{"id":602,"date":"2008-08-24T13:30:29","date_gmt":"2008-08-24T11:30:29","guid":{"rendered":"https:\/\/alax.info\/blog\/?p=602"},"modified":"2011-03-04T22:18:18","modified_gmt":"2011-03-04T20:18:18","slug":"how-to-save-image-to-bmp-file-from-ibasicvideo-or-vmr-windowless-interface","status":"publish","type":"post","link":"https:\/\/alax.info\/blog\/602","title":{"rendered":"How To: Save image to BMP file from IBasicVideo or VMR windowless interface"},"content":{"rendered":"

A simple question being asked all over again. Given IBasicVideo<\/a>, IBasicVideo2<\/a>, IVMRWindowlessControl<\/a> or IVMRWindowlessControl9<\/a>, how to save image to file? It is easy. It is a bit easier with IBasicVideo<\/a> because it is possible to query this interface directly from graph’s interface, such as IGraphBuilder<\/a>, and the call will be forwarded to video renderer. This code assumes internal bitmap format is non-paletted, which I believe is always the case.<\/p>\n

LONG<\/span> nBufferSize =<\/span> 0<\/span>;<\/span>\r\nATLENSURE_SUCCEEDED(<\/span>pBasicVideo-<\/span>><\/span>GetCurrentImage(<\/span>&<\/span>nBufferSize,<\/span> NULL<\/span>)<\/span>)<\/span>;<\/span>\r\nCHeapPtr<<\/span>BITMAPINFO<\/span>><\/span> pBitmapInfo;<\/span>\r\nATLENSURE_THROW(<\/span>pBitmapInfo.<\/span>AllocateBytes(<\/span>nBufferSize)<\/span>,<\/span> E_OUTOFMEMORY)<\/span>;<\/span>\r\nATLENSURE_SUCCEEDED(<\/span>pBasicVideo-<\/span>><\/span>GetCurrentImage(<\/span>&<\/span>nBufferSize,<\/span> (<\/span>LONG<\/span>*<\/span>)<\/span> (<\/span>BITMAPINFO<\/span>*<\/span>)<\/span> pBitmapInfo)<\/span>)<\/span>;<\/span>\r\nconst<\/span> BYTE<\/span>*<\/span> pnData =<\/span> (<\/span>const<\/span> BYTE<\/span>*<\/span>)<\/span> (<\/span>&<\/span>pBitmapInfo-<\/span>><\/span>bmiHeader +<\/span> 1<\/span>)<\/span>;<\/span>\r\n\/\/ NOTE: You might wish to handle <=8 bpp bitmaps here<\/span>\r\nATLASSERT(<\/span>pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biBitCount ><\/span> 8<\/span>)<\/span>;<\/span>\r\nATLASSERT(<\/span>pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biCompression =<\/span>=<\/span> BI_RGB)<\/span>;<\/span>\r\nATLASSERT(<\/span>pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biSizeImage)<\/span>;<\/span>\r\nBITMAPFILEHEADER<\/span> BitmapFileHeader;<\/span>\r\nZeroMemory<\/span>(<\/span>&<\/span>BitmapFileHeader,<\/span> sizeof<\/span> BitmapFileHeader)<\/span>;<\/span>\r\nBitmapFileHeader.<\/span>bfType =<\/span> 'MB'<\/span>;<\/span>\r\nBitmapFileHeader.<\/span>bfSize =<\/span> (<\/span>DWORD<\/span>)<\/span> (<\/span>sizeof<\/span> (<\/span>BITMAPFILEHEADER<\/span>)<\/span> +<\/span> pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biSize +<\/span> pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biSizeImage)<\/span>;<\/span>\r\nBitmapFileHeader.<\/span>bfOffBits =<\/span> (<\/span>DWORD<\/span>)<\/span> (<\/span>sizeof<\/span> (<\/span>BITMAPFILEHEADER<\/span>)<\/span> +<\/span> pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biSize)<\/span>;<\/span>\r\nATLENSURE_SUCCEEDED(<\/span>File.<\/span>Write(<\/span>&<\/span>BitmapFileHeader,<\/span> sizeof<\/span> BitmapFileHeader)<\/span>)<\/span>;<\/span>\r\nATLENSURE_SUCCEEDED(<\/span>File.<\/span>Write(<\/span>&<\/span>pBitmapInfo-<\/span>><\/span>bmiHeader,<\/span> pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biSize)<\/span>)<\/span>;<\/span>\r\nATLENSURE_SUCCEEDED(<\/span>File.<\/span>Write(<\/span>pnData,<\/span> (<\/span>DWORD<\/span>)<\/span> pBitmapInfo-<\/span>><\/span>bmiHeader.<\/span>biSizeImage)<\/span>)<\/span>;<\/span><\/pre>\n","protected":false},"excerpt":{"rendered":"
A simple question being asked all over again. Given IBasicVideo, IBasicVideo2, IVMRWindowlessControl or IVMRWindowlessControl9, how to save image to file? It is easy. It is a bit easier with IBasicVideo because it is possible to query this interface directly from graph’s interface, such as IGraphBuilder, and the call will be forwarded to video renderer. This… <\/p>\n
Read the full article<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,10],"tags":[487,112,38,47,113,486,111],"class_list":["post-602","post","type-post","status-publish","format-standard","hentry","category-atl","category-video","tag-atl","tag-bmp","tag-c","tag-howto","tag-image","tag-video","tag-vmr"],"_links":{"self":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts\/602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/comments?post=602"}],"version-history":[{"count":0,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts\/602\/revisions"}],"wp:attachment":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/media?parent=602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/categories?post=602"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/tags?post=602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}