Re: Digital bit perfect ouptut with ALSA

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On Friday 12 December 2008 17:31:43 Bill Unruh wrote:
> On Fri, 12 Dec 2008, Paulo Moura Guedes wrote:
> > On Thursday 11 December 2008 01:42:12 Bill Unruh wrote:
> >> On Wed, 10 Dec 2008, stan wrote:
> >>> Paulo Moura Guedes wrote:
> >>>> I'm trying to get bit perfect output out of my linux box, but I can't
> >>
> >> What is "bit perfect output"? Sound output is an analog process ( sound
> >> waves in the air are analog). You do know that you can just copy the
> >> sound file whereever you want.
> >
> > "bit perfect output" is to pass the digital signal as it is, i.e.,
> > without transforming it. You know, I'm using an external DAC to decode
> > the digital signal into analog.
>
> You mean out of a SPDIF output? Or what is your soundcard? Why can you not
> simply transfer the digital file?


My DAC supports USB. I'm using digital output via USB.


> >>>> - is it possible to set the bit-depth? (in my case to 24 bit)
> >>>
> >>> yes, but your card has to support it. Most new cards have
> >>> internal processing larger than 24 bits
> >
> > It does.
>
> What is your card?


My card is an Intel ICH6.


> What do you want the output to be?


Since the DAC supports 24bit ouput, that's what I would like to have.
I thought that the sound card was being bypassed in this case.


> > How can I set it?
>
> Depends on the software you use to play the file.


I'm using amarok which is using xine engine which is using ALSA.


Paulo

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