crc.h 1.44 KB
Newer Older
1 2 3
/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
4 5 6
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
7 8
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12 13 14 15 16
 * 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
17
 * License along with FFmpeg; if not, write to the Free Software
18 19 20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

21 22
#ifndef AVUTIL_CRC_H
#define AVUTIL_CRC_H
23

24
#include <stdint.h>
25
#include <stddef.h>
26
#include "attributes.h"
27

28 29
typedef uint32_t AVCRC;

Aurelien Jacobs's avatar
Aurelien Jacobs committed
30 31 32 33 34 35
typedef enum {
    AV_CRC_8_ATM,
    AV_CRC_16_ANSI,
    AV_CRC_16_CCITT,
    AV_CRC_32_IEEE,
    AV_CRC_32_IEEE_LE,  /*< reversed bitorder version of AV_CRC_32_IEEE */
36
    AV_CRC_MAX,         /*< Not part of public API! Do not use outside libavutil. */
Aurelien Jacobs's avatar
Aurelien Jacobs committed
37
}AVCRCId;
38 39

int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size);
Aurelien Jacobs's avatar
Aurelien Jacobs committed
40
const AVCRC *av_crc_get_table(AVCRCId crc_id);
41
uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length) av_pure;
42

43
#endif /* AVUTIL_CRC_H */
44