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
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
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.
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.
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 *****************************************************************************/
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 void CloseFilter( vlc_object_t * );
43 static picture_t *Filter( filter_t *, picture_t * );
45 /*****************************************************************************
47 *****************************************************************************/
49 set_description( N_("Video scaling filter") )
50 set_capability( "video filter2", 10 )
51 set_callbacks( OpenFilter, CloseFilter )
54 /*****************************************************************************
55 * OpenFilter: probe the filter and return score
56 *****************************************************************************/
57 static int OpenFilter( vlc_object_t *p_this )
59 filter_t *p_filter = (filter_t*)p_this;
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 )
72 p_filter->pf_video_filter = Filter;
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 );
81 /*****************************************************************************
82 * CloseFilter: clean up the filter
83 *****************************************************************************/
84 static void CloseFilter( vlc_object_t *p_this )
89 /****************************************************************************
90 * Filter: the whole thing
91 ****************************************************************************/
92 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
97 if( !p_pic ) return NULL;
99 if( (p_filter->fmt_in.video.i_height == 0) ||
100 (p_filter->fmt_in.video.i_width == 0) )
103 if( (p_filter->fmt_out.video.i_height == 0) ||
104 (p_filter->fmt_out.video.i_width == 0) )
107 /* Request output picture */
108 p_pic_dst = filter_NewPicture( p_filter );
111 picture_Release( p_pic );
115 if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
116 p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
118 for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
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 )
134 const int i_width_coef = ( i_src_width << SHIFT_SIZE )
136 const int i_src_height_1 = i_src_height - 1;
137 const int i_src_width_1 = i_src_width - 1;
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;
144 const int i_shift_height = i_dst_height / i_src_height;
145 const int i_shift_width = i_dst_width / i_src_width;
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 )
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);
156 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
158 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
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 )
178 const int i_width_coef = ( i_src_width << SHIFT_SIZE )
180 const int i_src_height_1 = i_src_height - 1;
181 const int i_src_width_1 = i_src_width - 1;
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);
188 const int i_shift_height = i_dst_height / i_src_height;
189 const int i_shift_width = i_dst_width / i_src_width;
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),
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 )
202 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
207 picture_CopyProperties( p_pic_dst, p_pic );
208 picture_Release( p_pic );