{"id":475,"date":"2008-07-24T20:24:30","date_gmt":"2008-07-24T18:24:30","guid":{"rendered":"https:\/\/alax.info\/blog\/?p=475"},"modified":"2009-09-27T11:07:19","modified_gmt":"2009-09-27T09:07:19","slug":"video-conversion-yuy2-to-yv12","status":"publish","type":"post","link":"https:\/\/alax.info\/blog\/475","title":{"rendered":"Video Conversion: YUY2 to YV12"},"content":{"rendered":"

See topic on MSDN Forums<\/a> about coloring issue.<\/p>\n

This is a demo of YUY2<\/a> to YV12<\/a> conversion as suggested copying Y values and averaging U and V.<\/p>\n

\"\"<\/a><\/p>\n

Original image is on the right.<\/p>\n

Code snippet to perform the transformation:<\/p>\n

<\/p>\n

ATLASSERT(<\/span>pInputBitmapInfoHeader-<\/span>><\/span>biCompression =<\/span>=<\/span> FOURCC_YUY2)<\/span>;<\/span>\r\nconst<\/span> CSize<\/span> Extent =<\/span> pInputVideoInfoHeader-<\/span>><\/span>GetExtent(<\/span>)<\/span>;<\/span>\r\nATLASSERT(<\/span>Extent =<\/span>=<\/span> pOutputVideoInfoHeader-<\/span>><\/span>GetExtent(<\/span>)<\/span>)<\/span>;<\/span>\r\nconst<\/span> BYTE<\/span>*<\/span> pnInputData =<\/span> InputMediaBuffer.<\/span>m_pnData;<\/span>\r\nSSIZE_T nFirstInputRowOffset,<\/span> nNextInputRowOffset;<\/span>\r\npInputVideoInfoHeader-<\/span>><\/span>GetData(<\/span>nFirstInputRowOffset,<\/span> nNextInputRowOffset)<\/span>;<\/span>\r\nATLASSERT(<\/span>!<\/span>nFirstInputRowOffset)<\/span>;<\/span>\r\nBYTE<\/span>*<\/span> pnOutputData =<\/span> OutputMediaBuffer.<\/span>m_pnData;<\/span>\r\nSSIZE_T nFirstOutputRowOffset,<\/span> nNextOutputRowOffset;<\/span>\r\npOutputVideoInfoHeader-<\/span>><\/span>GetData(<\/span>nFirstOutputRowOffset,<\/span> nNextOutputRowOffset)<\/span>;<\/span>\r\nATLASSERT(<\/span>!<\/span>nFirstOutputRowOffset)<\/span>;<\/span>\r\nBYTE<\/span>*<\/span> pnOutputDataY =<\/span> pnOutputData;<\/span>\r\nBYTE<\/span>*<\/span> pnOutputDataV =<\/span> pnOutputDataY +<\/span> Extent.<\/span>cy *<\/span> nNextOutputRowOffset;<\/span>\r\nBYTE<\/span>*<\/span> pnOutputDataU =<\/span> pnOutputDataV +<\/span> (<\/span>Extent.<\/span>cy *<\/span> nNextOutputRowOffset)<\/span> \/<\/span> 4<\/span>;<\/span>\r\nATLTRACE2(<\/span>atlTraceGeneral,<\/span> 5<\/span>,<\/span> _T(<\/span>\"<\/span>pnInputData 0x<\/span>%08x<\/span> - 0x<\/span>%08x<\/span>, Extent { <\/span>%d<\/span>, <\/span>%d<\/span> }, pnOutputData 0x<\/span>%08x<\/span> - 0x<\/span>%08x<\/span>\\n<\/span>\"<\/span>)<\/span>,<\/span> pnInputData,<\/span> pnInputData +<\/span> pInputBitmapInfoHeader-<\/span>><\/span>biSizeImage,<\/span> Extent.<\/span>cx,<\/span> Extent.<\/span>cy,<\/span> pnOutputData,<\/span> pnOutputData +<\/span> pOutputBitmapInfoHeader-<\/span>><\/span>biSizeImage)<\/span>;<\/span>\r\nATLTRACE2(<\/span>atlTraceGeneral,<\/span> 5<\/span>,<\/span> _T(<\/span>\"<\/span>nFirstInputRowOffset <\/span>%d<\/span>, nNextInputRowOffset <\/span>%d<\/span>, nFirstOutputRowOffset <\/span>%d<\/span>, nNextOutputRowOffset <\/span>%d<\/span>\\n<\/span>\"<\/span>)<\/span>,<\/span> nFirstInputRowOffset,<\/span> nNextInputRowOffset,<\/span> nFirstOutputRowOffset,<\/span> nNextOutputRowOffset)<\/span>;<\/span>\r\nATLTRACE2(<\/span>atlTraceGeneral,<\/span> 5<\/span>,<\/span> _T(<\/span>\"<\/span>pnOutputDataY 0x<\/span>%08x<\/span>, pnOutputDataV 0x<\/span>%08x<\/span>, pnOutputDataU 0x<\/span>%08x<\/span>\\n<\/span>\"<\/span>)<\/span>,<\/span> pnOutputDataY,<\/span> pnOutputDataV,<\/span> pnOutputDataU)<\/span>;<\/span>\r\nSSIZE_T nInputRowOffset =<\/span> nFirstInputRowOffset;<\/span>\r\nfor<\/span>(<\/span>LONG<\/span> nY =<\/span> 0<\/span>;<\/span> nY <<\/span> Extent.<\/span>cy;<\/span> nY +<\/span>=<\/span> 2<\/span>)<\/span>\r\n{<\/span>\r\n    SSIZE_T nInputOffset =<\/span> nInputRowOffset;<\/span>\r\n    for<\/span>(<\/span>LONG<\/span> nX =<\/span> 0<\/span>;<\/span> nX <<\/span> Extent.<\/span>cx;<\/span> nX +<\/span>=<\/span> 2<\/span>)<\/span>\r\n    {<\/span>\r\n        pnOutputDataY[<\/span>0<\/span>]<\/span> =<\/span> pnInputData[<\/span>nInputOffset +<\/span> 0<\/span>]<\/span>;<\/span>\r\n        const<\/span> BYTE<\/span> nU0 =<\/span> pnInputData[<\/span>nInputOffset +<\/span> 1<\/span>]<\/span>;<\/span>\r\n        pnOutputDataY[<\/span>1<\/span>]<\/span> =<\/span> pnInputData[<\/span>nInputOffset +<\/span> 2<\/span>]<\/span>;<\/span>\r\n        const<\/span> BYTE<\/span> nV0 =<\/span> pnInputData[<\/span>nInputOffset +<\/span> 3<\/span>]<\/span>;<\/span>\r\n        pnOutputDataY[<\/span>nNextOutputRowOffset +<\/span> 0<\/span>]<\/span> =<\/span> pnInputData[<\/span>nInputOffset +<\/span> nNextInputRowOffset +<\/span> 0<\/span>]<\/span>;<\/span>\r\n        const<\/span> BYTE<\/span> nU1 =<\/span> pnInputData[<\/span>nInputOffset +<\/span> nNextInputRowOffset +<\/span> 1<\/span>]<\/span>;<\/span>\r\n        pnOutputDataY[<\/span>nNextOutputRowOffset +<\/span> 1<\/span>]<\/span> =<\/span> pnInputData[<\/span>nInputOffset +<\/span> nNextInputRowOffset +<\/span> 2<\/span>]<\/span>;<\/span>\r\n        const<\/span> BYTE<\/span> nV1 =<\/span> pnInputData[<\/span>nInputOffset +<\/span> nNextInputRowOffset +<\/span> 3<\/span>]<\/span>;<\/span>\r\n        pnOutputDataU[<\/span>0<\/span>]<\/span> =<\/span> (<\/span>nU0 +<\/span> nU1)<\/span> \/<\/span> 2<\/span>;<\/span>\r\n        pnOutputDataV[<\/span>0<\/span>]<\/span> =<\/span> (<\/span>nV0 +<\/span> nV1)<\/span> \/<\/span> 2<\/span>;<\/span>\r\n        nInputOffset +<\/span>=<\/span> 4<\/span>;<\/span>\r\n        pnOutputDataY +<\/span>=<\/span> 2<\/span>;<\/span>\r\n        pnOutputDataV +<\/span>=<\/span> 1<\/span>;<\/span>\r\n        pnOutputDataU +<\/span>=<\/span> 1<\/span>;<\/span>\r\n    }<\/span>\r\n    nInputRowOffset +<\/span>=<\/span> 2<\/span> *<\/span> nNextInputRowOffset;<\/span>\r\n    pnOutputDataY +<\/span>=<\/span> 2<\/span> *<\/span> nNextOutputRowOffset -<\/span> Extent.<\/span>cx;<\/span>\r\n    pnOutputDataV +<\/span>=<\/span> nNextOutputRowOffset \/<\/span> 2<\/span> -<\/span> Extent.<\/span>cx \/<\/span> 2<\/span>;<\/span>\r\n    pnOutputDataU +<\/span>=<\/span> nNextOutputRowOffset \/<\/span> 2<\/span> -<\/span> Extent.<\/span>cx \/<\/span> 2<\/span>;<\/span>\r\n}<\/span>\r\nATLTRACE2(<\/span>atlTraceGeneral,<\/span> 5<\/span>,<\/span> _T(<\/span>\"<\/span>pnOutputDataY 0x<\/span>%08x<\/span>, pnOutputDataV 0x<\/span>%08x<\/span>, pnOutputDataU 0x<\/span>%08x<\/span>\\n<\/span>\"<\/span>)<\/span>,<\/span> pnOutputDataY,<\/span> pnOutputDataV,<\/span> pnOutputDataU)<\/span><\/pre>\n
See also:<\/p>\n