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