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