git.sesse.net Git - vlc/blob - modules/video_filter/erase.c

   1 /*****************************************************************************
   2  * erase.c : logo erase video filter
   3  *****************************************************************************
   4  * Copyright (C) 2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
   8  *
   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.
  13  *
  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.
  18  *
  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  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_sout.h>
  35 #include <vlc_vout.h>
  36 #include "vlc_image.h"
  37
  38 #include "vlc_filter.h"
  39 #include "filter_picture.h"
  40
  41 /*****************************************************************************
  42  * Local prototypes
  43  *****************************************************************************/
  44 static int  Create    ( vlc_object_t * );
  45 static void Destroy   ( vlc_object_t * );
  46
  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 * );
  51
  52 /*****************************************************************************
  53  * Module descriptor
  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.")
  57
  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.")
  62
  63 #define CFG_PREFIX "erase-"
  64
  65 vlc_module_begin();
  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 );
  71
  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 );
  76
  77     add_shortcut( "erase" );
  78     set_callbacks( Create, Destroy );
  79 vlc_module_end();
  80
  81 static const char *const ppsz_filter_options[] = {
  82     "mask", "x", "y", NULL
  83 };
  84
  85 /*****************************************************************************
  86  * filter_sys_t
  87  *****************************************************************************/
  88 struct filter_sys_t
  89 {
  90     int i_x;
  91     int i_y;
  92     picture_t *p_mask;
  93     vlc_mutex_t lock;
  94 };
  95
  96 static void LoadMask( filter_t *p_filter, const char *psz_filename )
  97 {
  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 )
 108     {
 109         if( p_old_mask )
 110             p_old_mask->pf_release( p_old_mask );
 111     }
 112     else if( p_old_mask )
 113     {
 114         p_filter->p_sys->p_mask = p_old_mask;
 115         msg_Err( p_filter, "Error while loading new mask. Keeping old mask." );
 116     }
 117     image_HandlerDelete( p_image );
 118 }
 119
 120 /*****************************************************************************
 121  * Create
 122  *****************************************************************************/
 123 static int Create( vlc_object_t *p_this )
 124 {
 125     filter_t *p_filter = (filter_t *)p_this;
 126     filter_sys_t *p_sys;
 127     char *psz_filename;
 128
 129     switch( p_filter->fmt_in.video.i_chroma )
 130     {
 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'):
 135
 136         case VLC_FOURCC('I','4','2','2'):
 137         case VLC_FOURCC('J','4','2','2'):
 138             break;
 139
 140         default:
 141             msg_Err( p_filter, "Unsupported input chroma (%4s)",
 142                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 143             return VLC_EGENERIC;
 144     }
 145
 146     /* Allocate structure */
 147     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 148     if( p_filter->p_sys == NULL )
 149     {
 150         msg_Err( p_filter, "out of memory" );
 151         return VLC_ENOMEM;
 152     }
 153     p_sys = p_filter->p_sys;
 154
 155     p_filter->pf_video_filter = Filter;
 156
 157     config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
 158                        p_filter->p_cfg );
 159
 160     psz_filename =
 161         var_CreateGetNonEmptyStringCommand( p_filter, CFG_PREFIX "mask" );
 162
 163     if( !psz_filename )
 164     {
 165         msg_Err( p_filter, "Missing 'mask' option value." );
 166         return VLC_EGENERIC;
 167     }
 168
 169     p_sys->p_mask = NULL;
 170     LoadMask( p_filter, psz_filename );
 171     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" );
 174
 175     var_AddCallback( p_filter, CFG_PREFIX "x", EraseCallback, p_sys );
 176     var_AddCallback( p_filter, CFG_PREFIX "y", EraseCallback, p_sys );
 177     var_AddCallback( p_filter, CFG_PREFIX "mask", EraseCallback, p_sys );
 178
 179     vlc_mutex_init( &p_sys->lock );
 180
 181     return VLC_SUCCESS;
 182 }
 183
 184 /*****************************************************************************
 185  * Destroy
 186  *****************************************************************************/
 187 static void Destroy( vlc_object_t *p_this )
 188 {
 189     filter_t *p_filter = (filter_t *)p_this;
 190     filter_sys_t *p_sys = p_filter->p_sys;
 191     if( p_sys->p_mask )
 192         p_sys->p_mask->pf_release( p_sys->p_mask );
 193
 194     vlc_mutex_destroy( &p_sys->lock );
 195
 196     free( p_filter->p_sys );
 197 }
 198
 199 /*****************************************************************************
 200  * Filter
 201  *****************************************************************************/
 202 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 203 {
 204     picture_t *p_outpic;
 205
 206     if( !p_pic ) return NULL;
 207
 208     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 209     if( !p_outpic )
 210     {
 211         msg_Warn( p_filter, "can't get output picture" );
 212         if( p_pic->pf_release )
 213             p_pic->pf_release( p_pic );
 214         return NULL;
 215     }
 216
 217     /* Here */
 218     FilterErase( p_filter, p_pic, p_outpic );
 219
 220     return CopyInfoAndRelease( p_outpic, p_pic );
 221 }
 222
 223 /*****************************************************************************
 224  * FilterErase
 225  *****************************************************************************/
 226 static void FilterErase( filter_t *p_filter, picture_t *p_inpic,
 227                                              picture_t *p_outpic )
 228 {
 229     filter_sys_t *p_sys = p_filter->p_sys;
 230
 231     int i_plane;
 232
 233     const int i_mask_pitch = p_sys->p_mask->A_PITCH;
 234     const int i_mask_visible_pitch = p_sys->p_mask->p[A_PLANE].i_visible_pitch;
 235     const int i_mask_visible_lines = p_sys->p_mask->p[A_PLANE].i_visible_lines;
 236
 237     for( i_plane = 0; i_plane < p_inpic->i_planes; i_plane++ )
 238     {
 239         const int i_pitch = p_inpic->p[i_plane].i_pitch;
 240         const int i_2pitch = i_pitch<<1;
 241         const int i_visible_pitch = p_inpic->p[i_plane].i_visible_pitch;
 242         const int i_lines = p_inpic->p[i_plane].i_lines;
 243         const int i_visible_lines = p_inpic->p[i_plane].i_visible_lines;
 244
 245         uint8_t *p_inpix = p_inpic->p[i_plane].p_pixels;
 246         uint8_t *p_outpix = p_outpic->p[i_plane].p_pixels;
 247         uint8_t *p_mask = p_sys->p_mask->A_PIXELS;
 248
 249         int i_x = p_sys->i_x,
 250             i_y = p_sys->i_y;
 251         int x, y;
 252         int i_height = i_mask_visible_lines;
 253         int i_width  = i_mask_visible_pitch;
 254
 255         const bool b_line_factor = ( i_plane /* U_PLANE or V_PLANE */ &&
 256             !( p_inpic->format.i_chroma == VLC_FOURCC('I','4','2','2')
 257             || p_inpic->format.i_chroma == VLC_FOURCC('J','4','2','2') ) );
 258
 259         if( i_plane ) /* U_PLANE or V_PLANE */
 260         {
 261             i_width  >>= 1;
 262             i_x      >>= 1;
 263         }
 264         if( b_line_factor )
 265         {
 266             i_height >>= 1;
 267             i_y      >>= 1;
 268         }
 269         i_height = __MIN( i_visible_lines - i_y, i_height );
 270         i_width  = __MIN( i_visible_pitch - i_x, i_width  );
 271
 272         /* Copy original pixel buffer */
 273         vlc_memcpy( p_outpix, p_inpix, i_pitch * i_lines );
 274
 275         /* Horizontal linear interpolation of masked areas */
 276         p_outpix = p_outpic->p[i_plane].p_pixels + i_y*i_pitch + i_x;
 277         for( y = 0; y < i_height;
 278              y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
 279         {
 280             uint8_t prev, next = 0;
 281             int prev_x = -1, next_x = -2;
 282             int quot = 0;
 283
 284             /* Find a suitable value for the previous color to use when
 285              * interpoling a masked pixel's value */
 286             if( i_x )
 287             {
 288                 /* There are pixels before current position on the same line.
 289                  * Use those */
 290                 prev = *(p_outpix-1);
 291             }
 292             else if( y || i_y )
 293             {
 294                 /* This is the first pixel on a line but there other lines
 295                  * above us. Use the pixel right above */
 296                 prev = *(p_outpix-i_pitch);
 297             }
 298             else
 299             {
 300                 /* We're in the upper left corner. This sucks. We can't use
 301                  * any previous value, so we'll use a dummy one. In most
 302                  * cases this dummy value will be fixed later on in the
 303                  * algorithm */
 304                 prev = 0xff;
 305             }
 306
 307             for( x = 0; x < i_width; x++ )
 308             {
 309                 if( p_mask[i_plane?x<<1:x] > 127 )
 310                 {
 311                     /* This is a masked pixel */
 312                     if( next_x <= prev_x )
 313                     {
 314                         int x0;
 315                         /* Look for the next non masked pixel on the same
 316                          * line (inside the mask's bounding box) */
 317                         for( x0 = x; x0 < i_width; x0++ )
 318                         {
 319                             if( p_mask[i_plane?x0<<1:x0] <= 127 )
 320                             {
 321                                 /* We found an unmasked pixel. Victory! */
 322                                 next_x = x0;
 323                                 next = p_outpix[x0];
 324                                 break;
 325                             }
 326                         }
 327                         if( next_x <= prev_x )
 328                         {
 329                             /* We didn't find an unmasked pixel yet. Try
 330                              * harder */
 331                             if( x0 == x ) x0++;
 332                             if( x0 < i_visible_pitch )
 333                             {
 334                                 /* If we didn't find a non masked pixel on the
 335                                  * same line inside the mask's bounding box,
 336                                  * use the next pixel on the line (except if
 337                                  * it doesn't exist) */
 338                                 next_x = x0;
 339                                 next = p_outpix[x0];
 340                             }
 341                             else
 342                             {
 343                                 /* The last pixel on the line is masked,
 344                                  * so we'll use the "prev" value. A better
 345                                  * approach would be to use unmasked pixels
 346                                  * at the end of adjacent lines */
 347                                 next_x = x0;
 348                                 next = prev;
 349                             }
 350                         }
 351                         if( !( i_x || y || i_y ) )
 352                             /* We were unable to find a suitable value for
 353                              * the previous color (which means that we are
 354                              * on the first line in the upper left corner)
 355                              */
 356                             prev = next;
 357
 358                         /* Divide only once instead of next_x-prev_x-1 times */
 359                         quot = ((next-prev)<<16)/(next_x-prev_x);
 360                     }
 361                     /* Interpolate new value, and round correctly */
 362                     p_outpix[x] = prev + (((x-prev_x)*quot+(1<<16))>>16);
 363                 }
 364                 else
 365                 {
 366                     /* This pixel isn't masked. It's thus suitable as a
 367                      * previous color for the next interpolation */
 368                     prev = p_outpix[x];
 369                     prev_x = x;
 370                 }
 371             }
 372         }
 373
 374         /* Vertical bluring */
 375         p_mask = p_sys->p_mask->A_PIXELS;
 376         i_height = b_line_factor ? i_mask_visible_lines>>1
 377                                  : i_mask_visible_lines;
 378         /* Make sure that we stop at least 2 lines before the picture's end
 379          * (since our bluring algorithm uses the 2 next lines) */
 380         i_height = __MIN( i_visible_lines - i_y - 2, i_height );
 381         /* Make sure that we start at least 2 lines from the top (since our
 382          * bluring algorithm uses the 2 previous lines) */
 383         y = __MAX(i_y,2);
 384         p_outpix = p_outpic->p[i_plane].p_pixels + (i_y+y)*i_pitch + i_x;
 385         for( ; y < i_height; y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
 386         {
 387             for( x = 0; x < i_width; x++ )
 388             {
 389                 if( p_mask[i_plane?x<<1:x] > 127 )
 390                 {
 391                     /* Ugly bluring function */
 392                     p_outpix[x] =
 393                         ( (p_outpix[x-i_2pitch]<<1)       /* 2 */
 394                         + (p_outpix[x-i_pitch ]<<2)       /* 4 */
 395                         + (p_outpix[x         ]<<2)       /* 4 */
 396                         + (p_outpix[x+i_pitch ]<<2)       /* 4 */
 397                         + (p_outpix[x+i_2pitch]<<1) )>>4; /* 2 */
 398                 }
 399             }
 400         }
 401     }
 402 }
 403
 404 static int EraseCallback( vlc_object_t *p_this, char const *psz_var,
 405                           vlc_value_t oldval, vlc_value_t newval, void *p_data )
 406 {
 407     VLC_UNUSED(oldval);
 408     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 409
 410     if( !strcmp( psz_var, CFG_PREFIX "x" ) )
 411     {
 412         vlc_mutex_lock( &p_sys->lock );
 413         p_sys->i_x = newval.i_int;
 414         vlc_mutex_unlock( &p_sys->lock );
 415     }
 416     else if( !strcmp( psz_var, CFG_PREFIX "y" ) )
 417     {
 418         vlc_mutex_lock( &p_sys->lock );
 419         p_sys->i_y = newval.i_int;
 420         vlc_mutex_unlock( &p_sys->lock );
 421     }
 422     else if( !strcmp( psz_var, CFG_PREFIX "mask" ) )
 423     {
 424         vlc_mutex_lock( &p_sys->lock );
 425         LoadMask( (filter_t*)p_this, newval.psz_string );
 426         vlc_mutex_unlock( &p_sys->lock );
 427     }
 428     else
 429     {
 430         msg_Warn( p_this, "Unknown callback command." );
 431     }
 432     return VLC_SUCCESS;
 433 }