topic IPU RGBA Overlays in i.MX Processors

IPU RGBA Overlays

sebastient — Tue, 04 Jun 2013 10:35:32 GMT

I have a gstreamer plugin I was using on the I.mx53 to do video blending on the IPU using the overlay function which I've now ported to the I.mx6. I am having an issue with the alpha channel though. Using mxc_ipu_hl_lib I was able to have the overlays use the alpha channel within the RGBA image but this doesn't work anymore with the /dev/mxc_ipu interface. I am applying an overlay over a live video and the overlay is generated in OpenGL/openvg so I do need that alpha channel and as we're trying to hit at least 720p it needs to use IPU or GPU without copies.

Re: IPU RGBA Overlays

PrabhuSundarara — Wed, 19 Jun 2013 21:56:41 GMT

Please go through documentation. CPMEM is the register controlling the alpha. Please trace down how it is hitting the driver.

Re: IPU RGBA Overlays

sebastient — Wed, 19 Jun 2013 23:27:55 GMT

Could you point me to the documentation for the /dev/mxc_ipu interface? Thank you.

Re: IPU RGBA Overlays

rogerio_silva — Tue, 23 Jul 2013 13:43:38 GMT

Hi Sébastien,

IPU lib is not available on i.MX6. You can directly work with /dev/mxc_ipu and unfortunately we don't have any documentation so far.

You can take a look on these two examples about alpha blending: https://github.com/rogeriorps/ipu-examples/tree/master/mx6/alphablending

Best regards,

Rogerio Pimentel