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     vlc_spinlock_t lock;
  84     int        i_factor;
  85
  86     uint8_t  **pp_planes;
  87     int        i_planes;
  88 };
  89
  90 /*****************************************************************************
  91  * Create
  92  *****************************************************************************/
  93 static int Create( vlc_object_t *p_this )
  94 {
  95     filter_t *p_filter = (filter_t *)p_this;
  96
  97     /* Allocate structure */
  98     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  99     if( p_filter->p_sys == NULL )
 100         return VLC_ENOMEM;
 101
 102     p_filter->pf_video_filter = Filter;
 103
 104     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 105                        p_filter->p_cfg );
 106
 107     p_filter->p_sys->i_factor =
 108         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 109     vlc_spin_init( &p_filter->p_sys->lock );
 110     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 111                      MotionBlurCallback, p_filter->p_sys );
 112
 113     p_filter->p_sys->pp_planes = NULL;
 114     p_filter->p_sys->i_planes = 0;
 115
 116     return VLC_SUCCESS;
 117 }
 118
 119 /*****************************************************************************
 120  * Destroy
 121  *****************************************************************************/
 122 static void Destroy( vlc_object_t *p_this )
 123 {
 124     filter_t *p_filter = (filter_t *)p_this;
 125
 126     var_DelCallback( p_filter, FILTER_PREFIX "factor",
 127                      MotionBlurCallback, p_filter->p_sys );
 128     vlc_spin_destroy( &p_filter->p_sys->lock );
 129
 130     while( p_filter->p_sys->i_planes-- )
 131         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 132     free( p_filter->p_sys->pp_planes );
 133     free( p_filter->p_sys );
 134 }
 135
 136 /*****************************************************************************
 137  * Filter
 138  *****************************************************************************/
 139 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 140 {
 141     picture_t * p_outpic;
 142     filter_sys_t *p_sys = p_filter->p_sys;
 143
 144     if( !p_pic ) return NULL;
 145
 146     p_outpic = filter_NewPicture( p_filter );
 147     if( !p_outpic )
 148     {
 149         picture_Release( p_pic );
 150         return NULL;
 151     }
 152
 153     if( !p_sys->pp_planes )
 154     {
 155         /* initialise our picture buffer */
 156         int i_plane;
 157         p_sys->i_planes = p_pic->i_planes;
 158         p_sys->pp_planes =
 159             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 160         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 161         {
 162             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 163                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 164         }
 165         Copy( p_filter, p_pic );
 166     }
 167
 168     /* Get a new picture */
 169     RenderBlur( p_sys, p_pic, p_outpic );
 170     Copy( p_filter, p_outpic );
 171
 172     return CopyInfoAndRelease( p_outpic, p_pic );
 173 }
 174
 175 /*****************************************************************************
 176  * RenderBlur: renders a blurred picture
 177  *****************************************************************************/
 178 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 179                         picture_t *p_outpic )
 180 {
 181     int i_plane;
 182     int i_oldfactor = p_sys->i_factor;
 183     int i_newfactor = 128 - i_oldfactor;
 184     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 185     {
 186         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 187         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 188         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 189         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 190
 191         p_out = p_outpic->p[i_plane].p_pixels;
 192         p_new = p_newpic->p[i_plane].p_pixels;
 193         p_old = p_sys->pp_planes[i_plane];
 194         p_out_end = p_out + i_pitch * i_visible_lines;
 195         while ( p_out < p_out_end )
 196         {
 197             p_out_line_end = p_out + i_visible_pitch;
 198
 199             while ( p_out < p_out_line_end )
 200             {
 201                 *p_out++ = (((*p_old++) * i_oldfactor) +
 202                             ((*p_new++) * i_newfactor)) >> 7;
 203             }
 204
 205             p_old += i_pitch - i_visible_pitch;
 206             p_new += i_pitch - i_visible_pitch;
 207             p_out += i_pitch - i_visible_pitch;
 208         }
 209     }
 210 }
 211
 212 static void Copy( filter_t *p_filter, picture_t *p_pic )
 213 {
 214     int i_plane;
 215     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 216     {
 217         vlc_memcpy(
 218             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 219             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 220     }
 221 }
 222
 223 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 224                                vlc_value_t oldval, vlc_value_t newval,
 225                                void *p_data )
 226 {
 227     VLC_UNUSED(p_this); VLC_UNUSED(oldval);
 228     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 229
 230     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 231     {
 232         vlc_spin_lock( &p_sys->lock );
 233         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 234         vlc_spin_unlock( &p_sys->lock );
 235     }
 236     return VLC_SUCCESS;
 237 }