1 /*****************************************************************************
2 * motiondetect.c : Second version of a motion detection plugin.
3 *****************************************************************************
4 * Copyright (C) 2000-2008 VLC authors and VideoLAN
7 * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * 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 void GaussianConvolution( uint32_t *, uint32_t *, int, int, int );
64 static int FindShapes( uint32_t *, uint32_t *, int, int, int,
65 int *, int *, int *, int *, int *);
66 static void Draw( filter_t *p_filter, uint8_t *p_pix, int i_pix_pitch, int i_pix_size );
67 #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;
96 switch( p_fmt->i_chroma )
103 is_yuv_planar = false;
107 msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
108 (char*)&(p_fmt->i_chroma) );
111 p_filter->pf_video_filter = Filter;
113 /* Allocate structure */
114 p_filter->p_sys = p_sys = malloc( sizeof( filter_sys_t ) );
115 if( p_filter->p_sys == NULL )
118 p_sys->is_yuv_planar = is_yuv_planar;
119 p_sys->b_old = false;
120 p_sys->p_old = picture_NewFromFormat( p_fmt );
121 p_sys->p_buf = calloc( p_fmt->i_width * p_fmt->i_height, sizeof(*p_sys->p_buf) );
122 p_sys->p_buf2 = calloc( p_fmt->i_width * p_fmt->i_height, sizeof(*p_sys->p_buf) );
124 if( !p_sys->p_old || !p_sys->p_buf || !p_sys->p_buf2 )
126 free( p_sys->p_buf2 );
127 free( p_sys->p_buf );
129 picture_Release( p_sys->p_old );
136 /*****************************************************************************
138 *****************************************************************************/
139 static void Destroy( vlc_object_t *p_this )
141 filter_t *p_filter = (filter_t *)p_this;
142 filter_sys_t *p_sys = p_filter->p_sys;
144 free( p_sys->p_buf2 );
145 free( p_sys->p_buf );
146 picture_Release( p_sys->p_old );
151 /*****************************************************************************
152 * Filter YUV Planar/Packed
153 *****************************************************************************/
154 static void PreparePlanar( filter_t *p_filter, picture_t *p_inpic )
156 filter_sys_t *p_sys = p_filter->p_sys;
157 const video_format_t *p_fmt = &p_filter->fmt_in.video;
159 uint8_t *p_oldpix = p_sys->p_old->p[Y_PLANE].p_pixels;
160 const int i_old_pitch = p_sys->p_old->p[Y_PLANE].i_pitch;
162 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
163 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
168 for( unsigned y = 0; y < p_fmt->i_height; y++ )
170 for( unsigned x = 0; x < p_fmt->i_width; x++ )
171 p_sys->p_buf2[y*p_fmt->i_width+x] = abs( p_inpix[y*i_src_pitch+x] - p_oldpix[y*i_old_pitch+x] );
176 switch( p_inpic->format.i_chroma )
192 msg_Warn( p_filter, "Not taking chroma into account" );
196 const uint8_t *p_inpix_u = p_inpic->p[U_PLANE].p_pixels;
197 const uint8_t *p_inpix_v = p_inpic->p[V_PLANE].p_pixels;
198 const int i_src_pitch_u = p_inpic->p[U_PLANE].i_pitch;
199 const int i_src_pitch_v = p_inpic->p[V_PLANE].i_pitch;
201 const uint8_t *p_oldpix_u = p_sys->p_old->p[U_PLANE].p_pixels;
202 const uint8_t *p_oldpix_v = p_sys->p_old->p[V_PLANE].p_pixels;
203 const int i_old_pitch_u = p_sys->p_old->p[U_PLANE].i_pitch;
204 const int i_old_pitch_v = p_sys->p_old->p[V_PLANE].i_pitch;
206 for( unsigned y = 0; y < p_fmt->i_height/i_chroma_dy; y++ )
208 for( unsigned x = 0; x < p_fmt->i_width/i_chroma_dx; x ++ )
210 const int d = abs( p_inpix_u[y*i_src_pitch_u+x] - p_oldpix_u[y*i_old_pitch_u+x] ) +
211 abs( p_inpix_v[y*i_src_pitch_v+x] - p_oldpix_v[y*i_old_pitch_v+x] );
214 for( j = 0; j < i_chroma_dy; j++ )
216 for( i = 0; i < i_chroma_dx; i++ )
217 p_sys->p_buf2[i_chroma_dy*p_fmt->i_width*j + i_chroma_dx*i] = d;
223 static int PreparePacked( filter_t *p_filter, picture_t *p_inpic, int *pi_pix_offset )
225 filter_sys_t *p_sys = p_filter->p_sys;
226 const video_format_t *p_fmt = &p_filter->fmt_in.video;
228 int i_y_offset, i_u_offset, i_v_offset;
229 if( GetPackedYuvOffsets( p_fmt->i_chroma,
230 &i_y_offset, &i_u_offset, &i_v_offset ) )
232 msg_Warn( p_filter, "Unsupported input chroma (%4.4s)",
233 (char*)&p_fmt->i_chroma );
236 *pi_pix_offset = i_y_offset;
238 /* Substract all planes at once */
239 uint8_t *p_oldpix = p_sys->p_old->p[Y_PLANE].p_pixels;
240 const int i_old_pitch = p_sys->p_old->p[Y_PLANE].i_pitch;
242 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
243 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
245 for( unsigned y = 0; y < p_fmt->i_height; y++ )
247 for( unsigned x = 0; x < p_fmt->i_width; x+=2 )
250 d = abs( p_inpix[y*i_src_pitch+2*x+i_u_offset] - p_oldpix[y*i_old_pitch+2*x+i_u_offset] ) +
251 abs( p_inpix[y*i_src_pitch+2*x+i_v_offset] - p_oldpix[y*i_old_pitch+2*x+i_v_offset] );
253 for( int i = 0; i < 2; i++ )
254 p_sys->p_buf2[y*p_fmt->i_width+x+i] =
255 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;
261 static picture_t *Filter( filter_t *p_filter, picture_t *p_inpic )
263 filter_sys_t *p_sys = p_filter->p_sys;
268 picture_t *p_outpic = filter_NewPicture( p_filter );
271 picture_Release( p_inpic );
274 picture_Copy( p_outpic, p_inpic );
278 picture_Copy( p_sys->p_old, p_inpic );
285 if( p_sys->is_yuv_planar )
287 PreparePlanar( p_filter, p_inpic );
293 if( PreparePacked( p_filter, p_inpic, &i_pix_offset ) )
299 * Get the areas where movement was detected
301 const video_format_t *p_fmt = &p_filter->fmt_in.video;
302 p_sys->i_colors = FindShapes( p_sys->p_buf2, p_sys->p_buf, p_fmt->i_width, p_fmt->i_width, p_fmt->i_height,
303 p_sys->colors, p_sys->color_x_min, p_sys->color_x_max, p_sys->color_y_min, p_sys->color_y_max );
306 * Count final number of shapes
307 * Draw rectangles (there can be more than 1 moving shape in 1 rectangle)
309 Draw( p_filter, &p_outpic->p[Y_PLANE].p_pixels[i_pix_offset], p_outpic->p[Y_PLANE].i_pitch, i_pix_size );
312 * We're done. Lets keep a copy of the picture
313 * TODO we may just picture_Release with a latency of 1 if the filters/vout
314 * handle it correctly */
315 picture_Copy( p_sys->p_old, p_inpic );
318 picture_Release( p_inpic );
323 /*****************************************************************************
324 * Gaussian Convolution
325 *****************************************************************************
326 * Gaussian convolution ( sigma == 1.4 )
328 * | 2 4 5 4 2 | | 2 4 4 4 2 |
329 * | 4 9 12 9 4 | | 4 8 12 8 4 |
330 * | 5 12 15 12 5 | ~ | 4 12 16 12 4 |
331 * | 4 9 12 9 4 | | 4 8 12 8 4 |
332 * | 2 4 5 4 2 | | 2 4 4 4 2 |
333 *****************************************************************************/
334 static void GaussianConvolution( uint32_t *p_inpix, uint32_t *p_smooth,
335 int i_src_pitch, int i_num_lines,
340 /* A bit overkill but ... simpler */
341 memset( p_smooth, 0, sizeof(*p_smooth) * i_src_pitch * i_num_lines );
343 for( y = 2; y < i_num_lines - 2; y++ )
345 for( x = 2; x < i_src_visible - 2; x++ )
347 p_smooth[y*i_src_visible+x] = (uint32_t)(
349 ( p_inpix[(y-2)*i_src_pitch+x-2] )
350 + ((p_inpix[(y-2)*i_src_pitch+x-1]
351 + p_inpix[(y-2)*i_src_pitch+x]
352 + p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
353 + ( p_inpix[(y-2)*i_src_pitch+x+2] )
355 + ((p_inpix[(y-1)*i_src_pitch+x-2]
356 + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
357 + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
358 + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
359 + p_inpix[(y-1)*i_src_pitch+x+2]
361 + p_inpix[y*i_src_pitch+x-2]
362 + ( p_inpix[y*i_src_pitch+x-1]*3 )
363 + ( p_inpix[y*i_src_pitch+x]<<2 )
364 + ( p_inpix[y*i_src_pitch+x+1]*3 )
365 + p_inpix[y*i_src_pitch+x+2]
367 + p_inpix[(y+1)*i_src_pitch+x-2]
368 + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
369 + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
370 + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
371 + p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
373 + ( p_inpix[(y+2)*i_src_pitch+x-2] )
374 + ((p_inpix[(y+2)*i_src_pitch+x-1]
375 + p_inpix[(y+2)*i_src_pitch+x]
376 + p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
377 + ( p_inpix[(y+2)*i_src_pitch+x+2] )
383 /*****************************************************************************
385 *****************************************************************************/
386 static int FindShapes( uint32_t *p_diff, uint32_t *p_smooth,
387 int i_pitch, int i_visible, int i_lines,
389 int *color_x_min, int *color_x_max,
390 int *color_y_min, int *color_y_max )
396 * Apply some smoothing to remove noise
398 GaussianConvolution( p_diff, p_smooth, i_pitch, i_lines, i_visible );
401 * Label the shapes and build the labels dependencies list
403 for( j = 0; j < i_pitch; j++ )
406 p_smooth[(i_lines-1)*i_pitch+j] = 0;
408 for( i = 1; i < i_lines-1; i++ )
410 p_smooth[i*i_pitch] = 0;
411 for( j = 1; j < i_pitch-1; j++ )
413 if( p_smooth[i*i_pitch+j] > 15 )
415 if( p_smooth[(i-1)*i_pitch+j-1] )
417 p_smooth[i*i_pitch+j] = p_smooth[(i-1)*i_pitch+j-1];
419 else if( p_smooth[(i-1)*i_pitch+j] )
420 p_smooth[i*i_pitch+j] = p_smooth[(i-1)*i_pitch+j];
421 else if( p_smooth[i*i_pitch+j-1] )
422 p_smooth[i*i_pitch+j] = p_smooth[i*i_pitch+j-1];
425 if( last < NUM_COLORS )
427 p_smooth[i*i_pitch+j] = last;
433 if( p_smooth[A] && p_smooth[A] != p_smooth[i*i_pitch+j] ) \
435 if( p_smooth[A] < p_smooth[i*i_pitch+j] ) \
436 colors[p_smooth[i*i_pitch+j]] = p_smooth[A]; \
438 colors[p_smooth[A]] = p_smooth[i*i_pitch+j]; \
440 CHECK( i*i_pitch+j-1 );
441 CHECK( (i-1)*i_pitch+j-1 );
442 CHECK( (i-1)*i_pitch+j );
443 CHECK( (i-1)*i_pitch+j+1 );
448 p_smooth[i*i_pitch+j] = 0;
451 p_smooth[i*i_pitch+j] = 0;
455 * Initialise empty rectangle list
457 for( i = 1; i < last; i++ )
466 * Compute rectangle coordinates
468 for( i = 0; i < i_pitch * i_lines; i++ )
472 while( colors[p_smooth[i]] != (int)p_smooth[i] )
473 p_smooth[i] = colors[p_smooth[i]];
474 if( color_x_min[p_smooth[i]] == -1 )
476 color_x_min[p_smooth[i]] =
477 color_x_max[p_smooth[i]] = i % i_pitch;
478 color_y_min[p_smooth[i]] =
479 color_y_max[p_smooth[i]] = i / i_pitch;
483 int x = i % i_pitch, y = i / i_pitch;
484 if( x < color_x_min[p_smooth[i]] )
485 color_x_min[p_smooth[i]] = x;
486 if( x > color_x_max[p_smooth[i]] )
487 color_x_max[p_smooth[i]] = x;
488 if( y < color_y_min[p_smooth[i]] )
489 color_y_min[p_smooth[i]] = y;
490 if( y > color_y_max[p_smooth[i]] )
491 color_y_max[p_smooth[i]] = y;
497 * Merge overlaping rectangles
499 for( i = 1; i < last; i++ )
501 if( colors[i] != i ) continue;
502 if( color_x_min[i] == -1 ) continue;
503 for( j = i+1; j < last; j++ )
505 if( colors[j] != j ) continue;
506 if( color_x_min[j] == -1 ) continue;
507 if( __MAX( color_x_min[i], color_x_min[j] ) < __MIN( color_x_max[i], color_x_max[j] ) &&
508 __MAX( color_y_min[i], color_y_min[j] ) < __MIN( color_y_max[i], color_y_max[j] ) )
510 color_x_min[i] = __MIN( color_x_min[i], color_x_min[j] );
511 color_x_max[i] = __MAX( color_x_max[i], color_x_max[j] );
512 color_y_min[i] = __MIN( color_y_min[i], color_y_min[j] );
513 color_y_max[i] = __MAX( color_y_max[i], color_y_max[j] );
523 static void Draw( filter_t *p_filter, uint8_t *p_pix, int i_pix_pitch, int i_pix_size )
525 filter_sys_t *p_sys = p_filter->p_sys;
528 for( i = 1, j = 0; i < p_sys->i_colors; i++ )
532 if( p_sys->colors[i] != i )
535 const int color_x_min = p_sys->color_x_min[i];
536 const int color_x_max = p_sys->color_x_max[i];
537 const int color_y_min = p_sys->color_y_min[i];
538 const int color_y_max = p_sys->color_y_max[i];
540 if( color_x_min == -1 )
542 if( ( color_y_max - color_y_min ) * ( color_x_max - color_x_min ) < 16 )
548 for( x = color_x_min; x <= color_x_max; x++ )
549 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
552 for( x = color_x_min; x <= color_x_max; x++ )
553 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
556 for( y = color_y_min; y <= color_y_max; y++ )
557 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
560 for( y = color_y_min; y <= color_y_max; y++ )
561 p_pix[y*i_pix_pitch+x*i_pix_size] = 0xff;
563 msg_Dbg( p_filter, "Counted %d moving shapes.", j );