Adds basic support for native APIs for a local song player.

.gitignore

@@ -4,3 +4,8 @@
 /*/build/
 /local.properties
 /browser/profile/extensions/universal_music@regis.edu.xpi
+/browser/profile/cache2/*
+/browser/profile/datareporting/*
+/browser/profile/startupCache/*
+/browser/profile/sessionstore-backups/*
+/browser/profile/lock

WavReader/README.md

@@ -0,0 +1 @@
+These files were originally posted by Andrii Tkachenko on GitHub in 2016. They have been refactored to function in a Gradle environment.

WavReader/build.gradle

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+apply plugin: "java"
+apply plugin: "application"
+
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+
+mainClassName = "MetaReader"

WavReader/src/main/java/MetaReader.java

@@ -0,0 +1,28 @@
+import wave.WavHeader;
+import wave.WavHeaderReader;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+/**
+ * Console utility for reading meta data of the wave files
+ */
+public class MetaReader {
+    public static void main(String[] args) {
+        if (args.length == 0) {
+            System.out.println("Illegal command line arguments.\n" +
+                    "Usage MetaReader\n\t MetaReader <source file path>");
+            return;
+        }
+        WavHeader wavHeader;
+        try {
+            WavHeaderReader wavHeaderReader = new WavHeaderReader(args[0]);
+            wavHeader = wavHeaderReader.read();
+            System.out.println(wavHeader.toString());
+        } catch (FileNotFoundException e) {
+            System.out.println("Error: File " + args[0] + " not found!");
+        } catch (IOException e) {
+            System.out.println("Error: " + e.getMessage());
+        }
+    }
+}

WavReader/src/main/java/wave/WavHeader.java

@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2016. Andrii Tkachenko. https://github.com/tkaczenko/WavReader
+ */
+
+package wave;
+
+/**
+ * This class contains a structure of WAVE file.
+ *
+ * @see <a href =
+ * "https://github.com/tkacz-/WavReader/blob/master/wav-sound-format.gif">
+ * Structure of wave format
+ * </a>
+ */
+public class WavHeader {
+    private byte[] chunkID = new byte[4];
+    private int chunkSize;
+    private byte[] format = new byte[4];
+    private byte[] subChunk1ID = new byte[4];
+    private int subChunk1Size;
+    private short audioFormat;
+    private short numChannels;
+    private int sampleRate;
+    private int byteRate;
+    private short blockAlign;
+    private short bitsPerSample;
+    private byte[] subChunk2ID = new byte[4];
+    private int subChunk2Size;
+
+    @Override
+    public String toString() {
+        return "The RIFF chunk desriptor: " + new String(this.getChunkID()) + "\n" +
+                "Size of this chunk: " + this.getChunkSize() + "\n" +
+                "Format: " + new String(this.getFormat()) + "\n" + "\n" +
+                "fmt subchunk: " + new String(this.getSubChunk1ID()) + "\n" +
+                "Size of this chunk: " + this.getSubChunk1Size() + "\n" +
+                "Audio format: " + this.getAudioFormat() + "\n" +
+                "Number of channels: " + this.getNumChannels() + "\n" +
+                "Sample rate: " + this.getSampleRate() + "\n" +
+                "Byte rate: " + this.getByteRate() + "\n" +
+                "Block align: " + this.getBlockAlign() + "\n" +
+                "Bits per sample: " + this.getBitsPerSample() + "\n" + "\n" +
+                "data subchunk: " + new String(this.getSubChunk2ID()) + "\n" +
+                "Size of this chunk: " + this.getSubChunk2Size();
+    }
+
+    public byte[] getChunkID() {
+        return chunkID;
+    }
+
+    public void setChunkID(byte[] chunkID) {
+        this.chunkID = chunkID;
+    }
+
+    public int getChunkSize() {
+        return chunkSize;
+    }
+
+    public void setChunkSize(int chunkSize) {
+        this.chunkSize = chunkSize;
+    }
+
+    public byte[] getFormat() {
+        return format;
+    }
+
+    public void setFormat(byte[] format) {
+        this.format = format;
+    }
+
+    public byte[] getSubChunk1ID() {
+        return subChunk1ID;
+    }
+
+    public void setSubChunk1ID(byte[] subChunk1ID) {
+        this.subChunk1ID = subChunk1ID;
+    }
+
+    public int getSubChunk1Size() {
+        return subChunk1Size;
+    }
+
+    public void setSubChunk1Size(int subChunk1Size) {
+        this.subChunk1Size = subChunk1Size;
+    }
+
+    public short getAudioFormat() {
+        return audioFormat;
+    }
+
+    public void setAudioFormat(short audioFormat) {
+        this.audioFormat = audioFormat;
+    }
+
+    public short getNumChannels() {
+        return numChannels;
+    }
+
+    public void setNumChannels(short numChannels) {
+        this.numChannels = numChannels;
+    }
+
+    public int getSampleRate() {
+        return sampleRate;
+    }
+
+    public void setSampleRate(int sampleRate) {
+        this.sampleRate = sampleRate;
+    }
+
+    public int getByteRate() {
+        return byteRate;
+    }
+
+    public void setByteRate(int byteRate) {
+        this.byteRate = byteRate;
+    }
+
+    public short getBlockAlign() {
+        return blockAlign;
+    }
+
+    public void setBlockAlign(short blockAlign) {
+        this.blockAlign = blockAlign;
+    }
+
+    public short getBitsPerSample() {
+        return bitsPerSample;
+    }
+
+    public void setBitsPerSample(short bitsPerSample) {
+        this.bitsPerSample = bitsPerSample;
+    }
+
+    public byte[] getSubChunk2ID() {
+        return subChunk2ID;
+    }
+
+    public void setSubChunk2ID(byte[] subChunk2ID) {
+        this.subChunk2ID = subChunk2ID;
+    }
+
+    public int getSubChunk2Size() {
+        return subChunk2Size;
+    }
+
+    public void setSubChunk2Size(int subChunk2Size) {
+        this.subChunk2Size = subChunk2Size;
+    }
+}

WavReader/src/main/java/wave/WavHeaderReader.java

@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2016. Andrii Tkachenko. https://github.com/tkaczenko/WavReader
+ */
+
+package wave;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+
+/**
+ * Custom wave header reader which use class
+ *
+ * @see WavHeader
+ */
+public class WavHeaderReader {
+    /**
+     * Size for the wave header
+     */
+    private static final int HEADER_SIZE = 44;
+
+    /**
+     * Buffer which contain bytes of the wave header
+     */
+    private byte[] buf = new byte[HEADER_SIZE];
+
+    /**
+     * Wave header
+     */
+    private WavHeader header = new WavHeader();
+
+    /**
+     * InputStream to the wave file
+     */
+    private InputStream inputStream;
+
+    /**
+     * Empty constructor
+     */
+    public WavHeaderReader() {
+
+    }
+
+    /**
+     * Constructor which create own FileInputStream
+     *
+     * @param source absolute path to the file
+     * @throws IOException
+     */
+    public WavHeaderReader(String source) throws IOException {
+        inputStream = new FileInputStream(source);
+    }
+
+    /**
+     * Constructor which use created InputStream
+     *
+     * @param inputStream InputStream to the wave file
+     */
+    public WavHeaderReader(InputStream inputStream) {
+        this.inputStream = inputStream;
+    }
+
+    /**
+     * Read wave header of the file
+     *
+     * @return wave.WavHeader object
+     * @throws IOException
+     * @see WavHeader
+     */
+    public WavHeader read() throws IOException {
+        int res = inputStream.read(buf);
+        if (res != HEADER_SIZE) {
+            throw new IOException("Could not read header.");
+        }
+        header.setChunkID(Arrays.copyOfRange(buf, 0, 4));
+        if (new String(header.getChunkID()).compareTo("RIFF") != 0) {
+            throw new IOException("Illegal format.");
+        }
+        header.setChunkSize(toInt(4, false));
+        header.setFormat(Arrays.copyOfRange(buf, 8, 12));
+        header.setSubChunk1ID(Arrays.copyOfRange(buf, 12, 16));
+        header.setSubChunk1Size(toInt(16, false));
+        header.setAudioFormat(toShort(20, false));
+        header.setNumChannels(toShort(22, false));
+        header.setSampleRate(toInt(24, false));
+        header.setByteRate(toInt(28, false));
+        header.setBlockAlign(toShort(32, false));
+        header.setBitsPerSample(toShort(34, false));
+        header.setSubChunk2ID(Arrays.copyOfRange(buf, 36, 40));
+        header.setSubChunk2Size(toInt(40, false));
+        return header;
+    }
+
+    /**
+     * Convert byte[] array to int number
+     *
+     * @param start  start position of the buffer
+     * @param endian <code>true</code> for big-endian
+     *               <code>false</code> for little-endian
+     * @return converted number
+     */
+    private int toInt(int start, boolean endian) {
+        int k = (endian) ? 1 : -1;
+        if (!endian) {
+            start += 3;
+        }
+        return (buf[start] << 24) + (buf[start + k * 1] << 16) +
+                (buf[start + k * 2] << 8) + buf[start + k * 3];
+    }
+
+    /**
+     * Convert byte[] array to short number
+     *
+     * @param start  start position of the buffer
+     * @param endian <code>true</code> for big-endian
+     *               <code>false</code> for little-endian
+     * @return converted number
+     */
+    private short toShort(int start, boolean endian) {
+        short k = (endian) ? (short) 1 : -1;
+        if (!endian) {
+            start++;
+        }
+        return (short) ((buf[start] << 8) + (buf[start + k * 1]));
+    }
+
+    /**
+     * Return the buffer which contain wave hader
+     *
+     * @return buffer
+     */
+    public byte[] getBuf() {
+        return buf;
+    }
+
+    /**
+     * Return wave.WavHeader object which contain wave header
+     *
+     * @return wave.WavHeader object
+     */
+    public WavHeader getHeader() {
+        return header;
+    }
+
+    /**
+     * Return input stream to the wave file
+     *
+     * @return Input steam to the wave file
+     */
+    public InputStream getInputStream() {
+        return inputStream;
+    }
+
+    public void setInputStream(InputStream inputStream) {
+        this.inputStream = inputStream;
+    }
+
+}

interface/build.gradle

@@ -17,6 +17,7 @@ dependencies {
     // The production code uses the SLF4J logging API at compile time
     implementation 'org.slf4j:slf4j-api:1.7.25'
     implementation 'com.google.code.gson:gson:2.8.7'
+    implementation project(":WavReader")
 
     // Declare the dependency for your favourite test framework you want to use in your tests.
     // TestNG is also supported by the Gradle Test task. Just change the
@@ -27,5 +28,12 @@ dependencies {
 
 // Define the main class for the application
 mainClassName = defaultPackage + '.player.Interface'
+//mainClassName = defaultPackage + '.localPlayer.Player'
 
 compileJava.dependsOn rootProject.bundleAddOn
+
+run {
+    systemProperty "java.library.path", file("${project(":player").buildDir}/lib/main/debug").absolutePath
+}
+
+compileJava.dependsOn ':player:linkDebug'

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

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universeplayer.localPlayer;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import wave.WavHeader;
+import wave.WavHeaderReader;
+
+/**
+ * Contains information on a WAV audio file, along with a reference to the stream of raw data.
+ *
+ * @author William Hubbard
+ */
+public class AudioFile extends InputStream
+{
+    /**
+     * Contains header information.
+     */
+    private final WavHeaderReader header;
+    /**
+     * Contains a link to the process reading the audio file.
+     */
+    private final Process process;
+    /**
+     * The stream for the actual audio data.
+     */
+    private InputStream stream;
+
+    /**
+     * Creates an audio file from a stream
+     *
+     * @param stream - The stream to create it from.
+     * @throws IOException - Thrown when an error occurs creating the input stream.
+     */
+    AudioFile(Process stream) throws IOException
+    {
+        this.process = stream;
+        this.stream = stream.getInputStream();
+        this.header = new WavHeaderReader(this.stream);
+        this.header.read();
+    }
+
+    public WavHeader getHeader()
+    {
+        return this.header.getHeader();
+    }
+
+    /**
+     * Obtains the byte string representation of this header.
+     * @return A byte string containing this file's header.
+     */
+    public byte[] getByteStream()
+    {
+        return this.header.getBuf();
+    }
+
+    @Override
+    public int read() throws IOException
+    {
+        return this.stream.read();
+    }
+
+    @Override
+    public int available() throws IOException
+    {
+        return this.process.isAlive() ? Integer.MAX_VALUE : super.available();
+    }
+}

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

@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+package edu.regis.universeplayer.localPlayer;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.LinkedList;
+
+import wave.WavHeader;
+
+/**
+ * This allows for the control of playback of files on the local file system
+ *
+ * @author William Hubbard
+ * @version 0.1
+ */
+public class Player
+{
+    static
+    {
+        System.loadLibrary("player");
+    }
+
+    private int currentId;
+
+    private AudioFile currentFile;
+
+    /**
+     * Sets the file currently being used.
+     *
+     * @param file - The current audio file.
+     */
+    public void setCurrentFile(AudioFile file)
+    {
+        WavHeader header = file.getHeader();
+        this.currentFile = file;
+        // TODO - Ensure that bytes per sample and bits per sample don't bother things
+        this.currentId = this.setCurrentFile(this.currentFile, header.getNumChannels(), header
+                .getBitsPerSample(), header.getSampleRate());
+    }
+
+    /**
+     * Updates the file currently being played.
+     *
+     * @param stream - A reference to the audio data stream.
+     * @param numChannels - The number of audio channels contained in the file.
+     * @param bitsPerSample - The number if bits in every sample.
+     * @param sampleRate - How many samples need to play every second.
+     * @return An ID for the current song.
+     */
+    private native int setCurrentFile(InputStream stream, short numChannels, short bitsPerSample, int sampleRate);
+
+    /**
+     * Saves the current file to
+     *
+     * @param file - The file to save to.
+     */
+    public native void save(String file);
+
+    /**
+     * Saves the current file as a WAVE file somewhere else. This method is meant for testing only.
+     *
+     * @param file - The file to save to.
+     */
+    public void saveJava(String file)
+    {
+        try (FileOutputStream out = new FileOutputStream(file))
+        {
+            out.write(this.getAudioFile().getByteStream());
+            byte[] buffer = new byte[256];
+            int read = this.getAudioFile().read(buffer);
+            while (read > 0)
+            {
+                out.write(buffer, 0, read);
+                read = this.getAudioFile().read(buffer);
+            }
+        }
+        catch (IOException e)
+        {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Obtains the current file.
+     *
+     * @return The current audio file we are working with.
+     */
+    public AudioFile getAudioFile()
+    {
+        return this.currentFile;
+    }
+
+    /**
+     * Plays the current audio file.
+     */
+    public native void play();
+
+    /**
+     * Pauses playback for the current audio file.
+     */
+    public native void pause();
+
+    /**
+     * 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();
+
+    /**
+     * Obtains an input stream for the requested file.
+     *
+     * @param file - The file to read
+     * @return An raw stream for the file
+     * @throws FileNotFoundException - Thrown should the file not exist.
+     * @throws IOException           - Thrown should an error occur when reading the file
+     */
+    public static AudioFile getAudioStream(File file) throws IOException
+    {
+        return new AudioFile(convertFile(file));
+    }
+
+    /**
+     * Converts any audio file to a stream containing WAV audio file data (courtesy of FFMPEG).
+     *
+     * @param file - The file to convert
+     * @return An input stream containing the file data
+     * @throws FileNotFoundException - Thrown should the file not exist.
+     * @throws IOException           - Thrown should an error occur when reading the file
+     */
+    protected static Process convertFile(File file) throws FileNotFoundException, IOException
+    {
+        LinkedList<String> args = new LinkedList<>();
+        if (!file.isFile())
+        {
+            throw new FileNotFoundException("Must provide a file");
+        }
+        args.add("ffmpeg");
+        args.add("-hide_banner");
+        args.add("-loglevel");
+        args.add("error");
+        args.add("-y");
+        args.add("-i");
+        args.add(file.getAbsolutePath());
+        args.add("-f");
+        args.add("wav");
+        args.add("pipe:1");
+        return Runtime.getRuntime().exec(args.toArray(new String[args.size()]));
+    }
+
+    public static void main(String[] args)
+    {
+        byte[] buffer = new byte[200];
+        int len;
+        File file = new File(args[0]);
+        try (AudioFile stream = getAudioStream(new File(args[0])))
+        {
+            Player player = new Player();
+            player.setCurrentFile(stream);
+            player.save(args[0] + ".wav");
+        }
+        catch (IOException e)
+        {
+            e.printStackTrace();
+        }
+        // Compare JNI vs Java
+        try (AudioFile stream = getAudioStream(new File(args[0])))
+        {
+            Player player = new Player();
+            player.setCurrentFile(stream);
+            player.saveJava(args[0] + ".orig.wav");
+        }
+        catch (IOException e)
+        {
+            e.printStackTrace();
+        }
+    }
+}

player/build.gradle

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+import org.gradle.internal.jvm.Jvm
+
+/*
+ * There is currently no "C application" plugin, so this build uses the "C++ application" plugin and then reconfigures it
+ * to build C instead.
+ */
+plugins {
+    id 'cpp-library'
+}
+
+library {
+    binaries.configureEach { CppBinary binary ->
+        def compileTask = binary.compileTask.get()
+        compileTask.includes.from("${Jvm.current().javaHome}/include")
+
+        def osFamily = binary.targetPlatform.targetMachine.operatingSystemFamily
+        if (osFamily.macOs) {
+            compileTask.includes.from("${Jvm.current().javaHome}/include/darwin")
+        } else if (osFamily.linux) {
+            compileTask.includes.from("${Jvm.current().javaHome}/include/linux")
+        } else if (osFamily.windows) {
+            compileTask.includes.from("${Jvm.current().javaHome}/include/win32")
+        }
+
+        compileTask.source.from fileTree(dir: "src/main/c", include: "**/*.c")
+
+        def toolChain = binary.toolChain
+        if (toolChain instanceof VisualCpp) {
+            compileTask.compilerArgs.addAll(["/TC"])
+        } else if (toolChain instanceof GccCompatibleToolChain) {
+            compileTask.compilerArgs.addAll(["-x", "c", "-std=c11"])
+        }
+    }
+}

player/src/main/c/player.c

@@ -0,0 +1,311 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+#include <jni.h>
+#include <stdio.h>
+
+static jclass InputStream;
+static jclass AudioStream;
+static jmethodID AudioStream_getHeader;
+static jmethodID AudioStream_getByteStream;
+static jmethodID AudioStream_readInt;
+static jmethodID InputStream_readBuffer;
+
+static jobject currentFile = NULL;
+
+/**
+ * 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)
+        {
+            printf("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)
+        {
+            printf("Could not find class edu/regis/universeplayer_localPlayer/AudioFile");
+            return 0;
+        }
+        AudioStream = (*env)->NewGlobalRef(env, tempClass);
+    }
+    return AudioStream;
+}
+
+/**
+ * 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)
+        {
+            printf("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)
+        {
+            printf("Could not find InputStream class");
+        }
+        else
+        {
+            InputStream_readBuffer = (*env)->GetMethodID(env, tempClass, "read", "([B)I");
+            printf("Found class java/io/InputStream");
+        }
+    }
+    return AudioStream_readInt;
+}
+
+/**
+ * Obtains an audio stream's header.
+ * @param env - A reference to the JVM.
+ * @param stream - The audio stream to obtain the header from
+ * @return The header information.
+ */
+jobject getHeader(JNIEnv *env, jobject stream)
+{
+    if (AudioStream_getHeader == 0)
+    {
+        getHeaderMethod(env, stream);
+        if (AudioStream_getHeader == 0)
+        {
+            return 0;
+        }
+    }
+    jobject returnValue = (*env)->CallObjectMethod(env, stream, AudioStream_getHeader);
+    return returnValue;
+}
+
+/**
+ * Obtains the original raw byte data for an audio stream's header.
+ * @param env - A reference to the JVM.
+ * @param stream - The audio stream to obtain the header from.
+ * @return The header information.
+ */
+jbyteArray getByteStream(JNIEnv *env, jobject stream)
+{
+    if (AudioStream_getByteStream == 0)
+    {
+        getByteStreamMethod(env, stream);
+        if (AudioStream_getByteStream == 0)
+        {
+            return 0;
+        }
+    }
+    jbyteArray returnValue = (jbyteArray) (*env)->CallObjectMethod(env, stream, AudioStream_getByteStream);
+    return returnValue;
+}
+
+/**
+ * Reads a single integer from the audio stream.
+ * @param env - A reference to the JVM.
+ * @param stream - The audio stream to obtain the header from.
+ * @return The integer read.
+ */
+int readInt(JNIEnv *env, jobject stream)
+{
+    if (AudioStream_readInt == 0)
+    {
+        getReadMethod(env, stream);
+        if (AudioStream_readInt == 0)
+        {
+            return 0;
+        }
+    }
+    jint returnValue = (*env)->CallIntMethod(env, stream, AudioStream_readInt);
+    return (int) returnValue;
+}
+
+/**
+ * Fills a provided buffer with input from the audio stream.
+ * @param env - A reference to the JVM.
+ * @param stream - The audio stream to obtain the header from.
+ * @param buffer - The buffer to read information to
+ * @param bufferSize - The size of the buffer
+ * @return How much information was actually read.
+ */
+int readBuffer(JNIEnv *env, jobject stream, char* buffer, int bufferSize)
+{
+    if (InputStream_readBuffer == 0)
+    {
+        getReadMethod(env, stream);
+        if (InputStream_readBuffer == 0)
+        {
+            printf("readBuffer method not found\n");
+            return 0;
+        }
+        if (AudioStream_readInt == 0)
+        {
+            printf("readInt method not found\n");
+            return 0;
+        }
+    }
+
+    jbyteArray jbuffer = (*env)->NewByteArray(env, bufferSize);
+    jint returnValue = (*env)->CallIntMethod(env, stream, InputStream_readBuffer, jbuffer);
+    jbyte *jbufferEl = (*env)->GetByteArrayElements(env, jbuffer, 0);
+    for (int i = 0; i < returnValue; i++)
+    {
+        buffer[i] = jbufferEl[i];
+    }
+    (*env)->ReleaseByteArrayElements(env, jbuffer, jbufferEl, 0);
+    return returnValue;
+}
+
+/**
+ * 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)
+{
+    if (currentFile != NULL)
+    {
+        (*env)->DeleteLocalRef(env, currentFile);
+    }
+    currentFile = (*env)->NewGlobalRef(env, stream);
+    printf("Setting File\n");
+    return 0;
+}
+
+JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_save(JNIEnv *env, jobject obj, jstring location)
+{
+    int BUFFER_SIZE = 256;
+    char buffer[BUFFER_SIZE];
+    int read;
+
+    FILE *output;
+
+    char buf[128];
+    const char *locationPath = (*env)->GetStringUTFChars(env, location, 0);
+    output = fopen(locationPath, "w");
+
+    if (output == NULL)
+    {
+        printf("File %s can't be opened\n", locationPath);
+        return;
+    }
+
+    // Obtains header data
+    jbyteArray headerData = getByteStream(env, currentFile);
+    jsize headerLength = (*env)->GetArrayLength(env, headerData);
+    jbyte* header = (*env)->GetByteArrayElements(env, headerData, 0);
+    char headerBuff[headerLength];
+    for (int i = 0; i < headerLength; i++)
+    {
+        headerBuff[i] = header[i];
+    }
+    fwrite(headerBuff, headerLength, 1, output);
+    (*env)->ReleaseByteArrayElements(env, headerData, header, 0);
+
+    // Writes the actual file
+    read = readBuffer(env, currentFile, headerBuff, BUFFER_SIZE);
+    while (read > 0)
+    {
+        fwrite(headerBuff, read, 1, output);
+        read = readBuffer(env, currentFile, headerBuff, BUFFER_SIZE);
+    }
+
+    fclose(output);
+    (*env)->ReleaseStringUTFChars(env, location, locationPath);
+
+    return;
+}
+
+JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_play(JNIEnv *env, jobject obj)
+{
+    printf("Playing\n");
+    return;
+}
+
+JNIEXPORT void JNICALL Java_edu_regis_universeplayer_localPlayer_Player_pause(JNIEnv *env, jobject obj)
+{
+    printf("Pausing\n");
+    return;
+}
+
+JNIEXPORT jboolean JNICALL Java_edu_regis_universeplayer_localPlayer_Player_isPaused(JNIEnv *env, jobject obj)
+{
+    printf("Is Paused?\n");
+    return JNI_FALSE;
+}

settings.gradle

@@ -22,3 +22,5 @@ include 'services:webservice'
 rootProject.name = 'UniversalMusicPlayer'
 include ':interface'
 include ':add-on'
+include ':player'
+include ':WavReader'