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 *****************************************************************************/
35 #include <vlc_common.h>
36 #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, NULL )
75 add_integer( CFG_PREFIX "saturationthres", 20, NULL,
76 N_("Saturaton threshold"), "", false )
77 add_integer( CFG_PREFIX "similaritythres", 15, NULL,
78 N_("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_Create( p_filter, CFG_PREFIX "color", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT | VLC_VAR_ISCOMMAND );
122 var_Create( p_filter, CFG_PREFIX "similaritythres", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT | VLC_VAR_ISCOMMAND );
123 var_Create( p_filter, CFG_PREFIX "saturationthres", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT | VLC_VAR_ISCOMMAND );
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 = filter_NewPicture( p_filter );
167 picture_Release( p_pic );
171 p_in_u = p_pic->p[U_PLANE].p_pixels;
172 p_in_v = p_pic->p[V_PLANE].p_pixels;
173 p_in_y = p_pic->p[Y_PLANE].p_pixels;
174 p_in_end_u = p_in_u + p_pic->p[U_PLANE].i_visible_lines
175 * p_pic->p[U_PLANE].i_pitch - 8;
177 p_out_y = p_outpic->p[Y_PLANE].p_pixels;
178 p_out_u = p_outpic->p[U_PLANE].p_pixels;
179 p_out_v = p_outpic->p[V_PLANE].p_pixels;
181 /* Create grayscale version of input */
182 vlc_memcpy( p_out_y, p_in_y, p_pic->p[Y_PLANE].i_visible_lines
183 * p_pic->p[Y_PLANE].i_pitch - 8 );
184 vlc_memset( p_out_u, 0x80, p_pic->p[U_PLANE].i_visible_lines
185 * p_pic->p[U_PLANE].i_pitch - 8 );
186 vlc_memset( p_out_v, 0x80, p_pic->p[U_PLANE].i_visible_lines
187 * p_pic->p[U_PLANE].i_pitch - 8 );
190 * Do the U and V planes
192 int i_red = ( i_color & 0xFF0000 ) >> 16;
193 int i_green = ( i_color & 0xFF00 ) >> 8;
194 int i_blue = i_color & 0xFF;
195 int i_u = (int8_t)(( -38 * i_red - 74 * i_green +
196 112 * i_blue + 128) >> 8) + 128;
197 int i_v = (int8_t)(( 112 * i_red - 94 * i_green -
198 18 * i_blue + 128) >> 8) + 128;
199 int refu = i_u - 0x80; /*bright red*/
200 int refv = i_v - 0x80;
201 int reflength = sqrt(refu*refu+refv*refv);
203 while( p_in_u < p_in_end_u ) {
204 /* Length of color vector */
205 int inu = (*p_in_u) - 0x80;
206 int inv = (*p_in_v) - 0x80;
207 int length = sqrt(inu*inu+inv*inv);
209 int diffu = refu * length - inu *reflength;
210 int diffv = refv * length - inv *reflength;
211 long long int difflen2=diffu*diffu;
212 difflen2 +=diffv*diffv;
213 long long int thres = length*reflength;
215 if( length > i_satthres && (difflen2*i_simthres< thres ) ) {
218 // fprintf(stderr,"keeping color %d %d\n", length, difflen2);
226 return CopyInfoAndRelease( p_outpic, p_pic );