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use cpal::traits::DeviceTrait;
use cpal::traits::HostTrait;
use cpal::{OutputCallbackInfo, Sample, SampleFormat, SampleRate, Stream, StreamConfig};
use std::collections::VecDeque;
use std::sync::Arc;
use std::sync::Mutex;
pub struct Audio {
pub output_buffer: Arc<Mutex<VecDeque<f32>>>, //TODO ring buffer?
pub output_config: StreamConfig,
pub output_stream: Stream,
}
impl Audio {
pub fn new() -> Self {
let output_buffer = Arc::new(Mutex::new(VecDeque::new()));
let host = cpal::default_host();
let device = host
.default_output_device()
.expect("default output device not found");
let mut supported_configs_range = device
.supported_output_configs()
.expect("error querying configs");
let supported_config = supported_configs_range
.next()
.expect("no supported config??")
.with_sample_rate(SampleRate(48000));
let supported_sample_format = supported_config.sample_format();
let config: StreamConfig = supported_config.into();
let err_fn = |err| eprintln!("an error occurred on the output audio stream: {}", err);
let stream_audio_buf = Arc::clone(&output_buffer);
let stream = match supported_sample_format {
SampleFormat::F32 => {
device.build_output_stream(&config, curry_callback::<f32>(stream_audio_buf), err_fn)
}
SampleFormat::I16 => {
device.build_output_stream(&config, curry_callback::<i16>(stream_audio_buf), err_fn)
}
SampleFormat::U16 => {
device.build_output_stream(&config, curry_callback::<u16>(stream_audio_buf), err_fn)
}
}
.unwrap();
Self {
output_buffer,
output_config: config,
output_stream: stream,
}
}
}
fn curry_callback<T: Sample>(
buf: Arc<Mutex<VecDeque<f32>>>,
) -> impl FnMut(&mut [T], &OutputCallbackInfo) + Send + 'static {
move |data: &mut [T], _info: &OutputCallbackInfo| {
let mut lock = buf.lock().unwrap();
for sample in data.iter_mut() {
*sample = Sample::from(&lock.pop_front().unwrap_or(0.0));
}
}
}
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