Re: pac7302-webcams and libv4lconvert interaction

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 09/12/2012 04:36 PM, Frank Schäfer wrote:

<snip>

>
> And a negative side effect is, that unknown pac7302 devices (with no
> V4LCONTROL_ROTATED_90_JPEG entry in libv4lconvert) do not work.
> With a consistent API behavior, they would work fine (output a rotated
> image). Users would at least know that their device is working and most
> of them know what to do next.
> For image rotation, we still need to add an entry to libv4lconvert and
> to modify it to invert the width and height values in v4l2_pix_format in
> this case.

That is a good point, unfortunately we are stuck with how we are doing
things now, since changing things would break the kernel ABI.

Also ...

>
> The device I have here is a good example: many people reported this
> device as not working years ago, one of them even got a hint in a forum
> that this could be a pac7302 device 2 years ago.
> But with the gpsca-pac7302 driver, he got no picture and gave up.
> And if I had not started q4vl2 from the terminal and had noticed the
> error message from libv4lconvert, I would have needed much more time to
> find out what's wrong...

True, OTOH just having this fixed won't help a regular user, as he/she
would still need to first add the new usb-id to the pac7302 driver...

Regards,

Hans