如何以编程方式设置系统响度（在OSX和Windows上）

Question

I want to manipulate the system loudness (the global volume, or whatever it is called) from within my program. This might seem ridiculous, but I need to do some measurements, so I am interested in not only attenuating the sound via an internal loudness, but also amplify it, which is only possible using the system loudness. Since I am using Qt, a C++-solution would be greatly appreciated.

Would anyone know how to do this on either Windows or OSX? (Cross-platform development, you see...)

Thank you in advance!

Answer 1

Check out this post. CocoaDev: SoundVolume

Answer 2

One possibility on OSX is to use a terminal command:

#include <cstdlib>
system("osascript -e \"set Volume 5\"\n");

(Of course, you may change ' 5 ' to whatever you like; The range seems to be between 0 and about 7.5 (?))

Admittedly, this is not a pretty solution and I am still interested in a better one, but at least it works, although at a hefty performance cost while executing the command.