| 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 */ |