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
8 * Authors: Gildas Bazin <gbazin@videolan.org>
9 * Antoine Cellerier <dionoea @t videolan dot org>
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.
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.
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 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_filter.h>
37 /****************************************************************************
39 ****************************************************************************/
40 static int OpenFilter ( vlc_object_t * );
41 static picture_t *Filter( filter_t *, picture_t * );
43 /*****************************************************************************
45 *****************************************************************************/
47 set_description( N_("Video scaling filter") )
48 set_capability( "video filter", 10 )
49 set_callbacks( OpenFilter, NULL )
52 /*****************************************************************************
53 * OpenFilter: probe the filter and return score
54 *****************************************************************************/
55 static int OpenFilter( vlc_object_t *p_this )
57 filter_t *p_filter = (filter_t*)p_this;
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 )
71 if( p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
74 video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
75 p_filter->pf_video_filter = Filter;
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 );
84 /****************************************************************************
85 * Filter: the whole thing
86 ****************************************************************************/
87 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
91 if( !p_pic ) return NULL;
93 video_format_ScaleCropAr( &p_filter->fmt_out.video, &p_filter->fmt_in.video );
95 /* Request output picture */
96 p_pic_dst = filter_NewPicture( p_filter );
99 picture_Release( p_pic );
103 if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
104 p_filter->fmt_in.video.i_chroma != VLC_CODEC_ARGB &&
105 p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
107 for( int i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
109 const int i_src_pitch = p_pic->p[i_plane].i_pitch;
110 const int i_dst_pitch = p_pic_dst->p[i_plane].i_pitch;
111 const int i_src_height = p_filter->fmt_in.video.i_height;
112 const int i_src_width = p_filter->fmt_in.video.i_width;
113 const int i_dst_height = p_filter->fmt_out.video.i_height;
114 const int i_dst_width = p_filter->fmt_out.video.i_width;
115 const int i_dst_visible_lines =
116 p_pic_dst->p[i_plane].i_visible_lines;
117 const int i_dst_visible_pitch =
118 p_pic_dst->p[i_plane].i_visible_pitch;
119 const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
120 #define SHIFT_SIZE 16
121 const int i_height_coef = ( i_src_height << SHIFT_SIZE )
123 const int i_width_coef = ( i_src_width << SHIFT_SIZE )
125 const int i_src_height_1 = i_src_height - 1;
126 const int i_src_width_1 = i_src_width - 1;
128 uint8_t *p_src = p_pic->p[i_plane].p_pixels;
129 uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
130 uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
131 const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
133 const int i_shift_height = i_dst_height / i_src_height;
134 const int i_shift_width = i_dst_width / i_src_width;
136 int l = 1<<(SHIFT_SIZE-i_shift_height);
137 for( ; p_dst < p_dstend;
138 p_dst += i_dst_hidden_pitch,
139 p_dstendline += i_dst_pitch, l += i_height_coef )
141 int k = 1<<(SHIFT_SIZE-i_shift_width);
142 uint8_t *p_srcl = p_src
143 + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
145 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
147 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
154 const int i_src_pitch = p_pic->p->i_pitch;
155 const int i_dst_pitch = p_pic_dst->p->i_pitch;
156 const int i_src_height = p_filter->fmt_in.video.i_height;
157 const int i_src_width = p_filter->fmt_in.video.i_width;
158 const int i_dst_height = p_filter->fmt_out.video.i_height;
159 const int i_dst_width = p_filter->fmt_out.video.i_width;
160 const int i_dst_visible_lines =
161 p_pic_dst->p->i_visible_lines;
162 const int i_dst_visible_pitch =
163 p_pic_dst->p->i_visible_pitch;
164 const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
165 const int i_height_coef = ( i_src_height << SHIFT_SIZE )
167 const int i_width_coef = ( i_src_width << SHIFT_SIZE )
169 const int i_src_height_1 = i_src_height - 1;
170 const int i_src_width_1 = i_src_width - 1;
172 uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
173 uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
174 uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
175 const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
177 const int i_shift_height = i_dst_height / i_src_height;
178 const int i_shift_width = i_dst_width / i_src_width;
180 int l = 1<<(SHIFT_SIZE-i_shift_height);
181 for( ; p_dst < p_dstend;
182 p_dst += (i_dst_hidden_pitch>>2),
183 p_dstendline += (i_dst_pitch>>2),
186 int k = 1<<(SHIFT_SIZE-i_shift_width);
187 uint32_t *p_srcl = p_src
188 + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
189 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
191 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
196 picture_CopyProperties( p_pic_dst, p_pic );
197 picture_Release( p_pic );