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author | Michael Niedermayer <michaelni@gmx.at> | 2015-07-01 03:18:30 +0200 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2015-07-01 03:18:30 +0200 |
commit | 68939f7682de3e87251c6e08470d5779804ddd6d (patch) | |
tree | 6eba76563947a5802befcf9effc39ee7638343ba /libavcodec/elsdec.h | |
parent | 3974889614e04f700637b564df737c180d8583ea (diff) | |
parent | 08c2d8f0aa679c2f060721d1d0d4f33d2ae32368 (diff) | |
download | ffmpeg-68939f7682de3e87251c6e08470d5779804ddd6d.tar.gz |
Merge commit '08c2d8f0aa679c2f060721d1d0d4f33d2ae32368'
* commit '08c2d8f0aa679c2f060721d1d0d4f33d2ae32368':
Go2Meeting decoder
Conflicts:
Changelog
libavcodec/g2meet.c
libavcodec/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/elsdec.h')
-rw-r--r-- | libavcodec/elsdec.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/libavcodec/elsdec.h b/libavcodec/elsdec.h new file mode 100644 index 0000000000..139a24ab8b --- /dev/null +++ b/libavcodec/elsdec.h @@ -0,0 +1,60 @@ +/* + * 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 */ |