On Sun, Dec 6, 2015 at 2:23 AM, Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx> wrote: > Le dimanche 06 décembre 2015 à 00:00 +0200, Ran Shalit a écrit : >> Hello, >> >> I would like to ask a general question regarding methods to debug a >> v4l2 device driver. >> Since I assume that the kernel driver will probably won't work in >> first try after coding everything inside the device driver... >> >> 1. Do you think qemu/kgdb debugger is a good method for the device >> driver debugging , or is it plain printing ? >> >> 2. Is there a simple way to display the image of a YUV-like buffer in >> memory ? > > Most Linux distribution ships GStreamer. You can with GStreamer read > and display a raw YUV images (you need to know the specific format) > using videoparse element. > > gst-launch-1.0 filesrc location=my.yuv ! videoparse format=yuy2 width=320 height=240 ! imagefreeze ! videoconvert ! autovideosink > > You could also encode and store to various formats, replacing the > imagefreeze ... section with an encoder and a filesink. Note that > videoparse unfortunatly does not allow passing strides array or > offsets. So it will work only if you set the width/height to padded > width/height. > > regards, > Nicolas Hi Nicolas, Thank you for the comment. As someone expreinced with v4l2 device driver, do you recommened using debugging technique such as qemu (or kgdb) or do you rather use plain printing ? Thank you very much, Ran -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
