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

   1 /*****************************************************************************
   2  * motion_blur.c : motion blur filter for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001, 2002, 2003 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
   8  *          Antoine Cellerier <dionoea &t videolan d.t org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_sout.h>
  36 #include <vlc_filter.h>
  37 #include "filter_picture.h"
  38
  39 /*****************************************************************************
  40  * Local protypes
  41  *****************************************************************************/
  42 static int  Create       ( vlc_object_t * );
  43 static void Destroy      ( vlc_object_t * );
  44 static picture_t *Filter ( filter_t *, picture_t * );
  45 static void RenderBlur   ( filter_sys_t *, picture_t *, picture_t * );
  46 static void Copy         ( filter_t *, picture_t * );
  47 static int MotionBlurCallback( vlc_object_t *, char const *,
  48                                vlc_value_t, vlc_value_t, void * );
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 #define FACTOR_TEXT N_("Blur factor (1-127)")
  54 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
  55
  56 #define FILTER_PREFIX "blur-"
  57
  58 vlc_module_begin ()
  59     set_shortname( N_("Motion blur") )
  60     set_description( N_("Motion blur filter") )
  61     set_capability( "video filter2", 0 )
  62     set_category( CAT_VIDEO )
  63     set_subcategory( SUBCAT_VIDEO_VFILTER )
  64
  65     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
  66                             FACTOR_TEXT, FACTOR_LONGTEXT, false )
  67
  68     add_shortcut( "blur" )
  69
  70     set_callbacks( Create, Destroy )
  71 vlc_module_end ()
  72
  73 static const char *const ppsz_filter_options[] = {
  74     "factor", NULL
  75 };
  76
  77 /*****************************************************************************
  78  * filter_sys_t
  79  *****************************************************************************/
  80 struct filter_sys_t
  81 {
  82     int        i_factor;
  83
  84     uint8_t  **pp_planes;
  85     int        i_planes;
  86 };
  87
  88 /*****************************************************************************
  89  * Create
  90  *****************************************************************************/
  91 static int Create( vlc_object_t *p_this )
  92 {
  93     filter_t *p_filter = (filter_t *)p_this;
  94
  95     /* Allocate structure */
  96     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  97     if( p_filter->p_sys == NULL )
  98         return VLC_ENOMEM;
  99
 100     p_filter->pf_video_filter = Filter;
 101
 102     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 103                        p_filter->p_cfg );
 104
 105     p_filter->p_sys->i_factor =
 106         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 107     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 108                      MotionBlurCallback, p_filter->p_sys );
 109
 110     p_filter->p_sys->pp_planes = NULL;
 111     p_filter->p_sys->i_planes = 0;
 112
 113     return VLC_SUCCESS;
 114 }
 115
 116 /*****************************************************************************
 117  * Destroy
 118  *****************************************************************************/
 119 static void Destroy( vlc_object_t *p_this )
 120 {
 121     filter_t *p_filter = (filter_t *)p_this;
 122
 123     while( p_filter->p_sys->i_planes-- )
 124         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 125     free( p_filter->p_sys->pp_planes );
 126     free( p_filter->p_sys );
 127 }
 128
 129 /*****************************************************************************
 130  * Filter
 131  *****************************************************************************/
 132 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 133 {
 134     picture_t * p_outpic;
 135     filter_sys_t *p_sys = p_filter->p_sys;
 136
 137     if( !p_pic ) return NULL;
 138
 139     p_outpic = filter_NewPicture( p_filter );
 140     if( !p_outpic )
 141     {
 142         picture_Release( p_pic );
 143         return NULL;
 144     }
 145
 146     if( !p_sys->pp_planes )
 147     {
 148         /* initialise our picture buffer */
 149         int i_plane;
 150         p_sys->i_planes = p_pic->i_planes;
 151         p_sys->pp_planes =
 152             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 153         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 154         {
 155             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 156                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 157         }
 158         Copy( p_filter, p_pic );
 159     }
 160
 161     /* Get a new picture */
 162     RenderBlur( p_sys, p_pic, p_outpic );
 163     Copy( p_filter, p_outpic );
 164
 165     return CopyInfoAndRelease( p_outpic, p_pic );
 166 }
 167
 168 /*****************************************************************************
 169  * RenderBlur: renders a blurred picture
 170  *****************************************************************************/
 171 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 172                         picture_t *p_outpic )
 173 {
 174     int i_plane;
 175     int i_oldfactor = p_sys->i_factor;
 176     int i_newfactor = 128 - i_oldfactor;
 177     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 178     {
 179         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 180         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 181         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 182         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 183
 184         p_out = p_outpic->p[i_plane].p_pixels;
 185         p_new = p_newpic->p[i_plane].p_pixels;
 186         p_old = p_sys->pp_planes[i_plane];
 187         p_out_end = p_out + i_pitch * i_visible_lines;
 188         while ( p_out < p_out_end )
 189         {
 190             p_out_line_end = p_out + i_visible_pitch;
 191
 192             while ( p_out < p_out_line_end )
 193             {
 194                 *p_out++ = (((*p_old++) * i_oldfactor) +
 195                             ((*p_new++) * i_newfactor)) >> 7;
 196             }
 197
 198             p_old += i_pitch - i_visible_pitch;
 199             p_new += i_pitch - i_visible_pitch;
 200             p_out += i_pitch - i_visible_pitch;
 201         }
 202     }
 203 }
 204
 205 static void Copy( filter_t *p_filter, picture_t *p_pic )
 206 {
 207     int i_plane;
 208     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 209     {
 210         vlc_memcpy(
 211             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 212             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 213     }
 214 }
 215
 216 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 217                                vlc_value_t oldval, vlc_value_t newval,
 218                                void *p_data )
 219 {
 220     VLC_UNUSED(p_this); VLC_UNUSED(oldval);
 221     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 222     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 223         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 224     return VLC_SUCCESS;
 225 }