mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-04 09:11:33 +02:00
442 lines
16 KiB
C
442 lines
16 KiB
C
/*****************************************************************************
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* erase.c : logo erase video filter
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*****************************************************************************
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* Copyright (C) 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_sout.h>
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#include <vlc_vout.h>
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#include "vlc_image.h"
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#include "vlc_filter.h"
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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 void FilterErase( filter_t *, picture_t *, picture_t * );
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static int EraseCallback( vlc_object_t *, char const *,
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vlc_value_t, vlc_value_t, void * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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#define MASK_TEXT N_("Image mask")
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#define MASK_LONGTEXT N_("Image mask. Pixels with an alpha value greater than 50% will be erased.")
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#define POSX_TEXT N_("X coordinate")
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#define POSX_LONGTEXT N_("X coordinate of the mask.")
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#define POSY_TEXT N_("Y coordinate")
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#define POSY_LONGTEXT N_("Y coordinate of the mask.")
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#define CFG_PREFIX "erase-"
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vlc_module_begin();
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set_description( _("Erase video filter") );
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set_shortname( _( "Erase" ));
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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_file( CFG_PREFIX "mask", NULL, NULL,
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MASK_TEXT, MASK_LONGTEXT, false );
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add_integer( CFG_PREFIX "x", 0, NULL, POSX_TEXT, POSX_LONGTEXT, false );
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add_integer( CFG_PREFIX "y", 0, NULL, POSY_TEXT, POSY_LONGTEXT, false );
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add_shortcut( "erase" );
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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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"mask", "x", "y", NULL
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};
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/*****************************************************************************
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* filter_sys_t
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*****************************************************************************/
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struct filter_sys_t
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{
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int i_x;
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int i_y;
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picture_t *p_mask;
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vlc_mutex_t lock;
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};
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static void LoadMask( filter_t *p_filter, const char *psz_filename )
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{
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image_handler_t *p_image;
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video_format_t fmt_in, fmt_out;
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picture_t *p_old_mask = p_filter->p_sys->p_mask;
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memset( &fmt_in, 0, sizeof( video_format_t ) );
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memset( &fmt_out, 0, sizeof( video_format_t ) );
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fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
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p_image = image_HandlerCreate( p_filter );
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p_filter->p_sys->p_mask =
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image_ReadUrl( p_image, psz_filename, &fmt_in, &fmt_out );
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if( p_filter->p_sys->p_mask )
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{
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if( p_old_mask )
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p_old_mask->pf_release( p_old_mask );
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}
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else if( p_old_mask )
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{
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p_filter->p_sys->p_mask = p_old_mask;
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msg_Err( p_filter, "Error while loading new mask. Keeping old mask." );
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}
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image_HandlerDelete( p_image );
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}
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/*****************************************************************************
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* Create
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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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filter_sys_t *p_sys;
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char *psz_filename;
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switch( p_filter->fmt_in.video.i_chroma )
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{
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case VLC_FOURCC('I','4','2','0'):
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case VLC_FOURCC('I','Y','U','V'):
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case VLC_FOURCC('J','4','2','0'):
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case VLC_FOURCC('Y','V','1','2'):
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case VLC_FOURCC('I','4','2','2'):
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case VLC_FOURCC('J','4','2','2'):
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break;
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default:
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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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/* 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_sys = p_filter->p_sys;
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p_filter->pf_video_filter = Filter;
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config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
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p_filter->p_cfg );
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psz_filename =
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var_CreateGetNonEmptyStringCommand( p_filter, CFG_PREFIX "mask" );
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if( !psz_filename )
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{
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msg_Err( p_filter, "Missing 'mask' option value." );
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return VLC_EGENERIC;
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}
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p_sys->p_mask = NULL;
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LoadMask( p_filter, psz_filename );
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free( psz_filename );
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p_sys->i_x = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "x" );
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p_sys->i_y = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "y" );
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var_AddCallback( p_filter, CFG_PREFIX "x", EraseCallback, p_sys );
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var_AddCallback( p_filter, CFG_PREFIX "y", EraseCallback, p_sys );
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var_AddCallback( p_filter, CFG_PREFIX "mask", EraseCallback, p_sys );
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vlc_mutex_init( &p_sys->lock );
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Destroy
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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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filter_sys_t *p_sys = p_filter->p_sys;
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if( p_sys->p_mask )
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p_sys->p_mask->pf_release( p_sys->p_mask );
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vlc_mutex_destroy( &p_sys->lock );
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free( p_filter->p_sys );
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}
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/*****************************************************************************
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* Filter
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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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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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/* Here */
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FilterErase( p_filter, p_pic, p_outpic );
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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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/*****************************************************************************
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* FilterErase
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*****************************************************************************/
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static void FilterErase( filter_t *p_filter, picture_t *p_inpic,
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picture_t *p_outpic )
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{
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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_mask_pitch = p_sys->p_mask->A_PITCH;
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const int i_mask_visible_pitch = p_sys->p_mask->p[A_PLANE].i_visible_pitch;
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const int i_mask_visible_lines = p_sys->p_mask->p[A_PLANE].i_visible_lines;
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for( i_plane = 0; i_plane < p_inpic->i_planes; i_plane++ )
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{
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const int i_pitch = p_inpic->p[i_plane].i_pitch;
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const int i_2pitch = i_pitch<<1;
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const int i_visible_pitch = p_inpic->p[i_plane].i_visible_pitch;
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const int i_lines = p_inpic->p[i_plane].i_lines;
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const int i_visible_lines = p_inpic->p[i_plane].i_visible_lines;
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uint8_t *p_inpix = p_inpic->p[i_plane].p_pixels;
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uint8_t *p_outpix = p_outpic->p[i_plane].p_pixels;
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uint8_t *p_mask = p_sys->p_mask->A_PIXELS;
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int i_x = p_sys->i_x,
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i_y = p_sys->i_y;
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int x, y;
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int i_height = i_mask_visible_lines;
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int i_width = i_mask_visible_pitch;
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const bool b_line_factor = ( i_plane /* U_PLANE or V_PLANE */ &&
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!( p_inpic->format.i_chroma == VLC_FOURCC('I','4','2','2')
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|| p_inpic->format.i_chroma == VLC_FOURCC('J','4','2','2') ) );
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if( i_plane ) /* U_PLANE or V_PLANE */
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{
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i_width >>= 1;
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i_x >>= 1;
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}
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if( b_line_factor )
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{
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i_height >>= 1;
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i_y >>= 1;
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}
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i_height = __MIN( i_visible_lines - i_y, i_height );
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i_width = __MIN( i_visible_pitch - i_x, i_width );
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/* Copy original pixel buffer */
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vlc_memcpy( p_outpix, p_inpix, i_pitch * i_lines );
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/* Horizontal linear interpolation of masked areas */
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p_outpix = p_outpic->p[i_plane].p_pixels + i_y*i_pitch + i_x;
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for( y = 0; y < i_height;
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y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
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{
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uint8_t prev, next = 0;
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int prev_x = -1, next_x = -2;
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int quot = 0;
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/* Find a suitable value for the previous color to use when
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* interpoling a masked pixel's value */
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if( i_x )
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{
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/* There are pixels before current position on the same line.
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* Use those */
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prev = *(p_outpix-1);
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}
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else if( y || i_y )
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{
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/* This is the first pixel on a line but there other lines
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* above us. Use the pixel right above */
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prev = *(p_outpix-i_pitch);
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}
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else
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{
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/* We're in the upper left corner. This sucks. We can't use
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* any previous value, so we'll use a dummy one. In most
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* cases this dummy value will be fixed later on in the
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* algorithm */
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prev = 0xff;
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}
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for( x = 0; x < i_width; x++ )
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{
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if( p_mask[i_plane?x<<1:x] > 127 )
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{
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/* This is a masked pixel */
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if( next_x <= prev_x )
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{
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int x0;
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/* Look for the next non masked pixel on the same
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* line (inside the mask's bounding box) */
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for( x0 = x; x0 < i_width; x0++ )
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{
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if( p_mask[i_plane?x0<<1:x0] <= 127 )
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{
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/* We found an unmasked pixel. Victory! */
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next_x = x0;
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next = p_outpix[x0];
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break;
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}
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}
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if( next_x <= prev_x )
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{
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/* We didn't find an unmasked pixel yet. Try
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* harder */
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if( x0 == x ) x0++;
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if( x0 < i_visible_pitch )
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{
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/* If we didn't find a non masked pixel on the
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* same line inside the mask's bounding box,
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* use the next pixel on the line (except if
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* it doesn't exist) */
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next_x = x0;
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next = p_outpix[x0];
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}
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else
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{
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/* The last pixel on the line is masked,
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* so we'll use the "prev" value. A better
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* approach would be to use unmasked pixels
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* at the end of adjacent lines */
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next_x = x0;
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next = prev;
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}
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}
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if( !( i_x || y || i_y ) )
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/* We were unable to find a suitable value for
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* the previous color (which means that we are
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* on the first line in the upper left corner)
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*/
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prev = next;
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/* Divide only once instead of next_x-prev_x-1 times */
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quot = ((next-prev)<<16)/(next_x-prev_x);
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}
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/* Interpolate new value, and round correctly */
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p_outpix[x] = prev + (((x-prev_x)*quot+(1<<16))>>16);
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}
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else
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{
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/* This pixel isn't masked. It's thus suitable as a
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* previous color for the next interpolation */
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prev = p_outpix[x];
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prev_x = x;
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}
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}
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}
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/* Vertical bluring */
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p_mask = p_sys->p_mask->A_PIXELS;
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i_height = b_line_factor ? i_mask_visible_lines>>1
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: i_mask_visible_lines;
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/* Make sure that we stop at least 2 lines before the picture's end
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* (since our bluring algorithm uses the 2 next lines) */
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i_height = __MIN( i_visible_lines - i_y - 2, i_height );
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/* Make sure that we start at least 2 lines from the top (since our
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* bluring algorithm uses the 2 previous lines) */
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y = __MAX(i_y,2);
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p_outpix = p_outpic->p[i_plane].p_pixels + (i_y+y)*i_pitch + i_x;
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for( ; y < i_height; y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
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{
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for( x = 0; x < i_width; x++ )
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{
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if( p_mask[i_plane?x<<1:x] > 127 )
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{
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/* Ugly bluring function */
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p_outpix[x] =
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( (p_outpix[x-i_2pitch]<<1) /* 2 */
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+ (p_outpix[x-i_pitch ]<<2) /* 4 */
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+ (p_outpix[x ]<<2) /* 4 */
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+ (p_outpix[x+i_pitch ]<<2) /* 4 */
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+ (p_outpix[x+i_2pitch]<<1) )>>4; /* 2 */
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}
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}
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}
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}
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}
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static int EraseCallback( vlc_object_t *p_this, char const *psz_var,
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vlc_value_t oldval, vlc_value_t newval, void *p_data )
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{
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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, CFG_PREFIX "x" ) )
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{
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vlc_mutex_lock( &p_sys->lock );
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p_sys->i_x = newval.i_int;
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vlc_mutex_unlock( &p_sys->lock );
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}
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else if( !strcmp( psz_var, CFG_PREFIX "y" ) )
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{
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vlc_mutex_lock( &p_sys->lock );
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p_sys->i_y = newval.i_int;
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vlc_mutex_unlock( &p_sys->lock );
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}
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else if( !strcmp( psz_var, CFG_PREFIX "mask" ) )
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{
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vlc_mutex_lock( &p_sys->lock );
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LoadMask( (filter_t*)p_this, newval.psz_string );
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vlc_mutex_unlock( &p_sys->lock );
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}
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else
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{
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msg_Warn( p_this, "Unknown callback command." );
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}
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return VLC_SUCCESS;
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}
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