[pulseaudio-discuss] Alsa's mixer interface with pulseaudio plugin

Lennart Poettering lennart at poettering.net
Wed Jul 30 07:03:32 PDT 2008

On Tue, 29.07.08 10:52, Wolfgang Rosenauer (wolfgang at rosenauer.org) wrote:

> Hi,
> I'm just trying to implement a volume control using the Alsa mixer API.
> That works already with plain ALSA but not if PA is used.
> When using plain Alsa I'm getting the PCM mixer to work while with PA I 
> found there is only a Master mixer available which I can get but the 
> volume get functions are returning strange values.
> I'm using
>    snd_mixer_selem_get_playback_dB_range()
>    snd_mixer_selem_get_playback_dB()
> The range looks suspicious (1-140576480) but the reported volume is 0 
> what makes no sense.
> So do I need to do something different for PA or won't it work anyway?

AFAIR ioplug devices don't support dB scales. Sorry. Patches welcome.


Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4

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