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         change_safe();
  63
  64     set_callbacks( Create, Destroy );
  65 vlc_module_end();
  66
  67 static const char *ppsz_filter_options[] = {
  68     "sigma", NULL
  69 };
  70
  71 /* Comment this to use floats instead of integers (faster for bigger sigma
  72  * values)
  73  * For sigma = 2 ints are faster
  74  * For sigma = 4 floats are faster
  75  */
  76 #define DONT_USE_FLOATS
  77 struct filter_sys_t
  78 {
  79     double f_sigma;
  80     int i_dim;
  81 #ifdef DONT_USE_FLOATS
  82     int *pi_distribution;
  83     int *pi_buffer;
  84     int *pi_scale;
  85 #else
  86     float *pf_distribution;
  87     float *pf_buffer;
  88     float *pf_scale;
  89 #endif
  90 };
  91
  92 static void gaussianblur_InitDistribution( filter_sys_t *p_sys )
  93 {
  94     double f_sigma = p_sys->f_sigma;
  95     int i_dim = (int)(3.*f_sigma);
  96 #ifdef DONT_USE_FLOATS
  97     int *pi_distribution = (int*)malloc( (2*i_dim+1) * sizeof( int ) );
  98 #else
  99     float *pf_distribution = (float*)malloc( (2*i_dim+1) * sizeof( float ) );
 100 #endif
 101     int x;
 102     for( x = -i_dim; x <= i_dim; x++ )
 103     {
 104 #ifdef DONT_USE_FLOATS
 105         pi_distribution[i_dim+x] =
 106             (int)( sqrt( exp(-(x*x)/(f_sigma*f_sigma) )
 107                  / (2.*M_PI*f_sigma*f_sigma) )  * (double)(1<<8) );
 108         printf("%d\n",pi_distribution[i_dim+x]);
 109 #else
 110         pf_distribution[i_dim+x] = (float)
 111             sqrt( exp(-(x*x)/(f_sigma*f_sigma) ) / (2.*M_PI*f_sigma*f_sigma) );
 112         printf("%f\n",pf_distribution[i_dim+x]);
 113 #endif
 114     }
 115     p_sys->i_dim = i_dim;
 116 #ifdef DONT_USE_FLOATS
 117     p_sys->pi_distribution = pi_distribution;
 118 #else
 119     p_sys->pf_distribution = pf_distribution;
 120 #endif
 121 }
 122
 123 static int Create( vlc_object_t *p_this )
 124 {
 125     filter_t *p_filter = (filter_t *)p_this;
 126
 127     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 128        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 129        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 130        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 131
 132        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 133        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 134       )
 135     {
 136         /* We only want planar YUV 4:2:0 or 4:2:2 */
 137         msg_Err( p_filter, "Unsupported input chroma (%4s)",
 138                  (char*)&(p_filter->fmt_in.video.i_chroma) );
 139         return VLC_EGENERIC;
 140     }
 141
 142     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 143     {
 144         msg_Err( p_filter, "Input and output chromas don't match" );
 145         return VLC_EGENERIC;
 146     }
 147
 148     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 149     if( p_filter->p_sys == NULL )
 150     {
 151         msg_Err( p_filter, "out of memory" );
 152         return VLC_ENOMEM;
 153     }
 154
 155     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 156                        p_filter->p_cfg );
 157
 158     p_filter->pf_video_filter = Filter;
 159
 160     p_filter->p_sys->f_sigma =
 161         var_CreateGetFloat( p_filter, FILTER_PREFIX "sigma" );
 162     if( p_filter->p_sys->f_sigma <= 0. )
 163     {
 164         msg_Err( p_filter, "sigma must be positive" );
 165         return VLC_EGENERIC;
 166     }
 167     gaussianblur_InitDistribution( p_filter->p_sys );
 168     msg_Dbg( p_filter, "gaussian distribution is %d pixels wide",
 169              p_filter->p_sys->i_dim*2+1 );
 170 #ifdef DONT_USE_FLOATS
 171     p_filter->p_sys->pi_buffer = NULL;
 172     p_filter->p_sys->pi_scale = NULL;
 173 #else
 174     p_filter->p_sys->pf_buffer = NULL;
 175     p_filter->p_sys->pf_scale = NULL;
 176 #endif
 177
 178     return VLC_SUCCESS;
 179 }
 180
 181 static void Destroy( vlc_object_t *p_this )
 182 {
 183     filter_t *p_filter = (filter_t *)p_this;
 184 #ifdef DONT_USE_FLOATS
 185     free( p_filter->p_sys->pi_distribution );
 186     free( p_filter->p_sys->pi_buffer );
 187     free( p_filter->p_sys->pi_scale );
 188 #else
 189     free( p_filter->p_sys->pf_distribution );
 190     free( p_filter->p_sys->pf_buffer );
 191     free( p_filter->p_sys->pf_scale );
 192 #endif
 193     free( p_filter->p_sys );
 194 }
 195
 196 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 197 {
 198     picture_t *p_outpic;
 199     filter_sys_t *p_sys = p_filter->p_sys;
 200     int i_plane;
 201     const int i_dim = p_sys->i_dim;
 202 #ifdef DONT_USE_FLOATS
 203     int *pi_buffer;
 204     int *pi_scale;
 205     const int *pi_distribution = p_sys->pi_distribution;
 206 #else
 207     float *pf_buffer;
 208     float *pf_scale;
 209     const float *pf_distribution = p_sys->pf_distribution;
 210 #endif
 211     if( !p_pic ) return NULL;
 212
 213     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 214     if( !p_outpic )
 215     {
 216         msg_Warn( p_filter, "can't get output picture" );
 217         if( p_pic->pf_release )
 218             p_pic->pf_release( p_pic );
 219         return NULL;
 220     }
 221 #ifdef DONT_USE_FLOATS
 222     if( !p_sys->pi_buffer )
 223     {
 224         p_sys->pi_buffer = (int*)realloc( p_sys->pi_buffer,
 225                                           p_pic->p[Y_PLANE].i_visible_lines
 226                                           * p_pic->p[Y_PLANE].i_pitch
 227                                           * sizeof( int ) );
 228     }
 229     pi_buffer = p_sys->pi_buffer;
 230 #else
 231     if( !p_sys->pf_buffer )
 232     {
 233         p_sys->pf_buffer = (float*)realloc( p_sys->pf_buffer,
 234                                             p_pic->p[Y_PLANE].i_visible_lines
 235                                             * p_pic->p[Y_PLANE].i_pitch
 236                                             * sizeof( float ) );
 237     }
 238     pf_buffer = p_sys->pf_buffer;
 239 #endif
 240 #ifdef DONT_USE_FLOATS
 241     if( !p_sys->pi_scale )
 242 #else
 243     if( !p_sys->pf_scale )
 244 #endif
 245     {
 246         const int i_visible_lines = p_pic->p[Y_PLANE].i_visible_lines;
 247         const int i_visible_pitch = p_pic->p[Y_PLANE].i_visible_pitch;
 248         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 249         int i_col, i_line;
 250 #ifdef DONT_USE_FLOATS
 251         p_sys->pi_scale = (int*)malloc( i_visible_lines * i_pitch
 252                                         * sizeof( int ) );
 253         pi_scale = p_sys->pi_scale;
 254 #else
 255         p_sys->pf_scale = (float*)malloc( i_visible_lines * i_pitch
 256                                           * sizeof( float ) );
 257         pf_scale = p_sys->pf_scale;
 258 #endif
 259         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 260         {
 261             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 262             {
 263                 int x, y;
 264 #ifdef DONT_USE_FLOATS
 265                 int value = 0;
 266 #else
 267                 double value = 0.;
 268 #endif
 269                 for( y = __MAX( -i_dim, -i_line );
 270                      y <= __MIN( i_dim, i_visible_lines - i_line - 1 );
 271                      y++ )
 272                 {
 273                     for( x = __MAX( -i_dim, -i_col );
 274                          x <= __MIN( i_dim, i_visible_pitch - i_col + 1 );
 275                          x++ )
 276                     {
 277 #ifdef DONT_USE_FLOATS
 278                         value += pi_distribution[y+i_dim]
 279                                * pi_distribution[x+i_dim];
 280 #else
 281                         value += ((double)pf_distribution[y+i_dim])
 282                                * ((double)pf_distribution[x+i_dim]);
 283 #endif
 284                     }
 285                 }
 286 #ifdef DONT_USE_FLOATS
 287                 pi_scale[i_line*i_pitch+i_col] = value;
 288 #else
 289                 pf_scale[i_line*i_pitch+i_col] = (float)(1./value);
 290 #endif
 291             }
 292         }
 293     }
 294 #ifdef DONT_USE_FLOATS
 295     pi_scale = p_sys->pi_scale;
 296 #else
 297     pf_scale = p_sys->pf_scale;
 298 #endif
 299
 300     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 301     {
 302
 303         uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 304         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 305
 306         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 307         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 308         const int i_pitch = p_pic->p[i_plane].i_pitch;
 309
 310         int i_line, i_col;
 311         const int x_factor = p_pic->p[Y_PLANE].i_visible_pitch/i_visible_pitch-1;
 312         const int y_factor = p_pic->p[Y_PLANE].i_visible_lines/i_visible_lines-1;
 313
 314         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 315         {
 316             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 317             {
 318 #ifdef DONT_USE_FLOATS
 319                 int value = 0;
 320 #else
 321                 float value = 0.;
 322 #endif
 323                 int x;
 324                 const int c = i_line*i_pitch+i_col;
 325                 for( x = __MAX( -i_dim, -i_col*(x_factor+1) );
 326                      x <= __MIN( i_dim, (i_visible_pitch - i_col)*(x_factor+1) + 1 );
 327                      x++ )
 328                 {
 329 #ifdef DONT_USE_FLOATS
 330                     value += pi_distribution[x+i_dim]
 331                            * p_in[c+(x>>x_factor)];
 332 #else
 333                     value += pf_distribution[x+i_dim]
 334                            * (float)p_in[c+(x>>x_factor)];
 335 #endif
 336                 }
 337 #ifdef DONT_USE_FLOATS
 338                 pi_buffer[c] = value;
 339 #else
 340                 pf_buffer[c] = value;
 341 #endif
 342             }
 343         }
 344         for( i_line = 0 ; i_line < i_visible_lines ; i_line++ )
 345         {
 346             for( i_col = 0; i_col < i_visible_pitch ; i_col++ )
 347             {
 348 #ifdef DONT_USE_FLOATS
 349                 int value = 0;
 350 #else
 351                 float value = 0.;
 352 #endif
 353                 int y;
 354                 const int c = i_line*i_pitch+i_col;
 355                 for( y = __MAX( -i_dim, (-i_line)*(y_factor+1) );
 356                      y <= __MIN( i_dim, (i_visible_lines - i_line)*(y_factor+1) - 1 );
 357                      y++ )
 358                 {
 359 #ifdef DONT_USE_FLOATS
 360                     value += pi_distribution[y+i_dim]
 361                            * pi_buffer[c+(y>>y_factor)*i_pitch];
 362 #else
 363                     value += pf_distribution[y+i_dim]
 364                            * pf_buffer[c+(y>>y_factor)*i_pitch];
 365 #endif
 366                 }
 367 #ifdef DONT_USE_FLOATS
 368                 p_out[c] = (uint8_t)(value/pi_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 369 #else
 370                 p_out[c] = (uint8_t)(value*pf_scale[(i_line<<y_factor)*(i_pitch<<x_factor)+(i_col<<x_factor)]);
 371 #endif
 372             }
 373         }
 374     }
 375
 376     p_outpic->date = p_pic->date;
 377     p_outpic->b_force = p_pic->b_force;
 378     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 379     p_outpic->b_progressive = p_pic->b_progressive;
 380     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 381
 382     if( p_pic->pf_release )
 383         p_pic->pf_release( p_pic );
 384
 385     return p_outpic;
 386 }