1 /*****************************************************************************
2 * gradient.c : Gradient and edge detection video effects plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2006 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Antoine Cellerier <dionoea -at- videolan -dot- org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
28 #include <stdlib.h> /* malloc(), free() */
31 #include <math.h> /* sin(), cos() */
37 #include "vlc_filter.h"
39 enum { GRADIENT, EDGE, HOUGH };
41 /*****************************************************************************
43 *****************************************************************************/
44 static int Create ( vlc_object_t * );
45 static void Destroy ( vlc_object_t * );
47 static picture_t *Filter( filter_t *, picture_t * );
48 static int GradientCallback( vlc_object_t *, char const *,
49 vlc_value_t, vlc_value_t,
52 static void FilterGradient( filter_t *, picture_t *, picture_t * );
53 static void FilterEdge ( filter_t *, picture_t *, picture_t * );
54 static void FilterHough ( filter_t *, picture_t *, picture_t * );
56 /*****************************************************************************
58 *****************************************************************************/
59 #define MODE_TEXT N_("Distort mode")
60 #define MODE_LONGTEXT N_("Distort mode, one of \"gradient\", \"edge\" and \"hough\".")
62 #define GRADIENT_TEXT N_("Gradient image type")
63 #define GRADIENT_LONGTEXT N_("Gradient image type (0 or 1). 0 will " \
64 "turn the image to white while 1 will keep colors." )
66 #define CARTOON_TEXT N_("Apply cartoon effect")
67 #define CARTOON_LONGTEXT N_("Apply cartoon effect. It is only used by " \
68 "\"gradient\" and \"edge\".")
70 static const char *mode_list[] = { "gradient", "edge", "hough" };
71 static const char *mode_list_text[] = { N_("Gradient"), N_("Edge"), N_("Hough") };
73 #define FILTER_PREFIX "gradient-"
76 set_description( _("Gradient video filter") );
77 set_shortname( _( "Gradient" ));
78 set_capability( "video filter2", 0 );
79 set_category( CAT_VIDEO );
80 set_subcategory( SUBCAT_VIDEO_VFILTER );
82 add_string( FILTER_PREFIX "mode", "gradient", NULL,
83 MODE_TEXT, MODE_LONGTEXT, VLC_FALSE );
84 change_string_list( mode_list, mode_list_text, 0 );
86 add_integer_with_range( FILTER_PREFIX "type", 0, 0, 1, NULL,
87 GRADIENT_TEXT, GRADIENT_LONGTEXT, VLC_FALSE );
88 add_bool( FILTER_PREFIX "cartoon", 1, NULL,
89 CARTOON_TEXT, CARTOON_LONGTEXT, VLC_FALSE );
91 add_shortcut( "gradient" );
92 set_callbacks( Create, Destroy );
95 static const char *ppsz_filter_options[] = {
96 "mode", "type", "cartoon", NULL
99 /*****************************************************************************
100 * vout_sys_t: Distort video output method descriptor
101 *****************************************************************************
102 * This structure is part of the video output thread descriptor.
103 * It describes the Distort specific properties of an output thread.
104 *****************************************************************************/
109 /* For the gradient mode */
111 vlc_bool_t b_cartoon;
114 uint32_t *p_buf32_bis;
121 /*****************************************************************************
122 * Create: allocates Distort video thread output method
123 *****************************************************************************
124 * This function allocates and initializes a Distort vout method.
125 *****************************************************************************/
126 static int Create( vlc_object_t *p_this )
128 filter_t *p_filter = (filter_t *)p_this;
131 /* Allocate structure */
132 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
133 if( p_filter->p_sys == NULL )
135 msg_Err( p_filter, "out of memory" );
139 p_filter->pf_video_filter = Filter;
141 p_filter->p_sys->p_pre_hough = NULL;
143 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
147 var_CreateGetNonEmptyStringCommand( p_filter, FILTER_PREFIX "mode" )) )
149 msg_Err( p_filter, "configuration variable "
150 FILTER_PREFIX "mode empty" );
151 p_filter->p_sys->i_mode = GRADIENT;
155 if( !strcmp( psz_method, "gradient" ) )
157 p_filter->p_sys->i_mode = GRADIENT;
159 else if( !strcmp( psz_method, "edge" ) )
161 p_filter->p_sys->i_mode = EDGE;
163 else if( !strcmp( psz_method, "hough" ) )
165 p_filter->p_sys->i_mode = HOUGH;
169 msg_Err( p_filter, "no valid gradient mode provided" );
170 p_filter->p_sys->i_mode = GRADIENT;
175 p_filter->p_sys->i_gradient_type =
176 var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "type" );
177 p_filter->p_sys->b_cartoon =
178 var_CreateGetBoolCommand( p_filter, FILTER_PREFIX "cartoon" );
180 var_AddCallback( p_filter, FILTER_PREFIX "mode",
181 GradientCallback, p_filter->p_sys );
182 var_AddCallback( p_filter, FILTER_PREFIX "type",
183 GradientCallback, p_filter->p_sys );
184 var_AddCallback( p_filter, FILTER_PREFIX "cartoon",
185 GradientCallback, p_filter->p_sys );
187 p_filter->p_sys->p_buf32 = NULL;
188 p_filter->p_sys->p_buf32_bis = NULL;
189 p_filter->p_sys->p_buf8 = NULL;
194 /*****************************************************************************
195 * Destroy: destroy Distort video thread output method
196 *****************************************************************************
197 * Terminate an output method created by DistortCreateOutputMethod
198 *****************************************************************************/
199 static void Destroy( vlc_object_t *p_this )
201 filter_t *p_filter = (filter_t *)p_this;
203 free( p_filter->p_sys->p_buf32 );
204 free( p_filter->p_sys->p_buf32_bis );
205 free( p_filter->p_sys->p_buf8 );
206 free( p_filter->p_sys->p_pre_hough );
208 free( p_filter->p_sys );
211 /*****************************************************************************
212 * Render: displays previously rendered output
213 *****************************************************************************
214 * This function send the currently rendered image to Distort image, waits
215 * until it is displayed and switch the two rendering buffers, preparing next
217 *****************************************************************************/
218 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
222 if( !p_pic ) return NULL;
224 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
227 msg_Warn( p_filter, "can't get output picture" );
228 if( p_pic->pf_release )
229 p_pic->pf_release( p_pic );
233 switch( p_filter->p_sys->i_mode )
236 FilterEdge( p_filter, p_pic, p_outpic );
240 FilterGradient( p_filter, p_pic, p_outpic );
244 FilterHough( p_filter, p_pic, p_outpic );
251 p_outpic->date = p_pic->date;
252 p_outpic->b_force = p_pic->b_force;
253 p_outpic->i_nb_fields = p_pic->i_nb_fields;
254 p_outpic->b_progressive = p_pic->b_progressive;
255 p_outpic->b_top_field_first = p_pic->b_top_field_first;
257 if( p_pic->pf_release )
258 p_pic->pf_release( p_pic );
263 /*****************************************************************************
264 * Gaussian Convolution
265 *****************************************************************************
266 * Gaussian convolution ( sigma == 1.4 )
268 * | 2 4 5 4 2 | | 2 4 4 4 2 |
269 * | 4 9 12 9 4 | | 4 8 12 8 4 |
270 * | 5 12 15 12 5 | ~ | 4 12 16 12 4 |
271 * | 4 9 12 9 4 | | 4 8 12 8 4 |
272 * | 2 4 5 4 2 | | 2 4 4 4 2 |
273 *****************************************************************************/
274 static void GaussianConvolution( picture_t *p_inpic, uint32_t *p_smooth )
276 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
277 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
278 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
279 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
282 for( y = 2; y < i_num_lines - 2; y++ )
284 for( x = 2; x < i_src_visible - 2; x++ )
286 p_smooth[y*i_src_visible+x] = (uint32_t)(
288 ( p_inpix[(y-2)*i_src_pitch+x-2] )
289 + ((p_inpix[(y-2)*i_src_pitch+x-1]
290 + p_inpix[(y-2)*i_src_pitch+x]
291 + p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
292 + ( p_inpix[(y-2)*i_src_pitch+x+2] )
294 + ((p_inpix[(y-1)*i_src_pitch+x-2]
295 + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
296 + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
297 + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
298 + p_inpix[(y-1)*i_src_pitch+x+2]
300 + p_inpix[y*i_src_pitch+x-2]
301 + ( p_inpix[y*i_src_pitch+x-1]*3 )
302 + ( p_inpix[y*i_src_pitch+x]<<2 )
303 + ( p_inpix[y*i_src_pitch+x+1]*3 )
304 + p_inpix[y*i_src_pitch+x+2]
306 + p_inpix[(y+1)*i_src_pitch+x-2]
307 + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
308 + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
309 + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
310 + p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
312 + ( p_inpix[(y+2)*i_src_pitch+x-2] )
313 + ((p_inpix[(y+2)*i_src_pitch+x-1]
314 + p_inpix[(y+2)*i_src_pitch+x]
315 + p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
316 + ( p_inpix[(y+2)*i_src_pitch+x+2] )
322 /*****************************************************************************
323 * FilterGradient: Sobel
324 *****************************************************************************/
325 static void FilterGradient( filter_t *p_filter, picture_t *p_inpic,
326 picture_t *p_outpic )
329 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
330 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
331 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
332 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
334 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
335 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
338 if( !p_filter->p_sys->p_buf32 )
339 p_filter->p_sys->p_buf32 =
340 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
341 p_smooth = p_filter->p_sys->p_buf32;
343 if( !p_smooth ) return;
345 if( p_filter->p_sys->b_cartoon )
347 p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
348 p_inpic->p[U_PLANE].p_pixels,
349 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
350 p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
351 p_inpic->p[V_PLANE].p_pixels,
352 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
356 p_filter->p_libvlc->pf_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
357 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
358 p_filter->p_libvlc->pf_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
359 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
362 GaussianConvolution( p_inpic, p_smooth );
367 | -2 0 2 | and | 0 0 0 |
368 | -1 0 1 | | -1 -2 -1 | */
371 for( y = 1; y < i_num_lines - 1; y++ ) \
373 for( x = 1; x < i_src_visible - 1; x++ ) \
378 ( p_smooth[(y-1)*i_src_visible+x-1] \
379 - p_smooth[(y+1)*i_src_visible+x-1] ) \
380 + ( ( p_smooth[(y-1)*i_src_visible+x] \
381 - p_smooth[(y+1)*i_src_visible+x] ) <<1 ) \
382 + ( p_smooth[(y-1)*i_src_visible+x+1] \
383 - p_smooth[(y+1)*i_src_visible+x+1] ) \
387 ( p_smooth[(y-1)*i_src_visible+x-1] \
388 - p_smooth[(y-1)*i_src_visible+x+1] ) \
389 + ( ( p_smooth[y*i_src_visible+x-1] \
390 - p_smooth[y*i_src_visible+x+1] ) <<1 ) \
391 + ( p_smooth[(y+1)*i_src_visible+x-1] \
392 - p_smooth[(y+1)*i_src_visible+x+1] ) \
395 if( p_filter->p_sys->i_gradient_type )
397 if( p_filter->p_sys->b_cartoon )
402 p_outpix[y*i_dst_pitch+x] = 0x00;
406 if( p_smooth[y*i_src_visible+x] > 0xa0 )
407 p_outpix[y*i_dst_pitch+x] =
408 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
409 else if( p_smooth[y*i_src_visible+x] > 0x70 )
410 p_outpix[y*i_dst_pitch+x] =
411 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
412 else if( p_smooth[y*i_src_visible+x] > 0x28 )
413 p_outpix[y*i_dst_pitch+x] =
414 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
416 p_outpix[y*i_dst_pitch+x] =
417 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
424 p_outpix[y*i_dst_pitch+x] = clip_uint8_vlc( a );
432 p_outpix[y*i_dst_pitch+x] = 0;
434 p_outpix[y*i_dst_pitch+x] = 0xff-(uint8_t)a;
440 /*****************************************************************************
441 * FilterEdge: Canny edge detection algorithm
442 *****************************************************************************
443 * http://fourier.eng.hmc.edu/e161/lectures/canny/node1.html
444 * (well ... my implementation isn't really the canny algorithm ... but some
445 * ideas are the same)
446 *****************************************************************************/
455 static void FilterEdge( filter_t *p_filter, picture_t *p_inpic,
456 picture_t *p_outpic )
460 const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
461 const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
462 const int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
463 const int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
465 const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
466 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
472 if( !p_filter->p_sys->p_buf32 )
473 p_filter->p_sys->p_buf32 =
474 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
475 p_smooth = p_filter->p_sys->p_buf32;
477 if( !p_filter->p_sys->p_buf32_bis )
478 p_filter->p_sys->p_buf32_bis =
479 (uint32_t *)malloc( i_num_lines * i_src_visible * sizeof(uint32_t));
480 p_grad = p_filter->p_sys->p_buf32_bis;
482 if( !p_filter->p_sys->p_buf8 )
483 p_filter->p_sys->p_buf8 =
484 (uint8_t *)malloc( i_num_lines * i_src_visible * sizeof(uint8_t));
485 p_theta = p_filter->p_sys->p_buf8;
487 if( !p_smooth || !p_grad || !p_theta ) return;
489 if( p_filter->p_sys->b_cartoon )
491 p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
492 p_inpic->p[U_PLANE].p_pixels,
493 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
494 p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
495 p_inpic->p[V_PLANE].p_pixels,
496 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
500 p_filter->p_libvlc->pf_memset( p_outpic->p[Y_PLANE].p_pixels, 0xff,
501 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
502 p_filter->p_libvlc->pf_memset( p_outpic->p[U_PLANE].p_pixels, 0x80,
503 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
504 p_filter->p_libvlc->pf_memset( p_outpic->p[V_PLANE].p_pixels, 0x80,
505 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
508 GaussianConvolution( p_inpic, p_smooth );
513 | -2 0 2 | and | 0 0 0 |
514 | -1 0 1 | | -1 -2 -1 | */
516 for( y = 1; y < i_num_lines - 1; y++ )
518 for( x = 1; x < i_src_visible - 1; x++ )
522 ( p_smooth[(y-1)*i_src_visible+x-1]
523 - p_smooth[(y+1)*i_src_visible+x-1] )
524 + ( ( p_smooth[(y-1)*i_src_visible+x]
525 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
526 + ( p_smooth[(y-1)*i_src_visible+x+1]
527 - p_smooth[(y+1)*i_src_visible+x+1] );
529 ( p_smooth[(y-1)*i_src_visible+x-1]
530 - p_smooth[(y-1)*i_src_visible+x+1] )
531 + ( ( p_smooth[y*i_src_visible+x-1]
532 - p_smooth[y*i_src_visible+x+1] ) <<1 )
533 + ( p_smooth[(y+1)*i_src_visible+x-1]
534 - p_smooth[(y+1)*i_src_visible+x+1] );
536 p_grad[y*i_src_visible+x] = (uint32_t)(abs( gradx ) + abs( grady ));
538 /* tan( 22.5 ) = 0,414213562 .. * 128 = 53
539 * tan( 26,565051177 ) = 0.5
540 * tan( 45 + 22.5 ) = 2,414213562 .. * 128 = 309
541 * tan( 63,434948823 ) 2 */
542 if( (grady<<1) > gradx )
543 p_theta[y*i_src_visible+x] = THETA_P;
544 else if( (grady<<1) < -gradx )
545 p_theta[y*i_src_visible+x] = THETA_M;
546 else if( !gradx || abs(grady) > abs(gradx)<<1 )
547 p_theta[y*i_src_visible+x] = THETA_Y;
549 p_theta[y*i_src_visible+x] = THETA_X;
554 for( y = 1; y < i_num_lines - 1; y++ )
556 for( x = 1; x < i_src_visible - 1; x++ )
558 if( p_grad[y*i_src_visible+x] > 40 )
560 switch( p_theta[y*i_src_visible+x] )
563 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x]
564 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x] )
566 p_outpix[y*i_dst_pitch+x] = 0;
568 } else goto colorize;
570 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x-1]
571 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x+1] )
573 p_outpix[y*i_dst_pitch+x] = 0;
575 } else goto colorize;
577 if( p_grad[y*i_src_visible+x] > p_grad[(y-1)*i_src_visible+x+1]
578 && p_grad[y*i_src_visible+x] > p_grad[(y+1)*i_src_visible+x-1] )
580 p_outpix[y*i_dst_pitch+x] = 0;
582 } else goto colorize;
584 if( p_grad[y*i_src_visible+x] > p_grad[y*i_src_visible+x-1]
585 && p_grad[y*i_src_visible+x] > p_grad[y*i_src_visible+x+1] )
587 p_outpix[y*i_dst_pitch+x] = 0;
589 } else goto colorize;
595 if( p_filter->p_sys->b_cartoon )
597 if( p_smooth[y*i_src_visible+x] > 0xa0 )
598 p_outpix[y*i_dst_pitch+x] = (uint8_t)
599 0xff - ((0xff - p_inpix[y*i_src_pitch+x] )>>2);
600 else if( p_smooth[y*i_src_visible+x] > 0x70 )
601 p_outpix[y*i_dst_pitch+x] =(uint8_t)
602 0xa0 - ((0xa0 - p_inpix[y*i_src_pitch+x] )>>2);
603 else if( p_smooth[y*i_src_visible+x] > 0x28 )
604 p_outpix[y*i_dst_pitch+x] =(uint8_t)
605 0x70 - ((0x70 - p_inpix[y*i_src_pitch+x] )>>2);
607 p_outpix[y*i_dst_pitch+x] =(uint8_t)
608 0x28 - ((0x28 - p_inpix[y*i_src_pitch+x] )>>2);
615 /*****************************************************************************
617 *****************************************************************************/
618 #define p_pre_hough p_filter->p_sys->p_pre_hough
619 static void FilterHough( filter_t *p_filter, picture_t *p_inpic,
620 picture_t *p_outpic )
623 int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
624 int i_dst_pitch = p_outpic->p[Y_PLANE].i_pitch;
625 int i_num_lines = p_inpic->p[Y_PLANE].i_visible_lines;
627 uint8_t *p_outpix = p_outpic->p[Y_PLANE].p_pixels;
629 int i_diag = sqrt( i_num_lines * i_num_lines +
630 i_src_visible * i_src_visible);
631 int i_max, i_phi_max, i_rho, i_rho_max;
633 double d_step = M_PI / i_nb_steps;
637 int *p_hough = malloc( i_diag * i_nb_steps * sizeof(int) );
638 if( ! p_hough ) return;
639 p_smooth = (uint32_t *)malloc( i_num_lines*i_src_visible*sizeof(uint32_t));
640 if( !p_smooth ) return;
644 msg_Dbg(p_filter, "Starting precalculation");
645 p_pre_hough = malloc( i_num_lines*i_src_visible*i_nb_steps*sizeof(int));
646 if( ! p_pre_hough ) return;
647 for( i = 0 ; i < i_nb_steps ; i++)
649 d_sin = sin(d_step * i);
650 d_cos = cos(d_step * i);
651 for( y = 0 ; y < i_num_lines ; y++ )
652 for( x = 0 ; x < i_src_visible ; x++ )
654 p_pre_hough[(i*i_num_lines+y)*i_src_visible + x] =
655 ceil(x*d_sin + y*d_cos);
658 msg_Dbg(p_filter, "Precalculation done");
661 p_filter->p_libvlc->pf_memset( p_hough, 0,
662 i_diag * i_nb_steps * sizeof(int) );
664 p_filter->p_libvlc->pf_memcpy(
665 p_outpic->p[Y_PLANE].p_pixels, p_inpic->p[Y_PLANE].p_pixels,
666 p_outpic->p[Y_PLANE].i_lines * p_outpic->p[Y_PLANE].i_pitch );
667 p_filter->p_libvlc->pf_memcpy(
668 p_outpic->p[U_PLANE].p_pixels, p_inpic->p[U_PLANE].p_pixels,
669 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
670 p_filter->p_libvlc->pf_memcpy(
671 p_outpic->p[V_PLANE].p_pixels, p_inpic->p[V_PLANE].p_pixels,
672 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
674 GaussianConvolution( p_inpic, p_smooth );
679 | -2 0 2 | and | 0 0 0 |
680 | -1 0 1 | | -1 -2 -1 | */
685 for( y = 4; y < i_num_lines - 4; y++ )
687 for( x = 4; x < i_src_visible - 4; x++ )
692 ( ( p_smooth[(y-1)*i_src_visible+x]
693 - p_smooth[(y+1)*i_src_visible+x] ) <<1 )
694 + ( p_smooth[(y-1)*i_src_visible+x-1]
695 - p_smooth[(y+1)*i_src_visible+x-1] )
696 + ( p_smooth[(y-1)*i_src_visible+x+1]
697 - p_smooth[(y+1)*i_src_visible+x+1] )
701 ( ( p_smooth[y*i_src_visible+x-1]
702 - p_smooth[y*i_src_visible+x+1] ) <<1 )
703 + ( p_smooth[(y-1)*i_src_visible+x-1]
704 - p_smooth[(y-1)*i_src_visible+x+1] )
705 + ( p_smooth[(y+1)*i_src_visible+x-1]
706 - p_smooth[(y+1)*i_src_visible+x+1] )
711 for( i = 0 ; i < i_nb_steps ; i ++ )
713 i_rho = p_pre_hough[(i*i_num_lines+y)*i_src_visible + x];
714 if( p_hough[i_rho + i_diag/2 + i * i_diag]++ > i_max )
716 i_max = p_hough[i_rho + i_diag/2 + i * i_diag];
725 d_sin = sin(i_phi_max*d_step);
726 d_cos = cos(i_phi_max*d_step);
729 for( x = 0 ; x < i_src_visible ; x++ )
731 y = (i_rho_max - x * d_sin) / d_cos;
732 if( y >= 0 && y < i_num_lines )
733 p_outpix[y*i_dst_pitch+x] = 255;
737 if( p_hough ) free( p_hough );
738 if( p_smooth ) free( p_smooth );
743 static int GradientCallback( vlc_object_t *p_this, char const *psz_var,
744 vlc_value_t oldval, vlc_value_t newval,
747 filter_sys_t *p_sys = (filter_sys_t *)p_data;
748 if( !strcmp( psz_var, FILTER_PREFIX "mode" ) )
750 if( !strcmp( newval.psz_string, "gradient" ) )
752 p_sys->i_mode = GRADIENT;
754 else if( !strcmp( newval.psz_string, "edge" ) )
756 p_sys->i_mode = EDGE;
758 else if( !strcmp( newval.psz_string, "hough" ) )
760 p_sys->i_mode = HOUGH;
764 msg_Err( p_this, "no valid gradient mode provided" );
765 p_sys->i_mode = GRADIENT;
768 else if( !strcmp( psz_var, FILTER_PREFIX "type" ) )
770 p_sys->i_gradient_type = newval.i_int;
772 else if( !strcmp( psz_var, FILTER_PREFIX "cartoon" ) )
774 p_sys->b_cartoon = newval.b_bool;