[linux-dvb] DVB API update

Markus Rechberger mrechberger at gmail.com
Tue Sep 18 18:49:43 CEST 2007


On 9/18/07, Aidan Thornton <makosoft at googlemail.com> wrote:
> On 9/18/07, Markus Rechberger <mrechberger at gmail.com> wrote:
> > On 9/18/07, Manu Abraham <abraham.manu at gmail.com> wrote:
> > > Markus Rechberger wrote:
> > > > Hi,
> > > >
> > > >
> > > > Why don't abstract the dvb layer from enduser applications and put a
> > > > general library infront which does that version check and tries to
> > > > keep things consistend to the end applications?
> > >
> > > It is a nice idea, yes.
> > >
> > > Two things, looking at
> > > http://linuxtv.org/hg/dvb-apps/file/4bca5d49c9bd/lib/libdvbapi/dvbfe.c
> > >
> > > * This idea of using multiple API 's was thought (It is effective ,
> yes)
> > > You can use multiple API's in there
> > >
> > > * The down side is that user applications need to use this library
> > >
> > > Someone could ask, why the hell should we use your library. Well, that
> > > causes the headaches.
> > >
> >
> > people who use alsa also use the provided alsa API, it makes alot sense
> > to stop applications to directly access those nodes. libdvbapi seems to
> be
> > the right way to start over with.
> >
>
> I'm not sure ALSA is a good example - it's always felt a bit hairy to
> me. Part of the reason that people have to use alsalib is that
> important bits are in userland, and they tend to break in interesting
> ways.
>
> For example, I found that if a program using ALSA launches another
> program without closing the file descriptors correctly, sound playback
> breaks when the first program exits due to the odd way software mixing
> is done. There's various other annoying and non-intuitive ways that
> software mixing can break too.
>
> (I also get the impression that ALSA uses the library as an excuse to
> break kernel-userspace ABI compatibility, to the annoyance of distro
> maintainers. I can certainly recall several complaints about it on
> Diego "Flameeyes" Pettenò's blog back when he maintained ALSA on
> Gentoo.)
>
> Besides, it's a bit late to try and do this now...
>

alsa is just an example in case of documentation and since it seems like
that the DVB API won't be stable in future either such a way would be better.

Markus



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