From: ts <decoux@...>
Date: 2008-03-28T00:54:49+09:00
Subject: Re: accessing mixer values

ruud wrote:
> I want to read the volume of the mixer device with a ruby script.
> Can anybody tell me what the ruby equivalent is of what the MIXER_READ
> macro does in C?

 I'm sure that you'll happy to know that, on linux, MIXER_READ(dev) do
 this

 (((2U) << (((0 +8)+8)+14)) | ((('M')) << (0 +8)) | (((dev)) << 0) |
 (((((sizeof(int) == sizeof(int[1]) && sizeof(int) < (1 << 14)) ?
 sizeof(int) : __invalid_size_argument_for_IOC))) << ((0 +8)+8)))


 :-)

> I've been googling with keywords like 'ioctl, MIXER_READ SOUND_MIXER',
> but with little result. Hopefully someone can me push me in the right
> direction...

 perhaps best if you use Ruby::Inline to access it

 http://rubyforge.org/projects/rubyinline/


Guy Decoux