FFmpeg
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dvdata.c
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1 /*
2  * Constants for DV codec
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Constants for DV codec.
25  */
26 
27 #include "avcodec.h"
28 #include "dvdata.h"
29 
30 /* unquant tables (not used directly) */
31 const uint8_t ff_dv_quant_shifts[22][4] = {
32  { 3,3,4,4 },
33  { 3,3,4,4 },
34  { 2,3,3,4 },
35  { 2,3,3,4 },
36  { 2,2,3,3 },
37  { 2,2,3,3 },
38  { 1,2,2,3 },
39  { 1,2,2,3 },
40  { 1,1,2,2 },
41  { 1,1,2,2 },
42  { 0,1,1,2 },
43  { 0,1,1,2 },
44  { 0,0,1,1 },
45  { 0,0,1,1 },
46  { 0,0,0,1 },
47  { 0,0,0,0 },
48  { 0,0,0,0 },
49  { 0,0,0,0 },
50  { 0,0,0,0 },
51  { 0,0,0,0 },
52  { 0,0,0,0 },
53  { 0,0,0,0 },
54 };
55 
56 const uint8_t ff_dv_quant_offset[4] = { 6, 3, 0, 1 };
57 
58 const int ff_dv_iweight_88[64] = {
59  32768, 16710, 16710, 17735, 17015, 17735, 18197, 18079,
60  18079, 18197, 18725, 18559, 19196, 18559, 18725, 19284,
61  19108, 19692, 19692, 19108, 19284, 21400, 19645, 20262,
62  20214, 20262, 19645, 21400, 22733, 21845, 20867, 20815,
63  20815, 20867, 21845, 22733, 23173, 23173, 21400, 21400,
64  21400, 23173, 23173, 24600, 23764, 22017, 22017, 23764,
65  24600, 25267, 24457, 22672, 24457, 25267, 25971, 25191,
66  25191, 25971, 26715, 27962, 26715, 29642, 29642, 31536,
67 };
68 const int ff_dv_iweight_248[64] = {
69  32768, 17735, 16710, 18079, 18725, 21400, 17735, 19196,
70  19108, 21845, 16384, 17735, 18725, 21400, 16710, 18079,
71  20262, 23173, 18197, 19692, 18725, 20262, 20815, 23764,
72  17735, 19196, 19108, 21845, 20262, 23173, 18197, 19692,
73  21400, 24457, 19284, 20867, 21400, 23173, 22017, 25191,
74  18725, 20262, 20815, 23764, 21400, 24457, 19284, 20867,
75  24457, 27962, 22733, 24600, 25971, 29642, 21400, 23173,
76  22017, 25191, 24457, 27962, 22733, 24600, 25971, 29642,
77 };
78 
79 /**
80  * The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
81  */
82 const int ff_dv_iweight_1080_y[64] = {
83  128, 16, 16, 17, 17, 17, 18, 18,
84  18, 18, 18, 18, 19, 18, 18, 19,
85  19, 19, 19, 19, 19, 42, 38, 40,
86  40, 40, 38, 42, 44, 43, 41, 41,
87  41, 41, 43, 44, 45, 45, 42, 42,
88  42, 45, 45, 48, 46, 43, 43, 46,
89  48, 49, 48, 44, 48, 49, 101, 98,
90  98, 101, 104, 109, 104, 116, 116, 123,
91 };
92 const int ff_dv_iweight_1080_c[64] = {
93  128, 16, 16, 17, 17, 17, 25, 25,
94  25, 25, 26, 25, 26, 25, 26, 26,
95  26, 27, 27, 26, 26, 42, 38, 40,
96  40, 40, 38, 42, 44, 43, 41, 41,
97  41, 41, 43, 44, 91, 91, 84, 84,
98  84, 91, 91, 96, 93, 86, 86, 93,
99  96, 197, 191, 177, 191, 197, 203, 197,
100  197, 203, 209, 219, 209, 232, 232, 246,
101 };
102 const int ff_dv_iweight_720_y[64] = {
103  128, 16, 16, 17, 17, 17, 18, 18,
104  18, 18, 18, 18, 19, 18, 18, 19,
105  19, 19, 19, 19, 19, 42, 38, 40,
106  40, 40, 38, 42, 44, 43, 41, 41,
107  41, 41, 43, 44, 68, 68, 63, 63,
108  63, 68, 68, 96, 92, 86, 86, 92,
109  96, 98, 96, 88, 96, 98, 202, 196,
110  196, 202, 208, 218, 208, 232, 232, 246,
111 };
112 const int ff_dv_iweight_720_c[64] = {
113  128, 24, 24, 26, 26, 26, 36, 36,
114  36, 36, 36, 36, 38, 36, 36, 38,
115  38, 38, 38, 38, 38, 84, 76, 80,
116  80, 80, 76, 84, 88, 86, 82, 82,
117  82, 82, 86, 88, 182, 182, 168, 168,
118  168, 182, 182, 192, 186, 192, 172, 186,
119  192, 394, 382, 354, 382, 394, 406, 394,
120  394, 406, 418, 438, 418, 464, 464, 492,
121 };
122