Re: [Alsa-user] getting device name for playback

[Dennis B. <den...@go...>]

Hello alsa-users!

I found out, how to get to know the device names. It can be done by
parsing the output of alsactl store. Every device, that is capable of
output, has got a negative or 0-value of dbmax.

Best regards,
Dennis

Dennis Borgmann schrieb:
> Hello alsa-users!
>
> I would like to extract the info, which device is for playback on a
> sound device. For example, I have a headset, which gives back this info:
>
> :~# amixer -c 0 scontrols
> Simple mixer control 'Mic',0
> Simple mixer control 'Auto Gain Control',0
> Simple mixer control 'Speaker',0
>
> and for another card plugged to the very same system:
>
> :~# amixer -c 1 scontrols
> Simple mixer control 'PCM',0
>
> So there is one card having only one channel for playback (device named
> "PCM" here) and then there is the headset, which has a "Speaker", an
> "Auto Gain Control" and a microphone("Mic"). I want to adjust volumes of
> "Speaker" and "PCM".
>
> To extract "PCM" of the soundcard can be done easily, since there is
> only one device. But take the card with the headset - how can I
> distinguish, which card if meant for playback? If I have a look at it
> with humanoid intuition, it is easy. But if I want to let this be parsed
> in a script - what to do? This card has got three devices.
>
> Any ideas?
>
> Best regards,
> Dennis
>