cpal/examples/enumerate.rs

extern crate cpal;
extern crate failure;

fn main() -> Result<(), failure::Error> {
    let default_in = cpal::default_input_device().map(|e| e.name().unwrap());
    let default_out = cpal::default_output_device().map(|e| e.name().unwrap());
    println!("Default Input Device:\n  {:?}", default_in);
    println!("Default Output Device:\n  {:?}", default_out);

    let devices = cpal::devices()?;
    println!("Devices: ");
    for (device_index, device) in devices.enumerate() {
        println!("{}. \"{}\"", device_index + 1, device.name()?);

        // Input formats
        if let Ok(fmt) = device.default_input_format() {
            println!("  Default input stream format:\n    {:?}", fmt);
        }
        let mut input_formats = match device.supported_input_formats() {
            Ok(f) => f.peekable(),
            Err(e) => {
                println!("Error: {:?}", e);
                continue;
            },
        };
        if input_formats.peek().is_some() {
            println!("  All supported input stream formats:");
            for (format_index, format) in input_formats.enumerate() {
                println!("    {}.{}. {:?}", device_index + 1, format_index + 1, format);
            }
        }

        // Output formats
        if let Ok(fmt) = device.default_output_format() {
            println!("  Default output stream format:\n    {:?}", fmt);
        }
        let mut output_formats = match device.supported_output_formats() {
            Ok(f) => f.peekable(),
            Err(e) => {
                println!("Error: {:?}", e);
                continue;
            },
        };
        if output_formats.peek().is_some() {
            println!("  All supported output stream formats:");
            for (format_index, format) in output_formats.enumerate() {
                println!("    {}.{}. {:?}", device_index + 1, format_index + 1, format);
            }
        }
    }

    Ok(())
}