On 14/01/18 17:13, Terry Coles wrote:
I have used both aplay -l and aplay -L, but neither help. Here is a
couple of
segments from the relevant output for the two devices:
<Start>
<First>
sysdefault:CARD=Device
USB PnP Sound Device, USB Audio
Default Audio Device
......
plughw:CARD=Device,DEV=0
USB PnP Sound Device, USB Audio
Hardware device with all software conversions
<Second>
sysdefault:CARD=Device_1
USB PnP Sound Device, USB Audio
Default Audio Device
front:CARD=Device_1,DEV=0
....
plughw:CARD=Device_1,DEV=0
USB PnP Sound Device, USB Audio
Hardware device with all software conversions
<End>
As you can see, the only difference between the two entries is the _1 after
Card=Device. That doesn't tie up with the ID Numbers in lsusb either.
Of course, if I knew the name of the device that was connected to the channel
that I wanted, then aplay -D might be useful..... :-)
The IDs in lsusb won't help, they are the vendor ID and device ID for
that type of card, not that instance in your machine.
It looks like aplay -D can use the whole device string, eg.
"plughw:CARD=Device,DEV=0" but mpg123 can't...
I've done some more experimenting and I can see how to do it... I think...
First list devices with 'aplay -l' (lowercase). On here I get this:
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: Device [USB Sound Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
There's three cards here, and each has one device.
The middle one (HDMI), is card 1, device 3. I can play through that with:
mpg123 -o alsa -a hw:1,3 /path/to/audio
Or if I want the USB device:
mpg123 -o alsa -a hw:2,0 /path/to/audio
If I wanted the internal card that would be hw:0,0, but there's nothing
plugged in to it right now... :)
--
Andrew.
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