/* * ELS (Entropy Logarithmic-Scale) decoder * * Copyright (c) 2013 Maxim Poliakovski * * 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 */ /** * @file * Entropy Logarithmic-Scale binary arithmetic coder */ #ifndef AVCODEC_ELSDEC_H #define AVCODEC_ELSDEC_H #include <stdint.h> #include <sys/types.h> #define ELS_EXPGOLOMB_LEN 10 typedef struct ElsDecCtx { const uint8_t *in_buf; unsigned x; size_t data_size; int j, t, diff, err; } ElsDecCtx; typedef struct ElsRungNode { uint8_t rung; uint16_t next_index; } ElsRungNode; typedef struct ElsUnsignedRung { uint8_t prefix_rung[ELS_EXPGOLOMB_LEN + 1]; ElsRungNode *rem_rung_list; size_t rung_list_size; uint16_t avail_index; } ElsUnsignedRung; void ff_els_decoder_init(ElsDecCtx *ctx, const uint8_t *in, size_t data_size); void ff_els_decoder_uninit(ElsUnsignedRung *rung); int ff_els_decode_bit(ElsDecCtx *ctx, unsigned char *rung); unsigned ff_els_decode_unsigned(ElsDecCtx *ctx, ElsUnsignedRung *ur); #endif /* AVCODEC_ELSDEC_H */