| Listing 7 . Beginning of the class named MusicComposer10. |
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public class MusicComposer10{
//Instantiate an object containing audio format parameters with predefined// values. They may be modified by the signal generator at runtime. Values
// allowed by Java SDK 1.4.1 are shown in comments in the class definition.AudioFormatParameters01 audioParams = new AudioFormatParameters01();//A buffer to hold the audio data that will be played or filed.
byte[]melody;//A place to store the incoming args array.
String[]args;
//-------------------------------------------------------------------------////Command-line parameter (three parameters required)
//0 - If "play", the sound will be played immediately. Otherwise, the string// will be used as a filename for an audio file of type AU. In the latter
// case, it must be a string that would be valid as a file name for the// operating system in use.
//1 - Output pulses per second//2 - Input file namepublic static void main(String[] args){//Instantiate a new object of this class.
new MusicComposer10(args);}//end main |
The constructor for the class named MusicComposer10
The constructor for the class named MusicComposer10 is provided in Listing 8 . There is nothing new or unusual about this code so it shouldn't require further explanation.
| Listing 8 . The constructor for the class named MusicComposer10. |
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public MusicComposer10(String[] args){//constructor//Save the args array.
this.args = args;//Create default args data if no args data is provided on the command line.if(args.length == 0){
this.args = new String[3];
this.args[0]= "play";//Play the melody immediately
this.args[1]= "6";//Pulses per minute
this.args[2]= "TestData01.txt";
}//end if//Get a populated array containing audio data.
AudioGraph01 audioGraph01 = new AudioGraph01(audioParams,this.args,melody);melody = audioGraph01.getMelody();
//Play or file the audio datanew AudioPlayOrFile01(audioParams,melody,this.args[0]).playOrFileData();}//end constructor
//-------------------------------------------------------------------------//}//end class MusicComposer10.java |
Listing 8 also signals the end of the class named MusicComposer10.
The class named AudioGraph01
A general purpose AudioGraph generator program
AudioGraph01 is a general purpose AudioGraph program that reads an input text file containing numeric values for y as a function of equally spaced values for xand produces an output melody that represents a graph of that data. The values for y are read as a comma-delimited list of values and are treated as type double . The name of the text file is input as a command-line parameter.
The input text file
The text file must be stored in a subfolder named Data that is a child of the folder containing the compiled program. The text file may be created manuallyusing a simple text editor or it may be created as the output of a program that evaluates a function.
Space characters are not allowed in the data.