[oss-devel] ossxmix patch to ignore empty mixer group

[Hannu Savolainen]

Yair K. wrote:
> On Tuesday 10 June 2008 22:41:46 Hannu Savolainen wrote:
>   
>> No changes to any of the drivers are required. The update_counter 
>> handling is done automatically by the mixer core.
>>     
>
> I didn't look at the code, but I wonder if a MIXT_GROUP control inside a MIXT_GROUP increases update_counter.
> In that case, if we have this: GROUP1->GROUP2, than GROUP2 won't be shown but GROUP1 will. Do we care about this scenario?
>   
This problem is eliminated. Update counter for GROUP1 will be zero after 
GROUP2 is added. When a control is added to GROUP1 then update counters 
of GROUP1, GROUP2, ..., DEVROOT will be incremented. So the 
update_counter field of any group will tell how many "real" controls 
there are under the group and all of its child groups (not counting any 
of the group nodes).

Apparently there are some problems with handling of the parent chain. 
The algorithm seems to think that the chain is broken so it aborts 
before reaching DEVROOT.

Best regards,

Hannu