get an applications volume in rust

main.rs
extern crate alsa;

use alsa::{Direction, ValueOr};
use std::ffi::CString;

fn main() {
    let pcm = alsa::pcm::PCM::new("default", Direction::Playback, false).unwrap();

    // Get the mixer control for the application
    let mixer_name = CString::new("PCM").unwrap();
    let mixer_handle = alsa::mixer::Mixer::new(&mixer_name, false).unwrap();
    let mixer_elem = mixer_handle
        .find_selem(&alsa::mixer::SelemId::new("myapp", 0))
        .unwrap();

    // Get the current value of the mixer control
    let mut volume = alsa::mixer::SelemValue::new(mixer_elem.get_num_channels()).unwrap();
    mixer_elem.get_playback_volume(&mut volume).unwrap();
    let volume_percent = volume.get(0).unwrap().value().get() as u8;
    println!("Application volume: {}%", volume_percent);
}
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