On Sun, 2010-10-10 at 13:03 +0100, Colin Guthrie wrote: > 'Twas brillig, and Arun Raghavan at 10/10/10 11:30 did gyre and gimble: > > On Sun, 2010-10-10 at 10:46 +0100, Colin Guthrie wrote: > > [...] > >> I'd also like to expose a new constant in the headers called > >> PA_VOLUME_OVERDRIVE (or similarly named) that represents +11dB and > >> should be our generally recommended "overdrive" (aka software > >> amplification > 100%) amount for volume control UIs. > >> > >> Currently gnome-volume-control allows up to PA_VOLUME_NORM*1.5 which is > >> ~= +11dB via current mappings, which is one reason why we previously > >> decided on +11dB as our overdrive amount. That said, other volume > >> control UIs (pavucontrol, kmix and, surprisingly, > >> gnome-volume-control-applet) only allow volumes up to PA_VOLUME_NORM, so > >> the idea would be to allow them to go right up to PA_VOLUME_OVERDRIVE, > >> and hopefully implement an appropriate use of colours and markers etc. > >> to make it clear to the user that they may not want to go >100% or risk > >> clipping. > >> > >> http://pulseaudio.org/wiki/WritingVolumeControlUIs#Colouredvolumesliders > > > > Sounds reasonable. Although, independent of the rest of these changes, > > I'd also like to propose that the max. s/w gain (i.e. PA_VOLUME_MAX) be > > decreased from its current value (~289 dB now, ~271 dB with my change) > > to something more reasonable, like ~20 dB. > > > > I came to this conclusion the hard way - while testing these patches, I > > managed to turn up the volume high enough to temporarily damage my > > hearing (it was a sudden burst, and I got to the off switch in time, so > > no permanent damage done, I hope). > > Urk! I'll try and type quietly... :D > > I understand that some overdrive is useful in general, but are there any > > objections to capping the max. to something like ~20 dB? > > I think that imposing a more sensible limit probably makes sense. I > can't think of any practical reasons to push things to dB's > 20 ish so > on the whole I'd be in favour of a more sensible upper limit. > > Quite what that limit should be however is perhaps debatable so other > opinions should maybe be canvassed to get the final 20dB upper limit. Right, I'm pretty open to any sane limit - just want to establish what that limit is. :) Cheers, Arun
