Re: What output driver for USB DAC?

On Sat, 2018-02-24 at 16:12 +0100, Reimar Döffinger wrote:
> On Sun, Feb 04, 2018 at 11:06:53AM +0000, John Long wrote:
> > On Sun, 2018-02-04 at 10:39 +0000, Andy Furniss wrote:
> > > John Long wrote:
> > > > Does anybody know how to get mplayer to send the correct signal
> > > > to
> > > > a
> > > > USB DAC?
> > > > 
> > > > If I play the file normally (mplayer filename) it appears
> > > > mplayer
> > > > decodes the file before sending it to the DAC. 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.
> > > 
> > > If it's a DAC then it won't decode the many types of compressed
> > > audio 
> > > that mplayer/ffmpeg can.
> > 
> > That's ok, it supports everything I need it to play which is DSD
> > and
> > FLAC.
> 
> I have some severe doubts about that.
> For it to support FLAC, the playback application would need
> to passthrough FLAC.

And this is what happens. Sorry for not being very clear.

It's not just a DAC. It's a streaming music player that supports DLNA,
FLAC and a bunch of other CODECs over DLNA, and over USB.

It also has a USB DAC. Mplayer doesn't seem to get along with it but I
am pretty sure it's not mplayer itself but some piece of Linux
middleware. Which is how this question started.

> Which means someone needs to standardize a way to signal
> that FLAC is supported for passthrough AND specify a passthrough
> format.
> Considering how rare FLAC is, I really don't think anyone
> has done that.

FLAC is the most popular non-lossy music format. Relatively, it is not
rare.

/jl

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