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 #include <string.h>
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_sout.h>
  31 #include <vlc_vout.h>
  32
  33 #include "vlc_filter.h"
  34
  35 /*****************************************************************************
  36  * Local prototypes
  37  *****************************************************************************/
  38 static int  Create    ( vlc_object_t * );
  39 static void Destroy   ( vlc_object_t * );
  40
  41 static picture_t *Filter( filter_t *, picture_t * );
  42 static void GaussianConvolution( uint32_t *, uint32_t *, int, int, int );
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47
  48 #define FILTER_PREFIX "motiondetect-"
  49
  50 vlc_module_begin();
  51     set_description( _("Motion detect video filter") );
  52     set_shortname( _( "Motion Detect" ));
  53     set_capability( "video filter2", 0 );
  54     set_category( CAT_VIDEO );
  55     set_subcategory( SUBCAT_VIDEO_VFILTER );
  56
  57     add_shortcut( "motion" );
  58     set_callbacks( Create, Destroy );
  59 vlc_module_end();
  60
  61 #if 0
  62 static const char *ppsz_filter_options[] = {
  63     NULL
  64 };
  65 #endif
  66
  67 struct filter_sys_t
  68 {
  69     uint8_t *p_oldpix;
  70     uint8_t *p_oldpix_u;
  71     uint8_t *p_oldpix_v;
  72     uint32_t *p_buf;
  73     uint32_t *p_buf2;
  74     vlc_mutex_t lock;
  75 };
  76
  77 /*****************************************************************************
  78  * Create
  79  *****************************************************************************/
  80 static int Create( vlc_object_t *p_this )
  81 {
  82     filter_t *p_filter = (filter_t *)p_this;
  83
  84     /* Allocate structure */
  85     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  86     if( p_filter->p_sys == NULL )
  87     {
  88         msg_Err( p_filter, "out of memory" );
  89         return VLC_ENOMEM;
  90     }
  91
  92     p_filter->pf_video_filter = Filter;
  93
  94     p_filter->p_sys->p_oldpix = NULL;
  95     p_filter->p_sys->p_buf = NULL;
  96
  97 #if 0
  98     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
  99                    p_filter->p_cfg );
 100 #endif
 101     vlc_mutex_init( p_filter, &p_filter->p_sys->lock );
 102
 103     return VLC_SUCCESS;
 104 }
 105
 106 /*****************************************************************************
 107  * Destroy
 108  *****************************************************************************/
 109 static void Destroy( vlc_object_t *p_this )
 110 {
 111     filter_t *p_filter = (filter_t *)p_this;
 112
 113     free( p_filter->p_sys->p_oldpix );
 114     free( p_filter->p_sys->p_buf );
 115
 116     vlc_mutex_destroy( &p_filter->p_sys->lock );
 117
 118     free( p_filter->p_sys );
 119 }
 120
 121 /*****************************************************************************
 122  * Render
 123  *****************************************************************************/
 124 static picture_t *Filter( filter_t *p_filter, picture_t *p_inpic )
 125 {
 126     picture_t *p_outpic;
 127     filter_sys_t *p_sys = p_filter->p_sys;
 128
 129     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 130     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 131     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 132     const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
 133
 134     const uint8_t *p_inpix_u = p_inpic->p[U_PLANE].p_pixels;
 135     const uint8_t *p_inpix_v = p_inpic->p[V_PLANE].p_pixels;
 136     const int i_src_pitch_u = p_inpic->p[U_PLANE].i_pitch;
 137     const int i_num_lines_u = p_inpic->p[U_PLANE].i_visible_lines;
 138
 139     uint8_t *p_oldpix;
 140     uint8_t *p_oldpix_u;
 141     uint8_t *p_oldpix_v;
 142     uint8_t *p_outpix;
 143     uint32_t *p_buf;
 144     uint32_t *p_buf2;
 145
 146     int i,j;
 147     int last;
 148
 149     if( !p_inpic ) return NULL;
 150
 151     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 152     if( !p_outpic )
 153     {
 154         msg_Warn( p_filter, "can't get output picture" );
 155         if( p_inpic->pf_release )
 156             p_inpic->pf_release( p_inpic );
 157         return NULL;
 158     }
 159
 160     p_outpix = p_outpic->p[Y_PLANE].p_pixels;
 161     p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
 162                                    p_inpic->p[U_PLANE].p_pixels,
 163         p_inpic->p[U_PLANE].i_pitch * p_inpic->p[U_PLANE].i_visible_lines );
 164     p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
 165                                    p_inpic->p[V_PLANE].p_pixels,
 166         p_inpic->p[V_PLANE].i_pitch * p_inpic->p[V_PLANE].i_visible_lines );
 167
 168     if( !p_sys->p_oldpix || !p_sys->p_buf )
 169     {
 170         free( p_sys->p_oldpix );
 171         free( p_sys->p_buf );
 172         p_sys->p_oldpix = malloc( i_src_pitch * i_num_lines );
 173         p_sys->p_oldpix_u = malloc( i_src_pitch_u * i_num_lines_u );
 174         p_sys->p_oldpix_v = malloc( i_src_pitch_u * i_num_lines_u );
 175         p_sys->p_buf = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines );
 176         p_sys->p_buf2 = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines);
 177         return p_inpic;
 178     }
 179     p_oldpix = p_sys->p_oldpix;
 180     p_oldpix_u = p_sys->p_oldpix_u;
 181     p_oldpix_v = p_sys->p_oldpix_v;
 182     p_buf = p_sys->p_buf;
 183     p_buf2 = p_sys->p_buf2;
 184
 185     vlc_mutex_lock( &p_filter->p_sys->lock );
 186
 187     /**
 188      * Substract Y planes
 189      */
 190     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 191     {
 192         if( p_inpix[i] > p_oldpix[i] )
 193         {
 194             p_buf2[i] = p_inpix[i] - p_oldpix[i];
 195         }
 196         else
 197         {
 198             p_buf2[i] = p_oldpix[i] - p_inpix[i];
 199         }
 200     }
 201     int line;
 202     int col;
 203     int format;
 204     switch( p_inpic->format.i_chroma )
 205     {
 206         case VLC_FOURCC('I','4','2','0'):
 207         case VLC_FOURCC('I','Y','U','V'):
 208         case VLC_FOURCC('J','4','2','0'):
 209         case VLC_FOURCC('Y','V','1','2'):
 210             format = 1;
 211             break;
 212
 213         case VLC_FOURCC('I','4','2','2'):
 214         case VLC_FOURCC('J','4','2','2'):
 215             format = 2;
 216             break;
 217
 218         default:
 219             format = 0;
 220             msg_Warn( p_filter, "Not taking chroma into account" );
 221             break;
 222     }
 223
 224     //format = 0;
 225     if( format )
 226     {
 227         for( line = 0; line < i_num_lines_u; line++ )
 228         {
 229             for( col = 0; col < i_src_pitch_u; col ++ )
 230             {
 231                 int diff;
 232                 i = line * i_src_pitch_u + col;
 233                 if( p_inpix_u[i] > p_oldpix_u[i] )
 234                 {
 235                     diff = p_inpix_u[i] - p_oldpix_u[i];
 236                 }
 237                 else
 238                 {
 239                     diff = p_oldpix_u[i] - p_inpix_u[i];
 240                 }
 241                 if( p_inpix_v[i] > p_oldpix_v[i] )
 242                 {
 243                     diff += p_inpix_v[i] - p_oldpix_v[i];
 244                 }
 245                 else
 246                 {
 247                     diff += p_oldpix_v[i] - p_inpix_v[i];
 248                 }
 249                 switch( format )
 250                 {
 251                     case 1:
 252                         p_buf2[2*line*i_src_pitch+2*col] += diff;
 253                         p_buf2[2*line*i_src_pitch+2*col+1] += diff;
 254                         p_buf2[(2*line+1)*i_src_pitch+2*col] += diff;
 255                         p_buf2[(2*line+1)*i_src_pitch+2*col+1] += diff;
 256                         break;
 257
 258                     case 2:
 259                         p_buf2[line*i_src_pitch+2*col] += diff;
 260                         p_buf2[line*i_src_pitch+2*col+1] += diff;
 261                         break;
 262                 }
 263             }
 264         }
 265     }
 266
 267     /**
 268      * Apply some smoothing to remove noise
 269      */
 270     GaussianConvolution( p_buf2, p_buf, i_src_pitch, i_num_lines, i_src_visible );
 271
 272     /**
 273      * Copy luminance plane
 274      */
 275     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 276     {
 277         p_outpix[i] = p_inpix[i];
 278     }
 279
 280     /**
 281      * Label the shapes ans build the labels dependencies list
 282      */
 283     last = 1;
 284     int colors[5000];
 285     int color_x_min[5000];
 286     int color_x_max[5000];
 287     int color_y_min[5000];
 288     int color_y_max[5000];
 289
 290     for( j = 0; j < i_src_pitch; j++ )
 291     {
 292         p_buf[j] = 0;
 293         p_buf[(i_num_lines-1)*i_src_pitch+j] = 0;
 294     }
 295     for( i = 1; i < i_num_lines-1; i++ )
 296     {
 297         p_buf[i*i_src_pitch] = 0;
 298         for( j = 1; j < i_src_pitch-1; j++ )
 299         {
 300             if( p_buf[i*i_src_pitch+j] > 15 )
 301             {
 302                 if( p_buf[(i-1)*i_src_pitch+j-1] )
 303                 {
 304                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j-1];
 305                 }
 306                 else if( p_buf[(i-1)*i_src_pitch+j] )
 307                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j];
 308                 else if( p_buf[i*i_src_pitch+j-1] )
 309                     p_buf[i*i_src_pitch+j] = p_buf[i*i_src_pitch+j-1];
 310                 else
 311                 {
 312                     p_buf[i*i_src_pitch+j] = last;
 313                     colors[last] = last;
 314                     last++;
 315                 }
 316                 #define CHECK( A ) \
 317                 if( p_buf[A] && p_buf[A] != p_buf[i*i_src_pitch+j] ) \
 318                 { \
 319                     if( p_buf[A] < p_buf[i*i_src_pitch+j] ) \
 320                         colors[p_buf[i*i_src_pitch+j]] = p_buf[A]; \
 321                     else \
 322                         colors[p_buf[A]] = p_buf[i*i_src_pitch+j]; \
 323                 }
 324                 CHECK( i*i_src_pitch+j-1 );
 325                 CHECK( (i-1)*i_src_pitch+j-1 );
 326                 CHECK( (i-1)*i_src_pitch+j );
 327                 CHECK( (i-1)*i_src_pitch+j+1 );
 328             }
 329             else
 330             {
 331                 p_buf[i*i_src_pitch+j] = 0;
 332             }
 333         }
 334         p_buf[i*i_src_pitch+j] = 0;
 335     }
 336
 337     /**
 338      * Initialise empty rectangle list
 339      */
 340     for( i = 1; i < last; i++ )
 341     {
 342         color_x_min[i] = -1;
 343         color_x_max[i] = -1;
 344         color_y_min[i] = -1;
 345         color_y_max[i] = -1;
 346     }
 347
 348     /**
 349      * Compute rectangle coordinates
 350      */
 351     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 352     {
 353         if( p_buf[i] )
 354         {
 355             while( colors[p_buf[i]] != p_buf[i] )
 356                 p_buf[i] = colors[p_buf[i]];
 357             if( color_x_min[p_buf[i]] == -1 )
 358             {
 359                 color_x_min[p_buf[i]] =
 360                 color_x_max[p_buf[i]] = i % i_src_pitch;
 361                 color_y_min[p_buf[i]] =
 362                 color_y_max[p_buf[i]] = i / i_src_pitch;
 363             }
 364             else
 365             {
 366                 int x = i % i_src_pitch, y = i / i_src_pitch;
 367                 if( x < color_x_min[p_buf[i]] )
 368                     color_x_min[p_buf[i]] = x;
 369                 if( x > color_x_max[p_buf[i]] )
 370                     color_x_max[p_buf[i]] = x;
 371                 if( y < color_y_min[p_buf[i]] )
 372                     color_y_min[p_buf[i]] = y;
 373                 if( y > color_y_max[p_buf[i]] )
 374                     color_y_max[p_buf[i]] = y;
 375             }
 376         }
 377     }
 378
 379     /**
 380      * Merge overlaping rectangles
 381      */
 382     for( i = 1; i < last; i++ )
 383     {
 384         if( colors[i] != i ) continue;
 385         if( color_x_min[i] == -1 ) continue;
 386         for( j = i+1; j < last; j++ )
 387         {
 388             if( colors[j] != j ) continue;
 389             if( color_x_min[j] == -1 ) continue;
 390 #define max( a, b ) ( a > b ? a : b )
 391 #define min( a, b ) ( a < b ? a : b )
 392             if( max( color_x_min[i], color_x_min[j] ) < min( color_x_max[i], color_x_max[j] ) && 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     p_filter->p_libvlc->pf_memcpy( p_oldpix, p_inpix,
 444                                    i_src_pitch * i_num_lines );
 445     p_filter->p_libvlc->pf_memcpy( p_oldpix_u, p_inpix_u,
 446                                    i_src_pitch_u * i_num_lines_u );
 447     p_filter->p_libvlc->pf_memcpy( p_oldpix_v, p_inpix_v,
 448                                    i_src_pitch_u * i_num_lines_u );
 449
 450     vlc_mutex_unlock( &p_filter->p_sys->lock );
 451
 452     /* misc stuff */
 453     p_outpic->date = p_inpic->date;
 454     p_outpic->b_force = p_inpic->b_force;
 455     p_outpic->i_nb_fields = p_inpic->i_nb_fields;
 456     p_outpic->b_progressive = p_inpic->b_progressive;
 457     p_outpic->b_top_field_first = p_inpic->b_top_field_first;
 458
 459     if( p_inpic->pf_release )
 460         p_inpic->pf_release( p_inpic );
 461
 462     return p_outpic;
 463 }
 464
 465
 466 /*****************************************************************************
 467  * Gaussian Convolution
 468  *****************************************************************************
 469  *    Gaussian convolution ( sigma == 1.4 )
 470  *
 471  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 472  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 473  *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 474  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 475  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 476  *****************************************************************************/
 477 static void GaussianConvolution( uint32_t *p_inpix, uint32_t *p_smooth,
 478                                  int i_src_pitch, int i_num_lines,
 479                                  int i_src_visible )
 480 {
 481 /*    const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 482     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 483     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 484     const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;*/
 485
 486     int x,y;
 487     for( y = 2; y < i_num_lines - 2; y++ )
 488     {
 489         for( x = 2; x < i_src_visible - 2; x++ )
 490         {
 491             p_smooth[y*i_src_visible+x] = (uint32_t)(
 492               /* 2 rows up */
 493                 ( p_inpix[(y-2)*i_src_pitch+x-2] )
 494               + ((p_inpix[(y-2)*i_src_pitch+x-1]
 495               +   p_inpix[(y-2)*i_src_pitch+x]
 496               +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 497               + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 498               /* 1 row up */
 499               + ((p_inpix[(y-1)*i_src_pitch+x-2]
 500               + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 501               + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 502               + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 503               +   p_inpix[(y-1)*i_src_pitch+x+2]
 504               /* */
 505               +   p_inpix[y*i_src_pitch+x-2]
 506               + ( p_inpix[y*i_src_pitch+x-1]*3 )
 507               + ( p_inpix[y*i_src_pitch+x]<<2 )
 508               + ( p_inpix[y*i_src_pitch+x+1]*3 )
 509               +   p_inpix[y*i_src_pitch+x+2]
 510               /* 1 row down */
 511               +   p_inpix[(y+1)*i_src_pitch+x-2]
 512               + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 513               + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 514               + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 515               +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 516               /* 2 rows down */
 517               + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 518               + ((p_inpix[(y+2)*i_src_pitch+x-1]
 519               +   p_inpix[(y+2)*i_src_pitch+x]
 520               +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 521               + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 522               ) >> 6 /* 115 */;
 523         }
 524     }
 525 }