4.14's openal update causes muffled sound effect

[kevansevans]

Link to github issue: https://github.com/ZDoom/gzdoom/issues/2865

Video showcasing the discrepancy: https://www.dropbox.com/scl/fi/hz8rsqkf ... 4wl8a&dl=0

This does not happen in 4.13, and if you replace the openal32.dll found in 4.14 with the one in 4.13, the issue goes away.

[phantombeta]

The "Default" audio resampler option seems to default to "4-Point Gaussian" now instead of "Linear" as it previously did.

[Chris]

The "Default" audio resampler option seems to default to "4-Point Gaussian" now instead of "Linear" as it previously did.

The previous resampler (since OpenAL Soft 1.23) was Cubic Spline, before that it was Linear. OpenAL Soft 1.24 added a new 4-Point Gaussian resampler and made it the default. There will likely be a 1.24.2 release soon that changes the default back to Cubic Spline since many people find it too distracting, particularly with low sample rate sounds. In the mean time, GZDoom does have an option to change the resampler so you can set it back to Cubic Spline or Linear (or Nearest, or one of the Sinc options), whichever you like best and your CPU is fast enough for.

[Rachael]

I generally like to ship the newest OpenAL's on every release, but if it's necessary for GZDoom to change its CVAR default for the resampler request so that OpenAL can maintain a separate default for other projects that is doable, but probably not preferable.

I have it set to nearest in both my GZDoom and Raze config, so I didn't even notice the problem when it was first reported, but then I listened to Kev's video showing the change and it was very obvious and I have to say it did sound worse.