[Slackbuilds-users] libdv: a problem and a possible fix

[Luiz Carlos Ramos]

On Thu, May 26, 2016 at 07:12:36PM +0200, Matteo Bernardini wrote:
> 2016-05-26 18:36 GMT+02:00 Luiz Carlos Ramos <lramos.prof at yahoo.com.br>:
> > On Thu, May 26, 2016 at 09:22:34PM +0700, Willy Sudiarto Raharjo wrote:
> >> > recently I've built libdv using the slackbuild, and got a problem.
> >> >
> >> > Basically, the source libdv/enc_input.c uses a macro (VIDEO_MAX_FRAME)
> >> > possibly defined in /usr/include/linux/videodev.h. Looking at that file,
> >> > the macro isn't defined, and so the build process stop with a proper
> >> > error.
> >> >
> >> > I have to say I'm not using the stock kernel, but 3.16.3. I
> >> > don't know if this problem is specific to this kernel or if it applies
> >> > to the stock 14.1 kernel as well (or to -current).
> >> >
> >> > Making some investigation, I've found that this macro is defined at
> >> > /usr/include/linux/videodev2.h, and it's defined with 32. Also,
> >> > at least one case was solved defining this macro at the application
> >> > level, such as
> >> > https://lists.debian.org/debian-glibc/2006/07/msg00149.html, for
> >> > instance (although recognizing this case is not about libdv at all).
> >> >
> >> > What I did was defining that macro in libdv/enc_input.c if it's not
> >> > still not defined. I've built a patch to that file and included it at
> >> > the SlackBuild script. The git patch goes attached.
> >> >
> >> > Another option, which I didn't try, was to substitute #include videodev.h to
> >> > #include videodev2.h.
> >> >
> >> > Hope this can help the community!
> >>
> >> Hi Luiz
> >>
> >> May i know which Slackware version do you use ?
> >> 14.1 or current?
> >>
> >
> > 14.1, with a different kernel as mentioned above (3.16.3).
> 
> Hi Luiz,
> 
> I just tried building libdv on slackware-14.1 and slackware64-14.1 and
> in either case the build process just bypass that header
> 
> ...
> checking for unistd.h... (cached) yes
> checking linux/videodev.h usability... no
> checking linux/videodev.h presence... no
> checking for linux/videodev.h... no
> checking sys/soundcard.h usability... yes
> ...
> 
> libdv hasn't been updated since ten years and that header was part of
> the old v4l, that unfortunately isn't available anymore.
> 
> the best solution, IMHO, is to left it as-is, ignoring support for v4l
> devices in libdv.
> 
> Matteo

Yes, Matteo, I've double check my installation and videodev.h seem like a
trash left there after some experiments (possibly with an older version of
skype).

Even I'm satisfied with the build with videodev.h, I agree with you
that it's better to leave as it is, that is, with videodev2.h.

Thanks,

Luiz


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