1 /*****************************************************************************
2 * sharpen.c: Sharpen video filter
3 *****************************************************************************
4 * Copyright (C) 2003 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 *****************************************************************************/
35 #include <stdlib.h> /* malloc(), free() */
41 #include "vlc_filter.h"
43 #define SIG_TEXT N_("Sharpen strength (0-2)")
44 #define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
46 /*****************************************************************************
48 *****************************************************************************/
49 static int Create ( vlc_object_t * );
50 static void Destroy ( vlc_object_t * );
52 static picture_t *Filter( filter_t *, picture_t * );
53 static int SharpenCallback( vlc_object_t *, char const *,
54 vlc_value_t, vlc_value_t, void * );
56 #define FILTER_PREFIX "sharpen-"
58 /*****************************************************************************
60 *****************************************************************************/
62 set_description( _("Augment contrast between contours.") );
63 set_shortname( _("Sharpen video filter") );
64 set_category( CAT_VIDEO );
65 set_subcategory( SUBCAT_VIDEO_VFILTER );
66 set_capability( "video filter2", 0 );
67 add_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0, NULL,
68 SIG_TEXT, SIG_LONGTEXT, VLC_FALSE );
69 add_shortcut( "sharpen" );
70 set_callbacks( Create, Destroy );
73 static const char *ppsz_filter_options[] = {
77 /*****************************************************************************
78 * filter_sys_t: Sharpen video filter descriptor
79 *****************************************************************************
80 * This structure is part of the video output thread descriptor.
81 * It describes the Sharpen specific properties of an output thread.
82 *****************************************************************************/
90 /*****************************************************************************
91 * clip: avoid negative value and value > 255
92 *****************************************************************************/
93 inline static int32_t clip( int32_t a )
95 return (a > 255) ? 255 : (a < 0) ? 0 : a;
98 static void init_precalc_table(filter_sys_t *p_filter)
100 float sigma = p_filter->f_sigma;
102 for(int i = 0; i < 512; ++i)
104 p_filter->tab_precalc[i] = (i - 256) * sigma;
108 /*****************************************************************************
109 * Create: allocates Sharpen video thread output method
110 *****************************************************************************
111 * This function allocates and initializes a Sharpen vout method.
112 *****************************************************************************/
113 static int Create( vlc_object_t *p_this )
115 filter_t *p_filter = (filter_t *)p_this;
117 /* Allocate structure */
118 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
119 if( p_filter->p_sys == NULL )
121 msg_Err( p_filter, "out of memory" );
125 p_filter->pf_video_filter = Filter;
127 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
130 p_filter->p_sys->f_sigma =
131 var_CreateGetFloatCommand( p_filter, FILTER_PREFIX "sigma" );
132 var_AddCallback( p_filter, FILTER_PREFIX "sigma",
133 SharpenCallback, p_filter->p_sys );
135 init_precalc_table(p_filter->p_sys);
141 /*****************************************************************************
142 * Destroy: destroy Sharpen video thread output method
143 *****************************************************************************
144 * Terminate an output method created by SharpenCreateOutputMethod
145 *****************************************************************************/
146 static void Destroy( vlc_object_t *p_this )
148 filter_t *p_filter = (filter_t *)p_this;
149 free( p_filter->p_sys );
152 /*****************************************************************************
153 * Render: displays previously rendered output
154 *****************************************************************************
155 * This function send the currently rendered image to Invert image, waits
156 * until it is displayed and switch the two rendering buffers, preparing next
158 *****************************************************************************/
159 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
163 uint8_t *p_src = NULL;
164 uint8_t *p_out = NULL;
168 const int v2 = 3; /* 2^3 = 8 */
170 if( !p_pic ) return NULL;
171 if( !p_filter ) return NULL;
172 if( !p_filter->p_sys ) return NULL;
174 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
177 msg_Warn( p_filter, "can't get output picture" );
178 if( p_pic->pf_release )
179 p_pic->pf_release( p_pic );
183 /* process the Y plane */
184 p_src = p_pic->p[Y_PLANE].p_pixels;
185 p_out = p_outpic->p[Y_PLANE].p_pixels;
186 if( !p_src || !p_out )
188 msg_Warn( p_filter, "can't get Y plane" );
189 if( p_pic->pf_release )
190 p_pic->pf_release( p_pic );
194 i_src_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
196 /* perform convolution only on Y plane. Avoid border line. */
197 for( i = 0; i < p_pic->p[Y_PLANE].i_visible_lines; i++ )
199 if( (i == 0) || (i == p_pic->p[Y_PLANE].i_visible_lines - 1) )
201 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
202 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] );
205 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
207 if( (j == 0) || (j == p_pic->p[Y_PLANE].i_visible_pitch - 1) )
209 p_out[i * i_src_pitch + j] = p_src[i * i_src_pitch + j];
213 pix = (p_src[(i - 1) * i_src_pitch + j - 1] * v1) +
214 (p_src[(i - 1) * i_src_pitch + j ] * v1) +
215 (p_src[(i - 1) * i_src_pitch + j + 1] * v1) +
216 (p_src[(i ) * i_src_pitch + j - 1] * v1) +
217 (p_src[(i ) * i_src_pitch + j ] << v2) +
218 (p_src[(i ) * i_src_pitch + j + 1] * v1) +
219 (p_src[(i + 1) * i_src_pitch + j - 1] * v1) +
220 (p_src[(i + 1) * i_src_pitch + j ] * v1) +
221 (p_src[(i + 1) * i_src_pitch + j + 1] * v1);
223 pix = pix >= 0 ? clip(pix) : -clip(pix * -1);
224 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] +
225 p_filter->p_sys->tab_precalc[pix + 256] );
230 p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
231 p_pic->p[U_PLANE].p_pixels,
232 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
234 p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
235 p_pic->p[V_PLANE].p_pixels,
236 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
239 p_outpic->date = p_pic->date;
240 p_outpic->b_force = p_pic->b_force;
241 p_outpic->i_nb_fields = p_pic->i_nb_fields;
242 p_outpic->b_progressive = p_pic->b_progressive;
243 p_outpic->b_top_field_first = p_pic->b_top_field_first;
245 if( p_pic->pf_release )
246 p_pic->pf_release( p_pic );
251 static int SharpenCallback( vlc_object_t *p_this, char const *psz_var,
252 vlc_value_t oldval, vlc_value_t newval,
255 filter_sys_t *p_sys = (filter_sys_t *)p_data;
256 if( !strcmp( psz_var, FILTER_PREFIX "sigma" ) )
257 p_sys->f_sigma = __MIN( 2., __MAX( 0., newval.f_float ) );
258 init_precalc_table(p_sys);