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>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /* The sharpen filter. */
26 * static int filter[] = { -1, -1, -1,
31 /*****************************************************************************
33 *****************************************************************************/
34 #include <stdlib.h> /* malloc(), free() */
40 #include "vlc_filter.h"
42 #define SIG_TEXT N_("Sharpen strength (0-2)")
43 #define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
45 /*****************************************************************************
47 *****************************************************************************/
48 static int Create ( vlc_object_t * );
49 static void Destroy ( vlc_object_t * );
51 static picture_t *Filter( filter_t *, picture_t * );
53 /*****************************************************************************
55 *****************************************************************************/
57 set_description( _("Augment contrast between contours.") );
58 set_shortname( _("Sharpen video filter") );
59 set_category( CAT_VIDEO );
60 set_subcategory( SUBCAT_VIDEO_VFILTER );
61 set_capability( "video filter2", 0 );
62 add_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0, NULL,
63 SIG_TEXT, SIG_LONGTEXT, VLC_FALSE );
64 add_shortcut( "sharpen" );
65 set_callbacks( Create, Destroy );
68 /*****************************************************************************
69 * filter_sys_t: Sharpen video filter descriptor
70 *****************************************************************************
71 * This structure is part of the video output thread descriptor.
72 * It describes the Sharpen specific properties of an output thread.
73 *****************************************************************************/
80 /*****************************************************************************
81 * clip: avoid negative value and value > 255
82 *****************************************************************************/
83 inline static int32_t clip( int32_t a )
85 return (a > 255) ? 255 : (a < 0) ? 0 : a;
88 /*****************************************************************************
89 * Create: allocates Sharpen video thread output method
90 *****************************************************************************
91 * This function allocates and initializes a Sharpen vout method.
92 *****************************************************************************/
93 static int Create( vlc_object_t *p_this )
95 filter_t *p_filter = (filter_t *)p_this;
97 /* Allocate structure */
98 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
99 if( p_filter->p_sys == NULL )
101 msg_Err( p_filter, "out of memory" );
105 p_filter->pf_video_filter = Filter;
107 p_filter->p_sys->f_sigma = var_GetFloat(p_this, "sharpen-sigma");
113 /*****************************************************************************
114 * Destroy: destroy Sharpen video thread output method
115 *****************************************************************************
116 * Terminate an output method created by SharpenCreateOutputMethod
117 *****************************************************************************/
118 static void Destroy( vlc_object_t *p_this )
120 filter_t *p_filter = (filter_t *)p_this;
121 free( p_filter->p_sys );
124 /*****************************************************************************
125 * Render: displays previously rendered output
126 *****************************************************************************
127 * This function send the currently rendered image to Invert image, waits
128 * until it is displayed and switch the two rendering buffers, preparing next
130 *****************************************************************************/
131 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
136 uint8_t *p_src = NULL;
137 uint8_t *p_out = NULL;
141 const int v2 = 3; /* 2^3 = 8 */
143 if( !p_pic ) return NULL;
144 if( !p_filter ) return NULL;
145 if( !p_filter->p_sys ) return NULL;
147 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
150 msg_Warn( p_filter, "can't get output picture" );
151 if( p_pic->pf_release )
152 p_pic->pf_release( p_pic );
156 /* process the Y plane */
157 p_src = p_pic->p[Y_PLANE].p_pixels;
158 p_out = p_outpic->p[Y_PLANE].p_pixels;
159 if( !p_src || !p_out )
161 msg_Warn( p_filter, "can't get Y plane" );
162 if( p_pic->pf_release )
163 p_pic->pf_release( p_pic );
167 i_src_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
169 /* perform convolution only on Y plane. Avoid border line. */
170 for( i = 0; i < p_pic->p[Y_PLANE].i_visible_lines; i++ )
172 if( (i == 0) || (i == p_pic->p[Y_PLANE].i_visible_lines - 1) )
174 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
175 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] );
178 for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
180 if( (j == 0) || (j == p_pic->p[Y_PLANE].i_visible_pitch - 1) )
182 p_out[i * i_src_pitch + j] = p_src[i * i_src_pitch + j];
186 pix = (p_src[(i - 1) * i_src_pitch + j - 1] * v1) +
187 (p_src[(i - 1) * i_src_pitch + j ] * v1) +
188 (p_src[(i - 1) * i_src_pitch + j + 1] * v1) +
189 (p_src[(i ) * i_src_pitch + j - 1] * v1) +
190 (p_src[(i ) * i_src_pitch + j ] << v2) +
191 (p_src[(i ) * i_src_pitch + j + 1] * v1) +
192 (p_src[(i + 1) * i_src_pitch + j - 1] * v1) +
193 (p_src[(i + 1) * i_src_pitch + j ] * v1) +
194 (p_src[(i + 1) * i_src_pitch + j + 1] * v1);
196 p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] +
197 (p_filter->p_sys->f_sigma * pix) );
202 p_filter->p_libvlc->pf_memcpy( p_outpic->p[U_PLANE].p_pixels,
203 p_pic->p[U_PLANE].p_pixels,
204 p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
206 p_filter->p_libvlc->pf_memcpy( p_outpic->p[V_PLANE].p_pixels,
207 p_pic->p[V_PLANE].p_pixels,
208 p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
211 p_outpic->date = p_pic->date;
212 p_outpic->b_force = p_pic->b_force;
213 p_outpic->i_nb_fields = p_pic->i_nb_fields;
214 p_outpic->b_progressive = p_pic->b_progressive;
215 p_outpic->b_top_field_first = p_pic->b_top_field_first;
217 if( p_pic->pf_release )
218 p_pic->pf_release( p_pic );