Laurent Pinchart a écrit : > On Thursday 06 August 2009 20:46:14 David Xiao wrote: > > Think about the simple following use case. An application wants to display > video it acquires from the device to the screen using Xv. The video buffer is > allocated by Xv. Using the v4l2 user pointer streaming method, the device can > DMA directly to the Xv buffer. Using driver-allocated buffers, a memcpy() is > required between the v4l2 buffer and the Xv buffer. > v4l2 got an API (overlay IRRC) that allow drivers to write directly in framebuffer memory. BTW Xv buffer is not always in video memory and the X driver can do a memcpy.
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