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/vlc.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_vout.h>
  35
  36 #include "vlc_filter.h"
  37
  38 #include <math.h>                                          /* exp(), sqrt() */
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  Create    ( vlc_object_t * );
  44 static void Destroy   ( vlc_object_t * );
  45
  46 static picture_t *Filter( filter_t *, picture_t * );
  47
  48 #define SIGMA_TEXT N_("Gaussian's std deviation")
  49 #define SIGMA_LONGTEXT N_( \
  50     "Gaussian's standard deviation. The bluring will take " \
  51     "into account pixels up to 3*sigma away in any direction.")
  52
  53 #define FILTER_PREFIX "gaussianblur-"
  54
  55 /*****************************************************************************
  56  * Module descriptor
  57  *****************************************************************************/
  58 vlc_module_begin();
  59     set_description( _("Gaussian blur video filter") );
  60     set_shortname( _( "Gaussian Blur" ));
  61     set_capability( "video filter2", 0 );
  62     set_category( CAT_VIDEO );
  63     set_subcategory( SUBCAT_VIDEO_VFILTER );
  64
  65     add_float( FILTER_PREFIX "sigma", 2., NULL, SIGMA_TEXT, SIGMA_LONGTEXT,
  66                false );
  67
  68     set_callbacks( Create, Destroy );
  69 vlc_module_end();
  70
  71 static const char *ppsz_filter_options[] = {
  72     "sigma", NULL
  73 };
  74
  75 /* Comment this to use floats instead of integers (faster for bigger sigma
  76  * values)
  77  * For sigma = 2 ints are faster
  78  * For sigma = 4 floats are faster
  79  */
  80 #define DONT_USE_FLOATS
  81 struct filter_sys_t
  82 {
  83     double f_sigma;
  84     int i_dim;
  85 #ifdef DONT_USE_FLOATS
  86     int *pi_distribution;
  87     int *pi_buffer;
  88     int *pi_scale;
  89 #else
  90     float *pf_distribution;
  91     float *pf_buffer;
  92     float *pf_scale;
  93 #endif
  94 };
  95
  96 static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
  97 {
  98     double f_sigma = p_sys->f_sigma;
  99     int i_dim = (int)(3.*f_sigma);
 100 #ifdef DONT_USE_FLOATS
 101     int *pi_distribution = (int*)malloc( (2*i_dim+1) * sizeof( int ) );
 102 #else
 103     float *pf_distribution = (float*)malloc( (2*i_dim+1) * sizeof( float ) );
 104 #endif
 105     int x;
 106     for( x = -i_dim; x <= i_dim; x++ )
 107     {
 108 #ifdef DONT_USE_FLOATS
 109         pi_distribution[i_dim+x] =
 110             (int)( sqrt( exp(-(x*x)/(f_sigma*f_sigma) )
 111                  / (2.*M_PI*f_sigma*f_sigma) )  * (double)(1<<8) );
 112         printf("%d\n",pi_distribution[i_dim+x]);
 113 #else
 114         pf_distribution[i_dim+x] = (float)
 115             sqrt( exp(-(x*x)/(f_sigma*f_sigma) ) / (2.*M_PI*f_sigma*f_sigma) );
 116         printf("%f\n",pf_distribution[i_dim+x]);
 117 #endif
 118     }
 119     p_sys->i_dim = i_dim;
 120 #ifdef DONT_USE_FLOATS
 121     p_sys->pi_distribution = pi_distribution;
 122 #else
 123     p_sys->pf_distribution = pf_distribution;
 124 #endif
 125 }
 126
 127 static int Create( vlc_object_t *p_this )
 128 {
 129     filter_t *p_filter = (filter_t *)p_this;
 130
 131     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 132        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 133        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 134        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 135
 136        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 137        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 138       )
 139     {
 140         /* We only want planar YUV 4:2:0 or 4:2:2 */
 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     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 147     {
 148         msg_Err( p_filter, "Input and output chromas don't match" );
 149         return VLC_EGENERIC;
 150     }
 151
 152     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 153     if( p_filter->p_sys == NULL )
 154     {
 155         msg_Err( p_filter, "out of memory" );
 156         return VLC_ENOMEM;
 157     }
 158
 159     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 160                        p_filter->p_cfg );
 161
 162     p_filter->pf_video_filter = Filter;
 163
 164     p_filter->p_sys->f_sigma =
 165         var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
 166     if( p_filter->p_sys->f_sigma <= 0. )
 167     {
 168         msg_Err( p_filter, "sigma must be positive" );
 169         return VLC_EGENERIC;
 170     }
 171     gaussianblur_InitDistribution( p_filter->p_sys );
 172     msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
 173              p_filter->p_sys->i_dim*2+1 );
 174 #ifdef DONT_USE_FLOATS
 175     p_filter->p_sys->pi_buffer = NULL;
 176     p_filter->p_sys->pi_scale = NULL;
 177 #else
 178     p_filter->p_sys->pf_buffer = NULL;
 179     p_filter->p_sys->pf_scale = NULL;
 180 #endif
 181
 182     return VLC_SUCCESS;
 183 }
 184
 185 static void Destroy( vlc_object_t *p_this )
 186 {
 187     filter_t *p_filter = (filter_t *)p_this;
 188 #ifdef DONT_USE_FLOATS
 189     free( p_filter->p_sys->pi_distribution );
 190     free( p_filter->p_sys->pi_buffer );
 191     free( p_filter->p_sys->pi_scale );
 192 #else
 193     free( p_filter->p_sys->pf_distribution );
 194     free( p_filter->p_sys->pf_buffer );
 195     free( p_filter->p_sys->pf_scale );
 196 #endif
 197     free( p_filter->p_sys );
 198 }
 199
 200 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 201 {
 202     picture_t *p_outpic;
 203     filter_sys_t *p_sys = p_filter->p_sys;
 204     int i_plane;
 205     const int i_dim = p_sys->i_dim;
 206 #ifdef DONT_USE_FLOATS
 207     int *pi_buffer;
 208     int *pi_scale;
 209     const int *pi_distribution = p_sys->pi_distribution;
 210 #else
 211     float *pf_buffer;
 212     float *pf_scale;
 213     const float *pf_distribution = p_sys->pf_distribution;
 214 #endif
 215     if( !p_pic ) return NULL;
 216
 217     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 218     if( !p_outpic )
 219     {
 220         msg_Warn( p_filter, "can't get output picture" );
 221         if( p_pic->pf_release )
 222             p_pic->pf_release( p_pic );
 223         return NULL;
 224     }
 225 #ifdef DONT_USE_FLOATS
 226     if( !p_sys->pi_buffer )
 227     {
 228         p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
 229                                           p_pic->p[Y_PLANE].i_visible_lines
 230                                           * p_pic->p[Y_PLANE].i_pitch
 231                                           * sizeof( int ) );
 232     }
 233     pi_buffer = p_sys->pi_buffer;
 234 #else
 235     if( !p_sys->pf_buffer )
 236     {
 237         p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
 238                                             p_pic->p[Y_PLANE].i_visible_lines
 239                                             * p_pic->p[Y_PLANE].i_pitch
 240                                             * sizeof( float ) );
 241     }
 242     pf_buffer = p_sys->pf_buffer;
 243 #endif
 244 #ifdef DONT_USE_FLOATS
 245     if( !p_sys->pi_scale )
 246 #else
 247     if( !p_sys->pf_scale )
 248 #endif
 249     {
 250         const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
 251         const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
 252         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 253         int i_col, i_line;
 254 #ifdef DONT_USE_FLOATS
 255         p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
 256                                         * sizeof( int ) );
 257         pi_scale = p_sys->pi_scale;
 258 #else
 259         p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
 260                                           * sizeof( float ) );
 261         pf_scale = p_sys->pf_scale;
 262 #endif
 263         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 264         {
 265             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 266             {
 267                 int x, y;
 268 #ifdef DONT_USE_FLOATS
 269                 int value = 0;
 270 #else
 271                 double value = 0.;
 272 #endif
 273                 for( y = __MAX( -i_dim, -i_line );
 274                      y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
 275                      y++ )
 276                 {
 277                     for( x = __MAX( -i_dim, -i_col );
 278                          x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
 279                          x++ )
 280                     {
 281 #ifdef DONT_USE_FLOATS
 282                         value += pi_distribution[y+i_dim]
 283                                * pi_distribution[x+i_dim];
 284 #else
 285                         value += ((double)pf_distribution[y+i_dim])
 286                                * ((double)pf_distribution[x+i_dim]);
 287 #endif
 288                     }
 289                 }
 290 #ifdef DONT_USE_FLOATS
 291                 pi_scale[i_line*i_pitch+i_col] = value;
 292 #else
 293                 pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
 294 #endif
 295             }
 296         }
 297     }
 298 #ifdef DONT_USE_FLOATS
 299     pi_scale = p_sys->pi_scale;
 300 #else
 301     pf_scale = p_sys->pf_scale;
 302 #endif
 303
 304     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 305     {
 306
 307         uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 308         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 309
 310         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 311         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 312         const int i_pitch = p_pic->p[i_plane].i_pitch;
 313
 314         int i_line, i_col;
 315         const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
 316         const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
 317
 318         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 319         {
 320             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 321             {
 322 #ifdef DONT_USE_FLOATS
 323                 int value = 0;
 324 #else
 325                 float value = 0.;
 326 #endif
 327                 int x;
 328                 const int c = i_line*i_pitch+i_col;
 329                 for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
 330                      x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
 331                      x++ )
 332                 {
 333 #ifdef DONT_USE_FLOATS
 334                     value += pi_distribution[x+i_dim]
 335                            * p_in[c+(x>>x_factor)];
 336 #else
 337                     value += pf_distribution[x+i_dim]
 338                            * (float)p_in[c+(x>>x_factor)];
 339 #endif
 340                 }
 341 #ifdef DONT_USE_FLOATS
 342                 pi_buffer[c] = value;
 343 #else
 344                 pf_buffer[c] = value;
 345 #endif
 346             }
 347         }
 348         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 349         {
 350             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 351             {
 352 #ifdef DONT_USE_FLOATS
 353                 int value = 0;
 354 #else
 355                 float value = 0.;
 356 #endif
 357                 int y;
 358                 const int c = i_line*i_pitch+i_col;
 359                 for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
 360                      y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
 361                      y++ )
 362                 {
 363 #ifdef DONT_USE_FLOATS
 364                     value += pi_distribution[y+i_dim]
 365                            * pi_buffer[c+(y>>y_factor)*i_pitch];
 366 #else
 367                     value += pf_distribution[y+i_dim]
 368                            * pf_buffer[c+(y>>y_factor)*i_pitch];
 369 #endif
 370                 }
 371 #ifdef DONT_USE_FLOATS
 372                 p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 373 #else
 374                 p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 375 #endif
 376             }
 377         }
 378     }
 379
 380     p_outpic->date = p_pic->date;
 381     p_outpic->b_force = p_pic->b_force;
 382     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 383     p_outpic->b_progressive = p_pic->b_progressive;
 384     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 385
 386     if( p_pic->pf_release )
 387         p_pic->pf_release( p_pic );
 388
 389     return p_outpic;
 390 }