Line | Branch | Exec | Source |
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1 | /* | ||
2 | * MJPEG decoder VLC code | ||
3 | * Copyright (c) 2000, 2001 Fabrice Bellard | ||
4 | * Copyright (c) 2003 Alex Beregszaszi | ||
5 | * Copyright (c) 2003-2004 Michael Niedermayer | ||
6 | * | ||
7 | * This file is part of FFmpeg. | ||
8 | * | ||
9 | * FFmpeg is free software; you can redistribute it and/or | ||
10 | * modify it under the terms of the GNU Lesser General Public | ||
11 | * License as published by the Free Software Foundation; either | ||
12 | * version 2.1 of the License, or (at your option) any later version. | ||
13 | * | ||
14 | * FFmpeg is distributed in the hope that it will be useful, | ||
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
17 | * Lesser General Public License for more details. | ||
18 | * | ||
19 | * You should have received a copy of the GNU Lesser General Public | ||
20 | * License along with FFmpeg; if not, write to the Free Software | ||
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
22 | */ | ||
23 | |||
24 | #include <stdint.h> | ||
25 | #include "libavutil/avassert.h" | ||
26 | #include "mjpegdec.h" | ||
27 | #include "vlc.h" | ||
28 | |||
29 | 15192 | static int build_huffman_codes(uint8_t *huff_size, const uint8_t *bits_table) | |
30 | { | ||
31 | 15192 | int nb_codes = 0; | |
32 |
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258264 | for (int i = 1, j = 0; i <= 16; i++) { |
33 | 243072 | nb_codes += bits_table[i]; | |
34 | av_assert1(nb_codes <= 256); | ||
35 |
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1248208 | for (; j < nb_codes; j++) |
36 | 1005136 | huff_size[j] = i; | |
37 | } | ||
38 | 15192 | return nb_codes; | |
39 | } | ||
40 | |||
41 | 15192 | int ff_mjpeg_build_vlc(VLC *vlc, const uint8_t *bits_table, | |
42 | const uint8_t *val_table, int is_ac, void *logctx) | ||
43 | { | ||
44 | uint8_t huff_size[256]; | ||
45 | uint16_t huff_sym[256]; | ||
46 | 15192 | int nb_codes = build_huffman_codes(huff_size, bits_table); | |
47 | |||
48 |
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1020328 | for (int i = 0; i < nb_codes; i++) { |
49 | 1005136 | huff_sym[i] = val_table[i] + 16 * is_ac; | |
50 | |||
51 |
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1005136 | if (is_ac && !val_table[i]) |
52 | 5081 | huff_sym[i] = 16 * 256; | |
53 | } | ||
54 | |||
55 | 15192 | return ff_vlc_init_from_lengths(vlc, 9, nb_codes, huff_size, 1, | |
56 | huff_sym, 2, 2, 0, 0, logctx); | ||
57 | } | ||
58 |