vopsedec.hpp

此源码是在VC平台下,实现MPEG4编解码的源码

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

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

and also edited by
	Dick van Smirren ([e-mail]), KPN Research
	Cor Quist ([e-mail]), KPN Research
	(date: July, 1998)

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:

	vopSeDec.hpp

Abstract:

	Decoder for one Video Object.

Revision History:

	09-30-97: merge error resilient changes from Toshiba by [e-mail]
	11-30-97: added Spatial tools by Takefumi Nagumo([e-mail]) SONY corporation
	12-20-97: Interlaced tools added by NextLevel Systems
        X. Chen ([e-mail]), B. Eifrig ([e-mail])

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

#ifndef __VOPSEDEC_HPP_ 
#define __VOPSEDEC_HPP_

class CVideoObject;
class ifstream;
class strstreambuf;
class CInBitStream;
class CEntropyDecoderSet;
class CEntropyDecoder;
class CVOPU8YUVBA;
class CEnhcBufferDecoder;

Class CVideoObjectDecoder : public CVideoObject
{
	friend class CVideoObjectDecoderTPS; ///// 97/12/22
	friend class CEnhcBufferDecoder;
public:
	// Constructors
	~CVideoObjectDecoder ();
	CVideoObjectDecoder () {};
	CVideoObjectDecoder ( 
		const Char* pchStrFile, // bitstream file
		Int iDisplayWidth, Int iDisplayHeight,
		Bool *pbSpatialScalability = NULL,
		Bool *p_short_video_header=FALSE,
		strstreambuf* pistrm = NULL
	);
        CVideoObjectDecoder (	// for back/forward shape
		int iDisplayWidth, int iDisplayHeight
	);

	// Operations
	Int decode (const CVOPU8YUVBA* pvopcBVOPQuant = NULL, strstreambuf* pistrm = NULL);
	Int ReadNextVopPredType ();  //for Spatial Scalable Coding
	Int h263_decode(); // [FDS]

	Void decodeInitSprite ();
	Void decodeSpritePieces ();
	Int decodeOneSpritePiece ();
	CRct decodeVOSHead ();
	SptXmitMode m_oldSptXmitMode ;

///////////////// implementation /////////////////
///// 97/12/22 start
public:
	CVideoObjectDecoder* rgpbfShape [2]; // 0 : backward, 1: forward
///// 97/12/22 end

// Added by KPN for short headers
void video_plane_with_short_header();
void gob_layer();
void decodeShortHeaderIntraMBDC(Int *rgiCoefQ);
//Added by KPN for short headers - END


//protected:
public:
	own ifstream* m_pistrm;
	own CInBitStream* m_pbitstrmIn;		//bitstream
	own CEntropyDecoderSet* m_pentrdecSet;	//huffman decoder set
							  //used for video packet header decoding by Toshiba
							  //they are basically cached values of not update after the header decoding
	Time m_tOldModuloBaseDisp;			  //of the most recently displayed I/Pvop
	Time m_tOldModuloBaseDecd;			  //of the most recently decoded I/Pvop
	// buffer data
	CVOPU8YUVBA* m_pvopcRightMB;
	PixelC *m_ppxlcRightMBBY, *m_ppxlcRightMBBUV;

	// buffers for temporal scalability	Added by Sharp(1998-02-10)
	CEnhcBufferDecoder* m_pBuffP1;
	CEnhcBufferDecoder* m_pBuffP2;
	CEnhcBufferDecoder* m_pBuffB1;
	CEnhcBufferDecoder* m_pBuffB2;
	CEnhcBufferDecoder* m_pBuffE;
	int m_coded;
	// buffers for temporal scalability	End	 Sharp(1998-02-10)

	// Added for short headers by KPN (1998-02-07, DS)
	Bool short_video_header;
	UInt uiPei; // [FDS]
	UInt uiGobNumber;
	UInt uiNumGobsInVop;
	UInt uiNumMacroblocksInGob;
	UInt uiGobHeaderEmpty;

	// Added for short headers by KPN - END
	int m_iClockRateScale; // added by Sharp (98/6/26)

 	//	Added for error resilience mode By Toshiba(1998-1-16:DP+RVLC)
 	Int* m_piMCBPC;
 	Int* m_piIntraDC;
 	//	End Toshiba(1998-1-16:DP+RVLC)

	// error handling
	Void errorInBitstream (Char* rgchErorrMsg);

	Int findStartCode();

	// VO and VOL routines
	Void decodeVOHead ();
	Void decodeVOLHead ();

	// VOP routines
	Bool decodeVOPHead ();
	Void decodeVOP ();
	Void decodeIVOP ();
	Void decodePVOP ();
	Void decodeBVOP ();
	Void decodeIVOP_WithShape ();
	Void decodePVOP_WithShape ();
	Void decodeBVOP_WithShape ();
//	Void computeMVInfo ();
 	//	Added for error resilience mode By Toshiba(1998-1-16:DP+RVLC)
 	Void decodeIVOP_DataPartitioning ();
 	Void decodePVOP_DataPartitioning ();
	Void decodeIVOP_WithShape_DataPartitioning ();
	Void decodePVOP_WithShape_DataPartitioning ();
 	//	End Toshiba(1998-1-16:DP+RVLC)

	// MB routines	: texture and overhead
	// I-VOP
	Void decodeMBTextureHeadOfIVOP (CMBMode* pmbmd, Int& iCurrQP,
		Bool &bUseNewQPForVlcThr);
	Void decodeTextureIntraMB (CMBMode* pmbmd, CoordI iMBX, CoordI iMBY, 
			PixelC* ppxlcCurrFrmQY, PixelC* ppxlcCurrFrmQU, PixelC* ppxlcCurrFrmQV);
	Void decodeMBAlphaHeadOfIVOP (CMBMode* pmbmd, Int iCurrQP, Int iCurrQPA, Int iVopQP, Int iVopQPA);
	Void decodeAlphaIntraMB (CMBMode* pmbmd, Int iMBX, Int iMBY, PixelC* ppxlcRefMBA);	
	
	// P-VOP
	Void decodeMBTextureHeadOfPVOP (CMBMode* pmbmd, Int& iCurrQP,
		Bool &bUseNewQPForVlcThr);
	Void decodeMBAlphaHeadOfPVOP (CMBMode* pmbmd, Int iCurrQP, Int iCurrQPA);
	Void decodeTextureInterMB (CMBMode* pmbmd);
	Void decodeAlphaInterMB (CMBMode* pmbmd, PixelC *ppxlcRefMBA);
	
	// B-VOP
	Void decodeMBTextureHeadOfBVOP (CMBMode* pmbmd, Int& iCurrQP);
	Void decodeMBAlphaHeadOfBVOP (CMBMode* pmbmd, Int iCurrQP, Int iCurrQPA);
	
	Void setCBPYandC (CMBMode* pmbmd, Int iCBPC, Int iCBPY, Int cNonTrnspBlk);