83 lines
2.9 KiB
Rust
83 lines
2.9 KiB
Rust
#![allow(dead_code)]
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extern crate anyhow;
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extern crate cpal;
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use cpal::{
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traits::{DeviceTrait, HostTrait, StreamTrait},
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SizedSample,
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};
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use cpal::{FromSample, Sample};
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#[cfg_attr(target_os = "android", ndk_glue::main(backtrace = "full"))]
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fn main() {
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let host = cpal::default_host();
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let device = host
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.default_output_device()
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.expect("failed to find output device");
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let config = device.default_output_config().unwrap();
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match config.sample_format() {
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cpal::SampleFormat::I8 => run::<i8>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::I16 => run::<i16>(&device, &config.into()).unwrap(),
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// cpal::SampleFormat::I24 => run::<I24>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::I32 => run::<i32>(&device, &config.into()).unwrap(),
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// cpal::SampleFormat::I48 => run::<I48>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::I64 => run::<i64>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::U8 => run::<u8>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::U16 => run::<u16>(&device, &config.into()).unwrap(),
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// cpal::SampleFormat::U24 => run::<U24>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::U32 => run::<u32>(&device, &config.into()).unwrap(),
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// cpal::SampleFormat::U48 => run::<U48>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::U64 => run::<u64>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::F32 => run::<f32>(&device, &config.into()).unwrap(),
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cpal::SampleFormat::F64 => run::<f64>(&device, &config.into()).unwrap(),
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sample_format => panic!("Unsupported sample format '{sample_format}'"),
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}
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}
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fn run<T>(device: &cpal::Device, config: &cpal::StreamConfig) -> Result<(), anyhow::Error>
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where
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T: SizedSample + FromSample<f32>,
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{
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let sample_rate = config.sample_rate.0 as f32;
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let channels = config.channels as usize;
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// Produce a sinusoid of maximum amplitude.
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let mut sample_clock = 0f32;
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let mut next_value = move || {
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sample_clock = (sample_clock + 1.0) % sample_rate;
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(sample_clock * 440.0 * 2.0 * std::f32::consts::PI / sample_rate).sin()
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};
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let err_fn = |err| eprintln!("an error occurred on stream: {}", err);
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let stream = device.build_output_stream(
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config,
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move |data: &mut [T], _: &cpal::OutputCallbackInfo| {
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write_data(data, channels, &mut next_value)
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},
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err_fn,
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None,
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)?;
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stream.play()?;
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std::thread::sleep(std::time::Duration::from_millis(1000));
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Ok(())
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}
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fn write_data<T>(output: &mut [T], channels: usize, next_sample: &mut dyn FnMut() -> f32)
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where
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T: Sample + FromSample<f32>,
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{
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for frame in output.chunks_mut(channels) {
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let value: T = T::from_sample(next_sample());
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for sample in frame.iter_mut() {
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*sample = value;
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}
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}
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}
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