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 Szyprowski, PhD
Samsung R&D Institute Poland
