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 #include <vlc_rand.h>
  35
  36 #include <vlc_filter.h>
  37 #include "filter_picture.h"
  38
  39 /*****************************************************************************
  40  * Local prototypes
  41  *****************************************************************************/
  42 static int  Create    ( vlc_object_t * );
  43 static void Destroy   ( vlc_object_t * );
  44
  45 static picture_t *Filter( filter_t *, picture_t * );
  46
  47 #define FILTER_PREFIX "grain-"
  48
  49 #define NOISE_HELP N_("add grain to image")
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 vlc_module_begin ()
  54     set_description( N_("Grain video filter") )
  55     set_shortname( N_( "Grain" ))
  56     set_help(NOISE_HELP)
  57     set_capability( "video filter2", 0 )
  58     set_category( CAT_VIDEO )
  59     set_subcategory( SUBCAT_VIDEO_VFILTER )
  60
  61     set_callbacks( Create, Destroy )
  62 vlc_module_end ()
  63
  64 struct filter_sys_t
  65 {
  66     int *p_noise;
  67 };
  68
  69 static int Create( vlc_object_t *p_this )
  70 {
  71     filter_t *p_filter = (filter_t *)p_this;
  72
  73     switch( p_filter->fmt_in.video.i_chroma )
  74     {
  75         CASE_PLANAR_YUV
  76             break;
  77
  78         default:
  79             msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
  80                      (char*)&(p_filter->fmt_in.video.i_chroma) );
  81             return VLC_EGENERIC;
  82     }
  83
  84     /* Allocate structure */
  85     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  86     if( p_filter->p_sys == NULL )
  87         return VLC_ENOMEM;
  88
  89     p_filter->pf_video_filter = Filter;
  90
  91     p_filter->p_sys->p_noise = NULL;
  92
  93     return VLC_SUCCESS;
  94 }
  95
  96 static void Destroy( vlc_object_t *p_this )
  97 {
  98     filter_t *p_filter = (filter_t *)p_this;
  99     free( p_filter->p_sys->p_noise );
 100     free( p_filter->p_sys );
 101 }
 102
 103 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 104 {
 105     picture_t *p_outpic;
 106     filter_sys_t *p_sys = p_filter->p_sys;
 107     int i_index;
 108
 109     if( !p_pic ) return NULL;
 110
 111     p_outpic = filter_NewPicture( p_filter );
 112     if( !p_outpic )
 113     {
 114         picture_Release( p_pic );
 115         return NULL;
 116     }
 117
 118     {
 119         uint8_t *p_in = p_pic->p[Y_PLANE].p_pixels;
 120         uint8_t *p_out = p_outpic->p[Y_PLANE].p_pixels;
 121
 122         const int i_num_lines = p_pic->p[Y_PLANE].i_visible_lines;
 123         const int i_num_cols = p_pic->p[Y_PLANE].i_visible_pitch;
 124         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 125
 126         int i_line, i_col;
 127
 128         int *p_noise = p_sys->p_noise;
 129         if( !p_noise )
 130         {
 131             p_noise = p_sys->p_noise =
 132                 (int*)malloc(i_pitch*i_num_lines*sizeof(int));
 133         }
 134
 135         for( i_line = 0; i_line < i_num_lines; i_line++ )
 136         {
 137             for( i_col = 0; i_col < i_num_cols; i_col++ )
 138             {
 139                 p_noise[i_line*i_pitch+i_col] = ((vlc_mrand48()&0x1f)-0x0f);
 140             }
 141         }
 142
 143         for( i_line = 2/*0*/ ; i_line < i_num_lines-2/**/; i_line++ )
 144         {
 145             for( i_col = 2/*0*/; i_col < i_num_cols/2; i_col++ )
 146             {
 147                 p_out[i_line*i_pitch+i_col] = clip_uint8_vlc(
 148                           p_in[i_line*i_pitch+i_col]
 149 #if 0
 150                         + p_noise[i_line*i_pitch+i_col] );
 151 #else
 152 /* 2 rows up */
 153               + ((  ( p_noise[(i_line-2)*i_pitch+i_col-2]<<1 )
 154               + ( p_noise[(i_line-2)*i_pitch+i_col-1]<<2 )
 155               + ( p_noise[(i_line-2)*i_pitch+i_col]<<2 )
 156               + ( p_noise[(i_line-2)*i_pitch+i_col+1]<<2 )
 157               + ( p_noise[(i_line-2)*i_pitch+i_col+2]<<1 )
 158               /* 1 row up */
 159               + ( p_noise[(i_line-1)*i_pitch+i_col-2]<<2 )
 160               + ( p_noise[(i_line-1)*i_pitch+i_col-1]<<3 )
 161               + ( p_noise[(i_line-1)*i_pitch+i_col]*12 )
 162               + ( p_noise[(i_line-1)*i_pitch+i_col+1]<<3 )
 163               + ( p_noise[(i_line-1)*i_pitch+i_col+2]<<2 )
 164               /* */
 165               + ( p_noise[i_line*i_pitch+i_col-2]<<2 )
 166               + ( p_noise[i_line*i_pitch+i_col-1]*12 )
 167               + ( p_noise[i_line*i_pitch+i_col]<<4 )
 168               + ( p_noise[i_line*i_pitch+i_col+1]*12 )
 169               + ( p_noise[i_line*i_pitch+i_col+2]<<2 )
 170               /* 1 row down */
 171               + ( p_noise[(i_line+1)*i_pitch+i_col-2]<<2 )
 172               + ( p_noise[(i_line+1)*i_pitch+i_col-1]<<3 )
 173               + ( p_noise[(i_line+1)*i_pitch+i_col]*12 )
 174               + ( p_noise[(i_line+1)*i_pitch+i_col+1]<<3 )
 175               + ( p_noise[(i_line+1)*i_pitch+i_col+2]<<2 )
 176               /* 2 rows down */
 177               + ( p_noise[(i_line+2)*i_pitch+i_col-2]<<1 )
 178               + ( p_noise[(i_line+2)*i_pitch+i_col-1]<<2 )
 179               + ( p_noise[(i_line+2)*i_pitch+i_col]<<2 )
 180               + ( p_noise[(i_line+2)*i_pitch+i_col+1]<<2 )
 181               + ( p_noise[(i_line+2)*i_pitch+i_col+2]<<1 )
 182               )>>7/*/152*/));
 183 #endif
 184
 185             }
 186             for( ; i_col < i_num_cols; i_col++ )
 187                 p_out[i_line*i_pitch+i_col] = p_in[i_line*i_pitch+i_col];
 188         }
 189     }
 190
 191     for( i_index = 1; i_index < p_pic->i_planes; i_index++ )
 192     {
 193         uint8_t *p_in = p_pic->p[i_index].p_pixels;
 194         uint8_t *p_out = p_outpic->p[i_index].p_pixels;
 195
 196         const int i_lines = p_pic->p[i_index].i_lines;
 197         const int i_pitch = p_pic->p[i_index].i_pitch;
 198
 199         vlc_memcpy( p_out, p_in, i_lines * i_pitch );
 200
 201     }
 202
 203     return CopyInfoAndRelease( p_outpic, p_pic );
 204 }