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     {
 156         msg_Err( p_filter, "out of memory" );
 157         return VLC_ENOMEM;
 158     }
 159
 160     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 161                        p_filter->p_cfg );
 162
 163     p_filter->pf_video_filter = Filter;
 164
 165     p_filter->p_sys->f_sigma =
 166         var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
 167     if( p_filter->p_sys->f_sigma <= 0. )
 168     {
 169         msg_Err( p_filter, "sigma must be positive" );
 170         return VLC_EGENERIC;
 171     }
 172     gaussianblur_InitDistribution( p_filter->p_sys );
 173     msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
 174              p_filter->p_sys->i_dim*2+1 );
 175 #ifdef DONT_USE_FLOATS
 176     p_filter->p_sys->pi_buffer = NULL;
 177     p_filter->p_sys->pi_scale = NULL;
 178 #else
 179     p_filter->p_sys->pf_buffer = NULL;
 180     p_filter->p_sys->pf_scale = NULL;
 181 #endif
 182
 183     return VLC_SUCCESS;
 184 }
 185
 186 static void Destroy( vlc_object_t *p_this )
 187 {
 188     filter_t *p_filter = (filter_t *)p_this;
 189 #ifdef DONT_USE_FLOATS
 190     free( p_filter->p_sys->pi_distribution );
 191     free( p_filter->p_sys->pi_buffer );
 192     free( p_filter->p_sys->pi_scale );
 193 #else
 194     free( p_filter->p_sys->pf_distribution );
 195     free( p_filter->p_sys->pf_buffer );
 196     free( p_filter->p_sys->pf_scale );
 197 #endif
 198     free( p_filter->p_sys );
 199 }
 200
 201 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 202 {
 203     picture_t *p_outpic;
 204     filter_sys_t *p_sys = p_filter->p_sys;
 205     int i_plane;
 206     const int i_dim = p_sys->i_dim;
 207 #ifdef DONT_USE_FLOATS
 208     int *pi_buffer;
 209     int *pi_scale;
 210     const int *pi_distribution = p_sys->pi_distribution;
 211 #else
 212     float *pf_buffer;
 213     float *pf_scale;
 214     const float *pf_distribution = p_sys->pf_distribution;
 215 #endif
 216     if( !p_pic ) return NULL;
 217
 218     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 219     if( !p_outpic )
 220     {
 221         msg_Warn( p_filter, "can't get output picture" );
 222         if( p_pic->pf_release )
 223             p_pic->pf_release( p_pic );
 224         return NULL;
 225     }
 226 #ifdef DONT_USE_FLOATS
 227     if( !p_sys->pi_buffer )
 228     {
 229         p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
 230                                           p_pic->p[Y_PLANE].i_visible_lines
 231                                           * p_pic->p[Y_PLANE].i_pitch
 232                                           * sizeof( int ) );
 233     }
 234     pi_buffer = p_sys->pi_buffer;
 235 #else
 236     if( !p_sys->pf_buffer )
 237     {
 238         p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
 239                                             p_pic->p[Y_PLANE].i_visible_lines
 240                                             * p_pic->p[Y_PLANE].i_pitch
 241                                             * sizeof( float ) );
 242     }
 243     pf_buffer = p_sys->pf_buffer;
 244 #endif
 245 #ifdef DONT_USE_FLOATS
 246     if( !p_sys->pi_scale )
 247 #else
 248     if( !p_sys->pf_scale )
 249 #endif
 250     {
 251         const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
 252         const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
 253         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 254         int i_col, i_line;
 255 #ifdef DONT_USE_FLOATS
 256         p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
 257                                         * sizeof( int ) );
 258         pi_scale = p_sys->pi_scale;
 259 #else
 260         p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
 261                                           * sizeof( float ) );
 262         pf_scale = p_sys->pf_scale;
 263 #endif
 264         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 265         {
 266             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 267             {
 268                 int x, y;
 269 #ifdef DONT_USE_FLOATS
 270                 int value = 0;
 271 #else
 272                 double value = 0.;
 273 #endif
 274                 for( y = __MAX( -i_dim, -i_line );
 275                      y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
 276                      y++ )
 277                 {
 278                     for( x = __MAX( -i_dim, -i_col );
 279                          x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
 280                          x++ )
 281                     {
 282 #ifdef DONT_USE_FLOATS
 283                         value += pi_distribution[y+i_dim]
 284                                * pi_distribution[x+i_dim];
 285 #else
 286                         value += ((double)pf_distribution[y+i_dim])
 287                                * ((double)pf_distribution[x+i_dim]);
 288 #endif
 289                     }
 290                 }
 291 #ifdef DONT_USE_FLOATS
 292                 pi_scale[i_line*i_pitch+i_col] = value;
 293 #else
 294                 pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
 295 #endif
 296             }
 297         }
 298     }
 299 #ifdef DONT_USE_FLOATS
 300     pi_scale = p_sys->pi_scale;
 301 #else
 302     pf_scale = p_sys->pf_scale;
 303 #endif
 304
 305     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 306     {
 307
 308         uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 309         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 310
 311         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 312         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 313         const int i_pitch = p_pic->p[i_plane].i_pitch;
 314
 315         int i_line, i_col;
 316         const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
 317         const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
 318
 319         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 320         {
 321             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 322             {
 323 #ifdef DONT_USE_FLOATS
 324                 int value = 0;
 325 #else
 326                 float value = 0.;
 327 #endif
 328                 int x;
 329                 const int c = i_line*i_pitch+i_col;
 330                 for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
 331                      x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
 332                      x++ )
 333                 {
 334 #ifdef DONT_USE_FLOATS
 335                     value += pi_distribution[x+i_dim]
 336                            * p_in[c+(x>>x_factor)];
 337 #else
 338                     value += pf_distribution[x+i_dim]
 339                            * (float)p_in[c+(x>>x_factor)];
 340 #endif
 341                 }
 342 #ifdef DONT_USE_FLOATS
 343                 pi_buffer[c] = value;
 344 #else
 345                 pf_buffer[c] = value;
 346 #endif
 347             }
 348         }
 349         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 350         {
 351             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 352             {
 353 #ifdef DONT_USE_FLOATS
 354                 int value = 0;
 355 #else
 356                 float value = 0.;
 357 #endif
 358                 int y;
 359                 const int c = i_line*i_pitch+i_col;
 360                 for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
 361                      y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
 362                      y++ )
 363                 {
 364 #ifdef DONT_USE_FLOATS
 365                     value += pi_distribution[y+i_dim]
 366                            * pi_buffer[c+(y>>y_factor)*i_pitch];
 367 #else
 368                     value += pf_distribution[y+i_dim]
 369                            * pf_buffer[c+(y>>y_factor)*i_pitch];
 370 #endif
 371                 }
 372 #ifdef DONT_USE_FLOATS
 373                 p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 374 #else
 375                 p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 376 #endif
 377             }
 378         }
 379     }
 380
 381     return CopyInfoAndRelease( p_outpic, p_pic );
 382 }