Higher-quality WAV support for GLQuake

[JasonX]

Haven't seen anything about audio improvements, only graphics. Anyone seen any tuts?

[Baker]

See JoeQuake source code, look for COM_CheckParm("-44Hz") or some such thing in one of the snd_???.c files. I'm thinking it is in Snd_Init.

[mh]

Beware though that Quake's source audio files are low quality. With digital audio once you remove something it's gone forever. You can't get it back. Quake itself has a fairly crude resampling function but when going to a higher frequency all this does is pitch-shift the audio. This isn't higher quality, it's just higher frequency but the quality is actually significantly worse as it throws out all of the low frequencies that give sound it's presence and impact.

[Spike]

blindly increasing the frequency by just making the samples wider is not going to help sound quality, especially if you use non-integer rate multipliers.
hardware that moves speakers to match the current sample will not sound good when it moves faster than it ought, and then stops for a while, basically.

having said that, some of the sounds were recorded at a rate of 22khz and are still in that format, so you can get a slight improvement on quality on those sounds, but only those sounds when played at 22khz.

DP has a linear resampling routine which can give better quality sound when resampled.

Anything more complicated (say, 4/6 speakers) requires more work.
Using openal or something instead requires a heck of a lot of work. Such features do not make simple/useful tutorials.
Having said that, I have some voice chat code lying around which is self-contained enough to be easy to port, except for actually playing it. :)

[leileilol]

snd_dos.c has a -sspeed cvar the other snd_*'s don't have