'Twas brillig, and David Fries at 16/10/10 04:48 did gyre and gimble: > This is what I came up with, take it or leave it. I've tweaked the wording again. Hopefully it's OK, but further patches can be made if needed. >> </option> >> <option> >> <p><opt>sync-volume-extra-delay-usec=</opt> The unit of time all HW >> volume changes are delayed. Negative values are also allowed. >> Defaults to 0.</p> >> </option> > How about "sync-volume-hw-delay-usec=" ? Then, > The unit of time all HW volume changes are delayed if the volume > changes are a constant time early. Negative values are also allowed. I don't want to change the name of the option as that will affect the other patches. Also I think if this proves to be needed then it something we'd apply on a per-hw basis which means that ultimately we'd need to build up a database of hw and the values. This information will likely come from either alsa or from udev and not be a setting you apply in the daemon.conf (which applies to all hardware you have on your machine). So I'll leave this as it is for now. > On Fri, Oct 15, 2010 at 10:22:16AM +0200, Paul Menzel wrote: >> I am still thinking that a ???normal??? users does not have a clue on how to >> determine to what value these options should be set. So it should be >> marked as expert value or something or a hint should be given on how one >> can determine what values should be used. I think any values entered would be mostly trial and error anyway. > A program could measure the hardware mixer latency by playing a square > wave on one stream and adjusting the volume of another stream playing > silence. Then adjust the parameters so that the wave doesn't vary as > the volume changes. Too bad sound cards don't have the internal > analog loopback control anymore, now you would need to externally loop > the audio back. I think "normal" users wont know how to use "man ..." :p Yes this could be useful. If anyone writes such a tool, then we can certainly reference it here. Col -- Colin Guthrie gmane(at)colin.guthr.ie http://colin.guthr.ie/ Day Job: Tribalogic Limited [http://www.tribalogic.net/] Open Source: Mageia Contributor [http://www.mageia.org/] PulseAudio Hacker [http://www.pulseaudio.org/] Trac Hacker [http://trac.edgewall.org/]
