102 lines
3.6 KiB
Rust
102 lines
3.6 KiB
Rust
use anyhow::{bail, Result};
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use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
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use itertools::Itertools;
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use rubato::{FftFixedInOut, Resampler};
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pub struct Audio {
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#[allow(unused)]
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stream: cpal::Stream,
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sampler: FftFixedInOut<f32>,
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input_buffer: Vec<Vec<f32>>,
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output_buffer: Vec<Vec<f32>>,
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sample_sink: rtrb::Producer<f32>,
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}
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impl Audio {
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pub fn init() -> Result<Self> {
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let host = cpal::default_host();
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let Some(device) = host.default_output_device() else {
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bail!("No output device available");
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};
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let Some(config) = device
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.supported_output_configs()?
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.find(|c| c.channels() == 2 && c.sample_format().is_float())
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else {
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bail!("No suitable output config available");
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};
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let mut config = config.with_max_sample_rate().config();
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let sampler = FftFixedInOut::new(41700, config.sample_rate.0 as usize, 834, 2)?;
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config.buffer_size = cpal::BufferSize::Fixed(sampler.output_frames_max() as u32);
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let input_buffer = sampler.input_buffer_allocate(true);
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let output_buffer = sampler.output_buffer_allocate(true);
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let (sample_sink, mut sample_source) =
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rtrb::RingBuffer::new(sampler.output_frames_max() * 4);
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let stream = device.build_output_stream(
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&config,
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move |data: &mut [f32], _| {
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let requested = data.len();
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let chunk = match sample_source.read_chunk(data.len()) {
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Ok(c) => c,
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Err(rtrb::chunks::ChunkError::TooFewSlots(n)) => {
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sample_source.read_chunk(n).unwrap()
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}
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};
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let len = chunk.len();
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let (first, second) = chunk.as_slices();
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data[0..first.len()].copy_from_slice(first);
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data[first.len()..len].copy_from_slice(second);
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for rest in &mut data[len..requested] {
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*rest = 0.0;
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}
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chunk.commit_all();
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},
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move |err| eprintln!("stream error: {err}"),
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None,
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)?;
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stream.play()?;
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Ok(Self {
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stream,
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sampler,
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input_buffer,
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output_buffer,
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sample_sink,
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})
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}
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pub fn update(&mut self, samples: &[f32]) {
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for sample in samples.chunks_exact(2) {
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for (channel, value) in self.input_buffer.iter_mut().zip(sample) {
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channel.push(*value);
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}
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if self.input_buffer[0].len() >= self.sampler.input_frames_next() {
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let (_, output_samples) = self
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.sampler
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.process_into_buffer(&self.input_buffer, &mut self.output_buffer, None)
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.unwrap();
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let chunk = match self.sample_sink.write_chunk_uninit(output_samples * 2) {
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Ok(c) => c,
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Err(rtrb::chunks::ChunkError::TooFewSlots(n)) => {
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self.sample_sink.write_chunk_uninit(n).unwrap()
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}
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};
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let interleaved = self.output_buffer[0]
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.iter()
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.interleave(self.output_buffer[1].iter())
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.cloned();
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chunk.fill_from_iter(interleaved);
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for channel in &mut self.input_buffer {
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channel.clear();
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}
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}
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}
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while self.sample_sink.slots() < self.sampler.output_frames_max() * 2 {
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std::hint::spin_loop();
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}
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}
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}
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