crc.h 1.62 KB
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/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * 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
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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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#ifndef FFMPEG_CRC_H
#define FFMPEG_CRC_H
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#include <stdint.h>
#include <sys/types.h>

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typedef uint32_t AVCRC;

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#define AV_CRC_8_ATM      0x07
#define AV_CRC_16         0x8005
#define AV_CRC_16_CCITT   0x1021
#define AV_CRC_32_IEEE    0x04C11DB7L
//! reversed bitorder version of AV_CRC_32_IEEE
#define AV_CRC_32_IEEE_LE 0xEDB88320L

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#if LIBAVUTIL_VERSION_INT  < (50<<16)
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extern AVCRC *av_crcEDB88320;
extern AVCRC *av_crc04C11DB7;
extern AVCRC *av_crc8005    ;
extern AVCRC *av_crc07      ;
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#else
extern AVCRC av_crcEDB88320[];
extern AVCRC av_crc04C11DB7[];
extern AVCRC av_crc8005    [];
extern AVCRC av_crc07      [];
#endif
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int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length);

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#endif /* FFMPEG_CRC_H */
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