FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mjpegdec_common.c
Date: 2024-11-12 23:50:39
Exec Total Coverage
Lines: 14 14 100.0%
Functions: 2 2 100.0%
Branches: 10 10 100.0%

Line Branch Exec Source
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