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 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
36 #include <vlc_filter.h>
37 #include <vlc_memory.h>
39 #define BLUESCREEN_HELP N_( \
40 "This effect, also known as \"greenscreen\" or \"chroma key\" blends " \
41 "the \"blue parts\" of the foreground image of the mosaic on the " \
42 "background (like weather forecasts). You can choose the \"key\" " \
43 "color for blending (blue by default)." )
45 #define BLUESCREENU_TEXT N_("Bluescreen U value")
46 #define BLUESCREENU_LONGTEXT N_( \
47 "\"U\" value for the bluescreen key color " \
48 "(in YUV values). From 0 to 255. Defaults to 120 for blue." )
49 #define BLUESCREENV_TEXT N_("Bluescreen V value")
50 #define BLUESCREENV_LONGTEXT N_( \
51 "\"V\" value for the bluescreen key color " \
52 "(in YUV values). From 0 to 255. Defaults to 90 for blue." )
53 #define BLUESCREENUTOL_TEXT N_("Bluescreen U tolerance")
54 #define BLUESCREENUTOL_LONGTEXT N_( \
55 "Tolerance of the bluescreen blender " \
56 "on color variations for the U plane. A value between 10 and 20 " \
58 #define BLUESCREENVTOL_TEXT N_("Bluescreen V tolerance")
59 #define BLUESCREENVTOL_LONGTEXT N_( \
60 "Tolerance of the bluescreen blender " \
61 "on color variations for the V plane. A value between 10 and 20 " \
64 #define CFG_PREFIX "bluescreen-"
66 /*****************************************************************************
68 *****************************************************************************/
69 static int Create ( vlc_object_t * );
70 static void Destroy ( vlc_object_t * );
72 static picture_t *Filter( filter_t *, picture_t * );
73 static int BluescreenCallback( vlc_object_t *, char const *,
74 vlc_value_t, vlc_value_t, void * );
76 /*****************************************************************************
78 *****************************************************************************/
80 set_description( N_("Bluescreen video filter") )
81 set_shortname( N_("Bluescreen" ))
82 set_help( BLUESCREEN_HELP )
83 set_category( CAT_VIDEO )
84 set_subcategory( SUBCAT_VIDEO_VFILTER )
85 set_capability( "video filter2", 0 )
86 add_shortcut( "bluescreen" )
87 set_callbacks( Create, Destroy )
89 add_integer_with_range( CFG_PREFIX "u", 120, 0, 255, NULL,
90 BLUESCREENU_TEXT, BLUESCREENU_LONGTEXT, false )
91 add_integer_with_range( CFG_PREFIX "v", 90, 0, 255, NULL,
92 BLUESCREENV_TEXT, BLUESCREENV_LONGTEXT, false )
93 add_integer_with_range( CFG_PREFIX "ut", 17, 0, 255, NULL,
94 BLUESCREENUTOL_TEXT, BLUESCREENUTOL_LONGTEXT,
96 add_integer_with_range( CFG_PREFIX "vt", 17, 0, 255, NULL,
97 BLUESCREENVTOL_TEXT, BLUESCREENVTOL_LONGTEXT,
101 static const char *const ppsz_filter_options[] = {
102 "u", "v", "ut", "vt", NULL
108 int i_u, i_v, i_ut, i_vt;
112 static int Create( vlc_object_t *p_this )
114 filter_t *p_filter = (filter_t *)p_this;
117 if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA )
120 "Unsupported input chroma \"%4s\". "
121 "Bluescreen can only use \"YUVA\".",
122 (char*)&p_filter->fmt_in.video.i_chroma );
126 /* Allocate structure */
127 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
128 if( p_filter->p_sys == NULL )
130 p_sys = p_filter->p_sys;
132 config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
136 vlc_mutex_init( &p_sys->lock );
137 #define GET_VAR( name, min, max ) \
138 val = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX #name ); \
139 p_sys->i_##name = __MIN( max, __MAX( min, val ) ); \
140 var_AddCallback( p_filter, CFG_PREFIX #name, BluescreenCallback, p_sys );
142 GET_VAR( u, 0x00, 0xff );
143 GET_VAR( v, 0x00, 0xff );
144 GET_VAR( ut, 0x00, 0xff );
145 GET_VAR( vt, 0x00, 0xff );
149 p_filter->pf_video_filter = Filter;
154 static void Destroy( vlc_object_t *p_this )
156 filter_t *p_filter = (filter_t *)p_this;
157 filter_sys_t *p_sys = p_filter->p_sys;
159 var_DelCallback( p_filter, CFG_PREFIX "u", BluescreenCallback, p_sys );
160 var_DelCallback( p_filter, CFG_PREFIX "v", BluescreenCallback, p_sys );
161 var_DelCallback( p_filter, CFG_PREFIX "ut", BluescreenCallback, p_sys );
162 var_DelCallback( p_filter, CFG_PREFIX "vt", BluescreenCallback, p_sys );
165 vlc_mutex_destroy( &p_sys->lock );
169 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
171 filter_sys_t *p_sys = p_filter->p_sys;
174 int i_lines = p_pic->p[ A_PLANE ].i_lines;
175 int i_pitch = p_pic->p[ A_PLANE ].i_pitch;
176 uint8_t *p_a = p_pic->p[ A_PLANE ].p_pixels;
178 uint8_t *p_u = p_pic->p[ U_PLANE ].p_pixels;
179 uint8_t *p_v = p_pic->p[ V_PLANE ].p_pixels;
180 uint8_t umin, umax, vmin, vmax;
182 if( p_pic->format.i_chroma != VLC_CODEC_YUVA )
185 "Unsupported input chroma \"%4s\". "
186 "Bluescreen can only use \"YUVA\".",
187 (char*)&p_pic->format.i_chroma );
191 p_sys->p_at = realloc_or_free( p_sys->p_at,
192 i_lines * i_pitch * sizeof( uint8_t ) );
193 assert( p_sys->p_at );
196 vlc_mutex_lock( &p_sys->lock );
197 umin = p_sys->i_u - p_sys->i_ut >= 0x00 ? p_sys->i_u - p_sys->i_ut : 0x00;
198 umax = p_sys->i_u + p_sys->i_ut <= 0xff ? p_sys->i_u + p_sys->i_ut : 0xff;
199 vmin = p_sys->i_v - p_sys->i_vt >= 0x00 ? p_sys->i_v - p_sys->i_vt : 0x00;
200 vmax = p_sys->i_v + p_sys->i_vt <= 0xff ? p_sys->i_v + p_sys->i_vt : 0xff;
201 vlc_mutex_unlock( &p_sys->lock );
203 for( i = 0; i < i_lines*i_pitch; i++ )
205 if( p_u[i] < umax && p_u[i] > umin
206 && p_v[i] < vmax && p_v[i] > vmin )
215 /* Gaussian convolution to make it look cleaner */
216 vlc_memset( p_a, 0, 2 * i_pitch );
217 for( i = 2; i < i_lines - 2; i++ )
219 p_a[i*i_pitch] = 0x00;
220 p_a[i*i_pitch+1] = 0x00;
221 for( j = 2; j < i_pitch - 2; j ++ )
223 p_a[i*i_pitch+j] = (uint8_t)((
225 ( p_at[(i-2)*i_pitch+j-2]<<1 )
226 + ( p_at[(i-2)*i_pitch+j-1]<<2 )
227 + ( p_at[(i-2)*i_pitch+j]<<2 )
228 + ( p_at[(i-2)*i_pitch+j+1]<<2 )
229 + ( p_at[(i-2)*i_pitch+j+2]<<1 )
231 + ( p_at[(i-1)*i_pitch+j-2]<<2 )
232 + ( p_at[(i-1)*i_pitch+j-1]<<3 )
233 + ( p_at[(i-1)*i_pitch+j]*12 )
234 + ( p_at[(i-1)*i_pitch+j+1]<<3 )
235 + ( p_at[(i-1)*i_pitch+j+2]<<2 )
237 + ( p_at[i*i_pitch+j-2]<<2 )
238 + ( p_at[i*i_pitch+j-1]*12 )
239 + ( p_at[i*i_pitch+j]<<4 )
240 + ( p_at[i*i_pitch+j+1]*12 )
241 + ( p_at[i*i_pitch+j+2]<<2 )
243 + ( p_at[(i+1)*i_pitch+j-2]<<2 )
244 + ( p_at[(i+1)*i_pitch+j-1]<<3 )
245 + ( p_at[(i+1)*i_pitch+j]*12 )
246 + ( p_at[(i+1)*i_pitch+j+1]<<3 )
247 + ( p_at[(i+1)*i_pitch+j+2]<<2 )
249 + ( p_at[(i+2)*i_pitch+j-2]<<1 )
250 + ( p_at[(i+2)*i_pitch+j-1]<<2 )
251 + ( p_at[(i+2)*i_pitch+j]<<2 )
252 + ( p_at[(i+2)*i_pitch+j+1]<<2 )
253 + ( p_at[(i+2)*i_pitch+j+2]<<1 )
255 if( p_a[i*i_pitch+j] < 0xbf ) p_a[i*i_pitch+j] = 0x00;
261 /*****************************************************************************
262 * Callback to update params on the fly
263 *****************************************************************************/
264 static int BluescreenCallback( vlc_object_t *p_this, char const *psz_var,
265 vlc_value_t oldval, vlc_value_t newval,
268 VLC_UNUSED(p_this); VLC_UNUSED(oldval);
269 filter_sys_t *p_sys = (filter_sys_t *) p_data;
271 vlc_mutex_lock( &p_sys->lock );
272 #define VAR_IS( a ) !strcmp( psz_var, CFG_PREFIX a )
274 p_sys->i_u = __MAX( 0, __MIN( 255, newval.i_int ) );
275 else if( VAR_IS( "v" ) )
276 p_sys->i_v = __MAX( 0, __MIN( 255, newval.i_int ) );
277 else if( VAR_IS( "ut" ) )
278 p_sys->i_ut = __MAX( 0, __MIN( 255, newval.i_int ) );
279 else if( VAR_IS( "vt" ) )
280 p_sys->i_vt = __MAX( 0, __MIN( 255, newval.i_int ) );
281 vlc_mutex_unlock( &p_sys->lock );