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

   1 /*****************************************************************************
   2  * noise.c : "add grain to image" 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
  35 #include <vlc_filter.h>
  36 #include "filter_picture.h"
  37
  38 /*****************************************************************************
  39  * Local prototypes
  40  *****************************************************************************/
  41 static int  Create    ( vlc_object_t * );
  42 static void Destroy   ( vlc_object_t * );
  43
  44 static picture_t *Filter( filter_t *, picture_t * );
  45
  46 #define FILTER_PREFIX "grain-"
  47
  48 #define NOISE_HELP N_("add grain to image")
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52 vlc_module_begin ()
  53     set_description( N_("Grain video filter") )
  54     set_shortname( N_( "Grain" ))
  55     set_help(NOISE_HELP)
  56     set_capability( "video filter2", 0 )
  57     set_category( CAT_VIDEO )
  58     set_subcategory( SUBCAT_VIDEO_VFILTER )
  59
  60     set_callbacks( Create, Destroy )
  61 vlc_module_end ()
  62
  63 struct filter_sys_t
  64 {
  65     int *p_noise;
  66 };
  67
  68 static int Create( vlc_object_t *p_this )
  69 {
  70     filter_t *p_filter = (filter_t *)p_this;
  71
  72     switch( p_filter->fmt_in.video.i_chroma )
  73     {
  74         CASE_PLANAR_YUV
  75             break;
  76
  77         default:
  78             msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
  79                      (char*)&(p_filter->fmt_in.video.i_chroma) );
  80             return VLC_EGENERIC;
  81     }
  82
  83     /* Allocate structure */
  84     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  85     if( p_filter->p_sys == NULL )
  86         return VLC_ENOMEM;
  87
  88     p_filter->pf_video_filter = Filter;
  89
  90     p_filter->p_sys->p_noise = NULL;
  91
  92     return VLC_SUCCESS;
  93 }
  94
  95 static void Destroy( vlc_object_t *p_this )
  96 {
  97     filter_t *p_filter = (filter_t *)p_this;
  98     free( p_filter->p_sys->p_noise );
  99     free( p_filter->p_sys );
 100 }
 101
 102 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 103 {
 104     picture_t *p_outpic;
 105     filter_sys_t *p_sys = p_filter->p_sys;
 106     int i_index;
 107
 108     if( !p_pic ) return NULL;
 109
 110     p_outpic = filter_NewPicture( p_filter );
 111     if( !p_outpic )
 112     {
 113         picture_Release( p_pic );
 114         return NULL;
 115     }
 116
 117     {
 118         uint8_t *p_in = p_pic->p[Y_PLANE].p_pixels;
 119         uint8_t *p_out = p_outpic->p[Y_PLANE].p_pixels;
 120
 121         const int i_num_lines = p_pic->p[Y_PLANE].i_visible_lines;
 122         const int i_num_cols = p_pic->p[Y_PLANE].i_visible_pitch;
 123         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 124
 125         int i_line, i_col;
 126
 127         int *p_noise = p_sys->p_noise;
 128         if( !p_noise )
 129         {
 130             p_noise = p_sys->p_noise =
 131                 (int*)malloc(i_pitch*i_num_lines*sizeof(int));
 132         }
 133
 134         for( i_line = 0; i_line < i_num_lines; i_line++ )
 135         {
 136             for( i_col = 0; i_col < i_num_cols; i_col++ )
 137             {
 138                 p_noise[i_line*i_pitch+i_col] = ((rand()&0x1f)-0x0f);
 139             }
 140         }
 141
 142         for( i_line = 2/*0*/ ; i_line < i_num_lines-2/**/; i_line++ )
 143         {
 144             for( i_col = 2/*0*/; i_col < i_num_cols/2; i_col++ )
 145             {
 146                 p_out[i_line*i_pitch+i_col] = clip_uint8_vlc(
 147                           p_in[i_line*i_pitch+i_col]
 148 #if 0
 149                         + p_noise[i_line*i_pitch+i_col] );
 150 #else
 151 /* 2 rows up */
 152               + ((  ( p_noise[(i_line-2)*i_pitch+i_col-2]<<1 )
 153               + ( p_noise[(i_line-2)*i_pitch+i_col-1]<<2 )
 154               + ( p_noise[(i_line-2)*i_pitch+i_col]<<2 )
 155               + ( p_noise[(i_line-2)*i_pitch+i_col+1]<<2 )
 156               + ( p_noise[(i_line-2)*i_pitch+i_col+2]<<1 )
 157               /* 1 row up */
 158               + ( p_noise[(i_line-1)*i_pitch+i_col-2]<<2 )
 159               + ( p_noise[(i_line-1)*i_pitch+i_col-1]<<3 )
 160               + ( p_noise[(i_line-1)*i_pitch+i_col]*12 )
 161               + ( p_noise[(i_line-1)*i_pitch+i_col+1]<<3 )
 162               + ( p_noise[(i_line-1)*i_pitch+i_col+2]<<2 )
 163               /* */
 164               + ( p_noise[i_line*i_pitch+i_col-2]<<2 )
 165               + ( p_noise[i_line*i_pitch+i_col-1]*12 )
 166               + ( p_noise[i_line*i_pitch+i_col]<<4 )
 167               + ( p_noise[i_line*i_pitch+i_col+1]*12 )
 168               + ( p_noise[i_line*i_pitch+i_col+2]<<2 )
 169               /* 1 row down */
 170               + ( p_noise[(i_line+1)*i_pitch+i_col-2]<<2 )
 171               + ( p_noise[(i_line+1)*i_pitch+i_col-1]<<3 )
 172               + ( p_noise[(i_line+1)*i_pitch+i_col]*12 )
 173               + ( p_noise[(i_line+1)*i_pitch+i_col+1]<<3 )
 174               + ( p_noise[(i_line+1)*i_pitch+i_col+2]<<2 )
 175               /* 2 rows down */
 176               + ( p_noise[(i_line+2)*i_pitch+i_col-2]<<1 )
 177               + ( p_noise[(i_line+2)*i_pitch+i_col-1]<<2 )
 178               + ( p_noise[(i_line+2)*i_pitch+i_col]<<2 )
 179               + ( p_noise[(i_line+2)*i_pitch+i_col+1]<<2 )
 180               + ( p_noise[(i_line+2)*i_pitch+i_col+2]<<1 )
 181               )>>7/*/152*/));
 182 #endif
 183
 184             }
 185             for( ; i_col < i_num_cols; i_col++ )
 186                 p_out[i_line*i_pitch+i_col] = p_in[i_line*i_pitch+i_col];
 187         }
 188     }
 189
 190     for( i_index = 1; i_index < p_pic->i_planes; i_index++ )
 191     {
 192         uint8_t *p_in = p_pic->p[i_index].p_pixels;
 193         uint8_t *p_out = p_outpic->p[i_index].p_pixels;
 194
 195         const int i_lines = p_pic->p[i_index].i_lines;
 196         const int i_pitch = p_pic->p[i_index].i_pitch;
 197
 198         vlc_memcpy( p_out, p_in, i_lines * i_pitch );
 199
 200     }
 201
 202     return CopyInfoAndRelease( p_outpic, p_pic );
 203 }