Re: Digital bit perfect ouptut with ALSA

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On Thursday 11 December 2008 01:20:23 stan wrote:
> Paulo Moura Guedes wrote:
> > I'm trying to get bit perfect output out of my linux box, but I can't
> > find much
> > info on the web. I'm using ALSA.
> >
> >
> > Some questions:
> >
> >
> > - does Linux/ALSA features dynamic sample rates?
>
> yes. You can specify whatever rate you want and it will
> happen. eg 57,325 frames/second.


I meant "dynamic", e.g., if my FLAC file has a sample rate of 96KHz, that will be used, but if next I play a 44.1KHz file it would dynamicaly changes to 44.1.
>
> > - 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


I have a Benchmark DAC1 which supports 24 bit.
Were can I set the bit-depth?


> > - what other variables do i have to consider in order to get bit
> > transparent ouput,
> > i.e., no resampling at all?
>
> Use only hardware rates supported by your card.


You mean sample-rates?


> You can
> ensure this by using plughw as your device instead of
> default. That converts from the audio application sound
> format to the sound card internal format, but does no
> resampling. You can avoid even the conversion if you make
> sure the audio is in the format that your sound device uses
> internally.


Can you elaborate?


Thanks,
Paulo

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