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         return VLC_ENOMEM;
 150     p_sys = p_filter->p_sys;
 151
 152     p_filter->pf_video_filter = Filter;
 153
 154     config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
 155                        p_filter->p_cfg );
 156
 157     psz_filename =
 158         var_CreateGetNonEmptyStringCommand( p_filter, CFG_PREFIX "mask" );
 159
 160     if( !psz_filename )
 161     {
 162         msg_Err( p_filter, "Missing 'mask' option value." );
 163         return VLC_EGENERIC;
 164     }
 165
 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" );
 171
 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 );
 175
 176     vlc_mutex_init( &p_sys->lock );
 177
 178     return VLC_SUCCESS;
 179 }
 180
 181 /*****************************************************************************
 182  * Destroy
 183  *****************************************************************************/
 184 static void Destroy( vlc_object_t *p_this )
 185 {
 186     filter_t *p_filter = (filter_t *)p_this;
 187     filter_sys_t *p_sys = p_filter->p_sys;
 188     if( p_sys->p_mask )
 189         p_sys->p_mask->pf_release( p_sys->p_mask );
 190
 191     vlc_mutex_destroy( &p_sys->lock );
 192
 193     free( p_filter->p_sys );
 194 }
 195
 196 /*****************************************************************************
 197  * Filter
 198  *****************************************************************************/
 199 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 200 {
 201     picture_t *p_outpic;
 202
 203     if( !p_pic ) return NULL;
 204
 205     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 206     if( !p_outpic )
 207     {
 208         msg_Warn( p_filter, "can't get output picture" );
 209         if( p_pic->pf_release )
 210             p_pic->pf_release( p_pic );
 211         return NULL;
 212     }
 213
 214     /* Here */
 215     FilterErase( p_filter, p_pic, p_outpic );
 216
 217     return CopyInfoAndRelease( p_outpic, p_pic );
 218 }
 219
 220 /*****************************************************************************
 221  * FilterErase
 222  *****************************************************************************/
 223 static void FilterErase( filter_t *p_filter, picture_t *p_inpic,
 224                                              picture_t *p_outpic )
 225 {
 226     filter_sys_t *p_sys = p_filter->p_sys;
 227
 228     int i_plane;
 229
 230     const int i_mask_pitch = p_sys->p_mask->A_PITCH;
 231     const int i_mask_visible_pitch = p_sys->p_mask->p[A_PLANE].i_visible_pitch;
 232     const int i_mask_visible_lines = p_sys->p_mask->p[A_PLANE].i_visible_lines;
 233
 234     for( i_plane = 0; i_plane < p_inpic->i_planes; i_plane++ )
 235     {
 236         const int i_pitch = p_inpic->p[i_plane].i_pitch;
 237         const int i_2pitch = i_pitch<<1;
 238         const int i_visible_pitch = p_inpic->p[i_plane].i_visible_pitch;
 239         const int i_lines = p_inpic->p[i_plane].i_lines;
 240         const int i_visible_lines = p_inpic->p[i_plane].i_visible_lines;
 241
 242         uint8_t *p_inpix = p_inpic->p[i_plane].p_pixels;
 243         uint8_t *p_outpix = p_outpic->p[i_plane].p_pixels;
 244         uint8_t *p_mask = p_sys->p_mask->A_PIXELS;
 245
 246         int i_x = p_sys->i_x,
 247             i_y = p_sys->i_y;
 248         int x, y;
 249         int i_height = i_mask_visible_lines;
 250         int i_width  = i_mask_visible_pitch;
 251
 252         const bool b_line_factor = ( i_plane /* U_PLANE or V_PLANE */ &&
 253             !( p_inpic->format.i_chroma == VLC_FOURCC('I','4','2','2')
 254             || p_inpic->format.i_chroma == VLC_FOURCC('J','4','2','2') ) );
 255
 256         if( i_plane ) /* U_PLANE or V_PLANE */
 257         {
 258             i_width  >>= 1;
 259             i_x      >>= 1;
 260         }
 261         if( b_line_factor )
 262         {
 263             i_height >>= 1;
 264             i_y      >>= 1;
 265         }
 266         i_height = __MIN( i_visible_lines - i_y, i_height );
 267         i_width  = __MIN( i_visible_pitch - i_x, i_width  );
 268
 269         /* Copy original pixel buffer */
 270         vlc_memcpy( p_outpix, p_inpix, i_pitch * i_lines );
 271
 272         /* Horizontal linear interpolation of masked areas */
 273         p_outpix = p_outpic->p[i_plane].p_pixels + i_y*i_pitch + i_x;
 274         for( y = 0; y < i_height;
 275              y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
 276         {
 277             uint8_t prev, next = 0;
 278             int prev_x = -1, next_x = -2;
 279             int quot = 0;
 280
 281             /* Find a suitable value for the previous color to use when
 282              * interpoling a masked pixel's value */
 283             if( i_x )
 284             {
 285                 /* There are pixels before current position on the same line.
 286                  * Use those */
 287                 prev = *(p_outpix-1);
 288             }
 289             else if( y || i_y )
 290             {
 291                 /* This is the first pixel on a line but there other lines
 292                  * above us. Use the pixel right above */
 293                 prev = *(p_outpix-i_pitch);
 294             }
 295             else
 296             {
 297                 /* We're in the upper left corner. This sucks. We can't use
 298                  * any previous value, so we'll use a dummy one. In most
 299                  * cases this dummy value will be fixed later on in the
 300                  * algorithm */
 301                 prev = 0xff;
 302             }
 303
 304             for( x = 0; x < i_width; x++ )
 305             {
 306                 if( p_mask[i_plane?x<<1:x] > 127 )
 307                 {
 308                     /* This is a masked pixel */
 309                     if( next_x <= prev_x )
 310                     {
 311                         int x0;
 312                         /* Look for the next non masked pixel on the same
 313                          * line (inside the mask's bounding box) */
 314                         for( x0 = x; x0 < i_width; x0++ )
 315                         {
 316                             if( p_mask[i_plane?x0<<1:x0] <= 127 )
 317                             {
 318                                 /* We found an unmasked pixel. Victory! */
 319                                 next_x = x0;
 320                                 next = p_outpix[x0];
 321                                 break;
 322                             }
 323                         }
 324                         if( next_x <= prev_x )
 325                         {
 326                             /* We didn't find an unmasked pixel yet. Try
 327                              * harder */
 328                             if( x0 == x ) x0++;
 329                             if( x0 < i_visible_pitch )
 330                             {
 331                                 /* If we didn't find a non masked pixel on the
 332                                  * same line inside the mask's bounding box,
 333                                  * use the next pixel on the line (except if
 334                                  * it doesn't exist) */
 335                                 next_x = x0;
 336                                 next = p_outpix[x0];
 337                             }
 338                             else
 339                             {
 340                                 /* The last pixel on the line is masked,
 341                                  * so we'll use the "prev" value. A better
 342                                  * approach would be to use unmasked pixels
 343                                  * at the end of adjacent lines */
 344                                 next_x = x0;
 345                                 next = prev;
 346                             }
 347                         }
 348                         if( !( i_x || y || i_y ) )
 349                             /* We were unable to find a suitable value for
 350                              * the previous color (which means that we are
 351                              * on the first line in the upper left corner)
 352                              */
 353                             prev = next;
 354
 355                         /* Divide only once instead of next_x-prev_x-1 times */
 356                         quot = ((next-prev)<<16)/(next_x-prev_x);
 357                     }
 358                     /* Interpolate new value, and round correctly */
 359                     p_outpix[x] = prev + (((x-prev_x)*quot+(1<<16))>>16);
 360                 }
 361                 else
 362                 {
 363                     /* This pixel isn't masked. It's thus suitable as a
 364                      * previous color for the next interpolation */
 365                     prev = p_outpix[x];
 366                     prev_x = x;
 367                 }
 368             }
 369         }
 370
 371         /* Vertical bluring */
 372         p_mask = p_sys->p_mask->A_PIXELS;
 373         i_height = b_line_factor ? i_mask_visible_lines>>1
 374                                  : i_mask_visible_lines;
 375         /* Make sure that we stop at least 2 lines before the picture's end
 376          * (since our bluring algorithm uses the 2 next lines) */
 377         i_height = __MIN( i_visible_lines - i_y - 2, i_height );
 378         /* Make sure that we start at least 2 lines from the top (since our
 379          * bluring algorithm uses the 2 previous lines) */
 380         y = __MAX(i_y,2);
 381         p_outpix = p_outpic->p[i_plane].p_pixels + (i_y+y)*i_pitch + i_x;
 382         for( ; y < i_height; y++, p_mask += i_mask_pitch, p_outpix += i_pitch )
 383         {
 384             for( x = 0; x < i_width; x++ )
 385             {
 386                 if( p_mask[i_plane?x<<1:x] > 127 )
 387                 {
 388                     /* Ugly bluring function */
 389                     p_outpix[x] =
 390                         ( (p_outpix[x-i_2pitch]<<1)       /* 2 */
 391                         + (p_outpix[x-i_pitch ]<<2)       /* 4 */
 392                         + (p_outpix[x         ]<<2)       /* 4 */
 393                         + (p_outpix[x+i_pitch ]<<2)       /* 4 */
 394                         + (p_outpix[x+i_2pitch]<<1) )>>4; /* 2 */
 395                 }
 396             }
 397         }
 398     }
 399 }
 400
 401 static int EraseCallback( vlc_object_t *p_this, char const *psz_var,
 402                           vlc_value_t oldval, vlc_value_t newval, void *p_data )
 403 {
 404     VLC_UNUSED(oldval);
 405     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 406
 407     if( !strcmp( psz_var, CFG_PREFIX "x" ) )
 408     {
 409         vlc_mutex_lock( &p_sys->lock );
 410         p_sys->i_x = newval.i_int;
 411         vlc_mutex_unlock( &p_sys->lock );
 412     }
 413     else if( !strcmp( psz_var, CFG_PREFIX "y" ) )
 414     {
 415         vlc_mutex_lock( &p_sys->lock );
 416         p_sys->i_y = newval.i_int;
 417         vlc_mutex_unlock( &p_sys->lock );
 418     }
 419     else if( !strcmp( psz_var, CFG_PREFIX "mask" ) )
 420     {
 421         vlc_mutex_lock( &p_sys->lock );
 422         LoadMask( (filter_t*)p_this, newval.psz_string );
 423         vlc_mutex_unlock( &p_sys->lock );
 424     }
 425     else
 426     {
 427         msg_Warn( p_this, "Unknown callback command." );
 428     }
 429     return VLC_SUCCESS;
 430 }