--- /dev/null
+/*****************************************************************************
+ * gaussianblur.c : gaussian blur video filter
+ *****************************************************************************
+ * Copyright (C) 2000-2007 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h> /* malloc(), free() */
+#include <string.h>
+
+#include <vlc/vlc.h>
+#include <vlc_vout.h>
+
+#include "vlc_filter.h"
+
+#include <math.h> /* exp() */
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int Create ( vlc_object_t * );
+static void Destroy ( vlc_object_t * );
+
+static picture_t *Filter( filter_t *, picture_t * );
+
+#define SIGMA_TEXT N_("Gaussian's std deviation")
+#define SIGMA_LONGTEXT N_( \
+ "Gaussian's standard deviation. The bluring will take " \
+ "into account pixels up to 3*sigma away in any direction.")
+
+#define FILTER_PREFIX "gaussianblur-"
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+ set_description( _("Gaussian blur video filter") );
+ set_shortname( _( "Gaussian Blur" ));
+ set_capability( "video filter2", 0 );
+ set_category( CAT_VIDEO );
+ set_subcategory( SUBCAT_VIDEO_VFILTER );
+
+ add_float( FILTER_PREFIX "sigma", 2., NULL, SIGMA_TEXT, SIGMA_LONGTEXT,
+ VLC_FALSE );
+
+ set_callbacks( Create, Destroy );
+vlc_module_end();
+
+static const char *ppsz_filter_options[] = {
+ "sigma", NULL
+};
+
+struct filter_sys_t
+{
+ double f_sigma;
+ int *pi_distribution;
+ int i_dim;
+};
+
+static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
+{
+ double f_sigma = p_sys->f_sigma;
+ int i_dim = (int)(3.*f_sigma);
+ int *pi_distribution = (int*)malloc( (2*i_dim+1) * (2*i_dim+1) * sizeof( int ) );
+ int x, y;
+ for( x = -i_dim; x <= i_dim; x++ )
+ for( y = -i_dim; y <= i_dim; y++ )
+ pi_distribution[(i_dim+y)*(2*i_dim+1)+(i_dim+x)] =
+ (int)( exp(-(x*x+y*y)/(2.*f_sigma*f_sigma))
+ / (2.*M_PI*f_sigma*f_sigma) * (double)(1<<16) );
+ p_sys->i_dim = i_dim;
+ p_sys->pi_distribution = pi_distribution;
+}
+
+static int Create( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+
+ p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
+ if( p_filter->p_sys == NULL )
+ {
+ msg_Err( p_filter, "out of memory" );
+ return VLC_ENOMEM;
+ }
+
+ config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
+ p_filter->p_cfg );
+
+ p_filter->pf_video_filter = Filter;
+
+ p_filter->p_sys->f_sigma =
+ var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
+ if( p_filter->p_sys->f_sigma <= 0. )
+ {
+ msg_Err( p_filter, "sigma must be positive" );
+ return VLC_EGENERIC;
+ }
+ gaussianblur_InitDistribution( p_filter->p_sys );
+ msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
+ p_filter->p_sys->i_dim*2+1 );
+
+ return VLC_SUCCESS;
+}
+
+static void Destroy( vlc_object_t *p_this )
+{
+ filter_t *p_filter = (filter_t *)p_this;
+ free( p_filter->p_sys->pi_distribution );
+ free( p_filter->p_sys );
+}
+
+static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
+{
+ picture_t *p_outpic;
+ filter_sys_t *p_sys = p_filter->p_sys;
+ int i_plane;
+
+ if( !p_pic ) return NULL;
+
+ p_outpic = p_filter->pf_vout_buffer_new( p_filter );
+ if( !p_outpic )
+ {
+ msg_Warn( p_filter, "can't get output picture" );
+ if( p_pic->pf_release )
+ p_pic->pf_release( p_pic );
+ return NULL;
+ }
+
+ for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
+ {
+
+ uint8_t *p_in = p_pic->p[i_plane].p_pixels;
+ uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
+
+ const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
+ const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
+ const int i_pitch = p_pic->p[i_plane].i_pitch;
+
+ const int i_dim = p_sys->i_dim;
+ const int i_dim2 = 2*i_dim+1;
+ const int *pi_distribution = p_sys->pi_distribution;
+
+ int i_line, i_col;
+ const int factor = i_plane ? 1 : 0;
+
+ for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
+ {
+ uint8_t *p_o = &p_out[i_line*i_pitch];
+ for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
+ {
+ int value = 0;
+ int scale = 0;
+ int x, y;
+ for( y = __MAX( -i_dim, -i_line );
+ y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
+ y++ )
+ {
+ const int *pi_d = &pi_distribution[(y+i_dim)*i_dim2+i_dim];
+ const uint8_t *p_i = &p_in[(i_line+(y>>factor))*i_pitch+(i_col)];
+ for( x = __MAX( -i_dim, -i_col );
+ x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
+ x++ )
+ {
+ const int weight = pi_d[x];
+ value += weight * p_i[x>>factor];
+ scale += weight;
+ }
+ }
+ p_o[i_col] = value / scale;
+ }
+ }
+ }
+
+ p_outpic->date = p_pic->date;
+ p_outpic->b_force = p_pic->b_force;
+ p_outpic->i_nb_fields = p_pic->i_nb_fields;
+ p_outpic->b_progressive = p_pic->b_progressive;
+ p_outpic->b_top_field_first = p_pic->b_top_field_first;
+
+ if( p_pic->pf_release )
+ p_pic->pf_release( p_pic );
+
+ return p_outpic;
+}
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