mirror of
https://code.videolan.org/videolan/vlc
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233 lines
8.7 KiB
C
233 lines
8.7 KiB
C
/*****************************************************************************
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* colorthres.c: Theshold color based on similarity to reference color
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*****************************************************************************
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* Copyright (C) 2000-2006 the VideoLAN team
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* $Id$
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*
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* Authors: Sigmund Augdal <dnumgis@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <errno.h>
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#include <math.h>
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_sout.h>
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#include <vlc_vout.h>
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#include "vlc_filter.h"
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#include "filter_picture.h"
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Create ( vlc_object_t * );
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static void Destroy ( vlc_object_t * );
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static picture_t *Filter( filter_t *, picture_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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#define COLOR_TEXT N_("Color")
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#define COLOR_LONGTEXT N_("Colors similar to this will be kept, others will be "\
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"grayscaled. This must be an hexadecimal (like HTML colors). The first two "\
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"chars are for red, then green, then blue. #000000 = black, #FF0000 = red,"\
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" #00FF00 = green, #FFFF00 = yellow (red + green), #FFFFFF = white" )
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static const int pi_color_values[] = {
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0x00FF0000, 0x00FF00FF, 0x00FFFF00, 0x0000FF00, 0x000000FF, 0x0000FFFF };
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static const char *const ppsz_color_descriptions[] = {
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N_("Red"), N_("Fuchsia"), N_("Yellow"), N_("Lime"), N_("Blue"), N_("Aqua") };
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#define CFG_PREFIX "colorthres-"
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vlc_module_begin();
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set_description( N_("Color threshold filter") );
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set_shortname( N_("Color threshold" ));
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set_category( CAT_VIDEO );
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set_subcategory( SUBCAT_VIDEO_VFILTER );
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set_capability( "video filter2", 0 );
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add_integer( CFG_PREFIX "color", 0x00FF0000, NULL, COLOR_TEXT,
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COLOR_LONGTEXT, false );
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change_integer_list( pi_color_values, ppsz_color_descriptions, 0 );
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add_integer( CFG_PREFIX "saturationthres", 20, NULL,
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_("Saturaton threshold"), "", false );
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add_integer( CFG_PREFIX "similaritythres", 15, NULL,
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_("Similarity threshold"), "", false );
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set_callbacks( Create, Destroy );
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vlc_module_end();
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static const char *const ppsz_filter_options[] = {
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"color", "saturationthes", "similaritythres", NULL
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};
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/*****************************************************************************
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* filter_sys_t: adjust filter method descriptor
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*****************************************************************************/
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struct filter_sys_t
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{
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};
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/*****************************************************************************
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* Create: allocates adjust video thread output method
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*****************************************************************************
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* This function allocates and initializes a adjust vout method.
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*****************************************************************************/
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static int Create( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t *)p_this;
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switch( p_filter->fmt_in.video.i_chroma )
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{
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CASE_PLANAR_YUV
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break;
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default:
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msg_Err( p_filter, "Unsupported input chroma (%4s)",
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(char*)&(p_filter->fmt_in.video.i_chroma) );
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return VLC_EGENERIC;
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}
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if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
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{
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msg_Err( p_filter, "Input and output chromas don't match" );
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return VLC_EGENERIC;
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}
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config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
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p_filter->p_cfg );
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var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "color" );
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var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "similaritythres" );
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var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "saturationthres" );
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/* Allocate structure */
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p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
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if( p_filter->p_sys == NULL )
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{
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msg_Err( p_filter, "out of memory" );
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return VLC_ENOMEM;
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}
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p_filter->pf_video_filter = Filter;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Destroy: destroy adjust video thread output method
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*****************************************************************************
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* Terminate an output method created by adjustCreateOutputMethod
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*****************************************************************************/
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static void Destroy( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t *)p_this;
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free( p_filter->p_sys );
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}
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/*****************************************************************************
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* Render: displays previously rendered output
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*****************************************************************************
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* This function send the currently rendered image to adjust modified image,
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* waits until it is displayed and switch the two rendering buffers, preparing
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* next frame.
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*****************************************************************************/
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static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
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{
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picture_t *p_outpic;
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uint8_t *p_in_y, *p_in_u, *p_in_v, *p_in_end_u;
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uint8_t *p_out_y, *p_out_u, *p_out_v;
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int i_simthres = var_GetInteger( p_filter, "colorthres-similaritythres" );
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int i_satthres = var_GetInteger( p_filter, "colorthres-saturationthres" );
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int i_color = var_GetInteger( p_filter, "colorthres-color" );
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if( !p_pic ) return NULL;
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p_outpic = p_filter->pf_vout_buffer_new( p_filter );
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if( !p_outpic )
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{
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msg_Warn( p_filter, "can't get output picture" );
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if( p_pic->pf_release )
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p_pic->pf_release( p_pic );
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return NULL;
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}
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p_in_u = p_pic->p[U_PLANE].p_pixels;
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p_in_v = p_pic->p[V_PLANE].p_pixels;
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p_in_y = p_pic->p[Y_PLANE].p_pixels;
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p_in_end_u = p_in_u + p_pic->p[U_PLANE].i_visible_lines
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* p_pic->p[U_PLANE].i_pitch - 8;
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p_out_y = p_outpic->p[Y_PLANE].p_pixels;
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p_out_u = p_outpic->p[U_PLANE].p_pixels;
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p_out_v = p_outpic->p[V_PLANE].p_pixels;
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/* Create grayscale version of input */
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vlc_memcpy( p_out_y, p_in_y, p_pic->p[Y_PLANE].i_visible_lines
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* p_pic->p[Y_PLANE].i_pitch - 8 );
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vlc_memset( p_out_u, 0x80, p_pic->p[U_PLANE].i_visible_lines
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* p_pic->p[U_PLANE].i_pitch - 8 );
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vlc_memset( p_out_v, 0x80, p_pic->p[U_PLANE].i_visible_lines
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* p_pic->p[U_PLANE].i_pitch - 8 );
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/*
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* Do the U and V planes
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*/
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int i_red = ( i_color & 0xFF0000 ) >> 16;
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int i_green = ( i_color & 0xFF00 ) >> 8;
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int i_blue = i_color & 0xFF;
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int i_u = (int8_t)(( -38 * i_red - 74 * i_green +
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112 * i_blue + 128) >> 8) + 128;
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int i_v = (int8_t)(( 112 * i_red - 94 * i_green -
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18 * i_blue + 128) >> 8) + 128;
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int refu = i_u - 0x80; /*bright red*/
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int refv = i_v - 0x80;
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int reflength = sqrt(refu*refu+refv*refv);
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while( p_in_u < p_in_end_u ) {
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/* Length of color vector */
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int inu = (*p_in_u) - 0x80;
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int inv = (*p_in_v) - 0x80;
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int length = sqrt(inu*inu+inv*inv);
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int diffu = refu * length - inu *reflength;
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int diffv = refv * length - inv *reflength;
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long long int difflen2=diffu*diffu;
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difflen2 +=diffv*diffv;
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long long int thres = length*reflength;
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thres *= thres;
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if( length > i_satthres && (difflen2*i_simthres< thres ) ) {
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*p_out_u = *p_in_u;
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*p_out_v = *p_in_v;
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// fprintf(stderr,"keeping color %d %d\n", length, difflen2);
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}
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p_in_u++;
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p_in_v++;
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p_out_u++;
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p_out_v++;
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}
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return CopyInfoAndRelease( p_outpic, p_pic );
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}
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