Remove most nested headers from <vlc_filter.h>
[vlc.git] / modules / video_filter / motionblur.c
1 /*****************************************************************************
2  * motionblur.c : motion blur filter for vlc
3  *****************************************************************************
4  * Copyright (C) 2000, 2001, 2002, 2003 VLC authors and VideoLAN
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 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.
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 Lesser General Public License for more details.
19  *
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  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28
29 #ifdef HAVE_CONFIG_H
30 # include "config.h"
31 #endif
32
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_sout.h>
36 #include <vlc_filter.h>
37 #include <vlc_atomic.h>
38 #include <vlc_picture.h>
39 #include "filter_picture.h"
40
41 /*****************************************************************************
42  * Local protypes
43  *****************************************************************************/
44 static int  Create       ( vlc_object_t * );
45 static void Destroy      ( vlc_object_t * );
46 static picture_t *Filter ( filter_t *, picture_t * );
47 static void RenderBlur   ( filter_sys_t *, picture_t *, picture_t * );
48 static int MotionBlurCallback( vlc_object_t *, char const *,
49                                vlc_value_t, vlc_value_t, void * );
50
51 /*****************************************************************************
52  * Module descriptor
53  *****************************************************************************/
54 #define FACTOR_TEXT N_("Blur factor (1-127)")
55 #define FACTOR_LONGTEXT N_("The degree of blurring from 1 to 127.")
56
57 #define FILTER_PREFIX "blur-"
58
59 vlc_module_begin ()
60     set_shortname( N_("Motion blur") )
61     set_description( N_("Motion blur filter") )
62     set_capability( "video filter", 0 )
63     set_category( CAT_VIDEO )
64     set_subcategory( SUBCAT_VIDEO_VFILTER )
65
66     add_integer_with_range( FILTER_PREFIX "factor", 80, 1, 127,
67                             FACTOR_TEXT, FACTOR_LONGTEXT, false )
68
69     add_shortcut( "blur" )
70
71     set_callbacks( Create, Destroy )
72 vlc_module_end ()
73
74 static const char *const ppsz_filter_options[] = {
75     "factor", NULL
76 };
77
78 /*****************************************************************************
79  * filter_sys_t
80  *****************************************************************************/
81 struct filter_sys_t
82 {
83     picture_t *p_tmp;
84     bool      b_first;
85     atomic_int i_factor;
86 };
87
88 /*****************************************************************************
89  * Create
90  *****************************************************************************/
91 static int Create( vlc_object_t *p_this )
92 {
93     filter_t *p_filter = (filter_t *)p_this;
94
95     const vlc_chroma_description_t *p_chroma =
96         vlc_fourcc_GetChromaDescription( p_filter->fmt_in.video.i_chroma );
97     if( p_chroma == NULL || p_chroma->plane_count == 0 )
98         return VLC_EGENERIC;
99
100     /* Allocate structure */
101     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
102     if( p_filter->p_sys == NULL )
103         return VLC_ENOMEM;
104
105     p_filter->p_sys->p_tmp = picture_NewFromFormat( &p_filter->fmt_in.video );
106     if( !p_filter->p_sys->p_tmp )
107     {
108         free( p_filter->p_sys );
109         return VLC_ENOMEM;
110     }
111     p_filter->p_sys->b_first = true;
112
113     p_filter->pf_video_filter = Filter;
114
115     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
116                        p_filter->p_cfg );
117
118     atomic_init( &p_filter->p_sys->i_factor,
119              var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "factor" ) );
120     var_AddCallback( p_filter, FILTER_PREFIX "factor",
121                      MotionBlurCallback, p_filter->p_sys );
122
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     var_DelCallback( p_filter, FILTER_PREFIX "factor",
135                      MotionBlurCallback, p_filter->p_sys );
136
137     picture_Release( p_filter->p_sys->p_tmp );
138     free( p_filter->p_sys );
139 }
140
141 /*****************************************************************************
142  * Filter
143  *****************************************************************************/
144 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
145 {
146     picture_t * p_outpic;
147     filter_sys_t *p_sys = p_filter->p_sys;
148
149     if( !p_pic ) return NULL;
150
151     p_outpic = filter_NewPicture( p_filter );
152     if( !p_outpic )
153     {
154         picture_Release( p_pic );
155         return NULL;
156     }
157
158     if( p_sys->b_first )
159     {
160         picture_CopyPixels( p_sys->p_tmp, p_pic );
161         p_sys->b_first = false;
162     }
163
164     /* Get a new picture */
165     RenderBlur( p_sys, p_pic, p_outpic );
166
167     picture_CopyPixels( p_sys->p_tmp, p_outpic );
168
169     return CopyInfoAndRelease( p_outpic, p_pic );
170 }
171
172 /*****************************************************************************
173  * RenderBlur: renders a blurred picture
174  *****************************************************************************/
175 static void RenderBlur( filter_sys_t *p_sys, picture_t *p_newpic,
176                         picture_t *p_outpic )
177 {
178     const int i_oldfactor = atomic_load( &p_sys->i_factor );
179     int i_newfactor = 128 - i_oldfactor;
180
181     for( int i_plane = 0; i_plane < p_outpic->i_planes; i_plane++ )
182     {
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;
186
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 )
192         {
193             p_out_line_end = p_out + i_visible_pitch;
194
195             while ( p_out < p_out_line_end )
196             {
197                 *p_out++ = (((*p_old++) * i_oldfactor) +
198                             ((*p_new++) * i_newfactor)) >> 7;
199             }
200
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;
204         }
205     }
206 }
207
208 static int MotionBlurCallback( vlc_object_t *p_this, char const *psz_var,
209                                vlc_value_t oldval, vlc_value_t newval,
210                                void *p_data )
211 {
212     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
213     filter_sys_t *p_sys = (filter_sys_t *)p_data;
214
215     atomic_store( &p_sys->i_factor, VLC_CLIP( newval.i_int, 1, 127 ) );
216     return VLC_SUCCESS;
217 }