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mpeg12decdata.h
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1 /*
2  * MPEG1/2 decoder tables
3  * copyright (c) 2000,2001 Fabrice Bellard
4  * copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * MPEG1/2 decoder tables.
26  */
27 
28 #ifndef AVCODEC_MPEG12DECDATA_H
29 #define AVCODEC_MPEG12DECDATA_H
30 
31 #include <stdint.h>
32 #include "mpegvideo.h"
33 
34 
35 #define MB_TYPE_ZERO_MV 0x20000000
36 #define IS_ZERO_MV(a) ((a)&MB_TYPE_ZERO_MV)
37 
38 static const uint8_t table_mb_ptype[7][2] = {
39  { 3, 5 }, // 0x01 MB_INTRA
40  { 1, 2 }, // 0x02 MB_PAT
41  { 1, 3 }, // 0x08 MB_FOR
42  { 1, 1 }, // 0x0A MB_FOR|MB_PAT
43  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
44  { 1, 5 }, // 0x12 MB_QUANT|MB_PAT
45  { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
46 };
47 
48 static const uint32_t ptype2mb_type[7] = {
51  MB_TYPE_L0,
52  MB_TYPE_L0 | MB_TYPE_CBP,
55  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
56 };
57 
58 static const uint8_t table_mb_btype[11][2] = {
59  { 3, 5 }, // 0x01 MB_INTRA
60  { 2, 3 }, // 0x04 MB_BACK
61  { 3, 3 }, // 0x06 MB_BACK|MB_PAT
62  { 2, 4 }, // 0x08 MB_FOR
63  { 3, 4 }, // 0x0A MB_FOR|MB_PAT
64  { 2, 2 }, // 0x0C MB_FOR|MB_BACK
65  { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT
66  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
67  { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT
68  { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
69  { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT
70 };
71 
72 static const uint32_t btype2mb_type[11] = {
74  MB_TYPE_L1,
75  MB_TYPE_L1 | MB_TYPE_CBP,
76  MB_TYPE_L0,
77  MB_TYPE_L0 | MB_TYPE_CBP,
79  MB_TYPE_L0L1 | MB_TYPE_CBP,
81  MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
82  MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
83  MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
84 };
85 
86 static const uint8_t non_linear_qscale[32] = {
87  0, 1, 2, 3, 4, 5, 6, 7,
88  8,10,12,14,16,18,20,22,
89  24,28,32,36,40,44,48,52,
90  56,64,72,80,88,96,104,112,
91 };
92 
93 #endif /* AVCODEC_MPEG12DECDATA_H */