Copyright fixes
[vlc.git] / modules / video_filter / scale.c
1 /*****************************************************************************
2  * resize.c: video scaling module for YUVP/A pictures
3  *  Uses the low quality "nearest neighbour" algorithm.
4  *****************************************************************************
5  * Copyright (C) 2003 VideoLAN (Centrale Réseaux) and its contributors
6  * $Id$
7  *
8  * Author: Gildas Bazin <gbazin@videolan.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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
23  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28 #include <vlc/vlc.h>
29 #include <vlc/decoder.h>
30 #include "vlc_filter.h"
31
32 /*****************************************************************************
33  * filter_sys_t : filter descriptor
34  *****************************************************************************/
35 struct filter_sys_t
36 {
37     es_format_t fmt_in;
38     es_format_t fmt_out;
39 };
40
41 /****************************************************************************
42  * Local prototypes
43  ****************************************************************************/
44 static int  OpenFilter ( vlc_object_t * );
45 static void CloseFilter( vlc_object_t * );
46
47 static picture_t *Filter( filter_t *, picture_t * );
48
49 /*****************************************************************************
50  * Module descriptor
51  *****************************************************************************/
52 vlc_module_begin();
53     set_description( _("Video scaling filter") );
54     set_capability( "video filter2", 10000 );
55     set_category( CAT_VIDEO );
56     set_subcategory( SUBCAT_VIDEO_VFILTER );
57     set_callbacks( OpenFilter, CloseFilter );
58 vlc_module_end();
59
60 /*****************************************************************************
61  * OpenFilter: probe the filter and return score
62  *****************************************************************************/
63 static int OpenFilter( vlc_object_t *p_this )
64 {
65     filter_t *p_filter = (filter_t*)p_this;
66     filter_sys_t *p_sys;
67
68     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') &&
69           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') ) ||
70         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
71     {
72         return VLC_EGENERIC;
73     }
74
75     /* Allocate the memory needed to store the decoder's structure */
76     if( ( p_filter->p_sys = p_sys =
77           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
78     {
79         msg_Err( p_filter, "out of memory" );
80         return VLC_EGENERIC;
81     }
82
83     p_filter->pf_video_filter = Filter;
84
85     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
86              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
87              p_filter->fmt_out.video.i_height );
88
89     return VLC_SUCCESS;
90 }
91
92 /*****************************************************************************
93  * CloseFilter: clean up the filter
94  *****************************************************************************/
95 static void CloseFilter( vlc_object_t *p_this )
96 {
97     filter_t *p_filter = (filter_t*)p_this;
98     filter_sys_t *p_sys = p_filter->p_sys;
99
100     free( p_sys );
101 }
102
103 /****************************************************************************
104  * Filter: the whole thing
105  ****************************************************************************/
106 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
107 {
108     filter_sys_t *p_sys = p_filter->p_sys;
109     picture_t *p_pic_dst;
110     int i_plane, i, j, k, l;
111
112     /* Request output picture */
113     p_pic_dst = p_filter->pf_vout_buffer_new( p_filter );
114     if( !p_pic_dst )
115     {
116         msg_Warn( p_filter, "can't get output picture" );
117         if( p_pic->pf_release )
118             p_pic->pf_release( p_pic );
119         return NULL;
120     }
121
122     for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
123     {
124         uint8_t *p_src = p_pic->p[i_plane].p_pixels;
125         uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
126         int i_src_pitch = p_pic->p[i_plane].i_pitch;
127         int i_dst_pitch = p_pic_dst->p[i_plane].i_pitch;
128
129         for( i = 0; i < p_pic_dst->p[i_plane].i_visible_lines; i++ )
130         {
131             l = ( p_filter->fmt_in.video.i_height * i +
132                   p_filter->fmt_out.video.i_height / 2 ) /
133                 p_filter->fmt_out.video.i_height;
134
135             for( j = 0; j < p_pic_dst->p[i_plane].i_visible_pitch; j++ )
136             {
137                 k = ( p_filter->fmt_in.video.i_width * j +
138                       p_filter->fmt_out.video.i_width / 2 ) /
139                     p_filter->fmt_out.video.i_width;
140
141                 p_dst[i * i_dst_pitch + j] = p_src[l * i_src_pitch + k];
142             }
143         }
144     }
145
146     p_pic_dst->date = p_pic->date;
147     p_pic_dst->b_force = p_pic->b_force;
148     p_pic_dst->i_nb_fields = p_pic->i_nb_fields;
149     p_pic_dst->b_progressive = p_pic->b_progressive;
150     p_pic_dst->b_top_field_first = p_pic->b_top_field_first;
151
152     p_pic->pf_release( p_pic );
153     return p_pic_dst;
154 }