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
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <errno.h>
  33 #include <math.h>
  34
  35 #include <vlc_common.h>
  36 #include <vlc_plugin.h>
  37 #include <vlc_sout.h>
  38 #include <vlc_vout.h>
  39
  40 #include "vlc_filter.h"
  41 #include "filter_picture.h"
  42
  43 /*****************************************************************************
  44  * Local prototypes
  45  *****************************************************************************/
  46 static int  Create    ( vlc_object_t * );
  47 static void Destroy   ( vlc_object_t * );
  48
  49 static picture_t *Filter( filter_t *, picture_t * );
  50
  51 /*****************************************************************************
  52  * Module descriptor
  53  *****************************************************************************/
  54 #define COLOR_TEXT N_("Color")
  55 #define COLOR_LONGTEXT N_("Colors similar to this will be kept, others will be "\
  56     "grayscaled. This must be an hexadecimal (like HTML colors). The first two "\
  57     "chars are for red, then green, then blue. #000000 = black, #FF0000 = red,"\
  58     " #00FF00 = green, #FFFF00 = yellow (red + green), #FFFFFF = white" )
  59 static const int pi_color_values[] = {
  60   0x00FF0000, 0x00FF00FF, 0x00FFFF00, 0x0000FF00, 0x000000FF, 0x0000FFFF };
  61
  62 static const char *const ppsz_color_descriptions[] = {
  63   N_("Red"), N_("Fuchsia"), N_("Yellow"), N_("Lime"), N_("Blue"), N_("Aqua") };
  64
  65 #define CFG_PREFIX "colorthres-"
  66
  67 vlc_module_begin();
  68     set_description( N_("Color threshold filter") );
  69     set_shortname( N_("Color threshold" ));
  70     set_category( CAT_VIDEO );
  71     set_subcategory( SUBCAT_VIDEO_VFILTER );
  72     set_capability( "video filter2", 0 );
  73     add_integer( CFG_PREFIX "color", 0x00FF0000, NULL, COLOR_TEXT,
  74                  COLOR_LONGTEXT, false );
  75         change_integer_list( pi_color_values, ppsz_color_descriptions, 0 );
  76     add_integer( CFG_PREFIX "saturationthres", 20, NULL,
  77                  _("Saturaton threshold"), "", false );
  78     add_integer( CFG_PREFIX "similaritythres", 15, NULL,
  79                  _("Similarity threshold"), "", false );
  80     set_callbacks( Create, Destroy );
  81 vlc_module_end();
  82
  83 static const char *const ppsz_filter_options[] = {
  84     "color", "saturationthes", "similaritythres", NULL
  85 };
  86
  87 /*****************************************************************************
  88  * filter_sys_t: adjust filter method descriptor
  89  *****************************************************************************/
  90 struct filter_sys_t
  91 {
  92 };
  93
  94 /*****************************************************************************
  95  * Create: allocates adjust video thread output method
  96  *****************************************************************************
  97  * This function allocates and initializes a adjust vout method.
  98  *****************************************************************************/
  99 static int Create( vlc_object_t *p_this )
 100 {
 101     filter_t *p_filter = (filter_t *)p_this;
 102
 103     switch( p_filter->fmt_in.video.i_chroma )
 104     {
 105         CASE_PLANAR_YUV
 106             break;
 107
 108         default:
 109             msg_Err( p_filter, "Unsupported input chroma (%4s)",
 110                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 111             return VLC_EGENERIC;
 112     }
 113
 114     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 115     {
 116         msg_Err( p_filter, "Input and output chromas don't match" );
 117         return VLC_EGENERIC;
 118     }
 119
 120     config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
 121                        p_filter->p_cfg );
 122     var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "color" );
 123     var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "similaritythres" );
 124     var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "saturationthres" );
 125
 126     /* Allocate structure */
 127     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 128     if( p_filter->p_sys == NULL )
 129         return VLC_ENOMEM;
 130
 131     p_filter->pf_video_filter = Filter;
 132
 133     return VLC_SUCCESS;
 134 }
 135
 136 /*****************************************************************************
 137  * Destroy: destroy adjust video thread output method
 138  *****************************************************************************
 139  * Terminate an output method created by adjustCreateOutputMethod
 140  *****************************************************************************/
 141 static void Destroy( vlc_object_t *p_this )
 142 {
 143     filter_t *p_filter = (filter_t *)p_this;
 144     free( p_filter->p_sys );
 145 }
 146
 147 /*****************************************************************************
 148  * Render: displays previously rendered output
 149  *****************************************************************************
 150  * This function send the currently rendered image to adjust modified image,
 151  * waits until it is displayed and switch the two rendering buffers, preparing
 152  * next frame.
 153  *****************************************************************************/
 154 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 155 {
 156     picture_t *p_outpic;
 157     uint8_t *p_in_y, *p_in_u, *p_in_v, *p_in_end_u;
 158     uint8_t *p_out_y, *p_out_u, *p_out_v;
 159     int i_simthres = var_GetInteger( p_filter, "colorthres-similaritythres" );
 160     int i_satthres = var_GetInteger( p_filter, "colorthres-saturationthres" );
 161     int i_color = var_GetInteger( p_filter, "colorthres-color" );
 162
 163     if( !p_pic ) return NULL;
 164
 165     p_outpic = filter_NewPicture( p_filter );
 166     if( !p_outpic )
 167     {
 168         picture_Release( p_pic );
 169         return NULL;
 170     }
 171
 172     p_in_u = p_pic->p[U_PLANE].p_pixels;
 173     p_in_v = p_pic->p[V_PLANE].p_pixels;
 174     p_in_y = p_pic->p[Y_PLANE].p_pixels;
 175     p_in_end_u = p_in_u + p_pic->p[U_PLANE].i_visible_lines
 176                         * p_pic->p[U_PLANE].i_pitch - 8;
 177
 178     p_out_y = p_outpic->p[Y_PLANE].p_pixels;
 179     p_out_u = p_outpic->p[U_PLANE].p_pixels;
 180     p_out_v = p_outpic->p[V_PLANE].p_pixels;
 181
 182     /* Create grayscale version of input */
 183     vlc_memcpy( p_out_y, p_in_y, p_pic->p[Y_PLANE].i_visible_lines
 184                * p_pic->p[Y_PLANE].i_pitch - 8 );
 185     vlc_memset( p_out_u, 0x80, p_pic->p[U_PLANE].i_visible_lines
 186                * p_pic->p[U_PLANE].i_pitch - 8 );
 187     vlc_memset( p_out_v, 0x80, p_pic->p[U_PLANE].i_visible_lines
 188                * p_pic->p[U_PLANE].i_pitch - 8 );
 189
 190     /*
 191      * Do the U and V planes
 192      */
 193     int i_red = ( i_color & 0xFF0000 ) >> 16;
 194     int i_green = ( i_color & 0xFF00 ) >> 8;
 195     int i_blue = i_color & 0xFF;
 196     int i_u = (int8_t)(( -38 * i_red - 74 * i_green +
 197                      112 * i_blue + 128) >> 8) + 128;
 198     int i_v = (int8_t)(( 112 * i_red  -  94 * i_green -
 199                       18 * i_blue + 128) >> 8) + 128;
 200     int refu = i_u - 0x80;         /*bright red*/
 201     int refv = i_v - 0x80;
 202     int reflength = sqrt(refu*refu+refv*refv);
 203
 204     while( p_in_u < p_in_end_u ) {
 205         /* Length of color vector */
 206         int inu = (*p_in_u) - 0x80;
 207         int inv = (*p_in_v) - 0x80;
 208         int length = sqrt(inu*inu+inv*inv);
 209
 210         int diffu = refu * length - inu *reflength;
 211         int diffv = refv * length - inv *reflength;
 212         long long int difflen2=diffu*diffu;
 213         difflen2 +=diffv*diffv;
 214         long long int thres = length*reflength;
 215         thres *= thres;
 216         if( length > i_satthres && (difflen2*i_simthres< thres ) ) {
 217             *p_out_u = *p_in_u;
 218             *p_out_v = *p_in_v;
 219 //        fprintf(stderr,"keeping color %d %d\n", length, difflen2);
 220         }
 221         p_in_u++;
 222         p_in_v++;
 223         p_out_u++;
 224         p_out_v++;
 225     }
 226
 227     return CopyInfoAndRelease( p_outpic, p_pic );
 228 }