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