Hi Mauro, On Tuesday 21 December 2010 12:10:18 Mauro Carvalho Chehab wrote: > > You didn't understand me: uvcvideo is returning -EBUSY to format changes > with buffers freed.
As explained in my answer to Hans, that's on purpose. The uvcvideo driver releases buffers when calling REQBUFS(0). However, the file handle is still marked as owning the device for streaming purpose, so other applications can't change the format or request buffers. The reason for that is to avoid race conditions when an application wants to change the resolution during capture. As the application has to stop capture, call REQBUFS(0), change the format, request buffers and restart capture, it prevents another application from racing it after REQBUFS(0). As Hans correctly pointed out, this should be implemented using the priority ioctls. I will fix that. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
