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mystic · 10-26-2021, 07:14 PM

Hello,

I'm trying to set Topping D90SE to play with mode using USB on RPi 4. Yesterday I changed rpi 3+ to rpi4 and since that i'm no longer able to play via usb. I tried many settings, many times without luck. I'm always getting somekind of error like:

Code:
Failed to open "ALSA Default" (alsa); Failed to open ALSA device "_audioout": No such file or directory

Code:
Failed to play on "ALSA Default" (alsa): snd_pcm_writei() failed: File descriptor in bad state

Code:
Failed to open "ALSA Default" (alsa); Error opening ALSA device "_audioout"; snd_pcm_hw_params() failed: Protocol error

Code:
Failed to open audio output

This is my system configuration/logs:

/var/log/mpd/log

Code:
Oct 26 20:21 : exception: Failed to play on "ALSA Default" (alsa): snd_pcm_writei() failed: File descriptor in bad state

Oct 26 20:21 : exception: Failed to open audio output

Oct 26 20:22 : player: played "SDCARD/Adele - 25 (2015) 96kHz 24 bit/01. Hello.flac"

Oct 26 20:22 : exception: Failed to play on "ALSA Default" (alsa): snd_pcm_writei() failed: File descriptor in bad state

Oct 26 20:22 : exception: Failed to open audio output

Oct 26 20:23 : player: played "SDCARD/Adele - 25 (2015) 96kHz 24 bit/01. Hello.flac"

Oct 26 20:30 : exception: Failed to play on "ALSA Default" (alsa): snd_pcm_writei() failed: File descriptor in bad state

Oct 26 20:30 : exception: Failed to open audio output

Oct 26 20:36 : player: played "SDCARD/Adele - 25 (2015) 96kHz 24 bit/01. Hello.flac"

Oct 26 20:37 : player: played "SDCARD/Adele - 25 (2015) 96kHz 24 bit/01. Hello.flac"

Oct 26 20:39 : exception: Failed to open "ALSA Default" (alsa); Error opening ALSA device "_audioout"; snd_pcm_hw_params() failed: Protocol error

Oct 26 20:39 : exception: Failed to open "ALSA Default" (alsa); Error opening ALSA device "_audioout"; snd_pcm_hw_params() failed: Protocol error

Oct 26 20:39 : player: problems opening audio device while playing "SDCARD/Adele - 25 (2015) 96kHz 24 bit/01. Hello.flac"

Oct 26 20:48 : player: played "SDCARD/Adele - 25 (2015) 96kHz 24 bit/01. Hello.flac"

Oct 26 20:54 : exception: Failed to play on "ALSA Default" (alsa): snd_pcm_writei() failed: File descriptor in bad state

Oct 26 20:54 : exception: Failed to open audio output

Oct 26 20:54 : exception: Failed to play on "ALSA Default" (alsa): snd_pcm_writei() failed: File descriptor in bad state

Oct 26 20:54 : exception: Failed to open audio output

moodeutil -l

Code:
20211026 205005 worker: -- Start

20211026 205005 worker: Successfully daemonized

20211026 205006 worker: Integrity check (passed)

20211026 205006 worker: File check (OK)

20211026 205007 worker: Session vacuumed

20211026 205007 worker: Session loaded

20211026 205007 worker: Debug logging (OFF)

20211026 205007 worker: -- Audio debug

20211026 205007 worker: ALSA cards: (0:b1 | 1:Headphones | 2:D90SE | 3:empty

20211026 205007 worker: MPD config: (2:D90SE | mixer:(Invalid card number.) | card:2)

20211026 205007 worker: ALSA mixer actual (PCM)

20211026 205007 worker: ALSA PCM volume set to (amixer: Unable to find simple control 'PCM',0)

20211026 205007 worker: -- System

20211026 205008 worker: Host     (moode)

20211026 205008 worker: moOde    (7.4.1 2021-10-02)

20211026 205008 worker: RaspiOS  (10.6)

20211026 205008 worker: Kernel   (5.4.77-v7l+ #1371)

20211026 205008 worker: Platform (Pi-4B 1.4 4GB)

20211026 205008 worker: ARM arch (armv7l, 32-bit kernel)

20211026 205008 worker: MPD ver  (0.22.11_p0x3)

20211026 205008 worker: CPU gov  (ondemand)

20211026 205008 worker: USB boot not available

20211026 205008 worker: File system expanded

20211026 205008 worker: HDMI port on

20211026 205008 worker: -- Network

20211026 205008 worker: eth0 exists

20211026 205008 worker: IP addr (192.168.0.87)

20211026 205008 worker: Netmask (255.255.255.0)

20211026 205008 worker: Gateway (192.168.0.1)

20211026 205008 worker: Pri DNS (62.179.1.61)

20211026 205008 worker: Domain  (home)

20211026 205008 worker: wlan0 does not exist

20211026 205008 worker: -- Audio config

20211026 205008 worker: MPD conf update skipped (USB device)

20211026 205008 worker: ALSA card number (2)

20211026 205009 worker: MPD audio output (D90SE)

20211026 205009 worker: Audio formats (S32_LE, SPECIAL, DSD_U32_BE)

20211026 205009 worker: ALSA mixer name (Invalid card number.)

20211026 205009 worker: MPD mixer type (software)

20211026 205009 worker: Hdwr volume controller not detected

20211026 205009 worker: ALSA output mode (Direct: hw)

20211026 205009 worker: ALSA loopback (Off)

20211026 205009 worker: Reset renderer active flags

20211026 205009 worker: CamillaDSP (off)

20211026 205009 worker: -- MPD startup

20211026 205009 worker: MPD started

20211026 205010 worker: MPD accepting connections

20211026 205010 worker: MPD output 1 ALSA Default (on)

20211026 205010 worker: MPD output 2 ALSA Bluetooth (off)

20211026 205010 worker: MPD output 3 HTTP Server (off)

20211026 205010 worker: MPD crossfade (off)

20211026 205010 worker: MPD ignore CUE files (yes)

20211026 205010 worker: -- Feature availability

20211026 205010 worker: Source select (available)

20211026 205010 worker: Source select (source: MPD)

20211026 205010 worker: Source select (output: D90SE)

20211026 205010 worker: Bluetooth (available)

20211026 205010 worker: Airplay renderer (available)

20211026 205010 worker: Spotify renderer (available)

20211026 205010 worker: Squeezelite (available)

20211026 205010 worker: RoonBridge renderer (not installed)

20211026 205010 worker: Multiroom sender (available)

20211026 205010 worker: Multiroom receiver (available)

20211026 205010 worker: UPnP renderer (available: started)

20211026 205010 worker: DLNA server (available)

20211026 205010 worker: UPnP browser (available)

20211026 205010 worker: GPIO button handler (available)

20211026 205010 worker: Stream recorder (n/a)

20211026 205010 worker: -- Music sources

20211026 205010 worker: USB sources (none attached)

20211026 205010 worker: NAS and UPnP sources (none configured)

20211026 205010 worker: -- Other

20211026 205010 worker: USB volume knob (Off)

20211026 205010 worker: USB auto-mounter (udisks-glue)

20211026 205010 worker: LED0 (On)

20211026 205010 worker: LED1 (On)

20211026 205010 worker: Saved MPD vol level (0)

20211026 205010 worker: Preamp volume level (0)

20211026 205010 worker: MPD volume level (0) restored

20211026 205010 worker: ALSA volume level (None)

20211026 205010 worker: Auto-play (Off)

20211026 205010 worker: LocalUI started

20211026 205010 worker: Maintenance interval (3 hours)

20211026 205010 worker: Screen saver activation (Never)

20211026 205010 worker: Session permissions (OK)

20211026 205010 worker: Watchdog started

20211026 205010 worker: Ready

aplay -l

Code:
**** List of PLAYBACK Hardware Devices ****

card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]

  Subdevices: 4/4

  Subdevice #0: subdevice #0

  Subdevice #1: subdevice #1

  Subdevice #2: subdevice #2

  Subdevice #3: subdevice #3

card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]

  Subdevices: 4/4

  Subdevice #0: subdevice #0

  Subdevice #1: subdevice #1

  Subdevice #2: subdevice #2

  Subdevice #3: subdevice #3

card 2: D90SE [D90SE], device 0: USB Audio [USB Audio]

  Subdevices: 1/1

  Subdevice #0: subdevice #0

sudo /var/www/command/util.sh get-mixername
empty response

alsamixer -c 2

Code:
This sound device has no controls. 

The sound device was unplugged.

From my perespective I dont have a valid mixer, I tried to use diffrent settings from moode - software, output 0db without much diffrence - maybe diffrent error ;-)
I'm sure that on RPi3 i didnt set anything special - everything was fine after chosing D90se in mpd with native option and output mode - direct, default.

Any help is appreciated.

**Tim Curtis** · 10-26-2021, 09:01 PM

With DAC connected and powered on reboot and then post output from commands below.

Code:
moodeutl -l

moodeutl -F

mystic · 10-27-2021, 08:03 AM

Hello Tim,

Output below:

moodeutl -l

Code:
20211026 212228 worker: -- Start

20211026 212228 worker: Successfully daemonized

20211026 212228 worker: Integrity check (passed)

20211026 212229 worker: File check (OK)

20211026 212229 worker: Session vacuumed

20211026 212229 worker: Session loaded

20211026 212229 worker: Debug logging (OFF)

20211026 212229 worker: -- Audio debug

20211026 212229 worker: ALSA cards: (0:b1 | 1:Headphones | 2:D90SE | 3:sndrpihifiberry

20211026 212229 worker: MPD config: (2:D90SE | mixer:(Invalid card number.) | card:2)

20211026 212229 worker: ALSA mixer actual (PCM)

20211026 212229 worker: ALSA PCM volume set to (amixer: Unable to find simple control 'PCM',0)

20211026 212229 worker: -- System

20211026 212231 worker: Host     (moode)

20211026 212231 worker: moOde    (7.4.1 2021-10-02)

20211026 212231 worker: RaspiOS  (10.6)

20211026 212231 worker: Kernel   (5.4.77-v7l+ #1371)

20211026 212231 worker: Platform (Pi-4B 1.4 4GB)

20211026 212231 worker: ARM arch (armv7l, 32-bit kernel)

20211026 212231 worker: MPD ver  (0.22.11_p0x3)

20211026 212231 worker: CPU gov  (ondemand)

20211026 212231 worker: USB boot not available

20211026 212231 worker: File system expanded

20211026 212231 worker: HDMI port on

20211026 212231 worker: -- Network

20211026 212231 worker: eth0 exists

20211026 212231 worker: IP addr (192.168.0.87)

20211026 212231 worker: Netmask (255.255.255.0)

20211026 212231 worker: Gateway (192.168.0.1)

20211026 212231 worker: Pri DNS (62.179.1.61)

20211026 212231 worker: Domain  (home)

20211026 212231 worker: wlan0 does not exist

20211026 212231 worker: -- Audio config

20211026 212231 worker: MPD conf update skipped (USB device)

20211026 212231 worker: ALSA card number (2)

20211026 212231 worker: MPD audio output (D90SE)

20211026 212231 worker: Audio formats (S32_LE, SPECIAL, DSD_U32_BE)

20211026 212231 worker: ALSA mixer name (Invalid card number.)

20211026 212231 worker: MPD mixer type (software)

20211026 212231 worker: Hdwr volume controller not detected

20211026 212231 worker: ALSA output mode (Direct: hw)

20211026 212232 worker: ALSA loopback (Off)

20211026 212232 worker: Reset renderer active flags

20211026 212232 worker: CamillaDSP (off)

20211026 212232 worker: -- MPD startup

20211026 212232 worker: MPD started

20211026 212232 worker: MPD accepting connections

20211026 212232 worker: MPD output 1 ALSA Default (on)

20211026 212232 worker: MPD output 2 ALSA Bluetooth (off)

20211026 212232 worker: MPD output 3 HTTP Server (off)

20211026 212232 worker: MPD crossfade (off)

20211026 212232 worker: MPD ignore CUE files (yes)

20211026 212232 worker: -- Feature availability

20211026 212232 worker: Source select (available)

20211026 212232 worker: Source select (source: MPD)

20211026 212232 worker: Source select (output: D90SE)

20211026 212232 worker: Bluetooth (available)

20211026 212232 worker: Airplay renderer (available)

20211026 212232 worker: Spotify renderer (available)

20211026 212232 worker: Squeezelite (available)

20211026 212232 worker: RoonBridge renderer (not installed)

20211026 212232 worker: Multiroom sender (available)

20211026 212232 worker: Multiroom receiver (available)

20211026 212232 worker: UPnP renderer (available: started)

20211026 212232 worker: DLNA server (available)

20211026 212232 worker: UPnP browser (available)

20211026 212232 worker: GPIO button handler (available)

20211026 212232 worker: Stream recorder (n/a)

20211026 212232 worker: -- Music sources

20211026 212232 worker: USB sources (none attached)

20211026 212232 worker: NAS and UPnP sources (none configured)

20211026 212232 worker: -- Other

20211026 212232 worker: USB volume knob (Off)

20211026 212232 worker: USB auto-mounter (udisks-glue)

20211026 212233 worker: LED0 (On)

20211026 212233 worker: LED1 (On)

20211026 212233 worker: Saved MPD vol level (0)

20211026 212233 worker: Preamp volume level (0)

20211026 212233 worker: MPD volume level (0) restored

20211026 212233 worker: ALSA volume level (None)

20211026 212233 worker: Auto-play (Off)

20211026 212233 worker: LocalUI started

20211026 212233 worker: Maintenance interval (3 hours)

20211026 212233 worker: Screen saver activation (Never)

20211026 212233 worker: Session permissions (OK)

20211026 212233 worker: Watchdog started

20211026 212233 worker: Ready

moodeutl -F

Code:
No device found at MPD configured card 2

Thanks

**Tim Curtis** · 10-27-2021, 10:03 AM

Some very odd results regarding card 2 which is the USB Audio device.

Try these commands after rebooting. Make sure no music is playing, all the renderers are off, UPnP off, etc so that nothing is using the audio output.

Code:
amixer -c2

sudo alsacap

mystic · 10-27-2021, 12:44 PM

amixer -c 2

Empty response (nothing returned)

sudo alsacap

Code:
*** Scanning for playback devices ***

Card 0, ID `b1', name `bcm2835 HDMI 1'

  Device 0, ID `bcm2835 HDMI 1', name `bcm2835 HDMI 1', 4 subdevices (4 available)

    1..8 channels, sampling rate 8000..192000 Hz

    Sample formats: U8, S16_LE

    Buffer size range from 80 to 131072

    Period size range from 80 to 131072

      Subdevice 0, name `subdevice #0'

      Subdevice 1, name `subdevice #1'

      Subdevice 2, name `subdevice #2'

      Subdevice 3, name `subdevice #3'

Card 1, ID `Headphones', name `bcm2835 Headphones'

  Device 0, ID `bcm2835 Headphones', name `bcm2835 Headphones', 4 subdevices (4 available)

    1..8 channels, sampling rate 8000..192000 Hz

    Sample formats: U8, S16_LE

    Buffer size range from 80 to 131072

    Period size range from 80 to 131072

      Subdevice 0, name `subdevice #0'

      Subdevice 1, name `subdevice #1'

      Subdevice 2, name `subdevice #2'

      Subdevice 3, name `subdevice #3'

Card 2, ID `D90SE', name `D90SE'

  Device 0, ID `USB Audio', name `USB Audio', 1 subdevices (1 available)

    2 channels, sampling rate 44100..768000 Hz

    Sample formats: S32_LE, SPECIAL, DSD_U32_BE

    Buffer size range from 16 to 131072

    Period size range from 8 to 65536

      Subdevice 0, name `subdevice #0'

Card 3, ID `sndrpihifiberry', name `snd_rpi_hifiberry_dacplushd'

  Device 0, ID `HiFiBerry DAC+ HD HiFi pcm179x-hifi-0', name `HiFiBerry DAC+ HD HiFi pcm179x-hifi-0', 1 subdevices (1 available)

    2 channels, sampling rate 44100..192000 Hz

    Sample formats: S16_LE, S24_LE, S32_LE

    Buffer size range from 64 to 131072

    Period size range from 32 to 65536

      Subdevice 0, name `subdevice #0'

**Tim Curtis** · 10-27-2021, 02:39 PM

Strange output.

- The command amixer -c2 should return information about the USB audio device ALSA has assigned to card 2.
- ALSA card 3 lists an I2S audio device. I don't see how this is possible.

Its not obvious to me whats going on. Maybe try a fresh 7.4.1 image and a bare Pi-4B, then plug in your USB Audio device and configure it in MPD Config.

mystic · 10-27-2021, 03:18 PM

Well, I have I2S sound card connected to PI (Hifiberry HD2 DAC), but additionally I'm connecting external DAC - Topping D90SE. Same setup was working on Pi3 without problems. I could easily switch between sound cards if needed.
I'll try to use fresh image.

**Tim Curtis** · 10-27-2021, 07:09 PM

moOde does not support switching on the fly between I2S and USB Audio devices, only between USB, HDMI and Headphones.

When an I2S audio device is configured any USB Audio device thats subsequently connected won't even show up in MPD Config to be selected.

mystic · (This post was last modified: 10-28-2021, 10:14 AM by mystic.)

Of course not on the fly. I just removed overlay with hiffibery by setting it to none, then edit MPD settings and use USB with service restart. On Pi3 it was working without issues. Today I'm gonna do a fresh install.

mystic · 11-08-2021, 11:21 AM

Hello again,

Now I have latest moode but error is the same.

moodeutl -l

Code:
pi@moode:~ $ moodeutl -l

20211108 112451 worker: -- Start

20211108 112451 worker: Successfully daemonized

20211108 112451 worker: Integrity check (passed)

20211108 112452 worker: File check (OK)

20211108 112452 worker: Session vacuumed

20211108 112452 worker: Session loaded

20211108 112452 worker: Debug logging (OFF)

20211108 112452 worker: -- Audio debug

20211108 112452 worker: ALSA cards: (0:b1 | 1:Headphones | 2:D90SE | 3:empty

20211108 112452 worker: MPD config: (2:D90SE | mixer:(Invalid card number.) | card:2)

20211108 112452 worker: ALSA mixer actual (PCM)

20211108 112452 worker: ALSA PCM volume set to (amixer: Unable to find simple control 'PCM',0)

20211108 112452 worker: -- System

20211108 112454 worker: Host     (moode)

20211108 112454 worker: moOde    (7.2.1 2021-05-06)

20211108 112454 worker: RaspiOS  (10.6)

20211108 112454 worker: Kernel   (5.4.77-v7l+ #1371)

20211108 112454 worker: Platform (Pi-4B 1.4 4GB)

20211108 112454 worker: ARM arch (armv7l, 32-bit kernel)

20211108 112454 worker: MPD ver  (0.22.6_p0x3)

20211108 112454 worker: CPU gov  (ondemand)

20211108 112454 worker: USB boot not available

20211108 112454 worker: File system expanded

20211108 112454 worker: HDMI port on

20211108 112454 worker: -- Network

20211108 112454 worker: eth0 exists

20211108 112454 worker: IP addr (192.168.0.87)

20211108 112454 worker: Netmask (255.255.255.0)

20211108 112454 worker: Gateway (192.168.0.1)

20211108 112454 worker: Pri DNS (62.179.1.61)

20211108 112454 worker: Domain  (home)

20211108 112454 moode.php: MPD connect failed: cmd=(playlist)

20211108 112454 worker: wlan0 does not exist

20211108 112454 worker: -- Audio config

20211108 112454 worker: ALSA card number (2)

20211108 112454 worker: MPD audio output (D90SE)

20211108 112454 worker: Audio formats (No device found at MPD configured card 2)

20211108 112454 worker: ALSA mixer name (Invalid card number.)

20211108 112454 worker: MPD volume control (none)

20211108 112454 worker: Hdwr volume controller exists

20211108 112454 worker: Max ALSA volume (100%)

20211108 112454 worker: ALSA loopback (Off)

20211108 112454 worker: Reset renderer active flags

20211108 112454 worker: CamillaDSP (off)

20211108 112454 worker: -- MPD startup

20211108 112454 worker: MPD started

20211108 112455 worker: MPD accepting connections

20211108 112455 worker: MPD output 1 ALSA Default (on)

20211108 112455 worker: MPD output 2 ALSA Bluetooth (off)

20211108 112455 worker: MPD output 3 HTTP Server (off)

20211108 112455 worker: MPD crossfade (off)

20211108 112455 worker: MPD ignore CUE files (yes)

20211108 112455 worker: -- Feature availability

20211108 112455 worker: Source select (available)

20211108 112455 worker: Source select (source: MPD)

20211108 112455 worker: Source select (output: D90SE)

20211108 112455 worker: Bluetooth (available)

20211108 112455 worker: Airplay renderer (available)

20211108 112455 worker: Spotify renderer (available)

20211108 112455 worker: Squeezelite (available)

20211108 112455 worker: RoonBridge renderer (not installed)

20211108 112455 worker: UPnP renderer (available)

20211108 112455 worker: DLNA server (available)

20211108 112455 worker: UPnP browser (available)

20211108 112455 worker: GPIO button handler (available)

20211108 112455 worker: Stream recorder (n/a)

20211108 112455 worker: -- Music sources

20211108 112455 worker: USB sources (none attached)

20211108 112455 worker: NAS and UPnP sources (none configured)

20211108 112455 worker: -- Other

20211108 112455 worker: USB volume knob (Off)

20211108 112455 worker: USB auto-mounter (udisks-glue)

20211108 112455 worker: LED0 (On)

20211108 112455 worker: LED1 (On)

20211108 112455 worker: Saved MPD vol level (0)

20211108 112455 worker: Preamp volume level (0)

20211108 112455 worker: MPD volume level (0) restored

20211108 112455 worker: ALSA Invalid card number. volume (amixer: Unable to find simple control 'Invalid card number.',0)

20211108 112455 worker: Auto-play (Off)

20211108 112455 worker: LocalUI started

20211108 112455 worker: Maintenance interval (3 hours)

20211108 112455 worker: Screen saver activation (Never)

20211108 112455 worker: Session permissions (OK)

20211108 112456 worker: Watchdog started

20211108 112456 worker: Ready

moodeutl -F

Code:
pi@moode:~ $ moodeutl -F

*** Scanning for playback devices ***

Card 0, ID `b1', name `bcm2835 HDMI 1'

  Device 0, ID `bcm2835 HDMI 1', name `bcm2835 HDMI 1', 4 subdevices (4 available)

    1..8 channels, sampling rate 8000..192000 Hz

    Sample formats: U8, S16_LE

    Buffer size range from 80 to 131072

    Period size range from 80 to 131072

      Subdevice 0, name `subdevice #0'

      Subdevice 1, name `subdevice #1'

      Subdevice 2, name `subdevice #2'

      Subdevice 3, name `subdevice #3'

Card 1, ID `Headphones', name `bcm2835 Headphones'

  Device 0, ID `bcm2835 Headphones', name `bcm2835 Headphones', 4 subdevices (4 available)

    1..8 channels, sampling rate 8000..192000 Hz

    Sample formats: U8, S16_LE

    Buffer size range from 80 to 131072

    Period size range from 80 to 131072

      Subdevice 0, name `subdevice #0'

      Subdevice 1, name `subdevice #1'

      Subdevice 2, name `subdevice #2'

      Subdevice 3, name `subdevice #3'

Card 2, ID `D90SE', name `D90SE'

  Device 0, ID `USB Audio', name `USB Audio', 1 subdevices (1 available)

    2 channels, sampling rate 44100..768000 Hz

    Sample formats: S32_LE, SPECIAL, DSD_U32_BE

    Buffer size range from 16 to 131072

    Period size range from 8 to 65536

      Subdevice 0, name `subdevice #0'

amixer -c 2
empty response (meaning):

Code:
pi@moode:~ $ amixer -c 2

pi@moode:~ $

alsacap

Code:
sudo alsacap

*** Scanning for playback devices ***

Card 0, ID `b1', name `bcm2835 HDMI 1'

  Device 0, ID `bcm2835 HDMI 1', name `bcm2835 HDMI 1', 4 subdevices (4 available)

    1..8 channels, sampling rate 8000..192000 Hz

    Sample formats: U8, S16_LE

    Buffer size range from 80 to 131072

    Period size range from 80 to 131072

      Subdevice 0, name `subdevice #0'

      Subdevice 1, name `subdevice #1'

      Subdevice 2, name `subdevice #2'

      Subdevice 3, name `subdevice #3'

Card 1, ID `Headphones', name `bcm2835 Headphones'

  Device 0, ID `bcm2835 Headphones', name `bcm2835 Headphones', 4 subdevices (4 available)

    1..8 channels, sampling rate 8000..192000 Hz

    Sample formats: U8, S16_LE

    Buffer size range from 80 to 131072

    Period size range from 80 to 131072

      Subdevice 0, name `subdevice #0'

      Subdevice 1, name `subdevice #1'

      Subdevice 2, name `subdevice #2'

      Subdevice 3, name `subdevice #3'

Any other hints ?

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