【VC开源代码栏目提醒】:网学会员为广大网友收集整理了,decQM.cpp,希望对大家有所帮助!
/* $Id: decQM.cpp,v 1.2 2001/04/19 18:32:10 wmay Exp $ */
/****************************************************************************/
/* 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 (iraj@sarnoff.com) */
/* Hung-Ju Lee (hjlee@sarnoff.com) */
/* Paul Hatrack (hatrack@sarnoff.com) */
/* Shipeng Li (shipeng@sarnoff.com) */
/* Bing-Bing Chai (bchai@sarnoff.com) */
/* B.S. Srinivas (bsrinivas@sarnoff.com) */
/* */
/* Bi-level is provided by Texas Instruments */
/* Jie Liang (liang@ti.com) */
/* */
/* Shape Coding is provided by OKI Electric Industry Co., Ltd. */
/* Zhixiong Wu (sgo@hlabs.oki.co.jp) */
/* Yoshihiro Ueda (yueda@hlabs.oki.co.jp) */
/* Toshifumi Kanamaru (kanamaru@hlabs.oki.co.jp) */
/* */
/* OKI, Sharp, Sarnoff, TI and Microsoft contributed to bitstream */
/* exchange and bug fixing. */
/* */
/* */
/* 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 */
/****************************************************************************/
/************************************************************/
/* Sarnoff Very Low Bit Rate Still Image Coder */
/* Copyright 1995, 1996, 1997, 1998 Sarnoff Corporation */
/************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "dataStruct.hpp"
#include "globals.hpp"
#include "states.hpp"
#include "quant.hpp"
#include "QMUtils.hpp"
#include "QM.hpp"
#include "errorHandler.hpp"
/*
Function Name
-------------
static Void iQuantizeCoeff(Int x, Int y)
Arguments
---------
Int x, Int y - Index of wavelet coefficient (row, col) to quantize.
Description
-----------
Quantize the coefficent at (x,y). Also get maximum number of residual
levels for arithmetic coding in SE module.
coeffinfo Updates:
1. quantized_value
2. qState
Functions Called
----------------
none
Return Value
------------
none
Source File
-----------
decQM.c
*/
Void CVTCDecoder::iQuantizeCoeff(Int x, Int y, Int c)
{
Int dumQ=0;
/* assign new quantization value - update quant state */
if (mzte_codec.m_iQuantType == MULTIPLE_Q)
COEFF_RECVAL(x,y,c) =
invQuantSingleStage(COEFF_VAL(x,y,c), USER_Q(c), &COEFF_QSTATE(x,y,c),
&prevQList2[c][coordToSpatialLev(x,y,c)], 0);
else if (mzte_codec.m_iQuantType == SINGLE_Q)
COEFF_RECVAL(x,y,c) =
invQuantSingleStage(COEFF_VAL(x,y,c), USER_Q(c), &COEFF_QSTATE(x,y,c),
&dumQ, 0);
}
/*
Function Name
-------------
static Void iQuantizeCoeffs(Int x, Int y)
Arguments
---------
Int x, Int y - Index of wavelet coefficient (row, col) to mark.
Description
-----------
Inverse quantize coefficient at (x,y) and all of it's descendents.
Uses recursion to accomplish this.
Functions Called
----------------
findChild
iQuantizeCoeffs (recursive call)
iQuantizeCoeff
Return Value
------------
none.
Source File
-----------
decQM.c
*/
Void CVTCDecoder::iQuantizeCoeffs(Int x, Int y, Int c)
{
Int i;
Int xc[4], yc[4]; /* coords of children */
Int nc; /* number of children */
/* Are we at a leaf? */
if ((nc = findChild(x, y, xc, yc, c)) > 0)
{
/* No - mark descendents in all branches */
for (i = 0; i < nc; ++i)
iQuantizeCoeffs(xc[i], yc[i], c);
}
/* inverse quantize the current coefficent */
iQuantizeCoeff(x,y, c);
}
/*
Function Name
-------------
Int decIQuantizeDC()
Arguments
---------
none
Description
-----------
Inverse quantize all DC coefficients.
Functions Called
----------------
invQuantSingleStage
Return Value
------------
0, if everything's ok. <0, if error.
Source File
-----------
decQM.c
*/
Int CVTCDecoder::decIQuantizeDC(Int c)
{
Int err;
Int x, y;
err=0;
/* loop through DC */
noteDetail("Inverse Quantizing DC band....");
for (x = 0; x < mzte_codec.m_iDCWidth; ++x)
for (y = 0; y < mzte_codec.m_iDCHeight; ++y)
{
/* assign new quantization value */
COEFF_RECVAL(x,y,c) = COEFF_VAL(x,y,c) * mzte_codec.m_iQDC[c];
}
noteDetail("Completed inverse Quantizing DC bands.");
return err;
}
/*
Function Name
-------------
Int decIQuantizeAC()
Arguments
---------
none
Description
-----------
Inverse quantize all AC coefficients.
Functions Called
----------------
iQuantizeCoeffs
Return Value
------------
0, if everything's ok. <0, if error.
Source File
-----------
decQM.c
*/
Int CVTCDecoder::decIQuantizeAC(Int c)
{
Int err;
Int x, y;
Int nc;
Int xc[3], yc[3];
err=0;
/* loop through DC */
noteDetail("Inverse quantizing AC bands....");
for (x = 0; x < mzte_codec.m_iDCWidth; ++x)
for (y = 0; y < mzte_codec.m_iDCHeight; ++y)
{
if ((nc = findChild(x, y, xc, yc,c)) != 3)
{
noteError("DC band coefficient has %d children instead of 3.", nc);
exit(-1);
}
iQuantizeCoeffs(xc[0], yc[0],c);
iQuantizeCoeffs(xc[1], yc[1],c);
iQuantizeCoeffs(xc[2], yc[2],c);
}
noteDetail("Completed inverse quantizing of AC bands.");
return err;
}
/***************************************
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