Utils.cpp
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:6k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /* $Id: Utils.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 "dataStruct.hpp"
- #include "globals.hpp"
- #include "Utils.hpp"
- Void CVTCCommon::setSpatialLevelAndDimensions(Int spLayer, Int c)
- {
- mzte_codec.m_iCurSpatialLev=spLayer;
- mzte_codec.m_SPlayer[c].height
- =mzte_codec.m_spaLayerHeight[spLayer][c];
- mzte_codec.m_SPlayer[c].width
- =mzte_codec.m_spaLayerWidth[spLayer][c];
- }
- Void CVTCCommon::updateResidMaxAndAssignSkips(Int c)
- {
- Int rLev;
- Int i;
- Int x, y, spX, spY, spHeight, spWidth;
- // hjlee 0901
- WVTDECOMP_RES_NUMBITPLANES(c)=0;
- for (i = 0; i <= mzte_codec.m_iCurSpatialLev; ++i)
- {
- prevQList2[c][i] = prevQList[c][i];
- if (prevQList[c][i] == 0)
- prevQList[c][i] = USER_Q(c);
- rLev=quantRefLev(USER_Q(c), prevQList[c]+i, scaleLev[c][i]++)-1;
- {
- /* extern Int ceilLog2(Int x); */ /* defined in encQM.c */
- Int v;
- v = ceilLog2(rLev+1);
- if (v > WVTDECOMP_RES_NUMBITPLANES(c))
- WVTDECOMP_RES_NUMBITPLANES(c) = v;
- }
- /*--- Set skip mode all coefficients in spatial level ---*/
- if (i < mzte_codec.m_iCurSpatialLev)
- {
- /* Get spatial level dimensions of i^{th} spatial layer */
- // hjlee 0901
- spHeight = mzte_codec.m_spaLayerHeight[i][c];
- spWidth = mzte_codec.m_spaLayerWidth[i][c];
- if (i==0)
- {
- spY = mzte_codec.m_iDCHeight;
- spX = mzte_codec.m_iDCWidth;
- }
- else
- {
- spY = mzte_codec.m_spaLayerHeight[i-1][c];
- spX = mzte_codec.m_spaLayerWidth[i-1][c];
- }
- /* HL */
- for (y = 0; y < spY; ++y)
- for (x = spX; x < spWidth; ++x)
- {
- if (rLev > 0)
- COEFF_SKIP(x,y,c) = 0;
- else if (COEFF_SKIP(x,y,c)==0)
- COEFF_SKIP(x,y,c)=1;
- }
- /* LH */
- for (y = spY; y < spHeight; ++y)
- for (x = 0; x < spX; ++x)
- {
- if (rLev > 0)
- COEFF_SKIP(x,y,c) = 0;
- else if (COEFF_SKIP(x,y,c)==0)
- COEFF_SKIP(x,y,c)=1;
- }
- /* HH */
- for (y = spY; y < spHeight; ++y)
- for (x = spX; x < spWidth; ++x)
- {
- if (rLev > 0)
- COEFF_SKIP(x,y,c) = 0;
- else if (COEFF_SKIP(x,y,c)==0)
- COEFF_SKIP(x,y,c)=1;
- }
- }
- }
- }
- // hjlee 0901
- Int CVTCCommon::xy2wvtDecompLev(Int x, Int y)
- {
- register Int i;
- for (i=0; i<mzte_codec.m_iWvtDecmpLev; ++i)
- if (x < (mzte_codec.m_iDCWidth<<i) && y < (mzte_codec.m_iDCHeight<<i))
- break;
- return i-1;
- }