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/***************************************************************************** |
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* |
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* XVID MPEG-4 VIDEO CODEC |
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* - zigzag dct block scanning - |
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* |
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* Copyright(C) 2001-2002 Michael Militzer <isibaar@xvid.org> |
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* |
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* This file is part of XviD, a free MPEG-4 video encoder/decoder |
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* |
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* XviD is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* Under section 8 of the GNU General Public License, the copyright |
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* holders of XVID explicitly forbid distribution in the following |
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* countries: |
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* |
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* - Japan |
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* - United States of America |
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* |
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* Linking XviD statically or dynamically with other modules is making a |
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* combined work based on XviD. Thus, the terms and conditions of the |
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* GNU General Public License cover the whole combination. |
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* |
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* As a special exception, the copyright holders of XviD give you |
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* permission to link XviD with independent modules that communicate with |
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* XviD solely through the VFW1.1 and DShow interfaces, regardless of the |
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* license terms of these independent modules, and to copy and distribute |
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* the resulting combined work under terms of your choice, provided that |
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* every copy of the combined work is accompanied by a complete copy of |
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* the source code of XviD (the version of XviD used to produce the |
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* combined work), being distributed under the terms of the GNU General |
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* Public License plus this exception. An independent module is a module |
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* which is not derived from or based on XviD. |
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* |
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* Note that people who make modified versions of XviD are not obligated |
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* to grant this special exception for their modified versions; it is |
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* their choice whether to do so. The GNU General Public License gives |
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* permission to release a modified version without this exception; this |
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* exception also makes it possible to release a modified version which |
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* carries forward this exception. |
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* |
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* $Id$ |
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* |
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****************************************************************************/ |
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1 |
#ifndef _ZIGZAG_H_ |
#ifndef _ZIGZAG_H_ |
2 |
#define _ZIGZAG_H_ |
#define _ZIGZAG_H_ |
3 |
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4 |
static const uint16_t scan_tables[3][64] = { |
static const uint16_t scan_tables[3][64] = { |
5 |
{ /* zig_zag_scan */ |
{ // zig_zag_scan |
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0, 1, 8, 16, 9, 2, 3, 10, |
0, 1, 8, 16, 9, 2, 3, 10, |
7 |
17, 24, 32, 25, 18, 11, 4, 5, |
17, 24, 32, 25, 18, 11, 4, 5, |
8 |
12, 19, 26, 33, 40, 48, 41, 34, |
12, 19, 26, 33, 40, 48, 41, 34, |
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58, 59, 52, 45, 38, 31, 39, 46, |
58, 59, 52, 45, 38, 31, 39, 46, |
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53, 60, 61, 54, 47, 55, 62, 63}, |
53, 60, 61, 54, 47, 55, 62, 63}, |
14 |
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{ /* horizontal_scan */ |
{ // horizontal_scan |
16 |
0, 1, 2, 3, 8, 9, 16, 17, |
0, 1, 2, 3, 8, 9, 16, 17, |
17 |
10, 11, 4, 5, 6, 7, 15, 14, |
10, 11, 4, 5, 6, 7, 15, 14, |
18 |
13, 12, 19, 18, 24, 25, 32, 33, |
13, 12, 19, 18, 24, 25, 32, 33, |
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46, 47, 50, 51, 56, 57, 58, 59, |
46, 47, 50, 51, 56, 57, 58, 59, |
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52, 53, 54, 55, 60, 61, 62, 63}, |
52, 53, 54, 55, 60, 61, 62, 63}, |
24 |
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25 |
{ /* vertical_scan */ |
{ // vertical_scan |
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0, 8, 16, 24, 1, 9, 2, 10, |
0, 8, 16, 24, 1, 9, 2, 10, |
27 |
17, 25, 32, 40, 48, 56, 57, 49, |
17, 25, 32, 40, 48, 56, 57, 49, |
28 |
41, 33, 26, 18, 3, 11, 4, 12, |
41, 33, 26, 18, 3, 11, 4, 12, |