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

   1 /*****************************************************************************
   2  * motionblur.c : motion blur filter for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001, 2002, 2003 VLC authors and VideoLAN
   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 it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * 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 <vlc_atomic.h>
  38 #include "filter_picture.h"
  39
  40 /*****************************************************************************
  41  * Local protypes
  42  *****************************************************************************/
  43 static int  Create       ( vlc_object_t * );
  44 static void Destroy      ( vlc_object_t * );
  45 static picture_t *Filter ( filter_t *, picture_t * );
  46 static void RenderBlur   ( filter_sys_t *, picture_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,
  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     picture_t *p_tmp;
  83     bool      b_first;
  84     atomic_int i_factor;
  85 };
  86
  87 /*****************************************************************************
  88  * Create
  89  *****************************************************************************/
  90 static int Create( vlc_object_t *p_this )
  91 {
  92     filter_t *p_filter = (filter_t *)p_this;
  93
  94     /* Allocate structure */
  95     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  96     if( p_filter->p_sys == NULL )
  97         return VLC_ENOMEM;
  98
  99     p_filter->p_sys->p_tmp = picture_NewFromFormat( &p_filter->fmt_in.video );
 100     if( !p_filter->p_sys->p_tmp )
 101     {
 102         free( p_filter->p_sys );
 103         return VLC_ENOMEM;
 104     }
 105     p_filter->p_sys->b_first = true;
 106
 107     p_filter->pf_video_filter = Filter;
 108
 109     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 110                        p_filter->p_cfg );
 111
 112     atomic_init( &p_filter->p_sys->i_factor,
 113              var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" ) );
 114     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 115                      MotionBlurCallback, p_filter->p_sys );
 116
 117
 118     return VLC_SUCCESS;
 119 }
 120
 121 /*****************************************************************************
 122  * Destroy
 123  *****************************************************************************/
 124 static void Destroy( vlc_object_t *p_this )
 125 {
 126     filter_t *p_filter = (filter_t *)p_this;
 127
 128     var_DelCallback( p_filter, FILTER_PREFIX "factor",
 129                      MotionBlurCallback, p_filter->p_sys );
 130
 131     picture_Release( p_filter->p_sys->p_tmp );
 132     free( p_filter->p_sys );
 133 }
 134
 135 /*****************************************************************************
 136  * Filter
 137  *****************************************************************************/
 138 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 139 {
 140     picture_t * p_outpic;
 141     filter_sys_t *p_sys = p_filter->p_sys;
 142
 143     if( !p_pic ) return NULL;
 144
 145     p_outpic = filter_NewPicture( p_filter );
 146     if( !p_outpic )
 147     {
 148         picture_Release( p_pic );
 149         return NULL;
 150     }
 151
 152     if( p_sys->b_first )
 153     {
 154         picture_CopyPixels( p_sys->p_tmp, p_pic );
 155         p_sys->b_first = false;
 156     }
 157
 158     /* Get a new picture */
 159     RenderBlur( p_sys, p_pic, p_outpic );
 160
 161     picture_CopyPixels( p_sys->p_tmp, p_outpic );
 162
 163     return CopyInfoAndRelease( p_outpic, p_pic );
 164 }
 165
 166 /*****************************************************************************
 167  * RenderBlur: renders a blurred picture
 168  *****************************************************************************/
 169 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 170                         picture_t *p_outpic )
 171 {
 172     int i_plane;
 173     const int i_oldfactor = atomic_load( &p_sys->i_factor );
 174     int i_newfactor = 128 - i_oldfactor;
 175
 176     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 177     {
 178         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 179         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 180         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 181
 182         p_out = p_outpic->p[i_plane].p_pixels;
 183         p_new = p_newpic->p[i_plane].p_pixels;
 184         p_old = p_sys->p_tmp->p[i_plane].p_pixels;
 185         p_out_end = p_out + p_outpic->p[i_plane].i_pitch * i_visible_lines;
 186         while ( p_out < p_out_end )
 187         {
 188             p_out_line_end = p_out + i_visible_pitch;
 189
 190             while ( p_out < p_out_line_end )
 191             {
 192                 *p_out++ = (((*p_old++) * i_oldfactor) +
 193                             ((*p_new++) * i_newfactor)) >> 7;
 194             }
 195
 196             p_old += p_sys->p_tmp->p[i_plane].i_pitch - i_visible_pitch;
 197             p_new += p_newpic->p[i_plane].i_pitch     - i_visible_pitch;
 198             p_out += p_outpic->p[i_plane].i_pitch     - i_visible_pitch;
 199         }
 200     }
 201 }
 202
 203 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 204                                vlc_value_t oldval, vlc_value_t newval,
 205                                void *p_data )
 206 {
 207     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 208     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 209
 210     atomic_store( &p_sys->i_factor, VLC_CLIP( newval.i_int, 1, 127 ) );
 211     return VLC_SUCCESS;
 212 }