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revision 195, Wed Jun 12 20:38:41 2002 UTC revision 677, Tue Nov 26 23:44:11 2002 UTC
# Line 1  Line 1 
1    /*****************************************************************************
2     *
3     *  XVID MPEG-4 VIDEO CODEC
4     *  - zigzag dct block scanning -
5     *
6     *  Copyright(C) 2001-2002 Michael Militzer <isibaar@xvid.org>
7     *
8     *  This file is part of XviD, a free MPEG-4 video encoder/decoder
9     *
10     *  XviD is free software; you can redistribute it and/or modify it
11     *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23     *
24     *  Under section 8 of the GNU General Public License, the copyright
25     *  holders of XVID explicitly forbid distribution in the following
26     *  countries:
27     *
28     *    - Japan
29     *    - United States of America
30     *
31     *  Linking XviD statically or dynamically with other modules is making a
32     *  combined work based on XviD.  Thus, the terms and conditions of the
33     *  GNU General Public License cover the whole combination.
34     *
35     *  As a special exception, the copyright holders of XviD give you
36     *  permission to link XviD with independent modules that communicate with
37     *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the
38     *  license terms of these independent modules, and to copy and distribute
39     *  the resulting combined work under terms of your choice, provided that
40     *  every copy of the combined work is accompanied by a complete copy of
41     *  the source code of XviD (the version of XviD used to produce the
42     *  combined work), being distributed under the terms of the GNU General
43     *  Public License plus this exception.  An independent module is a module
44     *  which is not derived from or based on XviD.
45     *
46     *  Note that people who make modified versions of XviD are not obligated
47     *  to grant this special exception for their modified versions; it is
48     *  their choice whether to do so.  The GNU General Public License gives
49     *  permission to release a modified version without this exception; this
50     *  exception also makes it possible to release a modified version which
51     *  carries forward this exception.
52     *
53     * $Id: zigzag.h,v 1.5 2002-11-26 23:44:10 edgomez Exp $
54     *
55     ****************************************************************************/
56    
57  #ifndef _ZIGZAG_H_  #ifndef _ZIGZAG_H_
58  #define _ZIGZAG_H_  #define _ZIGZAG_H_
59    
60  static const uint16_t scan_tables[3][64] = {  static const uint16_t scan_tables[3][64] = {
61          {                                                       // zig_zag_scan          {                                                       /* zig_zag_scan */
62           0, 1, 8, 16, 9, 2, 3, 10,           0, 1, 8, 16, 9, 2, 3, 10,
63           17, 24, 32, 25, 18, 11, 4, 5,           17, 24, 32, 25, 18, 11, 4, 5,
64           12, 19, 26, 33, 40, 48, 41, 34,           12, 19, 26, 33, 40, 48, 41, 34,
# Line 12  Line 68 
68           58, 59, 52, 45, 38, 31, 39, 46,           58, 59, 52, 45, 38, 31, 39, 46,
69           53, 60, 61, 54, 47, 55, 62, 63},           53, 60, 61, 54, 47, 55, 62, 63},
70    
71          {                                                       // horizontal_scan          {                                                       /* horizontal_scan */
72           0, 1, 2, 3, 8, 9, 16, 17,           0, 1, 2, 3, 8, 9, 16, 17,
73           10, 11, 4, 5, 6, 7, 15, 14,           10, 11, 4, 5, 6, 7, 15, 14,
74           13, 12, 19, 18, 24, 25, 32, 33,           13, 12, 19, 18, 24, 25, 32, 33,
# Line 22  Line 78 
78           46, 47, 50, 51, 56, 57, 58, 59,           46, 47, 50, 51, 56, 57, 58, 59,
79           52, 53, 54, 55, 60, 61, 62, 63},           52, 53, 54, 55, 60, 61, 62, 63},
80    
81          {                                                       // vertical_scan          {                                                       /* vertical_scan */
82           0, 8, 16, 24, 1, 9, 2, 10,           0, 8, 16, 24, 1, 9, 2, 10,
83           17, 25, 32, 40, 48, 56, 57, 49,           17, 25, 32, 40, 48, 56, 57, 49,
84           41, 33, 26, 18, 3, 11, 4, 12,           41, 33, 26, 18, 3, 11, 4, 12,
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