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 <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29
  30 #include <math.h>                                            /* sin(), cos() */
  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_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     p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
 165                                    p_inpic->p[U_PLANE].p_pixels,
 166         p_inpic->p[U_PLANE].i_pitch * p_inpic->p[U_PLANE].i_visible_lines );
 167     p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
 168                                    p_inpic->p[V_PLANE].p_pixels,
 169         p_inpic->p[V_PLANE].i_pitch * p_inpic->p[V_PLANE].i_visible_lines );
 170
 171     if( !p_sys->p_oldpix || !p_sys->p_buf )
 172     {
 173         free( p_sys->p_oldpix );
 174         free( p_sys->p_buf );
 175         p_sys->p_oldpix = malloc( i_src_pitch * i_num_lines );
 176         p_sys->p_oldpix_u = malloc( i_src_pitch_u * i_num_lines_u );
 177         p_sys->p_oldpix_v = malloc( i_src_pitch_u * i_num_lines_u );
 178         p_sys->p_buf = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines );
 179         p_sys->p_buf2 = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines);
 180         return p_inpic;
 181     }
 182     p_oldpix = p_sys->p_oldpix;
 183     p_oldpix_u = p_sys->p_oldpix_u;
 184     p_oldpix_v = p_sys->p_oldpix_v;
 185     p_buf = p_sys->p_buf;
 186     p_buf2 = p_sys->p_buf2;
 187
 188     vlc_mutex_lock( &p_filter->p_sys->lock );
 189
 190     /**
 191      * Substract Y planes
 192      */
 193     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 194     {
 195         if( p_inpix[i] > p_oldpix[i] )
 196         {
 197             p_buf2[i] = p_inpix[i] - p_oldpix[i];
 198         }
 199         else
 200         {
 201             p_buf2[i] = p_oldpix[i] - p_inpix[i];
 202         }
 203     }
 204     int line;
 205     int col;
 206     int format;
 207     switch( p_inpic->format.i_chroma )
 208     {
 209         case VLC_FOURCC('I','4','2','0'):
 210         case VLC_FOURCC('I','Y','U','V'):
 211         case VLC_FOURCC('J','4','2','0'):
 212         case VLC_FOURCC('Y','V','1','2'):
 213             format = 1;
 214             break;
 215
 216         case VLC_FOURCC('I','4','2','2'):
 217         case VLC_FOURCC('J','4','2','2'):
 218             format = 2;
 219             break;
 220
 221         default:
 222             format = 0;
 223             msg_Warn( p_filter, "Not taking chroma into account" );
 224             break;
 225     }
 226     format = 0;
 227     if( format )
 228     {
 229         for( line = 0; line < i_num_lines_u; line++ )
 230         {
 231             for( col = 0; col < i_src_pitch_u; col ++ )
 232             {
 233                 int diff;
 234                 i = line * i_src_pitch_u + col;
 235                 if( p_inpix_u[i] > p_oldpix_u[i] )
 236                 {
 237                     diff = p_inpix_u[i] - p_oldpix_u[i];
 238                 }
 239                 else
 240                 {
 241                     diff = p_oldpix_u[i] - p_inpix_u[i];
 242                 }
 243                 if( p_inpix_v[i] > p_oldpix_v[i] )
 244                 {
 245                     diff += p_inpix_v[i] - p_oldpix_v[i];
 246                 }
 247                 else
 248                 {
 249                     diff += p_oldpix_v[i] - p_inpix_v[i];
 250                 }
 251                 switch( format )
 252                 {
 253                     case 1:
 254                         p_buf2[2*line*i_src_pitch+2*col] += diff;
 255                         p_buf2[2*line*i_src_pitch+2*col+1] += diff;
 256                         p_buf2[(2*line+1)*i_src_pitch+2*col] += diff;
 257                         p_buf2[(2*line+1)*i_src_pitch+2*col+1] += diff;
 258                         break;
 259
 260                     case 2:
 261                         p_buf2[line*i_src_pitch+2*col] += diff;
 262                         p_buf2[line*i_src_pitch+2*col+1] += diff;
 263                         break;
 264                 }
 265             }
 266         }
 267     }
 268
 269     /**
 270      * Apply some smoothing to remove noise
 271      */
 272     GaussianConvolution( p_buf2, p_buf, i_src_pitch, i_num_lines, i_src_visible );
 273
 274     /**
 275      * Copy luminance plane
 276      */
 277     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 278     {
 279         p_outpix[i] = p_inpix[i];
 280     }
 281
 282     /**
 283      * Label the shapes ans build the labels dependencies list
 284      */
 285     last = 1;
 286     int colors[5000];
 287     int color_x_min[5000];
 288     int color_x_max[5000];
 289     int color_y_min[5000];
 290     int color_y_max[5000];
 291
 292     for( j = 0; j < i_src_pitch; j++ )
 293     {
 294         p_buf[j] = 0;
 295         p_buf[(i_num_lines-1)*i_src_pitch+j] = 0;
 296     }
 297     for( i = 1; i < i_num_lines-1; i++ )
 298     {
 299         p_buf[i*i_src_pitch] = 0;
 300         for( j = 1; j < i_src_pitch-1; j++ )
 301         {
 302             if( p_buf[i*i_src_pitch+j] > 15 )
 303             {
 304                 if( p_buf[(i-1)*i_src_pitch+j-1] )
 305                 {
 306                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j-1];
 307                 }
 308                 else if( p_buf[(i-1)*i_src_pitch+j] )
 309                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j];
 310                 else if( p_buf[i*i_src_pitch+j-1] )
 311                     p_buf[i*i_src_pitch+j] = p_buf[i*i_src_pitch+j-1];
 312                 else
 313                 {
 314                     p_buf[i*i_src_pitch+j] = last;
 315                     colors[last] = last;
 316                     last++;
 317                 }
 318                 #define CHECK( A ) \
 319                 if( p_buf[A] && p_buf[A] != p_buf[i*i_src_pitch+j] ) \
 320                 { \
 321                     if( p_buf[A] < p_buf[i*i_src_pitch+j] ) \
 322                         colors[p_buf[i*i_src_pitch+j]] = p_buf[A]; \
 323                     else \
 324                         colors[p_buf[A]] = p_buf[i*i_src_pitch+j]; \
 325                 }
 326                 CHECK( i*i_src_pitch+j-1 );
 327                 CHECK( (i-1)*i_src_pitch+j-1 );
 328                 CHECK( (i-1)*i_src_pitch+j );
 329                 CHECK( (i-1)*i_src_pitch+j+1 );
 330             }
 331             else
 332             {
 333                 p_buf[i*i_src_pitch+j] = 0;
 334             }
 335         }
 336         p_buf[i*i_src_pitch+j] = 0;
 337     }
 338
 339     /**
 340      * Initialise empty rectangle list
 341      */
 342     for( i = 1; i < last; i++ )
 343     {
 344         color_x_min[i] = -1;
 345         color_x_max[i] = -1;
 346         color_y_min[i] = -1;
 347         color_y_max[i] = -1;
 348     }
 349
 350     /**
 351      * Compute rectangle coordinates
 352      */
 353     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 354     {
 355         if( p_buf[i] )
 356         {
 357             while( colors[p_buf[i]] != p_buf[i] )
 358                 p_buf[i] = colors[p_buf[i]];
 359             if( color_x_min[p_buf[i]] == -1 )
 360             {
 361                 color_x_min[p_buf[i]] =
 362                 color_x_max[p_buf[i]] = i % i_src_pitch;
 363                 color_y_min[p_buf[i]] =
 364                 color_y_max[p_buf[i]] = i / i_src_pitch;
 365             }
 366             else
 367             {
 368                 int x = i % i_src_pitch, y = i / i_src_pitch;
 369                 if( x < color_x_min[p_buf[i]] )
 370                     color_x_min[p_buf[i]] = x;
 371                 if( x > color_x_max[p_buf[i]] )
 372                     color_x_max[p_buf[i]] = x;
 373                 if( y < color_y_min[p_buf[i]] )
 374                     color_y_min[p_buf[i]] = y;
 375                 if( y > color_y_max[p_buf[i]] )
 376                     color_y_max[p_buf[i]] = y;
 377             }
 378         }
 379     }
 380
 381     /**
 382      * Merge overlaping rectangles
 383      */
 384     for( i = 1; i < last; i++ )
 385     {
 386         if( colors[i] != i ) continue;
 387         if( color_x_min[i] == -1 ) continue;
 388         for( j = i+1; j < last; j++ )
 389         {
 390             if( colors[j] != j ) continue;
 391             if( color_x_min[j] == -1 ) continue;
 392 #define max( a, b ) ( a > b ? a : b )
 393 #define min( a, b ) ( a < b ? a : b )
 394             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] ) )
 395             {
 396                 color_x_min[i] = min( color_x_min[i], color_x_min[j] );
 397                 color_x_max[i] = max( color_x_max[i], color_x_max[j] );
 398                 color_y_min[i] = min( color_y_min[i], color_y_min[j] );
 399                 color_y_max[i] = max( color_y_max[i], color_y_max[j] );
 400                 color_x_min[j] = -1;
 401                 j = 0;
 402             }
 403         }
 404     }
 405
 406     /**
 407      * Count final number of shapes
 408      * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
 409      */
 410     j = 0;
 411     for( i = 1; i < last; i++ )
 412     {
 413         if( colors[i] == i && color_x_min[i] != -1 )
 414         {
 415             if( ( color_y_max[i] - color_y_min[i] ) * ( color_x_max[i] - color_x_min[i] ) < 16 ) continue;
 416             j++;
 417             int x, y;
 418             y = color_y_min[i];
 419             for( x = color_x_min[i]; x <= color_x_max[i]; x++ )
 420             {
 421                 p_outpix[y*i_src_pitch+x] = 0xff;
 422             }
 423             y = color_y_max[i];
 424             for( x = color_x_min[i]; x <= color_x_max[i]; x++ )
 425             {
 426                 p_outpix[y*i_src_pitch+x] = 0xff;
 427             }
 428             x = color_x_min[i];
 429             for( y = color_y_min[i]; y <= color_y_max[i]; y++ )
 430             {
 431                 p_outpix[y*i_src_pitch+x] = 0xff;
 432             }
 433             x = color_x_max[i];
 434             for( y = color_y_min[i]; y <= color_y_max[i]; y++ )
 435             {
 436                 p_outpix[y*i_src_pitch+x] = 0xff;
 437             }
 438         }
 439     }
 440     msg_Dbg( p_filter, "Counted %d moving shapes.", j);
 441
 442     /**
 443      * We're done. Lets keep a copy of the picture
 444      */
 445     p_filter->p_libvlc->pf_memcpy( p_oldpix, p_inpix,
 446                                    i_src_pitch * i_num_lines );
 447     p_filter->p_libvlc->pf_memcpy( p_oldpix_u, p_inpix_u,
 448                                    i_src_pitch_u * i_num_lines_u );
 449     p_filter->p_libvlc->pf_memcpy( p_oldpix_v, p_inpix_v,
 450                                    i_src_pitch_u * i_num_lines_u );
 451
 452     vlc_mutex_unlock( &p_filter->p_sys->lock );
 453
 454     /* misc stuff */
 455     p_outpic->date = p_inpic->date;
 456     p_outpic->b_force = p_inpic->b_force;
 457     p_outpic->i_nb_fields = p_inpic->i_nb_fields;
 458     p_outpic->b_progressive = p_inpic->b_progressive;
 459     p_outpic->b_top_field_first = p_inpic->b_top_field_first;
 460
 461     if( p_inpic->pf_release )
 462         p_inpic->pf_release( p_inpic );
 463
 464     return p_outpic;
 465 }
 466
 467
 468 /*****************************************************************************
 469  * Gaussian Convolution
 470  *****************************************************************************
 471  *    Gaussian convolution ( sigma == 1.4 )
 472  *
 473  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 474  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 475  *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 476  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 477  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 478  *****************************************************************************/
 479 static void GaussianConvolution( uint32_t *p_inpix, uint32_t *p_smooth,
 480                                  int i_src_pitch, int i_num_lines,
 481                                  int i_src_visible )
 482 {
 483 /*    const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 484     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 485     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 486     const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;*/
 487
 488     int x,y;
 489     for( y = 2; y < i_num_lines - 2; y++ )
 490     {
 491         for( x = 2; x < i_src_visible - 2; x++ )
 492         {
 493             p_smooth[y*i_src_visible+x] = (uint32_t)(
 494               /* 2 rows up */
 495                 ( p_inpix[(y-2)*i_src_pitch+x-2] )
 496               + ((p_inpix[(y-2)*i_src_pitch+x-1]
 497               +   p_inpix[(y-2)*i_src_pitch+x]
 498               +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 499               + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 500               /* 1 row up */
 501               + ((p_inpix[(y-1)*i_src_pitch+x-2]
 502               + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 503               + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 504               + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 505               +   p_inpix[(y-1)*i_src_pitch+x+2]
 506               /* */
 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               + ( p_inpix[y*i_src_pitch+x+1]*3 )
 511               +   p_inpix[y*i_src_pitch+x+2]
 512               /* 1 row down */
 513               +   p_inpix[(y+1)*i_src_pitch+x-2]
 514               + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 515               + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 516               + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 517               +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 518               /* 2 rows down */
 519               + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 520               + ((p_inpix[(y+2)*i_src_pitch+x-1]
 521               +   p_inpix[(y+2)*i_src_pitch+x]
 522               +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 523               + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 524               ) >> 6 /* 115 */;
 525         }
 526     }
 527 }