1 /*****************************************************************************
2 * erase.c : logo erase video filter
3 *****************************************************************************
4 * Copyright (C) 2007 the VideoLAN team
7 * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
36 #include "vlc_image.h"
38 #include "vlc_filter.h"
39 #include "filter_picture.h"
41 /*****************************************************************************
43 *****************************************************************************/
44 static int Create ( vlc_object_t * );
45 static void Destroy ( vlc_object_t * );
47 static picture_t *Filter( filter_t *, picture_t * );
48 static void FilterErase( filter_t *, picture_t *, picture_t * );
49 static int EraseCallback( vlc_object_t *, char const *,
50 vlc_value_t, vlc_value_t, void * );
52 /*****************************************************************************
54 *****************************************************************************/
55 #define MASK_TEXT N_("Image mask")
56 #define MASK_LONGTEXT N_("Image mask. Pixels with an alpha value greater than 50% will be erased.")
58 #define POSX_TEXT N_("X coordinate")
59 #define POSX_LONGTEXT N_("X coordinate of the mask.")
60 #define POSY_TEXT N_("Y coordinate")
61 #define POSY_LONGTEXT N_("Y coordinate of the mask.")
63 #define CFG_PREFIX "erase-"
66 set_description( N_("Erase video filter") );
67 set_shortname( N_( "Erase" ));
68 set_capability( "video filter2", 0 );
69 set_category( CAT_VIDEO );
70 set_subcategory( SUBCAT_VIDEO_VFILTER );
72 add_file( CFG_PREFIX "mask", NULL, NULL,
73 MASK_TEXT, MASK_LONGTEXT, false );
74 add_integer( CFG_PREFIX "x", 0, NULL, POSX_TEXT, POSX_LONGTEXT, false );
75 add_integer( CFG_PREFIX "y", 0, NULL, POSY_TEXT, POSY_LONGTEXT, false );
77 add_shortcut( "erase" );
78 set_callbacks( Create, Destroy );
81 static const char *const ppsz_filter_options[] = {
82 "mask", "x", "y", NULL
85 /*****************************************************************************
87 *****************************************************************************/
96 static void LoadMask( filter_t *p_filter, const char *psz_filename )
98 image_handler_t *p_image;
99 video_format_t fmt_in, fmt_out;
100 picture_t *p_old_mask = p_filter->p_sys->p_mask;
101 memset( &fmt_in, 0, sizeof( video_format_t ) );
102 memset( &fmt_out, 0, sizeof( video_format_t ) );
103 fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
104 p_image = image_HandlerCreate( p_filter );
105 p_filter->p_sys->p_mask =
106 image_ReadUrl( p_image, psz_filename, &fmt_in, &fmt_out );
107 if( p_filter->p_sys->p_mask )
110 picture_Release( p_old_mask );
112 else if( p_old_mask )
114 p_filter->p_sys->p_mask = p_old_mask;
115 msg_Err( p_filter, "Error while loading new mask. Keeping old mask." );
117 image_HandlerDelete( p_image );
120 /*****************************************************************************
122 *****************************************************************************/
123 static int Create( vlc_object_t *p_this )
125 filter_t *p_filter = (filter_t *)p_this;
129 switch( p_filter->fmt_in.video.i_chroma )
131 case VLC_FOURCC('I','4','2','0'):
132 case VLC_FOURCC('I','Y','U','V'):
133 case VLC_FOURCC('J','4','2','0'):
134 case VLC_FOURCC('Y','V','1','2'):
136 case VLC_FOURCC('I','4','2','2'):
137 case VLC_FOURCC('J','4','2','2'):
141 msg_Err( p_filter, "Unsupported input chroma (%4s)",
142 (char*)&(p_filter->fmt_in.video.i_chroma) );
146 /* Allocate structure */
147 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
148 if( p_filter->p_sys == NULL )
150 p_sys = p_filter->p_sys;
152 p_filter->pf_video_filter = Filter;
154 config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
158 var_CreateGetNonEmptyStringCommand( p_filter, CFG_PREFIX "mask" );
162 msg_Err( p_filter, "Missing 'mask' option value." );
166 p_sys->p_mask = NULL;
167 LoadMask( p_filter, psz_filename );
168 free( psz_filename );
169 p_sys->i_x = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "x" );
170 p_sys->i_y = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "y" );
172 var_AddCallback( p_filter, CFG_PREFIX "x", EraseCallback, p_sys );
173 var_AddCallback( p_filter, CFG_PREFIX "y", EraseCallback, p_sys );
174 var_AddCallback( p_filter, CFG_PREFIX "mask", EraseCallback, p_sys );
176 vlc_mutex_init( &p_sys->lock );
181 /*****************************************************************************
183 *****************************************************************************/
184 static void Destroy( vlc_object_t *p_this )
186 filter_t *p_filter = (filter_t *)p_this;
187 filter_sys_t *p_sys = p_filter->p_sys;
189 picture_Release( p_sys->p_mask );
191 vlc_mutex_destroy( &p_sys->lock );
193 free( p_filter->p_sys );
196 /*****************************************************************************
198 *****************************************************************************/
199 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
203 if( !p_pic ) return NULL;
205 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
208 msg_Warn( p_filter, "can't get output picture" );
209 picture_Release( p_pic );
214 FilterErase( p_filter, p_pic, p_outpic );
216 return CopyInfoAndRelease( p_outpic, p_pic );
219 /*****************************************************************************
221 *****************************************************************************/
222 static void FilterErase( filter_t *p_filter, picture_t *p_inpic,
223 picture_t *p_outpic )
225 filter_sys_t *p_sys = p_filter->p_sys;
229 const int i_mask_pitch = p_sys->p_mask->A_PITCH;
230 const int i_mask_visible_pitch = p_sys->p_mask->p[A_PLANE].i_visible_pitch;
231 const int i_mask_visible_lines = p_sys->p_mask->p[A_PLANE].i_visible_lines;
233 for( i_plane = 0; i_plane < p_inpic->i_planes; i_plane++ )
235 const int i_pitch = p_inpic->p[i_plane].i_pitch;
236 const int i_2pitch = i_pitch<<1;
237 const int i_visible_pitch = p_inpic->p[i_plane].i_visible_pitch;
238 const int i_lines = p_inpic->p[i_plane].i_lines;
239 const int i_visible_lines = p_inpic->p[i_plane].i_visible_lines;
241 uint8_t *p_inpix = p_inpic->p[i_plane].p_pixels;
242 uint8_t *p_outpix = p_outpic->p[i_plane].p_pixels;
243 uint8_t *p_mask = p_sys->p_mask->A_PIXELS;
245 int i_x = p_sys->i_x,
248 int i_height = i_mask_visible_lines;
249 int i_width = i_mask_visible_pitch;
251 const bool b_line_factor = ( i_plane /* U_PLANE or V_PLANE */ &&
252 !( p_inpic->format.i_chroma == VLC_FOURCC('I','4','2','2')
253 || p_inpic->format.i_chroma == VLC_FOURCC('J','4','2','2') ) );
255 if( i_plane ) /* U_PLANE or V_PLANE */
265 i_height = __MIN( i_visible_lines - i_y, i_height );
266 i_width = __MIN( i_visible_pitch - i_x, i_width );
268 /* Copy original pixel buffer */
269 vlc_memcpy( p_outpix, p_inpix, i_pitch * i_lines );
271 /* Horizontal linear interpolation of masked areas */
272 p_outpix = p_outpic->p[i_plane].p_pixels + i_y*i_pitch + i_x;
273 for( y = 0; y < i_height;
274 y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
276 uint8_t prev, next = 0;
277 int prev_x = -1, next_x = -2;
280 /* Find a suitable value for the previous color to use when
281 * interpoling a masked pixel's value */
284 /* There are pixels before current position on the same line.
286 prev = *(p_outpix-1);
290 /* This is the first pixel on a line but there other lines
291 * above us. Use the pixel right above */
292 prev = *(p_outpix-i_pitch);
296 /* We're in the upper left corner. This sucks. We can't use
297 * any previous value, so we'll use a dummy one. In most
298 * cases this dummy value will be fixed later on in the
303 for( x = 0; x < i_width; x++ )
305 if( p_mask[i_plane?x<<1:x] > 127 )
307 /* This is a masked pixel */
308 if( next_x <= prev_x )
311 /* Look for the next non masked pixel on the same
312 * line (inside the mask's bounding box) */
313 for( x0 = x; x0 < i_width; x0++ )
315 if( p_mask[i_plane?x0<<1:x0] <= 127 )
317 /* We found an unmasked pixel. Victory! */
323 if( next_x <= prev_x )
325 /* We didn't find an unmasked pixel yet. Try
328 if( x0 < i_visible_pitch )
330 /* If we didn't find a non masked pixel on the
331 * same line inside the mask's bounding box,
332 * use the next pixel on the line (except if
333 * it doesn't exist) */
339 /* The last pixel on the line is masked,
340 * so we'll use the "prev" value. A better
341 * approach would be to use unmasked pixels
342 * at the end of adjacent lines */
347 if( !( i_x || y || i_y ) )
348 /* We were unable to find a suitable value for
349 * the previous color (which means that we are
350 * on the first line in the upper left corner)
354 /* Divide only once instead of next_x-prev_x-1 times */
355 quot = ((next-prev)<<16)/(next_x-prev_x);
357 /* Interpolate new value, and round correctly */
358 p_outpix[x] = prev + (((x-prev_x)*quot+(1<<16))>>16);
362 /* This pixel isn't masked. It's thus suitable as a
363 * previous color for the next interpolation */
370 /* Vertical bluring */
371 p_mask = p_sys->p_mask->A_PIXELS;
372 i_height = b_line_factor ? i_mask_visible_lines>>1
373 : i_mask_visible_lines;
374 /* Make sure that we stop at least 2 lines before the picture's end
375 * (since our bluring algorithm uses the 2 next lines) */
376 i_height = __MIN( i_visible_lines - i_y - 2, i_height );
377 /* Make sure that we start at least 2 lines from the top (since our
378 * bluring algorithm uses the 2 previous lines) */
380 p_outpix = p_outpic->p[i_plane].p_pixels + (i_y+y)*i_pitch + i_x;
381 for( ; y < i_height; y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
383 for( x = 0; x < i_width; x++ )
385 if( p_mask[i_plane?x<<1:x] > 127 )
387 /* Ugly bluring function */
389 ( (p_outpix[x-i_2pitch]<<1) /* 2 */
390 + (p_outpix[x-i_pitch ]<<2) /* 4 */
391 + (p_outpix[x ]<<2) /* 4 */
392 + (p_outpix[x+i_pitch ]<<2) /* 4 */
393 + (p_outpix[x+i_2pitch]<<1) )>>4; /* 2 */
400 static int EraseCallback( vlc_object_t *p_this, char const *psz_var,
401 vlc_value_t oldval, vlc_value_t newval, void *p_data )
404 filter_sys_t *p_sys = (filter_sys_t *)p_data;
406 if( !strcmp( psz_var, CFG_PREFIX "x" ) )
408 vlc_mutex_lock( &p_sys->lock );
409 p_sys->i_x = newval.i_int;
410 vlc_mutex_unlock( &p_sys->lock );
412 else if( !strcmp( psz_var, CFG_PREFIX "y" ) )
414 vlc_mutex_lock( &p_sys->lock );
415 p_sys->i_y = newval.i_int;
416 vlc_mutex_unlock( &p_sys->lock );
418 else if( !strcmp( psz_var, CFG_PREFIX "mask" ) )
420 vlc_mutex_lock( &p_sys->lock );
421 LoadMask( (filter_t*)p_this, newval.psz_string );
422 vlc_mutex_unlock( &p_sys->lock );
426 msg_Warn( p_this, "Unknown callback command." );