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
  39 /*****************************************************************************
  40  * Local protypes
  41  *****************************************************************************/
  42 static int  Create       ( vlc_object_t * );
  43 static void Destroy      ( vlc_object_t * );
  44 static picture_t *Filter ( filter_t *, picture_t * );
  45 static void RenderBlur   ( filter_sys_t *, picture_t *, picture_t * );
  46 static void Copy         ( filter_t *, picture_t * );
  47 static int MotionBlurCallback( vlc_object_t *, char const *,
  48                                vlc_value_t, vlc_value_t, void * );
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 #define FACTOR_TEXT N_("Blur factor (1-127)")
  54 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
  55
  56 #define FILTER_PREFIX "blur-"
  57
  58 vlc_module_begin();
  59     set_shortname( N_("Motion blur") );
  60     set_description( N_("Motion blur filter") );
  61     set_capability( "video filter2", 0 );
  62     set_category( CAT_VIDEO );
  63     set_subcategory( SUBCAT_VIDEO_VFILTER );
  64
  65     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
  66                             FACTOR_TEXT, FACTOR_LONGTEXT, false );
  67
  68     add_shortcut( "blur" );
  69
  70     set_callbacks( Create, Destroy );
  71 vlc_module_end();
  72
  73 static const char *const ppsz_filter_options[] = {
  74     "factor", NULL
  75 };
  76
  77 /*****************************************************************************
  78  * filter_sys_t
  79  *****************************************************************************/
  80 struct filter_sys_t
  81 {
  82     int        i_factor;
  83
  84     uint8_t  **pp_planes;
  85     int        i_planes;
  86 };
  87
  88 /*****************************************************************************
  89  * Create
  90  *****************************************************************************/
  91 static int Create( vlc_object_t *p_this )
  92 {
  93     filter_t *p_filter = (filter_t *)p_this;
  94
  95     /* Allocate structure */
  96     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  97     if( p_filter->p_sys == NULL )
  98     {
  99         msg_Err( p_filter, "out of memory" );
 100         return VLC_ENOMEM;
 101     }
 102
 103     p_filter->pf_video_filter = Filter;
 104
 105     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 106                        p_filter->p_cfg );
 107
 108     p_filter->p_sys->i_factor =
 109         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 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     while( p_filter->p_sys->i_planes-- )
 127         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 128     free( p_filter->p_sys->pp_planes );
 129     free( p_filter->p_sys );
 130 }
 131
 132 #define RELEASE( pic ) \
 133         if( pic ->pf_release ) \
 134             pic ->pf_release( pic );
 135
 136 #define INITPIC( dst, src ) \
 137     dst ->date = src ->date; \
 138     dst ->b_force = src ->b_force; \
 139     dst ->i_nb_fields = src ->i_nb_fields; \
 140     dst ->b_progressive = src->b_progressive; \
 141     dst ->b_top_field_first = src ->b_top_field_first;
 142
 143 /*****************************************************************************
 144  * Filter
 145  *****************************************************************************/
 146 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 147 {
 148     picture_t * p_outpic;
 149     filter_sys_t *p_sys = p_filter->p_sys;
 150
 151     if( !p_pic ) return NULL;
 152
 153     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 154     if( !p_outpic )
 155     {
 156         msg_Warn( p_filter, "can't get output picture" );
 157         RELEASE( p_pic );
 158         return NULL;
 159     }
 160     INITPIC( p_outpic, p_pic );
 161
 162     if( !p_sys->pp_planes )
 163     {
 164         /* initialise our picture buffer */
 165         int i_plane;
 166         p_sys->i_planes = p_pic->i_planes;
 167         p_sys->pp_planes =
 168             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 169         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 170         {
 171             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 172                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 173         }
 174         Copy( p_filter, p_pic );
 175     }
 176
 177     /* Get a new picture */
 178     RenderBlur( p_sys, p_pic, p_outpic );
 179     Copy( p_filter, p_outpic );
 180
 181     RELEASE( p_pic );
 182     return p_outpic;
 183 }
 184
 185 /*****************************************************************************
 186  * RenderBlur: renders a blurred picture
 187  *****************************************************************************/
 188 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 189                         picture_t *p_outpic )
 190 {
 191     int i_plane;
 192     int i_oldfactor = p_sys->i_factor;
 193     int i_newfactor = 128 - i_oldfactor;
 194     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 195     {
 196         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 197         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 198         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 199         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 200
 201         p_out = p_outpic->p[i_plane].p_pixels;
 202         p_new = p_newpic->p[i_plane].p_pixels;
 203         p_old = p_sys->pp_planes[i_plane];
 204         p_out_end = p_out + i_pitch * i_visible_lines;
 205         while ( p_out < p_out_end )
 206         {
 207             p_out_line_end = p_out + i_visible_pitch;
 208
 209             while ( p_out < p_out_line_end )
 210             {
 211                 *p_out++ = (((*p_old++) * i_oldfactor) +
 212                             ((*p_new++) * i_newfactor)) >> 7;
 213             }
 214
 215             p_old += i_pitch - i_visible_pitch;
 216             p_new += i_pitch - i_visible_pitch;
 217             p_out += i_pitch - i_visible_pitch;
 218         }
 219     }
 220 }
 221
 222 static void Copy( filter_t *p_filter, picture_t *p_pic )
 223 {
 224     int i_plane;
 225     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 226     {
 227         vlc_memcpy(
 228             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 229             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 230     }
 231 }
 232
 233 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 234                                vlc_value_t oldval, vlc_value_t newval,
 235                                void *p_data )
 236 {
 237     VLC_UNUSED(p_this); VLC_UNUSED(oldval);
 238     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 239     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 240         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 241     return VLC_SUCCESS;
 242 }