1 /*****************************************************************************
2 * gaussianblur.c : gaussian blur video filter
3 *****************************************************************************
4 * Copyright (C) 2000-2007 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 #include <math.h> /* exp(), sqrt() */
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 * );
49 #define SIGMA_TEXT N_("Gaussian's std deviation")
50 #define SIGMA_LONGTEXT N_( \
51 "Gaussian's standard deviation. The bluring will take " \
52 "into account pixels up to 3*sigma away in any direction.")
54 #define FILTER_PREFIX "gaussianblur-"
56 /*****************************************************************************
58 *****************************************************************************/
60 set_description( N_("Gaussian blur video filter") );
61 set_shortname( N_( "Gaussian Blur" ));
62 set_capability( "video filter2", 0 );
63 set_category( CAT_VIDEO );
64 set_subcategory( SUBCAT_VIDEO_VFILTER );
66 add_float( FILTER_PREFIX "sigma", 2., NULL, SIGMA_TEXT, SIGMA_LONGTEXT,
69 set_callbacks( Create, Destroy );
72 static const char *const ppsz_filter_options[] = {
76 /* Comment this to use floats instead of integers (faster for bigger sigma
78 * For sigma = 2 ints are faster
79 * For sigma = 4 floats are faster
81 #define DONT_USE_FLOATS
86 #ifdef DONT_USE_FLOATS
91 float *pf_distribution;
97 static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
99 double f_sigma = p_sys->f_sigma;
100 int i_dim = (int)(3.*f_sigma);
101 #ifdef DONT_USE_FLOATS
102 int *pi_distribution = (int*)malloc( (2*i_dim+1) * sizeof( int ) );
104 float *pf_distribution = (float*)malloc( (2*i_dim+1) * sizeof( float ) );
107 for( x = -i_dim; x <= i_dim; x++ )
109 #ifdef DONT_USE_FLOATS
110 pi_distribution[i_dim+x] =
111 (int)( sqrt( exp(-(x*x)/(f_sigma*f_sigma) )
112 / (2.*M_PI*f_sigma*f_sigma) ) * (double)(1<<8) );
113 printf("%d\n",pi_distribution[i_dim+x]);
115 pf_distribution[i_dim+x] = (float)
116 sqrt( exp(-(x*x)/(f_sigma*f_sigma) ) / (2.*M_PI*f_sigma*f_sigma) );
117 printf("%f\n",pf_distribution[i_dim+x]);
120 p_sys->i_dim = i_dim;
121 #ifdef DONT_USE_FLOATS
122 p_sys->pi_distribution = pi_distribution;
124 p_sys->pf_distribution = pf_distribution;
128 static int Create( vlc_object_t *p_this )
130 filter_t *p_filter = (filter_t *)p_this;
132 if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
133 && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
134 && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
135 && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
137 && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
138 && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
141 /* We only want planar YUV 4:2:0 or 4:2:2 */
142 msg_Err( p_filter, "Unsupported input chroma (%4s)",
143 (char*)&(p_filter->fmt_in.video.i_chroma) );
147 if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
149 msg_Err( p_filter, "Input and output chromas don't match" );
153 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
154 if( p_filter->p_sys == NULL )
157 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
160 p_filter->pf_video_filter = Filter;
162 p_filter->p_sys->f_sigma =
163 var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
164 if( p_filter->p_sys->f_sigma <= 0. )
166 msg_Err( p_filter, "sigma must be positive" );
169 gaussianblur_InitDistribution( p_filter->p_sys );
170 msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
171 p_filter->p_sys->i_dim*2+1 );
172 #ifdef DONT_USE_FLOATS
173 p_filter->p_sys->pi_buffer = NULL;
174 p_filter->p_sys->pi_scale = NULL;
176 p_filter->p_sys->pf_buffer = NULL;
177 p_filter->p_sys->pf_scale = NULL;
183 static void Destroy( vlc_object_t *p_this )
185 filter_t *p_filter = (filter_t *)p_this;
186 #ifdef DONT_USE_FLOATS
187 free( p_filter->p_sys->pi_distribution );
188 free( p_filter->p_sys->pi_buffer );
189 free( p_filter->p_sys->pi_scale );
191 free( p_filter->p_sys->pf_distribution );
192 free( p_filter->p_sys->pf_buffer );
193 free( p_filter->p_sys->pf_scale );
195 free( p_filter->p_sys );
198 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
201 filter_sys_t *p_sys = p_filter->p_sys;
203 const int i_dim = p_sys->i_dim;
204 #ifdef DONT_USE_FLOATS
207 const int *pi_distribution = p_sys->pi_distribution;
211 const float *pf_distribution = p_sys->pf_distribution;
213 if( !p_pic ) return NULL;
215 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
218 msg_Warn( p_filter, "can't get output picture" );
219 picture_Release( p_pic );
222 #ifdef DONT_USE_FLOATS
223 if( !p_sys->pi_buffer )
225 p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
226 p_pic->p[Y_PLANE].i_visible_lines
227 * p_pic->p[Y_PLANE].i_pitch
230 pi_buffer = p_sys->pi_buffer;
232 if( !p_sys->pf_buffer )
234 p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
235 p_pic->p[Y_PLANE].i_visible_lines
236 * p_pic->p[Y_PLANE].i_pitch
239 pf_buffer = p_sys->pf_buffer;
241 #ifdef DONT_USE_FLOATS
242 if( !p_sys->pi_scale )
244 if( !p_sys->pf_scale )
247 const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
248 const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
249 const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
251 #ifdef DONT_USE_FLOATS
252 p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
254 pi_scale = p_sys->pi_scale;
256 p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
258 pf_scale = p_sys->pf_scale;
260 for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
262 for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
265 #ifdef DONT_USE_FLOATS
270 for( y = __MAX( -i_dim, -i_line );
271 y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
274 for( x = __MAX( -i_dim, -i_col );
275 x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
278 #ifdef DONT_USE_FLOATS
279 value += pi_distribution[y+i_dim]
280 * pi_distribution[x+i_dim];
282 value += ((double)pf_distribution[y+i_dim])
283 * ((double)pf_distribution[x+i_dim]);
287 #ifdef DONT_USE_FLOATS
288 pi_scale[i_line*i_pitch+i_col] = value;
290 pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
295 #ifdef DONT_USE_FLOATS
296 pi_scale = p_sys->pi_scale;
298 pf_scale = p_sys->pf_scale;
301 for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
304 uint8_t *p_in = p_pic->p[i_plane].p_pixels;
305 uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
307 const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
308 const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
309 const int i_pitch = p_pic->p[i_plane].i_pitch;
312 const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
313 const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
315 for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
317 for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
319 #ifdef DONT_USE_FLOATS
325 const int c = i_line*i_pitch+i_col;
326 for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
327 x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
330 #ifdef DONT_USE_FLOATS
331 value += pi_distribution[x+i_dim]
332 * p_in[c+(x>>x_factor)];
334 value += pf_distribution[x+i_dim]
335 * (float)p_in[c+(x>>x_factor)];
338 #ifdef DONT_USE_FLOATS
339 pi_buffer[c] = value;
341 pf_buffer[c] = value;
345 for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
347 for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
349 #ifdef DONT_USE_FLOATS
355 const int c = i_line*i_pitch+i_col;
356 for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
357 y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
360 #ifdef DONT_USE_FLOATS
361 value += pi_distribution[y+i_dim]
362 * pi_buffer[c+(y>>y_factor)*i_pitch];
364 value += pf_distribution[y+i_dim]
365 * pf_buffer[c+(y>>y_factor)*i_pitch];
368 #ifdef DONT_USE_FLOATS
369 p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
371 p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
377 return CopyInfoAndRelease( p_outpic, p_pic );