242                 if( p_inpix_v[i] > p_oldpix_v[i] )
 243                 {
 244                     diff += p_inpix_v[i] - p_oldpix_v[i];
 245                 }
 246                 else
 247                 {
 248                     diff += p_oldpix_v[i] - p_inpix_v[i];
 249                 }
 250                 switch( format )
 251                 {
 252                     case 1:
 253                         p_buf2[2*line*i_src_pitch+2*col] += diff;
 254                         p_buf2[2*line*i_src_pitch+2*col+1] += diff;
 255                         p_buf2[(2*line+1)*i_src_pitch+2*col] += diff;
 256                         p_buf2[(2*line+1)*i_src_pitch+2*col+1] += diff;
 257                         break;
 258
 259                     case 2:
 260                         p_buf2[line*i_src_pitch+2*col] += diff;
 261                         p_buf2[line*i_src_pitch+2*col+1] += diff;
 262                         break;
 263                 }
 264             }
 265         }
 266     }
 267
 268     /**
 269      * Apply some smoothing to remove noise
 270      */
 271     GaussianConvolution( p_buf2, p_buf, i_src_pitch, i_num_lines, i_src_visible );
 272
 273     /**
 274      * Copy luminance plane
 275      */
 276     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 277     {
 278         p_outpix[i] = p_inpix[i];
 279     }
 280
 281     /**
 282      * Label the shapes ans build the labels dependencies list
 283      */
 284     last = 1;
 285     int colors[5000];
 286     int color_x_min[5000];
 287     int color_x_max[5000];
 288     int color_y_min[5000];
 289     int color_y_max[5000];
 290
 291     for( j = 0; j < i_src_pitch; j++ )
 292     {
 293         p_buf[j] = 0;
 294         p_buf[(i_num_lines-1)*i_src_pitch+j] = 0;
 295     }
 296     for( i = 1; i < i_num_lines-1; i++ )
 297     {
 298         p_buf[i*i_src_pitch] = 0;
 299         for( j = 1; j < i_src_pitch-1; j++ )
 300         {
 301             if( p_buf[i*i_src_pitch+j] > 15 )
 302             {
 303                 if( p_buf[(i-1)*i_src_pitch+j-1] )
 304                 {
 305                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j-1];
 306                 }
 307                 else if( p_buf[(i-1)*i_src_pitch+j] )
 308                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j];
 309                 else if( p_buf[i*i_src_pitch+j-1] )
 310                     p_buf[i*i_src_pitch+j] = p_buf[i*i_src_pitch+j-1];
 311                 else
 312                 {
 313                     p_buf[i*i_src_pitch+j] = last;
 314                     colors[last] = last;
 315                     last++;
 316                 }
 317                 #define CHECK( A ) \
 318                 if( p_buf[A] && p_buf[A] != p_buf[i*i_src_pitch+j] ) \
 319                 { \
 320                     if( p_buf[A] < p_buf[i*i_src_pitch+j] ) \
 321                         colors[p_buf[i*i_src_pitch+j]] = p_buf[A]; \
 322                     else \
 323                         colors[p_buf[A]] = p_buf[i*i_src_pitch+j]; \
 324                 }
 325                 CHECK( i*i_src_pitch+j-1 );
 326                 CHECK( (i-1)*i_src_pitch+j-1 );
 327                 CHECK( (i-1)*i_src_pitch+j );
 328                 CHECK( (i-1)*i_src_pitch+j+1 );
 329             }
 330             else
 331             {
 332                 p_buf[i*i_src_pitch+j] = 0;
 333             }
 334         }
 335         p_buf[i*i_src_pitch+j] = 0;
 336     }
 337
 338     /**
 339      * Initialise empty rectangle list
 340      */
 341     for( i = 1; i < last; i++ )
 342     {
 343         color_x_min[i] = -1;
 344         color_x_max[i] = -1;
 345         color_y_min[i] = -1;
 346         color_y_max[i] = -1;
 347     }
 348
 349     /**
 350      * Compute rectangle coordinates
 351      */
 352     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 353     {
 354         if( p_buf[i] )
 355         {
 356             while( colors[p_buf[i]] != p_buf[i] )
 357                 p_buf[i] = colors[p_buf[i]];
 358             if( color_x_min[p_buf[i]] == -1 )
 359             {
 360                 color_x_min[p_buf[i]] =
 361                 color_x_max[p_buf[i]] = i % i_src_pitch;
 362                 color_y_min[p_buf[i]] =
 363                 color_y_max[p_buf[i]] = i / i_src_pitch;
 364             }
 365             else
 366             {
 367                 int x = i % i_src_pitch, y = i / i_src_pitch;
 368                 if( x < color_x_min[p_buf[i]] )
 369                     color_x_min[p_buf[i]] = x;
 370                 if( x > color_x_max[p_buf[i]] )
 371                     color_x_max[p_buf[i]] = x;
 372                 if( y < color_y_min[p_buf[i]] )
 373                     color_y_min[p_buf[i]] = y;
 374                 if( y > color_y_max[p_buf[i]] )
 375                     color_y_max[p_buf[i]] = y;
 376             }
 377         }
 378     }
 379
 380     /**
 381      * Merge overlaping rectangles
 382      */
 383     for( i = 1; i < last; i++ )
 384     {
 385         if( colors[i] != i ) continue;
 386         if( color_x_min[i] == -1 ) continue;
 387         for( j = i+1; j < last; j++ )
 388         {
 389             if( colors[j] != j ) continue;
 390             if( color_x_min[j] == -1 ) continue;
 391             if( __MAX( color_x_min[i], color_x_min[j] ) < __MIN( color_x_max[i], color_x_max[j] ) &&
 392                 __MAX( color_y_min[i], color_y_min[j] ) < __MIN( color_y_max[i], color_y_max[j] ) )
 393             {
 394                 color_x_min[i] = __MIN( color_x_min[i], color_x_min[j] );
 395                 color_x_max[i] = __MAX( color_x_max[i], color_x_max[j] );
 396                 color_y_min[i] = __MIN( color_y_min[i], color_y_min[j] );
 397                 color_y_max[i] = __MAX( color_y_max[i], color_y_max[j] );
 398                 color_x_min[j] = -1;
 399                 j = 0;
 400             }
 401         }
 402     }
 403
 404     /**
 405      * Count final number of shapes
 406      * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
 407      */
 408     j = 0;
 409     for( i = 1; i < last; i++ )
 410     {
 411         if( colors[i] == i && color_x_min[i] != -1 )
 412         {
 413             if( ( color_y_max[i] - color_y_min[i] ) * ( color_x_max[i] - color_x_min[i] ) < 16 ) continue;
 414             j++;
 415             int x, y;
 416             y = color_y_min[i];
 417             for( x = color_x_min[i]; x <= color_x_max[i]; x++ )
 418             {
 419                 p_outpix[y*i_src_pitch+x] = 0xff;
 420             }
 421             y = color_y_max[i];
 422             for( x = color_x_min[i]; x <= color_x_max[i]; x++ )
 423             {
 424                 p_outpix[y*i_src_pitch+x] = 0xff;
 425             }
 426             x = color_x_min[i];
 427             for( y = color_y_min[i]; y <= color_y_max[i]; y++ )
 428             {
 429                 p_outpix[y*i_src_pitch+x] = 0xff;
 430             }
 431             x = color_x_max[i];
 432             for( y = color_y_min[i]; y <= color_y_max[i]; y++ )
 433             {
 434                 p_outpix[y*i_src_pitch+x] = 0xff;
 435             }
 436         }
 437     }
 438     msg_Dbg( p_filter, "Counted %d moving shapes.", j);
 439
 440     /**
 441      * We're done. Lets keep a copy of the picture
 442      */
 443     vlc_memcpy( p_oldpix, p_inpix, i_src_pitch * i_num_lines );
 444     vlc_memcpy( p_oldpix_u, p_inpix_u, i_src_pitch_u * i_num_lines_u );
 445     vlc_memcpy( p_oldpix_v, p_inpix_v, i_src_pitch_u * i_num_lines_u );
 446
 447     vlc_mutex_unlock( &p_filter->p_sys->lock );
 448
 449     /* misc stuff */
 450     p_outpic->date = p_inpic->date;
 451     p_outpic->b_force = p_inpic->b_force;
 452     p_outpic->i_nb_fields = p_inpic->i_nb_fields;
 453     p_outpic->b_progressive = p_inpic->b_progressive;
 454     p_outpic->b_top_field_first = p_inpic->b_top_field_first;
 455
 456     if( p_inpic->pf_release )
 457         p_inpic->pf_release( p_inpic );
 458
 459     return p_outpic;
 460 }
 461
 462
 463 /*****************************************************************************
 464  * Gaussian Convolution
 465  *****************************************************************************
 466  *    Gaussian convolution ( sigma == 1.4 )
 467  *
 468  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 469  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 470  *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 471  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 472  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 473  *****************************************************************************/
 474 static void GaussianConvolution( uint32_t *p_inpix, uint32_t *p_smooth,
 475                                  int i_src_pitch, int i_num_lines,
 476                                  int i_src_visible )
 477 {
 478 /*    const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 479     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 480     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 481     const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;*/
 482
 483     int x,y;
 484     for( y = 2; y < i_num_lines - 2; y++ )
 485     {
 486         for( x = 2; x < i_src_visible - 2; x++ )
 487         {
 488             p_smooth[y*i_src_visible+x] = (uint32_t)(
 489               /* 2 rows up */
 490                 ( p_inpix[(y-2)*i_src_pitch+x-2] )
 491               + ((p_inpix[(y-2)*i_src_pitch+x-1]
 492               +   p_inpix[(y-2)*i_src_pitch+x]
 493               +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 494               + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 495               /* 1 row up */
 496               + ((p_inpix[(y-1)*i_src_pitch+x-2]
 497               + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 498               + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 499               + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 500               +   p_inpix[(y-1)*i_src_pitch+x+2]
 501               /* */
 502               +   p_inpix[y*i_src_pitch+x-2]
 503               + ( p_inpix[y*i_src_pitch+x-1]*3 )
 504               + ( p_inpix[y*i_src_pitch+x]<<2 )
 505               + ( p_inpix[y*i_src_pitch+x+1]*3 )
 506               +   p_inpix[y*i_src_pitch+x+2]
 507               /* 1 row down */
 508               +   p_inpix[(y+1)*i_src_pitch+x-2]
 509               + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 510               + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 511               + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 512               +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 513               /* 2 rows down */
 514               + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 515               + ((p_inpix[(y+2)*i_src_pitch+x-1]
 516               +   p_inpix[(y+2)*i_src_pitch+x]
 517               +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 518               + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 519               ) >> 6 /* 115 */;
 520         }
 521     }
 522 }