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 int MotionBlurCallback( vlc_object_t *, char const *,
  47                                vlc_value_t, vlc_value_t, void * );
  48
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52 #define FACTOR_TEXT N_("Blur factor (1-127)")
  53 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
  54
  55 #define FILTER_PREFIX "blur-"
  56
  57 vlc_module_begin ()
  58     set_shortname( N_("Motion blur") )
  59     set_description( N_("Motion blur filter") )
  60     set_capability( "video filter2", 0 )
  61     set_category( CAT_VIDEO )
  62     set_subcategory( SUBCAT_VIDEO_VFILTER )
  63
  64     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
  65                             FACTOR_TEXT, FACTOR_LONGTEXT, false )
  66
  67     add_shortcut( "blur" )
  68
  69     set_callbacks( Create, Destroy )
  70 vlc_module_end ()
  71
  72 static const char *const ppsz_filter_options[] = {
  73     "factor", NULL
  74 };
  75
  76 /*****************************************************************************
  77  * filter_sys_t
  78  *****************************************************************************/
  79 struct filter_sys_t
  80 {
  81     picture_t *p_tmp;
  82     bool      b_first;
  83
  84     vlc_spinlock_t lock;
  85     int        i_factor;
  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->p_sys->p_tmp = picture_NewFromFormat( &p_filter->fmt_in.video );
 101     if( !p_filter->p_sys->p_tmp )
 102     {
 103         free( p_filter->p_sys );
 104         return VLC_ENOMEM;
 105     }
 106     p_filter->p_sys->b_first = true;
 107
 108     p_filter->pf_video_filter = Filter;
 109
 110     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 111                        p_filter->p_cfg );
 112
 113     p_filter->p_sys->i_factor =
 114         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 115     vlc_spin_init( &p_filter->p_sys->lock );
 116     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 117                      MotionBlurCallback, p_filter->p_sys );
 118
 119
 120     return VLC_SUCCESS;
 121 }
 122
 123 /*****************************************************************************
 124  * Destroy
 125  *****************************************************************************/
 126 static void Destroy( vlc_object_t *p_this )
 127 {
 128     filter_t *p_filter = (filter_t *)p_this;
 129
 130     var_DelCallback( p_filter, FILTER_PREFIX "factor",
 131                      MotionBlurCallback, p_filter->p_sys );
 132     vlc_spin_destroy( &p_filter->p_sys->lock );
 133
 134     picture_Release( p_filter->p_sys->p_tmp );
 135     free( p_filter->p_sys );
 136 }
 137
 138 /*****************************************************************************
 139  * Filter
 140  *****************************************************************************/
 141 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 142 {
 143     picture_t * p_outpic;
 144     filter_sys_t *p_sys = p_filter->p_sys;
 145
 146     if( !p_pic ) return NULL;
 147
 148     p_outpic = filter_NewPicture( p_filter );
 149     if( !p_outpic )
 150     {
 151         picture_Release( p_pic );
 152         return NULL;
 153     }
 154
 155     if( p_sys->b_first )
 156     {
 157         picture_CopyPixels( p_sys->p_tmp, p_pic );
 158         p_sys->b_first = false;
 159     }
 160
 161     /* Get a new picture */
 162     RenderBlur( p_sys, p_pic, p_outpic );
 163
 164     picture_CopyPixels( p_sys->p_tmp, p_outpic );
 165
 166     return CopyInfoAndRelease( p_outpic, p_pic );
 167 }
 168
 169 /*****************************************************************************
 170  * RenderBlur: renders a blurred picture
 171  *****************************************************************************/
 172 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 173                         picture_t *p_outpic )
 174 {
 175     int i_plane;
 176     vlc_spin_lock( &p_sys->lock );
 177     const int i_oldfactor = p_sys->i_factor;
 178     vlc_spin_unlock( &p_sys->lock );
 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(oldval);
 213     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 214
 215     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 216     {
 217         vlc_spin_lock( &p_sys->lock );
 218         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 219         vlc_spin_unlock( &p_sys->lock );
 220     }
 221     return VLC_SUCCESS;
 222 }