--- /dev/null
+/*****************************************************************************
+ * 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
+ *****************************************************************************/
+#include <stdlib.h> /* malloc(), free() */
+#include <string.h>
+
+#include <math.h> /* sin(), cos() */
+
+#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 = {0}, fmt_out = {0};
+ fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
+ if( p_filter->p_sys->p_mask )
+ p_filter->p_sys->p_mask->pf_release( p_filter->p_sys->p_mask );
+ p_image = image_HandlerCreate( p_filter );
+ p_filter->p_sys->p_mask =
+ image_ReadUrl( p_image, psz_filename, &fmt_in, &fmt_out );
+ 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;
+
+ /* 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_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 x, y;
+ int i_height = i_mask_visible_lines;
+ int i_width = i_mask_visible_pitch;
+ if( i_plane )
+ {
+ i_height /= 2;
+ i_width /= 2;
+ }
+ i_height = __MIN( i_visible_lines - (i_plane?p_sys->i_y/2:p_sys->i_y), i_height );
+ i_width = __MIN( i_visible_pitch - (i_plane?p_sys->i_x/2:p_sys->i_x), i_width );
+
+ p_filter->p_libvlc->pf_memcpy( p_outpix, p_inpix, i_pitch * i_lines );
+
+ for( y = 0; y < i_height;
+ y++, p_mask += i_plane ? 2*i_mask_pitch : i_mask_pitch )
+ {
+ uint8_t prev, next;
+ int prev_x = 0, next_x = -1;
+ p_outpix = i_plane ?
+ p_outpic->p[i_plane].p_pixels
+ + (p_sys->i_y/2+y)*i_pitch + (p_sys->i_x/2)
+ :
+ p_outpic->p[i_plane].p_pixels
+ + (p_sys->i_y+y)*i_pitch + p_sys->i_x;
+ if( p_sys->i_x )
+ {
+ prev = *(p_outpix-1);
+ }
+ else if( y || p_sys->i_y )
+ {
+ prev = *(p_outpix-i_pitch);
+ }
+ else
+ {
+ prev = 0xff;
+ }
+ for( x = 0; x < i_width; x++ )
+ {
+ if( p_mask[i_plane?2*x:x] > 127 )
+ {
+ if( next_x <= prev_x )
+ {
+ int x0;
+ for( x0 = x; x0 < i_width; x0++ )
+ {
+ if( p_mask[i_plane?2*x0:x0] <= 127 )
+ {
+ next_x = x0;
+ next = p_outpix[x0];
+ break;
+ }
+ }
+ if( next_x <= prev_x )
+ {
+ if( x0 == x ) x0++;
+ if( (i_plane?p_sys->i_x/2:p_sys->i_x)+i_width >= i_visible_pitch )
+ {
+ next_x = x0;
+ next = prev;
+ }
+ else
+ {
+ next_x = x0;
+ next = p_outpix[x0];
+ }
+ }
+ }
+ /* interpolate new value */
+ p_outpix[x] = prev + (x-prev_x)*(next-prev)/(next_x-prev_x);
+ }
+ else
+ {
+ prev = p_outpix[x];
+ prev_x = x;
+ }
+ }
+ }
+ }
+}
+
+static int EraseCallback( vlc_object_t *p_this, char const *psz_var,
+ vlc_value_t oldval, vlc_value_t newval, void *p_data )
+{
+ 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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