62 lines
2.0 KiB
Rust
62 lines
2.0 KiB
Rust
extern crate cpal;
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extern crate futures;
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use futures::stream::Stream;
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use futures::task;
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use futures::task::Executor;
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use futures::task::Run;
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use std::sync::Arc;
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struct MyExecutor;
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impl Executor for MyExecutor {
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fn execute(&self, r: Run) {
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r.run();
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}
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}
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fn main() {
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let endpoint = cpal::get_default_endpoint().expect("Failed to get default endpoint");
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let format = endpoint.get_supported_formats_list().unwrap().next().expect("Failed to get endpoint format");
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let event_loop = cpal::EventLoop::new();
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let executor = Arc::new(MyExecutor);
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let (mut voice, stream) = cpal::Voice::new(&endpoint, &format, &event_loop).expect("Failed to create a voice");
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// Produce a sinusoid of maximum amplitude.
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let samples_rate = format.samples_rate.0 as f32;
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let mut data_source = (0u64..).map(move |t| t as f32 * 440.0 * 2.0 * 3.141592 / samples_rate) // 440 Hz
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.map(move |t| t.sin());
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voice.play();
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task::spawn(stream.for_each(move |buffer| -> Result<_, ()> {
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match buffer {
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cpal::UnknownTypeBuffer::U16(mut buffer) => {
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for (sample, value) in buffer.chunks_mut(format.channels.len()).zip(&mut data_source) {
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let value = ((value * 0.5 + 0.5) * std::u16::MAX as f32) as u16;
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for out in sample.iter_mut() { *out = value; }
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}
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},
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cpal::UnknownTypeBuffer::I16(mut buffer) => {
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for (sample, value) in buffer.chunks_mut(format.channels.len()).zip(&mut data_source) {
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let value = (value * std::i16::MAX as f32) as i16;
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for out in sample.iter_mut() { *out = value; }
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}
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},
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cpal::UnknownTypeBuffer::F32(mut buffer) => {
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for (sample, value) in buffer.chunks_mut(format.channels.len()).zip(&mut data_source) {
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for out in sample.iter_mut() { *out = value; }
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}
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},
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};
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Ok(())
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})).execute(executor);
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event_loop.run();
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}
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