Re: [libv4l] Bytes per Line

[Gregor Jasny <gjasny@googlemail.com>]

Hello,

On 2/15/12 4:53 PM, Robert Abel wrote:
> Basically, I found that libv4l and its conversion functions usually
> choose to ignore v4l2_pix_format.bytesperline, which seems to work out
> most of the time.

> I patched the issue for bayer => rgbbgr24 and will possibly fix it for
> bayer => yuv as well.
> 
> Is there a general understanding that v4l media drivers must not pad
> their data, or that libv4l is ignoring padding?
> I've worked with some webcams in the past and they all padded their
> data, so I'm wondering if assuming bytesperline = width was done on
> purpose and by design of out of necessity (speed..?) or if it just
> happened to work for most people?

As far as I understand the V4L2 spec the bytesperline != width is no
optional feature. If post your patches here I'll review them and add
them to the development tree.

Thanks,
Gregor