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#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
pub struct PffftSetup {
width: usize,
work: Vec<f32>,
work_buf_offset: usize,
input: Vec<f32>,
input_buf_offset: usize,
output: Vec<f32>,
output_buf_offset: usize,
setup: *mut PFFFT_Setup,
}
fn vec_and_alignment_offset<T: Clone>(val: T, size: usize) -> (Vec<T>, usize) {
let mut work_buf = Vec::<T>::new();
work_buf.resize(size + 3, val);
let work_buf_ptr_alignment = work_buf.as_ptr() as usize % 4;
return (work_buf, (4 - work_buf_ptr_alignment) % 4);
}
impl PffftSetup {
pub fn new(width: usize) -> PffftSetup {
unsafe {
let (work_buf, work_buf_offset) = vec_and_alignment_offset(0.0f32, width);
let (input_buf, input_buf_offset) = vec_and_alignment_offset(0.0f32, width);
let (output_buf, output_buf_offset) = vec_and_alignment_offset(0.0f32, width);
PffftSetup {
width: width,
work: work_buf,
work_buf_offset: work_buf_offset,
input: input_buf,
input_buf_offset: input_buf_offset,
output: output_buf,
output_buf_offset: output_buf_offset,
setup: crate::pffft_new_setup(width as i32, crate::pffft_transform_t_PFFFT_REAL),
}
}
}
pub fn forward(&mut self, input: &[f32], output: &mut [f32]) -> bool {
if self.setup as usize == 0usize {
return false;
}
if output.len() != self.width {
return false;
}
if input.len() != self.width {
return false;
}
self.input[self.input_buf_offset..(self.input_buf_offset + self.width)]
.copy_from_slice(input);
unsafe {
crate::pffft_transform(
self.setup,
self.input[self.input_buf_offset..(self.input_buf_offset + self.width)].as_ptr(),
self.output[self.output_buf_offset..(self.output_buf_offset + self.width)]
.as_mut_ptr(),
self.work[self.work_buf_offset..(self.work_buf_offset + self.width)].as_mut_ptr(),
crate::pffft_direction_t_PFFFT_FORWARD,
)
}
output.copy_from_slice(
&self.output[self.input_buf_offset..(self.input_buf_offset + self.width)],
);
true
}
pub fn backward(&mut self, input: &[f32], output: &mut [f32]) -> bool {
if self.setup as usize == 0usize {
return false;
}
if output.len() != self.width {
return false;
}
if input.len() != self.width {
return false;
}
self.input[self.input_buf_offset..(self.input_buf_offset + self.width)]
.copy_from_slice(input);
unsafe {
crate::pffft_transform(
self.setup,
self.input[self.input_buf_offset..(self.input_buf_offset + self.width)].as_ptr(),
self.output[self.output_buf_offset..(self.output_buf_offset + self.width)]
.as_mut_ptr(),
self.work[self.work_buf_offset..(self.work_buf_offset + self.width)].as_mut_ptr(),
crate::pffft_direction_t_PFFFT_BACKWARD,
)
}
output.copy_from_slice(
&self.output[self.input_buf_offset..(self.input_buf_offset + self.width)],
);
true
}
}
impl Drop for PffftSetup {
fn drop(&mut self) {
unsafe {
if self.setup as usize != 0usize {
crate::pffft_destroy_setup(self.setup);
self.setup = 0usize as *mut PFFFT_Setup;
}
}
}
}
#[cfg(test)]
mod tests {
#[test]
fn test_unsafe() {
unsafe {
let setup = crate::pffft_new_setup(1024, crate::pffft_direction_t_PFFFT_FORWARD);
let input: [f32; 1024] = [0.0f32; 1024];
let mut output: [f32; 1024] = [0.0f32; 1024];
let mut work: [f32; 1024] = [0.0f32; 1024];
crate::pffft_transform(
setup,
&input[0],
&mut output[0],
&mut work[0],
crate::pffft_direction_t_PFFFT_FORWARD,
)
}
}
#[test]
fn test_forward_safe_no_crash() {
let mut setup = crate::PffftSetup::new(32);
let input: [f32; 32] = [0.0f32; 32];
let mut output: [f32; 32] = [0.0f32; 32];
setup.forward(&input, &mut output);
}
#[test]
fn test_backward_safe_no_crash() {
let mut setup = crate::PffftSetup::new(32);
let input: [f32; 32] = [0.0f32; 32];
let mut output: [f32; 32] = [0.0f32; 32];
setup.backward(&input, &mut output);
}
#[test]
fn test_forward_safe_dc() {
let mut setup = crate::PffftSetup::new(32);
let input: [f32; 32] = [1.0f32; 32];
let mut output: [f32; 32] = [0.0f32; 32];
setup.forward(&input, &mut output);
assert_eq!(output[0], 32f32);
for expect_zero_idx in 1..32 {
assert_eq!(output[expect_zero_idx], 0f32);
}
}
#[test]
fn test_backward_safe_dc() {
let mut setup = crate::PffftSetup::new(32);
let mut input: [f32; 32] = [0.0f32; 32];
input[0] = 1f32;
let mut output: [f32; 32] = [0.0f32; 32];
setup.backward(&input, &mut output);
for idx in 0..32 {
assert_eq!(output[idx], 1f32);
}
}
}