| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | 88101189 | static inline int get_unary(GetBitContext *gb, int stop, int len) | |
| 47 | { | ||
| 48 | int i; | ||
| 49 | |||
| 50 |
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180155209 | for(i = 0; i < len && get_bits1(gb) != stop; i++); |
| 51 | 88101189 | 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 | 51335184 | static inline int get_unary_0_33(GetBitContext *gb) | |
| 60 | { | ||
| 61 | 51335184 | return get_unary(gb, 0, 33); | |
| 62 | } | ||
| 63 | |||
| 64 | 16636518 | static inline int get_unary_0_9(GetBitContext *gb) | |
| 65 | { | ||
| 66 | 16636518 | return get_unary(gb, 0, 9); | |
| 67 | } | ||
| 68 | |||
| 69 | #endif /* AVCODEC_UNARY_H */ | ||
| 70 |