[LAD] list all ALSA-devices (including virtual ones)

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To: The Linux Audio Developers' Mailing List <linux-audio-dev@...>
Date: Monday, October 28, 2013 - 4:55 pm

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hi all,

what's the proper way to list all alsa-devices, including those
(plugin, slave,...) defined in asoundrc?

e.g. on my desktop i have

$ cat ~/.asoundrc
pcm.jack {
type jack
playback_ports {
0
1
}
capture_ports {
0
1
}
}
$ cat /proc/asound/cards
0 [MID ]: HDA-Intel - HDA Intel MID
HDA Intel MID at 0xf4ff8000 irq 42
1 [Bt878 ]: Bt87x - Brooktree Bt878
Brooktree Bt878 at 0xf3fff000, irq 17

but aplay will show me:

$ LANG=C aplay -L -l
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
sysdefault:CARD=MID
HDA Intel MID, VT1828S Analog
Default Audio Device
front:CARD=MID,DEV=0
HDA Intel MID, VT1828S Analog
Front speakers
surround40:CARD=MID,DEV=0
HDA Intel MID, VT1828S Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=MID,DEV=0
HDA Intel MID, VT1828S Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=MID,DEV=0
HDA Intel MID, VT1828S Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=MID,DEV=0
HDA Intel MID, VT1828S Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=MID,DEV=0
HDA Intel MID, VT1828S Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=MID,DEV=0
HDA Intel MID, VT1828S Digital
HDMI Audio Output
**** List of PLAYBACK Hardware Devices ****
card 0: MID [HDA Intel MID], device 0: VT1828S Analog [VT1828S Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: MID [HDA Intel MID], device 2: VT1828S Alt Analog [VT1828S Alt
Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: MID [HDA Intel MID], device 3: VT1828S Digital [VT1828S Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0

there is no mention of my 'jack' pcm, *and* there are devices that i
don't know where they come from: namely 'null' and 'pulse' (pulseaudio
is installed but not running, as confirmed by

$ pgrep pulse
$

so i figure that the extra devices come from system-configuration
files in /usr/share/alsa/alsa.conf(.d/*.conf)

but why does my "jack" PCM not show up?
i know that i can extend my asoundrc to:

pcm.jack {
type jack
playback_ports {
0
1
}
capture_ports {
0
1
}
hint {
description "use jack as alsa-device"
}
}

but i don't fully understand why i have to manually add the "hint" (of
which i haven't found *any* documentation) in order to make the device
show up with

char**hints=NULL;
snd_device_name_hint(-1, "pcm", (void***)&hints);

any clues?

fgasmdr
IOhannes
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