cpal/examples/enumerate.rs

extern crate cpal;
extern crate failure;

use cpal::traits::{DeviceTrait, HostTrait};

fn main() -> Result<(), failure::Error> {
    println!("Supported hosts:\n  {:?}", cpal::ALL_HOSTS);
    let available_hosts = cpal::available_hosts();
    println!("Available hosts:\n  {:?}", available_hosts);

    for host_id in available_hosts {
        println!("{:?}", host_id);
        let host = cpal::host_from_id(host_id)?;
        let default_in = host.default_input_device().map(|e| e.name().unwrap());
        let default_out = host.default_output_device().map(|e| e.name().unwrap());
        println!("  Default Input Device:\n    {:?}", default_in);
        println!("  Default Output Device:\n    {:?}", default_out);

        let devices = host.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(())
}