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 #include <string.h>
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_vout.h>
  31
  32 #include "vlc_filter.h"
  33
  34 /*****************************************************************************
  35  * Local prototypes
  36  *****************************************************************************/
  37 static int  Create    ( vlc_object_t * );
  38 static void Destroy   ( vlc_object_t * );
  39
  40 static picture_t *Filter( filter_t *, picture_t * );
  41
  42 #define FILTER_PREFIX "grain-"
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47 vlc_module_begin();
  48     set_description( _("Grain video filter") );
  49     set_shortname( _( "Grain" ));
  50     set_capability( "video filter2", 0 );
  51     set_category( CAT_VIDEO );
  52     set_subcategory( SUBCAT_VIDEO_VFILTER );
  53
  54     set_callbacks( Create, Destroy );
  55 vlc_module_end();
  56
  57 static const char *ppsz_filter_options[] = {
  58     NULL
  59 };
  60
  61 struct filter_sys_t
  62 {
  63     int *p_noise;
  64 };
  65
  66 static int Create( vlc_object_t *p_this )
  67 {
  68     filter_t *p_filter = (filter_t *)p_this;
  69
  70     /* FIXME: check that chroma is YUV based */
  71
  72     /* Allocate structure */
  73     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  74     if( p_filter->p_sys == NULL )
  75     {
  76         msg_Err( p_filter, "out of memory" );
  77         return VLC_ENOMEM;
  78     }
  79
  80     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
  81                        p_filter->p_cfg );
  82
  83     p_filter->pf_video_filter = Filter;
  84
  85     p_filter->p_sys->p_noise = NULL;
  86
  87     return VLC_SUCCESS;
  88 }
  89
  90 static void Destroy( vlc_object_t *p_this )
  91 {
  92     filter_t *p_filter = (filter_t *)p_this;
  93     free( p_filter->p_sys->p_noise );
  94     free( p_filter->p_sys );
  95 }
  96
  97 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  98 {
  99     picture_t *p_outpic;
 100     filter_sys_t *p_sys = p_filter->p_sys;
 101     int i_index;
 102
 103     if( !p_pic ) return NULL;
 104
 105     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 106     if( !p_outpic )
 107     {
 108         msg_Warn( p_filter, "can't get output picture" );
 109         if( p_pic->pf_release )
 110             p_pic->pf_release( p_pic );
 111         return NULL;
 112     }
 113
 114     {
 115         uint8_t *p_in = p_pic->p[Y_PLANE].p_pixels;
 116         uint8_t *p_out = p_outpic->p[Y_PLANE].p_pixels;
 117
 118         const int i_num_lines = p_pic->p[Y_PLANE].i_visible_lines;
 119         const int i_num_cols = p_pic->p[Y_PLANE].i_visible_pitch;
 120         const int i_pitch = p_pic->p[Y_PLANE].i_pitch;
 121
 122         int i_line, i_col;
 123
 124         int *p_noise = p_sys->p_noise;
 125         if( !p_noise )
 126         {
 127             p_noise = p_sys->p_noise =
 128                 (int*)malloc(i_pitch*i_num_lines*sizeof(int));
 129         }
 130
 131         for( i_line = 0; i_line < i_num_lines; i_line++ )
 132         {
 133             for( i_col = 0; i_col < i_num_cols; i_col++ )
 134             {
 135                 p_noise[i_line*i_pitch+i_col] = ((rand()&0x1f)-0x0f);
 136             }
 137         }
 138
 139         for( i_line = 2/*0*/ ; i_line < i_num_lines-2/**/; i_line++ )
 140         {
 141             for( i_col = 2/*0*/; i_col < i_num_cols/2; i_col++ )
 142             {
 143                 p_out[i_line*i_pitch+i_col] = clip_uint8_vlc(
 144                           p_in[i_line*i_pitch+i_col]
 145 #if 0
 146                         + p_noise[i_line*i_pitch+i_col] );
 147 #else
 148 /* 2 rows up */
 149               + ((  ( p_noise[(i_line-2)*i_pitch+i_col-2]<<1 )
 150               + ( p_noise[(i_line-2)*i_pitch+i_col-1]<<2 )
 151               + ( p_noise[(i_line-2)*i_pitch+i_col]<<2 )
 152               + ( p_noise[(i_line-2)*i_pitch+i_col+1]<<2 )
 153               + ( p_noise[(i_line-2)*i_pitch+i_col+2]<<1 )
 154               /* 1 row up */
 155               + ( p_noise[(i_line-1)*i_pitch+i_col-2]<<2 )
 156               + ( p_noise[(i_line-1)*i_pitch+i_col-1]<<3 )
 157               + ( p_noise[(i_line-1)*i_pitch+i_col]*12 )
 158               + ( p_noise[(i_line-1)*i_pitch+i_col+1]<<3 )
 159               + ( p_noise[(i_line-1)*i_pitch+i_col+2]<<2 )
 160               /* */
 161               + ( p_noise[i_line*i_pitch+i_col-2]<<2 )
 162               + ( p_noise[i_line*i_pitch+i_col-1]*12 )
 163               + ( p_noise[i_line*i_pitch+i_col]<<4 )
 164               + ( p_noise[i_line*i_pitch+i_col+1]*12 )
 165               + ( p_noise[i_line*i_pitch+i_col+2]<<2 )
 166               /* 1 row down */
 167               + ( p_noise[(i_line+1)*i_pitch+i_col-2]<<2 )
 168               + ( p_noise[(i_line+1)*i_pitch+i_col-1]<<3 )
 169               + ( p_noise[(i_line+1)*i_pitch+i_col]*12 )
 170               + ( p_noise[(i_line+1)*i_pitch+i_col+1]<<3 )
 171               + ( p_noise[(i_line+1)*i_pitch+i_col+2]<<2 )
 172               /* 2 rows down */
 173               + ( p_noise[(i_line+2)*i_pitch+i_col-2]<<1 )
 174               + ( p_noise[(i_line+2)*i_pitch+i_col-1]<<2 )
 175               + ( p_noise[(i_line+2)*i_pitch+i_col]<<2 )
 176               + ( p_noise[(i_line+2)*i_pitch+i_col+1]<<2 )
 177               + ( p_noise[(i_line+2)*i_pitch+i_col+2]<<1 )
 178               )>>7/*/152*/));
 179 #endif
 180
 181             }
 182             for( ; i_col < i_num_cols; i_col++ )
 183                 p_out[i_line*i_pitch+i_col] = p_in[i_line*i_pitch+i_col];
 184         }
 185     }
 186
 187     for( i_index = 1; i_index < p_pic->i_planes; i_index++ )
 188     {
 189         uint8_t *p_in = p_pic->p[i_index].p_pixels;
 190         uint8_t *p_out = p_outpic->p[i_index].p_pixels;
 191
 192         const int i_lines = p_pic->p[i_index].i_lines;
 193         const int i_pitch = p_pic->p[i_index].i_pitch;
 194
 195         p_filter->p_libvlc->pf_memcpy( p_out, p_in, i_lines * i_pitch );
 196
 197     }
 198
 199     p_outpic->date = p_pic->date;
 200     p_outpic->b_force = p_pic->b_force;
 201     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 202     p_outpic->b_progressive = p_pic->b_progressive;
 203     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 204
 205     if( p_pic->pf_release )
 206         p_pic->pf_release( p_pic );
 207
 208     return p_outpic;
 209 }