/* * 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 */