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_vout.h>
  37 #include <vlc_filter.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 void Copy         ( filter_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 filter2", 0 );
  63     set_category( CAT_VIDEO );
  64     set_subcategory( SUBCAT_VIDEO_VFILTER );
  65
  66     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
  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     int        i_factor;
  84
  85     uint8_t  **pp_planes;
  86     int        i_planes;
  87 };
  88
  89 /*****************************************************************************
  90  * Create
  91  *****************************************************************************/
  92 static int Create( vlc_object_t *p_this )
  93 {
  94     filter_t *p_filter = (filter_t *)p_this;
  95
  96     /* Allocate structure */
  97     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  98     if( p_filter->p_sys == NULL )
  99     {
 100         msg_Err( p_filter, "out of memory" );
 101         return VLC_ENOMEM;
 102     }
 103
 104     p_filter->pf_video_filter = Filter;
 105
 106     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 107                        p_filter->p_cfg );
 108
 109     p_filter->p_sys->i_factor =
 110         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 111     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 112                      MotionBlurCallback, p_filter->p_sys );
 113
 114     p_filter->p_sys->pp_planes = NULL;
 115     p_filter->p_sys->i_planes = 0;
 116
 117     return VLC_SUCCESS;
 118 }
 119
 120 /*****************************************************************************
 121  * Destroy
 122  *****************************************************************************/
 123 static void Destroy( vlc_object_t *p_this )
 124 {
 125     filter_t *p_filter = (filter_t *)p_this;
 126
 127     while( p_filter->p_sys->i_planes-- )
 128         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 129     free( p_filter->p_sys->pp_planes );
 130     free( p_filter->p_sys );
 131 }
 132
 133 /*****************************************************************************
 134  * Filter
 135  *****************************************************************************/
 136 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 137 {
 138     picture_t * p_outpic;
 139     filter_sys_t *p_sys = p_filter->p_sys;
 140
 141     if( !p_pic ) return NULL;
 142
 143     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 144     if( !p_outpic )
 145     {
 146         msg_Warn( p_filter, "can't get output picture" );
 147         if( p_pic->pf_release )
 148             p_pic->pf_release( p_pic );
 149         return NULL;
 150     }
 151
 152     if( !p_sys->pp_planes )
 153     {
 154         /* initialise our picture buffer */
 155         int i_plane;
 156         p_sys->i_planes = p_pic->i_planes;
 157         p_sys->pp_planes =
 158             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 159         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 160         {
 161             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 162                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 163         }
 164         Copy( p_filter, p_pic );
 165     }
 166
 167     /* Get a new picture */
 168     RenderBlur( p_sys, p_pic, p_outpic );
 169     Copy( p_filter, p_outpic );
 170
 171     return CopyInfoAndRelease( p_outpic, p_pic );
 172 }
 173
 174 /*****************************************************************************
 175  * RenderBlur: renders a blurred picture
 176  *****************************************************************************/
 177 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 178                         picture_t *p_outpic )
 179 {
 180     int i_plane;
 181     int i_oldfactor = p_sys->i_factor;
 182     int i_newfactor = 128 - i_oldfactor;
 183     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 184     {
 185         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 186         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 187         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 188         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 189
 190         p_out = p_outpic->p[i_plane].p_pixels;
 191         p_new = p_newpic->p[i_plane].p_pixels;
 192         p_old = p_sys->pp_planes[i_plane];
 193         p_out_end = p_out + i_pitch * i_visible_lines;
 194         while ( p_out < p_out_end )
 195         {
 196             p_out_line_end = p_out + i_visible_pitch;
 197
 198             while ( p_out < p_out_line_end )
 199             {
 200                 *p_out++ = (((*p_old++) * i_oldfactor) +
 201                             ((*p_new++) * i_newfactor)) >> 7;
 202             }
 203
 204             p_old += i_pitch - i_visible_pitch;
 205             p_new += i_pitch - i_visible_pitch;
 206             p_out += i_pitch - i_visible_pitch;
 207         }
 208     }
 209 }
 210
 211 static void Copy( filter_t *p_filter, picture_t *p_pic )
 212 {
 213     int i_plane;
 214     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 215     {
 216         vlc_memcpy(
 217             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 218             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 219     }
 220 }
 221
 222 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 223                                vlc_value_t oldval, vlc_value_t newval,
 224                                void *p_data )
 225 {
 226     VLC_UNUSED(p_this); VLC_UNUSED(oldval);
 227     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 228     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 229         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 230     return VLC_SUCCESS;
 231 }