video_filters: remove unused p_sys structure.
[vlc.git] / modules / video_filter / scale.c
1 /*****************************************************************************
2  * resize.c: video scaling module for YUVP/A, I420 and RGBA pictures
3  *  Uses the low quality "nearest neighbour" algorithm.
4  *****************************************************************************
5  * Copyright (C) 2003-2007 the VideoLAN team
6  * $Id$
7  *
8  * Authors: Gildas Bazin <gbazin@videolan.org>
9  *          Antoine Cellerier <dionoea @t videolan dot org>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24  *****************************************************************************/
25
26 /*****************************************************************************
27  * Preamble
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_filter.h>
36
37 /****************************************************************************
38  * Local prototypes
39  ****************************************************************************/
40 static int  OpenFilter ( vlc_object_t * );
41 static void CloseFilter( vlc_object_t * );
42
43 static picture_t *Filter( filter_t *, picture_t * );
44
45 /*****************************************************************************
46  * Module descriptor
47  *****************************************************************************/
48 vlc_module_begin ()
49     set_description( N_("Video scaling filter") )
50     set_capability( "video filter2", 10 )
51     set_callbacks( OpenFilter, CloseFilter )
52 vlc_module_end ()
53
54 /*****************************************************************************
55  * OpenFilter: probe the filter and return score
56  *****************************************************************************/
57 static int OpenFilter( vlc_object_t *p_this )
58 {
59     filter_t *p_filter = (filter_t*)p_this;
60
61     if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
62           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
63           p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
64           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
65           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
66           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA ) ||
67         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
68     {
69         return VLC_EGENERIC;
70     }
71
72     p_filter->pf_video_filter = Filter;
73
74     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
75              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
76              p_filter->fmt_out.video.i_height );
77
78     return VLC_SUCCESS;
79 }
80
81 /*****************************************************************************
82  * CloseFilter: clean up the filter
83  *****************************************************************************/
84 static void CloseFilter( vlc_object_t *p_this )
85 {
86     (void)p_this;
87 }
88
89 /****************************************************************************
90  * Filter: the whole thing
91  ****************************************************************************/
92 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
93 {
94     picture_t *p_pic_dst;
95     int i_plane;
96
97     if( !p_pic ) return NULL;
98
99     if( (p_filter->fmt_in.video.i_height == 0) ||
100         (p_filter->fmt_in.video.i_width == 0) )
101         return NULL;
102
103     if( (p_filter->fmt_out.video.i_height == 0) ||
104         (p_filter->fmt_out.video.i_width == 0) )
105         return NULL;
106
107     /* Request output picture */
108     p_pic_dst = filter_NewPicture( p_filter );
109     if( !p_pic_dst )
110     {
111         picture_Release( p_pic );
112         return NULL;
113     }
114
115     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
116         p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
117     {
118         for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
119         {
120             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
121             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
122             const int i_src_height   = p_filter->fmt_in.video.i_height;
123             const int i_src_width    = p_filter->fmt_in.video.i_width;
124             const int i_dst_height   = p_filter->fmt_out.video.i_height;
125             const int i_dst_width    = p_filter->fmt_out.video.i_width;
126             const int i_dst_visible_lines =
127                                        p_pic_dst->p[i_plane].i_visible_lines;
128             const int i_dst_visible_pitch =
129                                        p_pic_dst->p[i_plane].i_visible_pitch;
130             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
131 #define SHIFT_SIZE 16
132             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
133                                        / i_dst_height;
134             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
135                                        / i_dst_width;
136             const int i_src_height_1 = i_src_height - 1;
137             const int i_src_width_1  = i_src_width - 1;
138
139             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
140             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
141             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
142             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
143
144             const int i_shift_height = i_dst_height / i_src_height;
145             const int i_shift_width = i_dst_width / i_src_width;
146
147             int l = 1<<(SHIFT_SIZE-i_shift_height);
148             for( ; p_dst < p_dstend;
149                  p_dst += i_dst_hidden_pitch,
150                  p_dstendline += i_dst_pitch, l += i_height_coef )
151             {
152                 int k = 1<<(SHIFT_SIZE-i_shift_width);
153                 uint8_t *p_srcl = p_src
154                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
155
156                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
157                 {
158                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
159                 }
160             }
161         }
162     }
163     else /* RGBA */
164     {
165         const int i_src_pitch = p_pic->p->i_pitch;
166         const int i_dst_pitch = p_pic_dst->p->i_pitch;
167         const int i_src_height   = p_filter->fmt_in.video.i_height;
168         const int i_src_width    = p_filter->fmt_in.video.i_width;
169         const int i_dst_height   = p_filter->fmt_out.video.i_height;
170         const int i_dst_width    = p_filter->fmt_out.video.i_width;
171         const int i_dst_visible_lines =
172                                    p_pic_dst->p->i_visible_lines;
173         const int i_dst_visible_pitch =
174                                    p_pic_dst->p->i_visible_pitch;
175         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
176         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
177                                    / i_dst_height;
178         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
179                                    / i_dst_width;
180         const int i_src_height_1 = i_src_height - 1;
181         const int i_src_width_1  = i_src_width - 1;
182
183         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
184         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
185         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
186         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
187
188         const int i_shift_height = i_dst_height / i_src_height;
189         const int i_shift_width = i_dst_width / i_src_width;
190
191         int l = 1<<(SHIFT_SIZE-i_shift_height);
192         for( ; p_dst < p_dstend;
193              p_dst += (i_dst_hidden_pitch>>2),
194              p_dstendline += (i_dst_pitch>>2),
195              l += i_height_coef )
196         {
197             int k = 1<<(SHIFT_SIZE-i_shift_width);
198             uint32_t *p_srcl = p_src
199                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
200             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
201             {
202                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
203             }
204         }
205     }
206
207     picture_CopyProperties( p_pic_dst, p_pic );
208     picture_Release( p_pic );
209     return p_pic_dst;
210 }