bitstrm.h

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/*************************************************************************

This software module was originally developed by 

	Ming-Chieh Lee ([e-mail]), Microsoft Corporation
	Wei-ge Chen ([e-mail]), Microsoft Corporation
	Bruce Lin ([e-mail]), Microsoft Corporation
	Chuang Gu ([e-mail]), Microsoft Corporation
	(date: March, 1996)

and also edited by
	Yoshihiro Kikuchi (TOSHIBA CORPORATION)
	Takeshi Nagai (TOSHIBA CORPORATION)
	Toshiaki Watanabe (TOSHIBA CORPORATION)
	Noboru Yamaguchi (TOSHIBA CORPORATION)

in the course of development of the MPEG-4 Video (ISO/IEC 14496-2). 
This software module is an implementation of a part of one or more MPEG-4 Video tools 
as specified by the MPEG-4 Video. 
ISO/IEC gives users of the MPEG-4 Video free license to this software module or modifications 
thereof for use in hardware or software products claiming conformance to the MPEG-4 Video. 
Those intending to use this software module in hardware or software products are advised that its use may infringe existing patents. 
The original developer of this software module and his/her company, 
the subsequent editors and their companies, 
and ISO/IEC have no liability for use of this software module or modifications thereof in an implementation. 
Copyright is not released for non MPEG-4 Video conforming products. 
Microsoft retains full right to use the code for his/her own purpose, 
assign or donate the code to a third party and to inhibit third parties from using the code for non <MPEG standard> conforming products. 
This copyright notice must be included in all copies or derivative works. 

Copyright (c) 1996, 1997.

Module Name:
	
	bitstrm.h

Abstract:

	Classes for bitstream I/O.

Revision History:

*************************************************************************/

#ifndef _BITSTREAM_H_
#define _BITSTREAM_H_

/************************** Fast Bitstream routines ***************************/
#define _BSFAST_DECL  unsigned long _cbits; unsigned long _bitsused=0;
#define _BSFAST_INIT()  _BSFastPreload()
#define _BSFAST_DONE() _BSFastFlushBits(_bitsused); _bitsused=0;

#define _BSFastPreload() _BSFastFlushBits(_bitsused); _cbits = _BSFastPeekMaxBits(); _bitsused=0;
#if MIN_BITS_PREHUFF>0
#define _BSFastCheckedPreload() if (_bitsused>MIN_BITS_PREHUFF) { _BSFastFlushBits(_bitsused); _cbits = _BSFastPeekMaxBits(); _bitsused=0; }
#else
#define _BSFastCheckedPreload  _BSFastPreload
#endif
#define _BSFastSkipBits(_count) _cbits<<=_count; _bitsused+=_count
#define _BSFastPeekBits(_count) (_cbits>>(32-_count))
#define _BSFastGetBits(_count) (_cbits>>(32-(_count))); _cbits<<=(_count); _bitsused+=(_count)
#define _BSFastGetBits2(_cbits_,_count,_bitsused_,_outbits_) { (_outbits_)=((_cbits_)>>(32-(_count))); (_cbits_)<<=(_count); (_bitsused_)+=(_count); }
#define _BSFastFlushBits(_count) getBits(_count);
#define _BSFastPeekMaxBits()   (peekBits( 24)<<8)
#define _BSFastCurrentBits() _cbits

#ifdef FAST_LUT_DECODE
/* fast LUT decoder */
typedef union {
	int lut_entry;
	struct { 
		short sym;
		short len;
	} ;
} sym_tab;
#endif


#endif