[MPlayer-dev-eng] BSD BT848 Radio interface (patch)

[voroshil at gmail.com]

Bernd Ernesti wrote: 
> On Wed, Nov 15, 2006 at 11:54:24PM +0600, voroshil at gmail.com wrote:
> > RC wrote: 
> > > 
> > > If I tune it below 66MHz, then back to a normal station, I get static
> > > instead of sound...  This can be corrected by tuning to any frequency in
> > > tv:// mode.  It's unable to pick-up any signals below (precisely) 66MHz,
> > > despite a couple channels there, which I can tune to in tv:// mode.
> > > 
> > > I don't have the same tuning problem with higher frequencies... 
> > > However, the highest frequency I was able to recieve with radio://
> > > mode was 192MHz, despite numerous higher-frequency channels in tv://
> > > mode.
> > > 
> > > I guess 66 - 192 is approximately the limit, at least for my card.
> > 
> > I suggest to keep 87.5-108.0 frequency range for *BSD BT848, because 
> > *BSD kernel have such limit by default. If anybody wants to change it,
> > he needs at least to recompile kernel, so changing range in source code and
> > recompilation of MPlayer will not be so hard thing, i think.
> 
> Hmm, there are different kind of card which are supported by the bsd
> bt848 driver. This is not limited to the FM1246. The FM1236 is also
> supported and to quote from this manual:
> 
>  The front-end covers the TV bands from 55.25 MHz to 801.25 MHz, inclusive of
>  the Japanese TV bands from 91.25 MHz to 765.25 MHz. The FM band covers the
>  standard 87.50 MHz to 108.00 MHz and also the Japanese FM band (76.00 MHz to
>  91.00 MHz).
> 
> Ok, this means that this was not really tested, but it should work.
> 
> > It is also possible to add freq_min,freq_max parameters for using with bt848.
> > If such parameters need, i suggest to add them as separate patch.
> 
> Hmm, do you mean something which could be used as a command line option or
> ~/.mplayer/conf entry?
As a suboption of -radio option.
It will be usable as -radio freq_min=<value>,freq_max=<value> command line option 
or radio=freq_min=<value>:freq_max=<value>
entry in ~/.mplayer/conf (as most of options can be used).
> 
> > According to above i have two questions:
> > 1. Can i apply attached patch with 87.5-108.0 range limit (i also have changeed default
> > radio device for bt848 to /dev/tuner0)?
> 
> NetBSD uses different major and minor numbers for /dev/radio* and /dev/tuner*
> 
> But it seems that we use /dev/tuner too when I look at the xmradio source code.
> So it should be ok.
> 
> > 2. Does freq_min and freq_max parameters need for bt848? 
> 
> See my question above. I would like it that way.
Ok. I'll add freq_min and freq_max.
> 
> Bernd
> 
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-- 
Regards,
Vladimir Voroshilov mailto:voroshil at gmail.com
Omsk State University
JID: voroshil at jabber.ru
ICQ: 95587719