Module audio::audio_error

audio & MIDI: the error value both APIs return.

std/audio reports failures the way the rest of std does (no exceptions): an operation returns an AudioError — 'code' is AUDIO_OK (0) on success or one of the AUDIO_ERR_* codes below, 'message' a human-readable line for the log (the backend's own error text where it has one: ALSA's snd_strerror(), an HRESULT, a Core Audio OSStatus) — or, when it also produces a value, a std::Result<T, AudioError> (see std/result.h):

struct Result<Audio, AudioError> r = std::Audio::open(AUDIO_API_UNSPECIFIED);
match (r.get_err()) { case some(e): printf("%s\n", e.message); case null: {} }

Shared by audio.h and midi.h.