////////////////////////////////////////////////////////////////////////////
//
//
//    Project     : VideoNet version 1.1.
//    Description : Peer to Peer Video Conferencing over the LAN.
//	  Author      :	Nagareshwar Y Talekar ( nsry2002@yahoo.co.in)
//    Date        : 15-6-2004.
//
//    I have converted origional fast h.263 encoder library from C to C++ 
//	  so that it can be integrated into any windows application easily.
//	  I have removed some of unnecessary codes/files from the
//	  fast h263 library.Also moved definitions and declarations
//	  in their proper .h and .cpp files.
//
//    File description : 
//    Name    : quant.cpp
//
//
/////////////////////////////////////////////////////////////////////////////

/************************************************* * libr263: fast H.263 encoder library * * Copyright (C) 1996, Roalt Aalmoes, Twente University * SPA multimedia group * * Based on Telenor TMN 1.6 encoder (Copyright (C) 1995, Telenor R&D) * created by Karl Lillevold  * * Author encoder: Roalt Aalmoes, <aalmoes@huygens.nl> *  * Date: 31-07-96 **************************************************/
#include "stdafx.h"#include "quant.h"/* For q=8, a "speedy" version is integrated */int QuantAndFindCBP(int *coeff, int *qcoeff, int QP, int Mode, int CBP_Mask){  int i;  int level;  int tempje;  int CBP = 0;  if (Mode == MODE_INTRA) { /* Intra */    qcoeff[0] = mmax(1,mmin(254,coeff[0] >> 3)); /* was: /8 */    if(QP == 8) {      for(i = 1; i < 64; i++) {	level = (abs(coeff[i])) >> 4;	qcoeff[i] = mmin(127, mmax(-127,sign(coeff[i]) * level));	if(qcoeff[i])	  CBP = CBP_Mask;      }    } else {			/* QP != 8 */      for(i = 1; i < 64; i++) {	level = (abs(coeff[i])) / (2*QP);	qcoeff[i] =  mmin(127,mmax(-127,sign(coeff[i]) * level));	if(qcoeff[i])	  CBP = CBP_Mask;      }    }	/* End QP == 8 */  }  else { /* non Intra */    if(QP == 8) {      for(i = 0; i < 64; i++) {	tempje = abs(coeff[i]) - 4;	if(tempje < 0) {	  *(qcoeff++) = 0;	} else {	  level = tempje >> 4; /* Note 2*QP == 2*8 = 2^4 == ">>4" */	  if((*(qcoeff++) = mmin(127,mmax(-127,(sign(coeff[i]) > 0) ?					  level :					  -level))) != 0)	    CBP = CBP_Mask;	}      }          } else {			/* QP != 8 */            for (i = 0; i < 64; i++) {	level = (abs(coeff[i])-QP/2)  / (2*QP);	if((*(qcoeff++) = mmin(127,mmax(-127,sign(coeff[i]) * level)))!= 0)	  CBP = CBP_Mask;      }          } /* End QP == 8 */      }    return CBP;}void Dequant(int *qcoeff, int *rcoeff, int QP, int Mode){  int i;    if (QP) {    for (i = 0; i < 64; i++) {      if (qcoeff[i]) {	if ((QP % 2) == 1)	  rcoeff[i] = QP * (2*abs(qcoeff[i]) + 1);	else	  rcoeff[i] = QP * (2*abs(qcoeff[i]) + 1) - 1;	rcoeff[i] = sign(qcoeff[i]) * rcoeff[i];      }      else	rcoeff[i] = 0;    }    if (Mode == MODE_INTRA) { /* Intra */      rcoeff[0] = qcoeff[0]*8;    }  }  else {    /* No quantizing at all */    for (i = 0; i < 64; i++) {      rcoeff[i] = qcoeff[i];    }  }  return;}