On Wed, Feb 17, 2010 at 12:56:58AM +0100, Lennart Poettering wrote:
Nah. I actually don't need this value for PulseAudio. In PulseAudio I chose to shift all scales so that maximum amplification becomes 0 dB, so that the UIs are similar to how most hifi racks do it, and which I
Interesting. The hifi equipment I've dealt with typically doesn't present any units at all in the UI outside of level monitors.
think is a nice, easy and understandable logic. That way my volume scales range from -inf dB to 0 dB in all cases, regardless of the hardware/drivers in use. Of course, that means that ALSA's own 0dB is not directly visible on the scale. Because it might be sometimes useful to know where it is, we export that position as "base volume" and the UIs show it with a little marker at the side.
Yeah, the actual zero point is definitely needed - it gives an indication of the expected output level which is very useful during setup.
I really do need to find time to dig into this code at some point - there's also the digital vs. analogue gain thing I've mentioned to you before that I wanted to look at.