At Sun, 23 Nov 2003 20:23:11 +0100, Christian Esken wrote: > > Hello, > > I have problems with snd_mixer_selem_get_capture_switch(elem,pos,&value) > in my KMix mixer application. The "value" returned does *not* reflect the > actual state in all cases. > Probably I am doing something wrong, if somebody could throw me a hint I would > be more than happy. I have investigated for days and feel completely lost. > > It is a bit complicated, so I'll do a step-by-step walkthrough of an example: > > 1) Initially switch "1" is ON and switch "2" is OFF > 2) I enable switch "2". > 3) The ALSA driver detects that switches "1" and "2" cannot be ON at > the same time. So the ALSA driver disables "1". > 4a) KMix now shows switches "1" and "2" both as ON, because > snd_mixer_selem_get_capture_switch() reports them as ON. > 4b) alsamixer shows switch "1" is OFF and switch "2" is ON. > > So I wonder why snd_mixer_selem_get_capture_switch() works in alsamixer and > not in KMix. > The only differenece I see is that alsamixer has these poll-descriptor stuff > in it. Do I possibly need to implement it (I don't understand what I would > have to do there - it looks complicated)?
yes, otherwise the update won't occur. in the case of qt, you can do polling via connecting QSocketNotifier. > Or is there some other means to > "update" the state of the mixer elements? it's not so easy, since you'll need to receive the information which element should be updated at each time when a change occurs. otherwise you'll have to update all elements at once. Takashi ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
