cpal/examples/beep.rs

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Rust
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extern crate cpal;
fn main() {
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let endpoint = cpal::get_default_endpoint().unwrap();
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let format = endpoint.get_supported_formats_list().unwrap().next().unwrap();
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let mut channel = cpal::Voice::new(&endpoint, &format).unwrap();
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// Produce a sinusoid of maximum amplitude.
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let mut data_source = (0u64..).map(|t| t as f32 * 440.0 * 2.0 * 3.141592 / format.samples_rate.0 as f32) // 440 Hz
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.map(|t| t.sin());
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loop {
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match channel.append_data(32768) {
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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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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}
},
cpal::UnknownTypeBuffer::F32(mut buffer) => {
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for (sample, value) in buffer.chunks_mut(format.channels.len()).zip(&mut data_source) {
for out in sample.iter_mut() { *out = value; }
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}
},
}
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channel.play();
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}
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}