<div class="gmail_quote">2009/1/22 Tomas Carnecky <<a href="mailto:tom@dbservice.com">tom@dbservice.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="Ih2E3d">On 01/22/2009 06:15 AM, Amos Tibaldi wrote: </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d"> Hello, I am trying to use the Xv extension in order to display images on windows. I have obtained the image formats with </div><a href="http://xvc.fo" target="_blank">xvc.fo</a> <<a href="http://xvc.fo" target="_blank">http://xvc.fo</a>> = XvListImageFormats( xvc.display, xvc.port, (int<div class="Ih2E3d"> *)&formats ); and I have chosen the format id: 0x59565955 (UYVY) guid: 55595659-0000-0010-8000-00aa00389b71 bits per pixel: 16 number of planes: 1 type: YUV (packed) </div></blockquote> [snip]<div class="Ih2E3d"> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> and to display the image with void XVWindow::Redraw() { unsigned short int u, y, v; RGBToUYVY(255,255,0,&u,&y,&v); unsigned short int thecolor = u << 12 | y << 8 | v << 4 | y; for ( int y=0; y<ImageHeight; y++ ) for ( int x=0; x<ImageWidth; x++ ) ((unsigned short int *)BGimage->data)[ y * ImageWidth + x ] = thecolor; counter++; XvPutImage( xvc.display, xvc.port, window, gc, BGimage, 0, 0, ImageWidth, ImageHeight, 0, 0, WindowWidth, WindowHeight ); } </blockquote> </div> I think you are confused by 'bits per pixel: 16' in the Xv format list. Your code in :Redraw() that composes the pixel is wrong. I know I couldn't explain it better, so I'm including a link to a website that explains it pretty well: <a href="http://www.fourcc.org/yuv.php#YUY2" target="_blank">http://www.fourcc.org/yuv.php#YUY2</a> (Each macropixel is 32 bits, so each of the YUV components is 8 bit and not 4 like you used in your code) tom </blockquote></div>Hello, BGImage->data_size is equal to w x h x 2 bytes (2B per pixel in the data allocated), and X has calculated it. Moreover I have tried even with <<24 |<<16|<<8 and the thing is the same. Are you sure of that? Thanks, -- Amos Tibaldi