1 /*****************************************************************************
2 * motion_blur.c : motion blur filter for vlc
3 *****************************************************************************
4 * Copyright (C) 2000, 2001, 2002, 2003 the VideoLAN team
7 * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
8 * Antoine Cellerier <dionoea &t videolan d.t org>
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.
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.
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 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
37 #include <vlc_filter.h>
38 #include "filter_picture.h"
40 /*****************************************************************************
42 *****************************************************************************/
43 static int Create ( vlc_object_t * );
44 static void Destroy ( vlc_object_t * );
45 static picture_t *Filter ( filter_t *, picture_t * );
46 static void RenderBlur ( filter_sys_t *, picture_t *, picture_t * );
47 static void Copy ( filter_t *, picture_t * );
48 static int MotionBlurCallback( vlc_object_t *, char const *,
49 vlc_value_t, vlc_value_t, void * );
51 /*****************************************************************************
53 *****************************************************************************/
54 #define FACTOR_TEXT N_("Blur factor (1-127)")
55 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
57 #define FILTER_PREFIX "blur-"
60 set_shortname( N_("Motion blur") );
61 set_description( N_("Motion blur filter") );
62 set_capability( "video filter2", 0 );
63 set_category( CAT_VIDEO );
64 set_subcategory( SUBCAT_VIDEO_VFILTER );
66 add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127, NULL,
67 FACTOR_TEXT, FACTOR_LONGTEXT, false );
69 add_shortcut( "blur" );
71 set_callbacks( Create, Destroy );
74 static const char *const ppsz_filter_options[] = {
78 /*****************************************************************************
80 *****************************************************************************/
89 /*****************************************************************************
91 *****************************************************************************/
92 static int Create( vlc_object_t *p_this )
94 filter_t *p_filter = (filter_t *)p_this;
96 /* Allocate structure */
97 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
98 if( p_filter->p_sys == NULL )
101 p_filter->pf_video_filter = Filter;
103 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
106 p_filter->p_sys->i_factor =
107 var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" );
108 var_AddCallback( p_filter, FILTER_PREFIX "factor",
109 MotionBlurCallback, p_filter->p_sys );
111 p_filter->p_sys->pp_planes = NULL;
112 p_filter->p_sys->i_planes = 0;
117 /*****************************************************************************
119 *****************************************************************************/
120 static void Destroy( vlc_object_t *p_this )
122 filter_t *p_filter = (filter_t *)p_this;
124 while( p_filter->p_sys->i_planes-- )
125 free( p_filter->p_sys->pp_planes[p_filter->p_sys->i_planes] );
126 free( p_filter->p_sys->pp_planes );
127 free( p_filter->p_sys );
130 /*****************************************************************************
132 *****************************************************************************/
133 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
135 picture_t * p_outpic;
136 filter_sys_t *p_sys = p_filter->p_sys;
138 if( !p_pic ) return NULL;
140 p_outpic = filter_NewPicture( p_filter );
143 picture_Release( p_pic );
147 if( !p_sys->pp_planes )
149 /* initialise our picture buffer */
151 p_sys->i_planes = p_pic->i_planes;
153 (uint8_t**)malloc( p_sys->i_planes * sizeof( uint8_t * ) );
154 for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
156 p_sys->pp_planes[i_plane] = (uint8_t*)malloc(
157 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
159 Copy( p_filter, p_pic );
162 /* Get a new picture */
163 RenderBlur( p_sys, p_pic, p_outpic );
164 Copy( p_filter, p_outpic );
166 return CopyInfoAndRelease( p_outpic, p_pic );
169 /*****************************************************************************
170 * RenderBlur: renders a blurred picture
171 *****************************************************************************/
172 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
173 picture_t *p_outpic )
176 int i_oldfactor = p_sys->i_factor;
177 int i_newfactor = 128 - i_oldfactor;
178 for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
180 uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
181 const int i_pitch = p_outpic->p[i_plane].i_pitch;
182 const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
183 const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
185 p_out = p_outpic->p[i_plane].p_pixels;
186 p_new = p_newpic->p[i_plane].p_pixels;
187 p_old = p_sys->pp_planes[i_plane];
188 p_out_end = p_out + i_pitch * i_visible_lines;
189 while ( p_out < p_out_end )
191 p_out_line_end = p_out + i_visible_pitch;
193 while ( p_out < p_out_line_end )
195 *p_out++ = (((*p_old++) * i_oldfactor) +
196 ((*p_new++) * i_newfactor)) >> 7;
199 p_old += i_pitch - i_visible_pitch;
200 p_new += i_pitch - i_visible_pitch;
201 p_out += i_pitch - i_visible_pitch;
206 static void Copy( filter_t *p_filter, picture_t *p_pic )
209 for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
212 p_filter->p_sys->pp_planes[i_plane], p_pic->p[i_plane].p_pixels,
213 p_pic->p[i_plane].i_pitch * p_pic->p[i_plane].i_visible_lines );
217 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
218 vlc_value_t oldval, vlc_value_t newval,
221 VLC_UNUSED(p_this); VLC_UNUSED(oldval);
222 filter_sys_t *p_sys = (filter_sys_t *)p_data;
223 if( !strcmp( psz_var, FILTER_PREFIX "factor" ) )
224 p_sys->i_factor = __MIN( 127, __MAX( 1, newval.i_int ) );