126 lines
3.7 KiB
Rust
126 lines
3.7 KiB
Rust
// Copyright (c) 2021 Weird Constructor <weirdconstructor@gmail.com>
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// This file is a part of HexoDSP. Released under GPL-3.0-or-later.
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// See README.md and COPYING for details.
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use crate::dsp::SAtom;
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use hound;
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use std::collections::HashMap;
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#[derive(Debug)]
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pub enum SampleLoadError {
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LoadError(hound::Error),
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UnsupportedFormat,
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}
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impl From<hound::Error> for SampleLoadError {
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fn from(err: hound::Error) -> Self {
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SampleLoadError::LoadError(err)
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}
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}
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const MAX_SAMPLE_LEN_S: usize = 60; // 60 seconds of audio is about 20MB
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/// Loads and stores samples, for use as SAtom parameters for
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/// nodes.
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pub struct SampleLibrary {
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loaded_samples: HashMap<String, SAtom>,
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max_length_s: usize,
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}
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impl SampleLibrary {
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pub fn new() -> Self {
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Self { loaded_samples: HashMap::new(), max_length_s: MAX_SAMPLE_LEN_S }
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}
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/// Synchronous/blocking loading of a sample from `path`.
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/// Returns an SAtom reference that you can clone and send directly
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/// to the sampling node of your choice.
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///
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/// Keep in mind that blocking on I/O in the UI might not be desireable.
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pub fn load<'a>(&'a mut self, path: &str) -> Result<&'a SAtom, SampleLoadError> {
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if self.loaded_samples.get(path).is_some() {
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return Ok(self.loaded_samples.get(path).unwrap());
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}
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let mut rd = match hound::WavReader::open(path) {
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Err(e) => return Err(SampleLoadError::LoadError(e)),
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Ok(rd) => rd,
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};
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let channels = rd.spec().channels as usize;
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let mut v = vec![rd.spec().sample_rate as f32];
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let max_sample_count = self.max_length_s * rd.spec().sample_rate as usize;
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match rd.spec().sample_format {
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hound::SampleFormat::Float => {
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for s in rd.samples::<f32>().step_by(channels).take(max_sample_count) {
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v.push(s?);
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}
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}
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// http://blog.bjornroche.com/2009/12/int-float-int-its-jungle-out-there.html
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hound::SampleFormat::Int => {
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for s in rd.samples::<i16>().step_by(channels).take(max_sample_count) {
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let s = s?;
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let s = s as f32 / (0x8000 as f32);
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v.push(s);
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}
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}
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};
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let atom = SAtom::audio(path, std::sync::Arc::new(v));
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self.loaded_samples.insert(path.to_string(), atom);
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Ok(self.loaded_samples.get(path).unwrap())
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}
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}
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impl Default for SampleLibrary {
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fn default() -> Self {
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Self::new()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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fn save_wav(name: &str, buf: &[f32]) {
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let spec = hound::WavSpec {
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channels: 1,
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sample_rate: 44100,
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bits_per_sample: 16,
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sample_format: hound::SampleFormat::Int,
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};
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let mut writer = hound::WavWriter::create(name, spec).unwrap();
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for s in buf.iter() {
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let amp = i16::MAX as f32;
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writer.write_sample((amp * s) as i16).unwrap();
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}
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}
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#[test]
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fn check_sample_lib() {
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let mut sl = SampleLibrary::new();
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save_wav("check_sample_lib_test.wav", &[0.1, -1.0, 1.0, -0.1]);
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let sat = sl.load("check_sample_lib_test.wav").unwrap();
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//d// println!("sa: {:?}", sat);
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if let SAtom::AudioSample((_n, Some(v))) = sat {
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assert_eq!(v[0], 44100.0);
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assert_eq!((v[1] * 1000.0).round() as i32, 100);
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assert_eq!((v[2] * 1000.0).round() as i32, -1000);
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assert_eq!((v[3] * 1000.0).round() as i32, 1000);
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assert_eq!((v[4] * 1000.0).round() as i32, -100);
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} else {
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assert!(false);
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}
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}
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}
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