[vdr] Re: mpeg1 layer 2 (mp2) -> iec958 ?

[Sven Goethel <sgoethel@jausoft.com>]

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On Tuesday 14 October 2003 13:57, Dr. Werner Fink wrote:
> On Tue, Oct 14, 2003 at 12:49:16PM +0200, Sven Goethel wrote:
> > On Tuesday 14 October 2003 11:45, Dr. Werner Fink wrote:
> > > Nevertheless it should be possible to embed mp2 audio
> > > frames within an PCM frames each representing the length
> > > the duration of the included mp2 frame.
> > > This for all
> > > DVB cards which do not have a S/P-DIF out ... or sound cards
> > > which lost the S/P-DIF in pin due to the vendors `kindness'.
> >
> > yep .. a victim of the "kindness" of the vendors of a msi 845gl ..
>
> Does this box really have only one S/P-DIF connector even
> one the external side?  And is the CDROM only connected
> analog to the onboard sound chip?

so .. since your S/P-DIF "loop through" is "just" for sync
and no pcm audio is avaiable due to the not set "none audio" 
bit if the AV711x.. i guess its senseless ..

but what do you mean about the audio connection of the cdrom ?
what benefits should i have with that ?

the msi's connectors for the 
	Card: Intel 82801DB-ICH4
	Chip: Realtek ALC650 rev 1
are:
	- internal cdrom/dvd aux (line) in's
	- line in
	- line out
	- mic in / line out
	- S/P-DIF

so i might have to fiddle out how to use a line/aux in as
as S/P-DIF input .. ?!?!

>
> > btw: if you use "loop through" iec958,
> > how does the decoded mp2 signal reaches you SPDIF out ?
> > is it plain PCM ?
>
> The data out of the S/P-DIF of the DVB card is linear PCM
> stereo with 16bit@48kHz.  Beside this the PCM to S/P-DIF
> encoder of the AV7110 or AV7111 is not able to set the
> the status bit of the second 32bit transport word ... in
> other words, it is not possible to mark the 16 bit data
> therein as none audio.

what a pitty .. may be this can be fixed with a driver patch ?

>
> > > And the question is: Are all A/V receivers and amplifiers
> > > out there able to detect mp2 and switch on _automatically_
> > > the mp2 decoder.
> >
> > das true
> >
> > but if your loop through solution works for decoded mp2,
> > therefor plain PCM .. we may can pass software decoded mp2
> > as plain PCM as well ?!?!
>
> Should be possible ... in that case a fully software decoder
> lib for mp2 is required.  Then the question about the license
> and/or patents rises :-((
>
>        Werner

hmm ..

anybody out there, who knows about a possible mp2 decoder patent conflict ?

cheers, sven
- -- 
health & wealth
mailto:sgoethel@jausoft.com
www   : http://www.jausoft.com ; pgp: http://www.jausoft.com/gpg/
voice : +49-5121-999600 ; fax : +49-5121-999602
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