♻️ refactor: extract DecoderThread and clean up identifiers

src/main.rs

@@ -102,7 +102,7 @@ pub struct SharedState {
 	pub quit: bool,
 }
 
-fn cmd_gui (args: &[String]) -> Result <()> {
+fn cmd_gui (_args: &[String]) -> Result <()> {
 	let (fltk_tx, fltk_rx) = app::channel::<Message> ();
 	
 	let app = app::App::default ();
@@ -151,12 +151,41 @@ fn cmd_play (args: &[String]) -> Result <()> {
 	.map (|s| s.to_string ())
 	.collect ();
 	
-	let pair = Arc::new ((Mutex::new (SharedState::default ()), Condvar::new ()));
-	let pair2 = Arc::clone (&pair);
-	let pair3 = Arc::clone (&pair);
+	let shared_state = Arc::new ((Mutex::new (SharedState::default ()), Condvar::new ()));
+	let pcm_quit = Arc::new ((Mutex::new (false), Condvar::new ()));
 	
-	let thread_decoder = thread::spawn (move|| {
-		let (lock, cvar) = &*pair2;
+	let thread_decoder = DecoderThread::new (Arc::clone (&shared_state), filenames);
+	let audio_output = AudioOutput::new (Arc::clone (&pcm_quit), Arc::clone (&shared_state))?;
+	
+	tracing::debug! ("Joining decoder thread...");
+	
+	thread_decoder.join ()?;
+	
+	tracing::debug! ("Joining PCM thread...");
+	
+	let (lock, cvar) = &*pcm_quit;
+	let _ = cvar.wait (lock.lock ().unwrap ()).unwrap ();
+	
+	drop (audio_output);
+	
+	sleep (Duration::from_secs (1));
+	
+	tracing::info! ("Exiting cleanly.");
+	Ok (())
+}
+
+struct DecoderThread {
+	join_handle: thread::JoinHandle <Result <()>>,
+}
+
+impl DecoderThread {
+	pub fn new (
+		shared_state: Arc <(Mutex <SharedState>, Condvar)>,
+		filenames: Vec <String>,
+	) -> Self
+	{
+		let join_handle = thread::spawn (move|| {
+			let (lock, cvar) = &*shared_state;
 			
 			'many_files: for filename in &filenames {
 				let mut decoder = decoder::Decoder::new (&filename)?;
@@ -186,32 +215,14 @@ fn cmd_play (args: &[String]) -> Result <()> {
 			Ok::<_, anyhow::Error> (())
 		});
 		
-	let pcm_quit = Arc::new ((Mutex::new (false), Condvar::new ()));
-	let pcm_quit2 = Arc::clone (&pcm_quit);
-	
-	let audio_output = AudioOutput::new (pcm_quit, pair)?;
-	
-	tracing::debug! ("Joining decoder thread...");
-	
-	if false {
-		let mut decoder_state = pair3.0.lock ().unwrap ();
-		decoder_state.quit = true;
-		pair3.1.notify_one ();
+		Self {
+			join_handle,
+		}
 	}
 	
-	thread_decoder.join ().unwrap ()?;
-	
-	tracing::debug! ("Joining PCM thread...");
-	
-	let (lock, cvar) = &*pcm_quit2;
-	let _ = cvar.wait (lock.lock ().unwrap ()).unwrap ();
-	
-	drop (audio_output);
-	
-	sleep (Duration::from_secs (1));
-	
-	tracing::info! ("Exiting cleanly.");
-	Ok (())
+	pub fn join (self) -> Result <()> {
+		self.join_handle.join ().unwrap ()
+	}
 }
 
 struct AudioOutput {
@@ -223,8 +234,9 @@ struct AudioOutput {
 impl AudioOutput {
 	pub fn new (
 		pcm_quit: Arc <(Mutex <bool>, Condvar)>,
-		pair: Arc <(Mutex <SharedState>, Condvar)>,
-	) -> Result <Self> {
+		shared_state: Arc <(Mutex <SharedState>, Condvar)>,
+	) -> Result <Self> 
+	{
 		let host = cpal::default_host ();
 		let device = host.default_output_device ().ok_or_else (|| anyhow! ("can't open cpal device"))?;
 		
@@ -239,7 +251,7 @@ impl AudioOutput {
 		let stream = device.build_output_stream (
 			&config,
 			move |data: &mut [f32], _: &cpal::OutputCallbackInfo| {
-				let (lock, cvar) = &*pair;
+				let (lock, cvar) = &*shared_state;
 				
 				let time_start = Instant::now ();
 				let mut decoder_state = match lock.lock () {
@@ -281,6 +293,14 @@ impl AudioOutput {
 			stream,
 		})
 	}
+	
+	pub fn play (&mut self) -> Result <()> {
+		Ok (self.stream.play ()?)
+	}
+	
+	pub fn pause (&mut self) -> Result <()> {
+		Ok (self.stream.pause ()?)
+	}
 }
 
 #[cfg (test)]