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

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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:

<snip>
$ 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
</snip>

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
<snip>
$ pgrep pulse
$
</snip>

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:
<snip>
pcm.jack {
    type jack
    playback_ports {
        0
        1
    }
    capture_ports {
        0
        1
    }
    hint {
      description "use jack as alsa-device"
    }
}
</snip>

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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Received on Mon Oct 28 20:15:06 2013