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 <vlc_picture.h>
  39 #include "filter_picture.h"
  40
  41 /*****************************************************************************
  42  * Local protypes
  43  *****************************************************************************/
  44 static int  Create       ( vlc_object_t * );
  45 static void Destroy      ( vlc_object_t * );
  46 static picture_t *Filter ( filter_t *, picture_t * );
  47 static void RenderBlur   ( filter_sys_t *, picture_t *, picture_t * );
  48 static int MotionBlurCallback( vlc_object_t *, char const *,
  49                                vlc_value_t, vlc_value_t, void * );
  50
  51 /*****************************************************************************
  52  * Module descriptor
  53  *****************************************************************************/
  54 #define FACTOR_TEXT N_("Blur factor (1-127)")
  55 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
  56
  57 #define FILTER_PREFIX "blur-"
  58
  59 vlc_module_begin ()
  60     set_shortname( N_("Motion blur") )
  61     set_description( N_("Motion blur filter") )
  62     set_capability( "video filter", 0 )
  63     set_category( CAT_VIDEO )
  64     set_subcategory( SUBCAT_VIDEO_VFILTER )
  65
  66     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127,
  67                             FACTOR_TEXT, FACTOR_LONGTEXT, false )
  68
  69     add_shortcut( "blur" )
  70
  71     set_callbacks( Create, Destroy )
  72 vlc_module_end ()
  73
  74 static const char *const ppsz_filter_options[] = {
  75     "factor", NULL
  76 };
  77
  78 /*****************************************************************************
  79  * filter_sys_t
  80  *****************************************************************************/
  81 struct filter_sys_t
  82 {
  83     picture_t *p_tmp;
  84     bool      b_first;
  85     atomic_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     const vlc_chroma_description_t *p_chroma =
  96         vlc_fourcc_GetChromaDescription( p_filter->fmt_in.video.i_chroma );
  97     if( p_chroma == NULL || p_chroma->plane_count == 0 )
  98         return VLC_EGENERIC;
  99
 100     /* Allocate structure */
 101     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 102     if( p_filter->p_sys == NULL )
 103         return VLC_ENOMEM;
 104
 105     p_filter->p_sys->p_tmp = picture_NewFromFormat( &p_filter->fmt_in.video );
 106     if( !p_filter->p_sys->p_tmp )
 107     {
 108         free( p_filter->p_sys );
 109         return VLC_ENOMEM;
 110     }
 111     p_filter->p_sys->b_first = true;
 112
 113     p_filter->pf_video_filter = Filter;
 114
 115     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 116                        p_filter->p_cfg );
 117
 118     atomic_init( &p_filter->p_sys->i_factor,
 119              var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" ) );
 120     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 121                      MotionBlurCallback, p_filter->p_sys );
 122
 123
 124     return VLC_SUCCESS;
 125 }
 126
 127 /*****************************************************************************
 128  * Destroy
 129  *****************************************************************************/
 130 static void Destroy( vlc_object_t *p_this )
 131 {
 132     filter_t *p_filter = (filter_t *)p_this;
 133
 134     var_DelCallback( p_filter, FILTER_PREFIX "factor",
 135                      MotionBlurCallback, p_filter->p_sys );
 136
 137     picture_Release( p_filter->p_sys->p_tmp );
 138     free( p_filter->p_sys );
 139 }
 140
 141 /*****************************************************************************
 142  * Filter
 143  *****************************************************************************/
 144 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 145 {
 146     picture_t * p_outpic;
 147     filter_sys_t *p_sys = p_filter->p_sys;
 148
 149     if( !p_pic ) return NULL;
 150
 151     p_outpic = filter_NewPicture( p_filter );
 152     if( !p_outpic )
 153     {
 154         picture_Release( p_pic );
 155         return NULL;
 156     }
 157
 158     if( p_sys->b_first )
 159     {
 160         picture_CopyPixels( p_sys->p_tmp, p_pic );
 161         p_sys->b_first = false;
 162     }
 163
 164     /* Get a new picture */
 165     RenderBlur( p_sys, p_pic, p_outpic );
 166
 167     picture_CopyPixels( p_sys->p_tmp, p_outpic );
 168
 169     return CopyInfoAndRelease( p_outpic, p_pic );
 170 }
 171
 172 /*****************************************************************************
 173  * RenderBlur: renders a blurred picture
 174  *****************************************************************************/
 175 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 176                         picture_t *p_outpic )
 177 {
 178     const int i_oldfactor = atomic_load( &p_sys->i_factor );
 179     int i_newfactor = 128 - i_oldfactor;
 180
 181     for( int 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 }