Hi,
I'm aware that in FreeBSD 8+ there is the VPC (Volume Per Channel)
feature which allows separate programs to have separate sound volumes.
But suppose there is a (bad) program that does not let me control its
volume from within its interface.
Is there a way for me to control it at the OS level?
In other words, I'm trying to perform these steps:
Given the program X:
1) Find out what channel(s) X is using
2) Forcibly modify the VPC settings for those channels
Is it possible?
I realize there are probably issues where if X opens/closes new
channels on the fly it might be hard to keep track of, but is the
underlying support even there?
I imagine if I can open the appropriate device, I can use the
SNDCTL_DSP_SETPLAYVOL ioctl. But how do I open the appropriate device?
Thanks
-John
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