[oss-devel] mixer API question about rec buttons (bug in SNDCTL_MIX_WRITE?)

[Yair K.]

Hi,

  Most mixers contain "rec" buttons which let the user select recording 
source. Some mixers let multiple recording sources be selected. 

A. When setting the on/off value with SNDCTL_MIX_WRITE on a rec button, 
val.value is always returned as 1. Shouldn't it be 0 or 1 according to 
whether the source is selected?

B. ossmix uses val.value = -1 to toggle the value of the button. But
http://manuals.opensound.com/developer/MIXT_ONOFF.html says only 0 or 1 are 
accepted values. I guess the doc is incomplete?

(Why am I asking this? There's a bug in ossxmix where if only one rec source 
is enabled and the user unselects it, the button become unchecked, but the 
source is still selected. I tried to check what value SNDCTL_MIX_WRITE 
returned in set_value, and discovered A. above)

Yours,
	Yair K.