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use transforms;
use std::os::raw::c_char;
use std::ffi::CString;
use std::slice;
#[no_mangle]
pub extern "C" fn find_fundamental_frequency(signal: *const f32, signal_length: isize, sample_rate: f32) -> f32 {
let signal_slice = unsafe {
&slice::from_raw_parts(signal, signal_length as usize)
};
transforms::find_fundamental_frequency(&signal_slice, sample_rate).unwrap_or(0.0)
}
#[no_mangle]
pub extern "C" fn hz_to_cents_error(hz: f32) -> f32 {
transforms::hz_to_cents_error(hz)
}
#[no_mangle]
pub extern "C" fn hz_to_pitch(hz: f32) -> *mut c_char {
let pitch = transforms::hz_to_pitch(hz);
CString::new(pitch)
.unwrap()
.into_raw()
}
#[no_mangle]
pub extern "C" fn correlation(signal: *mut f32, signal_length: isize) {
let signal_slice = unsafe {
&slice::from_raw_parts(signal, signal_length as usize)
};
let correlated_signal = transforms::correlation(&signal_slice);
unsafe {
for (i, cor) in correlated_signal.iter().enumerate() {
*signal.offset(i as isize) = *cor;
}
}
}
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