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/vlc.h>
  34 #include <vlc_sout.h>
  35 #include <vlc_vout.h>
  36 #include <vlc_filter.h>
  37
  38 /*****************************************************************************
  39  * Local protypes
  40  *****************************************************************************/
  41 static int  Create       ( vlc_object_t * );
  42 static void Destroy      ( vlc_object_t * );
  43 static picture_t *Filter ( filter_t *, picture_t * );
  44 static void RenderBlur   ( filter_sys_t *, picture_t *, picture_t * );
  45 static void Copy         ( filter_t *, picture_t * );
  46 static int MotionBlurCallback( vlc_object_t *, char const *,
  47                                vlc_value_t, vlc_value_t, void * );
  48
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52 #define FACTOR_TEXT N_("Blur factor (1-127)")
  53 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
  54
  55 #define FILTER_PREFIX "blur-"
  56
  57 vlc_module_begin();
  58     set_shortname( _("Motion blur") );
  59     set_description( _("Motion blur filter") );
  60     set_capability( "video filter2", 0 );
  61     set_category( CAT_VIDEO );
  62     set_subcategory( SUBCAT_VIDEO_VFILTER );
  63
  64     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
  65                             FACTOR_TEXT, FACTOR_LONGTEXT, VLC_FALSE );
  66
  67     add_shortcut( "blur" );
  68
  69     set_callbacks( Create, Destroy );
  70 vlc_module_end();
  71
  72 static const char *ppsz_filter_options[] = {
  73     "factor", NULL
  74 };
  75
  76 /*****************************************************************************
  77  * filter_sys_t
  78  *****************************************************************************/
  79 struct filter_sys_t
  80 {
  81     int        i_factor;
  82
  83     uint8_t  **pp_planes;
  84     int        i_planes;
  85 };
  86
  87 /*****************************************************************************
  88  * Create
  89  *****************************************************************************/
  90 static int Create( vlc_object_t *p_this )
  91 {
  92     filter_t *p_filter = (filter_t *)p_this;
  93
  94     /* Allocate structure */
  95     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  96     if( p_filter->p_sys == NULL )
  97     {
  98         msg_Err( p_filter, "out of memory" );
  99         return VLC_ENOMEM;
 100     }
 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     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 110                      MotionBlurCallback, p_filter->p_sys );
 111
 112     p_filter->p_sys->pp_planes = NULL;
 113     p_filter->p_sys->i_planes = 0;
 114
 115     return VLC_SUCCESS;
 116 }
 117
 118 /*****************************************************************************
 119  * Destroy
 120  *****************************************************************************/
 121 static void Destroy( vlc_object_t *p_this )
 122 {
 123     filter_t *p_filter = (filter_t *)p_this;
 124
 125     while( p_filter->p_sys->i_planes-- )
 126         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 127     free( p_filter->p_sys->pp_planes );
 128     free( p_filter->p_sys );
 129 }
 130
 131 #define RELEASE( pic ) \
 132         if( pic ->pf_release ) \
 133             pic ->pf_release( pic );
 134
 135 #define INITPIC( dst, src ) \
 136     dst ->date = src ->date; \
 137     dst ->b_force = src ->b_force; \
 138     dst ->i_nb_fields = src ->i_nb_fields; \
 139     dst ->b_progressive = src->b_progressive; \
 140     dst ->b_top_field_first = src ->b_top_field_first;
 141
 142 /*****************************************************************************
 143  * Filter
 144  *****************************************************************************/
 145 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 146 {
 147     picture_t * p_outpic;
 148     filter_sys_t *p_sys = p_filter->p_sys;
 149
 150     if( !p_pic ) return NULL;
 151
 152     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 153     if( !p_outpic )
 154     {
 155         msg_Warn( p_filter, "can't get output picture" );
 156         RELEASE( p_pic );
 157         return NULL;
 158     }
 159     INITPIC( p_outpic, p_pic );
 160
 161     if( !p_sys->pp_planes )
 162     {
 163         /* initialise our picture buffer */
 164         int i_plane;
 165         p_sys->i_planes = p_pic->i_planes;
 166         p_sys->pp_planes =
 167             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 168         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 169         {
 170             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 171                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 172         }
 173         Copy( p_filter, p_pic );
 174     }
 175
 176     /* Get a new picture */
 177     RenderBlur( p_sys, p_pic, p_outpic );
 178     Copy( p_filter, p_outpic );
 179
 180     RELEASE( p_pic );
 181     return p_outpic;
 182 }
 183
 184 /*****************************************************************************
 185  * RenderBlur: renders a blurred picture
 186  *****************************************************************************/
 187 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 188                         picture_t *p_outpic )
 189 {
 190     int i_plane;
 191     int i_oldfactor = p_sys->i_factor;
 192     int i_newfactor = 128 - i_oldfactor;
 193     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 194     {
 195         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 196         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 197         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 198         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 199
 200         p_out = p_outpic->p[i_plane].p_pixels;
 201         p_new = p_newpic->p[i_plane].p_pixels;
 202         p_old = p_sys->pp_planes[i_plane];
 203         p_out_end = p_out + i_pitch * i_visible_lines;
 204         while ( p_out < p_out_end )
 205         {
 206             p_out_line_end = p_out + i_visible_pitch;
 207
 208             while ( p_out < p_out_line_end )
 209             {
 210                 *p_out++ = (((*p_old++) * i_oldfactor) +
 211                             ((*p_new++) * i_newfactor)) >> 7;
 212             }
 213
 214             p_old += i_pitch - i_visible_pitch;
 215             p_new += i_pitch - i_visible_pitch;
 216             p_out += i_pitch - i_visible_pitch;
 217         }
 218     }
 219 }
 220
 221 static void Copy( filter_t *p_filter, picture_t *p_pic )
 222 {
 223     int i_plane;
 224     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 225     {
 226         p_filter->p_libvlc->pf_memcpy(
 227             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 228             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 229     }
 230 }
 231
 232 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 233                                vlc_value_t oldval, vlc_value_t newval,
 234                                void *p_data )
 235 {
 236     VLC_UNUSED(p_this); VLC_UNUSED(oldval);
 237     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 238     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 239         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 240     return VLC_SUCCESS;
 241 }