FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/unary.h
Date: 2021-09-26 18:22:30
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Lines: 7 7 100.0%
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1 /*
2 * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_UNARY_H
22 #define AVCODEC_UNARY_H
23
24 #include "get_bits.h"
25
26 /**
27 * Get unary code of limited length
28 * @param gb GetBitContext
29 * @param[in] stop The bitstop value (unary code of 1's or 0's)
30 * @param[in] len Maximum length
31 * @return unary 0 based code index. This is also the length in bits of the
32 * code excluding the stop bit.
33 * (in case len=1)
34 * 1 0
35 * 0 1
36 * (in case len=2)
37 * 1 0
38 * 01 1
39 * 00 2
40 * (in case len=3)
41 * 1 0
42 * 01 1
43 * 001 2
44 * 000 3
45 */
46 85711592 static inline int get_unary(GetBitContext *gb, int stop, int len)
47 {
48 int i;
49
50
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175620926 for(i = 0; i < len && get_bits1(gb) != stop; i++);
51 85711592 return i;
52 }
53
54 /**
55 * Get unary code terminated by a 0 with a maximum length of 33
56 * @param gb GetBitContext
57 * @return Unary length/index
58 */
59 51335183 static inline int get_unary_0_33(GetBitContext *gb)
60 {
61 51335183 return get_unary(gb, 0, 33);
62 }
63
64 16589182 static inline int get_unary_0_9(GetBitContext *gb)
65 {
66 16589182 return get_unary(gb, 0, 9);
67 }
68
69 #endif /* AVCODEC_UNARY_H */
70