1 /*****************************************************************************
2 * sharpen.c: Sharpen video filter
3 *****************************************************************************
4 * Copyright (C) 2003-2007 the VideoLAN team
7 * Author: Jérémy DEMEULE <dj_mulder at djduron dot no-ip dot org>
8 * Jean-Baptiste Kempf <jb 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 /* The sharpen filter. */
27 * static int filter[] = { -1, -1, -1,
32 /*****************************************************************************
34 *****************************************************************************/
40 #include <vlc_common.h>
41 #include <vlc_plugin.h>
44 #include "vlc_filter.h"
45 #include "filter_picture.h"
47 #define SIG_TEXT N_("Sharpen strength (0-2)")
48 #define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
50 /*****************************************************************************
52 *****************************************************************************/
53 static int Create ( vlc_object_t * );
54 static void Destroy ( vlc_object_t * );
56 static picture_t *Filter( filter_t *, picture_t * );
57 static int SharpenCallback( vlc_object_t *, char const *,
58 vlc_value_t, vlc_value_t, void * );
60 #define FILTER_PREFIX "sharpen-"
62 /*****************************************************************************
64 *****************************************************************************/
66 set_description( N_("Augment contrast between contours.") );
67 set_shortname( N_("Sharpen video filter") );
68 set_category( CAT_VIDEO );
69 set_subcategory( SUBCAT_VIDEO_VFILTER );
70 set_capability( "video filter2", 0 );
71 add_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0, NULL,
72 SIG_TEXT, SIG_LONGTEXT, false );
73 add_shortcut( "sharpen" );
74 set_callbacks( Create, Destroy );
77 static const char *const ppsz_filter_options[] = {
81 /*****************************************************************************
82 * filter_sys_t: Sharpen video filter descriptor
83 *****************************************************************************
84 * This structure is part of the video output thread descriptor.
85 * It describes the Sharpen specific properties of an output thread.
86 *****************************************************************************/
94 /*****************************************************************************
95 * clip: avoid negative value and value > 255
96 *****************************************************************************/
97 inline static int32_t clip( int32_t a )
99 return (a > 255) ? 255 : (a < 0) ? 0 : a;
102 static void init_precalc_table(filter_sys_t *p_filter)
104 float sigma = p_filter->f_sigma;
106 for(int i = 0; i < 512; ++i)
108 p_filter->tab_precalc[i] = (i - 256) * sigma;
112 /*****************************************************************************
113 * Create: allocates Sharpen video thread output method
114 *****************************************************************************
115 * This function allocates and initializes a Sharpen vout method.
116 *****************************************************************************/
117 static int Create( vlc_object_t *p_this )
119 filter_t *p_filter = (filter_t *)p_this;
121 /* Allocate structure */
122 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
123 if( p_filter->p_sys == NULL )
126 p_filter->pf_video_filter = Filter;
128 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
131 p_filter->p_sys->f_sigma =
132 var_CreateGetFloatCommand( p_filter, FILTER_PREFIX "sigma" );
133 var_AddCallback( p_filter, FILTER_PREFIX "sigma",
134 SharpenCallback, p_filter->p_sys );
136 init_precalc_table(p_filter->p_sys);
142 /*****************************************************************************
143 * Destroy: destroy Sharpen video thread output method
144 *****************************************************************************
145 * Terminate an output method created by SharpenCreateOutputMethod
146 *****************************************************************************/
147 static void Destroy( vlc_object_t *p_this )
149 filter_t *p_filter = (filter_t *)p_this;
150 free( p_filter->p_sys );
153 /*****************************************************************************
154 * Render: displays previously rendered output
155 *****************************************************************************
156 * This function send the currently rendered image to Invert image, waits
157 * until it is displayed and switch the two rendering buffers, preparing next
159 *****************************************************************************/
160 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
164 uint8_t *p_src = NULL;
165 uint8_t *p_out = NULL;
169 const int v2 = 3; /* 2^3 = 8 */
171 if( !p_pic ) return NULL;
172 if( !p_filter ) return NULL;
173 if( !p_filter->p_sys ) return NULL;
175 p_outpic = filter_NewPicture( p_filter );
178 picture_Release( p_pic );
182 /* process the Y plane */
183 p_src = p_pic->p[Y_PLANE].p_pixels;
184 p_out = p_outpic->p[Y_PLANE].p_pixels;
185 if( !p_src || !p_out )
187 msg_Warn( p_filter, "can't get Y plane" );
188 picture_Release( p_pic );
192 i_src_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
194 /* perform convolution only on Y plane. Avoid border line. */
195 for( i = 0; i < p_pic->p[Y_PLANE].i_visible_lines; i++ )
197 if( (i == 0) || (i == p_pic->p[Y_PLANE].i_visible_lines - 1) )
199 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
200 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] );
203 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
205 if( (j == 0) || (j == p_pic->p[Y_PLANE].i_visible_pitch - 1) )
207 p_out[i * i_src_pitch + j] = p_src[i * i_src_pitch + j];
211 pix = (p_src[(i - 1) * i_src_pitch + j - 1] * v1) +
212 (p_src[(i - 1) * i_src_pitch + j ] * v1) +
213 (p_src[(i - 1) * i_src_pitch + j + 1] * v1) +
214 (p_src[(i ) * i_src_pitch + j - 1] * v1) +
215 (p_src[(i ) * i_src_pitch + j ] << v2) +
216 (p_src[(i ) * i_src_pitch + j + 1] * v1) +
217 (p_src[(i + 1) * i_src_pitch + j - 1] * v1) +
218 (p_src[(i + 1) * i_src_pitch + j ] * v1) +
219 (p_src[(i + 1) * i_src_pitch + j + 1] * v1);
221 pix = pix >= 0 ? clip(pix) : -clip(pix * -1);
222 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] +
223 p_filter->p_sys->tab_precalc[pix + 256] );
228 vlc_memcpy( p_outpic->p[U_PLANE].p_pixels, p_pic->p[U_PLANE].p_pixels,
229 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
231 vlc_memcpy( p_outpic->p[V_PLANE].p_pixels, p_pic->p[V_PLANE].p_pixels,
232 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
235 return CopyInfoAndRelease( p_outpic, p_pic );
238 static int SharpenCallback( vlc_object_t *p_this, char const *psz_var,
239 vlc_value_t oldval, vlc_value_t newval,
242 VLC_UNUSED(p_this); VLC_UNUSED(oldval);
243 filter_sys_t *p_sys = (filter_sys_t *)p_data;
244 if( !strcmp( psz_var, FILTER_PREFIX "sigma" ) )
245 p_sys->f_sigma = __MIN( 2., __MAX( 0., newval.f_float ) );
246 init_precalc_table(p_sys);