Some more work with playback.

WARNING: UNSTABLE

browserCommands/src/main/java/edu/regis/universeplayer/browserCommands/CommandConfirmation.java

@@ -17,7 +17,7 @@ public class CommandConfirmation implements Serializable
     /**
      * The error returned by the browser, or null if execution was successful.
      */
-    private BrowserError errorCode;
+    private Throwable errorCode;
     private String message;
     
     /**
@@ -44,7 +44,7 @@ public class CommandConfirmation implements Serializable
      *
      * @param error - The error thrown, or null if the command was successful.
      */
-    public CommandConfirmation(BrowserError error)
+    public CommandConfirmation(Throwable error)
     {
         this.errorCode = error;
     }
@@ -64,7 +64,7 @@ public class CommandConfirmation implements Serializable
      *
      * @return The error, or null if the command was successful.
      */
-    public BrowserError getError()
+    public Throwable getError()
     {
         return this.errorCode;
     }

interface/src/main/java/edu/regis/universeplayer/PlaybackListener.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universeplayer;
+
+import edu.regis.universeplayer.data.Song;
+
+import java.util.EventListener;
+import java.util.EventObject;
+
+/**
+ * A playback listener allows a class to listen for events regarding player
+ * updates.
+ *
+ * @author William Hubbard
+ * @verison 0.1
+ */
+public interface PlaybackListener extends EventListener
+{
+    /**
+     * Called when playback is changed.
+     *
+     * @param status - The playback status.
+     */
+    void onPlaybackChanged(PlaybackInfo status);
+    
+    class PlaybackInfo extends EventObject
+    {
+        private final Song currentSong;
+        /**
+         * The time we are currently at in the song, in seconds.
+         */
+        private final float playTime;
+        
+        /**
+         * The current status of the player.
+         */
+        private final PlaybackStatus status;
+        
+        public PlaybackInfo(Player<? extends Song> player, Song song, float playTime, PlaybackStatus status)
+        {
+            super(player);
+            this.currentSong = song;
+            this.playTime = playTime;
+            this.status = status;
+        }
+        
+        @Override
+        public Player<? extends Song> getSource()
+        {
+            return (Player<? extends Song>) super.getSource();
+        }
+        
+        /**
+         * Obtains the song currently playing.
+         *
+         * @return The current song, or null if none is loaded.
+         */
+        public Song getSong()
+        {
+            return this.currentSong;
+        }
+        
+        /**
+         * Obtains the current play time.
+         *
+         * @return The play time of the player. This will be zero if the song is
+         * stopped or not loaded.
+         */
+        public float getPlayTime()
+        {
+            return this.playTime;
+        }
+        
+        /**
+         * Obtains the current status of the player.
+         *
+         * @return - The player's playback status.
+         */
+        public PlaybackStatus getStatus()
+        {
+            return this.status;
+        }
+    }
+}

interface/src/main/java/edu/regis/universeplayer/PlaybackStatus.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universeplayer;
+
+/**
+ * This contains possible states that a player can be in.
+ */
+public enum PlaybackStatus
+{
+    /**
+     * The player is currently playing a song.
+     */
+    PLAYING,
+    /**
+     * The player has been paused.
+     */
+    PAUSED,
+    /**
+     * The player has a song loaded, but is not playing it.
+     */
+    STOPPED,
+    /**
+     * No song is loaded.
+     */
+    EMPTY;
+}

interface/src/main/java/edu/regis/universeplayer/Player.java

@@ -7,7 +7,7 @@ package edu.regis.universeplayer;
 import edu.regis.universeplayer.browserCommands.QueryFuture;
 import edu.regis.universeplayer.data.Song;
 
-import java.util.concurrent.Future;
+import java.util.HashMap;
 
 /**
  * This interface serves as the connection to a music player of some sort, whether it be
@@ -19,6 +19,31 @@ import java.util.concurrent.Future;
  */
 public interface Player<T extends Song>
 {
+    HashMap<Class<? extends Song>, Player<?>> REGISTERED_PLAYERS = new HashMap<>();
+    
+    /**
+     * Obtains a song player that can play the provided song.
+     *
+     * @param song - The song to play.
+     * @return A compatible player, or null if none is found.
+     */
+    static Player<?> getCompatiblePlayer(Song song)
+    {
+        Player<?> player = REGISTERED_PLAYERS.get(song.getClass());
+        if (player == null)
+        {
+            for (Class<? extends Song> songClass : REGISTERED_PLAYERS.keySet())
+            {
+                if (songClass.isAssignableFrom(song.getClass()))
+                {
+                    player = REGISTERED_PLAYERS.get(songClass);
+                    break;
+                }
+            }
+        }
+        return player;
+    }
+    
     /**
      * Obtains the song currently playing.
      *
@@ -36,22 +61,30 @@ public interface Player<T extends Song>
     
     /**
      * Enables playback of the current song, if one is active.
+     *
      * @return A confirmation of whether the command was successful or not.
      */
     QueryFuture<Void> play();
     
     /**
      * Pauses playback of the current song.
+     *
      * @return A confirmation of whether the command was successful or not.
      */
     QueryFuture<Void> pause();
     
     /**
      * Toggles between playing and pausing the current song.
+     *
      * @return A confirmation of whether the command was successful or not.
      */
     QueryFuture<Void> togglePlayback();
     
+    /**
+     * Stops playback of the current song.
+     */
+    QueryFuture<Void> stopSong();
+    
     /**
      * Sets the current song time to the specified position.
      *
@@ -61,11 +94,10 @@ public interface Player<T extends Song>
     QueryFuture<Void> seek(float time);
     
     /**
-     * Checks to see if the song is paused.
+     * Obtains the player's current playback status.
-     *
+     * @return A future for the request.
-     * @return Whether or not the song is paused.
      */
-    QueryFuture<Boolean> isPaused();
+    QueryFuture<PlaybackStatus> getStatus();
     
     /**
      * Obtains the time we are currently at in the current song.
@@ -83,7 +115,30 @@ public interface Player<T extends Song>
     
     /**
      * Closes the player.
+     *
      * @return A confirmation of whether the player was successfully closed.
      */
     QueryFuture<Void> close();
+    
+    /**
+     * Adds a listener for playback status updates.
+     *
+     * @param listener - The listener to add.
+     */
+    void addPlaybackListener(PlaybackListener listener);
+    
+    /**
+     * Checks to see if a listener has been added.
+     *
+     * @param listener - The listener to look for.
+     * @return True if the provided listener has been added, false otherwise.
+     */
+    boolean hasPlaybackListener(PlaybackListener listener);
+    
+    /**
+     * Removes a listener for playback status updates.
+     *
+     * @param listener - The listener to remove.
+     */
+    void removePlaybackListener(PlaybackListener listener);
 }

interface/src/main/java/edu/regis/universeplayer/browser/InternetSong.java

@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universeplayer.browser;
+
+import edu.regis.universeplayer.data.Song;
+
+import java.net.URL;
+
+public class InternetSong extends Song
+{
+    public URL location;
+}

interface/src/main/java/edu/regis/universeplayer/localPlayer/LocalPlayer.java

@@ -4,6 +4,13 @@
 package edu.regis.universeplayer.localPlayer;
 
 import com.intervigil.wave.WaveReader;
+import edu.regis.universeplayer.PlaybackListener;
+import edu.regis.universeplayer.PlaybackStatus;
+import edu.regis.universeplayer.Player;
+import edu.regis.universeplayer.browserCommands.CommandConfirmation;
+import edu.regis.universeplayer.browserCommands.QueryFuture;
+import edu.regis.universeplayer.data.LocalSong;
+import edu.regis.universeplayer.data.Song;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -13,6 +20,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.LinkedList;
+import java.util.concurrent.*;
 
 /**
  * This allows for the control of playback of files on the local file system
@@ -20,9 +28,9 @@ import java.util.LinkedList;
  * @author William Hubbard
  * @version 0.1
  */
-public class Player
+public class LocalPlayer implements Player<LocalSong>
 {
-    private static final Logger logger = LoggerFactory.getLogger(Player.class);
+    private static final Logger logger = LoggerFactory.getLogger(LocalPlayer.class);
     
     static
     {
@@ -31,8 +39,11 @@ public class Player
     
     private int currentId;
     
+    private LocalSong currentSong;
     private AudioFile currentFile;
     
+    private final ExecutorService service = Executors.newSingleThreadExecutor();
+    
     /**
      * Sets the file currently being used.
      *
@@ -99,22 +110,125 @@ public class Player
         return this.currentFile;
     }
     
+    @Override
+    public Song getCurrentSong()
+    {
+        return this.currentSong;
+    }
+    
+    @Override
+    public QueryFuture<Void> loadSong(LocalSong song)
+    {
+        if (this.currentSong == null)
+        {
+            this.stopSong();
+        }
+        this.currentSong = song;
+        Future<Void> runnable = service.submit(() -> {
+            try
+            {
+                AudioFile stream = getAudioStream(song.file);
+                this.setCurrentFile(stream);
+            }
+            catch (IOException e)
+            {
+                logger.error("Could not load local file " + song.file.getAbsolutePath(), e);
+                throw new RuntimeException(e);
+            }
+            return null;
+        });
+        
+        return new WrappedFuture<>(runnable);
+    }
+    
+    @Override
+    public QueryFuture<Void> play()
+    {
+        return null;
+    }
+    
+    @Override
+    public QueryFuture<Void> pause()
+    {
+        return null;
+    }
+    
+    @Override
+    public QueryFuture<Void> togglePlayback()
+    {
+        return null;
+    }
+    
+    @Override
+    public QueryFuture<Void> stopSong()
+    {
+        return null;
+    }
+    
+    @Override
+    public void addPlaybackListener(PlaybackListener listener)
+    {
+    
+    }
+    
+    @Override
+    public QueryFuture<Void> seek(float time)
+    {
+        return null;
+    }
+    
+    @Override
+    public QueryFuture<PlaybackStatus> getStatus()
+    {
+        return null;
+    }
+    
+    @Override
+    public QueryFuture<Float> getCurrentTime()
+    {
+        return null;
+    }
+    
+    @Override
+    public QueryFuture<Float> getLength()
+    {
+        return null;
+    }
+    
+    @Override
+    public QueryFuture<Void> close()
+    {
+        return null;
+    }
+    
     /**
      * Plays the current audio file.
      */
-    public native void play();
+    public native void playSong();
     
     /**
      * Pauses playback for the current audio file.
      */
-    public native void pause();
+    public native void pauseSong();
     
     /**
      * Checks to see whether the current audio file is paused.
      *
      * @return True if there is an audio file present and it is paused, false otherwise.
      */
-    public native boolean isPaused();
+    public native boolean isSongPaused();
+    
+    @Override
+    public boolean hasPlaybackListener(PlaybackListener listener)
+    {
+        return false;
+    }
+    
+    @Override
+    public void removePlaybackListener(PlaybackListener listener)
+    {
+    
+    }
     
     /**
      * Obtains an input stream for the requested file.
@@ -164,7 +278,7 @@ public class Player
         File file = new File(args[0]);
         try (AudioFile stream = getAudioStream(new File(args[0])))
         {
-            Player player = new Player();
+            LocalPlayer player = new LocalPlayer();
             player.setCurrentFile(stream);
             player.save(args[0] + ".wav");
         }
@@ -175,7 +289,7 @@ public class Player
         // Compare JNI vs Java
         try (AudioFile stream = getAudioStream(new File(args[0])))
         {
-            Player player = new Player();
+            LocalPlayer player = new LocalPlayer();
             player.setCurrentFile(stream);
             player.saveJava(args[0] + ".orig.wav");
         }
@@ -184,4 +298,72 @@ public class Player
             logger.error("Could not save audio file " + file, e);
         }
     }
+    
+    private static class WrappedFuture<T> implements QueryFuture<T>
+    {
+        private final Future<T> runnable;
+    
+        WrappedFuture(Future<T> runnable)
+        {
+            this.runnable = runnable;
+        }
+        
+        @Override
+        public CommandConfirmation getConfirmation() throws CancellationException, ExecutionException, InterruptedException
+        {
+            try
+            {
+                this.runnable.get();
+                return new CommandConfirmation();
+            }
+            catch (ExecutionException e)
+            {
+                return new CommandConfirmation(e);
+            }
+        }
+    
+        @Override
+        public CommandConfirmation getConfirmation(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
+        {
+            try
+            {
+                this.runnable.get(timeout, unit);
+                return new CommandConfirmation();
+            }
+            catch (ExecutionException e)
+            {
+                return new CommandConfirmation(e);
+            }
+        }
+    
+        @Override
+        public boolean cancel(boolean mayInterruptIfRunning)
+        {
+            return this.runnable.cancel(mayInterruptIfRunning);
+        }
+    
+        @Override
+        public boolean isCancelled()
+        {
+            return this.runnable.isCancelled();
+        }
+    
+        @Override
+        public boolean isDone()
+        {
+            return this.runnable.isDone();
+        }
+    
+        @Override
+        public T get() throws InterruptedException, ExecutionException
+        {
+            return this.runnable.get();
+        }
+    
+        @Override
+        public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
+        {
+            return this.runnable.get(timeout, unit);
+        }
+    }
 }

interface/src/main/java/edu/regis/universeplayer/player/Interface.java

@@ -345,7 +345,9 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
         }
         case PAUSE -> {
         }
-        case NEXT -> Queue.getInstance().skipNext();
+        case NEXT -> {
+        
+        }
         case PREVIOUS -> Queue.getInstance().skipPrev();
         case SEEK -> {
         }

interface/src/main/java/edu/regis/universeplayer/player/PlayerControls.java

@@ -4,10 +4,20 @@
 
 package edu.regis.universeplayer.player;
 
+import edu.regis.universeplayer.PlaybackListener;
+import edu.regis.universeplayer.PlaybackStatus;
+import edu.regis.universeplayer.Player;
+import edu.regis.universeplayer.data.Queue;
+import edu.regis.universeplayer.data.Song;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.awt.*;
 import java.awt.event.FocusAdapter;
 import java.awt.event.FocusEvent;
 import java.util.LinkedList;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ForkJoinPool;
 
 import javax.swing.*;
 
@@ -17,14 +27,25 @@ import javax.swing.*;
  * @author William Hubbard
  * @version 0.1
  */
-public class PlayerControls extends JPanel
+public class PlayerControls extends JPanel implements Queue.SongChangeListener, PlaybackListener
 {
+    private static final Logger logger = LoggerFactory.getLogger(PlayerControls.class);
+    private final ImageIcon PLAY_ICON, PAUSE_ICON;
+    
+    /**
+     * A reference to the song currently playing.
+     */
+    private Song currentSong = null;
+    private Player currentPlayer = null;
+    
     private final JButton playButton;
     private final JButton nextButton;
     private final JButton prevButton;
     private final JSlider progress;
     private final JProgressBar updateProgress;
     
+    private final ForkJoinPool service = new ForkJoinPool();
+    
     /**
      * A list of all things interested in knowing when we trigger a command.
      */
@@ -54,15 +75,17 @@ public class PlayerControls extends JPanel
         icon.setImage(icon.getImage().getScaledInstance(ICON_SIZE.width, ICON_SIZE.height, 0));
         this.prevButton.setIcon(icon);
         this.prevButton.setPreferredSize(BUTTON_SIZE);
-        this.prevButton.addActionListener(actionEvent -> this.triggerCommandListeners(PlaybackCommand.PREVIOUS, null));
+        this.prevButton.addActionListener(actionEvent -> this.previousSong());
         buttonCont.add(this.prevButton);
         
         this.playButton = new JButton();
-        icon = new ImageIcon(this.getClass().getResource("/gui/icons/play.png"), "Play Button");
+        PAUSE_ICON = icon = new ImageIcon(this.getClass().getResource("/gui/icons/pause.png"), "Pause Button");
+        icon.setImage(icon.getImage().getScaledInstance(ICON_SIZE.width, ICON_SIZE.height, 0));
+        PLAY_ICON = icon = new ImageIcon(this.getClass().getResource("/gui/icons/play.png"), "Play Button");
         icon.setImage(icon.getImage().getScaledInstance(ICON_SIZE.width, ICON_SIZE.height, 0));
         this.playButton.setIcon(icon);
         this.playButton.setPreferredSize(BUTTON_SIZE);
-        this.playButton.addActionListener(actionEvent -> this.triggerCommandListeners(PlaybackCommand.PLAY, null));
+        this.playButton.addActionListener(actionEvent -> this.togglePlayback());
         buttonCont.add(this.playButton);
         
         this.nextButton = new JButton();
@@ -70,7 +93,7 @@ public class PlayerControls extends JPanel
         icon.setImage(icon.getImage().getScaledInstance(ICON_SIZE.width, ICON_SIZE.height, 0));
         this.nextButton.setIcon(icon);
         this.nextButton.setPreferredSize(BUTTON_SIZE);
-        this.nextButton.addActionListener(actionEvent -> this.triggerCommandListeners(PlaybackCommand.NEXT, null));
+        this.nextButton.addActionListener(actionEvent -> this.nextSong());
         buttonCont.add(this.nextButton);
         
         progressLayout = new SpringLayout();
@@ -78,7 +101,7 @@ public class PlayerControls extends JPanel
         this.add(progressCont);
         
         this.progress = new JSlider();
-        this.progress.addChangeListener(changeEvent -> this.triggerCommandListeners(PlaybackCommand.SEEK, this.progress.getValue()));
+        this.progress.addChangeListener(changeEvent -> this.seek(((JSlider) changeEvent.getSource()).getValue()));
         this.add(this.progress);
         
         this.updateProgress = new JProgressBar();
@@ -122,6 +145,79 @@ public class PlayerControls extends JPanel
         
         layout.putConstraint(SpringLayout.EAST, this, 5, SpringLayout.EAST, this.updateProgress);
         layout.putConstraint(SpringLayout.SOUTH, this, 5, SpringLayout.SOUTH, this.updateProgress);
+        
+        Queue.getInstance().addSongChangeListener(this);
+    }
+    
+    private void seek(int value)
+    {
+        this.service.execute(() -> {
+            if (this.currentPlayer != null)
+            {
+                this.currentPlayer.seek(value);
+            }
+        });
+        this.triggerCommandListeners(PlaybackCommand.SEEK, value);
+    }
+    
+    /**
+     * Toggles the playback of the current song.
+     */
+    private void togglePlayback()
+    {
+        this.service.execute(() -> {
+            try
+            {
+                if (this.currentPlayer != null)
+                {
+                    switch ((PlaybackStatus) this.currentPlayer.getStatus().get())
+                    {
+                    case PAUSED -> {
+                        this.currentPlayer.play();
+                    }
+                    case PLAYING -> {
+                        this.currentPlayer.pause();
+                    }
+                    case STOPPED, EMPTY -> {
+                        if (Queue.getInstance().size() > 0)
+                        {
+                            if (Queue.getInstance().getCurrentSong() == null)
+                            {
+                                Queue.getInstance().skipToSong(0);
+                            }
+                            else
+                            {
+                                this.currentPlayer.play();
+                            }
+                        }
+                    }
+                    }
+                }
+            }
+            catch (ExecutionException | InterruptedException e)
+            {
+                logger.error("Could not get current playback status", e);
+            }
+        });
+        this.triggerCommandListeners(PlaybackCommand.PLAY, null);
+    }
+    
+    /**
+     * Skips to the next song.
+     */
+    private void previousSong()
+    {
+        Queue.getInstance().skipPrev();
+        this.triggerCommandListeners(PlaybackCommand.PREVIOUS, null);
+    }
+    
+    /**
+     * Skips to the next song.
+     */
+    private void nextSong()
+    {
+        Queue.getInstance().skipNext();
+        this.triggerCommandListeners(PlaybackCommand.NEXT, null);
     }
     
     void setUpdateProgress(int updated, int toUpdate, String updating)
@@ -182,4 +278,51 @@ public class PlayerControls extends JPanel
             listener.onCommand(command, data);
         }
     }
+    
+    @Override
+    public void onSongChange(Queue queue)
+    {
+        if (this.currentSong != null)
+        {
+            this.currentPlayer.stopSong();
+        }
+        this.currentSong = queue.getCurrentSong();
+        this.playButton.setIcon(PLAY_ICON);
+        if (this.currentSong != null)
+        {
+            this.currentPlayer = Player.REGISTERED_PLAYERS.get(this.currentSong.getClass());
+            if (!this.currentPlayer.hasPlaybackListener(this))
+            {
+                this.currentPlayer.addPlaybackListener(this);
+            }
+            this.progress.setMaximum((int) (this.currentSong.duration / 1000));
+            if (this.currentPlayer != null)
+            {
+                this.currentPlayer.play();
+            }
+            else
+            {
+                logger.error("No logger found for song {}", this.currentSong.getClass());
+            }
+        }
+        else
+        {
+            this.currentPlayer = null;
+            this.progress.setMaximum(0);
+        }
+    }
+    
+    @Override
+    public void onPlaybackChanged(PlaybackInfo status)
+    {
+        if (status.getSource() != null && status.getSource() == this.currentPlayer)
+        {
+            switch (status.getStatus())
+            {
+            case PLAYING -> this.playButton.setIcon(PAUSE_ICON);
+            case PAUSED, STOPPED, EMPTY -> this.playButton.setIcon(PLAY_ICON);
+            }
+            this.progress.setValue((int) status.getPlayTime());
+        }
+    }
 }

player/build.gradle

@@ -16,6 +16,9 @@ library {
         def compileTask = binary.compileTask.get()
         compileTask.includes.from("${Jvm.current().javaHome}/include")
 
+        compileTask.source.from fileTree(dir: "src/main/c", include: "interface.h")
+        compileTask.source.from fileTree(dir: "src/main/c", include: "interface.c")
+        compileTask.source.from fileTree(dir: "src/main/c", include: "player.h")
         compileTask.source.from fileTree(dir: "src/main/c", include: "player.c")
 
         def osFamily = binary.targetPlatform.targetMachine.operatingSystemFamily
@@ -28,6 +31,7 @@ library {
         } else if (osFamily.windows) {
             compileTask.includes.from("${Jvm.current().javaHome}/include/win32")
             compileTask.source.from fileTree(dir: "src/main/c", include: "player_win.c")
+            compileTask.source.from fileTree(dir: "src/main/c", include: "windows_mutex.c")
         }
 		
         def toolChain = binary.toolChain

player/src/main/c/interface.c

@@ -0,0 +1,259 @@
+#include "interface.h"
+
+/**
+ * This function is used to initialize the static reference to java.io.InputStream class.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An InputStream instance
+ * @return A reference to the InputStream class.
+ */
+jclass getInputStreamClass(JNIEnv *env)
+{
+    if (InputStream == 0 )
+    {
+        jclass tempClass = (*env)->FindClass(env, "java/io/InputStream");
+        if (tempClass == 0)
+        {
+            fprintf(stderr, "Could not find class java/io/InputStream");
+            return 0;
+        }
+        InputStream = (*env)->NewGlobalRef(env, tempClass);
+    }
+    return InputStream;
+}
+
+/**
+ * This function is used to initialize the static reference to the AudioStream class.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the AudioStream class.
+ */
+jclass getAudioStreamClass(JNIEnv *env, jobject audio)
+{
+    if (AudioStream == 0 )
+    {
+        jclass tempClass = (*env)->GetObjectClass(env, audio);
+        if (tempClass == 0)
+        {
+            fprintf(stderr, "Could not find class edu/regis/universeplayer_localPlayer/AudioFile");
+            return 0;
+        }
+        AudioStream = (*env)->NewGlobalRef(env, tempClass);
+    }
+    return AudioStream;
+}
+
+jclass getHeaderClass(JNIEnv *env)
+{
+    if (Header == 0)
+    {
+        jclass tempClass = (*env)->FindClass(env, "wave/WavHeader");
+        if (tempClass == 0)
+        {
+            fprintf(stderr, "Could not find wave/WavHeader");
+            return 0;
+        }
+        Header = (*env)->NewGlobalRef(env, tempClass);
+    }
+    return Header;
+}
+
+/**
+ * This function is used to initialize the static reference to AudioStream's getHeader method.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the getHeader method.
+ */
+jmethodID getHeaderMethod(JNIEnv *env, jobject audio)
+{
+    if (AudioStream_getHeader == 0 )
+    {
+        jclass tempClass = getAudioStreamClass(env, audio);
+        if (tempClass == 0)
+        {
+            return 0;
+        }
+        AudioStream_getHeader = (*env)->GetMethodID(env, tempClass, "getHeader", "()Lwave/WavHeader;");
+    }
+    return AudioStream_getHeader;
+}
+
+/**
+ * This function is used to initialize the static reference to AudioStream's getByteStream method.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the getByteStream method.
+ */
+jmethodID getByteStreamMethod(JNIEnv *env, jobject audio)
+{
+    if (AudioStream_getByteStream == 0 )
+    {
+        jclass tempClass = getAudioStreamClass(env, audio);
+        if (tempClass == 0)
+        {
+            return 0;
+        }
+        AudioStream_getByteStream = (*env)->GetMethodID(env, tempClass, "getByteStream", "()[B");
+    }
+    return AudioStream_getByteStream;
+}
+
+/**
+ * This function is used to initialize the static references to AudioStream's read methods.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the getByteStream method.
+ */
+jmethodID getReadMethod(JNIEnv *env, jobject audio)
+{
+    jclass tempClass;
+    if (AudioStream_readInt == 0)
+    {
+        tempClass = getAudioStreamClass(env, audio);
+        if (tempClass == 0)
+        {
+            fprintf(stderr, "Could not find AudioStream class");
+        }
+        else
+        {
+            AudioStream_readInt = (*env)->GetMethodID(env, tempClass, "read", "()I");
+            printf("Found class AudioStream");
+        }
+    }
+    if (InputStream_readBuffer == 0 )
+    {
+        tempClass = getInputStreamClass(env);
+        if (tempClass == 0)
+        {
+            fprintf(stderr, "Could not find InputStream class");
+        }
+        else
+        {
+            InputStream_readBuffer = (*env)->GetMethodID(env, tempClass, "read", "([B)I");
+            printf("Found class java/io/InputStream");
+        }
+    }
+    return AudioStream_readInt;
+}
+
+/**
+ * This function is used to initialize the static reference to WavHeader's various methods.
+ *
+ * @param env - A reference to the JVM.
+ */
+void getHeaderMethods(JNIEnv *env)
+{
+    jclass tempClass = getHeaderClass(env);
+    if (tempClass == 0)
+    {
+        return;
+    }
+    if (Header_getChunkId == 0)
+    {
+        Header_getChunkId = (*env)->GetMethodID(env, tempClass, "getChunkID", "()[B");
+        if (Header_getChunkId == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getChunkID\n");
+	    }
+    }
+    if (Header_getChunkSize == 0)
+    {
+        Header_getChunkSize = (*env)->GetMethodID(env, tempClass, "getChunkSize", "()I");
+        if (Header_getChunkSize == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getChunkSize\n");
+	    }
+    }
+	if (Header_getFormat == 0)
+    {
+        Header_getFormat = (*env)->GetMethodID(env, tempClass, "getFormat", "()[B");
+	    if (Header_getFormat == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getFormat\n");
+	    }
+    }
+	if (Header_getSubChunk1ID == 0)
+	{
+	    Header_getSubChunk1ID = (*env)->GetMethodID(env, tempClass, "getSubChunk1ID", "()[B");
+	    if (Header_getSubChunk1ID == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk1ID\n");
+	    }
+	}
+	if (Header_getSubChunk1Size == 0)
+	{
+	    Header_getSubChunk1Size = (*env)->GetMethodID(env, tempClass, "getSubChunk1Size", "()I");
+	    if (Header_getSubChunk1Size == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk1Size\n");
+	    }
+	}
+	if (Header_getAudioFormat == 0)
+	{
+	    Header_getAudioFormat = (*env)->GetMethodID(env, tempClass, "getAudioFormat", "()S");
+	    if (Header_getAudioFormat == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getAudioFormat\n");
+	    }
+	}
+	if (Header_getNumChannels == 0)
+	{
+	    Header_getNumChannels = (*env)->GetMethodID(env, tempClass, "getNumChannels", "()S");
+	    if (Header_getNumChannels == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getNumChannels\n");
+	    }
+	}
+	if (Header_getSampleRate == 0)
+	{
+	    Header_getSampleRate = (*env)->GetMethodID(env, tempClass, "getSampleRate", "()I");
+	    if (Header_getSampleRate == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getSampleRate\n");
+	    }
+	}
+	if (Header_getByteRate == 0)
+	{
+	    Header_getByteRate = (*env)->GetMethodID(env, tempClass, "getByteRate", "()I");
+	    if (Header_getByteRate == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getByteRate\n");
+	    }
+	}
+	if (Header_getBlockAlign == 0)
+	{
+	    Header_getBlockAlign = (*env)->GetMethodID(env, tempClass, "getBlockAlign", "()S");
+	    if (Header_getBlockAlign == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getBlockAlign\n");
+	    }
+	}
+	if (Header_getBitsPerSample == 0)
+	{
+	    Header_getBitsPerSample = (*env)->GetMethodID(env, tempClass, "getBitsPerSample", "()S");
+	    if (Header_getBitsPerSample == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getBitsPerSample\n");
+	    }
+	}
+	if (Header_getSubChunk2ID == 0)
+	{
+	    Header_getSubChunk2ID = (*env)->GetMethodID(env, tempClass, "getSubChunk2ID", "()[B");
+	    if (Header_getSubChunk2ID == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk2ID\n");
+	    }
+	}
+	if (Header_getSubChunk2Size == 0)
+	{
+	    Header_getSubChunk2Size = (*env)->GetMethodID(env, tempClass, "getSubChunk2Size", "()I");
+	    if (Header_getSubChunk2Size == 0)
+	    {
+	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk2Size\n");
+	    }
+	}
+}

player/src/main/c/interface.h

@@ -0,0 +1,88 @@
+#ifndef INTERFACE_H
+#define INTERFACE_H
+
+#include <jni.h>
+#include <stdio.h>
+
+typedef struct {
+    short numChannels;
+    short bytesPerChannel;
+    int sampleRate;
+} HeaderData;
+
+static jclass InputStream;
+static jclass AudioStream;
+static jclass Header;
+static jmethodID AudioStream_getHeader;
+static jmethodID AudioStream_getByteStream;
+static jmethodID AudioStream_readInt;
+static jmethodID InputStream_readBuffer;
+static jmethodID Header_getChunkId;
+static jmethodID Header_getChunkSize;
+static jmethodID Header_getFormat;
+static jmethodID Header_getSubChunk1ID;
+static jmethodID Header_getSubChunk1Size;
+static jmethodID Header_getAudioFormat;
+static jmethodID Header_getNumChannels;
+static jmethodID Header_getSampleRate;
+static jmethodID Header_getByteRate;
+static jmethodID Header_getBlockAlign;
+static jmethodID Header_getBitsPerSample;
+static jmethodID Header_getSubChunk2ID;
+static jmethodID Header_getSubChunk2Size;
+
+/**
+ * This function is used to initialize the static reference to java.io.InputStream class.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An InputStream instance
+ * @return A reference to the InputStream class.
+ */
+jclass getInputStreamClass(JNIEnv *env);
+
+/**
+ * This function is used to initialize the static reference to the AudioStream class.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the AudioStream class.
+ */
+jclass getAudioStreamClass(JNIEnv *env, jobject audio);
+
+jclass getHeaderClass(JNIEnv *env);
+
+/**
+ * This function is used to initialize the static reference to AudioStream's getHeader method.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the getHeader method.
+ */
+jmethodID getHeaderMethod(JNIEnv *env, jobject audio);
+
+/**
+ * This function is used to initialize the static reference to AudioStream's getByteStream method.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the getByteStream method.
+ */
+jmethodID getByteStreamMethod(JNIEnv *env, jobject audio);
+
+/**
+ * This function is used to initialize the static references to AudioStream's read methods.
+ *
+ * @param env - A reference to the JVM.
+ * @param audio - An AudioStream instance
+ * @return A reference to the getByteStream method.
+ */
+jmethodID getReadMethod(JNIEnv *env, jobject audio);
+
+/**
+ * This function is used to initialize the static reference to WavHeader's various methods.
+ *
+ * @param env - A reference to the JVM.
+ */
+void getHeaderMethods(JNIEnv *env);
+
+#endif /* INTERFACE_H */

player/src/main/c/player.c

@@ -1,297 +1,20 @@
 /*
  * Copyright (c) 2021 William Hubbard. All Rights Reserved.
  */
-#include <jni.h>
+#include "interface.h"
-#include <stdio.h>
+#include "player.h"
 
-typedef struct {
+play_item_t play_list_head = {
-    short numChannels;
+    0,         /* play_id */
-    short bytesPerChannel;
+    SA_CLEAR,  /* stop_flag */
-    int sampleRate;
+    NULL,      /* prev_item */
-} HeaderData;
+    NULL,      /* next_item */
-
+    NULL       /* mutex */
-static jclass InputStream;
+};
-static jclass AudioStream;
-static jclass Header;
-static jmethodID AudioStream_getHeader;
-static jmethodID AudioStream_getByteStream;
-static jmethodID AudioStream_readInt;
-static jmethodID InputStream_readBuffer;
-static jmethodID Header_getChunkId;
-static jmethodID Header_getChunkSize;
-static jmethodID Header_getFormat;
-static jmethodID Header_getSubChunk1ID;
-static jmethodID Header_getSubChunk1Size;
-static jmethodID Header_getAudioFormat;
-static jmethodID Header_getNumChannels;
-static jmethodID Header_getSampleRate;
-static jmethodID Header_getByteRate;
-static jmethodID Header_getBlockAlign;
-static jmethodID Header_getBitsPerSample;
-static jmethodID Header_getSubChunk2ID;
-static jmethodID Header_getSubChunk2Size;
 
 static jobject currentFile = NULL;
 static HeaderData currentHeader;
 
-/**
- * This function is used to initialize the static reference to java.io.InputStream class.
- *
- * @param env - A reference to the JVM.
- * @param audio - An InputStream instance
- * @return A reference to the InputStream class.
- */
-jclass getInputStreamClass(JNIEnv *env)
-{
-    if (InputStream == 0 )
-    {
-        jclass tempClass = (*env)->FindClass(env, "java/io/InputStream");
-        if (tempClass == 0)
-        {
-            fprintf(stderr, "Could not find class java/io/InputStream");
-            return 0;
-        }
-        InputStream = (*env)->NewGlobalRef(env, tempClass);
-    }
-    return InputStream;
-}
-
-/**
- * This function is used to initialize the static reference to the AudioStream class.
- *
- * @param env - A reference to the JVM.
- * @param audio - An AudioStream instance
- * @return A reference to the AudioStream class.
- */
-jclass getAudioStreamClass(JNIEnv *env, jobject audio)
-{
-    if (AudioStream == 0 )
-    {
-        jclass tempClass = (*env)->GetObjectClass(env, audio);
-        if (tempClass == 0)
-        {
-            fprintf(stderr, "Could not find class edu/regis/universeplayer_localPlayer/AudioFile");
-            return 0;
-        }
-        AudioStream = (*env)->NewGlobalRef(env, tempClass);
-    }
-    return AudioStream;
-}
-
-jclass getHeaderClass(JNIEnv *env)
-{
-    if (Header == 0)
-    {
-        jclass tempClass = (*env)->FindClass(env, "wave/WavHeader");
-        if (tempClass == 0)
-        {
-            fprintf(stderr, "Could not find wave/WavHeader");
-            return 0;
-        }
-        Header = (*env)->NewGlobalRef(env, tempClass);
-    }
-    return Header;
-}
-
-/**
- * This function is used to initialize the static reference to AudioStream's getHeader method.
- *
- * @param env - A reference to the JVM.
- * @param audio - An AudioStream instance
- * @return A reference to the getHeader method.
- */
-jmethodID getHeaderMethod(JNIEnv *env, jobject audio)
-{
-    if (AudioStream_getHeader == 0 )
-    {
-        jclass tempClass = getAudioStreamClass(env, audio);
-        if (tempClass == 0)
-        {
-            return 0;
-        }
-        AudioStream_getHeader = (*env)->GetMethodID(env, tempClass, "getHeader", "()Lwave/WavHeader;");
-    }
-    return AudioStream_getHeader;
-}
-
-/**
- * This function is used to initialize the static reference to AudioStream's getByteStream method.
- *
- * @param env - A reference to the JVM.
- * @param audio - An AudioStream instance
- * @return A reference to the getByteStream method.
- */
-jmethodID getByteStreamMethod(JNIEnv *env, jobject audio)
-{
-    if (AudioStream_getByteStream == 0 )
-    {
-        jclass tempClass = getAudioStreamClass(env, audio);
-        if (tempClass == 0)
-        {
-            return 0;
-        }
-        AudioStream_getByteStream = (*env)->GetMethodID(env, tempClass, "getByteStream", "()[B");
-    }
-    return AudioStream_getByteStream;
-}
-
-/**
- * This function is used to initialize the static references to AudioStream's read methods.
- *
- * @param env - A reference to the JVM.
- * @param audio - An AudioStream instance
- * @return A reference to the getByteStream method.
- */
-jmethodID getReadMethod(JNIEnv *env, jobject audio)
-{
-    jclass tempClass;
-    if (AudioStream_readInt == 0)
-    {
-        tempClass = getAudioStreamClass(env, audio);
-        if (tempClass == 0)
-        {
-            fprintf(stderr, "Could not find AudioStream class");
-        }
-        else
-        {
-            AudioStream_readInt = (*env)->GetMethodID(env, tempClass, "read", "()I");
-            printf("Found class AudioStream");
-        }
-    }
-    if (InputStream_readBuffer == 0 )
-    {
-        tempClass = getInputStreamClass(env);
-        if (tempClass == 0)
-        {
-            fprintf(stderr, "Could not find InputStream class");
-        }
-        else
-        {
-            InputStream_readBuffer = (*env)->GetMethodID(env, tempClass, "read", "([B)I");
-            printf("Found class java/io/InputStream");
-        }
-    }
-    return AudioStream_readInt;
-}
-
-/**
- * This function is used to initialize the static reference to WavHeader's various methods.
- *
- * @param env - A reference to the JVM.
- */
-void getHeaderMethods(JNIEnv *env)
-{
-    jclass tempClass = getHeaderClass(env);
-    if (tempClass == 0)
-    {
-        return;
-    }
-    if (Header_getChunkId == 0)
-    {
-        Header_getChunkId = (*env)->GetMethodID(env, tempClass, "getChunkID", "()[B");
-        if (Header_getChunkId == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getChunkID\n");
-	    }
-    }
-    if (Header_getChunkSize == 0)
-    {
-        Header_getChunkSize = (*env)->GetMethodID(env, tempClass, "getChunkSize", "()I");
-        if (Header_getChunkSize == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getChunkSize\n");
-	    }
-    }
-	if (Header_getFormat == 0)
-    {
-        Header_getFormat = (*env)->GetMethodID(env, tempClass, "getFormat", "()[B");
-	    if (Header_getFormat == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getFormat\n");
-	    }
-    }
-	if (Header_getSubChunk1ID == 0)
-	{
-	    Header_getSubChunk1ID = (*env)->GetMethodID(env, tempClass, "getSubChunk1ID", "()[B");
-	    if (Header_getSubChunk1ID == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk1ID\n");
-	    }
-	}
-	if (Header_getSubChunk1Size == 0)
-	{
-	    Header_getSubChunk1Size = (*env)->GetMethodID(env, tempClass, "getSubChunk1Size", "()I");
-	    if (Header_getSubChunk1Size == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk1Size\n");
-	    }
-	}
-	if (Header_getAudioFormat == 0)
-	{
-	    Header_getAudioFormat = (*env)->GetMethodID(env, tempClass, "getAudioFormat", "()S");
-	    if (Header_getAudioFormat == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getAudioFormat\n");
-	    }
-	}
-	if (Header_getNumChannels == 0)
-	{
-	    Header_getNumChannels = (*env)->GetMethodID(env, tempClass, "getNumChannels", "()S");
-	    if (Header_getNumChannels == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getNumChannels\n");
-	    }
-	}
-	if (Header_getSampleRate == 0)
-	{
-	    Header_getSampleRate = (*env)->GetMethodID(env, tempClass, "getSampleRate", "()I");
-	    if (Header_getSampleRate == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getSampleRate\n");
-	    }
-	}
-	if (Header_getByteRate == 0)
-	{
-	    Header_getByteRate = (*env)->GetMethodID(env, tempClass, "getByteRate", "()I");
-	    if (Header_getByteRate == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getByteRate\n");
-	    }
-	}
-	if (Header_getBlockAlign == 0)
-	{
-	    Header_getBlockAlign = (*env)->GetMethodID(env, tempClass, "getBlockAlign", "()S");
-	    if (Header_getBlockAlign == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getBlockAlign\n");
-	    }
-	}
-	if (Header_getBitsPerSample == 0)
-	{
-	    Header_getBitsPerSample = (*env)->GetMethodID(env, tempClass, "getBitsPerSample", "()S");
-	    if (Header_getBitsPerSample == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getBitsPerSample\n");
-	    }
-	}
-	if (Header_getSubChunk2ID == 0)
-	{
-	    Header_getSubChunk2ID = (*env)->GetMethodID(env, tempClass, "getSubChunk2ID", "()[B");
-	    if (Header_getSubChunk2ID == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk2ID\n");
-	    }
-	}
-	if (Header_getSubChunk2Size == 0)
-	{
-	    Header_getSubChunk2Size = (*env)->GetMethodID(env, tempClass, "getSubChunk2Size", "()I");
-	    if (Header_getSubChunk2Size == 0)
-	    {
-	        fprintf(stderr, "Could not find wave/WavHeader#getSubChunk2Size\n");
-	    }
-	}
-}
-
 /**
  * Obtains an audio stream's header.
  * @param env - A reference to the JVM.
@@ -409,7 +132,7 @@ HeaderData readHeader(JNIEnv *env, jobject header, HeaderData *headerStruct)
 /**
  * Sets the file currently being used
  */
-JNIEXPORT jint JNICALL Java_edu_regis_universeplayer_localPlayer_Player_setCurrentFile(JNIEnv *env, jobject obj, jobject stream, jshort numChannels, jshort bitsPerSample, jint sampleRate)
+JNIEXPORT jint JNICALL Java_edu_regis_universeplayer_localPlayer_LocalPlayer_setCurrentFile(JNIEnv *env, jobject obj, jobject stream, jshort numChannels, jshort bitsPerSample, jint sampleRate)
 {
     jobject header;
     if (currentFile != NULL)
@@ -423,7 +146,7 @@ JNIEXPORT jint JNICALL Java_edu_regis_universeplayer_localPlayer_Player_setCurre
     return updatePlayer(env, obj, stream, numChannels, bitsPerSample, sampleRate);
 }
 
-JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_save(JNIEnv *env, jobject obj, jstring location)
+JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_LocalPlayer_save(JNIEnv *env, jobject obj, jstring location)
 {
     const int BUFFER_SIZE = 256;
 	/*
@@ -471,19 +194,19 @@ JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_save(JNI
     return;
 }
 
-JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_play(JNIEnv *env, jobject obj)
+JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_LocalPlayer_playSong(JNIEnv *env, jobject obj)
 {
     printf("Playing\n");
     return;
 }
 
-JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_pause(JNIEnv *env, jobject obj)
+JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_LocalPlayer_pauseSong(JNIEnv *env, jobject obj)
 {
     printf("Pausing\n");
     return;
 }
 
-JNIEXPORT jboolean JNICALL Java_edu_regis_universeplayer_localPlayer_Player_isPaused(JNIEnv *env, jobject obj)
+JNIEXPORT jboolean JNICALL Java_edu_regis_universeplayer_localPlayer_LocalPlayer_isSongPaused(JNIEnv *env, jobject obj)
 {
     printf("Is Paused?\n");
     return JNI_FALSE;

player/src/main/c/player.h

@@ -0,0 +1,65 @@
+/*
+Simpleaudio Python Extension
+Copyright (C) 2015, Joe Hamilton
+MIT License (see LICENSE.txt)
+*/
+
+#ifndef SIMPLEAUDIO_H
+#define SIMPLEAUDIO_H
+
+#include <jni.h>
+#include <stdio.h>
+
+#define SA_ERR_STR_LEN (256)
+
+#define SA_CLEAR (0)
+#define SA_STOP (1)
+
+enum {
+    NOT_LAST_ITEM = 0,
+    LAST_ITEM = 1
+};
+
+typedef unsigned long long play_id_t;
+
+/* linked list structure used to track the active playback items/threads */
+typedef struct play_item_s {
+    /* the play_id of the list head is used to store the next play_id value
+       used by a new play list item */
+    play_id_t play_id;
+    int stop_flag;
+    struct play_item_s* prev_item;
+    struct play_item_s* next_item;
+    /* the mutex of the list head is used as a 'global' mutex for modifying
+       and accessing the list itself */
+    void* mutex;
+} play_item_t;
+
+typedef struct {
+    jobject buffer_obj;
+    void* handle;
+    int used_bytes;
+    int len_bytes;
+    int num_buffers;
+    int frame_size;
+    int buffer_size;
+    play_item_t* play_list_item;
+    void* list_mutex;
+} audio_blob_t;
+
+jint* play_os(jobject buffer_obj, int len_samples, int num_channels, int bytes_per_chan, int sample_rate, play_item_t* play_list_head, int latency_us);
+
+void delete_list_item(play_item_t* play_item);
+play_item_t* new_list_item(play_item_t* list_head);
+
+void destroy_audio_blob(audio_blob_t* audio_blob);
+audio_blob_t* create_audio_blob(void);
+
+int get_buffer_size(int latency_us, int sample_rate, int frame_size);
+
+void* create_mutex(void);
+void destroy_mutex(void* mutex);
+void grab_mutex(void* mutex);
+void release_mutex(void* mutex);
+
+#endif /* SIMPLEAUDIO_H */

player/src/main/c/player_win.c

@@ -1,11 +1,112 @@
 /*
- * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+Simpleaudio Python Extension
+Copyright (C) 2015, Joe Hamilton
+MIT License (see LICENSE.txt)
 */
-#include <jni.h>
+#include "simpleaudio.h"
-#include <stdio.h>
+#include <Windows.h>
+#include <mmreg.h>
+#include <stdlib.h>
 
 int updatePlayer(JNIEnv *env, jobject obj, jobject stream, jshort numChannels, jshort bitsPerSample, jint sampleRate)
 {
     printf("Updating File\n");
     return 0;
 }
+
+jint play_os(jobject buffer_obj, int len_samples, int num_channels, int bytes_per_chan, int sample_rate, play_item_t* play_list_head, int latency_us)
+{
+    char err_msg_buf[SA_ERR_STR_LEN];
+    char sys_msg_buf[SA_ERR_STR_LEN / 2];
+    audio_blob_t* audio_blob;
+
+    WAVEFORMATEX audio_format;
+        MMRESULT result;
+        HANDLE thread_handle = NULL;
+        DWORD thread_id;
+        int bytes_per_frame = bytes_per_chan * num_channels;
+        WAVEHDR* temp_wave_hdr;
+        int buffer_size;
+        int i;
+
+        DBG_PLAY_OS_CALL
+
+        buffer_size = get_buffer_size(latency_us / NUM_BUFS, sample_rate, bytes_per_chan * num_channels);
+
+        audio_blob = create_audio_blob();
+        audio_blob->buffer_obj = buffer_obj;
+        audio_blob->list_mutex = play_list_head->mutex;
+        audio_blob->len_bytes = len_samples * bytes_per_frame;
+        audio_blob->num_buffers = NUM_BUFS;
+
+        /* setup the linked list item for this playback buffer */
+        grab_mutex(play_list_head->mutex);
+        audio_blob->play_list_item = new_list_item(play_list_head);
+        release_mutex(play_list_head->mutex);
+
+        /* windows audio device and format headers setup */
+        if (bytes_per_chan < 4) {
+            audio_format.wFormatTag = WAVE_FORMAT_PCM;
+        } else {
+            audio_format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
+        }
+        audio_format.nChannels = num_channels;
+
+        audio_format.nSamplesPerSec = sample_rate;
+        audio_format.nBlockAlign = bytes_per_frame;
+        /* per MSDN WAVEFORMATEX documentation */
+        audio_format.nAvgBytesPerSec = audio_format.nSamplesPerSec * audio_format.nBlockAlign;
+        audio_format.wBitsPerSample = bytes_per_chan * 8;
+        audio_format.cbSize = 0;
+
+        /* create the cleanup thread so we can return after calling waveOutWrite
+           SEE :http://msdn.microsoft.com/en-us/library/windows/desktop/ms682516(v=vs.85).aspx
+        */
+        thread_handle = CreateThread(NULL, 0, bufferThread, audio_blob, 0, &thread_id);
+        if (thread_handle != NULL) {
+            /* Close so we don't leak handles - similar to detatched POSIX threads */
+            CloseHandle(thread_handle);
+        } else {
+            DWORD lastError = GetLastError();
+            /* lang code : US En */
+            FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS), NULL, lastError, 0x0409, sys_msg_buf, SYS_STR_LEN, NULL);
+            WIN_EXCEPTION("Failed to start cleanup thread.", 0, sys_msg_buf, err_msg_buf);
+
+            destroy_audio_blob(audio_blob);
+            return NULL;
+        }
+
+        /* open a handle to the default audio device */
+        result = waveOutOpen((HWAVEOUT*)&audio_blob->handle, WAVE_MAPPER, &audio_format, thread_id, 0, CALLBACK_THREAD);
+        if (result != MMSYSERR_NOERROR) {
+            waveOutGetErrorText(result, sys_msg_buf, SYS_STR_LEN);
+            WIN_EXCEPTION("Failed to open audio device.", result, sys_msg_buf, err_msg_buf);
+
+            PostThreadMessage(thread_id, WM_QUIT, 0, 0);
+            destroy_audio_blob(audio_blob);
+            return NULL;
+        }
+
+        dbg1("allocating %d buffers of %d bytes\n", NUM_BUFS, buffer_size);
+
+        for (i = 0; i < NUM_BUFS; i++) {
+            temp_wave_hdr = PyMem_Malloc(sizeof(WAVEHDR));
+            memset(temp_wave_hdr, 0, sizeof(WAVEHDR));
+            temp_wave_hdr->lpData = PyMem_Malloc(buffer_size);
+            temp_wave_hdr->dwBufferLength = buffer_size;
+
+            result = fill_buffer(temp_wave_hdr, audio_blob);
+            if (result != MMSYSERR_NOERROR) {
+                waveOutGetErrorText(result, sys_msg_buf, SYS_STR_LEN);
+                WIN_EXCEPTION("Failed to buffer audio.", result, sys_msg_buf, err_msg_buf);
+
+                PostThreadMessage(thread_id, WM_QUIT, 0, 0);
+                waveOutUnprepareHeader(audio_blob->handle, temp_wave_hdr, sizeof(WAVEHDR));
+                waveOutClose(audio_blob->handle);
+                destroy_audio_blob(audio_blob);
+                return NULL;
+            }
+        }
+
+        return PyLong_FromUnsignedLongLong(audio_blob->play_list_item->play_id);
+}

player/src/main/c/windows_mutex.c

@@ -0,0 +1,27 @@
+/*
+Simpleaudio Python Extension
+Copyright (C) 2015, Joe Hamilton
+MIT License (see LICENSE.txt)
+*/
+
+#include "player.h"
+#include <stdlib.h>
+#include <Windows.h>
+
+void* create_mutex() {
+  void* mutex;
+  mutex = (void*)CreateMutex(NULL, FALSE, NULL);
+  return mutex;
+}
+
+void destroy_mutex(void* mutex) {
+  CloseHandle((HANDLE)mutex);
+}
+
+void grab_mutex(void* mutex) {
+  WaitForSingleObject((HANDLE)mutex, INFINITE);
+}
+
+void release_mutex(void* mutex) {
+  ReleaseMutex((HANDLE)mutex);
+}