microdsp 0.1.3

DSP algorithms and utilities. Performant, embedded friendly and no_std compatible.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

use core::convert::TryInto;

/// Perform an in-place fast Fourier transform on real valued data.
/// Input buffer length must be a power of 2.
pub fn real_fft(buffer: &mut [f32]) -> &mut [microfft::Complex32] {
    let fft_size = buffer.len();
    match fft_size {
        8 => microfft::real::rfft_8(buffer.try_into().unwrap()),
        16 => microfft::real::rfft_16(buffer.try_into().unwrap()),
        32 => microfft::real::rfft_32(buffer.try_into().unwrap()),
        64 => microfft::real::rfft_64(buffer.try_into().unwrap()),
        128 => microfft::real::rfft_128(buffer.try_into().unwrap()),
        256 => microfft::real::rfft_256(buffer.try_into().unwrap()),
        512 => microfft::real::rfft_512(buffer.try_into().unwrap()),
        1024 => microfft::real::rfft_1024(buffer.try_into().unwrap()),
        2048 => microfft::real::rfft_2048(buffer.try_into().unwrap()),
        4096 => microfft::real::rfft_4096(buffer.try_into().unwrap()),
        _ => panic!("Unsupported fft size {}", fft_size),
    }
}