www.pudn.com > ffmpeg-Sdk.rar > crc.h

/* 
 * copyright (c) 2006 Michael Niedermayer  
 * 
 * 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 
 */ 
 
#ifndef FFMPEG_CRC_H 
#define FFMPEG_CRC_H 
 
#include  
#include  
 
typedef uint32_t AVCRC; 
 
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 */ 
    AV_CRC_MAX,         /*< not part of public API! don't use outside lavu */ 
}AVCRCId; 
 
int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size); 
const AVCRC *av_crc_get_table(AVCRCId crc_id); 
uint32_t av_crc(const AVCRC *ctx, uint32_t start_crc, const uint8_t *buffer, size_t length); 
 
#endif /* FFMPEG_CRC_H */