1 /*****************************************************************************
2 * motiondetec.c : Second version of a motion detection plugin.
3 *****************************************************************************
4 * Copyright (C) 2000-2008 the VideoLAN team
7 * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
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.
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.
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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
36 #include <vlc_filter.h>
37 #include "filter_picture.h"
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Create ( vlc_object_t * );
43 static void Destroy ( vlc_object_t * );
45 #define FILTER_PREFIX "motiondetect-"
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 )
54 add_shortcut( "motion" )
55 set_callbacks( Create, Destroy )
59 /*****************************************************************************
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)
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];
86 /*****************************************************************************
88 *****************************************************************************/
89 static int Create( vlc_object_t *p_this )
91 filter_t *p_filter = (filter_t *)p_this;
92 const video_format_t *p_fmt = &p_filter->fmt_in.video;
95 switch( p_fmt->i_chroma )
98 p_filter->pf_video_filter = Filter;
102 p_filter->pf_video_filter = FilterPacked;
106 msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
107 (char*)&(p_fmt->i_chroma) );
111 /* Allocate structure */
112 p_filter->p_sys = p_sys = malloc( sizeof( filter_sys_t ) );
113 if( p_filter->p_sys == NULL )
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) );
121 if( !p_sys->p_old || !p_sys->p_buf || !p_sys->p_buf2 )
123 free( p_sys->p_buf2 );
124 free( p_sys->p_buf );
126 picture_Release( p_sys->p_old );
133 /*****************************************************************************
135 *****************************************************************************/
136 static void Destroy( vlc_object_t *p_this )
138 filter_t *p_filter = (filter_t *)p_this;
139 filter_sys_t *p_sys = p_filter->p_sys;
141 free( p_sys->p_buf2 );
142 free( p_sys->p_buf );
143 picture_Release( p_sys->p_old );
148 /*****************************************************************************
150 *****************************************************************************/
151 static picture_t *Filter( filter_t *p_filter, picture_t *p_inpic )
153 filter_sys_t *p_sys = p_filter->p_sys;
154 const video_format_t *p_fmt = &p_filter->fmt_in.video;
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;
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;
173 picture_Copy( p_sys->p_old, p_inpic );
178 p_outpic = filter_NewPicture( p_filter );
181 picture_Release( p_inpic );
184 picture_Copy( p_outpic, p_inpic );
189 for( y = 0; y < p_fmt->i_height; y++ )
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] );
197 switch( p_inpic->format.i_chroma )
213 msg_Warn( p_filter, "Not taking chroma into account" );
219 if( i_chroma_dx != 0 && i_chroma_dy != 0 )
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;
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;
231 for( y = 0; y < p_fmt->i_height/i_chroma_dy; y++ )
233 for( x = 0; x < p_fmt->i_width/i_chroma_dx; x ++ )
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] );
239 for( j = 0; j < i_chroma_dy; j++ )
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;
249 * Get the areas where movement was detected
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 );
255 * Count final number of shapes
256 * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
258 Draw( p_filter, p_outpic->p[Y_PLANE].p_pixels, p_outpic->p[Y_PLANE].i_pitch, 1 );
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 );
266 picture_Release( p_inpic );
270 /*****************************************************************************
272 *****************************************************************************/
273 static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_inpic )
275 filter_sys_t *p_sys = p_filter->p_sys;
276 const video_format_t *p_fmt = &p_filter->fmt_in.video;
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;
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;
287 int i_y_offset, i_u_offset, i_v_offset;
291 if( GetPackedYuvOffsets( p_fmt->i_chroma,
292 &i_y_offset, &i_u_offset, &i_v_offset ) )
294 msg_Warn( p_filter, "Unsupported input chroma (%4.4s)",
295 (char*)&p_fmt->i_chroma );
301 picture_Copy( p_sys->p_old, p_inpic );
306 p_outpic = filter_NewPicture( p_filter );
309 picture_Release( p_inpic );
312 picture_Copy( p_outpic, p_inpic );
314 /* Substract all planes at once */
316 for( y = 0; y < p_fmt->i_height; y++ )
318 for( x = 0; x < p_fmt->i_width; x+=2 )
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] );
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;
333 * Get the areas where movement was detected
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 );
339 * Count final number of shapes
340 * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
342 Draw( p_filter, &p_outpic->p[Y_PLANE].p_pixels[i_y_offset], p_outpic->p[Y_PLANE].i_pitch, 2 );
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 );
350 picture_Release( p_inpic );
356 /*****************************************************************************
357 * Gaussian Convolution
358 *****************************************************************************
359 * Gaussian convolution ( sigma == 1.4 )
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,
373 /* A bit overkill but ... simpler */
374 memset( p_smooth, 0, sizeof(*p_smooth) * i_src_pitch * i_num_lines );
376 for( y = 2; y < i_num_lines - 2; y++ )
378 for( x = 2; x < i_src_visible - 2; x++ )
380 p_smooth[y*i_src_visible+x] = (uint32_t)(
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] )
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]
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]
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 )
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] )
416 /*****************************************************************************
418 *****************************************************************************/
419 static int FindShapes( uint32_t *p_diff, uint32_t *p_smooth,
420 int i_pitch, int i_visible, int i_lines,
422 int *color_x_min, int *color_x_max,
423 int *color_y_min, int *color_y_max )
429 * Apply some smoothing to remove noise
431 GaussianConvolution( p_diff, p_smooth, i_pitch, i_lines, i_visible );
434 * Label the shapes and build the labels dependencies list
436 for( j = 0; j < i_pitch; j++ )
439 p_smooth[(i_lines-1)*i_pitch+j] = 0;
441 for( i = 1; i < i_lines-1; i++ )
443 p_smooth[i*i_pitch] = 0;
444 for( j = 1; j < i_pitch-1; j++ )
446 if( p_smooth[i*i_pitch+j] > 15 )
448 if( p_smooth[(i-1)*i_pitch+j-1] )
450 p_smooth[i*i_pitch+j] = p_smooth[(i-1)*i_pitch+j-1];
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];
458 if( last < NUM_COLORS )
460 p_smooth[i*i_pitch+j] = last;
466 if( p_smooth[A] && p_smooth[A] != p_smooth[i*i_pitch+j] ) \
468 if( p_smooth[A] < p_smooth[i*i_pitch+j] ) \
469 colors[p_smooth[i*i_pitch+j]] = p_smooth[A]; \
471 colors[p_smooth[A]] = p_smooth[i*i_pitch+j]; \
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 );
481 p_smooth[i*i_pitch+j] = 0;
484 p_smooth[i*i_pitch+j] = 0;
488 * Initialise empty rectangle list
490 for( i = 1; i < last; i++ )
499 * Compute rectangle coordinates
501 for( i = 0; i < i_pitch * i_lines; i++ )
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 )
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;
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;
530 * Merge overlaping rectangles
532 for( i = 1; i < last; i++ )
534 if( colors[i] != i ) continue;
535 if( color_x_min[i] == -1 ) continue;
536 for( j = i+1; j < last; j++ )
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] ) )
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] );
556 static void Draw( filter_t *p_filter, uint8_t *p_pix, int i_pix_pitch, int i_pix_size )
558 filter_sys_t *p_sys = p_filter->p_sys;
561 for( i = 1, j = 0; i < p_sys->i_colors; i++ )
565 if( p_sys->colors[i] != i )
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];
573 if( color_x_min == -1 )
575 if( ( color_y_max - color_y_min ) * ( color_x_max - color_x_min ) < 16 )
581 for( x = color_x_min; x <= color_x_max; x++ )
582 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
585 for( x = color_x_min; x <= color_x_max; x++ )
586 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
589 for( y = color_y_min; y <= color_y_max; y++ )
590 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
593 for( y = color_y_min; y <= color_y_max; y++ )
594 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
596 msg_Dbg( p_filter, "Counted %d moving shapes.", j );