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vlc/modules/video_filter/gaussianblur.c
Rémi Denis-Courmont 27d483e9ef Include vlc_plugin.h as needed
2008-05-08 19:20:21 +03:00

391 lines
12 KiB
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/*****************************************************************************
* gaussianblur.c : gaussian blur video filter
*****************************************************************************
* Copyright (C) 2000-2007 the VideoLAN team
* $Id$
*
* Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc/vlc.h>
#include <vlc_plugin.h>
#include <vlc_vout.h>
#include "vlc_filter.h"
#include <math.h> /* exp(), sqrt() */
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
static void Destroy ( vlc_object_t * );
static picture_t *Filter( filter_t *, picture_t * );
#define SIGMA_TEXT N_("Gaussian's std deviation")
#define SIGMA_LONGTEXT N_( \
"Gaussian's standard deviation. The bluring will take " \
"into account pixels up to 3*sigma away in any direction.")
#define FILTER_PREFIX "gaussianblur-"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin();
set_description( _("Gaussian blur video filter") );
set_shortname( _( "Gaussian Blur" ));
set_capability( "video filter2", 0 );
set_category( CAT_VIDEO );
set_subcategory( SUBCAT_VIDEO_VFILTER );
add_float( FILTER_PREFIX "sigma", 2., NULL, SIGMA_TEXT, SIGMA_LONGTEXT,
false );
set_callbacks( Create, Destroy );
vlc_module_end();
static const char *ppsz_filter_options[] = {
"sigma", NULL
};
/* Comment this to use floats instead of integers (faster for bigger sigma
* values)
* For sigma = 2 ints are faster
* For sigma = 4 floats are faster
*/
#define DONT_USE_FLOATS
struct filter_sys_t
{
double f_sigma;
int i_dim;
#ifdef DONT_USE_FLOATS
int *pi_distribution;
int *pi_buffer;
int *pi_scale;
#else
float *pf_distribution;
float *pf_buffer;
float *pf_scale;
#endif
};
static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
{
double f_sigma = p_sys->f_sigma;
int i_dim = (int)(3.*f_sigma);
#ifdef DONT_USE_FLOATS
int *pi_distribution = (int*)malloc( (2*i_dim+1) * sizeof( int ) );
#else
float *pf_distribution = (float*)malloc( (2*i_dim+1) * sizeof( float ) );
#endif
int x;
for( x = -i_dim; x <= i_dim; x++ )
{
#ifdef DONT_USE_FLOATS
pi_distribution[i_dim+x] =
(int)( sqrt( exp(-(x*x)/(f_sigma*f_sigma) )
/ (2.*M_PI*f_sigma*f_sigma) ) * (double)(1<<8) );
printf("%d\n",pi_distribution[i_dim+x]);
#else
pf_distribution[i_dim+x] = (float)
sqrt( exp(-(x*x)/(f_sigma*f_sigma) ) / (2.*M_PI*f_sigma*f_sigma) );
printf("%f\n",pf_distribution[i_dim+x]);
#endif
}
p_sys->i_dim = i_dim;
#ifdef DONT_USE_FLOATS
p_sys->pi_distribution = pi_distribution;
#else
p_sys->pf_distribution = pf_distribution;
#endif
}
static int Create( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
if( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
&& p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
)
{
/* We only want planar YUV 4:2:0 or 4:2:2 */
msg_Err( p_filter, "Unsupported input chroma (%4s)",
(char*)&(p_filter->fmt_in.video.i_chroma) );
return VLC_EGENERIC;
}
if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
{
msg_Err( p_filter, "Input and output chromas don't match" );
return VLC_EGENERIC;
}
p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
if( p_filter->p_sys == NULL )
{
msg_Err( p_filter, "out of memory" );
return VLC_ENOMEM;
}
config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
p_filter->p_cfg );
p_filter->pf_video_filter = Filter;
p_filter->p_sys->f_sigma =
var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
if( p_filter->p_sys->f_sigma <= 0. )
{
msg_Err( p_filter, "sigma must be positive" );
return VLC_EGENERIC;
}
gaussianblur_InitDistribution( p_filter->p_sys );
msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
p_filter->p_sys->i_dim*2+1 );
#ifdef DONT_USE_FLOATS
p_filter->p_sys->pi_buffer = NULL;
p_filter->p_sys->pi_scale = NULL;
#else
p_filter->p_sys->pf_buffer = NULL;
p_filter->p_sys->pf_scale = NULL;
#endif
return VLC_SUCCESS;
}
static void Destroy( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
#ifdef DONT_USE_FLOATS
free( p_filter->p_sys->pi_distribution );
free( p_filter->p_sys->pi_buffer );
free( p_filter->p_sys->pi_scale );
#else
free( p_filter->p_sys->pf_distribution );
free( p_filter->p_sys->pf_buffer );
free( p_filter->p_sys->pf_scale );
#endif
free( p_filter->p_sys );
}
static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
{
picture_t *p_outpic;
filter_sys_t *p_sys = p_filter->p_sys;
int i_plane;
const int i_dim = p_sys->i_dim;
#ifdef DONT_USE_FLOATS
int *pi_buffer;
int *pi_scale;
const int *pi_distribution = p_sys->pi_distribution;
#else
float *pf_buffer;
float *pf_scale;
const float *pf_distribution = p_sys->pf_distribution;
#endif
if( !p_pic ) return NULL;
p_outpic = p_filter->pf_vout_buffer_new( p_filter );
if( !p_outpic )
{
msg_Warn( p_filter, "can't get output picture" );
if( p_pic->pf_release )
p_pic->pf_release( p_pic );
return NULL;
}
#ifdef DONT_USE_FLOATS
if( !p_sys->pi_buffer )
{
p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
p_pic->p[Y_PLANE].i_visible_lines
* p_pic->p[Y_PLANE].i_pitch
* sizeof( int ) );
}
pi_buffer = p_sys->pi_buffer;
#else
if( !p_sys->pf_buffer )
{
p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
p_pic->p[Y_PLANE].i_visible_lines
* p_pic->p[Y_PLANE].i_pitch
* sizeof( float ) );
}
pf_buffer = p_sys->pf_buffer;
#endif
#ifdef DONT_USE_FLOATS
if( !p_sys->pi_scale )
#else
if( !p_sys->pf_scale )
#endif
{
const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
int i_col, i_line;
#ifdef DONT_USE_FLOATS
p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
* sizeof( int ) );
pi_scale = p_sys->pi_scale;
#else
p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
* sizeof( float ) );
pf_scale = p_sys->pf_scale;
#endif
for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
{
for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
{
int x, y;
#ifdef DONT_USE_FLOATS
int value = 0;
#else
double value = 0.;
#endif
for( y = __MAX( -i_dim, -i_line );
y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
y++ )
{
for( x = __MAX( -i_dim, -i_col );
x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
x++ )
{
#ifdef DONT_USE_FLOATS
value += pi_distribution[y+i_dim]
* pi_distribution[x+i_dim];
#else
value += ((double)pf_distribution[y+i_dim])
* ((double)pf_distribution[x+i_dim]);
#endif
}
}
#ifdef DONT_USE_FLOATS
pi_scale[i_line*i_pitch+i_col] = value;
#else
pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
#endif
}
}
}
#ifdef DONT_USE_FLOATS
pi_scale = p_sys->pi_scale;
#else
pf_scale = p_sys->pf_scale;
#endif
for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
{
uint8_t *p_in = p_pic->p[i_plane].p_pixels;
uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
const int i_pitch = p_pic->p[i_plane].i_pitch;
int i_line, i_col;
const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
{
for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
{
#ifdef DONT_USE_FLOATS
int value = 0;
#else
float value = 0.;
#endif
int x;
const int c = i_line*i_pitch+i_col;
for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
x++ )
{
#ifdef DONT_USE_FLOATS
value += pi_distribution[x+i_dim]
* p_in[c+(x>>x_factor)];
#else
value += pf_distribution[x+i_dim]
* (float)p_in[c+(x>>x_factor)];
#endif
}
#ifdef DONT_USE_FLOATS
pi_buffer[c] = value;
#else
pf_buffer[c] = value;
#endif
}
}
for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
{
for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
{
#ifdef DONT_USE_FLOATS
int value = 0;
#else
float value = 0.;
#endif
int y;
const int c = i_line*i_pitch+i_col;
for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
y++ )
{
#ifdef DONT_USE_FLOATS
value += pi_distribution[y+i_dim]
* pi_buffer[c+(y>>y_factor)*i_pitch];
#else
value += pf_distribution[y+i_dim]
* pf_buffer[c+(y>>y_factor)*i_pitch];
#endif
}
#ifdef DONT_USE_FLOATS
p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
#else
p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
#endif
}
}
}
p_outpic->date = p_pic->date;
p_outpic->b_force = p_pic->b_force;
p_outpic->i_nb_fields = p_pic->i_nb_fields;
p_outpic->b_progressive = p_pic->b_progressive;
p_outpic->b_top_field_first = p_pic->b_top_field_first;
if( p_pic->pf_release )
p_pic->pf_release( p_pic );
return p_outpic;
}
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