1 /*****************************************************************************
2 * motionblur.c : motion blur filter for vlc
3 *****************************************************************************
4 * Copyright (C) 2000, 2001, 2002, 2003 VLC authors and VideoLAN
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 it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
36 #include <vlc_filter.h>
37 #include <vlc_atomic.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 int MotionBlurCallback( vlc_object_t *, char const *,
48 vlc_value_t, vlc_value_t, void * );
50 /*****************************************************************************
52 *****************************************************************************/
53 #define FACTOR_TEXT N_("Blur factor (1-127)")
54 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
56 #define FILTER_PREFIX "blur-"
59 set_shortname( N_("Motion blur") )
60 set_description( N_("Motion blur filter") )
61 set_capability( "video filter2", 0 )
62 set_category( CAT_VIDEO )
63 set_subcategory( SUBCAT_VIDEO_VFILTER )
65 add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127,
66 FACTOR_TEXT, FACTOR_LONGTEXT, false )
68 add_shortcut( "blur" )
70 set_callbacks( Create, Destroy )
73 static const char *const ppsz_filter_options[] = {
77 /*****************************************************************************
79 *****************************************************************************/
87 /*****************************************************************************
89 *****************************************************************************/
90 static int Create( vlc_object_t *p_this )
92 filter_t *p_filter = (filter_t *)p_this;
94 const vlc_chroma_description_t *p_chroma =
95 vlc_fourcc_GetChromaDescription( p_filter->fmt_in.video.i_chroma );
96 if( p_chroma == NULL || p_chroma->plane_count == 0 )
99 /* Allocate structure */
100 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
101 if( p_filter->p_sys == NULL )
104 p_filter->p_sys->p_tmp = picture_NewFromFormat( &p_filter->fmt_in.video );
105 if( !p_filter->p_sys->p_tmp )
107 free( p_filter->p_sys );
110 p_filter->p_sys->b_first = true;
112 p_filter->pf_video_filter = Filter;
114 config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
117 atomic_init( &p_filter->p_sys->i_factor,
118 var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" ) );
119 var_AddCallback( p_filter, FILTER_PREFIX "factor",
120 MotionBlurCallback, p_filter->p_sys );
126 /*****************************************************************************
128 *****************************************************************************/
129 static void Destroy( vlc_object_t *p_this )
131 filter_t *p_filter = (filter_t *)p_this;
133 var_DelCallback( p_filter, FILTER_PREFIX "factor",
134 MotionBlurCallback, p_filter->p_sys );
136 picture_Release( p_filter->p_sys->p_tmp );
137 free( p_filter->p_sys );
140 /*****************************************************************************
142 *****************************************************************************/
143 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
145 picture_t * p_outpic;
146 filter_sys_t *p_sys = p_filter->p_sys;
148 if( !p_pic ) return NULL;
150 p_outpic = filter_NewPicture( p_filter );
153 picture_Release( p_pic );
159 picture_CopyPixels( p_sys->p_tmp, p_pic );
160 p_sys->b_first = false;
163 /* Get a new picture */
164 RenderBlur( p_sys, p_pic, p_outpic );
166 picture_CopyPixels( p_sys->p_tmp, p_outpic );
168 return CopyInfoAndRelease( p_outpic, p_pic );
171 /*****************************************************************************
172 * RenderBlur: renders a blurred picture
173 *****************************************************************************/
174 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
175 picture_t *p_outpic )
178 const int i_oldfactor = atomic_load( &p_sys->i_factor );
179 int i_newfactor = 128 - i_oldfactor;
181 for( i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
183 uint8_t *p_old, *p_new, *p_out, *p_out_end, *p_out_line_end;
184 const int i_visible_pitch = p_outpic->p[i_plane].i_visible_pitch;
185 const int i_visible_lines = p_outpic->p[i_plane].i_visible_lines;
187 p_out = p_outpic->p[i_plane].p_pixels;
188 p_new = p_newpic->p[i_plane].p_pixels;
189 p_old = p_sys->p_tmp->p[i_plane].p_pixels;
190 p_out_end = p_out + p_outpic->p[i_plane].i_pitch * i_visible_lines;
191 while ( p_out < p_out_end )
193 p_out_line_end = p_out + i_visible_pitch;
195 while ( p_out < p_out_line_end )
197 *p_out++ = (((*p_old++) * i_oldfactor) +
198 ((*p_new++) * i_newfactor)) >> 7;
201 p_old += p_sys->p_tmp->p[i_plane].i_pitch - i_visible_pitch;
202 p_new += p_newpic->p[i_plane].i_pitch - i_visible_pitch;
203 p_out += p_outpic->p[i_plane].i_pitch - i_visible_pitch;
208 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
209 vlc_value_t oldval, vlc_value_t newval,
212 VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
213 filter_sys_t *p_sys = (filter_sys_t *)p_data;
215 atomic_store( &p_sys->i_factor, VLC_CLIP( newval.i_int, 1, 127 ) );