git.sesse.net Git - vlc/blob - modules/video_filter/colorthres.c

   1 /*****************************************************************************
   2  * colorthres.c: Theshold color based on similarity to reference color
   3  *****************************************************************************
   4  * Copyright (C) 2000-2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sigmund Augdal <dnumgis@videolan.org>
   8  *
   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.
  13  *
  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.
  18  *
  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  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <errno.h>
  28 #include <math.h>
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_sout.h>
  37 #include <vlc_vout.h>
  38
  39 #include "vlc_filter.h"
  40 #include "filter_picture.h"
  41
  42 /*****************************************************************************
  43  * Local prototypes
  44  *****************************************************************************/
  45 static int  Create    ( vlc_object_t * );
  46 static void Destroy   ( vlc_object_t * );
  47
  48 static picture_t *Filter( filter_t *, picture_t * );
  49
  50 /*****************************************************************************
  51  * Module descriptor
  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 };
  60
  61 static const char *const ppsz_color_descriptions[] = {
  62   N_("Red"), N_("Fuchsia"), N_("Yellow"), N_("Lime"), N_("Blue"), N_("Aqua") };
  63
  64 #define CFG_PREFIX "colorthres-"
  65
  66 vlc_module_begin();
  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 );
  80 vlc_module_end();
  81
  82 static const char *const ppsz_filter_options[] = {
  83     "color", "saturationthes", "similaritythres", NULL
  84 };
  85
  86 /*****************************************************************************
  87  * filter_sys_t: adjust filter method descriptor
  88  *****************************************************************************/
  89 struct filter_sys_t
  90 {
  91 };
  92
  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 )
  99 {
 100     filter_t *p_filter = (filter_t *)p_this;
 101
 102     switch( p_filter->fmt_in.video.i_chroma )
 103     {
 104         CASE_PLANAR_YUV
 105             break;
 106
 107         default:
 108             msg_Err( p_filter, "Unsupported input chroma (%4s)",
 109                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 110             return VLC_EGENERIC;
 111     }
 112
 113     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 114     {
 115         msg_Err( p_filter, "Input and output chromas don't match" );
 116         return VLC_EGENERIC;
 117     }
 118
 119     config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
 120                        p_filter->p_cfg );
 121     var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "color" );
 122     var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "similaritythres" );
 123     var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "saturationthres" );
 124
 125     /* Allocate structure */
 126     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 127     if( p_filter->p_sys == NULL )
 128         return VLC_ENOMEM;
 129
 130     p_filter->pf_video_filter = Filter;
 131
 132     return VLC_SUCCESS;
 133 }
 134
 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 )
 141 {
 142     filter_t *p_filter = (filter_t *)p_this;
 143     free( p_filter->p_sys );
 144 }
 145
 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
 151  * next frame.
 152  *****************************************************************************/
 153 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 154 {
 155     picture_t *p_outpic;
 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" );
 161
 162     if( !p_pic ) return NULL;
 163
 164     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 165     if( !p_outpic )
 166     {
 167         msg_Warn( p_filter, "can't get output picture" );
 168         if( p_pic->pf_release )
 169             p_pic->pf_release( p_pic );
 170         return NULL;
 171     }
 172
 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;
 178
 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;
 182
 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 );
 190
 191     /*
 192      * Do the U and V planes
 193      */
 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);
 204
 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);
 210
 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;
 216         thres *= thres;
 217         if( length > i_satthres && (difflen2*i_simthres< thres ) ) {
 218             *p_out_u = *p_in_u;
 219             *p_out_v = *p_in_v;
 220 //        fprintf(stderr,"keeping color %d %d\n", length, difflen2);
 221         }
 222         p_in_u++;
 223         p_in_v++;
 224         p_out_u++;
 225         p_out_v++;
 226     }
 227
 228     return CopyInfoAndRelease( p_outpic, p_pic );
 229 }