YUV2Jpg(in_Y,in_U,in_V,0x400,0x1b0,75,0x420,pData,&dwSize);

参数说明：in_Y:输入的420的Y分量；in_U:输入的420的U分量，in_V：输入420的V分量；width:表示图像的宽；height表示图像的高；quality表示量化因子，n_Stride表示Yuv的跨度，即Yuv的宽，因为该函数只能处理16的整数倍，所以width为0x400；pOut表示转化后的数据；pnOutSize为转化后的jpeg文件的大小；

int YUV2Jpg(PBYTE in_Y,PBYTE in_U,PBYTE in_V,int width,int height,int quality,int nStride,PBYTE pOut,DWORD *pnOutSize)  //

{

PBYTE pYBuf,pUBuf,pVBuf;

int nYLen = nStride  * height;

int nUVLen = nStride  * height / 4;

int  nDataLen;

JPEGINFO JpgInfo;

ZeroMemory(&JpgInfo,sizeof(JPEGINFO));

JpgInfo.bytenew = 0;

JpgInfo.bytepos = 7;

pYBuf = (PBYTE)malloc(nYLen);                      //获取Y的值

memcpy(pYBuf,in_Y,nYLen);

pUBuf = (PBYTE)malloc(nYLen);

pVBuf = (PBYTE)malloc(nYLen);

ProcessUV(pUBuf,in_U,width,height,nStride);        //获取U的值

ProcessUV(pVBuf,in_V,width,height,nStride);        //获取V

//GetDataFromSource(pYBuf,pUBuf,pVBuf,in_Y,in_U,in_V,width);

DivBuff(pYBuf,width,height,nStride,DCTSIZE,DCTSIZE);

DivBuff(pUBuf,width,height,nStride,DCTSIZE,DCTSIZE);

DivBuff(pVBuf,width,height,nStride,DCTSIZE,DCTSIZE);

quality = QualityScaling(quality);

SetQuantTable(std_Y_QT,JpgInfo.YQT, quality); //设置Y量化表

SetQuantTable(std_UV_QT,JpgInfo.UVQT,quality); //设置UV量化表

InitQTForAANDCT(&JpgInfo);                       //初始化AA&N需要的量化表

JpgInfo.pVLITAB=JpgInfo.VLI_TAB + 2048;       //设置VLI_TAB的别名

BuildVLITable(&JpgInfo);                         //计算VLI表

nDataLen = 0;

//写入各段

nDataLen = WriteSOI(pOut,nDataLen);

nDataLen = WriteAPP0(pOut,nDataLen);

nDataLen = WriteDQT(&JpgInfo,pOut,nDataLen);

nDataLen = WriteSOF(pOut,nDataLen,width,height);

nDataLen = WriteDHT(pOut,nDataLen);

nDataLen = WriteSOS(pOut,nDataLen);

//计算Y/UV信号的交直分量的huffman表，这里使用标准的huffman表，并不是计算得出，缺点是文件略长，但是速度快

BuildSTDHuffTab(STD_DC_Y_NRCODES,STD_DC_Y_VALUES,JpgInfo.STD_DC_Y_HT);

BuildSTDHuffTab(STD_AC_Y_NRCODES,STD_AC_Y_VALUES,JpgInfo.STD_AC_Y_HT);

BuildSTDHuffTab(STD_DC_UV_NRCODES,STD_DC_UV_VALUES,JpgInfo.STD_DC_UV_HT);

BuildSTDHuffTab(STD_AC_UV_NRCODES,STD_AC_UV_VALUES,JpgInfo.STD_AC_UV_HT);

//处理单元数据

nDataLen = ProcessData(&JpgInfo,pYBuf,pUBuf,pVBuf,width,height,pOut,nDataLen);

nDataLen = WriteEOI(pOut,nDataLen);

free(pYBuf);

free(pUBuf);

free(pVBuf);

*pnOutSize = nDataLen;

return 0;

}

具体代码参考YUV2Jpg程序；