audio-visualizer 0.5.0

Simple audio visualization library which is especially useful for developers to visually check audio samples, e.g. by waveform or spectrum. (So far) this library is not capable of doing nice visualizations for end users.
Documentation 
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use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
use cpal::{BufferSize, SampleRate, StreamConfig};
use std::thread::sleep;
use std::time::Duration;

/// Small binary to test audio input across platforms (windows, mac, linux) in a fast way.
fn main() {
    for host in cpal::available_hosts() {
        println!("Host={:?}, input devices:", host);
        for dev in cpal::host_from_id(host).unwrap().input_devices().unwrap() {
            println!(
                "  {} - Supported input configs:",
                dev.name()
                    .as_ref()
                    .map(|s| s.as_str())
                    .unwrap_or("<unknown>"),
            );

            for cfg in dev.supported_input_configs().unwrap() {
                println!("    {:#?}", cfg);
            }
        }
    }

    let default_in = cpal::default_host().default_input_device().unwrap();
    let stream = default_in
        .build_input_stream::<f32, _, _>(
            &StreamConfig {
                channels: 2,
                sample_rate: SampleRate(48000),
                buffer_size: BufferSize::Default,
            },
            |data, _x| {
                println!("got data: {} samples", data.len());
            },
            |_e| {},
            None,
        )
        .unwrap();
    stream.play().unwrap();
    sleep(Duration::from_secs(5));
    stream.pause().unwrap();
}