i.MX ProcessorsのトピックRe: i.MX8MP: Video buffer access

i.MX8MP: Video buffer access

artsiomstaliaro — Mon, 19 Jun 2023 16:17:58 GMT

Dears,

in "i.MX 8M Plus Camera and Display Guide" document (IMX8MPCDUG), in "3.4 Arbitrary Resolution Control" there is picture 17 shows 2 output buffers.

How can I access both buffers (before and after DeWrap)?

Re: i.MX8MP: Video buffer access

malik_cisse — Tue, 20 Jun 2023 07:29:26 GMT

Hi,
IMHO You cannot access both outputs at the same time (before and after DeWrap). You can do (before or after DeWrap). The doc says "If the Dewarp output is used"

If Dewarp is deactivated in device tree or set to bypass in corresponding JSON config file, you get ISP Scale Down output. If Dewarp is used, all Images are passed through Dewarp before you can access them.
Also, "output buffers" are only accessible via V4L2 API (e.g doing: gst-launch-1.0 v4l2src num-buffers=1 device=/dev/video0 ! video/x-raw,width=3840,height=2160 ! videoconvert ! pngenc ! multifilesink location=test.png)
Community, correct me if I am wrong I don't think you can access video output buffers outside of V4L2.

Re: i.MX8MP: Video buffer access

Bio_TICFSL — Tue, 20 Jun 2023 14:15:18 GMT

(y)

Re: i.MX8MP: Video buffer access

artsiomstaliaro — Fri, 24 Nov 2023 10:13:53 GMT

Would be nice if you guys in NXP can fix buffer accessing problems in IMX95 for example.
Like accessing full resolution image and accessing image after scaler