bitstream.h

nds上大名鼎鼎的DSOrganize 2.8最新源代码。很值得研究。

/* ***** BEGIN LICENSE BLOCK *****  
 * Source last modified: $Id: bitstream.h,v 1.1.2.1 2005/02/26 02:05:12 jrecker Exp $ 
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/**************************************************************************************
 * Fixed-point HE-AAC decoder
 * Jon Recker ([e-mail])
 * February 2005
 *
 * bitstream.h - definitions of bitstream handling functions
 **************************************************************************************/

#ifndef _BITSTREAM_H
#define _BITSTREAM_H

#include "aaccommon.h"

/* additional external symbols to name-mangle for static linking */
#define SetBitstreamPointer				STATNAME(SetBitstreamPointer)
#define GetBits							STATNAME(GetBits)
#define GetBitsNoAdvance				STATNAME(GetBitsNoAdvance)
#define AdvanceBitstream				STATNAME(AdvanceBitstream)
#define CalcBitsUsed					STATNAME(CalcBitsUsed)
#define ByteAlignBitstream				STATNAME(ByteAlignBitstream)

typedef struct _BitStreamInfo {
	unsigned char *bytePtr;
	unsigned int iCache;
	int cachedBits;
	int nBytes;
} BitStreamInfo;

/* bitstream.c */
void SetBitstreamPointer(BitStreamInfo *bsi, int nBytes, unsigned char *buf);
unsigned int GetBits(BitStreamInfo *bsi, int nBits);
unsigned int GetBitsNoAdvance(BitStreamInfo *bsi, int nBits);
void AdvanceBitstream(BitStreamInfo *bsi, int nBits);
int CalcBitsUsed(BitStreamInfo *bsi, unsigned char *startBuf, int startOffset);
void ByteAlignBitstream(BitStreamInfo *bsi);

#endif	/* _BITSTREAM_H */