1 /*****************************************************************************
2 * colorthres.c: Theshold color based on similarity to reference color
3 *****************************************************************************
4 * Copyright (C) 2000-2006 the VideoLAN team
7 * Authors: Sigmund Augdal <dnumgis@videolan.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>
39 #include "vlc_filter.h"
40 #include "filter_picture.h"
42 /*****************************************************************************
44 *****************************************************************************/
45 static int Create ( vlc_object_t * );
46 static void Destroy ( vlc_object_t * );
48 static picture_t *Filter( filter_t *, picture_t * );
50 /*****************************************************************************
52 *****************************************************************************/
53 #define COLOR_TEXT N_("Color")
54 #define COLOR_LONGTEXT N_("Colors similar to this will be kept, others will be "\
55 "grayscaled. This must be an hexadecimal (like HTML colors). The first two "\
56 "chars are for red, then green, then blue. #000000 = black, #FF0000 = red,"\
57 " #00FF00 = green, #FFFF00 = yellow (red + green), #FFFFFF = white" )
58 static const int pi_color_values[] = {
59 0x00FF0000, 0x00FF00FF, 0x00FFFF00, 0x0000FF00, 0x000000FF, 0x0000FFFF };
61 static const char *const ppsz_color_descriptions[] = {
62 N_("Red"), N_("Fuchsia"), N_("Yellow"), N_("Lime"), N_("Blue"), N_("Aqua") };
64 #define CFG_PREFIX "colorthres-"
67 set_description( N_("Color threshold filter") );
68 set_shortname( N_("Color threshold" ));
69 set_category( CAT_VIDEO );
70 set_subcategory( SUBCAT_VIDEO_VFILTER );
71 set_capability( "video filter2", 0 );
72 add_integer( CFG_PREFIX "color", 0x00FF0000, NULL, COLOR_TEXT,
73 COLOR_LONGTEXT, false );
74 change_integer_list( pi_color_values, ppsz_color_descriptions, 0 );
75 add_integer( CFG_PREFIX "saturationthres", 20, NULL,
76 _("Saturaton threshold"), "", false );
77 add_integer( CFG_PREFIX "similaritythres", 15, NULL,
78 _("Similarity threshold"), "", false );
79 set_callbacks( Create, Destroy );
82 static const char *const ppsz_filter_options[] = {
83 "color", "saturationthes", "similaritythres", NULL
86 /*****************************************************************************
87 * filter_sys_t: adjust filter method descriptor
88 *****************************************************************************/
93 /*****************************************************************************
94 * Create: allocates adjust video thread output method
95 *****************************************************************************
96 * This function allocates and initializes a adjust vout method.
97 *****************************************************************************/
98 static int Create( vlc_object_t *p_this )
100 filter_t *p_filter = (filter_t *)p_this;
102 switch( p_filter->fmt_in.video.i_chroma )
108 msg_Err( p_filter, "Unsupported input chroma (%4s)",
109 (char*)&(p_filter->fmt_in.video.i_chroma) );
113 if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
115 msg_Err( p_filter, "Input and output chromas don't match" );
119 config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
121 var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "color" );
122 var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "similaritythres" );
123 var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "saturationthres" );
125 /* Allocate structure */
126 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
127 if( p_filter->p_sys == NULL )
130 p_filter->pf_video_filter = Filter;
135 /*****************************************************************************
136 * Destroy: destroy adjust video thread output method
137 *****************************************************************************
138 * Terminate an output method created by adjustCreateOutputMethod
139 *****************************************************************************/
140 static void Destroy( vlc_object_t *p_this )
142 filter_t *p_filter = (filter_t *)p_this;
143 free( p_filter->p_sys );
146 /*****************************************************************************
147 * Render: displays previously rendered output
148 *****************************************************************************
149 * This function send the currently rendered image to adjust modified image,
150 * waits until it is displayed and switch the two rendering buffers, preparing
152 *****************************************************************************/
153 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
156 uint8_t *p_in_y, *p_in_u, *p_in_v, *p_in_end_u;
157 uint8_t *p_out_y, *p_out_u, *p_out_v;
158 int i_simthres = var_GetInteger( p_filter, "colorthres-similaritythres" );
159 int i_satthres = var_GetInteger( p_filter, "colorthres-saturationthres" );
160 int i_color = var_GetInteger( p_filter, "colorthres-color" );
162 if( !p_pic ) return NULL;
164 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
167 msg_Warn( p_filter, "can't get output picture" );
168 if( p_pic->pf_release )
169 p_pic->pf_release( p_pic );
173 p_in_u = p_pic->p[U_PLANE].p_pixels;
174 p_in_v = p_pic->p[V_PLANE].p_pixels;
175 p_in_y = p_pic->p[Y_PLANE].p_pixels;
176 p_in_end_u = p_in_u + p_pic->p[U_PLANE].i_visible_lines
177 * p_pic->p[U_PLANE].i_pitch - 8;
179 p_out_y = p_outpic->p[Y_PLANE].p_pixels;
180 p_out_u = p_outpic->p[U_PLANE].p_pixels;
181 p_out_v = p_outpic->p[V_PLANE].p_pixels;
183 /* Create grayscale version of input */
184 vlc_memcpy( p_out_y, p_in_y, p_pic->p[Y_PLANE].i_visible_lines
185 * p_pic->p[Y_PLANE].i_pitch - 8 );
186 vlc_memset( p_out_u, 0x80, p_pic->p[U_PLANE].i_visible_lines
187 * p_pic->p[U_PLANE].i_pitch - 8 );
188 vlc_memset( p_out_v, 0x80, p_pic->p[U_PLANE].i_visible_lines
189 * p_pic->p[U_PLANE].i_pitch - 8 );
192 * Do the U and V planes
194 int i_red = ( i_color & 0xFF0000 ) >> 16;
195 int i_green = ( i_color & 0xFF00 ) >> 8;
196 int i_blue = i_color & 0xFF;
197 int i_u = (int8_t)(( -38 * i_red - 74 * i_green +
198 112 * i_blue + 128) >> 8) + 128;
199 int i_v = (int8_t)(( 112 * i_red - 94 * i_green -
200 18 * i_blue + 128) >> 8) + 128;
201 int refu = i_u - 0x80; /*bright red*/
202 int refv = i_v - 0x80;
203 int reflength = sqrt(refu*refu+refv*refv);
205 while( p_in_u < p_in_end_u ) {
206 /* Length of color vector */
207 int inu = (*p_in_u) - 0x80;
208 int inv = (*p_in_v) - 0x80;
209 int length = sqrt(inu*inu+inv*inv);
211 int diffu = refu * length - inu *reflength;
212 int diffv = refv * length - inv *reflength;
213 long long int difflen2=diffu*diffu;
214 difflen2 +=diffv*diffv;
215 long long int thres = length*reflength;
217 if( length > i_satthres && (difflen2*i_simthres< thres ) ) {
220 // fprintf(stderr,"keeping color %d %d\n", length, difflen2);
228 return CopyInfoAndRelease( p_outpic, p_pic );