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 /*****************************************************************************
38 * filter_sys_t : filter descriptor
39 *****************************************************************************/
46 /****************************************************************************
48 ****************************************************************************/
49 static int OpenFilter ( vlc_object_t * );
50 static void CloseFilter( vlc_object_t * );
52 static picture_t *Filter( filter_t *, picture_t * );
54 /*****************************************************************************
56 *****************************************************************************/
58 set_description( N_("Video scaling filter") )
59 set_capability( "video filter2", 10 )
60 set_callbacks( OpenFilter, CloseFilter )
63 /*****************************************************************************
64 * OpenFilter: probe the filter and return score
65 *****************************************************************************/
66 static int OpenFilter( vlc_object_t *p_this )
68 filter_t *p_filter = (filter_t*)p_this;
71 if( ( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP &&
72 p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVA &&
73 p_filter->fmt_in.video.i_chroma != VLC_CODEC_I420 &&
74 p_filter->fmt_in.video.i_chroma != VLC_CODEC_YV12 &&
75 p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 &&
76 p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA ) ||
77 p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
82 /* Allocate the memory needed to store the decoder's structure */
83 if( ( p_filter->p_sys = p_sys =
84 (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
87 p_filter->pf_video_filter = Filter;
89 msg_Dbg( p_filter, "%ix%i -> %ix%i", p_filter->fmt_in.video.i_width,
90 p_filter->fmt_in.video.i_height, p_filter->fmt_out.video.i_width,
91 p_filter->fmt_out.video.i_height );
96 /*****************************************************************************
97 * CloseFilter: clean up the filter
98 *****************************************************************************/
99 static void CloseFilter( vlc_object_t *p_this )
101 filter_t *p_filter = (filter_t*)p_this;
102 filter_sys_t *p_sys = p_filter->p_sys;
107 /****************************************************************************
108 * Filter: the whole thing
109 ****************************************************************************/
110 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
112 picture_t *p_pic_dst;
115 if( !p_pic ) return NULL;
117 if( (p_filter->fmt_in.video.i_height == 0) ||
118 (p_filter->fmt_in.video.i_width == 0) )
121 if( (p_filter->fmt_out.video.i_height == 0) ||
122 (p_filter->fmt_out.video.i_width == 0) )
125 /* Request output picture */
126 p_pic_dst = filter_NewPicture( p_filter );
129 picture_Release( p_pic );
133 if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGBA &&
134 p_filter->fmt_in.video.i_chroma != VLC_CODEC_RGB32 )
136 for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
138 const int i_src_pitch = p_pic->p[i_plane].i_pitch;
139 const int i_dst_pitch = p_pic_dst->p[i_plane].i_pitch;
140 const int i_src_height = p_filter->fmt_in.video.i_height;
141 const int i_src_width = p_filter->fmt_in.video.i_width;
142 const int i_dst_height = p_filter->fmt_out.video.i_height;
143 const int i_dst_width = p_filter->fmt_out.video.i_width;
144 const int i_dst_visible_lines =
145 p_pic_dst->p[i_plane].i_visible_lines;
146 const int i_dst_visible_pitch =
147 p_pic_dst->p[i_plane].i_visible_pitch;
148 const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
149 #define SHIFT_SIZE 16
150 const int i_height_coef = ( i_src_height << SHIFT_SIZE )
152 const int i_width_coef = ( i_src_width << SHIFT_SIZE )
154 const int i_src_height_1 = i_src_height - 1;
155 const int i_src_width_1 = i_src_width - 1;
157 uint8_t *p_src = p_pic->p[i_plane].p_pixels;
158 uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
159 uint8_t *p_dstendline = p_dst + i_dst_visible_pitch;
160 const uint8_t *p_dstend = p_dst + i_dst_visible_lines*i_dst_pitch;
162 const int i_shift_height = i_dst_height / i_src_height;
163 const int i_shift_width = i_dst_width / i_src_width;
165 int l = 1<<(SHIFT_SIZE-i_shift_height);
166 for( ; p_dst < p_dstend;
167 p_dst += i_dst_hidden_pitch,
168 p_dstendline += i_dst_pitch, l += i_height_coef )
170 int k = 1<<(SHIFT_SIZE-i_shift_width);
171 uint8_t *p_srcl = p_src
172 + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*i_src_pitch);
174 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
176 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
183 const int i_src_pitch = p_pic->p->i_pitch;
184 const int i_dst_pitch = p_pic_dst->p->i_pitch;
185 const int i_src_height = p_filter->fmt_in.video.i_height;
186 const int i_src_width = p_filter->fmt_in.video.i_width;
187 const int i_dst_height = p_filter->fmt_out.video.i_height;
188 const int i_dst_width = p_filter->fmt_out.video.i_width;
189 const int i_dst_visible_lines =
190 p_pic_dst->p->i_visible_lines;
191 const int i_dst_visible_pitch =
192 p_pic_dst->p->i_visible_pitch;
193 const int i_dst_hidden_pitch = i_dst_pitch - i_dst_visible_pitch;
194 const int i_height_coef = ( i_src_height << SHIFT_SIZE )
196 const int i_width_coef = ( i_src_width << SHIFT_SIZE )
198 const int i_src_height_1 = i_src_height - 1;
199 const int i_src_width_1 = i_src_width - 1;
201 uint32_t *p_src = (uint32_t*)p_pic->p->p_pixels;
202 uint32_t *p_dst = (uint32_t*)p_pic_dst->p->p_pixels;
203 uint32_t *p_dstendline = p_dst + (i_dst_visible_pitch>>2);
204 const uint32_t *p_dstend = p_dst + i_dst_visible_lines*(i_dst_pitch>>2);
206 const int i_shift_height = i_dst_height / i_src_height;
207 const int i_shift_width = i_dst_width / i_src_width;
209 int l = 1<<(SHIFT_SIZE-i_shift_height);
210 for( ; p_dst < p_dstend;
211 p_dst += (i_dst_hidden_pitch>>2),
212 p_dstendline += (i_dst_pitch>>2),
215 int k = 1<<(SHIFT_SIZE-i_shift_width);
216 uint32_t *p_srcl = p_src
217 + (__MIN( i_src_height_1, l >> SHIFT_SIZE )*(i_src_pitch>>2));
218 for( ; p_dst < p_dstendline; p_dst++, k += i_width_coef )
220 *p_dst = p_srcl[__MIN( i_src_width_1, k >> SHIFT_SIZE )];
225 picture_CopyProperties( p_pic_dst, p_pic );
226 picture_Release( p_pic );