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vlc/modules/video_filter/bluescreen.c
Can Wu b009862bea introduce VLC_CLIP() macro to replace use pair of __MAX() and __MIN() 
Signed-off-by: Rafaël Carré <funman@videolan.org>
2011-11-16 15:14:00 -05:00

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/*****************************************************************************
* bluescreen.c : Bluescreen (weather channel like) video filter for vlc
*****************************************************************************
* Copyright (C) 2005-2007 the VideoLAN team
* $Id$
*
* Authors: Antoine Cellerier <dionoea at videolan tod 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_common.h>
#include <vlc_plugin.h>
#include <vlc_filter.h>
#define BLUESCREEN_HELP N_( \
"This effect, also known as \"greenscreen\" or \"chroma key\" blends " \
"the \"blue parts\" of the foreground image of the mosaic on the " \
"background (like weather forecasts). You can choose the \"key\" " \
"color for blending (blue by default)." )
#define BLUESCREENU_TEXT N_("Bluescreen U value")
#define BLUESCREENU_LONGTEXT N_( \
"\"U\" value for the bluescreen key color " \
"(in YUV values). From 0 to 255. Defaults to 120 for blue." )
#define BLUESCREENV_TEXT N_("Bluescreen V value")
#define BLUESCREENV_LONGTEXT N_( \
"\"V\" value for the bluescreen key color " \
"(in YUV values). From 0 to 255. Defaults to 90 for blue." )
#define BLUESCREENUTOL_TEXT N_("Bluescreen U tolerance")
#define BLUESCREENUTOL_LONGTEXT N_( \
"Tolerance of the bluescreen blender " \
"on color variations for the U plane. A value between 10 and 20 " \
"seems sensible." )
#define BLUESCREENVTOL_TEXT N_("Bluescreen V tolerance")
#define BLUESCREENVTOL_LONGTEXT N_( \
"Tolerance of the bluescreen blender " \
"on color variations for the V plane. A value between 10 and 20 " \
"seems sensible." )
#define CFG_PREFIX "bluescreen-"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
static void Destroy ( vlc_object_t * );
static picture_t *Filter( filter_t *, picture_t * );
static int BluescreenCallback( vlc_object_t *, char const *,
vlc_value_t, vlc_value_t, void * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin ()
set_description( N_("Bluescreen video filter") )
set_shortname( N_("Bluescreen" ))
set_help( BLUESCREEN_HELP )
set_category( CAT_VIDEO )
set_subcategory( SUBCAT_VIDEO_VFILTER )
set_capability( "video filter2", 0 )
add_shortcut( "bluescreen" )
set_callbacks( Create, Destroy )
add_integer_with_range( CFG_PREFIX "u", 120, 0, 255,
BLUESCREENU_TEXT, BLUESCREENU_LONGTEXT, false )
add_integer_with_range( CFG_PREFIX "v", 90, 0, 255,
BLUESCREENV_TEXT, BLUESCREENV_LONGTEXT, false )
add_integer_with_range( CFG_PREFIX "ut", 17, 0, 255,
BLUESCREENUTOL_TEXT, BLUESCREENUTOL_LONGTEXT,
false )
add_integer_with_range( CFG_PREFIX "vt", 17, 0, 255,
BLUESCREENVTOL_TEXT, BLUESCREENVTOL_LONGTEXT,
false )
vlc_module_end ()
static const char *const ppsz_filter_options[] = {
"u", "v", "ut", "vt", NULL
};
struct filter_sys_t
{
vlc_mutex_t lock;
int i_u, i_v, i_ut, i_vt;
uint8_t *p_at;
};
static int Create( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
filter_sys_t *p_sys;
if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA )
{
msg_Err( p_filter,
"Unsupported input chroma \"%4.4s\". "
"Bluescreen can only use \"YUVA\".",
(char*)&p_filter->fmt_in.video.i_chroma );
return VLC_EGENERIC;
}
/* Allocate structure */
p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
if( p_filter->p_sys == NULL )
return VLC_ENOMEM;
p_sys = p_filter->p_sys;
config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
p_filter->p_cfg );
int val;
vlc_mutex_init( &p_sys->lock );
#define GET_VAR( name, min, max ) \
val = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX #name ); \
p_sys->i_##name = VLC_CLIP( val, min, max ); \
var_AddCallback( p_filter, CFG_PREFIX #name, BluescreenCallback, p_sys );
GET_VAR( u, 0x00, 0xff );
GET_VAR( v, 0x00, 0xff );
GET_VAR( ut, 0x00, 0xff );
GET_VAR( vt, 0x00, 0xff );
p_sys->p_at = NULL;
#undef GET_VAR
p_filter->pf_video_filter = Filter;
return VLC_SUCCESS;
}
static void Destroy( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
filter_sys_t *p_sys = p_filter->p_sys;
var_DelCallback( p_filter, CFG_PREFIX "u", BluescreenCallback, p_sys );
var_DelCallback( p_filter, CFG_PREFIX "v", BluescreenCallback, p_sys );
var_DelCallback( p_filter, CFG_PREFIX "ut", BluescreenCallback, p_sys );
var_DelCallback( p_filter, CFG_PREFIX "vt", BluescreenCallback, p_sys );
free( p_sys->p_at );
vlc_mutex_destroy( &p_sys->lock );
free( p_sys );
}
static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
{
filter_sys_t *p_sys = p_filter->p_sys;
int i,j;
int i_lines = p_pic->p[ A_PLANE ].i_lines;
int i_pitch = p_pic->p[ A_PLANE ].i_pitch;
uint8_t *p_a = p_pic->p[ A_PLANE ].p_pixels;
uint8_t *p_at;
uint8_t *p_u = p_pic->p[ U_PLANE ].p_pixels;
uint8_t *p_v = p_pic->p[ V_PLANE ].p_pixels;
uint8_t umin, umax, vmin, vmax;
if( p_pic->format.i_chroma != VLC_CODEC_YUVA )
{
msg_Err( p_filter,
"Unsupported input chroma \"%4.4s\". "
"Bluescreen can only use \"YUVA\".",
(char*)&p_pic->format.i_chroma );
return NULL;
}
p_sys->p_at = xrealloc( p_sys->p_at,
i_lines * i_pitch * sizeof( uint8_t ) );
p_at = p_sys->p_at;
vlc_mutex_lock( &p_sys->lock );
umin = p_sys->i_u - p_sys->i_ut >= 0x00 ? p_sys->i_u - p_sys->i_ut : 0x00;
umax = p_sys->i_u + p_sys->i_ut <= 0xff ? p_sys->i_u + p_sys->i_ut : 0xff;
vmin = p_sys->i_v - p_sys->i_vt >= 0x00 ? p_sys->i_v - p_sys->i_vt : 0x00;
vmax = p_sys->i_v + p_sys->i_vt <= 0xff ? p_sys->i_v + p_sys->i_vt : 0xff;
vlc_mutex_unlock( &p_sys->lock );
for( i = 0; i < i_lines*i_pitch; i++ )
{
if( p_u[i] < umax && p_u[i] > umin
&& p_v[i] < vmax && p_v[i] > vmin )
{
p_at[i] = 0x00;
}
else
{
p_at[i] = 0xff;
}
}
/* Gaussian convolution to make it look cleaner */
vlc_memset( p_a, 0, 2 * i_pitch );
for( i = 2; i < i_lines - 2; i++ )
{
p_a[i*i_pitch] = 0x00;
p_a[i*i_pitch+1] = 0x00;
for( j = 2; j < i_pitch - 2; j ++ )
{
p_a[i*i_pitch+j] = (uint8_t)((
/* 2 rows up */
( p_at[(i-2)*i_pitch+j-2]<<1 )
+ ( p_at[(i-2)*i_pitch+j-1]<<2 )
+ ( p_at[(i-2)*i_pitch+j]<<2 )
+ ( p_at[(i-2)*i_pitch+j+1]<<2 )
+ ( p_at[(i-2)*i_pitch+j+2]<<1 )
/* 1 row up */
+ ( p_at[(i-1)*i_pitch+j-2]<<2 )
+ ( p_at[(i-1)*i_pitch+j-1]<<3 )
+ ( p_at[(i-1)*i_pitch+j]*12 )
+ ( p_at[(i-1)*i_pitch+j+1]<<3 )
+ ( p_at[(i-1)*i_pitch+j+2]<<2 )
/* */
+ ( p_at[i*i_pitch+j-2]<<2 )
+ ( p_at[i*i_pitch+j-1]*12 )
+ ( p_at[i*i_pitch+j]<<4 )
+ ( p_at[i*i_pitch+j+1]*12 )
+ ( p_at[i*i_pitch+j+2]<<2 )
/* 1 row down */
+ ( p_at[(i+1)*i_pitch+j-2]<<2 )
+ ( p_at[(i+1)*i_pitch+j-1]<<3 )
+ ( p_at[(i+1)*i_pitch+j]*12 )
+ ( p_at[(i+1)*i_pitch+j+1]<<3 )
+ ( p_at[(i+1)*i_pitch+j+2]<<2 )
/* 2 rows down */
+ ( p_at[(i+2)*i_pitch+j-2]<<1 )
+ ( p_at[(i+2)*i_pitch+j-1]<<2 )
+ ( p_at[(i+2)*i_pitch+j]<<2 )
+ ( p_at[(i+2)*i_pitch+j+1]<<2 )
+ ( p_at[(i+2)*i_pitch+j+2]<<1 )
)/152);
if( p_a[i*i_pitch+j] < 0xbf ) p_a[i*i_pitch+j] = 0x00;
}
}
return p_pic;
}
/*****************************************************************************
* Callback to update params on the fly
*****************************************************************************/
static int BluescreenCallback( vlc_object_t *p_this, char const *psz_var,
vlc_value_t oldval, vlc_value_t newval,
void *p_data )
{
VLC_UNUSED(p_this); VLC_UNUSED(oldval);
filter_sys_t *p_sys = (filter_sys_t *) p_data;
vlc_mutex_lock( &p_sys->lock );
#define VAR_IS( a ) !strcmp( psz_var, CFG_PREFIX a )
if( VAR_IS( "u" ) )
p_sys->i_u = VLC_CLIP( newval.i_int, 0, 255 );
else if( VAR_IS( "v" ) )
p_sys->i_v = VLC_CLIP( newval.i_int, 0, 255 );
else if( VAR_IS( "ut" ) )
p_sys->i_ut = VLC_CLIP( newval.i_int, 0, 255 );
else if( VAR_IS( "vt" ) )
p_sys->i_vt = VLC_CLIP( newval.i_int, 0, 255 );
vlc_mutex_unlock( &p_sys->lock );
return VLC_SUCCESS;
}
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