extern crate samplerate;
extern crate hound;
use samplerate::{Samplerate, ConverterType};
use hound::{WavSpec, WavWriter, SampleFormat};
fn main() {
let freq_left = std::f32::consts::PI * 880f32 / 44100f32;
let freq_right = std::f32::consts::PI * 1200f32 / 44100f32;
let input_left = (0..44100 * 10).map(|i| (freq_left * i as f32).sin());
let input_right = (0..44100 * 10).map(|i| (freq_right * i as f32).sin());
let input: Vec<f32> = input_left.zip(input_right).map(|(l, r)| vec![l, r]).flatten().collect();
let converter = Samplerate::new(ConverterType::SincBestQuality, 44100, 48000, 2).unwrap();
let mut writer_48000 = WavWriter::create("sine-48000.wav", WavSpec {
channels: 2,
sample_rate: 48000,
bits_per_sample: 32,
sample_format: SampleFormat::Float,
}).unwrap();
let chunk_size = 4410; for i in 0..input.len() / chunk_size {
let resampled = converter.process(&input[i * chunk_size .. (i + 1) * chunk_size]).unwrap();
resampled.iter().for_each(|i| writer_48000.write_sample(*i).unwrap());
}
}