#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#pragma pack(1)
#define M_SOF0 0xc0
#define M_DHT 0xc4
#define M_EOI 0xd9
#define M_SOS 0xda
#define M_DQT 0xdb
#define M_DRI 0xdd
#define M_APP0 0xe0
static int Zig_Zag[8][8] = { { 0, 1, 5, 6, 14, 15, 27, 28 },
{ 2, 4, 7, 13, 16, 26, 29, 42 },
{ 3, 8, 12, 17, 25, 30, 41, 43 },
{ 9, 11, 18, 24, 37, 40, 44, 53 },
{ 10, 19, 23, 32, 39, 45, 52, 54 },
{ 20, 22, 33, 38, 46, 51, 55, 60 },
{ 21, 34, 37, 47, 50, 56, 59, 61 },
{ 35, 36, 48, 49, 57, 58, 62, 63 }
};
#define W1 2841 /* 2048*sqrt(2)*cos(1*pi/16) */
#define W2 2676 /* 2048*sqrt(2)*cos(2*pi/16) */
#define W3 2408 /* 2048*sqrt(2)*cos(3*pi/16) */
#define W5 1609 /* 2048*sqrt(2)*cos(5*pi/16) */
#define W6 1108 /* 2048*sqrt(2)*cos(6*pi/16) */
#define W7 565 /* 2048*sqrt(2)*cos(7*pi/16) */
//*************************************************************************************
typedef char CHAR;
typedef short SHORT;
typedef long LONG;
typedef unsigned long DWORD;
typedef int BOOL;
typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef int HFILE;
typedef CHAR *LPSTR, *PSTR;
#define FALSE 0
#define TRUE 1
typedef struct tagBITMAPINFOHEADER{
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
} BITMAPINFOHEADER, *LPBITMAPINFOHEADER, *PBITMAPINFOHEADER;
typedef struct tagBITMAPFILEHEADER {
WORD bfType;
DWORD bfSize;
WORD bfReserved1;
WORD bfReserved2;
DWORD bfOffBits;
} BITMAPFILEHEADER, *LPBITMAPFILEHEADER, *PBITMAPFILEHEADER;
/* constants for the biCompression field */
#define BI_RGB 0L
#define BI_RLE8 1L
#define BI_RLE4 2L
#define BI_BITFIELDS 3L
typedef struct tagRGBQUAD {
BYTE rgbBlue;
BYTE rgbGreen;
BYTE rgbRed;
BYTE rgbReserved;
} RGBQUAD;
typedef RGBQUAD * LPRGBQUAD;
#define MAKEWORD(a, b) ((WORD)(((BYTE)(a)) | ((WORD)((BYTE)(b))) << 8))
#define MAKELONG(a, b) ((LONG)(((WORD)(a)) | ((DWORD)((WORD)(b))) << 16))
#define LOWORD(l) ((WORD)(l))
#define HIWORD(l) ((WORD)(((DWORD)(l) >> 16) & 0xFFFF))
#define LOBYTE(w) ((BYTE)(w))
#define HIBYTE(w) ((BYTE)(((WORD)(w) >> 8) & 0xFF))
//---yk--- add
#include "memory.h"
#include "math.h"
#include "stdio.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(BYTE dchufindex, BYTE 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;
//HPALETTE hPalette=NULL;
//HBITMAP hBitmap=NULL;
char * hImgData = NULL;
DWORD NumColors;
DWORD LineBytes;
DWORD ImgWidth = 0, ImgHeight = 0;
char* 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;
BOOL LoadJpegFile(char *JpegFileName)
{
FILE* hfjpg;
DWORD ImgSize;
DWORD BufSize, JpegBufSize;
FILE* hfbmp;
FILE* IMGdata;
void * hJpegBuf;
int funcret;
DWORD i;
LPBITMAPINFOHEADER lpImgData;
char * hImgData256;
fopen_s(&hfjpg, JpegFileName, "rb");
//get jpg file length
fseek(hfjpg, 0L, SEEK_END);
JpegBufSize = ftell(hfjpg);
//rewind to the beginning of the file
fseek(hfjpg, 0L, SEEK_SET);
if ((hJpegBuf = malloc(JpegBufSize)) == NULL)
{
fclose(hfjpg);
showerror(FUNC_MEMORY_ERROR);
return FALSE;
}
lpJpegBuf = (unsigned char *)hJpegBuf;
fread((unsigned char *)hJpegBuf, sizeof(char), JpegBufSize, hfjpg);
fclose(hfjpg);
InitTable();
if ((funcret = InitTag()) != FUNC_OK)
{
// GlobalUnlock(hJpegBuf);
free(hJpegBuf);
showerror(funcret);
return FALSE;
}
//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;
printf("bi.biWidth is %ld/n", bi.biWidth);
printf("bi.biBitCount is %ld/n", bi.biBitCount);
LineBytes = (DWORD)WIDTHBYTES(bi.biWidth*bi.biBitCount);
printf("LineBytes is %ld/n", LineBytes);
ImgSize = (DWORD)LineBytes*bi.biHeight;//???????
printf("size is %ld/n", ImgSize);
bf.bfType = 0x4d42;
int a = sizeof(BITMAPFILEHEADER);
int b = sizeof(BITMAPINFOHEADER);
//注意字节对齐问题!!!!!!!!!!!!!!!!!!!!!!!!1
//如果没有#pragma pack(1)，a是16~~~~~~~
int c = NumColors*sizeof(RGBQUAD);
bf.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+NumColors*sizeof(RGBQUAD)+ImgSize;
bf.bfOffBits = 54;//(DWORD)(NumColors*sizeof(RGBQUAD)+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER));
BufSize = bf.bfSize - sizeof(BITMAPFILEHEADER);
// printf("size is %ld/n",BufSize);
if ((hImgData = (char*)malloc(BufSize)) == NULL)
{
//GlobalUnlock(hJpegBuf);
free(hJpegBuf);
showerror(FUNC_MEMORY_ERROR);
showerror(FUNC_MEMORY_ERROR);
return FALSE;
}
// lpImgData=(LPBITMAPINFOHEADER)GlobalLock(hImgData);
lpImgData = (LPBITMAPINFOHEADER)hImgData;
memcpy(lpImgData, (char *)&bi, sizeof(BITMAPINFOHEADER));
lpPtr = (char *)lpImgData + sizeof(BITMAPINFOHEADER);
if ((SampRate_Y_H == 0) || (SampRate_Y_V == 0))
{
// GlobalUnlock(hJpegBuf);
free(hJpegBuf);
//GlobalUnlock(hImgData);
free(hImgData);
hImgData = NULL;
showerror(FUNC_FORMAT_ERROR);
return FALSE;
}
funcret = Decode();
if (funcret == FUNC_OK)
{
fopen_s(&hfbmp, "jpeg2-bmp.bmp", "wb");
fwrite((LPSTR)&bf, sizeof(BITMAPFILEHEADER), 1, hfbmp);
fwrite((LPSTR)lpImgData, sizeof(char), BufSize, hfbmp);
fopen_s(&IMGdata, "111.txt", "wb");
DWORD xx = ImgWidth*ImgHeight;
if ((hImgData256 = (char *)malloc(xx)) == NULL)
{
//GlobalUnlock(hJpegBuf);
free(hImgData256);
showerror(FUNC_MEMORY_ERROR);
showerror(FUNC_MEMORY_ERROR);
showerror(FUNC_MEMORY_ERROR);
return FALSE;
}
char * temp = hImgData256;
for (i = 0; i < xx; i++)
{
i;
char t3 = *lpPtr;
t3 &= 0xE0;
char t1 = *(lpPtr + 1);
t1 = t1 >> 3;
t1 &= 0x1c;
char t2 = *(lpPtr + 2);
t2 = t2 >> 6;
t2 &= 0x03;
char t4 = t3 + t1 + t2;
*temp++ = t4;
lpPtr = lpPtr + 3;
//不能使用temp+=3;
}
int count = fwrite(hImgData256, sizeof(char), xx, IMGdata);
fclose(IMGdata);
fclose(hfbmp);
free(hJpegBuf);
return TRUE;
}
else
{
free(hJpegBuf);
free(hImgData);
hImgData = NULL;
showerror(funcret);
return FALSE;
}
}
/
void showerror(int funcret)
{
switch (funcret)
{
case FUNC_MEMORY_ERROR:
printf("Error alloc memory/n!");
break;
case FUNC_FILE_ERROR:
printf("File not found!/n");
break;
case FUNC_FORMAT_ERROR:
printf("File format error!/n");
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<64; i++){
Y[i] = 0;
U[i] = 0;
V[i] = 0;
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;
buf = Y;
pQtZzMCU = QtZzMCUBuffer;
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;
pMCUBuffer = MCUBuffer;
pQtZzMCUBuffer = QtZzMCUBuffer;
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;
pQt = YQtTable;
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];
}
int main()
{
long time = clock();
LoadJpegFile("0.jpg");
printf("%d\n", clock() - time);
return 0;
}
转载自：https://blog.csdn.net/weixinhum/article/details/44755009
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