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tbarnes98
2019-08-13 12:23:06 -05:00
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1
Lab 1/.idea/.name generated Normal file
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Lab1

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Lab 1/.idea/checkstyle-idea.xml generated Normal file
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6
Lab 1/.idea/checkstyleidea-libs/readme.txt generated Normal file
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This folder contains libraries copied from the "Lab1" project.
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uncheck the "Copy libraries from project directory" option in the CheckStyle-IDEA settings dialog.

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Lab 1/.idea/misc.xml generated Normal file
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</list>
</option>
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</settings>
</state>
<state key="FacetStructureConfigurable.UI">
<settings>
<last-edited>No facets are configured</last-edited>
<splitter-proportions>
<option name="proportions">
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

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<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
"-//Puppy Crawl//DTD Check Configuration 1.3//EN"
"http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="Checker">
<!--
If you set the basedir property below, then all reported file
names will be relative to the specified directory. See
http://checkstyle.sourceforge.net/5.x/config.html#Checker
<property name="basedir" value="${basedir}"/>
-->
<property name="fileExtensions" value="java, properties, xml"/>
<!-- See http://checkstyle.sf.net/config_sizes.html -->
<module name="FileLength"/>
<!-- Checks for whitespace -->
<!-- See http://checkstyle.sf.net/config_whitespace.html -->
<module name="FileTabCharacter"/>
<!-- Checks for Headers -->
<module name="RegexpHeader">
<property name="header" value= "/\*\n \* SE1021"/>
</module>
<module name="TreeWalker">
<!-- Checks for Javadoc comments. -->
<!-- See http://checkstyle.sf.net/config_javadoc.html -->
<module name="JavadocMethod">
<property name="minLineCount" value="1"/>
<property name="scope" value="public"/>
<property name="allowMissingPropertyJavadoc" value="true"/>
<property name="ignoreMethodNamesRegex" value="main"/>
<property name="allowedAnnotations" value=" "/>
</module>
<module name="JavadocType">
<property name="authorFormat" value="\S"/>
<property name="versionFormat" value="\S"/>
</module>
<module name="JavadocVariable">
<property name="scope" value="public"/>
</module>
<module name="JavadocStyle">
<property name="checkFirstSentence" value="false"/>
<property name="checkEmptyJavadoc" value="true"/>
</module>
<!-- Checks for Naming Conventions. -->
<!-- See http://checkstyle.sf.net/config_naming.html -->
<module name="ConstantName"/>
<module name="LocalVariableName"/>
<module name="MemberName"/>
<module name="MethodName"/>
<module name="ParameterName"/>
<module name="StaticVariableName"/>
<module name="TypeName"/>
<!-- Checks for imports -->
<!-- See http://checkstyle.sf.net/config_import.html -->
<module name="AvoidStarImport"/>
<module name="IllegalImport"/> <!-- defaults to sun.* packages -->
<module name="RedundantImport"/>
<module name="UnusedImports">
<property name="processJavadoc" value="false"/>
</module>
<!-- Checks for Size Violations. -->
<!-- See http://checkstyle.sf.net/config_sizes.html -->
<module name="LineLength">
<property name="max" value="120"/>
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<module name="MethodLength"/>
<module name="ParameterNumber"/>
<!-- Checks for whitespace -->
<!-- See http://checkstyle.sf.net/config_whitespace.html -->
<module name="GenericWhitespace"/>
<module name="MethodParamPad"/>
<module name="NoWhitespaceBefore"/>
<module name="ParenPad"/>
<!-- Modifier Checks -->
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<module name="ModifierOrder"/>
<!-- Checks for blocks. You know, those {}'s -->
<!-- See http://checkstyle.sf.net/config_blocks.html -->
<module name="AvoidNestedBlocks"/>
<module name="EmptyBlock"/>
<module name="LeftCurly"/>
<module name="NeedBraces"/>
<module name="RightCurly"/>
<!-- Checks for common coding problems -->
<!-- See http://checkstyle.sf.net/config_coding.html -->
<module name="AvoidInlineConditionals"/>
<module name="EmptyStatement"/>
<module name="EqualsHashCode"/>
<module name="IllegalInstantiation"/>
<module name="InnerAssignment"/>
<module name="MagicNumber">
<property name="ignoreNumbers" value="-1, 0, 1, 2, 3, 4"/>
<property name="ignoreAnnotation" value="true"/>
</module>
<module name="SimplifyBooleanExpression"/>
<module name="SimplifyBooleanReturn"/>
<!-- find incomplete autogenerated code -->
<module name="TodoComment">
<property name="format" value="(TODO)|(FIXME)|(Todo)|(to do)"/>
</module>
<module name="RegexpSinglelineJava">
<property name="format" value=" e\.printStackTrace\(\);"/>
<property name="ignoreComments" value="true"/>
</module>
<module name="RegexpSinglelineJava">
<property name="format" value="\* Created by [a-zA-Z 0-9]+ on [0-9]{1,2}/[0-9]{1,2}/[0-9]{4}\."/>
<property name="message" value="Autogenerated class comment"/>
</module>
<!-- Miscellaneous other checks. -->
<!-- See http://checkstyle.sf.net/config_misc.html -->
<module name="UpperEll"/>
<module name="MissingOverride"/>
<module name="IllegalCatch"/>
<module name="IllegalThrows"/>
<module name="OneTopLevelClass"/>
<module name="Indentation">
<property name="arrayInitIndent" value="8"/>
<property name="lineWrappingIndentation" value="8"/>
</module>
</module>
</module>

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/*
* SE1021
* Spring 2017
* Lab 1 - WavFiles
* Name: Trevor Barnes
* Created: 3/7/18
*/
package barnestr;
import edu.msoe.taylor.audio.WavFile;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
/**
* Uses ArrayList to read and write .wav files.
*
* @author barnestr
* @version 1
*/
public class Lab1 {
static Scanner in = new Scanner(System.in);
static final int SAMPLE_RATE = 8000;
static final int VALID_BITS = 8;
static String option;
public static void main(String[] args) {
do {
String option = introOption();
if (option.equals("1")) {
fileReverser();
} else if (option.equals("2")) {
singleToneGenerator();
} else if (option.equals("3")) {
doubleToneGenerator();
} else {
System.exit(0);
}
} while (option.equals("1") || option.equals("2") || option.equals("3"));
}
/**
* Displays options for user
*
* @return option from user
*/
private static String introOption() {
System.out.println("Enter an option (0,1,2,3) to initiate.\n" +
"0. Exits Program\n" +
"1. Create a reversed version of a .wav file.\n" +
"2. Create a .wav file containing a one second tone at a given frequency.\n" +
"3. Create a .wav file containing a one second stereo sound with two tones given " +
"frequencies.\n");
option = in.nextLine();
while (!(option.equals("0") || option.equals("1") || option.equals("2") || option.equals("3"))) {
System.out.println("Please enter 0, 1, 2, or 3.");
option = in.nextLine();
}
return option;
}
/**
* Reverses given file
*/
public static void fileReverser() {
System.out.println("Enter a .wav filename (without .wav extension) with audio samples to be placed in " +
"reverse order.");
String filename = in.next(); //Receives original filename
WavFile original = new WavFile(filename + ".wav"); //Creates WavFile with original filename
ArrayList<Double> samples = new ArrayList<>();
samples.addAll(original.getSamples());
Collections.reverse(samples);
WavFile file = new WavFile(filename + "Rev.wav", original.getNumChannels(), original.getNumFrames(),
original.getValidBits(), original.getSampleRate());
file.setSamples(samples);
file.close();
System.out.println("File reversed with name " + filename + "Rev.wav \n");
}
/**
* Generates a .wav file with a one second tone
*/
public static void singleToneGenerator() {
System.out.println("Enter a .wav filename (without .wav extension) to be created.");
String filename = in.next();
System.out.println("Enter the frequency of tone to be created.");
double frequency = in.nextDouble();
ArrayList<Double> samples = new ArrayList();
for (int i = 0; i < SAMPLE_RATE; i++) {
samples.add(Math.sin(2 * Math.PI * i * (frequency / SAMPLE_RATE)));
}
WavFile file = new WavFile(filename + ".wav", 1, SAMPLE_RATE, VALID_BITS, SAMPLE_RATE);
file.setSamples(samples);
file.close();
System.out.println("File with generated single tone created as " + filename + ".wav \n");
}
/**
* Generates a .wav file with two one second tones in stereo
*/
public static void doubleToneGenerator() {
System.out.println("Enter a .wav filename (without .wav extension) of stereo file to be created.");
String filename = in.next();
System.out.println("Enter the first frequency of tone to be created.");
int frequency1 = in.nextInt();
System.out.println("Enter the second frequency of tone to be created.");
int frequency2 = in.nextInt();
ArrayList samples = new ArrayList();
for (int i = 0; i < SAMPLE_RATE; i = i + 2) {
samples.add(Math.sin(2 * Math.PI * i * (frequency1 / SAMPLE_RATE)));
}
for (int i = 1; i < SAMPLE_RATE; i = i + 2) {
samples.add(Math.sin(2 * Math.PI * i * (frequency2 / SAMPLE_RATE)));
}
WavFile file = new WavFile(filename + ".wav", 2, SAMPLE_RATE, VALID_BITS, SAMPLE_RATE);
file.setSamples(samples);
file.close();
}
}

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/*
* Developed for SE1021
* Winter 2017-2018
* Lab 1
* Name: Dr. Chris Taylor
* Created: 11/21/2017
*/
// You must not change the following package declaration.
// Instead, you must place this file in the appropriate folder.
package edu.msoe.taylor.audio;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
/**
* A simple class for reading, writing, and accessing audio samples
* associated with a .wav file.
*
* The class is based on a similar class developed by A. Greensted.
* http://www.labbookpages.co.uk/audio/javaWavFiles.html
* <p>
* The file format is based on information from:
* http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
* http://www.blitter.com/~russtopia/MIDI/~jglatt/tech/wave.htm
* </p>
* @author edu.msoe@taylor and A.Greensted
* @version 20171121.5
*/
public class WavFile {
private enum IOState {READING, WRITING, CLOSED}
private final static int BUFFER_SIZE = 4096;
private final static int FMT_CHUNK_ID = 0x20746D66;
private final static int DATA_CHUNK_ID = 0x61746164;
private final static int RIFF_CHUNK_ID = 0x46464952;
private final static int RIFF_TYPE_ID = 0x45564157;
private File file; // File that will be read from or written to
private IOState ioState; // Specifies the IO State of the Wav File (used for sanity
// checking)
private int bytesPerSample; // Number of bytes required to store a single sample
private long numFrames; // Number of frames within the data section
private FileOutputStream oStream; // Output stream used for writing data
private FileInputStream iStream; // Input stream used for reading data
private double floatScale; // Scaling factor used for int <-> float conversion
private double floatOffset; // Offset factor used for int <-> float conversion
private boolean wordAlignAdjust; // Specify if an extra byte at the end of the data chunk is
// required for word alignment
// Wav Header
private int numChannels; // 2 bytes unsigned, 0x0001 (1) to 0xFFFF (65,535)
private long sampleRate; // 4 bytes unsigned, 0x00000001 (1) to 0xFFFFFFFF
// (4,294,967,295)
// Although a java int is 4 bytes, it is signed, so need to
// use a long
private int blockAlign; // 2 bytes unsigned, 0x0001 (1) to 0xFFFF (65,535)
private int validBits; // 2 bytes unsigned, 0x0002 (2) to 0xFFFF (65,535)
// Buffering
private byte[] innerBuffer; // Local innerBuffer used for IO
private int bufferPointer; // Points to the current position in innerBuffer
private int bytesRead; // Bytes read after last read into innerBuffer
private long frameCounter; // Current number of frames read or written
/**
* This constructor should not be called directly.
*/
private WavFile() {
innerBuffer = new byte[BUFFER_SIZE];
}
/**
* Constructor for creating a WavFile object to be read from a file.
* @param filename The filename of the file to be read into this object
*/
public WavFile(String filename) {
this();
this.file = new File(filename);
try {
// Create a new file input stream for reading file data
iStream = new FileInputStream(file);
// Read the first 12 bytes of the file
int bytesRead = iStream.read(innerBuffer, 0, 12);
if(bytesRead!=12) {
throw new RuntimeException("Not enough wav file bytes for header");
}
} catch (IOException e) {
throw new RuntimeException("Encountered and error reading: " + e.getMessage());
}
// Extract parts from the header
long riffChunkID = getLE(innerBuffer, 0, 4);
long chunkSize = getLE(innerBuffer, 4, 4);
long riffTypeID = getLE(innerBuffer, 8, 4);
// Check the header bytes contains the correct signature
if(riffChunkID!=RIFF_CHUNK_ID) {
throw new RuntimeException("Invalid Wav Header data, incorrect riff chunk ID");
}
if(riffTypeID!=RIFF_TYPE_ID) {
throw new RuntimeException("Invalid Wav Header data, incorrect riff type ID");
}
// Check that the file size matches the number of bytes listed in header
if(this.file.length()!=chunkSize+8) {
throw new RuntimeException("Header chunk size (" + chunkSize +
") does not match file size (" + this.file.length() + ")");
}
boolean foundFormat = false;
boolean foundData = false;
// Search for the Format and Data Chunks
while(!foundData) {
// Read the first 8 bytes of the chunk (ID and chunk size)
try {
bytesRead = iStream.read(innerBuffer, 0, 8);
} catch (IOException e) {
throw new RuntimeException("Encountered and error reading: " + e.getMessage());
}
if(bytesRead==-1) {
throw new RuntimeException("Reached end of file without finding format chunk");
}
if(bytesRead!=8) {
throw new RuntimeException("Could not read chunk header");
}
// Extract the chunk ID and Size
long chunkID = getLE(innerBuffer, 0, 4);
chunkSize = getLE(innerBuffer, 4, 4);
// Word align the chunk size
// chunkSize specifies the number of bytes holding data. However,
// the data should be word aligned (2 bytes) so we need to calculate
// the actual number of bytes in the chunk
long numChunkBytes = (chunkSize%2 == 1) ? chunkSize+1 : chunkSize;
if(chunkID==FMT_CHUNK_ID) {
// Flag that the format chunk has been found
foundFormat = true;
// Read in the header info
try {
iStream.read(innerBuffer, 0, 16);
} catch (IOException e) {
throw new RuntimeException("Encountered and error reading: " + e.getMessage());
}
// Check this is uncompressed data
int compressionCode = (int)getLE(innerBuffer, 0, 2);
if(compressionCode!=1) {
throw new RuntimeException("Compression Code " + compressionCode +
" not supported");
}
// Extract the format information
numChannels = (int)getLE(innerBuffer, 2, 2);
sampleRate = getLE(innerBuffer, 4, 4);
blockAlign = (int)getLE(innerBuffer, 12, 2);
validBits = (int)getLE(innerBuffer, 14, 2);
if(numChannels==0) {
throw new RuntimeException("Number of channels specified in header is " +
"equal to zero");
}
if(blockAlign==0) {
throw new RuntimeException("Block Align specified in header is equal to zero");
}
if(validBits<2) {
throw new RuntimeException("Valid Bits specified in header is less than 2");
}
if(validBits>64) {
throw new RuntimeException("Valid Bits specified in header is greater than " +
"64, this is greater than a long can hold");
}
// Calculate the number of bytes required to hold 1 sample
bytesPerSample = (validBits + 7) / 8;
if(bytesPerSample*numChannels!=blockAlign) {
throw new RuntimeException("Block Align does not agree with bytes required " +
"for validBits and number of channels");
}
// Account for number of format bytes and then skip over
// any extra format bytes
numChunkBytes -= 16;
if(numChunkBytes>0) {
try {
iStream.skip(numChunkBytes);
} catch (IOException e) {
throw new RuntimeException("Encountered and error reading: " +
e.getMessage());
}
}
} else if(chunkID==DATA_CHUNK_ID) {
// Check if we've found the format chunk,
// If not, throw an exception as we need the format information
// before we can read the data chunk
if(!foundFormat) {
throw new RuntimeException("Data chunk found before Format chunk");
}
// Check that the chunkSize (wav data length) is a multiple of the
// block align (bytes per frame)
if(chunkSize%blockAlign!=0) {
throw new RuntimeException("Data Chunk size is not multiple of Block Align");
}
// Calculate the number of frames
numFrames = chunkSize / blockAlign;
// Flag that we've found the wave data chunk
foundData = true;
} else {
// If an unknown chunk ID is found, just skip over the chunk data
try {
iStream.skip(numChunkBytes);
} catch (IOException e) {
throw new RuntimeException("Encountered and error reading: " + e.getMessage());
}
}
}
// Throw an exception if no data chunk has been found
if(!foundData) {
throw new RuntimeException("Did not find a data chunk");
}
// Calculate the scaling factor for converting to a normalised double
if(validBits>8) {
// If more than 8 validBits, data is signed
// Conversion required dividing by magnitude of max negative value
floatOffset = 0;
floatScale = 1 << (validBits - 1);
} else {
// Else if 8 or less validBits, data is unsigned
// Conversion required dividing by max positive value
floatOffset = -1;
floatScale = 0.5 * ((1 << validBits) - 1);
}
bufferPointer = 0;
this.bytesRead = 0;
frameCounter = 0;
ioState = IOState.READING;
}
/**
* Constructor for creating a WavFile object to be written to a file.
* @param filename The filename of the file this object should be written to
* @param numChannels The number of channels of audio
* @param numFrames The number of frames of audio
* @param validBits The number of valid bits
* @param sampleRate The sample rate for the audio samples
*/
public WavFile(String filename, int numChannels, long numFrames, int validBits,
long sampleRate) {
this();
this.file = new File(filename);
this.numChannels = numChannels;
this.numFrames = numFrames;
this.sampleRate = sampleRate;
bytesPerSample = (validBits + 7) / 8;
blockAlign = this.bytesPerSample * numChannels;
this.validBits = validBits;
// Sanity check arguments
if(numChannels<1 || numChannels>65535) {
throw new RuntimeException("Illegal number of channels, valid range 1 to 65536");
}
if(numFrames<0) {
throw new RuntimeException("Number of frames must be positive");
}
if(validBits<2 || validBits>65535) {
throw new RuntimeException("Illegal number of valid bits, valid range 2 to 65536");
}
if(sampleRate<0) {
throw new RuntimeException("Sample rate must be positive");
}
try {
// Create output stream for writing data
oStream = new FileOutputStream(file);
// Calculate the chunk sizes
long dataChunkSize = blockAlign * numFrames;
long mainChunkSize = 4 + // Riff Type
8 + // Format ID and size
16 + // Format data
8 + // Data ID and size
dataChunkSize;
// Chunks must be word aligned, so if odd number of audio data bytes
// adjust the main chunk size
if (dataChunkSize % 2 == 1) {
mainChunkSize += 1;
wordAlignAdjust = true;
} else {
wordAlignAdjust = false;
}
// Set the main chunk size
putLE(RIFF_CHUNK_ID, innerBuffer, 0, 4);
putLE(mainChunkSize, innerBuffer, 4, 4);
putLE(RIFF_TYPE_ID, innerBuffer, 8, 4);
// Write out the header
oStream.write(innerBuffer, 0, 12);
// Put format data in innerBuffer
long averageBytesPerSecond = sampleRate * blockAlign;
putLE(FMT_CHUNK_ID, innerBuffer, 0, 4); // Chunk ID
putLE(16, innerBuffer, 4, 4); // Chunk Data Size
putLE(1, innerBuffer, 8, 2); // Compression Code (Uncompressed)
putLE(numChannels, innerBuffer, 10, 2); // Number of channels
putLE(sampleRate, innerBuffer, 12, 4); // Sample Rate
putLE(averageBytesPerSecond, innerBuffer, 16, 4); // Average Bytes Per Second
putLE(blockAlign, innerBuffer, 20, 2); // Block Align
putLE(validBits, innerBuffer, 22, 2); // Valid Bits
// Write Format Chunk
oStream.write(innerBuffer, 0, 24);
// Start Data Chunk
putLE(DATA_CHUNK_ID, innerBuffer, 0, 4); // Chunk ID
putLE(dataChunkSize, innerBuffer, 4, 4); // Chunk Data Size
// Write Format Chunk
oStream.write(innerBuffer, 0, 8);
} catch (IOException e) {
throw new RuntimeException("Problems with IO: " + e.getMessage());
}
// Calculate the scaling factor for converting to a normalised double
if(this.validBits>8) {
// If more than 8 validBits, data is signed
// Conversion required multiplying by magnitude of max positive value
floatOffset = 0;
floatScale = Long.MAX_VALUE >> (64 - this.validBits);
} else {
// Else if 8 or less validBits, data is unsigned
// Conversion required dividing by max positive value
floatOffset = 1;
floatScale = 0.5 * ((1 << this.validBits) - 1);
}
// Finally, set the IO State
bufferPointer = 0;
bytesRead = 0;
frameCounter = 0;
ioState = IOState.WRITING;
}
public int getNumChannels() {
return numChannels;
}
public long getNumFrames() {
return numFrames;
}
public long getSampleRate() {
return sampleRate;
}
public int getValidBits() {
return validBits;
}
/**
* Gets all of the audio samples for the wav file
* <p>This method should only be called once.</p>
* <p>Returns null if an IO exception was encountered.</p>
* @return All of the audio samples for the wav file or null (if an IOException was thrown)
*/
public ArrayList<Double> getSamples() {
ArrayList<Double> samples = new ArrayList<>();
try {
double[][] buffer = new double[numChannels][BUFFER_SIZE];
int framesRead = 0;
do {
framesRead = readFrames(buffer, BUFFER_SIZE);
for (int frame=0; frame<framesRead; ++frame) {
for (int channel=0; channel<numChannels; ++channel) {
samples.add(buffer[channel][frame]);
}
}
} while (framesRead!=0);
} catch (IOException e) {
samples = null;
}
return samples;
}
/**
* Writes the audio samples passed to the wav file
* <p>This method should only be called once.</p>
* @param samples The audio samples for the wav file
* @return returns true if successful, false if not (IOException was encountered)
*/
public boolean setSamples(ArrayList<Double> samples) {
double[] buffer = new double[samples.size()];
for(int i=0; i<buffer.length; ++i) {
buffer[i] = samples.get(i);
}
boolean successful = true;
try{
writeFrames(buffer, samples.size()/numChannels);
} catch (IOException e) {
successful = false;
}
return successful;
}
/**
* Frees up resources associated with the object and releases
* the file associated with the object
* @return returns true if successful, false if not (IOException was encountered)
*/
public boolean close() {
boolean successful = true;
// Close the input stream and set to null
if(iStream!=null) {
try {
iStream.close();
} catch (IOException e) {
successful = false;
}
iStream = null;
}
if(oStream!=null) {
try {
// Write out anything still in the innerBuffer
if (bufferPointer > 0) {
oStream.write(innerBuffer, 0, bufferPointer);
}
// If an extra byte is required for word alignment, add it to the end
if (wordAlignAdjust) {
oStream.write(0);
}
} catch (IOException e) {
successful = false;
}
try {
oStream.close();
} catch (IOException e) {
successful = false;
}
oStream = null;
}
ioState = IOState.CLOSED;
return successful;
}
@Override
public String toString() {
return "File: " + file
+ "\nChannels: " + numChannels + ", Frames: " + numFrames
+ "\nIO State: " + ioState
+ "\nSample Rate: " + sampleRate + ", Block Align: " + blockAlign
+ "\nValid Bits: " + validBits + ", Bytes per sample: " + bytesPerSample;
}
// Get and Put little endian data from innerBuffer
// ------------------------------------------------
/**
* Get little endian data from the innerBuffer
* @param buffer The buffer with little endian data
* @param position Position in the buffer
* @param numBytes Number of bytes to be converted to a long
* @return The little endian representation of data from the buffer
*/
private static long getLE(byte[] buffer, int position, int numBytes) {
--numBytes;
position += numBytes;
long value = buffer[position] & 0xFF;
for(int b=0; b<numBytes; b++) {
value = (value << 8) + (buffer[--position] & 0xFF);
}
return value;
}
/**
* Put the little endian data into the buffer
* @param value Value to be placed into the buffer
* @param buffer The buffer with the little endian data
* @param position Position in the buffer
* @param numBytes Number of bytes to be converted from the long
*/
private static void putLE(long value, byte[] buffer, int position, int numBytes) {
for(int b=0; b<numBytes; b++) {
buffer[position] = (byte)(value & 0xFF);
value >>= 8;
++position;
}
}
/**
* Get the number of frames left to read or write.
* @return The number of frames that have not been processed
*/
private long getFramesRemaining() {
return numFrames - frameCounter;
}
/**
* Read audio data from the wav file.
* @param sampleBuffer Buffer to hold sample data
* @param numFramesToRead Maximum number of frames to read
* @return The number of frames actually read
* @throws IOException Thrown if an input error is encountered
*/
private int readFrames(double[][] sampleBuffer, int numFramesToRead) throws IOException {
if(ioState != IOState.READING) {
throw new IOException("Cannot read from WavFile instance");
}
int offset = 0;
numFramesToRead = (int)Math.min(numFramesToRead, getFramesRemaining());
for(int frame=0; frame<numFramesToRead; ++frame) {
for(int channel=0; channel<numChannels; ++channel) {
sampleBuffer[channel][offset] = floatOffset + (double)readSample() / floatScale;
}
++offset;
++frameCounter;
}
return numFramesToRead;
}
/**
* Reads one audio sample from the wav file.
* @return The value of the audio sample
* @throws IOException Thrown if an input error is encountered
*/
private long readSample() throws IOException {
long value = 0;
for(int b=0; b<bytesPerSample; b++) {
if(bufferPointer == bytesRead) {
int read = iStream.read(innerBuffer, 0, BUFFER_SIZE);
if(read == -1) {
throw new RuntimeException("Not enough data available");
}
bytesRead = read;
bufferPointer = 0;
}
int val = innerBuffer[bufferPointer];
if(b<bytesPerSample-1 || bytesPerSample==1) {
val &= 0xFF;
}
value += val << (b * 8);
bufferPointer++;
}
return value;
}
/**
* Write audio data to the wav file.
* @param sampleBuffer Samples to be written to the file
* @param numFramesToWrite Maximum number of frames to write
* @return The number of frames actually written
* @throws IOException Thrown if an output error is encountered
*/
private int writeFrames(double[] sampleBuffer, int numFramesToWrite) throws IOException {
if(ioState != IOState.WRITING) {
throw new IOException("Cannot write to WavFile instance");
}
int offset = 0;
numFramesToWrite = (int)Math.min(numFramesToWrite, getFramesRemaining());
for(int frame=0; frame<numFramesToWrite; ++frame) {
for(int channel=0; channel<numChannels; ++channel) {
writeSample((long)(floatScale * (floatOffset + sampleBuffer[offset])));
++offset;
}
++frameCounter;
}
return numFramesToWrite;
}
/**
* Writes one audio sample to the wav file.
* @param value The value of the audio sample
* @throws IOException Thrown if an output error is encountered
*/
private void writeSample(long value) throws IOException {
for(int b=0; b<bytesPerSample; b++) {
if(bufferPointer==BUFFER_SIZE) {
oStream.write(innerBuffer, 0, BUFFER_SIZE);
bufferPointer = 0;
}
innerBuffer[bufferPointer] = (byte)(value & 0xFF);
value >>= 8;
++bufferPointer;
}
}
}