docs.rs failed to build libkeyfinder-sys-0.1.0
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use libkeyfinder_sys::{KeyFinder, AudioData};

let mut audio = AudioData::new();
audio.set_frame_rate(44100);
audio.set_channels(2);
audio.extend(samples);

let mut kf = KeyFinder::new();
let key = kf.key_of_audio(&audio);