1 /*****************************************************************************
2 * sharpen.c: Sharpen video filter
3 *****************************************************************************
4 * Copyright (C) 2003-2007 VLC authors and VideoLAN
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 it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * 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>
43 #include <vlc_filter.h>
44 #include "filter_picture.h"
46 #define SIG_TEXT N_("Sharpen strength (0-2)")
47 #define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
49 /*****************************************************************************
51 *****************************************************************************/
52 static int Create ( vlc_object_t
* );
53 static void Destroy ( vlc_object_t
* );
55 static picture_t
*Filter( filter_t
*, picture_t
* );
56 static int SharpenCallback( vlc_object_t
*, char const *,
57 vlc_value_t
, vlc_value_t
, void * );
59 #define SHARPEN_HELP N_("Augment contrast between contours.")
60 #define FILTER_PREFIX "sharpen-"
62 /*****************************************************************************
64 *****************************************************************************/
66 set_description( N_("Sharpen video filter") )
67 set_shortname( N_("Sharpen") )
68 set_help(SHARPEN_HELP
)
69 set_category( CAT_VIDEO
)
70 set_subcategory( SUBCAT_VIDEO_VFILTER
)
71 set_capability( "video filter2", 0 )
72 add_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0,
73 SIG_TEXT
, SIG_LONGTEXT
, false )
74 add_shortcut( "sharpen" )
75 set_callbacks( Create
, Destroy
)
78 static const char *const ppsz_filter_options
[] = {
82 /*****************************************************************************
83 * filter_sys_t: Sharpen video filter descriptor
84 *****************************************************************************
85 * This structure is part of the video output thread descriptor.
86 * It describes the Sharpen specific properties of an output thread.
87 *****************************************************************************/
95 /*****************************************************************************
96 * clip: avoid negative value and value > 255
97 *****************************************************************************/
98 inline static int32_t clip( int32_t a
)
100 return (a
> 255) ? 255 : (a
< 0) ? 0 : a
;
103 static void init_precalc_table(filter_sys_t
*p_filter
, float sigma
)
105 for(int i
= 0; i
< 512; ++i
)
107 p_filter
->tab_precalc
[i
] = (i
- 256) * sigma
;
111 /*****************************************************************************
112 * Create: allocates Sharpen video thread output method
113 *****************************************************************************
114 * This function allocates and initializes a Sharpen vout method.
115 *****************************************************************************/
116 static int Create( vlc_object_t
*p_this
)
118 filter_t
*p_filter
= (filter_t
*)p_this
;
120 const vlc_fourcc_t fourcc
= p_filter
->fmt_in
.video
.i_chroma
;
121 const vlc_chroma_description_t
*p_chroma
= vlc_fourcc_GetChromaDescription( fourcc
);
122 if( !p_chroma
|| p_chroma
->plane_count
!= 3 || p_chroma
->pixel_size
!= 1 ) {
123 msg_Err( p_filter
, "Unsupported chroma (%4.4s)", (char*)&fourcc
);
127 /* Allocate structure */
128 p_filter
->p_sys
= malloc( sizeof( filter_sys_t
) );
129 if( p_filter
->p_sys
== NULL
)
132 p_filter
->pf_video_filter
= Filter
;
134 config_ChainParse( p_filter
, FILTER_PREFIX
, ppsz_filter_options
,
137 float sigma
= var_CreateGetFloatCommand( p_filter
, FILTER_PREFIX
"sigma" );
138 init_precalc_table(p_filter
->p_sys
, sigma
);
140 vlc_mutex_init( &p_filter
->p_sys
->lock
);
141 var_AddCallback( p_filter
, FILTER_PREFIX
"sigma",
142 SharpenCallback
, p_filter
->p_sys
);
148 /*****************************************************************************
149 * Destroy: destroy Sharpen video thread output method
150 *****************************************************************************
151 * Terminate an output method created by SharpenCreateOutputMethod
152 *****************************************************************************/
153 static void Destroy( vlc_object_t
*p_this
)
155 filter_t
*p_filter
= (filter_t
*)p_this
;
156 filter_sys_t
*p_sys
= p_filter
->p_sys
;
158 var_DelCallback( p_filter
, FILTER_PREFIX
"sigma", SharpenCallback
, p_sys
);
159 vlc_mutex_destroy( &p_sys
->lock
);
163 /*****************************************************************************
164 * Render: displays previously rendered output
165 *****************************************************************************
166 * This function send the currently rendered image to Invert image, waits
167 * until it is displayed and switch the two rendering buffers, preparing next
169 *****************************************************************************/
170 static picture_t
*Filter( filter_t
*p_filter
, picture_t
*p_pic
)
174 uint8_t *p_src
= NULL
;
175 uint8_t *p_out
= NULL
;
180 const int v2
= 3; /* 2^3 = 8 */
182 if( !p_pic
) return NULL
;
184 p_outpic
= filter_NewPicture( p_filter
);
187 picture_Release( p_pic
);
191 /* process the Y plane */
192 p_src
= p_pic
->p
[Y_PLANE
].p_pixels
;
193 p_out
= p_outpic
->p
[Y_PLANE
].p_pixels
;
194 i_src_pitch
= p_pic
->p
[Y_PLANE
].i_pitch
;
195 i_out_pitch
= p_outpic
->p
[Y_PLANE
].i_pitch
;
197 /* perform convolution only on Y plane. Avoid border line. */
198 vlc_mutex_lock( &p_filter
->p_sys
->lock
);
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_out_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_out_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_out_pitch
+ j
] = clip( p_src
[i
* i_src_pitch
+ j
] +
227 p_filter
->p_sys
->tab_precalc
[pix
+ 256] );
230 vlc_mutex_unlock( &p_filter
->p_sys
->lock
);
232 plane_CopyPixels( &p_outpic
->p
[U_PLANE
], &p_pic
->p
[U_PLANE
] );
233 plane_CopyPixels( &p_outpic
->p
[V_PLANE
], &p_pic
->p
[V_PLANE
] );
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
); VLC_UNUSED(psz_var
);
243 filter_sys_t
*p_sys
= (filter_sys_t
*)p_data
;
245 vlc_mutex_lock( &p_sys
->lock
);
246 init_precalc_table( p_sys
, VLC_CLIP( newval
.f_float
, 0.f
, 2.f
) );
247 vlc_mutex_unlock( &p_sys
->lock
);