mirror of
https://code.videolan.org/videolan/vlc
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262 lines
9.2 KiB
C
262 lines
9.2 KiB
C
/*****************************************************************************
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* sharpen.c: Sharpen video filter
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*****************************************************************************
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* Copyright (C) 2003-2007 the VideoLAN team
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* $Id$
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*
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* Author: Jérémy DEMEULE <dj_mulder at djduron dot no-ip dot org>
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* Jean-Baptiste Kempf <jb at videolan dot 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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/* The sharpen filter. */
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/*
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* static int filter[] = { -1, -1, -1,
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* -1, 8, -1,
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* -1, -1, -1 };
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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 <vlc/vlc.h>
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#include <vlc_vout.h>
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#include "vlc_filter.h"
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#define SIG_TEXT N_("Sharpen strength (0-2)")
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#define SIG_LONGTEXT N_("Set the Sharpen strength, between 0 and 2. Defaults to 0.05.")
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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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static int SharpenCallback( vlc_object_t *, char const *,
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vlc_value_t, vlc_value_t, void * );
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#define FILTER_PREFIX "sharpen-"
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("Augment contrast between contours.") );
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set_shortname( _("Sharpen video filter") );
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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_float_with_range( "sharpen-sigma", 0.05, 0.0, 2.0, NULL,
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SIG_TEXT, SIG_LONGTEXT, false );
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add_shortcut( "sharpen" );
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set_callbacks( Create, Destroy );
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vlc_module_end();
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static const char *ppsz_filter_options[] = {
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"sigma", NULL
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};
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/*****************************************************************************
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* filter_sys_t: Sharpen video filter descriptor
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*****************************************************************************
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* This structure is part of the video output thread descriptor.
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* It describes the Sharpen specific properties of an output thread.
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*****************************************************************************/
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struct filter_sys_t
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{
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float f_sigma;
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int tab_precalc[512];
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};
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/*****************************************************************************
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* clip: avoid negative value and value > 255
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*****************************************************************************/
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inline static int32_t clip( int32_t a )
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{
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return (a > 255) ? 255 : (a < 0) ? 0 : a;
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}
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static void init_precalc_table(filter_sys_t *p_filter)
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{
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float sigma = p_filter->f_sigma;
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for(int i = 0; i < 512; ++i)
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{
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p_filter->tab_precalc[i] = (i - 256) * sigma;
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}
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}
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/*****************************************************************************
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* Create: allocates Sharpen video thread output method
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*****************************************************************************
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* This function allocates and initializes a Sharpen 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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/* 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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config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
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p_filter->p_cfg );
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p_filter->p_sys->f_sigma =
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var_CreateGetFloatCommand( p_filter, FILTER_PREFIX "sigma" );
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var_AddCallback( p_filter, FILTER_PREFIX "sigma",
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SharpenCallback, p_filter->p_sys );
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init_precalc_table(p_filter->p_sys);
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Destroy: destroy Sharpen video thread output method
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*****************************************************************************
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* Terminate an output method created by SharpenCreateOutputMethod
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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 Invert image, waits
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* until it is displayed and switch the two rendering buffers, preparing next
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* 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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int i, j;
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uint8_t *p_src = NULL;
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uint8_t *p_out = NULL;
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int i_src_pitch;
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int pix;
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const int v1 = -1;
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const int v2 = 3; /* 2^3 = 8 */
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if( !p_pic ) return NULL;
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if( !p_filter ) return NULL;
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if( !p_filter->p_sys ) 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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/* process the Y plane */
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p_src = p_pic->p[Y_PLANE].p_pixels;
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p_out = p_outpic->p[Y_PLANE].p_pixels;
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if( !p_src || !p_out )
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{
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msg_Warn( p_filter, "can't get Y plane" );
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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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i_src_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
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/* perform convolution only on Y plane. Avoid border line. */
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for( i = 0; i < p_pic->p[Y_PLANE].i_visible_lines; i++ )
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{
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if( (i == 0) || (i == p_pic->p[Y_PLANE].i_visible_lines - 1) )
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{
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for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
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p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] );
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continue ;
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}
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for( j = 0; j < p_pic->p[Y_PLANE].i_visible_pitch; j++ )
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{
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if( (j == 0) || (j == p_pic->p[Y_PLANE].i_visible_pitch - 1) )
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{
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p_out[i * i_src_pitch + j] = p_src[i * i_src_pitch + j];
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continue ;
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}
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pix = (p_src[(i - 1) * i_src_pitch + j - 1] * v1) +
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(p_src[(i - 1) * i_src_pitch + j ] * v1) +
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(p_src[(i - 1) * i_src_pitch + j + 1] * v1) +
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(p_src[(i ) * i_src_pitch + j - 1] * v1) +
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(p_src[(i ) * i_src_pitch + j ] << v2) +
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(p_src[(i ) * i_src_pitch + j + 1] * v1) +
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(p_src[(i + 1) * i_src_pitch + j - 1] * v1) +
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(p_src[(i + 1) * i_src_pitch + j ] * v1) +
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(p_src[(i + 1) * i_src_pitch + j + 1] * v1);
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pix = pix >= 0 ? clip(pix) : -clip(pix * -1);
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p_out[i * i_src_pitch + j] = clip( p_src[i * i_src_pitch + j] +
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p_filter->p_sys->tab_precalc[pix + 256] );
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}
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}
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vlc_memcpy( p_outpic->p[U_PLANE].p_pixels, p_pic->p[U_PLANE].p_pixels,
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p_outpic->p[U_PLANE].i_lines * p_outpic->p[U_PLANE].i_pitch );
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vlc_memcpy( p_outpic->p[V_PLANE].p_pixels, p_pic->p[V_PLANE].p_pixels,
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p_outpic->p[V_PLANE].i_lines * p_outpic->p[V_PLANE].i_pitch );
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p_outpic->date = p_pic->date;
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p_outpic->b_force = p_pic->b_force;
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p_outpic->i_nb_fields = p_pic->i_nb_fields;
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p_outpic->b_progressive = p_pic->b_progressive;
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p_outpic->b_top_field_first = p_pic->b_top_field_first;
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if( p_pic->pf_release )
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p_pic->pf_release( p_pic );
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return p_outpic;
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}
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static int SharpenCallback( vlc_object_t *p_this, char const *psz_var,
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vlc_value_t oldval, vlc_value_t newval,
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void *p_data )
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{
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VLC_UNUSED(p_this); VLC_UNUSED(oldval);
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filter_sys_t *p_sys = (filter_sys_t *)p_data;
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if( !strcmp( psz_var, FILTER_PREFIX "sigma" ) )
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p_sys->f_sigma = __MIN( 2., __MAX( 0., newval.f_float ) );
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init_precalc_table(p_sys);
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return VLC_SUCCESS;
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}
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