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     const vlc_chroma_description_t *p_chroma =
  95         vlc_fourcc_GetChromaDescription( p_filter->fmt_in.video.i_chroma );
  96     if( p_chroma == NULL || p_chroma->plane_count == 0 )
  97         return VLC_EGENERIC;
  98
  99     /* Allocate structure */
 100     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 101     if( p_filter->p_sys == NULL )
 102         return VLC_ENOMEM;
 103
 104     p_filter->p_sys->p_tmp = picture_NewFromFormat( &p_filter->fmt_in.video );
 105     if( !p_filter->p_sys->p_tmp )
 106     {
 107         free( p_filter->p_sys );
 108         return VLC_ENOMEM;
 109     }
 110     p_filter->p_sys->b_first = true;
 111
 112     p_filter->pf_video_filter = Filter;
 113
 114     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 115                        p_filter->p_cfg );
 116
 117     atomic_init( &p_filter->p_sys->i_factor,
 118              var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" ) );
 119     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 120                      MotionBlurCallback, p_filter->p_sys );
 121
 122
 123     return VLC_SUCCESS;
 124 }
 125
 126 /*****************************************************************************
 127  * Destroy
 128  *****************************************************************************/
 129 static void Destroy( vlc_object_t *p_this )
 130 {
 131     filter_t *p_filter = (filter_t *)p_this;
 132
 133     var_DelCallback( p_filter, FILTER_PREFIX "factor",
 134                      MotionBlurCallback, p_filter->p_sys );
 135
 136     picture_Release( p_filter->p_sys->p_tmp );
 137     free( p_filter->p_sys );
 138 }
 139
 140 /*****************************************************************************
 141  * Filter
 142  *****************************************************************************/
 143 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 144 {
 145     picture_t * p_outpic;
 146     filter_sys_t *p_sys = p_filter->p_sys;
 147
 148     if( !p_pic ) return NULL;
 149
 150     p_outpic = filter_NewPicture( p_filter );
 151     if( !p_outpic )
 152     {
 153         picture_Release( p_pic );
 154         return NULL;
 155     }
 156
 157     if( p_sys->b_first )
 158     {
 159         picture_CopyPixels( p_sys->p_tmp, p_pic );
 160         p_sys->b_first = false;
 161     }
 162
 163     /* Get a new picture */
 164     RenderBlur( p_sys, p_pic, p_outpic );
 165
 166     picture_CopyPixels( p_sys->p_tmp, p_outpic );
 167
 168     return CopyInfoAndRelease( p_outpic, p_pic );
 169 }
 170
 171 /*****************************************************************************
 172  * RenderBlur: renders a blurred picture
 173  *****************************************************************************/
 174 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 175                         picture_t *p_outpic )
 176 {
 177     int i_plane;
 178     const int i_oldfactor = atomic_load( &p_sys->i_factor );
 179     int i_newfactor = 128 - i_oldfactor;
 180
 181     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 182     {
 183         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 184         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 185         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 186
 187         p_out = p_outpic->p[i_plane].p_pixels;
 188         p_new = p_newpic->p[i_plane].p_pixels;
 189         p_old = p_sys->p_tmp->p[i_plane].p_pixels;
 190         p_out_end = p_out + p_outpic->p[i_plane].i_pitch * i_visible_lines;
 191         while ( p_out < p_out_end )
 192         {
 193             p_out_line_end = p_out + i_visible_pitch;
 194
 195             while ( p_out < p_out_line_end )
 196             {
 197                 *p_out++ = (((*p_old++) * i_oldfactor) +
 198                             ((*p_new++) * i_newfactor)) >> 7;
 199             }
 200
 201             p_old += p_sys->p_tmp->p[i_plane].i_pitch - i_visible_pitch;
 202             p_new += p_newpic->p[i_plane].i_pitch     - i_visible_pitch;
 203             p_out += p_outpic->p[i_plane].i_pitch     - i_visible_pitch;
 204         }
 205     }
 206 }
 207
 208 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 209                                vlc_value_t oldval, vlc_value_t newval,
 210                                void *p_data )
 211 {
 212     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 213     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 214
 215     atomic_store( &p_sys->i_factor, VLC_CLIP( newval.i_int, 1, 127 ) );
 216     return VLC_SUCCESS;
 217 }