[MPlayer-users] What output driver for USB DAC?

[John Long]

On Sun, 2018-02-04 at 11:59 +0100, Erik Auerswald wrote:
> Hi John,
> 
> On 02/04/2018 09:32 AM, John Long wrote:
> > Does anybody know how to get mplayer to send the correct signal to
> > a
> > USB DAC?
> 
> I've never done this and don't have that kind of device, so I cannot 
> give you a definitive answer.

Thank you for the suggestions! I feel I am on the right track.

It is weird, but when I get the card address correct I get a message
that the hardware doesn't support s16le. I looked at the passthrough
sections and I think this is what I want, but it does not work.

I'll keep looking into this, thanks!

I did see which output options are available but I couldn't figure out
how to use them. I don't know where the doc is for all those (not in
the mplayer man page) and I figured somebody else must be doing this
already, I am a late technology adopter. Everybody is usually a few
generations of gadgets ahead of me.

/jl

> 
> Anyway, I used to have a Hi-Fi DAC connected via S/PDIF fibre optics 
> cable. I could use this with the MPlayer option:
> 
>      -ao alsa:device=iec958=1.0
> 
> You can look at the documentation for "passthrough":
> 
> http://mplayerhq.hu/DOCS/HTML/en/advaudio-surround.html#advaudio-surr
> ound-passthrough
> 
> http://mplayerhq.hu/DOCS/HTML/en/advaudio-surround.html#hwmpa-surroun
> d-passthrough
> 
> You can get a list of audio outputs supported by you MPlayer
> executable 
> using:
> 
>      mplayer -ao help
> 
> > If I play the file normally (mplayer filename) it appears mplayer
> > decodes the file before sending it to the DAC.
> 
> Yes, that is the MPlayer default behaviour, you need to explicitly
> stop 
> MPlayer from decoding and tell it to send the digital data to the
> device 
> if you want to override this default.
> 
> > I am trying to get
> > mplayer to send whatever type of signal to the DAC it needs so that
> > the
> > DAC itself will decode the music, not mplayer.
> 
> I hope that the documentation pointers above help you getting closer
> to 
> that.
> 
> Thanks,
> Erik
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