| /* |
| * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_UNARY_H |
| #define AVCODEC_UNARY_H |
| |
| #include "get_bits.h" |
| |
| /** |
| * Get unary code of limited length |
| * @param gb GetBitContext |
| * @param[in] stop The bitstop value (unary code of 1's or 0's) |
| * @param[in] len Maximum length |
| * @return unary 0 based code index. This is also the length in bits of the |
| * code excluding the stop bit. |
| * (in case len=1) |
| * 1 0 |
| * 0 1 |
| * (in case len=2) |
| * 1 0 |
| * 01 1 |
| * 00 2 |
| * (in case len=3) |
| * 1 0 |
| * 01 1 |
| * 001 2 |
| * 000 3 |
| */ |
| static inline int get_unary(GetBitContext *gb, int stop, int len) |
| { |
| int i; |
| |
| for(i = 0; i < len && get_bits1(gb) != stop; i++); |
| return i; |
| } |
| |
| /** |
| * Get unary code terminated by a 0 with a maximum length of 33 |
| * @param gb GetBitContext |
| * @return Unary length/index |
| */ |
| static inline int get_unary_0_33(GetBitContext *gb) |
| { |
| return get_unary(gb, 0, 33); |
| } |
| |
| static inline int get_unary_0_9(GetBitContext *gb) |
| { |
| return get_unary(gb, 0, 9); |
| } |
| |
| #endif /* AVCODEC_UNARY_H */ |
