[pulseaudio-discuss] Matrix creator one - using the alsa virtual device as an input

[billt at willandnora.com]

I'm needing help to configure pulse audio to read from the mic array
on the Matrix Creator One,

The following are the lists of devices, what creates the devices in
/tmp here is the source that does it

https://github.com/matrix-io/matrix-creator-malos/blob/1a09b776c5c762093a42b286457f06823ec46d78/src/driver_micarray_alsa.cpp
[1]

Essentially I can't get the mic_channel0-8 to input into Pulse Audio.
Input 8 is a combined microphone input with beam forming done on the
FPGA chip.

	PI at MATRIXRPI3
:
~ $
 arecord -l

	**** List of CAPTURE Hardware Devices ****

	card 1: Dummy [Dummy], device 0: Dummy PCM [Dummy PCM]

	  Subdevices: 7/8

	  Subdevice #0: subdevice #0

	  Subdevice #1: subdevice #1

	  Subdevice #2: subdevice #2

	  Subdevice #3: subdevice #3

	  Subdevice #4: subdevice #4

	  Subdevice #5: subdevice #5

	  Subdevice #6: subdevice #6

	  Subdevice #7: subdevice #7

	PI at MATRIXRPI3
:
~ $
 arecord -L

	null

	    Discard all samples (playback) or generate zero samples
(capture)

	sc

	mic_channel0

	mic_channel1

	mic_channel2

	mic_channel3

	mic_channel4

	mic_channel5

	mic_channel6

	mic_channel7

	mic_channel8

	default

	    Playback/recording through the PulseAudio sound server

	snooped_digital

	sysdefault:CARD=Dummy

	    Dummy, Dummy PCM

	    Default Audio Device

	dmix:CARD=Dummy,DEV=0

	    Dummy, Dummy PCM

	    Direct sample mixing device

	dsnoop:CARD=Dummy,DEV=0

	    Dummy, Dummy PCM

	    Direct sample snooping device

	hw:CARD=Dummy,DEV=0

	    Dummy, Dummy PCM

	    Direct hardware device without any conversions

	plughw:CARD=Dummy,DEV=0

	    Dummy, Dummy PCM

	    Hardware device with all software conversions

	PI at MATRIXRPI3
:
~ $



Links:
------
[1]
https://github.com/matrix-io/matrix-creator-malos/blob/1a09b776c5c762093a42b286457f06823ec46d78/src/driver_micarray_alsa.cpp

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