cpal/examples/music.rs

extern crate cpal;
extern crate vorbis;

use std::io::BufReader;

fn main() {
    let mut channel = cpal::Channel::new();

    let mut decoder = vorbis::Decoder::new(BufReader::new(include_bin!("mozart_symfony_40.ogg")))
        .unwrap();

    'main: for packet in decoder.packets() {
        let packet = packet.unwrap();
        let vorbis::Packet { channels, rate, data, .. } = packet;

        let mut data = data.as_slice();

        loop {
            if data.len() == 0 {
                continue 'main;
            }

            let mut buffer = channel.append_data(channels, cpal::SamplesRate(rate as u32), data.len());
            let mut buffer = buffer.iter_mut();

            loop {
                let next_sample = match data.get(0) {
                    Some(s) => *s,
                    None => continue 'main
                };

                if let Some(output) = buffer.next() {
                    *output = next_sample as u16;
                    data = data.slice_from(1);
                } else {
                    break;
                }
            }
        }
    }
}