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Illustrate alternative structure in beep example

This commit is contained in:
Benjamin Saunders 2020-01-21 22:36:02 -08:00
parent 076b814a15
commit 8d471f3d0e
1 changed files with 21 additions and 20 deletions
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41
examples/beep.rs
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@ -9,8 +9,22 @@ fn main() -> Result<(), anyhow::Error> {
.default_output_device() .default_output_device()
.expect("failed to find a default output device"); .expect("failed to find a default output device");
let format = device.default_output_format()?; let format = device.default_output_format()?;
let sample_rate = format.sample_rate.0 as f32;
let channels = format.channels as usize; match format.data_type {
cpal::SampleFormat::F32 => run::<f32>(&device, &format.shape())?,
cpal::SampleFormat::I16 => run::<i16>(&device, &format.shape())?,
cpal::SampleFormat::U16 => run::<u16>(&device, &format.shape())?,
}
Ok(())
}
fn run<T>(device: &cpal::Device, shape: &cpal::Shape) -> Result<(), anyhow::Error>
where
T: cpal::Sample,
{
let sample_rate = shape.sample_rate.0 as f32;
let channels = shape.channels as usize;
// Produce a sinusoid of maximum amplitude. // Produce a sinusoid of maximum amplitude.
let mut sample_clock = 0f32; let mut sample_clock = 0f32;
@ -21,24 +35,11 @@ fn main() -> Result<(), anyhow::Error> {
let err_fn = |err| eprintln!("an error occurred on stream: {}", err); let err_fn = |err| eprintln!("an error occurred on stream: {}", err);
let stream = match format.data_type { let stream = device.build_output_stream(
cpal::SampleFormat::F32 => device.build_output_stream( shape,
&format.shape(), move |data: &mut [T]| write_data(data, channels, &mut next_value),
move |data: &mut [f32]| write_data(data, channels, &mut next_value), err_fn,
err_fn, )?;
)?,
cpal::SampleFormat::I16 => device.build_output_stream(
&format.shape(),
move |data: &mut [i16]| write_data(data, channels, &mut next_value),
err_fn,
)?,
cpal::SampleFormat::U16 => device.build_output_stream(
&format.shape(),
move |data: &mut [u16]| write_data(data, channels, &mut next_value),
err_fn,
)?,
};
stream.play()?; stream.play()?;
std::thread::sleep(std::time::Duration::from_millis(1000)); std::thread::sleep(std::time::Duration::from_millis(1000));