Playing music

First, add the mp3 module:

mod mp3;

Copy the src/mp3.rs file from the previous chapter.

We also need the following dependencies:

[dependencies]
crossbeam = "^0.3.0"
futures = "^0.1.16"
pulse-simple = "^1.0.0"
simplemad = "^0.8.1"

And add these statements to the main module:

extern crate crossbeam;
extern crate futures;
extern crate pulse_simple;
extern crate simplemad;

We'll now add a player module:

mod player;

This new module will start with a bunch of import statements:

use std::cell::Cell;
use std::fs::File;
use std::io::BufReader;
use std::path::{Path, PathBuf};
use std::sync::{Arc, Condvar, Mutex};
use std::thread;
use std::time::Duration;

use crossbeam::sync::SegQueue;
use futures::{AsyncSink, Sink};
use futures::sync::mpsc::UnboundedSender;
use pulse_simple::Playback;

use mp3::Mp3Decoder;
use playlist::PlayerMsg::{
    self,
    PlayerPlay,
    PlayerStop,
    PlayerTime,
};
use self::Action::*;

We imported a new PlayerMsg type from the playlist module, so let's add it:

#[derive...