Chroma API change. Chromas are now normal video filters (almost).
[vlc.git] / modules / video_chroma / i422_i420.c
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 the VideoLAN team
5  * $Id$
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
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 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 General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, 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_vout.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
50 /*****************************************************************************
51  * Module descriptor
52  *****************************************************************************/
53 vlc_module_begin();
54     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
55     set_capability( "chroma", 60 );
56     set_callbacks( Activate, NULL );
57 vlc_module_end();
58
59 /*****************************************************************************
60  * Activate: allocate a chroma function
61  *****************************************************************************
62  * This function allocates and initializes a chroma function
63  *****************************************************************************/
64 static int Activate( vlc_object_t *p_this )
65 {
66     filter_t *p_filter = (filter_t *)p_this;
67
68     if( p_filter->fmt_in.video.i_width & 1
69      || p_filter->fmt_in.video.i_height & 1 )
70     {
71         return -1;
72     }
73
74     switch( p_filter->fmt_in.video.i_chroma )
75     {
76         case VLC_FOURCC('I','4','2','2'):
77         case VLC_FOURCC('J','4','2','2'):
78             switch( p_filter->fmt_out.video.i_chroma )
79             {
80                 case VLC_FOURCC('I','4','2','0'):
81                 case VLC_FOURCC('I','Y','U','V'):
82                 case VLC_FOURCC('J','4','2','0'):
83                     p_filter->pf_video_filter_io = I422_I420;
84                     break;
85
86                 case VLC_FOURCC('Y','V','1','2'):
87                     p_filter->pf_video_filter_io = I422_YV12;
88                     break;
89
90                 case VLC_FOURCC('Y','U','V','A'):
91                     p_filter->pf_video_filter_io = I422_YUVA;
92                     break;
93
94                 default:
95                     return -1;
96             }
97             break;
98
99         default:
100             return -1;
101     }
102     return 0;
103 }
104
105 /* Following functions are local */
106
107 /*****************************************************************************
108  * I422_I420: planar YUV 4:2:2 to planar I420 4:2:0 Y:U:V
109  *****************************************************************************/
110 static void I422_I420( filter_t *p_filter, picture_t *p_source,
111                                            picture_t *p_dest )
112 {
113     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
114     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
115     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
116     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
117     uint16_t i_width = p_filter->fmt_in.video.i_width;
118     uint16_t i_y = p_filter->fmt_in.video.i_height;
119     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
120     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
121     uint8_t *p_du = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv;
122     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
123     uint8_t *p_dv = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv;
124     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
125     i_y /= 2;
126
127     for ( ; i_y--; )
128     {
129         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
130         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
131         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
132         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
133     }
134 }
135
136 /*****************************************************************************
137  * I422_YV12: planar YUV 4:2:2 to planar YV12 4:2:0 Y:V:U
138  *****************************************************************************/
139 static void I422_YV12( filter_t *p_filter, picture_t *p_source,
140                                            picture_t *p_dest )
141 {
142     uint16_t i_dpy = p_dest->p[Y_PLANE].i_pitch;
143     uint16_t i_spy = p_source->p[Y_PLANE].i_pitch;
144     uint16_t i_dpuv = p_dest->p[U_PLANE].i_pitch;
145     uint16_t i_spuv = p_source->p[U_PLANE].i_pitch;
146     uint16_t i_width = p_filter->fmt_in.video.i_width;
147     uint16_t i_y = p_filter->fmt_in.video.i_height;
148     uint8_t *p_dy = p_dest->Y_PIXELS + (i_y-1)*i_dpy;
149     uint8_t *p_y = p_source->Y_PIXELS + (i_y-1)*i_spy;
150     uint8_t *p_du = p_dest->V_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
151     uint8_t *p_u = p_source->U_PIXELS + (i_y-1)*i_spuv;
152     uint8_t *p_dv = p_dest->U_PIXELS + (i_y/2-1)*i_dpuv; /* U and V are swapped */
153     uint8_t *p_v = p_source->V_PIXELS + (i_y-1)*i_spuv;
154     i_y /= 2;
155
156     for ( ; i_y--; )
157     {
158         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
159         vlc_memcpy(p_dy, p_y, i_width); p_dy -= i_dpy; p_y -= i_spy;
160         vlc_memcpy(p_du, p_u, i_width/2); p_du -= i_dpuv; p_u -= 2*i_spuv;
161         vlc_memcpy(p_dv, p_v, i_width/2); p_dv -= i_dpuv; p_v -= 2*i_spuv;
162     }
163 }
164
165 /*****************************************************************************
166  * I422_YUVA: planar YUV 4:2:2 to planar YUVA 4:2:0:4 Y:U:V:A
167  *****************************************************************************/
168 static void I422_YUVA( filter_t *p_filter, picture_t *p_source,
169                                            picture_t *p_dest )
170 {
171     I422_I420( p_filter, p_source, p_dest );
172     vlc_memset( p_dest->p[A_PLANE].p_pixels, 0xff,
173                 p_dest->p[A_PLANE].i_lines * p_dest->p[A_PLANE].i_pitch );
174 }