Hello, I have looked into some code for v4l capture . and now I can manage it successfully.Then ,i want to display the video from my pctv card. I learned overlay method is a good way .But something I cant understand exist. The first one : Is overlay implemented by dma? If it is ,does it means that I cant get the video data because it is transfered by pci bus direct to video memory. Then how can I get the content in the video mem to screen ? The second one: I learned SDL can do the yuv overlay display .but when I looked into the doc for sdl ,I found that when display yuvovelay surface, memcpy operation still is needed as follow. //memcpy(overlay->pixels, map, (width * height * 3) / 2); As you know , memcpy() is a slower way to transfer data.Then I want to ask these questions :Will overlay displaying with sdl cost most time of cpu ? How can I utilize the hardware accelerate to implement the yuv overlay displaying with SDL? Where can I find such examples or routines? The third one: can any way other than SDL be used to implement the same goal? Where can I find the example code ? Any help will be nice ,thanks in advance! __________________________________________________ Do You Yahoo!? Try FREE Yahoo! Mail - the world's greatest free email! http://mail.yahoo.com/
