From: Reco <recovery...@enotuniq.net>
Date: Fri, 30 Jul 2021 19:37:49 +0300
> Aha. So, will this work?
> aplay -d dmix:CARD=Set,DEV=0 /usr/share/sounds/alsa/Noise.wav
peter@joule:/home/peter$ aplay -d dmix:CARD=Set,DEV=0
/usr/share/sounds/alsa/Noise.wav
aplay: main:653: invalid duration argument 'dmix:CARD=Set,DEV=0'
peter@joule:/home/peter$ aplay -D dmix:CARD=Set,DEV=0
/usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian,
Rate 48000 Hz, Mono
aplay: set_params:1345: Channels count non available
peter@joule:/home/peter$ aplay -D dmix:CARD=Set,DEV=0 -c 1
/usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian,
Rate 48000 Hz, Mono
aplay: set_params:1345: Channels count non available
No sound. Channels (or channels) has me stumped for now.
> Or this:
> aplay -D plughw:CARD=Set,DEV=0 /usr/share/sounds/alsa/Noise.wav
Gives the noise. Good. I guess hw = hardware. No explanation of
plughw in the aplay manual but google found a few remarks.
Conclusion for users who want sound and don't care about channels: try plughw.
> And likewise:
> aplay -D dmix:CARD=U0x46d0x807,DEV=0 /usr/share/sounds/alsa/noise.wav
> aplay -D plughw:CARD=U0x46d0x807,DEV=0 /usr/share/sounds/alsa/noise.wav
peter@joule:/home/peter$ aplay -D dmix:CARD=U0x46d0x807,DEV=0
/usr/share/sounds/alsa/noise.wav
ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave
aplay: main:828: audio open error: No such file or directory
peter@joule:/home/peter$ aplay -D plughw:CARD=U0x46d0x807,DEV=0
/usr/share/sounds/alsa/noise.wav
aplay: main:828: audio open error: No such file or directory
main:828? What is that?
> I'm unsure what should "usbstream:CARD=Set" do, but try it as well.
peter@joule:/home/peter$ aplay -D usbstream:CARD=Set
/usr/share/sounds/alsa/Noise.wav
ALSA lib pcm_usb_stream.c:508:(_snd_pcm_usb_stream_open) Unknown field hint
aplay: main:828: audio open error: Invalid argument
These three give noise.
peter@joule:/home/peter$ aplay -D default:CARD=ICH5
/usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian,
Rate 48000 Hz, Mono
peter@joule:/home/peter$ aplay -D sysdefault:CARD=ICH5
/usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian,
Rate 48000 Hz, Mono
peter@joule:/home/peter$ aplay -D surround21:CARD=ICH5,DEV=0
/usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian,
Rate 48000 Hz, Mono
peter@joule:/home/peter$ aplay -D front:CARD=ICH5,DEV=0
/usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian,
Rate 48000 Hz, Mono
The "front" device gives silence. A cable inside the box is not
connected to the system board? Will check when there is time.
Try a voice message.
peter@joule:/home/peter$ aplay -D plughw:CARD=ICH5,DEV=0 m94.WAV
aplay: test_wavefile:1054: can't play WAVE-file format 0x0031 which is not PCM
or FLOAT encoded
So try play. It lacks the -D parameter. Two commands required. =8~(
peter@joule:/home/peter$ set AUDIODEV=plughw:CARD=ICH5,DEV=0; play m94.WAV
play WARN alsa: can't encode 0-bit Unknown or not applicable
In spite of the warning, sound is produced. Good! Might have a
reliable way to hear voice messages.
CONCLUSIONS
Audio messages can be interpreted. Eg.,
set AUDIODEV=plughw:CARD=ICH5,DEV=0; play m94.WAV
"aplay -L" reported approximately 61 devices. A few hours of trial
and error (and note writing) got sound from four. Terrible odds.
(Computing is so much more productive when based upon reason rather
than guesswork.)
The best alsa documentation I've found in debian.org is
https://wiki.debian.org/ALSA . In my view, the first sentence should
direct the reader to learn basics at
https://alsa-project.org/wiki/Main_Page . Even so crucial gaps are
obvious. What exactly is a channel? A reader should be wary of any
document containing undefined terms.
Thanks for the help, ... P.
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