Yuv420转Jpeg(C语言实现)
2016-03-01 11:07
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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;
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;
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