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 #if 0
 165     p_filter->p_libvlc->pf_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
 166         p_inpic->p[U_PLANE].i_pitch * p_inpic->p[U_PLANE].i_visible_lines );
 167     p_filter->p_libvlc->pf_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
 168         p_inpic->p[V_PLANE].i_pitch * p_inpic->p[V_PLANE].i_visible_lines );
 169 #else
 170     p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
 171                                    p_inpic->p[U_PLANE].p_pixels,
 172         p_inpic->p[U_PLANE].i_pitch * p_inpic->p[U_PLANE].i_visible_lines );
 173     p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
 174                                    p_inpic->p[V_PLANE].p_pixels,
 175         p_inpic->p[V_PLANE].i_pitch * p_inpic->p[V_PLANE].i_visible_lines );
 176 #endif
 177
 178     if( !p_sys->p_oldpix || !p_sys->p_buf )
 179     {
 180         free( p_sys->p_oldpix );
 181         free( p_sys->p_buf );
 182         p_sys->p_oldpix = malloc( i_src_pitch * i_num_lines );
 183         p_sys->p_oldpix_u = malloc( i_src_pitch_u * i_num_lines_u );
 184         p_sys->p_oldpix_v = malloc( i_src_pitch_u * i_num_lines_u );
 185         p_sys->p_buf = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines );
 186         p_sys->p_buf2 = malloc( sizeof( uint32_t ) * i_src_pitch * i_num_lines);
 187         return p_inpic;
 188     }
 189     p_oldpix = p_sys->p_oldpix;
 190     p_oldpix_u = p_sys->p_oldpix_u;
 191     p_oldpix_v = p_sys->p_oldpix_v;
 192     p_buf = p_sys->p_buf;
 193     p_buf2 = p_sys->p_buf2;
 194
 195     vlc_mutex_lock( &p_filter->p_sys->lock );
 196
 197     /**
 198      * Substract Y planes
 199      */
 200     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 201     {
 202         if( p_inpix[i] > p_oldpix[i] )
 203         {
 204             p_buf2[i] = p_inpix[i] - p_oldpix[i];
 205         }
 206         else
 207         {
 208             p_buf2[i] = p_oldpix[i] - p_inpix[i];
 209         }
 210     }
 211     int line;
 212     int col;
 213     int format;
 214     switch( p_inpic->format.i_chroma )
 215     {
 216         case VLC_FOURCC('I','4','2','0'):
 217         case VLC_FOURCC('I','Y','U','V'):
 218         case VLC_FOURCC('J','4','2','0'):
 219         case VLC_FOURCC('Y','V','1','2'):
 220             format = 1;
 221             break;
 222
 223         case VLC_FOURCC('I','4','2','2'):
 224         case VLC_FOURCC('J','4','2','2'):
 225             format = 2;
 226             break;
 227
 228         default:
 229             format = 0;
 230             msg_Warn( p_filter, "Not taking chroma into account" );
 231             break;
 232     }
 233     format = 0;
 234     if( format )
 235     {
 236         for( line = 0; line < i_num_lines_u; line++ )
 237         {
 238             for( col = 0; col < i_src_pitch_u; col ++ )
 239             {
 240                 int diff;
 241                 i = line * i_src_pitch_u + col;
 242                 if( p_inpix_u[i] > p_oldpix_u[i] )
 243                 {
 244                     diff = p_inpix_u[i] - p_oldpix_u[i];
 245                 }
 246                 else
 247                 {
 248                     diff = p_oldpix_u[i] - p_inpix_u[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 #if 1
 272     GaussianConvolution( p_buf2, p_buf, i_src_pitch, i_num_lines, i_src_visible );
 273
 274 #else
 275     uint32_t *pouet = p_buf2;
 276     p_buf2 = p_buf;
 277     p_buf = pouet;
 278 #endif
 279     /**
 280      * Copy luminance plane
 281      */
 282     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 283     {
 284         /*if( p_buf[i] > 25 )
 285         {
 286             //p_outpix[i] = 255;
 287         }
 288         else// if( p_buf[i] > 15 )*/
 289         {
 290             p_outpix[i] = p_inpix[i];
 291         }
 292         /*else
 293         {
 294             p_outpix[i] = 0;
 295         }*/
 296     }
 297
 298     /**
 299      * Label the shapes ans build the labels dependencies list
 300      */
 301     last = 1;
 302     int colors[5000];
 303     int color_x_min[5000];
 304     int color_x_max[5000];
 305     int color_y_min[5000];
 306     int color_y_max[5000];
 307
 308     for( j = 0; j < i_src_pitch; j++ )
 309     {
 310         p_buf[j] = 0;
 311         p_buf[(i_num_lines-1)*i_src_pitch+j] = 0;
 312     }
 313     for( i = 1; i < i_num_lines-1; i++ )
 314     {
 315         p_buf[i*i_src_pitch] = 0;
 316         for( j = 1; j < i_src_pitch-1; j++ )
 317         {
 318             if( p_buf[i*i_src_pitch+j] > 15 )
 319             {
 320                 if( p_buf[(i-1)*i_src_pitch+j-1] )
 321                 {
 322                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j-1];
 323                 }
 324                 else if( p_buf[(i-1)*i_src_pitch+j] )
 325                     p_buf[i*i_src_pitch+j] = p_buf[(i-1)*i_src_pitch+j];
 326                 else if( p_buf[i*i_src_pitch+j-1] )
 327                     p_buf[i*i_src_pitch+j] = p_buf[i*i_src_pitch+j-1];
 328                 else
 329                 {
 330                     p_buf[i*i_src_pitch+j] = last;
 331                     colors[last] = last;
 332                     last++;
 333                 }
 334                 #define CHECK( A ) \
 335                 if( p_buf[A] && p_buf[A] != p_buf[i*i_src_pitch+j] ) \
 336                 { \
 337                     if( p_buf[A] < p_buf[i*i_src_pitch+j] ) \
 338                         colors[p_buf[i*i_src_pitch+j]] = p_buf[A]; \
 339                     else \
 340                         colors[p_buf[A]] = p_buf[i*i_src_pitch+j]; \
 341                 }
 342                 CHECK( i*i_src_pitch+j-1 );
 343                 CHECK( (i-1)*i_src_pitch+j-1 );
 344                 CHECK( (i-1)*i_src_pitch+j );
 345                 CHECK( (i-1)*i_src_pitch+j+1 );
 346             }
 347             else
 348             {
 349                 p_buf[i*i_src_pitch+j] = 0;
 350             }
 351         }
 352         p_buf[i*i_src_pitch+j] = 0;
 353     }
 354
 355     /**
 356      * Initialise empty rectangle list
 357      */
 358     for( i = 1; i < last; i++ )
 359     {
 360         color_x_min[i] = -1;
 361         color_x_max[i] = -1;
 362         color_y_min[i] = -1;
 363         color_y_max[i] = -1;
 364     }
 365
 366     /**
 367      * Compute rectangle coordinates
 368      */
 369     for( i = 0; i < i_src_pitch * i_num_lines; i++ )
 370     {
 371         if( p_buf[i] )
 372         {
 373             while( colors[p_buf[i]] != p_buf[i] )
 374                 p_buf[i] = colors[p_buf[i]];
 375             //p_outpix[i] = /*(p_buf[i]%2) */ 0xff;
 376             if( color_x_min[p_buf[i]] == -1 )
 377             {
 378                 color_x_min[p_buf[i]] =
 379                 color_x_max[p_buf[i]] = i % i_src_pitch;
 380                 color_y_min[p_buf[i]] =
 381                 color_y_max[p_buf[i]] = i / i_src_pitch;
 382             }
 383             else
 384             {
 385                 int x = i % i_src_pitch, y = i / i_src_pitch;
 386                 if( x < color_x_min[p_buf[i]] )
 387                     color_x_min[p_buf[i]] = x;
 388                 if( x > color_x_max[p_buf[i]] )
 389                     color_x_max[p_buf[i]] = x;
 390                 if( y < color_y_min[p_buf[i]] )
 391                     color_y_min[p_buf[i]] = y;
 392                 if( y > color_y_max[p_buf[i]] )
 393                     color_y_max[p_buf[i]] = y;
 394             }
 395         }
 396     }
 397
 398     /**
 399      * Merge overlaping rectangles
 400      */
 401     for( i = 1; i < last; i++ )
 402     {
 403         if( colors[i] != i ) continue;
 404         if( color_x_min[i] == -1 ) continue;
 405         for( j = i+1; j < last; j++ )
 406         {
 407             if( colors[j] != j ) continue;
 408             if( color_x_min[j] == -1 ) continue;
 409 #define max( a, b ) ( a > b ? a : b )
 410 #define min( a, b ) ( a < b ? a : b )
 411             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] ) )
 412             {
 413                 color_x_min[i] = min( color_x_min[i], color_x_min[j] );
 414                 color_x_max[i] = max( color_x_max[i], color_x_max[j] );
 415                 color_y_min[i] = min( color_y_min[i], color_y_min[j] );
 416                 color_y_max[i] = max( color_y_max[i], color_y_max[j] );
 417                 color_x_min[j] = -1;
 418                 j = 0;
 419             }
 420         }
 421     }
 422
 423     /**
 424      * Count final number of shapes
 425      * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
 426      */
 427     j = 0;
 428     for( i = 1; i < last; i++ )
 429     {
 430         if( colors[i] == i && color_x_min[i] != -1 )
 431         {
 432             if( ( color_y_max[i] - color_y_min[i] ) * ( color_x_max[i] - color_x_min[i] ) < 16 ) continue;
 433             j++;
 434             int x, y;
 435 #if 1
 436             y = color_y_min[i];
 437             for( x = color_x_min[i]; x <= color_x_max[i]; x++ )
 438             {
 439                 p_outpix[y*i_src_pitch+x] = 0xff;
 440             }
 441             y = color_y_max[i];
 442             for( x = color_x_min[i]; x <= color_x_max[i]; x++ )
 443             {
 444                 p_outpix[y*i_src_pitch+x] = 0xff;
 445             }
 446             x = color_x_min[i];
 447             for( y = color_y_min[i]; y <= color_y_max[i]; y++ )
 448             {
 449                 p_outpix[y*i_src_pitch+x] = 0xff;
 450             }
 451             x = color_x_max[i];
 452             for( y = color_y_min[i]; y <= color_y_max[i]; y++ )
 453             {
 454                 p_outpix[y*i_src_pitch+x] = 0xff;
 455             }
 456 #else
 457             for( x = color_x_min[i]; x <= color_x_max[i]; x++ )
 458             {
 459                 for( y = color_y_min[i]; y <= color_y_max[i]; y++ )
 460                 {
 461                     p_outpix[y*i_src_pitch+x] = 0x0;
 462                         //p_inpix[y*i_src_pitch+x];
 463                 }
 464             }
 465 #endif
 466         }
 467     }
 468     printf("counted %d moving shapes\n", j);
 469
 470     /**
 471      * We're done. Lets keep a copy of the Y plane
 472      */
 473     p_filter->p_libvlc->pf_memcpy( p_oldpix, p_inpix,
 474                                    i_src_pitch * i_num_lines );
 475     p_filter->p_libvlc->pf_memcpy( p_oldpix_u, p_inpix_u,
 476                                    i_src_pitch_u * i_num_lines_u );
 477     p_filter->p_libvlc->pf_memcpy( p_oldpix_v, p_inpix_v,
 478                                    i_src_pitch_u * i_num_lines_u );
 479
 480     vlc_mutex_unlock( &p_filter->p_sys->lock );
 481
 482     /* misc stuff */
 483     p_outpic->date = p_inpic->date;
 484     p_outpic->b_force = p_inpic->b_force;
 485     p_outpic->i_nb_fields = p_inpic->i_nb_fields;
 486     p_outpic->b_progressive = p_inpic->b_progressive;
 487     p_outpic->b_top_field_first = p_inpic->b_top_field_first;
 488
 489     if( p_inpic->pf_release )
 490         p_inpic->pf_release( p_inpic );
 491
 492     return p_outpic;
 493 }
 494
 495
 496 /*****************************************************************************
 497  * Gaussian Convolution
 498  *****************************************************************************
 499  *    Gaussian convolution ( sigma == 1.4 )
 500  *
 501  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 502  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 503  *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 504  *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 505  *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 506  *****************************************************************************/
 507 static void GaussianConvolution( uint32_t *p_inpix, uint32_t *p_smooth,
 508                                  int i_src_pitch, int i_num_lines,
 509                                  int i_src_visible )
 510 {
 511 /*    const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 512     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 513     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 514     const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;*/
 515
 516     int x,y;
 517     for( y = 2; y < i_num_lines - 2; y++ )
 518     {
 519         for( x = 2; x < i_src_visible - 2; x++ )
 520         {
 521             p_smooth[y*i_src_visible+x] = (uint32_t)(
 522               /* 2 rows up */
 523                 ( p_inpix[(y-2)*i_src_pitch+x-2] )
 524               + ((p_inpix[(y-2)*i_src_pitch+x-1]
 525               +   p_inpix[(y-2)*i_src_pitch+x]
 526               +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 527               + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 528               /* 1 row up */
 529               + ((p_inpix[(y-1)*i_src_pitch+x-2]
 530               + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 531               + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 532               + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 533               +   p_inpix[(y-1)*i_src_pitch+x+2]
 534               /* */
 535               +   p_inpix[y*i_src_pitch+x-2]
 536               + ( p_inpix[y*i_src_pitch+x-1]*3 )
 537               + ( p_inpix[y*i_src_pitch+x]<<2 )
 538               + ( p_inpix[y*i_src_pitch+x+1]*3 )
 539               +   p_inpix[y*i_src_pitch+x+2]
 540               /* 1 row down */
 541               +   p_inpix[(y+1)*i_src_pitch+x-2]
 542               + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 543               + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 544               + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 545               +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 546               /* 2 rows down */
 547               + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 548               + ((p_inpix[(y+2)*i_src_pitch+x-1]
 549               +   p_inpix[(y+2)*i_src_pitch+x]
 550               +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 551               + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 552               ) >> 6 /* 115 */;
 553         }
 554     }
 555 }