FFmpeg
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 <stdint.h>
28 
29 #include "dvdata.h"
30 
31 /* Specific zigzag scan for 248 idct. NOTE that unlike the
32  * specification, we interleave the fields */
33 const uint8_t ff_dv_zigzag248_direct[64] = {
34  0, 8, 1, 9, 16, 24, 2, 10,
35  17, 25, 32, 40, 48, 56, 33, 41,
36  18, 26, 3, 11, 4, 12, 19, 27,
37  34, 42, 49, 57, 50, 58, 35, 43,
38  20, 28, 5, 13, 6, 14, 21, 29,
39  36, 44, 51, 59, 52, 60, 37, 45,
40  22, 30, 7, 15, 23, 31, 38, 46,
41  53, 61, 54, 62, 39, 47, 55, 63,
42 };
43 
44 /* unquant tables (not used directly) */
45 const uint8_t ff_dv_quant_shifts[22][4] = {
46  { 3, 3, 4, 4 },
47  { 3, 3, 4, 4 },
48  { 2, 3, 3, 4 },
49  { 2, 3, 3, 4 },
50  { 2, 2, 3, 3 },
51  { 2, 2, 3, 3 },
52  { 1, 2, 2, 3 },
53  { 1, 2, 2, 3 },
54  { 1, 1, 2, 2 },
55  { 1, 1, 2, 2 },
56  { 0, 1, 1, 2 },
57  { 0, 1, 1, 2 },
58  { 0, 0, 1, 1 },
59  { 0, 0, 1, 1 },
60  { 0, 0, 0, 1 },
61  { 0, 0, 0, 0 },
62  { 0, 0, 0, 0 },
63  { 0, 0, 0, 0 },
64  { 0, 0, 0, 0 },
65  { 0, 0, 0, 0 },
66  { 0, 0, 0, 0 },
67  { 0, 0, 0, 0 },
68 };
69 
70 const uint8_t ff_dv_quant_offset[4] = { 6, 3, 0, 1 };
71 
72 /*
73  * There's a catch about the following three tables: the mapping they establish
74  * between (run, level) and vlc is not 1-1. So you have to watch out for that
75  * when building misc. tables. E.g. (1, 0) can be either 0x7cf or 0x1f82.
76  */
77 const uint8_t ff_dv_vlc_len[NB_DV_VLC] = {
78  2, 3, 4, 4, 4, 4, 5, 5, 5,
79  5, 6, 6, 6, 6, 7, 7, 7,
80  7, 7, 7, 7, 7, 8, 8, 8,
81  8, 8, 8, 8, 8, 8, 8, 8,
82  8, 8, 8, 8, 8, 9, 9, 9,
83  9, 9, 9, 9, 9, 9, 9, 9,
84  9, 9, 9, 9, 9, 10, 10, 10,
85  10, 10, 10, 10, 11, 11, 11, 11,
86  11, 11, 11, 11, 12, 12, 12, 12,
87  12, 12, 12, 12, 12, 12, 12, 12,
88  12, 12, 12, 12, 12, 12, 12, 12,
89  13, 13, 13, 13, 13, 13, 13, 13,
90  13, 13, 13, 13, 13, 13, 13, 13,
91  13, 13, 13, 13, 13, 13, 13, 13,
92  13, 13, 13, 13, 13, 13, 13, 13,
93  13, 13, 13, 13, 13, 13, 13, 13,
94  13, 13, 13, 13, 13, 13, 13, 13,
95  13, 13, 13, 13, 13, 13, 13, 13,
96  13, 13, 13, 13, 13, 13, 13, 13,
97  15, 15, 15, 15, 15, 15, 15, 15,
98  15, 15, 15, 15, 15, 15, 15, 15,
99  15, 15, 15, 15, 15, 15, 15, 15,
100  15, 15, 15, 15, 15, 15, 15, 15,
101  15, 15, 15, 15, 15, 15, 15, 15,
102  15, 15, 15, 15, 15, 15, 15, 15,
103  15, 15, 15, 15, 15, 15, 15, 15,
104  15, 15, 15, 15, 15, 15, 15, 15,
105  15, 15, 15, 15, 15, 15, 15, 15,
106  15, 15, 15, 15, 15, 15, 15, 15,
107  15, 15, 15, 15, 15, 15, 15, 15,
108  15, 15, 15, 15, 15, 15, 15, 15,
109  15, 15, 15, 15, 15, 15, 15, 15,
110  15, 15, 15, 15, 15, 15, 15, 15,
111  15, 15, 15, 15, 15, 15, 15, 15,
112  15, 15, 15, 15, 15, 15, 15, 15,
113  15, 15, 15, 15, 15, 15, 15, 15,
114  15, 15, 15, 15, 15, 15, 15, 15,
115  15, 15, 15, 15, 15, 15, 15, 15,
116  15, 15, 15, 15, 15, 15, 15, 15,
117  15, 15, 15, 15, 15, 15, 15, 15,
118  15, 15, 15, 15, 15, 15, 15, 15,
119  15, 15, 15, 15, 15, 15, 15, 15,
120  15, 15, 15, 15, 15, 15, 15, 15,
121  15, 15, 15, 15, 15, 15, 15, 15,
122  15, 15, 15, 15, 15, 15, 15, 15,
123  15, 15, 15, 15, 15, 15, 15, 15,
124  15, 15, 15, 15, 15, 15, 15, 15,
125  15, 15, 15, 15, 15, 15, 15, 15,
126  15, 15, 15, 15, 15, 15, 15, 15,
127  15, 15, 15, 15, 15, 15, 15, 15,
128  15, 15, 15, 15, 15, 15, 15, 15,
129 };
130 
131 const uint8_t ff_dv_vlc_run[NB_DV_VLC] = {
132  0, 0, 127, 1, 0, 0, 2, 1, 0,
133  0, 3, 4, 0, 0, 5, 6, 2,
134  1, 1, 0, 0, 0, 7, 8, 9,
135  10, 3, 4, 2, 1, 1, 1, 0,
136  0, 0, 0, 0, 0, 11, 12, 13,
137  14, 5, 6, 3, 4, 2, 2, 1,
138  0, 0, 0, 0, 0, 5, 3, 3,
139  2, 1, 1, 1, 0, 1, 6, 4,
140  3, 1, 1, 1, 2, 3, 4, 5,
141  7, 8, 9, 10, 7, 8, 4, 3,
142  2, 2, 2, 2, 2, 1, 1, 1,
143  0, 1, 2, 3, 4, 5, 6, 7,
144  8, 9, 10, 11, 12, 13, 14, 15,
145  16, 17, 18, 19, 20, 21, 22, 23,
146  24, 25, 26, 27, 28, 29, 30, 31,
147  32, 33, 34, 35, 36, 37, 38, 39,
148  40, 41, 42, 43, 44, 45, 46, 47,
149  48, 49, 50, 51, 52, 53, 54, 55,
150  56, 57, 58, 59, 60, 61, 62, 63,
151  0, 0, 0, 0, 0, 0, 0, 0,
152  0, 0, 0, 0, 0, 0, 0, 0,
153  0, 0, 0, 0, 0, 0, 0, 0,
154  0, 0, 0, 0, 0, 0, 0, 0,
155  0, 0, 0, 0, 0, 0, 0, 0,
156  0, 0, 0, 0, 0, 0, 0, 0,
157  0, 0, 0, 0, 0, 0, 0, 0,
158  0, 0, 0, 0, 0, 0, 0, 0,
159  0, 0, 0, 0, 0, 0, 0, 0,
160  0, 0, 0, 0, 0, 0, 0, 0,
161  0, 0, 0, 0, 0, 0, 0, 0,
162  0, 0, 0, 0, 0, 0, 0, 0,
163  0, 0, 0, 0, 0, 0, 0, 0,
164  0, 0, 0, 0, 0, 0, 0, 0,
165  0, 0, 0, 0, 0, 0, 0, 0,
166  0, 0, 0, 0, 0, 0, 0, 0,
167  0, 0, 0, 0, 0, 0, 0, 0,
168  0, 0, 0, 0, 0, 0, 0, 0,
169  0, 0, 0, 0, 0, 0, 0, 0,
170  0, 0, 0, 0, 0, 0, 0, 0,
171  0, 0, 0, 0, 0, 0, 0, 0,
172  0, 0, 0, 0, 0, 0, 0, 0,
173  0, 0, 0, 0, 0, 0, 0, 0,
174  0, 0, 0, 0, 0, 0, 0, 0,
175  0, 0, 0, 0, 0, 0, 0, 0,
176  0, 0, 0, 0, 0, 0, 0, 0,
177  0, 0, 0, 0, 0, 0, 0, 0,
178  0, 0, 0, 0, 0, 0, 0, 0,
179  0, 0, 0, 0, 0, 0, 0, 0,
180  0, 0, 0, 0, 0, 0, 0, 0,
181  0, 0, 0, 0, 0, 0, 0, 0,
182  0, 0, 0, 0, 0, 0, 0, 0,
183 };
184 
185 const uint8_t ff_dv_vlc_level[NB_DV_VLC] = {
186  1, 2, 0, 1, 3, 4, 1, 2, 5,
187  6, 1, 1, 7, 8, 1, 1, 2,
188  3, 4, 9, 10, 11, 1, 1, 1,
189  1, 2, 2, 3, 5, 6, 7, 12,
190  13, 14, 15, 16, 17, 1, 1, 1,
191  1, 2, 2, 3, 3, 4, 5, 8,
192  18, 19, 20, 21, 22, 3, 4, 5,
193  6, 9, 10, 11, 0, 0, 3, 4,
194  6, 12, 13, 14, 0, 0, 0, 0,
195  2, 2, 2, 2, 3, 3, 5, 7,
196  7, 8, 9, 10, 11, 15, 16, 17,
197  0, 0, 0, 0, 0, 0, 0, 0,
198  0, 0, 0, 0, 0, 0, 0, 0,
199  0, 0, 0, 0, 0, 0, 0, 0,
200  0, 0, 0, 0, 0, 0, 0, 0,
201  0, 0, 0, 0, 0, 0, 0, 0,
202  0, 0, 0, 0, 0, 0, 0, 0,
203  0, 0, 0, 0, 0, 0, 0, 0,
204  0, 0, 0, 0, 0, 0, 0, 0,
205  0, 1, 2, 3, 4, 5, 6, 7,
206  8, 9, 10, 11, 12, 13, 14, 15,
207  16, 17, 18, 19, 20, 21, 22, 23,
208  24, 25, 26, 27, 28, 29, 30, 31,
209  32, 33, 34, 35, 36, 37, 38, 39,
210  40, 41, 42, 43, 44, 45, 46, 47,
211  48, 49, 50, 51, 52, 53, 54, 55,
212  56, 57, 58, 59, 60, 61, 62, 63,
213  64, 65, 66, 67, 68, 69, 70, 71,
214  72, 73, 74, 75, 76, 77, 78, 79,
215  80, 81, 82, 83, 84, 85, 86, 87,
216  88, 89, 90, 91, 92, 93, 94, 95,
217  96, 97, 98, 99, 100, 101, 102, 103,
218  104, 105, 106, 107, 108, 109, 110, 111,
219  112, 113, 114, 115, 116, 117, 118, 119,
220  120, 121, 122, 123, 124, 125, 126, 127,
221  128, 129, 130, 131, 132, 133, 134, 135,
222  136, 137, 138, 139, 140, 141, 142, 143,
223  144, 145, 146, 147, 148, 149, 150, 151,
224  152, 153, 154, 155, 156, 157, 158, 159,
225  160, 161, 162, 163, 164, 165, 166, 167,
226  168, 169, 170, 171, 172, 173, 174, 175,
227  176, 177, 178, 179, 180, 181, 182, 183,
228  184, 185, 186, 187, 188, 189, 190, 191,
229  192, 193, 194, 195, 196, 197, 198, 199,
230  200, 201, 202, 203, 204, 205, 206, 207,
231  208, 209, 210, 211, 212, 213, 214, 215,
232  216, 217, 218, 219, 220, 221, 222, 223,
233  224, 225, 226, 227, 228, 229, 230, 231,
234  232, 233, 234, 235, 236, 237, 238, 239,
235  240, 241, 242, 243, 244, 245, 246, 247,
236  248, 249, 250, 251, 252, 253, 254, 255,
237 };
NB_DV_VLC
#define NB_DV_VLC
Definition: dvdata.h:29
ff_dv_quant_shifts
const uint8_t ff_dv_quant_shifts[22][4]
Definition: dvdata.c:45
ff_dv_zigzag248_direct
const uint8_t ff_dv_zigzag248_direct[64]
Definition: dvdata.c:33
ff_dv_vlc_level
const uint8_t ff_dv_vlc_level[NB_DV_VLC]
Definition: dvdata.c:185
ff_dv_vlc_run
const uint8_t ff_dv_vlc_run[NB_DV_VLC]
Definition: dvdata.c:131
ff_dv_vlc_len
const uint8_t ff_dv_vlc_len[NB_DV_VLC]
Definition: dvdata.c:77
ff_dv_quant_offset
const uint8_t ff_dv_quant_offset[4]
Definition: dvdata.c:70
dvdata.h
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