/** * Class that represents a sound. This class is used by the students * to ext
ID: 3866613 • Letter: #
Question
/**
* Class that represents a sound. This class is used by the students
* to extend the capabilities of SimpleSound.
*
* Copyright Georgia Institute of Technology 2004
* @author Barbara Ericson ericson@cc.gatech.edu
*/
public class Sound extends SimpleSound
{
/////////////// consructors ////////////////////////////////////
/**
* Constructor that takes a file name
* @param fileName the name of the file to read the sound from
*/
public Sound(String fileName)
{
// let the parent class handle setting the file name
super(fileName);
}
/**
* Constructor that takes the number of seconds that this
* sound will have
* @param numSeconds the number of seconds desired
*/
public Sound (int numSeconds)
{
// let the parent class handle this
super(numSeconds);
}
/**
* Constructor that takes a sound to copy
*/
public Sound (Sound copySound)
{
// let the parent class handle this
super(copySound);
}
////////////////// methods ////////////////////////////////////
/**
* Method to return the string representation of this sound
* @return a string with information about this sound
*/
public String toString()
{
String output = "Sound";
String fileName = getFileName();
// if there is a file name then add that to the output
if (fileName != null)
output = output + " file: " + fileName;
// add the length in frames
output = output + " number of samples: " + getLengthInFrames();
return output;
}
} // end of class Sound, put all new methods before this
Add a static main method to the Sound class, and inject code into it that demonstrates the operation of the methods that you subsequently add to the Sound class, as specified below.
Add the increaseVolume method, but write it such that it uses a for-each loop.
Add a halvePosDoubleNeg method that halves the volume of positive values and doubles the volume of negative values
Make an audio collage. Make it at least five seconds long, and include at least two different sounds (e.g., sounds from different files). Make a copy of one of those different sounds and mirror it. Splice together the original two sounds and the modified sound to make the complete audio collage. Your program should write the collage file out to the disk.
Submit the Sound.java file, along with the sound files used and collage sound file created. Submit these files together as a single zipped attachment. Please use the zip format (not .rar or any other format).
Explanation / Answer
public class Sound extends SimpleSound
{
/////////////// consructors ////////////////////////////////////
/**
* Constructor that takes a file name
* @param fileName the name of the file to read the sound from
*/
public Sound(String fileName)
{
// let the parent class handle setting the file name
super(fileName);
}
/**
* Constructor that takes the number of samples in
* the sound
* @param numSamples the number of samples desired
*/
public Sound (int numSamples)
{
// let the parent class handle this
super(numSamples);
}
/**
* Constructor that takes the number of samples that this
* sound will have and the sample rate
* @param numSamples the number of samples desired
* @param sampleRate the number of samples per second
*/
public Sound (int numSamples, int sampleRate)
{
// let the parent class handle this
super(numSamples,sampleRate);
}
/**
* Constructor that takes a sound to copy
*/
public Sound (Sound copySound)
{
// let the parent class handle this
super(copySound);
}
////////////////// methods ////////////////////////////////////
// Assignment Week 05
/*************************************************
* Task 1 : Increase volume method
* using a for-each loop
*/
// Task 1: write increaseVolume() using for-each loop
// yes it should be removed for cleaner code.
public void increaseVolume()
{
SoundSample[] soundArray = this.getSamples();
// for-each loop
for (SoundSample sample : soundArray)
{
// increase volume by multiplier of 2
sample.setValue(sample.getValue() * 2);
}
}
// demonstration of reuse or (better use of) code; learnt from your remarks in Assignment 3
public void increaseVolume2()
{
increaseVolume(2);
}
public void increaseVolume(int multiplier)
{
SoundSample[] soundArray = this.getSamples();
int value = 0;
// for-each loop
for (SoundSample sample : soundArray)
{
// get sample rate
value = sample.getValue();
// add multiplier
value = value * multiplier;
// Limiter function: apply limits to prevent clipping
if ( value > 32764 ) // don't go right to the limit 32767
{
// limit extreme +ve values
sample.setValue(32760);
}
else if ( value < -32764 ) // don't go right to the limit -32768
{
// limit extreme -ve values
sample.setValue(-32760);
}
else if(value < 32767 && value > -32768 )
{
// set acceptable values within audible limits
sample.setValue(value);
}
}
}
/*********************************************************
* Task 2: halvePosDoubleNeg - halves the volume of positive
* values and doubles the volume of negative values
*/
public void halvePosDoubleNeg()
{
SoundSample[] soundArray = this.getSamples();
SoundSample sample = null;
int index = 0;
// loop through the wav file
while ( index < soundArray.length )
{
// create an array for the sound
sample = soundArray[index];
// apply alterations +ve * 0.5 & -ve * 2
if ( sample.getValue() >= 0 )
{
// ------------debug code left in on purpose-----------
//System.out.print(sample.getValue() + " " + (int)(sample.getValue() * 0.5) + " ");
sample.setValue((int)(sample.getValue() * 0.5));
}
else if (sample.getValue() < 0)
{
// ------------debug code left in on purpose-----------
//System.out.print(sample.getValue() + " " + (sample.getValue() * 2) + " ");
sample.setValue(sample.getValue() * 2);
}
index++;
}
}
/************************************************
* Task 3: Collage Methods
*
* Make a mirror method
*
*/
public void mirror(Sound source, int targetStart)
{
int length = source.getLength();
int value = 0;
// loop from 0 to mirror point
for ( int i = 0; i < source.getLength(); i++)
{
value = source.getSampleValueAt(i);
this.setSampleValueAt(targetStart + length - 1 - i, value);
}
}
/*
* Create a Sound Clip
*/
public void clip(int start, int end)
{
// calculate the number of samples in the clip
int lengthInSamples = end - start + 1;
Sound target = new Sound(lengthInSamples + start); // hold clip
// copy from start to end from source into target
for ( int i = start; i <= end; i++)
{
target.setSampleValueAt(i, this.getSampleValueAt(i));
}
}
/*
* Clear the sound from a file to use as a blank slate
*/
public void clear()
{
SoundSample[] sourceArray = this.getSamples();
for ( SoundSample sound : sourceArray )
{
sound.setValue(0);
}
}
/*
* clipEdit: play only the supplied start and end points, and the
* target location
*/
public void clipEdit(Sound source, int sourceStart, int sourceStop, int targetStart)
{
// loop copying from source to target
for ( int index = sourceStart, targetIndex = targetStart;
index < sourceStop && targetIndex < this.getLength();
index++, targetIndex++)
{
this.setSampleValueAt(targetIndex, source.getSampleValueAt(index));
}
}
/*
* Splicer, play the individual clips
*/
public void splicer(Sound clip1, Sound clip2, Sound clip3)
{
// Helloworld.wav: "hello"
clipEdit(clip1,2704,14892,0);
// Helloworld.wav: "hello"
clipEdit(clip1,2704,14892,14892);
// Helloworld.wav: "hello world"
clipEdit(clip1,2704,35156,29784);
// Thisisatest.wav: "this is a"
clipEdit(clip2,0,43600, 62236);
// fun.wav: "fun"
clipEdit(clip3,0,11134,105836);
// fun.wav: "nuf"
mirror(clip3,116970);
// Thisisatest.wav: "test"
clipEdit(clip2,43600,60800,129715);
}
/**
* Method to return the string representation of this sound
* @return a string with information about this sound
*/
public String toString()
{
String output = "Sound";
String fileName = getFileName();
// if there is a file name then add that to the output
if (fileName != null)
output = output + " file: " + fileName;
// add the length in frames
output = output + " number of samples: " + getLengthInFrames();
return output;
}
public static void main(String[] args)
{
/*
* Assignment 05:
* Create sound object for 3 tasks and assign a sound file to it
*/
// General Setting Changes: change this for your own location to write the files to.
String writeLocation = "/Users/Shared/Java-Libraries/CourseCD/results/";
/*
// Task 1: increaseVolume + increaseVolume wit multiplication factor
Sound soundTask1 = new Sound(FileChooser.getMediaPath("thisisatest.wav"));
soundTask1.explore();
soundTask1.increaseVolume2(); // not the best use of code, but here to demonstrate reuse of methods
soundTask1.play();
soundTask1.explore();
soundTask1.write(writeLocation + "Assignment05-Task1.wav");
*/
/*
// Task 2: alter volume, +ve waveform increases by half, -ve waveform increases by 2.0
// NB: I realize I could have created the limiter from above as a method and
// reused it here, but I just ran out of time.
Sound soundTask2 = new Sound(FileChooser.getMediaPath("thisisatest.wav"));
soundTask2.explore();
soundTask2.halvePosDoubleNeg();
soundTask2.play();
soundTask2.explore();
soundTask2.write(writeLocation + "Assignment05-Task2.wav");
*/
/*
* Task 3: Make an audio collage;
* - at least 5 seconds long
* - at least 2 different sounds (from different files)
* - Make copy of one sound and mirror it
* - Splice together the original sounds and generate a single output file
* - write to disk
*/
/*
* Comments Notes, I moved the sound files here, thinking that
* this would be a more centralized location for re-using the splicer method
* but realized after that the splicer method contained such specific settings
* for the individual wave samples that this really defeats the purpose
* of reusing methods.
*/
/*
// Task 3
Sound task3Source = new Sound(FileChooser.getMediaPath("gettysburg.wav"));
Sound clip1 = new Sound(FileChooser.getMediaPath("helloWorld.wav"));
Sound clip2 = new Sound(FileChooser.getMediaPath("thisisatest.wav"));
Sound clip3 = new Sound(FileChooser.getMediaPath("fun.wav"));
// create a blank soundscape
task3Source.clear();
// splice 3x clips
task3Source.splicer(clip1, clip2, clip3);
// play result
task3Source.play();
// write result to disk
task3Source.write(writeLocation + "Assignment05-Task3.wav");
*/
}
} // this } is the end of class Sound, put all new methods before this
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