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vlc/modules/video_filter/erase.c

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/*****************************************************************************
* erase.c : logo erase video filter
*****************************************************************************
* Copyright (C) 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_sout.h>
#include <vlc_vout.h>
#include "vlc_image.h"
#include "vlc_filter.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
static void Destroy ( vlc_object_t * );
static picture_t *Filter( filter_t *, picture_t * );
static void FilterErase( filter_t *, picture_t *, picture_t * );
static int EraseCallback( vlc_object_t *, char const *,
vlc_value_t, vlc_value_t, void * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define MASK_TEXT N_("Image mask")
#define MASK_LONGTEXT N_("Image mask. Pixels with an alpha value greater than 50% will be erased.")
#define POSX_TEXT N_("X coordinate")
#define POSX_LONGTEXT N_("X coordinate of the mask.")
#define POSY_TEXT N_("Y coordinate")
#define POSY_LONGTEXT N_("Y coordinate of the mask.")
#define CFG_PREFIX "erase-"
vlc_module_begin();
set_description( _("Erase video filter") );
set_shortname( _( "Erase" ));
set_capability( "video filter2", 0 );
set_category( CAT_VIDEO );
set_subcategory( SUBCAT_VIDEO_VFILTER );
add_file( CFG_PREFIX "mask", NULL, NULL,
MASK_TEXT, MASK_LONGTEXT, VLC_FALSE );
add_integer( CFG_PREFIX "x", 0, NULL, POSX_TEXT, POSX_LONGTEXT, VLC_FALSE );
add_integer( CFG_PREFIX "y", 0, NULL, POSY_TEXT, POSY_LONGTEXT, VLC_FALSE );
add_shortcut( "erase" );
set_callbacks( Create, Destroy );
vlc_module_end();
static const char *ppsz_filter_options[] = {
"mask", "x", "y", NULL
};
/*****************************************************************************
* filter_sys_t
*****************************************************************************/
struct filter_sys_t
{
int i_x;
int i_y;
picture_t *p_mask;
vlc_mutex_t lock;
};
static void LoadMask( filter_t *p_filter, const char *psz_filename )
{
image_handler_t *p_image;
video_format_t fmt_in, fmt_out;
picture_t *p_old_mask = p_filter->p_sys->p_mask;
memset( &fmt_in, 0, sizeof( video_format_t ) );
memset( &fmt_out, 0, sizeof( video_format_t ) );
fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
p_image = image_HandlerCreate( p_filter );
p_filter->p_sys->p_mask =
image_ReadUrl( p_image, psz_filename, &fmt_in, &fmt_out );
if( p_filter->p_sys->p_mask )
{
if( p_old_mask )
p_old_mask->pf_release( p_old_mask );
}
else if( p_old_mask )
{
p_filter->p_sys->p_mask = p_old_mask;
msg_Err( p_filter, "Error while loading new mask. Keeping old mask." );
}
image_HandlerDelete( p_image );
}
/*****************************************************************************
* Create
*****************************************************************************/
static int Create( vlc_object_t *p_this )
{
filter_t *p_filter = (filter_t *)p_this;
filter_sys_t *p_sys;
char *psz_filename;
switch( p_filter->fmt_in.video.i_chroma )
{
case VLC_FOURCC('I','4','2','0'):
case VLC_FOURCC('I','Y','U','V'):
case VLC_FOURCC('J','4','2','0'):
case VLC_FOURCC('Y','V','1','2'):
case VLC_FOURCC('I','4','2','2'):
case VLC_FOURCC('J','4','2','2'):
break;
default:
msg_Err( p_filter, "Unsupported input chroma (%4s)",
(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 )
{
msg_Err( p_filter, "out of memory" );
return VLC_ENOMEM;
}
p_sys = p_filter->p_sys;
p_filter->pf_video_filter = Filter;
config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
p_filter->p_cfg );
psz_filename =
var_CreateGetNonEmptyStringCommand( p_filter, CFG_PREFIX "mask" );
if( !psz_filename )
{
msg_Err( p_filter, "Missing 'mask' option value." );
return VLC_EGENERIC;
}
p_sys->p_mask = NULL;
LoadMask( p_filter, psz_filename );
free( psz_filename );
p_sys->i_x = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "x" );
p_sys->i_y = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "y" );
var_AddCallback( p_filter, CFG_PREFIX "x", EraseCallback, p_sys );
var_AddCallback( p_filter, CFG_PREFIX "y", EraseCallback, p_sys );
var_AddCallback( p_filter, CFG_PREFIX "mask", EraseCallback, p_sys );
vlc_mutex_init( p_filter, &p_sys->lock );
return VLC_SUCCESS;
}
/*****************************************************************************
* Destroy
*****************************************************************************/
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;
if( p_sys->p_mask )
p_sys->p_mask->pf_release( p_sys->p_mask );
vlc_mutex_destroy( &p_sys->lock );
free( p_filter->p_sys );
}
/*****************************************************************************
* Filter
*****************************************************************************/
static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
{
picture_t *p_outpic;
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;
}
/* Here */
FilterErase( p_filter, p_pic, p_outpic );
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;
}
/*****************************************************************************
* FilterErase
*****************************************************************************/
static void FilterErase( filter_t *p_filter, picture_t *p_inpic,
picture_t *p_outpic )
{
filter_sys_t *p_sys = p_filter->p_sys;
int i_plane;
const int i_mask_pitch = p_sys->p_mask->A_PITCH;
const int i_mask_visible_pitch = p_sys->p_mask->p[A_PLANE].i_visible_pitch;
const int i_mask_visible_lines = p_sys->p_mask->p[A_PLANE].i_visible_lines;
for( i_plane = 0; i_plane < p_inpic->i_planes; i_plane++ )
{
const int i_pitch = p_inpic->p[i_plane].i_pitch;
const int i_2pitch = i_pitch<<1;
const int i_visible_pitch = p_inpic->p[i_plane].i_visible_pitch;
const int i_lines = p_inpic->p[i_plane].i_lines;
const int i_visible_lines = p_inpic->p[i_plane].i_visible_lines;
uint8_t *p_inpix = p_inpic->p[i_plane].p_pixels;
uint8_t *p_outpix = p_outpic->p[i_plane].p_pixels;
uint8_t *p_mask = p_sys->p_mask->A_PIXELS;
int i_x = p_sys->i_x,
i_y = p_sys->i_y;
int x, y;
int i_height = i_mask_visible_lines;
int i_width = i_mask_visible_pitch;
const vlc_bool_t b_line_factor = ( i_plane /* U_PLANE or V_PLANE */ &&
!( p_inpic->format.i_chroma == VLC_FOURCC('I','4','2','2')
|| p_inpic->format.i_chroma == VLC_FOURCC('J','4','2','2') ) );
if( i_plane ) /* U_PLANE or V_PLANE */
{
i_width >>= 1;
i_x >>= 1;
}
if( b_line_factor )
{
i_height >>= 1;
i_y >>= 1;
}
i_height = __MIN( i_visible_lines - i_y, i_height );
i_width = __MIN( i_visible_pitch - i_x, i_width );
/* Copy original pixel buffer */
p_filter->p_libvlc->pf_memcpy( p_outpix, p_inpix, i_pitch * i_lines );
/* Horizontal linear interpolation of masked areas */
p_outpix = p_outpic->p[i_plane].p_pixels + i_y*i_pitch + i_x;
for( y = 0; y < i_height;
y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
{
uint8_t prev, next = 0;
int prev_x = -1, next_x = -2;
int quot = 0;
/* Find a suitable value for the previous color to use when
* interpoling a masked pixel's value */
if( i_x )
{
/* There are pixels before current position on the same line.
* Use those */
prev = *(p_outpix-1);
}
else if( y || i_y )
{
/* This is the first pixel on a line but there other lines
* above us. Use the pixel right above */
prev = *(p_outpix-i_pitch);
}
else
{
/* We're in the upper left corner. This sucks. We can't use
* any previous value, so we'll use a dummy one. In most
* cases this dummy value will be fixed later on in the
* algorithm */
prev = 0xff;
}
for( x = 0; x < i_width; x++ )
{
if( p_mask[i_plane?x<<1:x] > 127 )
{
/* This is a masked pixel */
if( next_x <= prev_x )
{
int x0;
/* Look for the next non masked pixel on the same
* line (inside the mask's bounding box) */
for( x0 = x; x0 < i_width; x0++ )
{
if( p_mask[i_plane?x0<<1:x0] <= 127 )
{
/* We found an unmasked pixel. Victory! */
next_x = x0;
next = p_outpix[x0];
break;
}
}
if( next_x <= prev_x )
{
/* We didn't find an unmasked pixel yet. Try
* harder */
if( x0 == x ) x0++;
if( x0 < i_visible_pitch )
{
/* If we didn't find a non masked pixel on the
* same line inside the mask's bounding box,
* use the next pixel on the line (except if
* it doesn't exist) */
next_x = x0;
next = p_outpix[x0];
}
else
{
/* The last pixel on the line is masked,
* so we'll use the "prev" value. A better
* approach would be to use unmasked pixels
* at the end of adjacent lines */
next_x = x0;
next = prev;
}
}
if( !( i_x || y || i_y ) )
/* We were unable to find a suitable value for
* the previous color (which means that we are
* on the first line in the upper left corner)
*/
prev = next;
/* Divide only once instead of next_x-prev_x-1 times */
quot = ((next-prev)<<16)/(next_x-prev_x);
}
/* Interpolate new value, and round correctly */
p_outpix[x] = prev + (((x-prev_x)*quot+(1<<16))>>16);
}
else
{
/* This pixel isn't masked. It's thus suitable as a
* previous color for the next interpolation */
prev = p_outpix[x];
prev_x = x;
}
}
}
/* Vertical bluring */
p_mask = p_sys->p_mask->A_PIXELS;
i_height = b_line_factor ? i_mask_visible_lines>>1
: i_mask_visible_lines;
/* Make sure that we stop at least 2 lines before the picture's end
* (since our bluring algorithm uses the 2 next lines) */
i_height = __MIN( i_visible_lines - i_y - 2, i_height );
/* Make sure that we start at least 2 lines from the top (since our
* bluring algorithm uses the 2 previous lines) */
y = __MAX(i_y,2);
p_outpix = p_outpic->p[i_plane].p_pixels + (i_y+y)*i_pitch + i_x;
for( ; y < i_height; y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
{
for( x = 0; x < i_width; x++ )
{
if( p_mask[i_plane?x<<1:x] > 127 )
{
/* Ugly bluring function */
p_outpix[x] =
( (p_outpix[x-i_2pitch]<<1) /* 2 */
+ (p_outpix[x-i_pitch ]<<2) /* 4 */
+ (p_outpix[x ]<<2) /* 4 */
+ (p_outpix[x+i_pitch ]<<2) /* 4 */
+ (p_outpix[x+i_2pitch]<<1) )>>4; /* 2 */
}
}
}
}
}
static int EraseCallback( vlc_object_t *p_this, char const *psz_var,
vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
VLC_UNUSED(oldval);
filter_sys_t *p_sys = (filter_sys_t *)p_data;
if( !strcmp( psz_var, CFG_PREFIX "x" ) )
{
vlc_mutex_lock( &p_sys->lock );
p_sys->i_x = newval.i_int;
vlc_mutex_unlock( &p_sys->lock );
}
else if( !strcmp( psz_var, CFG_PREFIX "y" ) )
{
vlc_mutex_lock( &p_sys->lock );
p_sys->i_y = newval.i_int;
vlc_mutex_unlock( &p_sys->lock );
}
else if( !strcmp( psz_var, CFG_PREFIX "mask" ) )
{
vlc_mutex_lock( &p_sys->lock );
LoadMask( (filter_t*)p_this, newval.psz_string );
vlc_mutex_unlock( &p_sys->lock );
}
else
{
msg_Warn( p_this, "Unknown callback command." );
}
return VLC_SUCCESS;
}
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