1 /*****************************************************************************
2 * i422_i420.c : Planar YUV 4:2:2 to Planar YUV 4:2:0 conversion module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000, 2001 - 2007 VLC authors and VideoLAN
5 * $Id: 59930989d9de98717b8a0cdc54a9fa9e8f344dea $
6 *
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Damien Fouilleul <damienf@videolan.org>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
24
25 /*****************************************************************************
26 * Preamble
27 *****************************************************************************/
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 #include <vlc_picture.h>
37
38 #define SRC_FOURCC "I422,J422"
39 #define DEST_FOURCC "I420,IYUV,J420,YV12,YUVA"
40
41 /*****************************************************************************
42 * Local and extern prototypes.
43 *****************************************************************************/
44 static int Activate ( vlc_object_t * );
45
46 static void I422_I420( filter_t *, picture_t *, picture_t * );
47 static void I422_YV12( filter_t *, picture_t *, picture_t * );
48 static void I422_YUVA( filter_t *, picture_t *, picture_t * );
49 static picture_t *I422_I420_Filter( filter_t *, picture_t * );
50 static picture_t *I422_YV12_Filter( filter_t *, picture_t * );
51 static picture_t *I422_YUVA_Filter( filter_t *, picture_t * );
52
53 /*****************************************************************************
54 * Module descriptor
55 *****************************************************************************/
56 vlc_module_begin ()
57 set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) )
58 set_capability( "video converter", 60 )
set_callbacks(Activate,NULL)59 set_callbacks( Activate, NULL )
60 vlc_module_end ()
61
62 /*****************************************************************************
63 * Activate: allocate a chroma function
64 *****************************************************************************
65 * This function allocates and initializes a chroma function
66 *****************************************************************************/
67 static int Activate( vlc_object_t *p_this )
68 {
69 filter_t *p_filter = (filter_t *)p_this;
70
71 if( p_filter->fmt_in.video.i_width & 1
72 || p_filter->fmt_in.video.i_height & 1 )
73 {
74 return -1;
75 }
76
77 if( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width
78 || p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height
79 || p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
80 return -1;
81
82 switch( p_filter->fmt_in.video.i_chroma )
83 {
84 case VLC_CODEC_I422:
85 case VLC_CODEC_J422:
86 switch( p_filter->fmt_out.video.i_chroma )
87 {
88 case VLC_CODEC_I420:
89 case VLC_CODEC_J420:
90 p_filter->pf_video_filter = I422_I420_Filter;
91 break;
92
93 case VLC_CODEC_YV12:
94 p_filter->pf_video_filter = I422_YV12_Filter;
95 break;
96
97 case VLC_CODEC_YUV420A:
98 p_filter->pf_video_filter = I422_YUVA_Filter;
99 break;
100
101 default:
102 return -1;
103 }
104 break;
105
106 default:
107 return -1;
108 }
109 return 0;
110 }
111
112 /* Following functions are local */
113 VIDEO_FILTER_WRAPPER( I422_I420 )
VIDEO_FILTER_WRAPPER(I422_YV12)114 VIDEO_FILTER_WRAPPER( I422_YV12 )
115 VIDEO_FILTER_WRAPPER( I422_YUVA )
116
117 /*****************************************************************************
118 * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
119 *****************************************************************************/
120 static void I422_I420( filter_t *p_filter, picture_t *p_source,
121 picture_t *p_dest )
122 {
123 uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
124 uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
125 uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
126 uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
127 uint16_t i_width = p_filter->fmt_in.video.i_width;
128 uint16_t i_y = p_filter->fmt_in.video.i_height;
129 uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
130 uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
131 uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
132 uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
133 uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
134 uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
135 i_y /= 2;
136
137 for ( ; i_y--; )
138 {
139 memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
140 memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
141 memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
142 memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
143 }
144 }
145
146 /*****************************************************************************
147 * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
148 *****************************************************************************/
I422_YV12(filter_t * p_filter,picture_t * p_source,picture_t * p_dest)149 static void I422_YV12( filter_t *p_filter, picture_t *p_source,
150 picture_t *p_dest )
151 {
152 uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
153 uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
154 uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
155 uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
156 uint16_t i_width = p_filter->fmt_in.video.i_width;
157 uint16_t i_y = p_filter->fmt_in.video.i_height;
158 uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
159 uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
160 uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
161 uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
162 uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
163 uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
164 i_y /= 2;
165
166 for ( ; i_y--; )
167 {
168 memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
169 memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
170 memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
171 memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
172 }
173 }
174
175 /*****************************************************************************
176 * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
177 *****************************************************************************/
I422_YUVA(filter_t * p_filter,picture_t * p_source,picture_t * p_dest)178 static void I422_YUVA( filter_t *p_filter, picture_t *p_source,
179 picture_t *p_dest )
180 {
181 I422_I420( p_filter, p_source, p_dest );
182 memset( p_dest->p[A_PLANE].p_pixels, 0xff,
183 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
184 }
185