OpenAL capturing is broken.

[TannerRogalsky]

warning: unresolved symbol: alcCaptureSamples
warning: unresolved symbol: alGetFloat
warning: unresolved symbol: alcCaptureStart
warning: unresolved symbol: alcCaptureStop

Emscripten links in its own OpenAL port. I haven't checked if these functions are unsupported or just missing from the version Emscripten provides.

[kripken]

Those don't appear to be in Emscripten's OpenAL support.

If they are crucial you can file a bug on Emscripten and we'll look into feasibility (some APIs can't be done on the web due to WebAudio limitations).

[bartbes]

LÖVE doesn't actually do any audio capturing at the moment (see issue 1 on our issue tracker).