[linux-dvb] Re: RFC: patch for support of volume control on DVB-C+analogue-module

[Andreas Kool <akool@akool.de>]

On Thursday 24 April 2003 12:04, Dr. Werner Fink wrote:
> On Wed, Apr 23, 2003 at 09:24:00PM +0200, Andreas Kool wrote:
> > On Wednesday 23 April 2003 21:05, Andreas Oberritter wrote:
> > > On Wed, 2003-04-23 at 20:47, Andreas Kool wrote:
> > > > I am using the AC3overDVB patch with VDR (means: i use the
> > > > "Digital-Out" of the DVB-C card). I am still not able to control the
> > > > volume of this output :-(
> > > >
> > > > Does anybody out there know, how to control the volume of the
> > > > "Digital-Out"? Or is this totally impossible?
> > >
> > > You cannot control ac3 volume without having an ac3 decoder on board
> > > (assuming that your card does not have one). Maybe you can control pcm
> > > audio when using the digital out, but I don't know that audio chip.
> >
> > The AC3overDVB-Patch does generate pcm (with encapsulated ac3).
> > So it *is* maybe possible! Fine!
>
> No, you have to get the AC3 data out of the surrounding PCM stream
> used for tranport (beside a few magic samples all is zero). Any
> change of the AC3 data frame embedded in the 1536 sample PCM frame
> (6144 Bytes) would break the AC3 data frame.

Ok, accepted, thanks!
Then i can give up with this.

> Nevertheless your A/V receiver should be able to control the
> volume _after_ the builtin decoder.

Yes, shure, but that way i have 2 remote controls in my living room :-(

>         Werner

Ciao,
Andreas
-- 
Andreas Kool (akool<nospam>@</nospam>akool.de * http://www.akool.de)
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