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60 lines
1.7 KiB
60 lines
1.7 KiB
/* |
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* ELS (Entropy Logarithmic-Scale) decoder |
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* |
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* Copyright (c) 2013 Maxim Poliakovski |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Entropy Logarithmic-Scale binary arithmetic coder |
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*/ |
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#ifndef AVCODEC_ELSDEC_H |
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#define AVCODEC_ELSDEC_H |
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#include <stdint.h> |
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#include <sys/types.h> |
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#define ELS_EXPGOLOMB_LEN 10 |
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typedef struct ElsDecCtx { |
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const uint8_t *in_buf; |
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unsigned x; |
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size_t data_size; |
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int j, t, diff, err; |
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} ElsDecCtx; |
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typedef struct ElsRungNode { |
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uint8_t rung; |
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uint16_t next_index; |
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} ElsRungNode; |
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typedef struct ElsUnsignedRung { |
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uint8_t prefix_rung[ELS_EXPGOLOMB_LEN + 1]; |
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ElsRungNode *rem_rung_list; |
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size_t rung_list_size; |
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uint16_t avail_index; |
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} ElsUnsignedRung; |
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void ff_els_decoder_init(ElsDecCtx *ctx, const uint8_t *in, size_t data_size); |
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void ff_els_decoder_uninit(ElsUnsignedRung *rung); |
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int ff_els_decode_bit(ElsDecCtx *ctx, unsigned char *rung); |
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unsigned ff_els_decode_unsigned(ElsDecCtx *ctx, ElsUnsignedRung *ur); |
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#endif /* AVCODEC_ELSDEC_H */
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