1 /*****************************************************************************
2 * sharpen.c: Sharpen video filter
3 *****************************************************************************
4 * Copyright (C) 2003-2007 the VideoLAN team
5 * $Id: sharpen.c 18062 2006-11-26 14:20:34Z zorglub $
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 *****************************************************************************/
39 #include "vlc_filter.h"
41 #define SIG_TEXT N_("Sharpen strength (0-2)")
42 #define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Create ( vlc_object_t * );
48 static void Destroy ( vlc_object_t * );
50 static picture_t *Filter( filter_t *, picture_t * );
51 static int SharpenCallback( vlc_object_t *, char const *,
52 vlc_value_t, vlc_value_t, void * );
54 #define FILTER_PREFIX "sharpen-"
56 /*****************************************************************************
58 *****************************************************************************/
60 set_description( _("Augment contrast between contours.") );
61 set_shortname( _("Sharpen video filter") );
62 set_category( CAT_VIDEO );
63 set_subcategory( SUBCAT_VIDEO_VFILTER );
64 set_capability( "video filter2", 0 );
65 add_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0, NULL,
66 SIG_TEXT, SIG_LONGTEXT, VLC_FALSE );
67 add_shortcut( "sharpen" );
68 set_callbacks( Create, Destroy );
71 static const char *ppsz_filter_options[] = {
75 /*****************************************************************************
76 * filter_sys_t: Sharpen video filter descriptor
77 *****************************************************************************
78 * This structure is part of the video output thread descriptor.
79 * It describes the Sharpen specific properties of an output thread.
80 *****************************************************************************/
88 /*****************************************************************************
89 * clip: avoid negative value and value > 255
90 *****************************************************************************/
91 inline static int32_t clip( int32_t a )
93 return (a > 255) ? 255 : (a < 0) ? 0 : a;
96 static void init_precalc_table(filter_sys_t *p_filter)
98 float sigma = p_filter->f_sigma;
100 for(int i = 0; i < 512; ++i)
102 p_filter->tab_precalc[i] = (i - 256) * sigma;
106 /*****************************************************************************
107 * Create: allocates Sharpen video thread output method
108 *****************************************************************************
109 * This function allocates and initializes a Sharpen vout method.
110 *****************************************************************************/
111 static int Create( vlc_object_t *p_this )
113 filter_t *p_filter = (filter_t *)p_this;
115 /* Allocate structure */
116 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
117 if( p_filter->p_sys == NULL )
119 msg_Err( p_filter, "out of memory" );
123 p_filter->pf_video_filter = Filter;
125 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
128 p_filter->p_sys->f_sigma =
129 var_CreateGetFloatCommand( p_filter, FILTER_PREFIX "sigma" );
130 var_AddCallback( p_filter, FILTER_PREFIX "sigma",
131 SharpenCallback, p_filter->p_sys );
133 init_precalc_table(p_filter->p_sys);
139 /*****************************************************************************
140 * Destroy: destroy Sharpen video thread output method
141 *****************************************************************************
142 * Terminate an output method created by SharpenCreateOutputMethod
143 *****************************************************************************/
144 static void Destroy( vlc_object_t *p_this )
146 filter_t *p_filter = (filter_t *)p_this;
147 free( p_filter->p_sys );
150 /*****************************************************************************
151 * Render: displays previously rendered output
152 *****************************************************************************
153 * This function send the currently rendered image to Invert image, waits
154 * until it is displayed and switch the two rendering buffers, preparing next
156 *****************************************************************************/
157 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
161 uint8_t *p_src = NULL;
162 uint8_t *p_out = NULL;
166 const int v2 = 3; /* 2^3 = 8 */
168 if( !p_pic ) return NULL;
169 if( !p_filter ) return NULL;
170 if( !p_filter->p_sys ) return NULL;
172 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
175 msg_Warn( p_filter, "can't get output picture" );
176 if( p_pic->pf_release )
177 p_pic->pf_release( p_pic );
181 /* process the Y plane */
182 p_src = p_pic->p[Y_PLANE].p_pixels;
183 p_out = p_outpic->p[Y_PLANE].p_pixels;
184 if( !p_src || !p_out )
186 msg_Warn( p_filter, "can't get Y plane" );
187 if( p_pic->pf_release )
188 p_pic->pf_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 p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
229 p_pic->p[U_PLANE].p_pixels,
230 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
232 p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
233 p_pic->p[V_PLANE].p_pixels,
234 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
237 p_outpic->date = p_pic->date;
238 p_outpic->b_force = p_pic->b_force;
239 p_outpic->i_nb_fields = p_pic->i_nb_fields;
240 p_outpic->b_progressive = p_pic->b_progressive;
241 p_outpic->b_top_field_first = p_pic->b_top_field_first;
243 if( p_pic->pf_release )
244 p_pic->pf_release( p_pic );
249 static int SharpenCallback( vlc_object_t *p_this, char const *psz_var,
250 vlc_value_t oldval, vlc_value_t newval,
253 filter_sys_t *p_sys = (filter_sys_t *)p_data;
254 if( !strcmp( psz_var, FILTER_PREFIX "sigma" ) )
255 p_sys->f_sigma = __MIN( 2., __MAX( 0., newval.f_float ) );
256 init_precalc_table(p_sys);