[pulseaudio-discuss] Audio cards with subdevices

[Daniel Mack]

In my test environment, I have a card with two subdevices.
It lists as follows using 'aplay -l':

card 0: DJ [Audio 4 DJ], device 0: Audio 4 DJ [Audio 4 DJ]
  Subdevices: 1/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1

pulseaudio, however, is only aware of the first subdevice. This is the
only ALSA sink 'pulseaudio -v' tells me about on startup:

: sink.c: Created sink 0 "alsa_output.0" with sample spec s24be 2ch 44100Hz and channel map front-left,front-right
I: sink.c:     alsa.resolution_bits = "24"
I: sink.c:     device.api = "alsa"
I: sink.c:     device.class = "sound"
I: sink.c:     alsa.class = "generic"
I: sink.c:     alsa.subclass = "generic-mix"
I: sink.c:     alsa.name = "Audio 4 DJ"
I: sink.c:     alsa.id = "Audio 4 DJ"
I: sink.c:     alsa.subdevice = "0"
I: sink.c:     alsa.subdevice_name = "subdevice #0"
I: sink.c:     alsa.device = "0"
I: sink.c:     alsa.card = "0"
I: sink.c:     alsa.card_name = "Audio 4 DJ"
I: sink.c:     alsa.long_card_name = "Native Instruments Audio 4 DJ (serial SN-XXXXXXXXXXXXX, usb-0000:00:02.1-2)"
I: sink.c:     device.string = "hw:0"
I: sink.c:     device.buffering.buffer_size = "131070"
I: sink.c:     device.buffering.fragment_size = "131070"
I: sink.c:     device.access_mode = "mmap+timer"
I: sink.c:     device.profile.name = "analog-stereo"
I: sink.c:     device.profile.description = "Analog Stereo"
I: sink.c:     device.description = "Audio 4 DJ"
I: sink.c:     device.icon_name = "audio-card-analog"

Connecting multiple cards of the same kind works well, though Sorry if
that has been dicussed before, I could find any hint in the archives.

Thanks,
Daniel