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unary.h
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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 length/index
32  */
33 static inline int get_unary(GetBitContext *gb, int stop, int len)
34 {
35  int i;
36 
37  for(i = 0; i < len && get_bits1(gb) != stop; i++);
38  return i;
39 }
40 
41 /**
42  * Get unary code terminated by a 0 with a maximum length of 33
43  * @param gb GetBitContext
44  * @return Unary length/index
45  */
46 static inline int get_unary_0_33(GetBitContext *gb)
47 {
48  return get_unary(gb, 0, 33);
49 }
50 
51 static inline int get_unary_0_9(GetBitContext *gb)
52 {
53  return get_unary(gb, 0, 9);
54 }
55 
56 #endif /* AVCODEC_UNARY_H */