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 *****************************************************************************/
31 #include "vlc_filter.h"
33 #define BLUESCREEN_HELP N_( \
34 "This effect, also known as \"greenscreen\" or \"chroma key\" blends " \
35 "the \"blue parts\" of the foreground image of the mosaic on the " \
36 "background (like weather forcasts). You can choose the \"key\" " \
37 "color for blending (blyyue by default)." )
39 #define BLUESCREENU_TEXT N_("Bluescreen U value")
40 #define BLUESCREENU_LONGTEXT N_( \
41 "\"U\" value for the bluescreen key color " \
42 "(in YUV values). From 0 to 255. Defaults to 120 for blue." )
43 #define BLUESCREENV_TEXT N_("Bluescreen V value")
44 #define BLUESCREENV_LONGTEXT N_( \
45 "\"V\" value for the bluescreen key color " \
46 "(in YUV values). From 0 to 255. Defaults to 90 for blue." )
47 #define BLUESCREENUTOL_TEXT N_("Bluescreen U tolerance")
48 #define BLUESCREENUTOL_LONGTEXT N_( \
49 "Tolerance of the bluescreen blender " \
50 "on color variations for the U plane. A value between 10 and 20 " \
52 #define BLUESCREENVTOL_TEXT N_("Bluescreen V tolerance")
53 #define BLUESCREENVTOL_LONGTEXT N_( \
54 "Tolerance of the bluescreen blender " \
55 "on color variations for the V plane. A value between 10 and 20 " \
58 #define CFG_PREFIX "bluescreen-"
60 /*****************************************************************************
62 *****************************************************************************/
63 static int Create ( vlc_object_t * );
64 static void Destroy ( vlc_object_t * );
66 static picture_t *Filter( filter_t *, picture_t * );
67 static int BluescreenCallback( vlc_object_t *, char const *,
68 vlc_value_t, vlc_value_t, void * );
70 /*****************************************************************************
72 *****************************************************************************/
74 set_description( _("Bluescreen video filter") );
75 set_shortname( _("Bluescreen" ));
76 set_help( BLUESCREEN_HELP );
77 set_category( CAT_VIDEO );
78 set_subcategory( SUBCAT_VIDEO_VFILTER );
79 set_capability( "video filter2", 0 );
80 add_shortcut( "bluescreen" );
81 set_callbacks( Create, Destroy );
83 add_integer_with_range( CFG_PREFIX "u", 120, 0, 255, NULL,
84 BLUESCREENU_TEXT, BLUESCREENU_LONGTEXT, VLC_FALSE );
85 add_integer_with_range( CFG_PREFIX "v", 90, 0, 255, NULL,
86 BLUESCREENV_TEXT, BLUESCREENV_LONGTEXT, VLC_FALSE );
87 add_integer_with_range( CFG_PREFIX "ut", 17, 0, 255, NULL,
88 BLUESCREENUTOL_TEXT, BLUESCREENUTOL_LONGTEXT,
90 add_integer_with_range( CFG_PREFIX "vt", 17, 0, 255, NULL,
91 BLUESCREENVTOL_TEXT, BLUESCREENVTOL_LONGTEXT,
95 static const char *ppsz_filter_options[] = {
96 "u", "v", "ut", "vt", NULL
101 int i_u, i_v, i_ut, i_vt;
105 static int Create( vlc_object_t *p_this )
107 filter_t *p_filter = (filter_t *)p_this;
110 if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') )
113 "Unsupported input chroma \"%4s\". "
114 "Bluescreen can only use \"YUVA\".",
115 (char*)&p_filter->fmt_in.video.i_chroma );
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" );
126 p_sys = p_filter->p_sys;
128 config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
131 #define GET_VAR( name, min, max ) \
132 p_sys->i_##name = __MIN( max, __MAX( min, \
133 var_CreateGetIntegerCommand( p_filter, CFG_PREFIX #name ) ) ); \
134 var_AddCallback( p_filter, CFG_PREFIX #name, BluescreenCallback, p_sys );
136 GET_VAR( u, 0x00, 0xff );
137 GET_VAR( v, 0x00, 0xff );
138 GET_VAR( ut, 0x00, 0xff );
139 GET_VAR( vt, 0x00, 0xff );
142 p_filter->pf_video_filter = Filter;
147 static void Destroy( vlc_object_t *p_this )
149 filter_t *p_filter = (filter_t *)p_this;
151 free( p_filter->p_sys->p_at );
152 free( p_filter->p_sys );
155 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
157 filter_sys_t *p_sys = p_filter->p_sys;
160 int i_lines = p_pic->p[ A_PLANE ].i_lines;
161 int i_pitch = p_pic->p[ A_PLANE ].i_pitch;
162 uint8_t *p_a = p_pic->p[ A_PLANE ].p_pixels;
164 uint8_t *p_u = p_pic->p[ U_PLANE ].p_pixels;
165 uint8_t *p_v = p_pic->p[ V_PLANE ].p_pixels;
166 uint8_t umin, umax, vmin, vmax;
168 if( p_pic->format.i_chroma != VLC_FOURCC('Y','U','V','A') )
171 "Unsupported input chroma \"%4s\". "
172 "Bluescreen can only use \"YUVA\".",
173 (char*)&p_pic->format.i_chroma );
177 p_sys->p_at = realloc( p_sys->p_at, i_lines * i_pitch * sizeof( uint8_t ) );
180 umin = p_sys->i_u - p_sys->i_ut >= 0x00 ? p_sys->i_u - p_sys->i_ut : 0x00;
181 umax = p_sys->i_u + p_sys->i_ut <= 0xff ? p_sys->i_u + p_sys->i_ut : 0xff;
182 vmin = p_sys->i_v - p_sys->i_vt >= 0x00 ? p_sys->i_v - p_sys->i_vt : 0x00;
183 vmax = p_sys->i_v + p_sys->i_vt <= 0xff ? p_sys->i_v + p_sys->i_vt : 0xff;
185 for( i = 0; i < i_lines*i_pitch; i++ )
187 if( p_u[i] < umax && p_u[i] > umin
188 && p_v[i] < vmax && p_v[i] > vmin )
197 /* Gaussian convolution to make it look cleaner */
198 p_filter->p_libvlc->pf_memset( p_a, 0, 2 * i_pitch );
199 for( i = 2; i < i_lines - 2; i++ )
201 p_a[i*i_pitch] = 0x00;
202 p_a[i*i_pitch+1] = 0x00;
203 for( j = 2; j < i_pitch - 2; j ++ )
205 p_a[i*i_pitch+j] = (uint8_t)((
207 ( p_at[(i-2)*i_pitch+j-2]<<1 )
208 + ( p_at[(i-2)*i_pitch+j-1]<<2 )
209 + ( p_at[(i-2)*i_pitch+j]<<2 )
210 + ( p_at[(i-2)*i_pitch+j+1]<<2 )
211 + ( p_at[(i-2)*i_pitch+j+2]<<1 )
213 + ( p_at[(i-1)*i_pitch+j-2]<<2 )
214 + ( p_at[(i-1)*i_pitch+j-1]<<3 )
215 + ( p_at[(i-1)*i_pitch+j]*12 )
216 + ( p_at[(i-1)*i_pitch+j+1]<<3 )
217 + ( p_at[(i-1)*i_pitch+j+2]<<2 )
219 + ( p_at[i*i_pitch+j-2]<<2 )
220 + ( p_at[i*i_pitch+j-1]*12 )
221 + ( p_at[i*i_pitch+j]<<4 )
222 + ( p_at[i*i_pitch+j+1]*12 )
223 + ( p_at[i*i_pitch+j+2]<<2 )
225 + ( p_at[(i+1)*i_pitch+j-2]<<2 )
226 + ( p_at[(i+1)*i_pitch+j-1]<<3 )
227 + ( p_at[(i+1)*i_pitch+j]*12 )
228 + ( p_at[(i+1)*i_pitch+j+1]<<3 )
229 + ( p_at[(i+1)*i_pitch+j+2]<<2 )
231 + ( p_at[(i+2)*i_pitch+j-2]<<1 )
232 + ( p_at[(i+2)*i_pitch+j-1]<<2 )
233 + ( p_at[(i+2)*i_pitch+j]<<2 )
234 + ( p_at[(i+2)*i_pitch+j+1]<<2 )
235 + ( p_at[(i+2)*i_pitch+j+2]<<1 )
237 if( p_a[i*i_pitch+j] < 0xbf ) p_a[i*i_pitch+j] = 0x00;
243 /*****************************************************************************
244 * Callback to update params on the fly
245 *****************************************************************************/
246 static int BluescreenCallback( vlc_object_t *p_this, char const *psz_var,
247 vlc_value_t oldval, vlc_value_t newval,
250 filter_sys_t *p_sys = (filter_sys_t *) p_data;
252 #define VAR_IS( a ) !strcmp( psz_var, CFG_PREFIX a )
255 p_sys->i_u = __MAX( 0, __MIN( 255, newval.i_int ) );
257 else if( VAR_IS( "v" ) )
259 p_sys->i_v = __MAX( 0, __MIN( 255, newval.i_int ) );
261 else if( VAR_IS( "ut" ) )
263 p_sys->i_ut = __MAX( 0, __MIN( 255, newval.i_int ) );
265 else if( VAR_IS( "vt" ) )
267 p_sys->i_vt = __MAX( 0, __MIN( 255, newval.i_int ) );