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_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 )
129 msg_Err( p_filter, "out of memory" );
133 p_filter->pf_video_filter = Filter;
138 /*****************************************************************************
139 * Destroy: destroy adjust video thread output method
140 *****************************************************************************
141 * Terminate an output method created by adjustCreateOutputMethod
142 *****************************************************************************/
143 static void Destroy( vlc_object_t *p_this )
145 filter_t *p_filter = (filter_t *)p_this;
146 free( p_filter->p_sys );
149 /*****************************************************************************
150 * Render: displays previously rendered output
151 *****************************************************************************
152 * This function send the currently rendered image to adjust modified image,
153 * waits until it is displayed and switch the two rendering buffers, preparing
155 *****************************************************************************/
156 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
159 uint8_t *p_in_y, *p_in_u, *p_in_v, *p_in_end_u;
160 uint8_t *p_out_y, *p_out_u, *p_out_v;
161 int i_simthres = var_GetInteger( p_filter, "colorthres-similaritythres" );
162 int i_satthres = var_GetInteger( p_filter, "colorthres-saturationthres" );
163 int i_color = var_GetInteger( p_filter, "colorthres-color" );
165 if( !p_pic ) return NULL;
167 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
170 msg_Warn( p_filter, "can't get output picture" );
171 if( p_pic->pf_release )
172 p_pic->pf_release( p_pic );
176 p_in_u = p_pic->p[U_PLANE].p_pixels;
177 p_in_v = p_pic->p[V_PLANE].p_pixels;
178 p_in_y = p_pic->p[Y_PLANE].p_pixels;
179 p_in_end_u = p_in_u + p_pic->p[U_PLANE].i_visible_lines
180 * p_pic->p[U_PLANE].i_pitch - 8;
182 p_out_y = p_outpic->p[Y_PLANE].p_pixels;
183 p_out_u = p_outpic->p[U_PLANE].p_pixels;
184 p_out_v = p_outpic->p[V_PLANE].p_pixels;
186 /* Create grayscale version of input */
187 vlc_memcpy( p_out_y, p_in_y, p_pic->p[Y_PLANE].i_visible_lines
188 * p_pic->p[Y_PLANE].i_pitch - 8 );
189 vlc_memset( p_out_u, 0x80, p_pic->p[U_PLANE].i_visible_lines
190 * p_pic->p[U_PLANE].i_pitch - 8 );
191 vlc_memset( p_out_v, 0x80, p_pic->p[U_PLANE].i_visible_lines
192 * p_pic->p[U_PLANE].i_pitch - 8 );
195 * Do the U and V planes
197 int i_red = ( i_color & 0xFF0000 ) >> 16;
198 int i_green = ( i_color & 0xFF00 ) >> 8;
199 int i_blue = i_color & 0xFF;
200 int i_u = (int8_t)(( -38 * i_red - 74 * i_green +
201 112 * i_blue + 128) >> 8) + 128;
202 int i_v = (int8_t)(( 112 * i_red - 94 * i_green -
203 18 * i_blue + 128) >> 8) + 128;
204 int refu = i_u - 0x80; /*bright red*/
205 int refv = i_v - 0x80;
206 int reflength = sqrt(refu*refu+refv*refv);
208 while( p_in_u < p_in_end_u ) {
209 /* Length of color vector */
210 int inu = (*p_in_u) - 0x80;
211 int inv = (*p_in_v) - 0x80;
212 int length = sqrt(inu*inu+inv*inv);
214 int diffu = refu * length - inu *reflength;
215 int diffv = refv * length - inv *reflength;
216 long long int difflen2=diffu*diffu;
217 difflen2 +=diffv*diffv;
218 long long int thres = length*reflength;
220 if( length > i_satthres && (difflen2*i_simthres< thres ) ) {
223 // fprintf(stderr,"keeping color %d %d\n", length, difflen2);
231 p_outpic->date = p_pic->date;
232 p_outpic->b_force = p_pic->b_force;
233 p_outpic->i_nb_fields = p_pic->i_nb_fields;
234 p_outpic->b_progressive = p_pic->b_progressive;
235 p_outpic->b_top_field_first = p_pic->b_top_field_first;
237 if( p_pic->pf_release )
238 p_pic->pf_release( p_pic );