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

   1 /*****************************************************************************
   2  * gaussianblur.c : gaussian blur video filter
   3  *****************************************************************************
   4  * Copyright (C) 2000-2007 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 #include <vlc/vlc.h>
  29 #include <vlc_vout.h>
  30
  31 #include "vlc_filter.h"
  32
  33 #include <math.h>                                          /* exp(), sqrt() */
  34
  35 /*****************************************************************************
  36  * Local prototypes
  37  *****************************************************************************/
  38 static int  Create    ( vlc_object_t * );
  39 static void Destroy   ( vlc_object_t * );
  40
  41 static picture_t *Filter( filter_t *, picture_t * );
  42
  43 #define SIGMA_TEXT N_("Gaussian's std deviation")
  44 #define SIGMA_LONGTEXT N_( \
  45     "Gaussian's standard deviation. The bluring will take " \
  46     "into account pixels up to 3*sigma away in any direction.")
  47
  48 #define FILTER_PREFIX "gaussianblur-"
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 vlc_module_begin();
  54     set_description( _("Gaussian blur video filter") );
  55     set_shortname( _( "Gaussian Blur" ));
  56     set_capability( "video filter2", 0 );
  57     set_category( CAT_VIDEO );
  58     set_subcategory( SUBCAT_VIDEO_VFILTER );
  59
  60     add_float( FILTER_PREFIX "sigma", 2., NULL, SIGMA_TEXT, SIGMA_LONGTEXT,
  61                VLC_FALSE );
  62
  63     set_callbacks( Create, Destroy );
  64 vlc_module_end();
  65
  66 static const char *ppsz_filter_options[] = {
  67     "sigma", NULL
  68 };
  69
  70 /* Comment this to use floats instead of integers (faster for bigger sigma
  71  * values)
  72  * For sigma = 2 ints are faster
  73  * For sigma = 4 floats are faster
  74  */
  75 #define DONT_USE_FLOATS
  76 struct filter_sys_t
  77 {
  78     double f_sigma;
  79     int i_dim;
  80 #ifdef DONT_USE_FLOATS
  81     int *pi_distribution;
  82     int *pi_buffer;
  83     int *pi_scale;
  84 #else
  85     float *pf_distribution;
  86     float *pf_buffer;
  87     float *pf_scale;
  88 #endif
  89 };
  90
  91 static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
  92 {
  93     double f_sigma = p_sys->f_sigma;
  94     int i_dim = (int)(3.*f_sigma);
  95 #ifdef DONT_USE_FLOATS
  96     int *pi_distribution = (int*)malloc( (2*i_dim+1) * sizeof( int ) );
  97 #else
  98     float *pf_distribution = (float*)malloc( (2*i_dim+1) * sizeof( float ) );
  99 #endif
 100     int x;
 101     for( x = -i_dim; x <= i_dim; x++ )
 102     {
 103 #ifdef DONT_USE_FLOATS
 104         pi_distribution[i_dim+x] =
 105             (int)( sqrt( exp(-(x*x)/(f_sigma*f_sigma) )
 106                  / (2.*M_PI*f_sigma*f_sigma) )  * (double)(1<<8) );
 107         printf("%d\n",pi_distribution[i_dim+x]);
 108 #else
 109         pf_distribution[i_dim+x] = (float)
 110             sqrt( exp(-(x*x)/(f_sigma*f_sigma) ) / (2.*M_PI*f_sigma*f_sigma) );
 111         printf("%f\n",pf_distribution[i_dim+x]);
 112 #endif
 113     }
 114     p_sys->i_dim = i_dim;
 115 #ifdef DONT_USE_FLOATS
 116     p_sys->pi_distribution = pi_distribution;
 117 #else
 118     p_sys->pf_distribution = pf_distribution;
 119 #endif
 120 }
 121
 122 static int Create( vlc_object_t *p_this )
 123 {
 124     filter_t *p_filter = (filter_t *)p_this;
 125
 126     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 127        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 128        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 129        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 130
 131        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 132        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 133       )
 134     {
 135         /* We only want planar YUV 4:2:0 or 4:2:2 */
 136         msg_Err( p_filter, "Unsupported input chroma (%4s)",
 137                  (char*)&(p_filter->fmt_in.video.i_chroma) );
 138         return VLC_EGENERIC;
 139     }
 140
 141     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 142     {
 143         msg_Err( p_filter, "Input and output chromas don't match" );
 144         return VLC_EGENERIC;
 145     }
 146
 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
 154     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 155                        p_filter->p_cfg );
 156
 157     p_filter->pf_video_filter = Filter;
 158
 159     p_filter->p_sys->f_sigma =
 160         var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
 161     if( p_filter->p_sys->f_sigma <= 0. )
 162     {
 163         msg_Err( p_filter, "sigma must be positive" );
 164         return VLC_EGENERIC;
 165     }
 166     gaussianblur_InitDistribution( p_filter->p_sys );
 167     msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
 168              p_filter->p_sys->i_dim*2+1 );
 169 #ifdef DONT_USE_FLOATS
 170     p_filter->p_sys->pi_buffer = NULL;
 171     p_filter->p_sys->pi_scale = NULL;
 172 #else
 173     p_filter->p_sys->pf_buffer = NULL;
 174     p_filter->p_sys->pf_scale = NULL;
 175 #endif
 176
 177     return VLC_SUCCESS;
 178 }
 179
 180 static void Destroy( vlc_object_t *p_this )
 181 {
 182     filter_t *p_filter = (filter_t *)p_this;
 183 #ifdef DONT_USE_FLOATS
 184     free( p_filter->p_sys->pi_distribution );
 185     free( p_filter->p_sys->pi_buffer );
 186     free( p_filter->p_sys->pi_scale );
 187 #else
 188     free( p_filter->p_sys->pf_distribution );
 189     free( p_filter->p_sys->pf_buffer );
 190     free( p_filter->p_sys->pf_scale );
 191 #endif
 192     free( p_filter->p_sys );
 193 }
 194
 195 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 196 {
 197     picture_t *p_outpic;
 198     filter_sys_t *p_sys = p_filter->p_sys;
 199     int i_plane;
 200     const int i_dim = p_sys->i_dim;
 201 #ifdef DONT_USE_FLOATS
 202     int *pi_buffer;
 203     int *pi_scale;
 204     const int *pi_distribution = p_sys->pi_distribution;
 205 #else
 206     float *pf_buffer;
 207     float *pf_scale;
 208     const float *pf_distribution = p_sys->pf_distribution;
 209 #endif
 210     if( !p_pic ) return NULL;
 211
 212     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 213     if( !p_outpic )
 214     {
 215         msg_Warn( p_filter, "can't get output picture" );
 216         if( p_pic->pf_release )
 217             p_pic->pf_release( p_pic );
 218         return NULL;
 219     }
 220 #ifdef DONT_USE_FLOATS
 221     if( !p_sys->pi_buffer )
 222     {
 223         p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
 224                                           p_pic->p[Y_PLANE].i_visible_lines
 225                                           * p_pic->p[Y_PLANE].i_pitch
 226                                           * sizeof( int ) );
 227     }
 228     pi_buffer = p_sys->pi_buffer;
 229 #else
 230     if( !p_sys->pf_buffer )
 231     {
 232         p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
 233                                             p_pic->p[Y_PLANE].i_visible_lines
 234                                             * p_pic->p[Y_PLANE].i_pitch
 235                                             * sizeof( float ) );
 236     }
 237     pf_buffer = p_sys->pf_buffer;
 238 #endif
 239 #ifdef DONT_USE_FLOATS
 240     if( !p_sys->pi_scale )
 241 #else
 242     if( !p_sys->pf_scale )
 243 #endif
 244     {
 245         const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
 246         const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
 247         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 248         int i_col, i_line;
 249 #ifdef DONT_USE_FLOATS
 250         p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
 251                                         * sizeof( int ) );
 252         pi_scale = p_sys->pi_scale;
 253 #else
 254         p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
 255                                           * sizeof( float ) );
 256         pf_scale = p_sys->pf_scale;
 257 #endif
 258         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 259         {
 260             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 261             {
 262                 int x, y;
 263 #ifdef DONT_USE_FLOATS
 264                 int value = 0;
 265 #else
 266                 double value = 0.;
 267 #endif
 268                 for( y = __MAX( -i_dim, -i_line );
 269                      y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
 270                      y++ )
 271                 {
 272                     for( x = __MAX( -i_dim, -i_col );
 273                          x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
 274                          x++ )
 275                     {
 276 #ifdef DONT_USE_FLOATS
 277                         value += pi_distribution[y+i_dim]
 278                                * pi_distribution[x+i_dim];
 279 #else
 280                         value += ((double)pf_distribution[y+i_dim])
 281                                * ((double)pf_distribution[x+i_dim]);
 282 #endif
 283                     }
 284                 }
 285 #ifdef DONT_USE_FLOATS
 286                 pi_scale[i_line*i_pitch+i_col] = value;
 287 #else
 288                 pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
 289 #endif
 290             }
 291         }
 292     }
 293 #ifdef DONT_USE_FLOATS
 294     pi_scale = p_sys->pi_scale;
 295 #else
 296     pf_scale = p_sys->pf_scale;
 297 #endif
 298
 299     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 300     {
 301
 302         uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 303         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 304
 305         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 306         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 307         const int i_pitch = p_pic->p[i_plane].i_pitch;
 308
 309         int i_line, i_col;
 310         const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
 311         const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
 312
 313         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 314         {
 315             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 316             {
 317 #ifdef DONT_USE_FLOATS
 318                 int value = 0;
 319 #else
 320                 float value = 0.;
 321 #endif
 322                 int x;
 323                 const int c = i_line*i_pitch+i_col;
 324                 for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
 325                      x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
 326                      x++ )
 327                 {
 328 #ifdef DONT_USE_FLOATS
 329                     value += pi_distribution[x+i_dim]
 330                            * p_in[c+(x>>x_factor)];
 331 #else
 332                     value += pf_distribution[x+i_dim]
 333                            * (float)p_in[c+(x>>x_factor)];
 334 #endif
 335                 }
 336 #ifdef DONT_USE_FLOATS
 337                 pi_buffer[c] = value;
 338 #else
 339                 pf_buffer[c] = value;
 340 #endif
 341             }
 342         }
 343         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 344         {
 345             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 346             {
 347 #ifdef DONT_USE_FLOATS
 348                 int value = 0;
 349 #else
 350                 float value = 0.;
 351 #endif
 352                 int y;
 353                 const int c = i_line*i_pitch+i_col;
 354                 for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
 355                      y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
 356                      y++ )
 357                 {
 358 #ifdef DONT_USE_FLOATS
 359                     value += pi_distribution[y+i_dim]
 360                            * pi_buffer[c+(y>>y_factor)*i_pitch];
 361 #else
 362                     value += pf_distribution[y+i_dim]
 363                            * pf_buffer[c+(y>>y_factor)*i_pitch];
 364 #endif
 365                 }
 366 #ifdef DONT_USE_FLOATS
 367                 p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 368 #else
 369                 p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 370 #endif
 371             }
 372         }
 373     }
 374
 375     p_outpic->date = p_pic->date;
 376     p_outpic->b_force = p_pic->b_force;
 377     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 378     p_outpic->b_progressive = p_pic->b_progressive;
 379     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 380
 381     if( p_pic->pf_release )
 382         p_pic->pf_release( p_pic );
 383
 384     return p_outpic;
 385 }