r8brain-rs

rust interface to the r8brain free resampler: https://github.com/avaneev/r8brain-free-src

Sample rate converter designed by Aleksey Vaneev of Voxengo

Example usage

use r8brain_rs::{PrecisionProfile, Resampler};

fn test() {
    let mut resampler = Resampler::new(48000.0, 96000.0, 4096, 2.0, PrecisionProfile::Bits24);

    let input = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0];
    let mut output = [0.0; 128];
    let output_len = resampler.process(&input, &mut output);
    let resampled = &output[..output_len];

    // do not be alarmed if you have to call .process() many times
    // before a non-empty slice is yielded. This is normal.
}

Performance

On Macbook Pro M1, single threaded:

test tests::benchmarks::resample_192k_to_44dot1k_24bit ... bench:       2,084 ns/iter (+/- 14) = 80 MB/s
test tests::benchmarks::resample_44dot1k_to_192k_24bit ... bench:      10,025 ns/iter (+/- 386) = 16 MB/s
test tests::benchmarks::resample_48k_to_192k_24bit     ... bench:       2,727 ns/iter (+/- 24) = 61 MB/s
test tests::benchmarks::resample_48k_to_96k_16bit      ... bench:       1,460 ns/iter (+/- 35) = 115 MB/s
test tests::benchmarks::resample_48k_to_96k_24bit      ... bench:       1,705 ns/iter (+/- 40) = 98 MB/s
test tests::benchmarks::resample_96k_to_48k_16bit      ... bench:         674 ns/iter (+/- 6) = 249 MB/s