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         return VLC_ENOMEM;
 100
 101     p_filter->pf_video_filter = Filter;
 102
 103     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 104                        p_filter->p_cfg );
 105
 106     p_filter->p_sys->i_factor =
 107         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 108     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 109                      MotionBlurCallback, p_filter->p_sys );
 110
 111     p_filter->p_sys->pp_planes = NULL;
 112     p_filter->p_sys->i_planes = 0;
 113
 114     return VLC_SUCCESS;
 115 }
 116
 117 /*****************************************************************************
 118  * Destroy
 119  *****************************************************************************/
 120 static void Destroy( vlc_object_t *p_this )
 121 {
 122     filter_t *p_filter = (filter_t *)p_this;
 123
 124     while( p_filter->p_sys->i_planes-- )
 125         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 126     free( p_filter->p_sys->pp_planes );
 127     free( p_filter->p_sys );
 128 }
 129
 130 /*****************************************************************************
 131  * Filter
 132  *****************************************************************************/
 133 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 134 {
 135     picture_t * p_outpic;
 136     filter_sys_t *p_sys = p_filter->p_sys;
 137
 138     if( !p_pic ) return NULL;
 139
 140     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 141     if( !p_outpic )
 142     {
 143         msg_Warn( p_filter, "can't get output picture" );
 144         if( p_pic->pf_release )
 145             p_pic->pf_release( p_pic );
 146         return NULL;
 147     }
 148
 149     if( !p_sys->pp_planes )
 150     {
 151         /* initialise our picture buffer */
 152         int i_plane;
 153         p_sys->i_planes = p_pic->i_planes;
 154         p_sys->pp_planes =
 155             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 156         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 157         {
 158             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 159                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 160         }
 161         Copy( p_filter, p_pic );
 162     }
 163
 164     /* Get a new picture */
 165     RenderBlur( p_sys, p_pic, p_outpic );
 166     Copy( p_filter, 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     int i_oldfactor = p_sys->i_factor;
 179     int i_newfactor = 128 - i_oldfactor;
 180     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 181     {
 182         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 183         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 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->pp_planes[i_plane];
 190         p_out_end = p_out + 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 += i_pitch - i_visible_pitch;
 202             p_new += i_pitch - i_visible_pitch;
 203             p_out += i_pitch - i_visible_pitch;
 204         }
 205     }
 206 }
 207
 208 static void Copy( filter_t *p_filter, picture_t *p_pic )
 209 {
 210     int i_plane;
 211     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 212     {
 213         vlc_memcpy(
 214             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 215             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 216     }
 217 }
 218
 219 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 220                                vlc_value_t oldval, vlc_value_t newval,
 221                                void *p_data )
 222 {
 223     VLC_UNUSED(p_this); VLC_UNUSED(oldval);
 224     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 225     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 226         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 227     return VLC_SUCCESS;
 228 }