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         change_safe();
  63
  64     add_shortcut( "blur" );
  65
  66     set_callbacks( Create, Destroy );
  67 vlc_module_end();
  68
  69 static const char *ppsz_filter_options[] = {
  70     "factor", NULL
  71 };
  72
  73 /*****************************************************************************
  74  * filter_sys_t
  75  *****************************************************************************/
  76 struct filter_sys_t
  77 {
  78     int        i_factor;
  79
  80     uint8_t  **pp_planes;
  81     int        i_planes;
  82 };
  83
  84 /*****************************************************************************
  85  * Create
  86  *****************************************************************************/
  87 static int Create( vlc_object_t *p_this )
  88 {
  89     filter_t *p_filter = (filter_t *)p_this;
  90
  91     /* Allocate structure */
  92     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  93     if( p_filter->p_sys == NULL )
  94     {
  95         msg_Err( p_filter, "out of memory" );
  96         return VLC_ENOMEM;
  97     }
  98
  99     p_filter->pf_video_filter = Filter;
 100
 101     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 102                        p_filter->p_cfg );
 103
 104     p_filter->p_sys->i_factor =
 105         var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
 106     var_AddCallback( p_filter, FILTER_PREFIX "factor",
 107                      MotionBlurCallback, p_filter->p_sys );
 108
 109     p_filter->p_sys->pp_planes = NULL;
 110     p_filter->p_sys->i_planes = 0;
 111
 112     return VLC_SUCCESS;
 113 }
 114
 115 /*****************************************************************************
 116  * Destroy
 117  *****************************************************************************/
 118 static void Destroy( vlc_object_t *p_this )
 119 {
 120     filter_t *p_filter = (filter_t *)p_this;
 121
 122     while( p_filter->p_sys->i_planes-- )
 123         free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
 124     free( p_filter->p_sys->pp_planes );
 125     free( p_filter->p_sys );
 126 }
 127
 128 #define RELEASE( pic ) \
 129         if( pic ->pf_release ) \
 130             pic ->pf_release( pic );
 131
 132 #define INITPIC( dst, src ) \
 133     dst ->date = src ->date; \
 134     dst ->b_force = src ->b_force; \
 135     dst ->i_nb_fields = src ->i_nb_fields; \
 136     dst ->b_progressive = src->b_progressive; \
 137     dst ->b_top_field_first = src ->b_top_field_first;
 138
 139 /*****************************************************************************
 140  * Filter
 141  *****************************************************************************/
 142 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 143 {
 144     picture_t * p_outpic;
 145     filter_sys_t *p_sys = p_filter->p_sys;
 146
 147     if( !p_pic ) return NULL;
 148
 149     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 150     if( !p_outpic )
 151     {
 152         msg_Warn( p_filter, "can't get output picture" );
 153         RELEASE( p_pic );
 154         return NULL;
 155     }
 156     INITPIC( p_outpic, p_pic );
 157
 158     if( !p_sys->pp_planes )
 159     {
 160         /* initialise our picture buffer */
 161         int i_plane;
 162         p_sys->i_planes = p_pic->i_planes;
 163         p_sys->pp_planes =
 164             (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
 165         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 166         {
 167             p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
 168                 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 169         }
 170         Copy( p_filter, p_sys->pp_planes, p_pic );
 171     }
 172
 173     /* Get a new picture */
 174     RenderBlur( p_sys, p_pic, p_outpic );
 175     Copy( p_filter, p_sys->pp_planes, p_outpic );
 176
 177     RELEASE( p_pic );
 178     return p_outpic;
 179 }
 180
 181 /*****************************************************************************
 182  * RenderBlur: renders a blurred picture
 183  *****************************************************************************/
 184 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
 185                         picture_t *p_outpic )
 186 {
 187     int i_plane;
 188     int i_oldfactor = p_sys->i_factor;
 189     int i_newfactor = 128 - i_oldfactor;
 190     for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
 191     {
 192         uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
 193         const int i_pitch = p_outpic->p[i_plane].i_pitch;
 194         const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
 195         const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
 196
 197         p_out = p_outpic->p[i_plane].p_pixels;
 198         p_new = p_newpic->p[i_plane].p_pixels;
 199         p_old = p_sys->pp_planes[i_plane];
 200         p_out_end = p_out + i_pitch * i_visible_lines;
 201         while ( p_out < p_out_end )
 202         {
 203             p_out_line_end = p_out + i_visible_pitch;
 204
 205             while ( p_out < p_out_line_end )
 206             {
 207                 *p_out++ = (((*p_old++) * i_oldfactor) +
 208                             ((*p_new++) * i_newfactor)) >> 7;
 209             }
 210
 211             p_old += i_pitch - i_visible_pitch;
 212             p_new += i_pitch - i_visible_pitch;
 213             p_out += i_pitch - i_visible_pitch;
 214         }
 215     }
 216 }
 217
 218 static void Copy( filter_t *p_filter, uint8_t **pp_planes, picture_t *p_pic )
 219 {
 220     int i_plane;
 221     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 222     {
 223         p_filter->p_libvlc->pf_memcpy(
 224             p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
 225             p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
 226     }
 227 }
 228
 229 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
 230                                vlc_value_t oldval, vlc_value_t newval,
 231                                void *p_data )
 232 {
 233     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 234     if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
 235         p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );
 236     return VLC_SUCCESS;
 237 }