Audio level control?

[rhaleblian]

I didn't see any. I'll blow my speakers out at some point... 🔈 !!!

[rhaleblian]

There's normalization code that's defeated. It sets the volume based on SDL_MIX_MAXVOLUME.
SD_VOLUME is set to 50% but isn't used anywhere.
I would opt for using

void SDL_MixAudio(Uint8*       dst,
                  const Uint8* src,
                  Uint32       len,
                  int          volume)

which would require changing the audio callback to pass buffers as bytes, not shorts.

[rhaleblian]

https://github.com/rhaleblian/linapple-pie/tree/volume
re-exposes "Speaker Volume" in the conf. This code stopped exiting cleanly though (double-free).