On Wed, 10 Apr 2024 06:46:09 +0000, BRES, Guillaume wrote: [...] > I can confirm that your driver is probed successfully, and so is > xlnx-vcu. Unfortunately the /dev/allegroIP entry point is not > created, therefore gstreamer has no means to operate this part. > > Is your driver supposed to create a /dev/allegroIP entry point like > the previous out-of-tree solution? Would you have ideas what we > might be missing (probably v4l related) that would cause the /dev > entry not to appear, while everything seems sane at the kernel level ? /dev/allegroIP is not a standard Linux API. The upstream driver creates a V4L2 device node as /dev/videoX. Therefore, you can't use the VCU control software or any of the related GStreamer elements, but you should use a user space that handles V4L2 mem2mem devices. For example, you may use the v4l2videoenc elements (they show up as v4l2h264enc/v4l2h265enc in the running system), which are part of gst-plugins-good. > > > This node doesn't follow the documented binding. There should be > > only two clocks and no interrupt. > > Is it clk/xlnx-vcu that we are talking about here? Yes, that's the related driver. Michael > > The driver is able to do h.264 and h.265 encoding with a few options > > for quality and rate control. In contrast to the downstream driver, > > it exposes a standard V4L2 video encoder interface to userspace. > > Which features do you need? I'm very open to review and test patches > > that add more features to improve and extend the upstream driver. > > I'm not advanced enough to correctly answer that question at the > moment. All I can say, is our first goal is to compress SDI-HD/SDI3G > standard formats, and our ultimate goal, once we master the VCU, would > be to compress slightly off standard formats, Like a couple of lines > or columns truncated. IMO this is feasible considering the VCU is said > to work on multiple of 4 pixels, it is not particularly limited to > standard formats. I presume we will tweak gstreamer to do that. Yet > we're not able to achieve step 1 and I personally have no clue how far > we are from that >
