vtc_shape_shapeenhcommon.cpp

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/****************************************************************************/
/*   MPEG4 Visual Texture Coding (VTC) Mode Software                        */
/*                                                                          */
/*   This software was jointly developed by the following participants:     */
/*                                                                          */
/*   Single-quant,  multi-quant and flow control                            */
/*   are provided by  Sarnoff Corporation                                   */
/*     Iraj Sodagar   ([e-mail])                                    */
/*     Hung-Ju Lee    ([e-mail])                                   */
/*     Paul Hatrack   ([e-mail])                                 */
/*     Shipeng Li     ([e-mail])                                 */
/*     Bing-Bing Chai ([e-mail])                                   */
/*     B.S. Srinivas  ([e-mail])                               */
/*                                                                          */
/*   Bi-level is provided by Texas Instruments                              */
/*     Jie Liang      ([e-mail])                                        */
/*                                                                          */
/*   Shape Coding is provided by  OKI Electric Industry Co., Ltd.           */
/*     Zhixiong Wu    ([e-mail])                                 */
/*     Yoshihiro Ueda ([e-mail])                               */
/*     Toshifumi Kanamaru ([e-mail])                        */
/*                                                                          */
/*   OKI, Sharp, Sarnoff, TI and Microsoft contributed to bitstream         */
/*   exchange and bug fixing.                                               */
/*                                                                          */
/*   Scalable Shape Coding was provided by:                                 */
/*         Shipeng Li (Sarnoff Corporation),                                */
/*         Dae-Sung Cho (Samsung AIT),					    */
/*         Se Hoon Son (Samsung AIT)	                                    */
/* In the course of development of the MPEG-4 standard, this software       */
/* module is an implementation of a part of one or more MPEG-4 tools as     */
/* specified by the MPEG-4 standard.                                        */
/*                                                                          */
/* The copyright of this software belongs to ISO/IEC. ISO/IEC gives use     */
/* of the MPEG-4 standard free license to use this  software module or      */
/* modifications thereof for hardware or software products claiming         */
/* conformance to the MPEG-4 standard.                                      */
/*                                                                          */
/* Those intending to use this software module in hardware or software      */
/* products are advised that use may infringe existing  patents. The        */
/* original developers of this software module and their companies, the     */
/* subsequent editors and their companies, and ISO/IEC have no liability    */
/* and ISO/IEC have no liability for use of this software module or         */
/* modification thereof in an implementation.                               */
/*                                                                          */
/* Permission is granted to MPEG members to use, copy, modify,              */
/* and distribute the software modules ( or portions thereof )              */
/* for standardization activity within ISO/IEC JTC1/SC29/WG11.              */
/*                                                                          */
/* Copyright 1995, 1996, 1997, 1998 ISO/IEC                                 */
/****************************************************************************/
/************************************************************************/
/*                                               			*/
/* This software module was originally developed by              	*/
/*                                                               	*/
/* Dae-Sung Cho (Samsung AIT),						*/
/* Se Hoon Son (Samsung AIT)						*/
/*                                                               	*/
/* and edited by					              	*/
/* Dae-Sung Cho (Samsung AIT)						*/
/*                                                               	*/
/* 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 14496-2). 					*/
/*									*/
/* ISO/IEC gives users of the MPEG-4 Video(ISO/IEC 14496-2)   	 	*/
/* free license to this software module or modifications thereof 	*/
/* for use in hardware or software products claiming conformance 	*/
/* to the MPEG-4 Video(ISO/IEC 14496-2). 				*/
/*									*/
/* 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(ISO/IEC 14496-2) conforming products. 			*/
/*									*/
/* Samsung AIT (SAIT) retain full right to use the code for 		*/
/* their own purposes, assign or donate the code to a third party 	*/
/* and to inhibit third parties from using the code for non		*/
/* MPEG-4 Video(ISO/IEC 14496-2) conforming products. 			*/
/*									*/
/* This copyright notice must be included in all copies or 		*/
/* derivative works.                             			*/
/* Copyright (c) 1997, 1998                                            	*/
/*                                                               	*/
/************************************************************************/


/***********************************************************HeaderBegin*******
 *                                                                         
 * File:	ShapeEnhCommon.c
 *
 * Author:	Dae-Sung Cho (Samsung AIT)
 * Created:	09-Feb-98
 * Modified by: Shipeng Li (Sarnoff Corporation), Dec 2, 1998.
 * Description: Contains functions used to implement scan interleaving
 *                               coding of spatial scalable binary alpha blocks.
 *
 *
 *                                 
 ***********************************************************HeaderEnd*********/

#include <stdio.h>
//#include <malloc.h>
#include <math.h>

#include "dataStruct.hpp"
#include "ShapeEnhDef.hpp"
//#include "ShapeEnhCommon.h"
                   
Int CVTCCommon::
GetContextEnhBAB_XOR(UChar *curr_bab_data,
		Int x2, 
		Int y2,
		Int width2,
		Int pixel_type)	/* pixel type : 0-P1, 1-P2/P3 */
{
   Int		t=0;
   UChar	*p;

   if(pixel_type==0)	/* P1 pixel */
   {
	p=curr_bab_data + (y2-2) * width2 + x2-1;

	t <<= 1; t |= *p; p++;			/* c6 */
	t <<= 1; t |= *p; p++;			/* c5 */
	t <<= 1; t |= *p; p+=((width2<<1)-2);	/* c4 */  
	t <<= 1; t |= *p; p+=2;			/* c3 */
	t <<= 1; t |= *p; p+=((width2<<1)-2);	/* c2 */
	t <<= 1; t |= *p; p+=2;			/* c1 */
	t <<= 1; t |= *p;			/* c0 */
   } 
   else 		/* P2/P3 band */
   {
	p=curr_bab_data + (y2-1) * width2 + x2-1;

	t <<= 1; t |= *p; p++;			/* c6 */
	t <<= 1; t |= *p; p++;			/* c5 */
	t <<= 1; t |= *p; p+=(width2-2);	/* c4 */  
	t <<= 1; t |= *p; p+=width2;		/* c3 */
	t <<= 1; t |= *p; p++;			/* c2 */ 
	t <<= 1; t |= *p; p++;			/* c1 */ 
	t <<= 1; t |= *p;			/* c0 */
   } 
   return t;
}

Int CVTCCommon::
GetContextEnhBAB_FULL(UChar *lower_bab_data,
		UChar *curr_bab_data,
		Int x2, 
		Int y2,
		Int width,
		Int width2)
{
   Int		t=0;
   Int		x = x2 >> 1, 
		y = y2 >> 1;
   UChar	*p, *q;

   p = lower_bab_data + y*width + x;
   q = curr_bab_data + (y2-1) * width2 + (x2-1);

   t <<= 1; t |= *p; p++;			/* c7 */
   t <<= 1; t |= *p; p+= width-1;		/* c6 */
   t <<= 1; t |= *p; p++;			/* c5 */
   t <<= 1; t |= *p; 				/* c4 */

   t <<= 1; t |= *q; q++;			/* c3 */
   t <<= 1; t |= *q; q++;			/* c2 */
   t <<= 1; t |= *q; q+=(width2-2);		/* c1 */
   t <<= 1; t |= *q; 				/* c0 */

   return t;
}

// SAIT_PDAM BEGIN - ADDED by Dae-Sung Cho (Samsung AIT) 
Int CVTCCommon::DecideScanOrder(UChar *bordered_lower_bab, Int mbsize)
{
        Int scan_order;
        Int border = BORDER;
        Int bsize = mbsize >> 1;
        Int bsize_ext = bsize+(border<<1);
        Int i,j;
        Int num_right=0, num_bottom=0;

        UChar   *lower_bab_data;

        lower_bab_data = bordered_lower_bab + border * bsize_ext + border;

        for(j=0;j<bsize;j++){
			for(i=0;i<bsize;i++){
				if( *(lower_bab_data+j*bsize_ext + i) != *(lower_bab_data+j*bsize_ext + i+1))
                                num_right++;
                
				if( *(lower_bab_data+j*bsize_ext + i) != *(lower_bab_data+(j+1)*bsize_ext + i))
                                num_bottom++;
			}
        }

        if(num_bottom <= num_right)     scan_order = 0;
        else                            scan_order = 1;

        return(scan_order);
}
// SAIT_PDAM END - ADDED by Dae-Sung Cho (Samsung AIT) 

Void  CVTCCommon::      
AddBorderToBABs(UChar *LowShape, 
		UChar *HalfShape,
		UChar *CurShape,
		UChar *lower_bab, 
		UChar *half_bab,
		UChar *curr_bab,
		UChar *bordered_lower_bab, 
		UChar *bordered_half_bab,
		UChar *bordered_curr_bab,
		Int object_width, 	/* object_width in the current layer */
		Int object_height,	/* object_height in the current layer */