#include "jpeg.h"
#include "memory.h"
#include "math.h"
#include "stdio.h"
#include "windows.h"
//macro definition
#define WIDTHBYTES(i) ((i+31)/32*4)
#define PI 3.1415926535
//define return value of function
#define FUNC_OK 0
#define FUNC_MEMORY_ERROR 1
#define FUNC_FILE_ERROR 2
#define FUNC_FORMAT_ERROR 3
//////////////////////////////////////////////////
//Jpeg functions
BOOL LoadJpegFile(char *BmpFileName);
void showerror(int funcret);
int InitTag();
void InitTable();
int Decode();
int DecodeMCUBlock();
int HufBlock(unsigned char dchufindex,unsigned char achufindex);
int DecodeElement();
void IQtIZzMCUComponent(short flag);
void IQtIZzBlock(short *s ,int * d,short flag);
void GetYUV(short flag);
void StoreBuffer();
BYTE ReadByte();
void Initialize_Fast_IDCT();
void Fast_IDCT(int * block);
void idctrow(int * blk);
void idctcol(int * blk);
//////////////////////////////////////////////////
//global variable declaration
BITMAPFILEHEADER bf;
BITMAPINFOHEADER bi;
HBITMAP hBitmap=NULL;
HGLOBAL hImgData=NULL;
DWORD NumColors;
DWORD LineBytes;
DWORD ImgWidth=0 , ImgHeight=0;
unsigned int PcxBytesPerLine;
LPSTR lpPtr;
//////////////////////////////////////////////////
//variables used in jpeg function
short SampRate_Y_H,SampRate_Y_V;
short SampRate_U_H,SampRate_U_V;
short SampRate_V_H,SampRate_V_V;
short H_YtoU,V_YtoU,H_YtoV,V_YtoV;
short Y_in_MCU,U_in_MCU,V_in_MCU;
unsigned char *lpJpegBuf;
unsigned char *lp;
short qt_table[3][64];
short comp_num;
BYTE comp_index[3];
BYTE YDcIndex,YAcIndex,UVDcIndex,UVAcIndex;
BYTE HufTabIndex;
short *YQtTable,*UQtTable,*VQtTable;
BYTE And[9]={0,1,3,7,0xf,0x1f,0x3f,0x7f,0xff};
short code_pos_table[4][16],code_len_table[4][16];
unsigned short code_value_table[4][256];
unsigned short huf_max_value[4][16],huf_min_value[4][16];
short BitPos,CurByte;
short rrun,vvalue;
short MCUBuffer[10*64];
int QtZzMCUBuffer[10*64];
short BlockBuffer[64];
short ycoef,ucoef,vcoef;
BOOL IntervalFlag;
short interval=0;
int Y[4*64],U[4*64],V[4*64];
DWORD sizei,sizej;
short restart;
static long iclip[1024];
static long *iclp;
////////////////////////////////////////////////////////////////
int LoadJpegFile (char *JpegFileName)
{
HFILE hfjpg;
DWORD ImgSize;
DWORD JpegBufSize;
HFILE hfbmp;
HGLOBAL hJpegBuf;
int funcret;
LPBITMAPINFOHEADER lpImgData;
if((hfjpg=_lopen(JpegFileName,OF_READ))==HFILE_ERROR)
{
showerror(FUNC_FILE_ERROR);
return 0;
}
//get jpg file length
JpegBufSize=_llseek(hfjpg,0L,SEEK_END);
//rewind to the beginning of the file
_llseek(hfjpg,0L,SEEK_SET);
if((hJpegBuf=GlobalAlloc(GHND,JpegBufSize))==NULL)
{
_lclose(hfjpg);
showerror(FUNC_MEMORY_ERROR);
return 0;
}
lpJpegBuf=(unsigned char *)GlobalLock(hJpegBuf);
_hread(hfjpg,(unsigned char *)lpJpegBuf,JpegBufSize);
_lclose(hfjpg);
InitTable();
if((funcret=InitTag())!=FUNC_OK)
{
GlobalUnlock(hJpegBuf);
GlobalFree(hJpegBuf);
showerror(funcret);
return 0;
}
//create new bitmapfileheader and bitmapinfoheader
memset((char *)&bf,0,sizeof(BITMAPFILEHEADER));
memset((char *)&bi,0,sizeof(BITMAPINFOHEADER));
bi.biSize=(DWORD)sizeof(BITMAPINFOHEADER);
bi.biWidth=(LONG)(ImgWidth);
bi.biHeight=(LONG)(ImgHeight);
bi.biPlanes=1;
bi.biBitCount=24;
bi.biClrUsed=0;
bi.biClrImportant=0;
bi.biCompression=BI_RGB;
NumColors=0;
LineBytes=(DWORD)WIDTHBYTES(bi.biWidth*bi.biBitCount);
ImgSize=(DWORD)LineBytes*bi.biHeight;
bf.bfType=0x4d42;
bf.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+NumColors*sizeof(RGBQUAD)+ImgSize;
bf.bfOffBits=(DWORD)(NumColors*sizeof(RGBQUAD)+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER));
if((hImgData=GlobalAlloc(GHND,ImgSize))==NULL)
{
GlobalUnlock(hJpegBuf);
GlobalFree(hJpegBuf);
showerror(FUNC_MEMORY_ERROR);
return FALSE;
}
lpImgData=(LPBITMAPINFOHEADER)GlobalLock(hImgData);
lpPtr=(char *)lpImgData;
if((SampRate_Y_H==0)||(SampRate_Y_V==0))
{
GlobalUnlock(hJpegBuf);
GlobalFree(hJpegBuf);
GlobalUnlock(hImgData);
GlobalFree(hImgData);
hImgData=NULL;
showerror(FUNC_FORMAT_ERROR);
return FALSE ;
}
funcret=Decode();
if(funcret==FUNC_OK)
{
hfbmp=_lcreat("test.bmp",0);
_lwrite(hfbmp,(LPSTR)&bf,sizeof(BITMAPFILEHEADER)); // BMP
_lwrite(hfbmp,(LPSTR)&bi,sizeof(BITMAPINFOHEADER)); // BMP
_lwrite(hfbmp,(LPSTR)lpImgData,ImgSize); // BMP
_lclose(hfbmp);
GlobalUnlock(hJpegBuf);
GlobalFree(hJpegBuf);
GlobalUnlock(hImgData);
return TRUE;
}
else
{
GlobalUnlock(hJpegBuf);
GlobalFree(hJpegBuf);
GlobalUnlock(hImgData);
GlobalFree(hImgData);
hImgData=NULL;
showerror(funcret);
return FALSE;
}
}
/////////////////////////////////////////////////
void showerror(int funcret)
{
switch(funcret)
{
case FUNC_MEMORY_ERROR:
printf("Error alloc memory!
");
exit(1);
break;
case FUNC_FILE_ERROR:
printf("File not found!!
");
exit(1);
break;
case FUNC_FORMAT_ERROR:
printf("File format error!
");
exit(1);
break;
}
}
////////////////////////////////////////////////////////////////////////////////
int InitTag()
{
BOOL finish=FALSE;
BYTE id;
short llength;
short i,j,k;
short huftab1,huftab2;
short huftabindex;
BYTE hf_table_index;
BYTE qt_table_index;
BYTE comnum;
unsigned char *lptemp;
short ccount;
lp=lpJpegBuf+2;
while (!finish)
{
id=*(lp+1);
lp+=2;
switch (id)
{
case M_APP0:
llength=MAKEWORD(*(lp+1),*lp);
lp+=llength;
break;
case M_DQT:
llength=MAKEWORD(*(lp+1),*lp);
qt_table_index=(*(lp+2))&0x0f;
lptemp=lp+3;
if(llength<80)
{
for(i=0;i<64;i++)
qt_table[qt_table_index][i]=(short)*(lptemp++);
}
else
{
for(i=0;i<64;i++)
qt_table[qt_table_index][i]=(short)*(lptemp++);
qt_table_index=(*(lptemp++))&0x0f;
for(i=0;i<64;i++)
qt_table[qt_table_index][i]=(short)*(lptemp++);
}
lp+=llength;
break;
case M_SOF0:
llength=MAKEWORD(*(lp+1),*lp);
ImgHeight=MAKEWORD(*(lp+4),*(lp+3));
ImgWidth=MAKEWORD(*(lp+6),*(lp+5));
comp_num=*(lp+7);
if((comp_num!=1)&&(comp_num!=3))
return FUNC_FORMAT_ERROR;
if(comp_num==3)
{
comp_index[0]=*(lp+8);
SampRate_Y_H=(*(lp+9))>>4;
SampRate_Y_V=(*(lp+9))&0x0f;
YQtTable=(short *)qt_table[*(lp+10)];
comp_index[1]=*(lp+11);
SampRate_U_H=(*(lp+12))>>4;
SampRate_U_V=(*(lp+12))&0x0f;
UQtTable=(short *)qt_table[*(lp+13)];
comp_index[2]=*(lp+14);
SampRate_V_H=(*(lp+15))>>4;
SampRate_V_V=(*(lp+15))&0x0f;
VQtTable=(short *)qt_table[*(lp+16)];
}
else
{
comp_index[0]=*(lp+8);
SampRate_Y_H=(*(lp+9))>>4;
SampRate_Y_V=(*(lp+9))&0x0f;
YQtTable=(short *)qt_table[*(lp+10)];
comp_index[1]=*(lp+8);
SampRate_U_H=1;
SampRate_U_V=1;
UQtTable=(short *)qt_table[*(lp+10)];
comp_index[2]=*(lp+8);
SampRate_V_H=1;
SampRate_V_V=1;
VQtTable=(short *)qt_table[*(lp+10)];
}
lp+=llength;
break;
case M_DHT:
llength=MAKEWORD(*(lp+1),*lp);
if (llength<0xd0)
{
huftab1=(short)(*(lp+2))>>4; //huftab1=0,1
huftab2=(short)(*(lp+2))&0x0f; //huftab2=0,1
huftabindex=huftab1*2+huftab2;
lptemp=lp+3;
for (i=0; i<16; i++)
code_len_table[huftabindex][i]=(short)(*(lptemp++));
j=0;
for (i=0; i<16; i++)
if(code_len_table[huftabindex][i]!=0)
{
k=0;
while(k<code_len_table[huftabindex][i])
{
code_value_table[huftabindex][k+j]=(short)(*(lptemp++));
k++;
}
j+=k;
}
i=0;
while (code_len_table[huftabindex][i]==0)
i++;
for (j=0;j<i;j++)
{
huf_min_value[huftabindex][j]=0;
huf_max_value[huftabindex][j]=0;
}
huf_min_value[huftabindex][i]=0;
huf_max_value[huftabindex][i]=code_len_table[huftabindex][i]-1;
for (j=i+1;j<16;j++)
{
huf_min_value[huftabindex][j]=(huf_max_value[huftabindex][j-1]+1)<<1;
huf_max_value[huftabindex][j]=huf_min_value[huftabindex][j]+code_len_table[huftabindex][j]-1;
}
code_pos_table[huftabindex][0]=0;
for (j=1;j<16;j++)
code_pos_table[huftabindex][j]=code_len_table[huftabindex][j-1]+code_pos_table[huftabindex][j-1];
lp+=llength;
} //if
else
{
hf_table_index=*(lp+2);
lp+=2;
while (hf_table_index!=0xff)
{
huftab1=(short)hf_table_index>>4; //huftab1=0,1
huftab2=(short)hf_table_index&0x0f; //huftab2=0,1
huftabindex=huftab1*2+huftab2;
lptemp=lp+1;
ccount=0;
for (i=0; i<16; i++)
{
code_len_table[huftabindex][i]=(short)(*(lptemp++));
ccount+=code_len_table[huftabindex][i];
}
ccount+=17;
j=0;
for (i=0; i<16; i++)
if(code_len_table[huftabindex][i]!=0)
{
k=0;
while(k<code_len_table[huftabindex][i])
{
code_value_table[huftabindex][k+j]=(short)(*(lptemp++));
k++;
}
j+=k;
}
i=0;
while (code_len_table[huftabindex][i]==0)
i++;
for (j=0;j<i;j++)
{
huf_min_value[huftabindex][j]=0;
huf_max_value[huftabindex][j]=0;
}
huf_min_value[huftabindex][i]=0;
huf_max_value[huftabindex][i]=code_len_table[huftabindex][i]-1;
for (j=i+1;j<16;j++)
{
huf_min_value[huftabindex][j]=(huf_max_value[huftabindex][j-1]+1)<<1;
huf_max_value[huftabindex][j]=huf_min_value[huftabindex][j]+code_len_table[huftabindex][j]-1;
}
code_pos_table[huftabindex][0]=0;
for (j=1;j<16;j++)
code_pos_table[huftabindex][j]=code_len_table[huftabindex][j-1]+code_pos_table[huftabindex][j-1];
lp+=ccount;
hf_table_index=*lp;
} //while
} //else
break;
case M_DRI:
llength=MAKEWORD(*(lp+1),*lp);
restart=MAKEWORD(*(lp+3),*(lp+2));
lp+=llength;
break;
case M_SOS:
llength=MAKEWORD(*(lp+1),*lp);
comnum=*(lp+2);
if(comnum!=comp_num)
return FUNC_FORMAT_ERROR;
lptemp=lp+3;
for (i=0;i<comp_num;i++)
{
if(*lptemp==comp_index[0])
{
YDcIndex=(*(lptemp+1))>>4; //Y
YAcIndex=((*(lptemp+1))&0x0f)+2;
}
else{
UVDcIndex=(*(lptemp+1))>>4; //U,V
UVAcIndex=((*(lptemp+1))&0x0f)+2;
}
lptemp+=2;
}
lp+=llength;
finish=TRUE;
break;
case M_EOI:
return FUNC_FORMAT_ERROR;
break;
default:
if ((id&0xf0)!=0xd0)
{
llength=MAKEWORD(*(lp+1),*lp);
lp+=llength;
}
else lp+=2;
break;
} //switch
} //while
return FUNC_OK;
}
/////////////////////////////////////////////////////////////////
void InitTable()
{
short i,j;
sizei=sizej=0;
ImgWidth=ImgHeight=0;
rrun=vvalue=0;
BitPos=0;
CurByte=0;
IntervalFlag=FALSE;
restart=0;
for(i=0;i<3;i++)
for(j=0;j<64;j++)
qt_table[i][j]=0;
comp_num=0;
HufTabIndex=0;
for(i=0;i<3;i++)
comp_index[i]=0;
for(i=0;i<4;i++)
for(j=0;j<16;j++)
{
code_len_table[i][j]=0;
code_pos_table[i][j]=0;
huf_max_value[i][j]=0;
huf_min_value[i][j]=0;
}
for(i=0;i<4;i++)
for(j=0;j<256;j++)
code_value_table[i][j]=0;
for(i=0;i<10*64;i++)
{
MCUBuffer[i]=0;
QtZzMCUBuffer[i]=0;
}
for(i=0;i<4*64;i++)
{
Y[i]=0;
U[i]=0;
V[i]=0;
}
for(i=0;i<64;i++)
BlockBuffer[i]=0;
ycoef=ucoef=vcoef=0;
}
/////////////////////////////////////////////////////////////////////////
int Decode()
{
int funcret;
Y_in_MCU=SampRate_Y_H*SampRate_Y_V;
U_in_MCU=SampRate_U_H*SampRate_U_V;
V_in_MCU=SampRate_V_H*SampRate_V_V;
H_YtoU=SampRate_Y_H/SampRate_U_H;
V_YtoU=SampRate_Y_V/SampRate_U_V;
H_YtoV=SampRate_Y_H/SampRate_V_H;
V_YtoV=SampRate_Y_V/SampRate_V_V;
Initialize_Fast_IDCT();
while((funcret=DecodeMCUBlock())==FUNC_OK)
{
interval++;
if((restart)&&(interval % restart==0))
IntervalFlag=TRUE;
else
IntervalFlag=FALSE;
IQtIZzMCUComponent(0);
IQtIZzMCUComponent(1);
IQtIZzMCUComponent(2);
GetYUV(0);
GetYUV(1);
GetYUV(2);
StoreBuffer();
sizej+=SampRate_Y_H*8;
if(sizej>=ImgWidth)
{
sizej=0;
sizei+=SampRate_Y_V*8;
}
if ((sizej==0)&&(sizei>=ImgHeight))
break;
}
return funcret;
}
/////////////////////////////////////////////////////////////////////////////////////////
void GetYUV(short flag)
{
short H,VV;
short i,j,k,h;
int *buf;
int *pQtZzMCU;
switch(flag)
{
case 0:
H=SampRate_Y_H;
VV=SampRate_Y_V;
buf=Y;
pQtZzMCU=QtZzMCUBuffer;
break;
case 1:
H=SampRate_U_H;
VV=SampRate_U_V;
buf=U;
pQtZzMCU=QtZzMCUBuffer+Y_in_MCU*64;
break;
case 2:
H=SampRate_V_H;
VV=SampRate_V_V;
buf=V;
pQtZzMCU=QtZzMCUBuffer+(Y_in_MCU+U_in_MCU)*64;
break;
}
for (i=0;i<VV;i++)
for(j=0;j<H;j++)
for(k=0;k<8;k++)
for(h=0;h<8;h++)
buf[(i*8+k)*SampRate_Y_H*8+j*8+h]=*pQtZzMCU++;
}
///////////////////////////////////////////////////////////////////////////////
void StoreBuffer()
{
short i,j;
unsigned char *lpbmp;
unsigned char R,G,B;
int y,u,v,rr,gg,bb;
for(i=0;i<SampRate_Y_V*8;i++)
{
if((sizei+i)<ImgHeight)
{
lpbmp=((unsigned char *)lpPtr+(DWORD)(ImgHeight-sizei-i-1)*LineBytes+sizej*3);
for(j=0;j<SampRate_Y_H*8;j++)
{
if((sizej+j)<ImgWidth)
{
y=Y[i*8*SampRate_Y_H+j];
u=U[(i/V_YtoU)*8*SampRate_Y_H+j/H_YtoU];
v=V[(i/V_YtoV)*8*SampRate_Y_H+j/H_YtoV];
rr=((y<<8)+18*u+367*v)>>8;
gg=((y<<8)-159*u-220*v)>>8;
bb=((y<<8)+411*u-29*v)>>8;
R=(unsigned char)rr;
G=(unsigned char)gg;
B=(unsigned char)bb;
if (rr&0xffffff00) if (rr>255) R=255; else if (rr<0) R=0;
if (gg&0xffffff00) if (gg>255) G=255; else if (gg<0) G=0;
if (bb&0xffffff00) if (bb>255) B=255; else if (bb<0) B=0;
*lpbmp++=B;
*lpbmp++=G;
*lpbmp++=R;
}
else break;
}
}
else break;
}
}
///////////////////////////////////////////////////////////////////////////////
int DecodeMCUBlock()
{
short *lpMCUBuffer;
short i,j;
int funcret;
if (IntervalFlag)
{
lp+=2;
ycoef=ucoef=vcoef=0;
BitPos=0;
CurByte=0;
}
switch(comp_num)
{
case 3:
lpMCUBuffer=MCUBuffer;
for (i=0;i<SampRate_Y_H*SampRate_Y_V;i++) //Y
{
funcret=HufBlock(YDcIndex,YAcIndex);
if (funcret!=FUNC_OK)
return funcret;
BlockBuffer[0]=BlockBuffer[0]+ycoef;
ycoef=BlockBuffer[0];
for (j=0;j<64;j++)
*lpMCUBuffer++=BlockBuffer[j];
}
for (i=0;i<SampRate_U_H*SampRate_U_V;i++) //U
{
funcret=HufBlock(UVDcIndex,UVAcIndex);
if (funcret!=FUNC_OK)
return funcret;
BlockBuffer[0]=BlockBuffer[0]+ucoef;
ucoef=BlockBuffer[0];
for (j=0;j<64;j++)
*lpMCUBuffer++=BlockBuffer[j];
}
for (i=0;i<SampRate_V_H*SampRate_V_V;i++) //V
{
funcret=HufBlock(UVDcIndex,UVAcIndex);
if (funcret!=FUNC_OK)
return funcret;
BlockBuffer[0]=BlockBuffer[0]+vcoef;
vcoef=BlockBuffer[0];
for (j=0;j<64;j++)
*lpMCUBuffer++=BlockBuffer[j];
}
break;
case 1:
lpMCUBuffer=MCUBuffer;
funcret=HufBlock(YDcIndex,YAcIndex);
if (funcret!=FUNC_OK)
return funcret;
BlockBuffer[0]=BlockBuffer[0]+ycoef;
ycoef=BlockBuffer[0];
for (j=0;j<64;j++)
*lpMCUBuffer++=BlockBuffer[j];
for (i=0;i<128;i++)
*lpMCUBuffer++=0;
break;
default:
return FUNC_FORMAT_ERROR;
}
return FUNC_OK;
}
//////////////////////////////////////////////////////////////////
int HufBlock(BYTE dchufindex,BYTE achufindex)
{
short count=0;
short i;
int funcret;
//dc
HufTabIndex=dchufindex;
funcret=DecodeElement();
if(funcret!=FUNC_OK)
return funcret;
BlockBuffer[count++]=vvalue;
//ac
HufTabIndex=achufindex;
while (count<64)
{
funcret=DecodeElement();
if(funcret!=FUNC_OK)
return funcret;
if ((rrun==0)&&(vvalue==0))
{
for (i=count;i<64;i++)
BlockBuffer[i]=0;
count=64;
}
else
{
for (i=0;i<rrun;i++)
BlockBuffer[count++]=0;
BlockBuffer[count++]=vvalue;
}
}
return FUNC_OK;
}
//////////////////////////////////////////////////////////////////////////////
int DecodeElement()
{
int thiscode,tempcode;
unsigned short temp,valueex;
short codelen;
BYTE hufexbyte,runsize,tempsize,sign;
BYTE newbyte,lastbyte;
if(BitPos>=1)
{
BitPos--;
thiscode=(BYTE)CurByte>>BitPos;
CurByte=CurByte&And[BitPos];
}
else
{
lastbyte=ReadByte();
BitPos--;
newbyte=CurByte&And[BitPos];
thiscode=lastbyte>>7;
CurByte=newbyte;
}
codelen=1;
while ((thiscode<huf_min_value[HufTabIndex][codelen-1])||
(code_len_table[HufTabIndex][codelen-1]==0)||
(thiscode>huf_max_value[HufTabIndex][codelen-1]))
{
if(BitPos>=1)
{
BitPos--;
tempcode=(BYTE)CurByte>>BitPos;
CurByte=CurByte&And[BitPos];
}
else
{
lastbyte=ReadByte();
BitPos--;
newbyte=CurByte&And[BitPos];
tempcode=(BYTE)lastbyte>>7;
CurByte=newbyte;
}
thiscode=(thiscode<<1)+tempcode;
codelen++;
if(codelen>16)
return FUNC_FORMAT_ERROR;
} //while
temp=thiscode-huf_min_value[HufTabIndex][codelen-1]+code_pos_table[HufTabIndex][codelen-1];
hufexbyte=(BYTE)code_value_table[HufTabIndex][temp];
rrun=(short)(hufexbyte>>4);
runsize=hufexbyte&0x0f;
if(runsize==0)
{
vvalue=0;
return FUNC_OK;
}
tempsize=runsize;
if(BitPos>=runsize)
{
BitPos-=runsize;
valueex=(BYTE)CurByte>>BitPos;
CurByte=CurByte&And[BitPos];
}
else
{
valueex=CurByte;
tempsize-=BitPos;
while(tempsize>8)
{
lastbyte=ReadByte();
valueex=(valueex<<8)+(BYTE)lastbyte;
tempsize-=8;
} //while
lastbyte=ReadByte();
BitPos-=tempsize;
valueex=(valueex<<tempsize)+(lastbyte>>BitPos);
CurByte=lastbyte&And[BitPos];
} //else
sign=valueex>>(runsize-1);
if(sign)
vvalue=valueex;
else
{
valueex=valueex^0xffff;
temp=0xffff<<runsize;
vvalue=-(short)(valueex^temp);
}
return FUNC_OK;
}
/////////////////////////////////////////////////////////////////////////////////////
void IQtIZzMCUComponent(short flag)
{
short H,VV;
short i,j;
int *pQtZzMCUBuffer;
short *pMCUBuffer;
switch(flag)
{
case 0:
H=SampRate_Y_H;
VV=SampRate_Y_V;
pMCUBuffer=MCUBuffer;
pQtZzMCUBuffer=QtZzMCUBuffer;
break;
case 1:
H=SampRate_U_H;
VV=SampRate_U_V;
pMCUBuffer=MCUBuffer+Y_in_MCU*64;
pQtZzMCUBuffer=QtZzMCUBuffer+Y_in_MCU*64;
break;
case 2:
H=SampRate_V_H;
VV=SampRate_V_V;
pMCUBuffer=MCUBuffer+(Y_in_MCU+U_in_MCU)*64;
pQtZzMCUBuffer=QtZzMCUBuffer+(Y_in_MCU+U_in_MCU)*64;
break;
}
for(i=0;i<VV;i++)
for (j=0;j<H;j++)
IQtIZzBlock(pMCUBuffer+(i*H+j)*64,pQtZzMCUBuffer+(i*H+j)*64,flag);
}
//////////////////////////////////////////////////////////////////////////////////////////
void IQtIZzBlock(short *s ,int * d,short flag)
{
short i,j;
short tag;
short *pQt;
int buffer2[8][8];
int *buffer1;
short offset;
switch(flag)
{
case 0:
pQt=YQtTable;
offset=128;
break;
case 1:
pQt=UQtTable;
offset=0;
break;
case 2:
pQt=VQtTable;
offset=0;
break;
}
for(i=0;i<8;i++)
for(j=0;j<8;j++)
{
tag=Zig_Zag[i][j];
buffer2[i][j]=(int)s[tag]*(int)pQt[tag];
}
buffer1=(int *)buffer2;
Fast_IDCT(buffer1);
for(i=0;i<8;i++)
for(j=0;j<8;j++)
d[i*8+j]=buffer2[i][j]+offset;
}
///////////////////////////////////////////////////////////////////////////////
void Fast_IDCT(int * block)
{
short i;
for (i=0; i<8; i++)
idctrow(block+8*i);
for (i=0; i<8; i++)
idctcol(block+i);
}
///////////////////////////////////////////////////////////////////////////////
BYTE ReadByte()
{
BYTE i;
i=*(lp++);
if(i==0xff)
lp++;
BitPos=8;
CurByte=i;
return i;
}
///////////////////////////////////////////////////////////////////////
void Initialize_Fast_IDCT()
{
short i;
iclp = iclip+512;
for (i= -512; i<512; i++)
iclp[i] = (i<-256) ? -256 : ((i>255) ? 255 : i);
}
////////////////////////////////////////////////////////////////////////
void idctrow(int * blk)
{
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
//intcut
if (!((x1 = blk[4]<<11) | (x2 = blk[6]) | (x3 = blk[2]) |
(x4 = blk[1]) | (x5 = blk[7]) | (x6 = blk[5]) | (x7 = blk[3])))
{
blk[0]=blk[1]=blk[2]=blk[3]=blk[4]=blk[5]=blk[6]=blk[7]=blk[0]<<3;
return;
}
x0 = (blk[0]<<11) + 128; // for proper rounding in the fourth stage
//first stage
x8 = W7*(x4+x5);
x4 = x8 + (W1-W7)*x4;
x5 = x8 - (W1+W7)*x5;
x8 = W3*(x6+x7);
x6 = x8 - (W3-W5)*x6;
x7 = x8 - (W3+W5)*x7;
//second stage
x8 = x0 + x1;
x0 -= x1;
x1 = W6*(x3+x2);
x2 = x1 - (W2+W6)*x2;
x3 = x1 + (W2-W6)*x3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
//third stage
x7 = x8 + x3;
x8 -= x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181*(x4+x5)+128)>>8;
x4 = (181*(x4-x5)+128)>>8;
//fourth stage
blk[0] = (x7+x1)>>8;
blk[1] = (x3+x2)>>8;
blk[2] = (x0+x4)>>8;
blk[3] = (x8+x6)>>8;
blk[4] = (x8-x6)>>8;
blk[5] = (x0-x4)>>8;
blk[6] = (x3-x2)>>8;
blk[7] = (x7-x1)>>8;
}
//////////////////////////////////////////////////////////////////////////////
void idctcol(int * blk)
{
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
//intcut
if (!((x1 = (blk[8*4]<<8)) | (x2 = blk[8*6]) | (x3 = blk[8*2]) |
(x4 = blk[8*1]) | (x5 = blk[8*7]) | (x6 = blk[8*5]) | (x7 = blk[8*3])))
{
blk[8*0]=blk[8*1]=blk[8*2]=blk[8*3]=blk[8*4]=blk[8*5]
=blk[8*6]=blk[8*7]=iclp[(blk[8*0]+32)>>6];
return;
}
x0 = (blk[8*0]<<8) + 8192;
//first stage
x8 = W7*(x4+x5) + 4;
x4 = (x8+(W1-W7)*x4)>>3;
x5 = (x8-(W1+W7)*x5)>>3;
x8 = W3*(x6+x7) + 4;
x6 = (x8-(W3-W5)*x6)>>3;
x7 = (x8-(W3+W5)*x7)>>3;
//second stage
x8 = x0 + x1;
x0 -= x1;
x1 = W6*(x3+x2) + 4;
x2 = (x1-(W2+W6)*x2)>>3;
x3 = (x1+(W2-W6)*x3)>>3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
//third stage
x7 = x8 + x3;
x8 -= x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181*(x4+x5)+128)>>8;
x4 = (181*(x4-x5)+128)>>8;
//fourth stage
blk[8*0] = iclp[(x7+x1)>>14];
blk[8*1] = iclp[(x3+x2)>>14];
blk[8*2] = iclp[(x0+x4)>>14];
blk[8*3] = iclp[(x8+x6)>>14];
blk[8*4] = iclp[(x8-x6)>>14];
blk[8*5] = iclp[(x0-x4)>>14];
blk[8*6] = iclp[(x3-x2)>>14];
blk[8*7] = iclp[(x7-x1)>>14];
}
main( )
{
LoadJpegFile("test.jpg");
}