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/decoder.h>
  34
  35 #include "vlc_filter.h"
  36
  37 /*****************************************************************************
  38  * Local protypes
  39  *****************************************************************************/
  40 static int  Create       ( vlc_object_t * );
  41 static void Destroy      ( vlc_object_t * );
  42 static picture_t *Filter ( filter_t *, picture_t * );
  43 static void RenderBlur   ( filter_sys_t *, picture_t *, picture_t * );
  44 static void Copy         ( filter_t *, uint8_t **, picture_t * );
  45
  46 /*****************************************************************************
  47  * Module descriptor
  48  *****************************************************************************/
  49 #define FACTOR_TEXT N_("Blur factor (1-127)")
  50 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
  51
  52 #define PERSISTANT_TEXT N_("Keep inifinte memory of past images")
  53 #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\".")
  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     add_bool( FILTER_PREFIX "persistant", 0, NULL, PERSISTANT_TEXT,
  67               PERSISTANT_LONGTEXT, VLC_FALSE );
  68
  69     add_shortcut( "blur" );
  70
  71     set_callbacks( Create, Destroy );
  72 vlc_module_end();
  73
  74 static const char *ppsz_filter_options[] = {
  75     "factor", "persistant", NULL
  76 };
  77
  78 /*****************************************************************************
  79  * filter_sys_t
  80  *****************************************************************************/
  81 struct filter_sys_t
  82 {
  83     int        i_factor;
  84     vlc_bool_t b_persistant;
  85
  86     uint8_t  **pp_planes;
  87     int        i_planes;
  88 };
  89
  90 /*****************************************************************************
  91  * Create
  92  *****************************************************************************/
  93 static int Create( vlc_object_t *p_this )
  94 {
  95     filter_t *p_filter = (filter_t *)p_this;
  96
  97     /* Allocate structure */
  98     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  99     if( p_filter->p_sys == NULL )
 100     {
 101         msg_Err( p_filter, "out of memory" );
 102         return VLC_ENOMEM;
 103     }
 104
 105     p_filter->pf_video_filter = Filter;
 106
 107     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 108                        p_filter->p_cfg );
 109
 110     var_Create( p_filter, FILTER_PREFIX "factor",
 111                 VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 112     p_filter->p_sys->i_factor =
 113         var_GetInteger( p_filter, FILTER_PREFIX "factor" );
 114     var_Create( p_filter, FILTER_PREFIX "persistant",
 115                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 116     p_filter->p_sys->b_persistant =
 117         var_GetBool( p_filter, FILTER_PREFIX "persistant" );
 118
 119     printf("factor: %d\npersitant: %d\n", p_filter->p_sys->i_factor, p_filter->p_sys->b_persistant );
 120
 121     p_filter->p_sys->pp_planes = NULL;
 122     p_filter->p_sys->i_planes = 0;
 123
 124     return VLC_SUCCESS;
 125 }
 126
 127 /*****************************************************************************
 128  * Destroy
 129  *****************************************************************************/
 130 static void Destroy( vlc_object_t *p_this )
 131 {
 132     filter_t *p_filter = (filter_t *)p_this;
 133
 134     while( p_filter->p_sys->i_planes-- )
 135         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 136     free( p_filter->p_sys->pp_planes );
 137     free( p_filter->p_sys );
 138 }
 139
 140 #define RELEASE( pic ) \
 141         if( pic ->pf_release ) \
 142             pic ->pf_release( pic );
 143
 144 #define INITPIC( dst, src ) \
 145     dst ->date = src ->date; \
 146     dst ->b_force = src ->b_force; \
 147     dst ->i_nb_fields = src ->i_nb_fields; \
 148     dst ->b_progressive = src->b_progressive; \
 149     dst ->b_top_field_first = src ->b_top_field_first;
 150
 151 /*****************************************************************************
 152  * Filter
 153  *****************************************************************************/
 154 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 155 {
 156     picture_t * p_outpic;
 157     filter_sys_t *p_sys = p_filter->p_sys;
 158
 159     if( !p_pic ) return NULL;
 160
 161     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 162     if( !p_outpic )
 163     {
 164         msg_Warn( p_filter, "can't get output picture" );
 165         RELEASE( p_pic );
 166         return NULL;
 167     }
 168     INITPIC( p_outpic, p_pic );
 169
 170     if( !p_sys->pp_planes )
 171     {
 172         /* initialise our picture buffer */
 173         int i_plane;
 174         p_sys->i_planes = p_pic->i_planes;
 175         p_sys->pp_planes =
 176             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 177         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 178         {
 179             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 180                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 181         }
 182         Copy( p_filter, p_sys->pp_planes, p_pic );
 183     }
 184
 185     /* Get a new picture */
 186     RenderBlur( p_sys, p_pic, p_outpic );
 187     Copy( p_filter, p_sys->pp_planes, p_sys->b_persistant ? p_outpic : p_pic );
 188
 189     RELEASE( p_pic );
 190     return p_outpic;
 191 }
 192
 193 /*****************************************************************************
 194  * RenderBlur: renders a blurred picture
 195  *****************************************************************************/
 196 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 197                         picture_t *p_outpic )
 198 {
 199     int i_plane;
 200     int i_oldfactor = p_sys->i_factor;
 201     int i_newfactor = 128 - i_oldfactor;
 202     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 203     {
 204         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 205         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 206         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 207         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 208
 209         p_out = p_outpic->p[i_plane].p_pixels;
 210         p_new = p_newpic->p[i_plane].p_pixels;
 211         p_old = p_sys->pp_planes[i_plane];
 212         p_out_end = p_out + i_pitch * i_visible_lines;
 213         while ( p_out < p_out_end )
 214         {
 215             p_out_line_end = p_out + i_visible_pitch;
 216
 217             while ( p_out < p_out_line_end )
 218             {
 219                 *p_out++ = (((*p_old++) * i_oldfactor) +
 220                             ((*p_new++) * i_newfactor)) >> 7;
 221             }
 222
 223             p_old += i_pitch - i_visible_pitch;
 224             p_new += i_pitch - i_visible_pitch;
 225             p_out += i_pitch - i_visible_pitch;
 226         }
 227     }
 228 }
 229
 230 static void Copy( filter_t *p_filter, uint8_t **pp_planes, picture_t *p_pic )
 231 {
 232     int i_plane;
 233     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 234     {
 235         p_filter->p_libvlc->pf_memcpy(
 236             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 237             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 238     }
 239 }