lookas 1.10.0

Perception aligned terminal-based audio spectrum visualizer
Documentation 
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use anyhow::{Context, Result};
use cpal::traits::{DeviceTrait, HostTrait};
use cpal::{
    Device, SampleRate, SupportedStreamConfig,
    SupportedStreamConfigRange,
};

const PREFERRED_INPUT_SAMPLE_RATES: [SampleRate; 2] =
    [SampleRate(48_000), SampleRate(44_100)];

pub fn pick_input_device() -> Result<Device> {
    cpal::default_host()
        .default_input_device()
        .context("No default input device")
}

pub fn best_config_for(
    device: &Device,
) -> Result<SupportedStreamConfig> {
    let default = device.default_input_config()?;
    let default_format = default.sample_format();

    let ranges = device
        .supported_input_configs()?
        .filter(|range| range.sample_format() == default_format)
        .collect::<Vec<_>>();

    for sample_rate in PREFERRED_INPUT_SAMPLE_RATES {
        if let Some(config) = config_with_rate(&ranges, sample_rate) {
            return Ok(config);
        }
    }

    Ok(default)
}

fn config_with_rate(
    ranges: &[SupportedStreamConfigRange],
    sample_rate: SampleRate,
) -> Option<SupportedStreamConfig> {
    ranges
        .iter()
        .find_map(|&range| range.try_with_sample_rate(sample_rate))
}