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 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_vout.h>
  35
  36 #include "vlc_filter.h"
  37 #include "filter_picture.h"
  38
  39 #include <math.h>                                          /* exp(), sqrt() */
  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
  49 #define SIGMA_TEXT N_("Gaussian's std deviation")
  50 #define SIGMA_LONGTEXT N_( \
  51     "Gaussian's standard deviation. The bluring will take " \
  52     "into account pixels up to 3*sigma away in any direction.")
  53
  54 #define FILTER_PREFIX "gaussianblur-"
  55
  56 /*****************************************************************************
  57  * Module descriptor
  58  *****************************************************************************/
  59 vlc_module_begin();
  60     set_description( N_("Gaussian blur video filter") );
  61     set_shortname( N_( "Gaussian Blur" ));
  62     set_capability( "video filter2", 0 );
  63     set_category( CAT_VIDEO );
  64     set_subcategory( SUBCAT_VIDEO_VFILTER );
  65
  66     add_float( FILTER_PREFIX "sigma", 2., NULL, SIGMA_TEXT, SIGMA_LONGTEXT,
  67                false );
  68
  69     set_callbacks( Create, Destroy );
  70 vlc_module_end();
  71
  72 static const char *const ppsz_filter_options[] = {
  73     "sigma", NULL
  74 };
  75
  76 /* Comment this to use floats instead of integers (faster for bigger sigma
  77  * values)
  78  * For sigma = 2 ints are faster
  79  * For sigma = 4 floats are faster
  80  */
  81 #define DONT_USE_FLOATS
  82 struct filter_sys_t
  83 {
  84     double f_sigma;
  85     int i_dim;
  86 #ifdef DONT_USE_FLOATS
  87     int *pi_distribution;
  88     int *pi_buffer;
  89     int *pi_scale;
  90 #else
  91     float *pf_distribution;
  92     float *pf_buffer;
  93     float *pf_scale;
  94 #endif
  95 };
  96
  97 static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
  98 {
  99     double f_sigma = p_sys->f_sigma;
 100     int i_dim = (int)(3.*f_sigma);
 101 #ifdef DONT_USE_FLOATS
 102     int *pi_distribution = (int*)malloc( (2*i_dim+1) * sizeof( int ) );
 103 #else
 104     float *pf_distribution = (float*)malloc( (2*i_dim+1) * sizeof( float ) );
 105 #endif
 106     int x;
 107     for( x = -i_dim; x <= i_dim; x++ )
 108     {
 109 #ifdef DONT_USE_FLOATS
 110         pi_distribution[i_dim+x] =
 111             (int)( sqrt( exp(-(x*x)/(f_sigma*f_sigma) )
 112                  / (2.*M_PI*f_sigma*f_sigma) )  * (double)(1<<8) );
 113         printf("%d\n",pi_distribution[i_dim+x]);
 114 #else
 115         pf_distribution[i_dim+x] = (float)
 116             sqrt( exp(-(x*x)/(f_sigma*f_sigma) ) / (2.*M_PI*f_sigma*f_sigma) );
 117         printf("%f\n",pf_distribution[i_dim+x]);
 118 #endif
 119     }
 120     p_sys->i_dim = i_dim;
 121 #ifdef DONT_USE_FLOATS
 122     p_sys->pi_distribution = pi_distribution;
 123 #else
 124     p_sys->pf_distribution = pf_distribution;
 125 #endif
 126 }
 127
 128 static int Create( vlc_object_t *p_this )
 129 {
 130     filter_t *p_filter = (filter_t *)p_this;
 131
 132     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 133        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 134        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 135        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 136
 137        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 138        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 139       )
 140     {
 141         /* We only want planar YUV 4:2:0 or 4:2:2 */
 142         msg_Err( p_filter, "Unsupported input chroma (%4s)",
 143                  (char*)&(p_filter->fmt_in.video.i_chroma) );
 144         return VLC_EGENERIC;
 145     }
 146
 147     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 148     {
 149         msg_Err( p_filter, "Input and output chromas don't match" );
 150         return VLC_EGENERIC;
 151     }
 152
 153     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 154     if( p_filter->p_sys == NULL )
 155         return VLC_ENOMEM;
 156
 157     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 158                        p_filter->p_cfg );
 159
 160     p_filter->pf_video_filter = Filter;
 161
 162     p_filter->p_sys->f_sigma =
 163         var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
 164     if( p_filter->p_sys->f_sigma <= 0. )
 165     {
 166         msg_Err( p_filter, "sigma must be positive" );
 167         return VLC_EGENERIC;
 168     }
 169     gaussianblur_InitDistribution( p_filter->p_sys );
 170     msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
 171              p_filter->p_sys->i_dim*2+1 );
 172 #ifdef DONT_USE_FLOATS
 173     p_filter->p_sys->pi_buffer = NULL;
 174     p_filter->p_sys->pi_scale = NULL;
 175 #else
 176     p_filter->p_sys->pf_buffer = NULL;
 177     p_filter->p_sys->pf_scale = NULL;
 178 #endif
 179
 180     return VLC_SUCCESS;
 181 }
 182
 183 static void Destroy( vlc_object_t *p_this )
 184 {
 185     filter_t *p_filter = (filter_t *)p_this;
 186 #ifdef DONT_USE_FLOATS
 187     free( p_filter->p_sys->pi_distribution );
 188     free( p_filter->p_sys->pi_buffer );
 189     free( p_filter->p_sys->pi_scale );
 190 #else
 191     free( p_filter->p_sys->pf_distribution );
 192     free( p_filter->p_sys->pf_buffer );
 193     free( p_filter->p_sys->pf_scale );
 194 #endif
 195     free( p_filter->p_sys );
 196 }
 197
 198 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 199 {
 200     picture_t *p_outpic;
 201     filter_sys_t *p_sys = p_filter->p_sys;
 202     int i_plane;
 203     const int i_dim = p_sys->i_dim;
 204 #ifdef DONT_USE_FLOATS
 205     int *pi_buffer;
 206     int *pi_scale;
 207     const int *pi_distribution = p_sys->pi_distribution;
 208 #else
 209     float *pf_buffer;
 210     float *pf_scale;
 211     const float *pf_distribution = p_sys->pf_distribution;
 212 #endif
 213     if( !p_pic ) return NULL;
 214
 215     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 216     if( !p_outpic )
 217     {
 218         msg_Warn( p_filter, "can't get output picture" );
 219         picture_Release( p_pic );
 220         return NULL;
 221     }
 222 #ifdef DONT_USE_FLOATS
 223     if( !p_sys->pi_buffer )
 224     {
 225         p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
 226                                           p_pic->p[Y_PLANE].i_visible_lines
 227                                           * p_pic->p[Y_PLANE].i_pitch
 228                                           * sizeof( int ) );
 229     }
 230     pi_buffer = p_sys->pi_buffer;
 231 #else
 232     if( !p_sys->pf_buffer )
 233     {
 234         p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
 235                                             p_pic->p[Y_PLANE].i_visible_lines
 236                                             * p_pic->p[Y_PLANE].i_pitch
 237                                             * sizeof( float ) );
 238     }
 239     pf_buffer = p_sys->pf_buffer;
 240 #endif
 241 #ifdef DONT_USE_FLOATS
 242     if( !p_sys->pi_scale )
 243 #else
 244     if( !p_sys->pf_scale )
 245 #endif
 246     {
 247         const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
 248         const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
 249         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 250         int i_col, i_line;
 251 #ifdef DONT_USE_FLOATS
 252         p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
 253                                         * sizeof( int ) );
 254         pi_scale = p_sys->pi_scale;
 255 #else
 256         p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
 257                                           * sizeof( float ) );
 258         pf_scale = p_sys->pf_scale;
 259 #endif
 260         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 261         {
 262             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 263             {
 264                 int x, y;
 265 #ifdef DONT_USE_FLOATS
 266                 int value = 0;
 267 #else
 268                 double value = 0.;
 269 #endif
 270                 for( y = __MAX( -i_dim, -i_line );
 271                      y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
 272                      y++ )
 273                 {
 274                     for( x = __MAX( -i_dim, -i_col );
 275                          x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
 276                          x++ )
 277                     {
 278 #ifdef DONT_USE_FLOATS
 279                         value += pi_distribution[y+i_dim]
 280                                * pi_distribution[x+i_dim];
 281 #else
 282                         value += ((double)pf_distribution[y+i_dim])
 283                                * ((double)pf_distribution[x+i_dim]);
 284 #endif
 285                     }
 286                 }
 287 #ifdef DONT_USE_FLOATS
 288                 pi_scale[i_line*i_pitch+i_col] = value;
 289 #else
 290                 pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
 291 #endif
 292             }
 293         }
 294     }
 295 #ifdef DONT_USE_FLOATS
 296     pi_scale = p_sys->pi_scale;
 297 #else
 298     pf_scale = p_sys->pf_scale;
 299 #endif
 300
 301     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 302     {
 303
 304         uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 305         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 306
 307         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 308         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 309         const int i_pitch = p_pic->p[i_plane].i_pitch;
 310
 311         int i_line, i_col;
 312         const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
 313         const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
 314
 315         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 316         {
 317             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 318             {
 319 #ifdef DONT_USE_FLOATS
 320                 int value = 0;
 321 #else
 322                 float value = 0.;
 323 #endif
 324                 int x;
 325                 const int c = i_line*i_pitch+i_col;
 326                 for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
 327                      x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
 328                      x++ )
 329                 {
 330 #ifdef DONT_USE_FLOATS
 331                     value += pi_distribution[x+i_dim]
 332                            * p_in[c+(x>>x_factor)];
 333 #else
 334                     value += pf_distribution[x+i_dim]
 335                            * (float)p_in[c+(x>>x_factor)];
 336 #endif
 337                 }
 338 #ifdef DONT_USE_FLOATS
 339                 pi_buffer[c] = value;
 340 #else
 341                 pf_buffer[c] = value;
 342 #endif
 343             }
 344         }
 345         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 346         {
 347             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 348             {
 349 #ifdef DONT_USE_FLOATS
 350                 int value = 0;
 351 #else
 352                 float value = 0.;
 353 #endif
 354                 int y;
 355                 const int c = i_line*i_pitch+i_col;
 356                 for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
 357                      y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
 358                      y++ )
 359                 {
 360 #ifdef DONT_USE_FLOATS
 361                     value += pi_distribution[y+i_dim]
 362                            * pi_buffer[c+(y>>y_factor)*i_pitch];
 363 #else
 364                     value += pf_distribution[y+i_dim]
 365                            * pf_buffer[c+(y>>y_factor)*i_pitch];
 366 #endif
 367                 }
 368 #ifdef DONT_USE_FLOATS
 369                 p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 370 #else
 371                 p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 372 #endif
 373             }
 374         }
 375     }
 376
 377     return CopyInfoAndRelease( p_outpic, p_pic );
 378 }