On Fri, Jun 01, 2012 at 03:08:57PM +0530, Bhupesh Sharma wrote: > This patch reworks the videobuffer management logic present in the UVC > webcam gadget and ports it to use the "more apt" videobuf2 framework for > video buffer management. > > To support routing video data captured from a real V4L2 video capture > device with a "zero copy" operation on videobuffers (as they pass from the V4L2 > domain to UVC domain via a user-space application), we need to support USER_PTR > IO method at the UVC gadget side. > > So the V4L2 capture device driver can still continue to use MMAO IO method > and now the user-space application can just pass a pointer to the video buffers > being DeQueued from the V4L2 device side while Queueing them at the UVC gadget > end. This ensures that we have a "zero-copy" design as the videobuffers pass > from the V4L2 capture device to the UVC gadget. > > Note that there will still be a need to apply UVC specific payload headers > on top of each UVC payload data, which will still require a copy operation > to be performed in the 'encode' routines of the UVC gadget. > > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxx> this patch doesn't apply. Please refresh on top of v3.5-rc1 or my gadget branch which I will update in a while. -- balbi
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