1 /*****************************************************************************
2 * bluescreen.c : Bluescreen (weather channel like) video filter for vlc
3 *****************************************************************************
4 * Copyright (C) 2005-2007 the VideoLAN team
7 * Authors: Antoine Cellerier <dionoea at videolan tod 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 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
36 #include "vlc_filter.h"
38 #define BLUESCREEN_HELP N_( \
39 "This effect, also known as \"greenscreen\" or \"chroma key\" blends " \
40 "the \"blue parts\" of the foreground image of the mosaic on the " \
41 "background (like weather forecasts). You can choose the \"key\" " \
42 "color for blending (blue by default)." )
44 #define BLUESCREENU_TEXT N_("Bluescreen U value")
45 #define BLUESCREENU_LONGTEXT N_( \
46 "\"U\" value for the bluescreen key color " \
47 "(in YUV values). From 0 to 255. Defaults to 120 for blue." )
48 #define BLUESCREENV_TEXT N_("Bluescreen V value")
49 #define BLUESCREENV_LONGTEXT N_( \
50 "\"V\" value for the bluescreen key color " \
51 "(in YUV values). From 0 to 255. Defaults to 90 for blue." )
52 #define BLUESCREENUTOL_TEXT N_("Bluescreen U tolerance")
53 #define BLUESCREENUTOL_LONGTEXT N_( \
54 "Tolerance of the bluescreen blender " \
55 "on color variations for the U plane. A value between 10 and 20 " \
57 #define BLUESCREENVTOL_TEXT N_("Bluescreen V tolerance")
58 #define BLUESCREENVTOL_LONGTEXT N_( \
59 "Tolerance of the bluescreen blender " \
60 "on color variations for the V plane. A value between 10 and 20 " \
63 #define CFG_PREFIX "bluescreen-"
65 /*****************************************************************************
67 *****************************************************************************/
68 static int Create ( vlc_object_t * );
69 static void Destroy ( vlc_object_t * );
71 static picture_t *Filter( filter_t *, picture_t * );
72 static int BluescreenCallback( vlc_object_t *, char const *,
73 vlc_value_t, vlc_value_t, void * );
75 /*****************************************************************************
77 *****************************************************************************/
79 set_description( N_("Bluescreen video filter") )
80 set_shortname( N_("Bluescreen" ))
81 set_help( BLUESCREEN_HELP )
82 set_category( CAT_VIDEO )
83 set_subcategory( SUBCAT_VIDEO_VFILTER )
84 set_capability( "video filter2", 0 )
85 add_shortcut( "bluescreen" )
86 set_callbacks( Create, Destroy )
88 add_integer_with_range( CFG_PREFIX "u", 120, 0, 255, NULL,
89 BLUESCREENU_TEXT, BLUESCREENU_LONGTEXT, false )
90 add_integer_with_range( CFG_PREFIX "v", 90, 0, 255, NULL,
91 BLUESCREENV_TEXT, BLUESCREENV_LONGTEXT, false )
92 add_integer_with_range( CFG_PREFIX "ut", 17, 0, 255, NULL,
93 BLUESCREENUTOL_TEXT, BLUESCREENUTOL_LONGTEXT,
95 add_integer_with_range( CFG_PREFIX "vt", 17, 0, 255, NULL,
96 BLUESCREENVTOL_TEXT, BLUESCREENVTOL_LONGTEXT,
100 static const char *const ppsz_filter_options[] = {
101 "u", "v", "ut", "vt", NULL
107 int i_u, i_v, i_ut, i_vt;
111 static int Create( vlc_object_t *p_this )
113 filter_t *p_filter = (filter_t *)p_this;
116 if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') )
119 "Unsupported input chroma \"%4s\". "
120 "Bluescreen can only use \"YUVA\".",
121 (char*)&p_filter->fmt_in.video.i_chroma );
125 /* Allocate structure */
126 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
127 if( p_filter->p_sys == NULL )
129 p_sys = p_filter->p_sys;
131 config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
135 vlc_mutex_init( &p_sys->lock );
136 #define GET_VAR( name, min, max ) \
137 val = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX #name ); \
138 p_sys->i_##name = __MIN( max, __MAX( min, val ) ); \
139 var_AddCallback( p_filter, CFG_PREFIX #name, BluescreenCallback, p_sys );
141 GET_VAR( u, 0x00, 0xff );
142 GET_VAR( v, 0x00, 0xff );
143 GET_VAR( ut, 0x00, 0xff );
144 GET_VAR( vt, 0x00, 0xff );
148 p_filter->pf_video_filter = Filter;
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, CFG_PREFIX "u", BluescreenCallback, p_sys );
159 var_DelCallback( p_filter, CFG_PREFIX "v", BluescreenCallback, p_sys );
160 var_DelCallback( p_filter, CFG_PREFIX "ut", BluescreenCallback, p_sys );
161 var_DelCallback( p_filter, CFG_PREFIX "vt", BluescreenCallback, p_sys );
164 vlc_mutex_destroy( &p_sys->lock );
168 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
170 filter_sys_t *p_sys = p_filter->p_sys;
173 int i_lines = p_pic->p[ A_PLANE ].i_lines;
174 int i_pitch = p_pic->p[ A_PLANE ].i_pitch;
175 uint8_t *p_a = p_pic->p[ A_PLANE ].p_pixels;
177 uint8_t *p_u = p_pic->p[ U_PLANE ].p_pixels;
178 uint8_t *p_v = p_pic->p[ V_PLANE ].p_pixels;
179 uint8_t umin, umax, vmin, vmax;
181 if( p_pic->format.i_chroma != VLC_FOURCC('Y','U','V','A') )
184 "Unsupported input chroma \"%4s\". "
185 "Bluescreen can only use \"YUVA\".",
186 (char*)&p_pic->format.i_chroma );
190 p_sys->p_at = realloc( p_sys->p_at, i_lines * i_pitch * sizeof( uint8_t ) );
193 vlc_mutex_lock( &p_sys->lock );
194 umin = p_sys->i_u - p_sys->i_ut >= 0x00 ? p_sys->i_u - p_sys->i_ut : 0x00;
195 umax = p_sys->i_u + p_sys->i_ut <= 0xff ? p_sys->i_u + p_sys->i_ut : 0xff;
196 vmin = p_sys->i_v - p_sys->i_vt >= 0x00 ? p_sys->i_v - p_sys->i_vt : 0x00;
197 vmax = p_sys->i_v + p_sys->i_vt <= 0xff ? p_sys->i_v + p_sys->i_vt : 0xff;
198 vlc_mutex_unlock( &p_sys->lock );
200 for( i = 0; i < i_lines*i_pitch; i++ )
202 if( p_u[i] < umax && p_u[i] > umin
203 && p_v[i] < vmax && p_v[i] > vmin )
212 /* Gaussian convolution to make it look cleaner */
213 vlc_memset( p_a, 0, 2 * i_pitch );
214 for( i = 2; i < i_lines - 2; i++ )
216 p_a[i*i_pitch] = 0x00;
217 p_a[i*i_pitch+1] = 0x00;
218 for( j = 2; j < i_pitch - 2; j ++ )
220 p_a[i*i_pitch+j] = (uint8_t)((
222 ( p_at[(i-2)*i_pitch+j-2]<<1 )
223 + ( p_at[(i-2)*i_pitch+j-1]<<2 )
224 + ( p_at[(i-2)*i_pitch+j]<<2 )
225 + ( p_at[(i-2)*i_pitch+j+1]<<2 )
226 + ( p_at[(i-2)*i_pitch+j+2]<<1 )
228 + ( p_at[(i-1)*i_pitch+j-2]<<2 )
229 + ( p_at[(i-1)*i_pitch+j-1]<<3 )
230 + ( p_at[(i-1)*i_pitch+j]*12 )
231 + ( p_at[(i-1)*i_pitch+j+1]<<3 )
232 + ( p_at[(i-1)*i_pitch+j+2]<<2 )
234 + ( p_at[i*i_pitch+j-2]<<2 )
235 + ( p_at[i*i_pitch+j-1]*12 )
236 + ( p_at[i*i_pitch+j]<<4 )
237 + ( p_at[i*i_pitch+j+1]*12 )
238 + ( p_at[i*i_pitch+j+2]<<2 )
240 + ( p_at[(i+1)*i_pitch+j-2]<<2 )
241 + ( p_at[(i+1)*i_pitch+j-1]<<3 )
242 + ( p_at[(i+1)*i_pitch+j]*12 )
243 + ( p_at[(i+1)*i_pitch+j+1]<<3 )
244 + ( p_at[(i+1)*i_pitch+j+2]<<2 )
246 + ( p_at[(i+2)*i_pitch+j-2]<<1 )
247 + ( p_at[(i+2)*i_pitch+j-1]<<2 )
248 + ( p_at[(i+2)*i_pitch+j]<<2 )
249 + ( p_at[(i+2)*i_pitch+j+1]<<2 )
250 + ( p_at[(i+2)*i_pitch+j+2]<<1 )
252 if( p_a[i*i_pitch+j] < 0xbf ) p_a[i*i_pitch+j] = 0x00;
258 /*****************************************************************************
259 * Callback to update params on the fly
260 *****************************************************************************/
261 static int BluescreenCallback( vlc_object_t *p_this, char const *psz_var,
262 vlc_value_t oldval, vlc_value_t newval,
265 VLC_UNUSED(p_this); VLC_UNUSED(oldval);
266 filter_sys_t *p_sys = (filter_sys_t *) p_data;
268 vlc_mutex_lock( &p_sys->lock );
269 #define VAR_IS( a ) !strcmp( psz_var, CFG_PREFIX a )
271 p_sys->i_u = __MAX( 0, __MIN( 255, newval.i_int ) );
272 else if( VAR_IS( "v" ) )
273 p_sys->i_v = __MAX( 0, __MIN( 255, newval.i_int ) );
274 else if( VAR_IS( "ut" ) )
275 p_sys->i_ut = __MAX( 0, __MIN( 255, newval.i_int ) );
276 else if( VAR_IS( "vt" ) )
277 p_sys->i_vt = __MAX( 0, __MIN( 255, newval.i_int ) );
278 vlc_mutex_unlock( &p_sys->lock );