mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-04 09:11:33 +02:00
391 lines
12 KiB
C
391 lines
12 KiB
C
/*****************************************************************************
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* gaussianblur.c : gaussian blur video filter
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*****************************************************************************
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* Copyright (C) 2000-2007 the VideoLAN team
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* $Id$
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*
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* Authors: 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
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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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#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_plugin.h>
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#include <vlc_vout.h>
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#include "vlc_filter.h"
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#include <math.h> /* exp(), sqrt() */
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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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#define SIGMA_TEXT N_("Gaussian's std deviation")
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#define SIGMA_LONGTEXT N_( \
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"Gaussian's standard deviation. The bluring will take " \
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"into account pixels up to 3*sigma away in any direction.")
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#define FILTER_PREFIX "gaussianblur-"
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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( _("Gaussian blur video filter") );
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set_shortname( _( "Gaussian Blur" ));
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set_capability( "video filter2", 0 );
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set_category( CAT_VIDEO );
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set_subcategory( SUBCAT_VIDEO_VFILTER );
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add_float( FILTER_PREFIX "sigma", 2., NULL, SIGMA_TEXT, SIGMA_LONGTEXT,
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false );
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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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/* Comment this to use floats instead of integers (faster for bigger sigma
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* values)
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* For sigma = 2 ints are faster
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* For sigma = 4 floats are faster
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*/
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#define DONT_USE_FLOATS
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struct filter_sys_t
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{
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double f_sigma;
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int i_dim;
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#ifdef DONT_USE_FLOATS
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int *pi_distribution;
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int *pi_buffer;
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int *pi_scale;
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#else
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float *pf_distribution;
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float *pf_buffer;
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float *pf_scale;
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#endif
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};
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static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
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{
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double f_sigma = p_sys->f_sigma;
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int i_dim = (int)(3.*f_sigma);
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#ifdef DONT_USE_FLOATS
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int *pi_distribution = (int*)malloc( (2*i_dim+1) * sizeof( int ) );
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#else
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float *pf_distribution = (float*)malloc( (2*i_dim+1) * sizeof( float ) );
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#endif
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int x;
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for( x = -i_dim; x <= i_dim; x++ )
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{
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#ifdef DONT_USE_FLOATS
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pi_distribution[i_dim+x] =
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(int)( sqrt( exp(-(x*x)/(f_sigma*f_sigma) )
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/ (2.*M_PI*f_sigma*f_sigma) ) * (double)(1<<8) );
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printf("%d\n",pi_distribution[i_dim+x]);
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#else
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pf_distribution[i_dim+x] = (float)
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sqrt( exp(-(x*x)/(f_sigma*f_sigma) ) / (2.*M_PI*f_sigma*f_sigma) );
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printf("%f\n",pf_distribution[i_dim+x]);
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#endif
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}
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p_sys->i_dim = i_dim;
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#ifdef DONT_USE_FLOATS
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p_sys->pi_distribution = pi_distribution;
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#else
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p_sys->pf_distribution = pf_distribution;
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#endif
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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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if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
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&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
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&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
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&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
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&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
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&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
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)
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{
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/* We only want planar YUV 4:2:0 or 4:2:2 */
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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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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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config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
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p_filter->p_cfg );
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p_filter->pf_video_filter = Filter;
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p_filter->p_sys->f_sigma =
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var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
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if( p_filter->p_sys->f_sigma <= 0. )
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{
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msg_Err( p_filter, "sigma must be positive" );
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return VLC_EGENERIC;
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}
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gaussianblur_InitDistribution( p_filter->p_sys );
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msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
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p_filter->p_sys->i_dim*2+1 );
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#ifdef DONT_USE_FLOATS
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p_filter->p_sys->pi_buffer = NULL;
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p_filter->p_sys->pi_scale = NULL;
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#else
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p_filter->p_sys->pf_buffer = NULL;
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p_filter->p_sys->pf_scale = NULL;
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#endif
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return VLC_SUCCESS;
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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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#ifdef DONT_USE_FLOATS
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free( p_filter->p_sys->pi_distribution );
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free( p_filter->p_sys->pi_buffer );
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free( p_filter->p_sys->pi_scale );
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#else
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free( p_filter->p_sys->pf_distribution );
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free( p_filter->p_sys->pf_buffer );
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free( p_filter->p_sys->pf_scale );
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#endif
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free( p_filter->p_sys );
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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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filter_sys_t *p_sys = p_filter->p_sys;
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int i_plane;
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const int i_dim = p_sys->i_dim;
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#ifdef DONT_USE_FLOATS
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int *pi_buffer;
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int *pi_scale;
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const int *pi_distribution = p_sys->pi_distribution;
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#else
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float *pf_buffer;
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float *pf_scale;
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const float *pf_distribution = p_sys->pf_distribution;
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#endif
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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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#ifdef DONT_USE_FLOATS
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if( !p_sys->pi_buffer )
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{
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p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
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p_pic->p[Y_PLANE].i_visible_lines
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* p_pic->p[Y_PLANE].i_pitch
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* sizeof( int ) );
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}
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pi_buffer = p_sys->pi_buffer;
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#else
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if( !p_sys->pf_buffer )
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{
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p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
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p_pic->p[Y_PLANE].i_visible_lines
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* p_pic->p[Y_PLANE].i_pitch
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* sizeof( float ) );
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}
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pf_buffer = p_sys->pf_buffer;
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#endif
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#ifdef DONT_USE_FLOATS
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if( !p_sys->pi_scale )
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#else
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if( !p_sys->pf_scale )
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#endif
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{
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const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
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const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
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const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
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int i_col, i_line;
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#ifdef DONT_USE_FLOATS
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p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
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* sizeof( int ) );
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pi_scale = p_sys->pi_scale;
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#else
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p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
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* sizeof( float ) );
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pf_scale = p_sys->pf_scale;
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#endif
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for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
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{
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for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
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{
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int x, y;
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#ifdef DONT_USE_FLOATS
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int value = 0;
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#else
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double value = 0.;
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#endif
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for( y = __MAX( -i_dim, -i_line );
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y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
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y++ )
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{
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for( x = __MAX( -i_dim, -i_col );
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x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
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x++ )
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{
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#ifdef DONT_USE_FLOATS
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value += pi_distribution[y+i_dim]
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* pi_distribution[x+i_dim];
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#else
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value += ((double)pf_distribution[y+i_dim])
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* ((double)pf_distribution[x+i_dim]);
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#endif
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}
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}
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#ifdef DONT_USE_FLOATS
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pi_scale[i_line*i_pitch+i_col] = value;
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#else
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pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
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#endif
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}
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}
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}
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#ifdef DONT_USE_FLOATS
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pi_scale = p_sys->pi_scale;
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#else
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pf_scale = p_sys->pf_scale;
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#endif
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for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
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{
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uint8_t *p_in = p_pic->p[i_plane].p_pixels;
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uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
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const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
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const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
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const int i_pitch = p_pic->p[i_plane].i_pitch;
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int i_line, i_col;
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const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
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const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
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for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
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{
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for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
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{
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#ifdef DONT_USE_FLOATS
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int value = 0;
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#else
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float value = 0.;
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#endif
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int x;
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const int c = i_line*i_pitch+i_col;
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for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
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x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
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x++ )
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{
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#ifdef DONT_USE_FLOATS
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value += pi_distribution[x+i_dim]
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* p_in[c+(x>>x_factor)];
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#else
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value += pf_distribution[x+i_dim]
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* (float)p_in[c+(x>>x_factor)];
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#endif
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}
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#ifdef DONT_USE_FLOATS
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pi_buffer[c] = value;
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#else
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pf_buffer[c] = value;
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#endif
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}
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}
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for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
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{
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for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
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{
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#ifdef DONT_USE_FLOATS
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int value = 0;
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#else
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float value = 0.;
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#endif
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int y;
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const int c = i_line*i_pitch+i_col;
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for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
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y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
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y++ )
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{
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#ifdef DONT_USE_FLOATS
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value += pi_distribution[y+i_dim]
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* pi_buffer[c+(y>>y_factor)*i_pitch];
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#else
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value += pf_distribution[y+i_dim]
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* pf_buffer[c+(y>>y_factor)*i_pitch];
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#endif
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}
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#ifdef DONT_USE_FLOATS
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p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
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#else
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p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
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#endif
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}
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}
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}
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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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