mirror of https://code.videolan.org/videolan/vlc
332 lines
12 KiB
C
332 lines
12 KiB
C
/*****************************************************************************
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* colorthres.c: Threshold color based on similarity to reference color
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*****************************************************************************
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* Copyright (C) 2000-2009 VLC authors and VideoLAN
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*
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* Authors: Sigmund Augdal <dnumgis@videolan.org>
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* Antoine Cellerier <dionoea at videolan dot org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* 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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <math.h>
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#include <stdatomic.h>
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#include <vlc_common.h>
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#include <vlc_configuration.h>
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#include <vlc_plugin.h>
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#include <vlc_sout.h>
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#include <vlc_filter.h>
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#include <vlc_picture.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 ( filter_t * );
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static picture_t *FilterPacked( filter_t *, picture_t * );
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VIDEO_FILTER_WRAPPER_CLOSE( Filter, Destroy )
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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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#define COLOR_HELP N_("Select one color in the video")
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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_help(COLOR_HELP)
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set_subcategory( SUBCAT_VIDEO_VFILTER )
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add_rgb(CFG_PREFIX "color", 0x00FF0000, COLOR_TEXT, COLOR_LONGTEXT)
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change_integer_list( pi_color_values, ppsz_color_descriptions )
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add_integer( CFG_PREFIX "saturationthres", 20,
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N_("Saturation threshold"), "" )
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add_integer( CFG_PREFIX "similaritythres", 15,
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N_("Similarity threshold"), "" )
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set_callback_video_filter( Create )
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vlc_module_end ()
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static const char *const ppsz_filter_options[] = {
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"color", "saturationthres", "similaritythres", NULL
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};
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/*****************************************************************************
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* callback prototypes
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*****************************************************************************/
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static int FilterCallback( vlc_object_t *, char const *,
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vlc_value_t, vlc_value_t, void * );
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/*****************************************************************************
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* filter_sys_t: adjust filter method descriptor
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*****************************************************************************/
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typedef struct
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{
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atomic_int i_simthres;
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atomic_int i_satthres;
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atomic_int i_color;
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} filter_sys_t;
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static const struct vlc_filter_operations packed_filter_ops =
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{
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.filter_video = FilterPacked, .close = Destroy,
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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( filter_t *p_filter )
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{
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filter_sys_t *p_sys;
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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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p_filter->ops = &Filter_ops;
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break;
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CASE_PACKED_YUV_422
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p_filter->ops = &packed_filter_ops;
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break;
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default:
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msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
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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( !video_format_IsSameChroma( &p_filter->fmt_in.video,
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&p_filter->fmt_out.video ) )
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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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/* Allocate structure */
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p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
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if( p_filter->p_sys == NULL )
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return VLC_ENOMEM;
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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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atomic_init( &p_sys->i_color,
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var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "color" ) );
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atomic_init( &p_sys->i_simthres,
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var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "similaritythres" ) );
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atomic_init( &p_sys->i_satthres,
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var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "saturationthres" ) );
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var_AddCallback( p_filter, CFG_PREFIX "color", FilterCallback, p_sys );
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var_AddCallback( p_filter, CFG_PREFIX "similaritythres", FilterCallback, p_sys );
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var_AddCallback( p_filter, CFG_PREFIX "saturationthres", FilterCallback, p_sys );
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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( filter_t *p_this )
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{
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filter_t *p_filter = (filter_t *)p_this;
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filter_sys_t *p_sys = p_filter->p_sys;
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var_DelCallback( p_filter, CFG_PREFIX "color", FilterCallback, p_sys );
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var_DelCallback( p_filter, CFG_PREFIX "similaritythres", FilterCallback, p_sys );
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var_DelCallback( p_filter, CFG_PREFIX "saturationthres", FilterCallback, p_sys );
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free( p_sys );
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}
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static void GetReference( int *refu, int *refv, int *reflength,
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uint32_t i_color )
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{
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int i_red = ( i_color & 0xFF0000 ) >> 16;
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int i_green = ( i_color & 0x00FF00 ) >> 8;
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int i_blue = ( i_color & 0x0000FF );
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int i_u = (int8_t)(( -38 * i_red - 74 * i_green + 112 * i_blue + 128) >> 8) + 128;
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int i_v = (int8_t)(( 112 * i_red - 94 * i_green - 18 * i_blue + 128) >> 8) + 128;
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*refu = i_u - 0x80;
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*refv = i_v - 0x80;
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*reflength = sqrt(*refu * *refu + *refv * *refv);
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}
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static bool IsSimilar( int u, int v,
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int refu, int refv, int reflength,
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int i_satthres, int i_simthres )
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{
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int length = sqrt(u * u + v * v);
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int diffu = refu * length - u * reflength;
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int diffv = refv * length - v * reflength;
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int64_t difflen2 = diffu * diffu + diffv * diffv;
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int64_t thres = length * reflength;
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thres *= thres;
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return length > i_satthres && (difflen2 * i_simthres < thres);
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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 void Filter( filter_t *p_filter, picture_t *p_pic, picture_t *p_outpic )
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{
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filter_sys_t *p_sys = p_filter->p_sys;
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int i_simthres = atomic_load( &p_sys->i_simthres );
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int i_satthres = atomic_load( &p_sys->i_satthres );
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int i_color = atomic_load( &p_sys->i_color );
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/* Copy the Y plane */
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plane_CopyPixels( &p_outpic->p[Y_PLANE], &p_pic->p[Y_PLANE] );
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/*
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* Do the U and V planes
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*/
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int refu, refv, reflength;
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GetReference( &refu, &refv, &reflength, i_color );
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for( int y = 0; y < p_pic->p[U_PLANE].i_visible_lines; y++ )
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{
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uint8_t *p_src_u = &p_pic->p[U_PLANE].p_pixels[y * p_pic->p[U_PLANE].i_pitch];
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uint8_t *p_src_v = &p_pic->p[V_PLANE].p_pixels[y * p_pic->p[V_PLANE].i_pitch];
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uint8_t *p_dst_u = &p_outpic->p[U_PLANE].p_pixels[y * p_outpic->p[U_PLANE].i_pitch];
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uint8_t *p_dst_v = &p_outpic->p[V_PLANE].p_pixels[y * p_outpic->p[V_PLANE].i_pitch];
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for( int x = 0; x < p_pic->p[U_PLANE].i_visible_pitch; x++ )
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{
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if( IsSimilar( *p_src_u - 0x80, *p_src_v - 0x80,
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refu, refv, reflength,
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i_satthres, i_simthres ) )
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{
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*p_dst_u++ = *p_src_u;
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*p_dst_v++ = *p_src_v;
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}
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else
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{
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*p_dst_u++ = 0x80;
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*p_dst_v++ = 0x80;
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}
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p_src_u++;
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p_src_v++;
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}
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}
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}
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static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_pic )
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{
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picture_t *p_outpic;
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filter_sys_t *p_sys = p_filter->p_sys;
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int i_simthres = atomic_load( &p_sys->i_simthres );
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int i_satthres = atomic_load( &p_sys->i_satthres );
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int i_color = atomic_load( &p_sys->i_color );
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if( !p_pic ) return NULL;
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p_outpic = filter_NewPicture( p_filter );
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if( !p_outpic )
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{
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picture_Release( p_pic );
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return NULL;
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}
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int i_y_offset, i_u_offset, i_v_offset;
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int i_ret = GetPackedYuvOffsets( p_filter->fmt_in.video.i_chroma,
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&i_y_offset, &i_u_offset, &i_v_offset );
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if( i_ret == VLC_EGENERIC )
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{
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picture_Release( p_pic );
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return NULL;
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}
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/*
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* Copy Y and do the U and V planes
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*/
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int refu, refv, reflength;
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GetReference( &refu, &refv, &reflength, i_color );
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for( int y = 0; y < p_pic->p->i_visible_lines; y++ )
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{
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uint8_t *p_src = &p_pic->p->p_pixels[y * p_pic->p->i_pitch];
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uint8_t *p_dst = &p_outpic->p->p_pixels[y * p_outpic->p->i_pitch];
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for( int x = 0; x < p_pic->p->i_visible_pitch / 4; x++ )
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{
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p_dst[i_y_offset + 0] = p_src[i_y_offset + 0];
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p_dst[i_y_offset + 2] = p_src[i_y_offset + 2];
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if( IsSimilar( p_src[i_u_offset] - 0x80, p_src[i_v_offset] - 0x80,
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refu, refv, reflength,
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i_satthres, i_simthres ) )
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{
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p_dst[i_u_offset] = p_src[i_u_offset];
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p_dst[i_v_offset] = p_src[i_v_offset];
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}
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else
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{
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p_dst[i_u_offset] = 0x80;
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p_dst[i_v_offset] = 0x80;
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}
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p_dst += 4;
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p_src += 4;
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}
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}
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return CopyInfoAndRelease( p_outpic, p_pic );
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}
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static int FilterCallback ( vlc_object_t *p_this, char const *psz_var,
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vlc_value_t oldval, vlc_value_t newval, void *p_data )
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{
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filter_sys_t *p_sys = p_data;
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if( !strcmp( psz_var, CFG_PREFIX "color" ) )
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atomic_store( &p_sys->i_color, newval.i_int );
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else if( !strcmp( psz_var, CFG_PREFIX "similaritythres" ) )
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atomic_store( &p_sys->i_simthres, newval.i_int );
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else /* CFG_PREFIX "saturationthres" */
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atomic_store( &p_sys->i_satthres, newval.i_int );
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(void)p_this; (void)oldval;
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return VLC_SUCCESS;
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}
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