upnp: remove m_server_list_lock, p_server_list is already protected by s_lock
[vlc.git] / modules / video_filter / scale.c
1 /*****************************************************************************
2  * scale.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 VLC authors and VideoLAN
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 it
12  * under the terms of the GNU Lesser General Public License as published by
13  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public License
22  * along with this program; if not, write to the Free Software Foundation,
23  * 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 picture_t *Filter( filter_t *, picture_t * );
42
43 /*****************************************************************************
44  * Module descriptor
45  *****************************************************************************/
46 vlc_module_begin ()
47     set_description( N_("Video scaling filter") )
48     set_capability( "video filter2", 10 )
49     set_callbacks( OpenFilter, NULL )
50 vlc_module_end ()
51
52 /*****************************************************************************
53  * OpenFilter: probe the filter and return score
54  *****************************************************************************/
55 static int OpenFilter( vlc_object_t *p_this )
56 {
57     filter_t *p_filter = (filter_t*)p_this;
58
59     if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
60           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
61           p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
62           p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
63           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
64           p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
65           p_filter->fmt_in.video.i_chroma != VLC_CODEC_ARGB ) ||
66         p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
67     {
68         return VLC_EGENERIC;
69     }
70
71     if( p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
72         return VLC_EGENERIC;
73
74     video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
75     p_filter->pf_video_filter = Filter;
76
77     msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
78              p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
79              p_filter->fmt_out.video.i_height );
80
81     return VLC_SUCCESS;
82 }
83
84 /****************************************************************************
85  * Filter: the whole thing
86  ****************************************************************************/
87 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
88 {
89     picture_t *p_pic_dst;
90
91     if( !p_pic ) return NULL;
92
93     if( (p_filter->fmt_in.video.i_height == 0) ||
94         (p_filter->fmt_in.video.i_width == 0) )
95         return NULL;
96
97     if( (p_filter->fmt_out.video.i_height == 0) ||
98         (p_filter->fmt_out.video.i_width == 0) )
99         return NULL;
100
101     video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
102
103     /* Request output picture */
104     p_pic_dst = filter_NewPicture( p_filter );
105     if( !p_pic_dst )
106     {
107         picture_Release( p_pic );
108         return NULL;
109     }
110
111     if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
112         p_filter->fmt_in.video.i_chroma != VLC_CODEC_ARGB &&
113         p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
114     {
115         for( int i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
116         {
117             const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
118             const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
119             const int i_src_height   = p_filter->fmt_in.video.i_height;
120             const int i_src_width    = p_filter->fmt_in.video.i_width;
121             const int i_dst_height   = p_filter->fmt_out.video.i_height;
122             const int i_dst_width    = p_filter->fmt_out.video.i_width;
123             const int i_dst_visible_lines =
124                                        p_pic_dst->p[i_plane].i_visible_lines;
125             const int i_dst_visible_pitch =
126                                        p_pic_dst->p[i_plane].i_visible_pitch;
127             const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
128 #define SHIFT_SIZE 16
129             const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
130                                        / i_dst_height;
131             const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
132                                        / i_dst_width;
133             const int i_src_height_1 = i_src_height - 1;
134             const int i_src_width_1  = i_src_width - 1;
135
136             uint8_t *p_src = p_pic->p[i_plane].p_pixels;
137             uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
138             uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
139             const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
140
141             const int i_shift_height = i_dst_height / i_src_height;
142             const int i_shift_width = i_dst_width / i_src_width;
143
144             int l = 1<<(SHIFT_SIZE-i_shift_height);
145             for( ; p_dst < p_dstend;
146                  p_dst += i_dst_hidden_pitch,
147                  p_dstendline += i_dst_pitch, l += i_height_coef )
148             {
149                 int k = 1<<(SHIFT_SIZE-i_shift_width);
150                 uint8_t *p_srcl = p_src
151                        + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
152
153                 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
154                 {
155                     *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
156                 }
157             }
158         }
159     }
160     else /* RGBA */
161     {
162         const int i_src_pitch = p_pic->p->i_pitch;
163         const int i_dst_pitch = p_pic_dst->p->i_pitch;
164         const int i_src_height   = p_filter->fmt_in.video.i_height;
165         const int i_src_width    = p_filter->fmt_in.video.i_width;
166         const int i_dst_height   = p_filter->fmt_out.video.i_height;
167         const int i_dst_width    = p_filter->fmt_out.video.i_width;
168         const int i_dst_visible_lines =
169                                    p_pic_dst->p->i_visible_lines;
170         const int i_dst_visible_pitch =
171                                    p_pic_dst->p->i_visible_pitch;
172         const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
173         const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
174                                    / i_dst_height;
175         const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
176                                    / i_dst_width;
177         const int i_src_height_1 = i_src_height - 1;
178         const int i_src_width_1  = i_src_width - 1;
179
180         uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
181         uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
182         uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
183         const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
184
185         const int i_shift_height = i_dst_height / i_src_height;
186         const int i_shift_width = i_dst_width / i_src_width;
187
188         int l = 1<<(SHIFT_SIZE-i_shift_height);
189         for( ; p_dst < p_dstend;
190              p_dst += (i_dst_hidden_pitch>>2),
191              p_dstendline += (i_dst_pitch>>2),
192              l += i_height_coef )
193         {
194             int k = 1<<(SHIFT_SIZE-i_shift_width);
195             uint32_t *p_srcl = p_src
196                     + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
197             for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
198             {
199                 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
200             }
201         }
202     }
203
204     picture_CopyProperties( p_pic_dst, p_pic );
205     picture_Release( p_pic );
206     return p_pic_dst;
207 }