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use model::Model;
use signal::Signal;
use pitch::Pitch;
use std::os::raw::c_char;
use std::os::raw::c_void;
use std::mem;
use std::ffi::CString;
use std::slice;
use std::f32;
#[no_mangle]
pub extern "C" fn malloc(size: usize) -> *mut c_void {
let mut buf = Vec::with_capacity(size);
let ptr = buf.as_mut_ptr();
mem::forget(buf);
return ptr as *mut c_void;
}
#[no_mangle]
pub extern "C" fn free(ptr: *mut c_void, cap: usize) {
unsafe {
// after it's in scope, it can go out of scope in the normal
// RAII cleanup.
let _buf = Vec::from_raw_parts(ptr, 0, cap);
}
}
#[no_mangle]
pub extern "C" fn free_str(ptr: *mut c_char) {
unsafe {
let _ = CString::from_raw(ptr);
}
}
#[no_mangle]
pub extern "C" fn find_fundamental_frequency(signal_ptr: *const f32, signal_length: isize, sample_rate: f32) -> f32 {
let signal_slice = unsafe {
&slice::from_raw_parts(signal_ptr, signal_length as usize)
};
let signal = Signal::new(signal_slice, sample_rate);
let model = Model::from_signal(signal);
model.pitch.map_or(f32::NAN, |p| p.hz)
}
#[no_mangle]
pub extern "C" fn hz_to_cents_error(hz: f32) -> f32 {
let pitch = Pitch::new(hz);
pitch.cents_error()
}
#[no_mangle]
pub extern "C" fn hz_to_pitch(hz: f32) -> *mut c_char {
let pitch = Pitch::new(hz);
CString::new(format!("{}", pitch))
.unwrap()
.into_raw()
}
#[no_mangle]
pub extern "C" fn correlation(signal_ptr: *mut f32, signal_length: isize, sample_rate: f32) {
let signal_slice = unsafe {
&slice::from_raw_parts(signal_ptr, signal_length as usize)
};
let signal = Signal::new(signal_slice, sample_rate);
let model = Model::from_signal(signal);
unsafe {
for (i, cor) in model.correlation.value.iter().enumerate() {
*signal_ptr.offset(i as isize) = *cor;
}
}
}
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