Jim Lesurf said:
In article ,
Richard Robinson wrote:

The DAC has a little row of lights showing the incoming sample rate. I
just set something playing and had a look ... none of them are lit up.
Helpful, no ? :-/

Afraid I've forgotten what kind of DAC you're using, so can only guess.

I think I probably didn't mention it ?

However it is possible that the DAC is fussy about the rate. So if the
playout is running too fast or too slow (or is too erratic) the LED doesn't
light up.

You can read a 'file' for each device and - when audio is playing - the
relevant one will state the rate, etc, being sent out to hardware. My
memory being what it is I can't immediately recall the 'file' names for
this. But if no-one else can say I'll find out and let you know later on.
[ Edit: see below :-) ]

Thanks, yes

$ cat /proc/asound/C1/pcm0p/sub0/hw_params
access: RW_INTERLEAVED
format: S24_3LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 5513
buffer_size: 22050


If you're using -aplay you can use this to probe what works

get a list of devices from 'aplay -l'

then try 'aplay -D hw:one of them file.wav' to see if that will
play the file and give you a coconut. Using 'hw:' tells -aplay
to *not* provide any conversions. So it will only play when the
device can accept the rate and bit-depth of the wave file.

I'm confused about the names :-
aplay -l gives
card 1: C1 [Cambridge Audio DAC100 USB 1], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
but none of the obvious (to me, anyway) names from that produce anything
audible. What should I be using for a name ?




--
Richard Robinson
"The whole plan hinged upon the natural curiosity of potatoes" - S. Lem

My email address is at http://www.qualmograph.org.uk/contact.html