Re: [alsa-devel] alsa-lib: snd_mixer_selem_is_active changes - which event?

2011/2/16 Sebastian H. vand2@gmx.de

Hello

I wonder which event mask notifies an application that snd_mixer_selem_is_active() may have changed.

SND_CTL_EVENT_MASK_VALUE or SND_CTL_EVENT_MASK_INFO

or something else?

I'd be glad for any insights?

qasmixer display the following message when play audio through front device of emu10k1

alsa_callback_hctl_elem: Unknown mask ( 3 ) [EE] snd_hctl_handle_events : Operation not permitted

which event mask "SND_CTL_EVENT_MASK_VALUE" or "SND_CTL_EVENT_MASK_VALUE " should the mixer application handle first ?

e.g. it is possible that the driver may change access of the control

& ~SNDRV_CTL_ELEM_ACCESS_READ