Having sorted out my previous problem with Jack, I've got round to
trying to sort out the multi-channel outputs
via a MiniDSP UDAC-8. This is an 8-channel USB output device. I plugged
it in and it shows up with 'aplay -':
---------------------------------
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC887-VD Digital [ALC887-VD Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: UDAC8 [U-DAC8], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
------------------------------
Going into QjackCtl and changing the output device to hw:UDAC8 and it
seems to work - jack restarts and the Graph
window now shows system with 8 playback channels. I then tried using
jack-play to play a short test .wav file
which works fine on the ALC877 but fails with the UDAC-8:
------------------------------------------
Cannot read socket fd = 8 err = Success
Cannot open jack-play-3712 client
CheckRes error
JackSocketClientChannel read fail
JackShmReadWritePtr1::~JackShmReadWritePtr1 - Init not done for -1,
skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,
skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,
skipping unlock
jack_client_open() failed: jack-play-3712
-------------------------------------------
I then tried using just alsa
aplay -D plughw:UDAC8
which works, while
aplay -D hw:UDAC8
fails with:
------------------------------
Playing WAVE 'test1.wav' : Signed 16 bit Little Endian, Rate 48000 Hz,
Stereo
aplay: set_params:1349: Channels count non available
------------------------------
qjackctl only allows devices with hw:* and not plughw:* so that could be
something, though I don't
understand the internals of jack and alsa.
Anyone able to set me right and get this to work will win my undying
gratitude!
Bill
--
+----------------------------------------+
| Bill Purvis |
| email: bill@xxxxxxxxx |
+----------------------------------------+
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