Em Mon, 18 Dec 2017 09:19:11 +0100 Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> escreveu: > Hi Hans, > > On 2017-12-15 16:57, Hans Verkuil wrote: > > On 14/12/17 15:11, Marek Szyprowski wrote: > >> I would like to get your opinion on this patch. Do you think it makes sense to: > >> > >> 1. add limited support for USERPTR and DMA-buf import? (limited means driver will accept setting buffer pointer/fd only once after reqbufs for each buffer index) > > I don't like this. It's unexpected almost-but-not-quite behavior that will make > > life very difficult for userspace. > > > >> 2. add a V4L2 device flag to let userspace to discover if device support queue buffer reconfiguration on-fly or not? > > This seems to me a better approach. It should be possible to implement most/all of this > > in vb2, but we need to find a way to signal this to the user. > > Okay, I will prepare a patch with such flag soon. > > > Is this an MFC limitation for the decoder, encoder or both? And is it a limitation > > of the capture or output side or both? > > Both and both. DMA addresses of all buffers must be known while > initializing decoder > and encoder. > > > ... > > Best regards Marek/Sylwester, What's the status of this one? The patch still applies (with a minor conflict). Thanks, Mauro
