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 #include <stdlib.h>                                      /* malloc(), free() */
  29 #include <string.h>
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc_sout.h>
  33 #include <vlc_vout.h>
  34 #include <vlc_filter.h>
  35
  36 /*****************************************************************************
  37  * Local protypes
  38  *****************************************************************************/
  39 static int  Create       ( vlc_object_t * );
  40 static void Destroy      ( vlc_object_t * );
  41 static picture_t *Filter ( filter_t *, picture_t * );
  42 static void RenderBlur   ( filter_sys_t *, picture_t *, picture_t * );
  43 static void Copy         ( filter_t *, uint8_t **, picture_t * );
  44 static int MotionBlurCallback( vlc_object_t *, char const *,
  45                                vlc_value_t, vlc_value_t, void * );
  46
  47 /*****************************************************************************
  48  * Module descriptor
  49  *****************************************************************************/
  50 #define FACTOR_TEXT N_("Blur factor (1-127)")
  51 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
  52
  53 #define FILTER_PREFIX "blur-"
  54
  55 vlc_module_begin();
  56     set_shortname( _("Motion blur") );
  57     set_description( _("Motion blur filter") );
  58     set_capability( "video filter2", 0 );
  59     set_category( CAT_VIDEO );
  60     set_subcategory( SUBCAT_VIDEO_VFILTER );
  61
  62     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
  63                             FACTOR_TEXT, FACTOR_LONGTEXT, VLC_FALSE );
  64
  65     add_shortcut( "blur" );
  66
  67     set_callbacks( Create, Destroy );
  68 vlc_module_end();
  69
  70 static const char *ppsz_filter_options[] = {
  71     "factor", NULL
  72 };
  73
  74 /*****************************************************************************
  75  * filter_sys_t
  76  *****************************************************************************/
  77 struct filter_sys_t
  78 {
  79     int        i_factor;
  80
  81     uint8_t  **pp_planes;
  82     int        i_planes;
  83 };
  84
  85 /*****************************************************************************
  86  * Create
  87  *****************************************************************************/
  88 static int Create( vlc_object_t *p_this )
  89 {
  90     filter_t *p_filter = (filter_t *)p_this;
  91
  92     /* Allocate structure */
  93     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  94     if( p_filter->p_sys == NULL )
  95     {
  96         msg_Err( p_filter, "out of memory" );
  97         return VLC_ENOMEM;
  98     }
  99
 100     p_filter->pf_video_filter = Filter;
 101
 102     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 103                        p_filter->p_cfg );
 104
 105     p_filter->p_sys->i_factor =
 106         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 107     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 108                      MotionBlurCallback, p_filter->p_sys );
 109
 110     p_filter->p_sys->pp_planes = NULL;
 111     p_filter->p_sys->i_planes = 0;
 112
 113     return VLC_SUCCESS;
 114 }
 115
 116 /*****************************************************************************
 117  * Destroy
 118  *****************************************************************************/
 119 static void Destroy( vlc_object_t *p_this )
 120 {
 121     filter_t *p_filter = (filter_t *)p_this;
 122
 123     while( p_filter->p_sys->i_planes-- )
 124         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 125     free( p_filter->p_sys->pp_planes );
 126     free( p_filter->p_sys );
 127 }
 128
 129 #define RELEASE( pic ) \
 130         if( pic ->pf_release ) \
 131             pic ->pf_release( pic );
 132
 133 #define INITPIC( dst, src ) \
 134     dst ->date = src ->date; \
 135     dst ->b_force = src ->b_force; \
 136     dst ->i_nb_fields = src ->i_nb_fields; \
 137     dst ->b_progressive = src->b_progressive; \
 138     dst ->b_top_field_first = src ->b_top_field_first;
 139
 140 /*****************************************************************************
 141  * Filter
 142  *****************************************************************************/
 143 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 144 {
 145     picture_t * p_outpic;
 146     filter_sys_t *p_sys = p_filter->p_sys;
 147
 148     if( !p_pic ) return NULL;
 149
 150     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 151     if( !p_outpic )
 152     {
 153         msg_Warn( p_filter, "can't get output picture" );
 154         RELEASE( p_pic );
 155         return NULL;
 156     }
 157     INITPIC( p_outpic, p_pic );
 158
 159     if( !p_sys->pp_planes )
 160     {
 161         /* initialise our picture buffer */
 162         int i_plane;
 163         p_sys->i_planes = p_pic->i_planes;
 164         p_sys->pp_planes =
 165             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 166         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 167         {
 168             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 169                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 170         }
 171         Copy( p_filter, p_sys->pp_planes, p_pic );
 172     }
 173
 174     /* Get a new picture */
 175     RenderBlur( p_sys, p_pic, p_outpic );
 176     Copy( p_filter, p_sys->pp_planes, p_outpic );
 177
 178     RELEASE( p_pic );
 179     return p_outpic;
 180 }
 181
 182 /*****************************************************************************
 183  * RenderBlur: renders a blurred picture
 184  *****************************************************************************/
 185 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 186                         picture_t *p_outpic )
 187 {
 188     int i_plane;
 189     int i_oldfactor = p_sys->i_factor;
 190     int i_newfactor = 128 - i_oldfactor;
 191     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 192     {
 193         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 194         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 195         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 196         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 197
 198         p_out = p_outpic->p[i_plane].p_pixels;
 199         p_new = p_newpic->p[i_plane].p_pixels;
 200         p_old = p_sys->pp_planes[i_plane];
 201         p_out_end = p_out + i_pitch * i_visible_lines;
 202         while ( p_out < p_out_end )
 203         {
 204             p_out_line_end = p_out + i_visible_pitch;
 205
 206             while ( p_out < p_out_line_end )
 207             {
 208                 *p_out++ = (((*p_old++) * i_oldfactor) +
 209                             ((*p_new++) * i_newfactor)) >> 7;
 210             }
 211
 212             p_old += i_pitch - i_visible_pitch;
 213             p_new += i_pitch - i_visible_pitch;
 214             p_out += i_pitch - i_visible_pitch;
 215         }
 216     }
 217 }
 218
 219 static void Copy( filter_t *p_filter, uint8_t **pp_planes, picture_t *p_pic )
 220 {
 221     int i_plane;
 222     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 223     {
 224         p_filter->p_libvlc->pf_memcpy(
 225             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 226             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 227     }
 228 }
 229
 230 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 231                                vlc_value_t oldval, vlc_value_t newval,
 232                                void *p_data )
 233 {
 234     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 235     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 236         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 237     return VLC_SUCCESS;
 238 }