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>
35 #include <vlc_image.h>
37 #include <vlc_filter.h>
38 #include "filter_picture.h"
40 /*****************************************************************************
42 *****************************************************************************/
43 static int Create ( vlc_object_t * );
44 static void Destroy ( vlc_object_t * );
46 static picture_t *Filter( filter_t *, picture_t * );
47 static void FilterErase( filter_t *, picture_t *, picture_t * );
48 static int EraseCallback( vlc_object_t *, char const *,
49 vlc_value_t, vlc_value_t, void * );
51 /*****************************************************************************
53 *****************************************************************************/
54 #define MASK_TEXT N_("Image mask")
55 #define MASK_LONGTEXT N_("Image mask. Pixels with an alpha value greater than 50% will be erased.")
57 #define POSX_TEXT N_("X coordinate")
58 #define POSX_LONGTEXT N_("X coordinate of the mask.")
59 #define POSY_TEXT N_("Y coordinate")
60 #define POSY_LONGTEXT N_("Y coordinate of the mask.")
62 #define CFG_PREFIX "erase-"
65 set_description( N_("Erase video filter") )
66 set_shortname( N_( "Erase" ))
67 set_capability( "video filter2", 0 )
68 set_category( CAT_VIDEO )
69 set_subcategory( SUBCAT_VIDEO_VFILTER )
71 add_file( CFG_PREFIX "mask", NULL, NULL,
72 MASK_TEXT, MASK_LONGTEXT, false )
73 add_integer( CFG_PREFIX "x", 0, NULL, POSX_TEXT, POSX_LONGTEXT, false )
74 add_integer( CFG_PREFIX "y", 0, NULL, POSY_TEXT, POSY_LONGTEXT, false )
76 add_shortcut( "erase" )
77 set_callbacks( Create, Destroy )
80 static const char *const ppsz_filter_options[] = {
81 "mask", "x", "y", NULL
84 /*****************************************************************************
86 *****************************************************************************/
95 static void LoadMask( filter_t *p_filter, const char *psz_filename )
97 image_handler_t *p_image;
98 video_format_t fmt_in, fmt_out;
99 picture_t *p_old_mask = p_filter->p_sys->p_mask;
100 memset( &fmt_in, 0, sizeof( video_format_t ) );
101 memset( &fmt_out, 0, sizeof( video_format_t ) );
102 fmt_out.i_chroma = VLC_CODEC_YUVA;
103 p_image = image_HandlerCreate( p_filter );
104 p_filter->p_sys->p_mask =
105 image_ReadUrl( p_image, psz_filename, &fmt_in, &fmt_out );
106 if( p_filter->p_sys->p_mask )
109 picture_Release( p_old_mask );
111 else if( p_old_mask )
113 p_filter->p_sys->p_mask = p_old_mask;
114 msg_Err( p_filter, "Error while loading new mask. Keeping old mask." );
117 msg_Err( p_filter, "Error while loading new mask. No mask available." );
119 image_HandlerDelete( p_image );
122 /*****************************************************************************
124 *****************************************************************************/
125 static int Create( vlc_object_t *p_this )
127 filter_t *p_filter = (filter_t *)p_this;
131 switch( p_filter->fmt_in.video.i_chroma )
142 msg_Err( p_filter, "Unsupported input chroma (%4s)",
143 (char*)&(p_filter->fmt_in.video.i_chroma) );
147 /* Allocate structure */
148 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
149 if( p_filter->p_sys == NULL )
151 p_sys = p_filter->p_sys;
153 p_filter->pf_video_filter = Filter;
155 config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
159 var_CreateGetNonEmptyStringCommand( p_filter, CFG_PREFIX "mask" );
163 msg_Err( p_filter, "Missing 'mask' option value." );
168 p_sys->p_mask = NULL;
169 LoadMask( p_filter, psz_filename );
170 free( psz_filename );
172 p_sys->i_x = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "x" );
173 p_sys->i_y = var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "y" );
175 vlc_mutex_init( &p_sys->lock );
176 var_AddCallback( p_filter, CFG_PREFIX "x", EraseCallback, p_sys );
177 var_AddCallback( p_filter, CFG_PREFIX "y", EraseCallback, p_sys );
178 var_AddCallback( p_filter, CFG_PREFIX "mask", EraseCallback, p_sys );
183 /*****************************************************************************
185 *****************************************************************************/
186 static void Destroy( vlc_object_t *p_this )
188 filter_t *p_filter = (filter_t *)p_this;
189 filter_sys_t *p_sys = p_filter->p_sys;
191 picture_Release( p_sys->p_mask );
193 var_DelCallback( p_filter, CFG_PREFIX "x", EraseCallback, p_sys );
194 var_DelCallback( p_filter, CFG_PREFIX "y", EraseCallback, p_sys );
195 var_DelCallback( p_filter, CFG_PREFIX "mask", EraseCallback, p_sys );
196 vlc_mutex_destroy( &p_sys->lock );
198 free( p_filter->p_sys );
201 /*****************************************************************************
203 *****************************************************************************/
204 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
207 filter_sys_t *p_sys = p_filter->p_sys;
209 if( !p_pic ) return NULL;
211 p_outpic = filter_NewPicture( p_filter );
214 picture_Release( p_pic );
218 /* If the mask is empty: just copy the image */
219 vlc_mutex_lock( &p_sys->lock );
221 FilterErase( p_filter, p_pic, p_outpic );
223 picture_CopyPixels( p_outpic, p_pic );
224 vlc_mutex_unlock( &p_sys->lock );
226 return CopyInfoAndRelease( p_outpic, p_pic );
229 /*****************************************************************************
231 *****************************************************************************/
232 static void FilterErase( filter_t *p_filter, picture_t *p_inpic,
233 picture_t *p_outpic )
235 filter_sys_t *p_sys = p_filter->p_sys;
237 const int i_mask_pitch = p_sys->p_mask->A_PITCH;
238 const int i_mask_visible_pitch = p_sys->p_mask->p[A_PLANE].i_visible_pitch;
239 const int i_mask_visible_lines = p_sys->p_mask->p[A_PLANE].i_visible_lines;
241 for( int i_plane = 0; i_plane < p_inpic->i_planes; i_plane++ )
243 const int i_pitch = p_inpic->p[i_plane].i_pitch;
244 const int i_2pitch = i_pitch<<1;
245 const int i_visible_pitch = p_inpic->p[i_plane].i_visible_pitch;
246 const int i_lines = p_inpic->p[i_plane].i_lines;
247 const int i_visible_lines = p_inpic->p[i_plane].i_visible_lines;
249 uint8_t *p_inpix = p_inpic->p[i_plane].p_pixels;
250 uint8_t *p_outpix = p_outpic->p[i_plane].p_pixels;
251 uint8_t *p_mask = p_sys->p_mask->A_PIXELS;
252 int i_x = p_sys->i_x, i_y = p_sys->i_y;
255 int i_height = i_mask_visible_lines;
256 int i_width = i_mask_visible_pitch;
258 const bool b_line_factor = ( i_plane /* U_PLANE or V_PLANE */ &&
259 !( p_inpic->format.i_chroma == VLC_CODEC_I422
260 || p_inpic->format.i_chroma == VLC_CODEC_J422 ) );
262 if( i_plane ) /* U_PLANE or V_PLANE */
272 i_height = __MIN( i_visible_lines - i_y, i_height );
273 i_width = __MIN( i_visible_pitch - i_x, i_width );
275 /* Copy original pixel buffer */
276 vlc_memcpy( p_outpix, p_inpix, i_pitch * i_lines );
278 /* Horizontal linear interpolation of masked areas */
279 p_outpix = p_outpic->p[i_plane].p_pixels + i_y*i_pitch + i_x;
280 for( y = 0; y < i_height;
281 y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
283 uint8_t prev, next = 0;
284 int prev_x = -1, next_x = -2;
287 /* Find a suitable value for the previous color to use when
288 * interpoling a masked pixel's value */
291 /* There are pixels before current position on the same line.
293 prev = *(p_outpix-1);
297 /* This is the first pixel on a line but there other lines
298 * above us. Use the pixel right above */
299 prev = *(p_outpix-i_pitch);
303 /* We're in the upper left corner. This sucks. We can't use
304 * any previous value, so we'll use a dummy one. In most
305 * cases this dummy value will be fixed later on in the
310 for( x = 0; x < i_width; x++ )
312 if( p_mask[i_plane?x<<1:x] > 127 )
314 /* This is a masked pixel */
315 if( next_x <= prev_x )
318 /* Look for the next non masked pixel on the same
319 * line (inside the mask's bounding box) */
320 for( x0 = x; x0 < i_width; x0++ )
322 if( p_mask[i_plane?x0<<1:x0] <= 127 )
324 /* We found an unmasked pixel. Victory! */
330 if( next_x <= prev_x )
332 /* We didn't find an unmasked pixel yet. Try
335 if( x0 < i_visible_pitch )
337 /* If we didn't find a non masked pixel on the
338 * same line inside the mask's bounding box,
339 * use the next pixel on the line (except if
340 * it doesn't exist) */
346 /* The last pixel on the line is masked,
347 * so we'll use the "prev" value. A better
348 * approach would be to use unmasked pixels
349 * at the end of adjacent lines */
354 if( !( i_x || y || i_y ) )
355 /* We were unable to find a suitable value for
356 * the previous color (which means that we are
357 * on the first line in the upper left corner)
361 /* Divide only once instead of next_x-prev_x-1 times */
362 quot = ((next-prev)<<16)/(next_x-prev_x);
364 /* Interpolate new value, and round correctly */
365 p_outpix[x] = prev + (((x-prev_x)*quot+(1<<16))>>16);
369 /* This pixel isn't masked. It's thus suitable as a
370 * previous color for the next interpolation */
377 /* Vertical bluring */
378 p_mask = p_sys->p_mask->A_PIXELS;
379 i_height = b_line_factor ? i_mask_visible_lines>>1
380 : i_mask_visible_lines;
381 /* Make sure that we stop at least 2 lines before the picture's end
382 * (since our bluring algorithm uses the 2 next lines) */
383 i_height = __MIN( i_visible_lines - i_y - 2, i_height );
384 /* Make sure that we start at least 2 lines from the top (since our
385 * bluring algorithm uses the 2 previous lines) */
387 p_outpix = p_outpic->p[i_plane].p_pixels + (i_y+y)*i_pitch + i_x;
388 for( ; y < i_height; y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
390 for( x = 0; x < i_width; x++ )
392 if( p_mask[i_plane?x<<1:x] > 127 )
394 /* Ugly bluring function */
396 ( (p_outpix[x-i_2pitch]<<1) /* 2 */
397 + (p_outpix[x-i_pitch ]<<2) /* 4 */
398 + (p_outpix[x ]<<2) /* 4 */
399 + (p_outpix[x+i_pitch ]<<2) /* 4 */
400 + (p_outpix[x+i_2pitch]<<1) )>>4; /* 2 */
407 static int EraseCallback( vlc_object_t *p_this, char const *psz_var,
408 vlc_value_t oldval, vlc_value_t newval, void *p_data )
411 filter_sys_t *p_sys = (filter_sys_t *)p_data;
413 if( !strcmp( psz_var, CFG_PREFIX "x" ) )
415 vlc_mutex_lock( &p_sys->lock );
416 p_sys->i_x = newval.i_int;
417 vlc_mutex_unlock( &p_sys->lock );
419 else if( !strcmp( psz_var, CFG_PREFIX "y" ) )
421 vlc_mutex_lock( &p_sys->lock );
422 p_sys->i_y = newval.i_int;
423 vlc_mutex_unlock( &p_sys->lock );
425 else if( !strcmp( psz_var, CFG_PREFIX "mask" ) )
427 vlc_mutex_lock( &p_sys->lock );
428 LoadMask( (filter_t*)p_this, newval.psz_string );
429 vlc_mutex_unlock( &p_sys->lock );
433 msg_Warn( p_this, "Unknown callback command." );