Hi Laurent,
Am Donnerstag, den 28.08.2014, 14:24 +0200 schrieb Laurent Pinchart:
> > A driver could then do the following:
> >
> > static struct v4l2_pixfmt_info driver_formats[] = {
> > { .pixelformat = V4L2_PIX_FMT_YUYV },
> > { .pixelformat = V4L2_PIX_FMT_YUV420 },
> > };
> >
> > int driver_probe(...)
> > {
> > ...
> > v4l2_init_pixfmt_array(driver_formats,
> > ARRAY_SIZE(driver_formats));
> > ...
> > }
>
> Good question. This option consumes more memory, and prevents the driver-
> specific format info arrays to be const, which bothers me a bit.
Also, this wouldn't help drivers that don't want to take these
additional steps, which probably includes a lot of camera drivers with
only a few formats.
> On the other hand it allows drivers to override some of the default
> values for odd cases.
Hm, but those cases don't have to use the v4l2_pixfmt_info at all.
> I won't nack this approach, but I'm wondering whether a better
> solution wouldn't be possible. Hans, Mauro, Guennadi, any opinion ?
We could keep the global v4l2_pixfmt_info array sorted by fourcc value
and do a binary search (would have to be kept in mind when adding new
formats) or build a hash table (more complicated code, consumes memory).
regards
Philipp
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