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 *****************************************************************************/
35 #include "vlc_filter.h"
37 #define BLUESCREEN_HELP N_( \
38 "This effect, also known as \"greenscreen\" or \"chroma key\" blends " \
39 "the \"blue parts\" of the foreground image of the mosaic on the " \
40 "background (like weather forcasts). You can choose the \"key\" " \
41 "color for blending (blyyue by default)." )
43 #define BLUESCREENU_TEXT N_("Bluescreen U value")
44 #define BLUESCREENU_LONGTEXT N_( \
45 "\"U\" value for the bluescreen key color " \
46 "(in YUV values). From 0 to 255. Defaults to 120 for blue." )
47 #define BLUESCREENV_TEXT N_("Bluescreen V value")
48 #define BLUESCREENV_LONGTEXT N_( \
49 "\"V\" value for the bluescreen key color " \
50 "(in YUV values). From 0 to 255. Defaults to 90 for blue." )
51 #define BLUESCREENUTOL_TEXT N_("Bluescreen U tolerance")
52 #define BLUESCREENUTOL_LONGTEXT N_( \
53 "Tolerance of the bluescreen blender " \
54 "on color variations for the U plane. A value between 10 and 20 " \
56 #define BLUESCREENVTOL_TEXT N_("Bluescreen V tolerance")
57 #define BLUESCREENVTOL_LONGTEXT N_( \
58 "Tolerance of the bluescreen blender " \
59 "on color variations for the V plane. A value between 10 and 20 " \
62 #define CFG_PREFIX "bluescreen-"
64 /*****************************************************************************
66 *****************************************************************************/
67 static int Create ( vlc_object_t * );
68 static void Destroy ( vlc_object_t * );
70 static picture_t *Filter( filter_t *, picture_t * );
71 static int BluescreenCallback( vlc_object_t *, char const *,
72 vlc_value_t, vlc_value_t, void * );
74 /*****************************************************************************
76 *****************************************************************************/
78 set_description( _("Bluescreen video filter") );
79 set_shortname( _("Bluescreen" ));
80 set_help( BLUESCREEN_HELP );
81 set_category( CAT_VIDEO );
82 set_subcategory( SUBCAT_VIDEO_VFILTER );
83 set_capability( "video filter2", 0 );
84 add_shortcut( "bluescreen" );
85 set_callbacks( Create, Destroy );
87 add_integer_with_range( CFG_PREFIX "u", 120, 0, 255, NULL,
88 BLUESCREENU_TEXT, BLUESCREENU_LONGTEXT, VLC_FALSE );
89 add_integer_with_range( CFG_PREFIX "v", 90, 0, 255, NULL,
90 BLUESCREENV_TEXT, BLUESCREENV_LONGTEXT, VLC_FALSE );
91 add_integer_with_range( CFG_PREFIX "ut", 17, 0, 255, NULL,
92 BLUESCREENUTOL_TEXT, BLUESCREENUTOL_LONGTEXT,
94 add_integer_with_range( CFG_PREFIX "vt", 17, 0, 255, NULL,
95 BLUESCREENVTOL_TEXT, BLUESCREENVTOL_LONGTEXT,
99 static const char *ppsz_filter_options[] = {
100 "u", "v", "ut", "vt", NULL
105 int i_u, i_v, i_ut, i_vt;
109 static int Create( vlc_object_t *p_this )
111 filter_t *p_filter = (filter_t *)p_this;
114 if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') )
117 "Unsupported input chroma \"%4s\". "
118 "Bluescreen can only use \"YUVA\".",
119 (char*)&p_filter->fmt_in.video.i_chroma );
123 /* Allocate structure */
124 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
125 if( p_filter->p_sys == NULL )
127 msg_Err( p_filter, "out of memory" );
130 p_sys = p_filter->p_sys;
132 config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
135 #define GET_VAR( name, min, max ) \
136 p_sys->i_##name = __MIN( max, __MAX( min, \
137 var_CreateGetIntegerCommand( p_filter, CFG_PREFIX #name ) ) ); \
138 var_AddCallback( p_filter, CFG_PREFIX #name, BluescreenCallback, p_sys );
140 GET_VAR( u, 0x00, 0xff );
141 GET_VAR( v, 0x00, 0xff );
142 GET_VAR( ut, 0x00, 0xff );
143 GET_VAR( vt, 0x00, 0xff );
146 p_filter->pf_video_filter = Filter;
151 static void Destroy( vlc_object_t *p_this )
153 filter_t *p_filter = (filter_t *)p_this;
155 free( p_filter->p_sys->p_at );
156 free( p_filter->p_sys );
159 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
161 filter_sys_t *p_sys = p_filter->p_sys;
164 int i_lines = p_pic->p[ A_PLANE ].i_lines;
165 int i_pitch = p_pic->p[ A_PLANE ].i_pitch;
166 uint8_t *p_a = p_pic->p[ A_PLANE ].p_pixels;
168 uint8_t *p_u = p_pic->p[ U_PLANE ].p_pixels;
169 uint8_t *p_v = p_pic->p[ V_PLANE ].p_pixels;
170 uint8_t umin, umax, vmin, vmax;
172 if( p_pic->format.i_chroma != VLC_FOURCC('Y','U','V','A') )
175 "Unsupported input chroma \"%4s\". "
176 "Bluescreen can only use \"YUVA\".",
177 (char*)&p_pic->format.i_chroma );
181 p_sys->p_at = realloc( p_sys->p_at, i_lines * i_pitch * sizeof( uint8_t ) );
184 umin = p_sys->i_u - p_sys->i_ut >= 0x00 ? p_sys->i_u - p_sys->i_ut : 0x00;
185 umax = p_sys->i_u + p_sys->i_ut <= 0xff ? p_sys->i_u + p_sys->i_ut : 0xff;
186 vmin = p_sys->i_v - p_sys->i_vt >= 0x00 ? p_sys->i_v - p_sys->i_vt : 0x00;
187 vmax = p_sys->i_v + p_sys->i_vt <= 0xff ? p_sys->i_v + p_sys->i_vt : 0xff;
189 for( i = 0; i < i_lines*i_pitch; i++ )
191 if( p_u[i] < umax && p_u[i] > umin
192 && p_v[i] < vmax && p_v[i] > vmin )
201 /* Gaussian convolution to make it look cleaner */
202 p_filter->p_libvlc->pf_memset( p_a, 0, 2 * i_pitch );
203 for( i = 2; i < i_lines - 2; i++ )
205 p_a[i*i_pitch] = 0x00;
206 p_a[i*i_pitch+1] = 0x00;
207 for( j = 2; j < i_pitch - 2; j ++ )
209 p_a[i*i_pitch+j] = (uint8_t)((
211 ( p_at[(i-2)*i_pitch+j-2]<<1 )
212 + ( p_at[(i-2)*i_pitch+j-1]<<2 )
213 + ( p_at[(i-2)*i_pitch+j]<<2 )
214 + ( p_at[(i-2)*i_pitch+j+1]<<2 )
215 + ( p_at[(i-2)*i_pitch+j+2]<<1 )
217 + ( p_at[(i-1)*i_pitch+j-2]<<2 )
218 + ( p_at[(i-1)*i_pitch+j-1]<<3 )
219 + ( p_at[(i-1)*i_pitch+j]*12 )
220 + ( p_at[(i-1)*i_pitch+j+1]<<3 )
221 + ( p_at[(i-1)*i_pitch+j+2]<<2 )
223 + ( p_at[i*i_pitch+j-2]<<2 )
224 + ( p_at[i*i_pitch+j-1]*12 )
225 + ( p_at[i*i_pitch+j]<<4 )
226 + ( p_at[i*i_pitch+j+1]*12 )
227 + ( p_at[i*i_pitch+j+2]<<2 )
229 + ( p_at[(i+1)*i_pitch+j-2]<<2 )
230 + ( p_at[(i+1)*i_pitch+j-1]<<3 )
231 + ( p_at[(i+1)*i_pitch+j]*12 )
232 + ( p_at[(i+1)*i_pitch+j+1]<<3 )
233 + ( p_at[(i+1)*i_pitch+j+2]<<2 )
235 + ( p_at[(i+2)*i_pitch+j-2]<<1 )
236 + ( p_at[(i+2)*i_pitch+j-1]<<2 )
237 + ( p_at[(i+2)*i_pitch+j]<<2 )
238 + ( p_at[(i+2)*i_pitch+j+1]<<2 )
239 + ( p_at[(i+2)*i_pitch+j+2]<<1 )
241 if( p_a[i*i_pitch+j] < 0xbf ) p_a[i*i_pitch+j] = 0x00;
247 /*****************************************************************************
248 * Callback to update params on the fly
249 *****************************************************************************/
250 static int BluescreenCallback( vlc_object_t *p_this, char const *psz_var,
251 vlc_value_t oldval, vlc_value_t newval,
254 VLC_UNUSED(p_this); VLC_UNUSED(oldval);
255 filter_sys_t *p_sys = (filter_sys_t *) p_data;
257 #define VAR_IS( a ) !strcmp( psz_var, CFG_PREFIX a )
260 p_sys->i_u = __MAX( 0, __MIN( 255, newval.i_int ) );
262 else if( VAR_IS( "v" ) )
264 p_sys->i_v = __MAX( 0, __MIN( 255, newval.i_int ) );
266 else if( VAR_IS( "ut" ) )
268 p_sys->i_ut = __MAX( 0, __MIN( 255, newval.i_int ) );
270 else if( VAR_IS( "vt" ) )
272 p_sys->i_vt = __MAX( 0, __MIN( 255, newval.i_int ) );