Chroma modules now exactly implement the "video filter2" capability.
[vlc.git] / modules / video_chroma / grey_yuv.c
1 /*****************************************************************************
2  * grey_yuv.c : grayscale to others conversion module for vlc
3  *****************************************************************************
4  * Copyright (C) 2007, 2008 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Sam Hocevar <sam@zoy.org>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 # include "config.h"
30 #endif
31
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_filter.h>
35 #include <vlc_vout.h>
36
37 #define SRC_FOURCC  "GREY"
38 #define DEST_FOURCC "I420,YUY2"
39
40 /*****************************************************************************
41  * Local and extern prototypes.
42  *****************************************************************************/
43 static int  Activate ( vlc_object_t * );
44
45 static void GREY_I420( filter_t *, picture_t *, picture_t * );
46 static void GREY_YUY2( filter_t *, picture_t *, picture_t * );
47
48 static picture_t *GREY_I420_Filter( filter_t *, picture_t * );
49 static picture_t *GREY_YUY2_Filter( filter_t *, picture_t * );
50
51 /*****************************************************************************
52  * Module descriptor.
53  *****************************************************************************/
54 vlc_module_begin();
55     set_description( N_("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
56     set_capability( "video filter2", 80 );
57     set_callbacks( Activate, NULL );
58 vlc_module_end();
59
60 /*****************************************************************************
61  * Activate: allocate a chroma function
62  *****************************************************************************
63  * This function allocates and initializes a chroma function
64  *****************************************************************************/
65 static int Activate( vlc_object_t *p_this )
66 {
67     filter_t *p_filter = (filter_t *)p_this;
68
69     if( p_filter->fmt_out.video.i_width & 1
70      || p_filter->fmt_out.video.i_height & 1 )
71     {
72         return -1;
73     }
74
75     switch( p_filter->fmt_in.video.i_chroma )
76     {
77         case VLC_FOURCC('Y','8','0','0'):
78             p_filter->fmt_in.video.i_chroma = VLC_FOURCC('G','R','E','Y');
79         case VLC_FOURCC('G','R','E','Y'):
80             switch( p_filter->fmt_out.video.i_chroma )
81             {
82                 case VLC_FOURCC('I','4','2','0'):
83                     p_filter->pf_video_filter = GREY_I420_Filter;
84                     break;
85                 case VLC_FOURCC('Y','U','Y','2'):
86                     p_filter->pf_video_filter = GREY_YUY2_Filter;
87                     break;
88                 default:
89                     return -1;
90             }
91             break;
92
93         default:
94             return -1;
95     }
96
97     return 0;
98 }
99
100 VIDEO_FILTER_WRAPPER( GREY_I420 )
101 VIDEO_FILTER_WRAPPER( GREY_YUY2 )
102
103 /* Following functions are local */
104
105 /*****************************************************************************
106  * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
107  *****************************************************************************/
108 static void GREY_I420( filter_t *p_filter, picture_t *p_source,
109                                            picture_t *p_dest )
110 {
111     uint8_t *p_line = p_source->p->p_pixels;
112     uint8_t *p_y = p_dest->Y_PIXELS;
113     uint8_t *p_u = p_dest->U_PIXELS;
114     uint8_t *p_v = p_dest->V_PIXELS;
115
116     int i_x, i_y;
117
118     const int i_source_margin = p_source->p->i_pitch
119                                  - p_source->p->i_visible_pitch;
120     const int i_dest_margin = p_dest->p[0].i_pitch
121                                - p_dest->p[0].i_visible_pitch;
122     const int i_dest_margin_c = p_dest->p[1].i_pitch
123                                  - p_dest->p[1].i_visible_pitch;
124
125     for( i_y = p_filter->fmt_in.video.i_height / 2; i_y-- ; )
126     {
127         memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
128         p_u += i_dest_margin_c;
129
130         memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
131         p_v += i_dest_margin_c;
132     }
133
134     for( i_y = p_filter->fmt_in.video.i_height; i_y-- ; )
135     {
136         for( i_x = p_filter->fmt_in.video.i_width / 8; i_x-- ; )
137         {
138             *p_y++ = *p_line++; *p_y++ = *p_line++;
139             *p_y++ = *p_line++; *p_y++ = *p_line++;
140             *p_y++ = *p_line++; *p_y++ = *p_line++;
141             *p_y++ = *p_line++; *p_y++ = *p_line++;
142         }
143
144         for( i_x = p_filter->fmt_in.video.i_width % 8; i_x-- ; )
145         {
146             *p_y++ = *p_line++;
147         }
148
149         p_line += i_source_margin;
150         p_y += i_dest_margin;
151     }
152 }
153
154 /*****************************************************************************
155  * GREY_YUY2: 8-bit grayscale to packed YUY2
156  *****************************************************************************/
157 static void GREY_YUY2( filter_t *p_filter, picture_t *p_source,
158                                            picture_t *p_dest )
159 {
160     uint8_t *p_in = p_source->p->p_pixels;
161     uint8_t *p_out = p_dest->p->p_pixels;
162
163     int i_x, i_y;
164
165     const int i_source_margin = p_source->p->i_pitch
166                                  - p_source->p->i_visible_pitch;
167     const int i_dest_margin = p_dest->p->i_pitch
168                                - p_dest->p->i_visible_pitch;
169
170     for( i_y = p_filter->fmt_out.video.i_height; i_y-- ; )
171     {
172         for( i_x = p_filter->fmt_out.video.i_width / 8; i_x-- ; )
173         {
174             *p_out++ = *p_in++; *p_out++ = 0x80;
175             *p_out++ = *p_in++; *p_out++ = 0x80;
176             *p_out++ = *p_in++; *p_out++ = 0x80;
177             *p_out++ = *p_in++; *p_out++ = 0x80;
178             *p_out++ = *p_in++; *p_out++ = 0x80;
179             *p_out++ = *p_in++; *p_out++ = 0x80;
180             *p_out++ = *p_in++; *p_out++ = 0x80;
181             *p_out++ = *p_in++; *p_out++ = 0x80;
182         }
183
184         for( i_x = (p_filter->fmt_out.video.i_width % 8) / 2; i_x-- ; )
185         {
186             *p_out++ = *p_in++; *p_out++ = 0x80;
187             *p_out++ = *p_in++; *p_out++ = 0x80;
188         }
189
190         p_in += i_source_margin;
191         p_out += i_dest_margin;
192     }
193 }
194