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 *****************************************************************************/
43 #include "vlc_filter.h"
45 #define SIG_TEXT N_("Sharpen strength (0-2)")
46 #define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
48 /*****************************************************************************
50 *****************************************************************************/
51 static int Create ( vlc_object_t * );
52 static void Destroy ( vlc_object_t * );
54 static picture_t *Filter( filter_t *, picture_t * );
55 static int SharpenCallback( vlc_object_t *, char const *,
56 vlc_value_t, vlc_value_t, void * );
58 #define FILTER_PREFIX "sharpen-"
60 /*****************************************************************************
62 *****************************************************************************/
64 set_description( _("Augment contrast between contours.") );
65 set_shortname( _("Sharpen video filter") );
66 set_category( CAT_VIDEO );
67 set_subcategory( SUBCAT_VIDEO_VFILTER );
68 set_capability( "video filter2", 0 );
69 add_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0, NULL,
70 SIG_TEXT, SIG_LONGTEXT, VLC_FALSE );
71 add_shortcut( "sharpen" );
72 set_callbacks( Create, Destroy );
75 static const char *ppsz_filter_options[] = {
79 /*****************************************************************************
80 * filter_sys_t: Sharpen video filter descriptor
81 *****************************************************************************
82 * This structure is part of the video output thread descriptor.
83 * It describes the Sharpen specific properties of an output thread.
84 *****************************************************************************/
92 /*****************************************************************************
93 * clip: avoid negative value and value > 255
94 *****************************************************************************/
95 inline static int32_t clip( int32_t a )
97 return (a > 255) ? 255 : (a < 0) ? 0 : a;
100 static void init_precalc_table(filter_sys_t *p_filter)
102 float sigma = p_filter->f_sigma;
104 for(int i = 0; i < 512; ++i)
106 p_filter->tab_precalc[i] = (i - 256) * sigma;
110 /*****************************************************************************
111 * Create: allocates Sharpen video thread output method
112 *****************************************************************************
113 * This function allocates and initializes a Sharpen vout method.
114 *****************************************************************************/
115 static int Create( vlc_object_t *p_this )
117 filter_t *p_filter = (filter_t *)p_this;
119 /* Allocate structure */
120 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
121 if( p_filter->p_sys == NULL )
123 msg_Err( p_filter, "out of memory" );
127 p_filter->pf_video_filter = Filter;
129 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
132 p_filter->p_sys->f_sigma =
133 var_CreateGetFloatCommand( p_filter, FILTER_PREFIX "sigma" );
134 var_AddCallback( p_filter, FILTER_PREFIX "sigma",
135 SharpenCallback, p_filter->p_sys );
137 init_precalc_table(p_filter->p_sys);
143 /*****************************************************************************
144 * Destroy: destroy Sharpen video thread output method
145 *****************************************************************************
146 * Terminate an output method created by SharpenCreateOutputMethod
147 *****************************************************************************/
148 static void Destroy( vlc_object_t *p_this )
150 filter_t *p_filter = (filter_t *)p_this;
151 free( p_filter->p_sys );
154 /*****************************************************************************
155 * Render: displays previously rendered output
156 *****************************************************************************
157 * This function send the currently rendered image to Invert image, waits
158 * until it is displayed and switch the two rendering buffers, preparing next
160 *****************************************************************************/
161 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
165 uint8_t *p_src = NULL;
166 uint8_t *p_out = NULL;
170 const int v2 = 3; /* 2^3 = 8 */
172 if( !p_pic ) return NULL;
173 if( !p_filter ) return NULL;
174 if( !p_filter->p_sys ) return NULL;
176 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
179 msg_Warn( p_filter, "can't get output picture" );
180 if( p_pic->pf_release )
181 p_pic->pf_release( p_pic );
185 /* process the Y plane */
186 p_src = p_pic->p[Y_PLANE].p_pixels;
187 p_out = p_outpic->p[Y_PLANE].p_pixels;
188 if( !p_src || !p_out )
190 msg_Warn( p_filter, "can't get Y plane" );
191 if( p_pic->pf_release )
192 p_pic->pf_release( p_pic );
196 i_src_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
198 /* perform convolution only on Y plane. Avoid border line. */
199 for( i = 0; i < p_pic->p[Y_PLANE].i_visible_lines; i++ )
201 if( (i == 0) || (i == p_pic->p[Y_PLANE].i_visible_lines - 1) )
203 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
204 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] );
207 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
209 if( (j == 0) || (j == p_pic->p[Y_PLANE].i_visible_pitch - 1) )
211 p_out[i * i_src_pitch + j] = p_src[i * i_src_pitch + j];
215 pix = (p_src[(i - 1) * i_src_pitch + j - 1] * v1) +
216 (p_src[(i - 1) * i_src_pitch + j ] * v1) +
217 (p_src[(i - 1) * i_src_pitch + j + 1] * v1) +
218 (p_src[(i ) * i_src_pitch + j - 1] * v1) +
219 (p_src[(i ) * i_src_pitch + j ] << v2) +
220 (p_src[(i ) * i_src_pitch + j + 1] * v1) +
221 (p_src[(i + 1) * i_src_pitch + j - 1] * v1) +
222 (p_src[(i + 1) * i_src_pitch + j ] * v1) +
223 (p_src[(i + 1) * i_src_pitch + j + 1] * v1);
225 pix = pix >= 0 ? clip(pix) : -clip(pix * -1);
226 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] +
227 p_filter->p_sys->tab_precalc[pix + 256] );
232 p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
233 p_pic->p[U_PLANE].p_pixels,
234 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
236 p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
237 p_pic->p[V_PLANE].p_pixels,
238 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
241 p_outpic->date = p_pic->date;
242 p_outpic->b_force = p_pic->b_force;
243 p_outpic->i_nb_fields = p_pic->i_nb_fields;
244 p_outpic->b_progressive = p_pic->b_progressive;
245 p_outpic->b_top_field_first = p_pic->b_top_field_first;
247 if( p_pic->pf_release )
248 p_pic->pf_release( p_pic );
253 static int SharpenCallback( vlc_object_t *p_this, char const *psz_var,
254 vlc_value_t oldval, vlc_value_t newval,
257 filter_sys_t *p_sys = (filter_sys_t *)p_data;
258 if( !strcmp( psz_var, FILTER_PREFIX "sigma" ) )
259 p_sys->f_sigma = __MIN( 2., __MAX( 0., newval.f_float ) );
260 init_precalc_table(p_sys);