From 08c2d8f0aa679c2f060721d1d0d4f33d2ae32368 Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Fri, 10 Apr 2015 12:14:27 +0200 Subject: Go2Meeting decoder ELS and ePIC decoder courtesy of Maxim Poliakovski, cleanup and integration by Diego Biurrun. Signed-off-by: Diego Biurrun Signed-off-by: Luca Barbato --- libavcodec/elsdec.h | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 libavcodec/elsdec.h (limited to 'libavcodec/elsdec.h') diff --git a/libavcodec/elsdec.h b/libavcodec/elsdec.h new file mode 100644 index 0000000000..515b49aa71 --- /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 Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 +#include + +#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 */ -- cgit v1.2.3