filesample.java

Java version of ABC/HR comparator v0.5. by schnofler. Runs on Sun JRE 1.5 or later

package abchr.audio;

import abchr.SampleHash;

import javax.sound.sampled.*;
import java.io.*;
import java.util.*;
import java.security.NoSuchAlgorithmException;

public class FileSample extends AbstractSample {
	static final long serialVersionUID = 943445419982345098L;

	private static final int DATA_MAGIC = 0x64617461;

	private AudioFormat format=null;
	private File wave=null;
	private float length;

	private boolean checkHash(byte[] hash) throws IOException {
		byte[] sampleHash=new byte[0];
		try {
			sampleHash=SampleHash.computeHash(wave,"SHA");
		} catch(NoSuchAlgorithmException e) {
			return false;
		}
		return Arrays.equals(sampleHash,hash);
	}

	public boolean checkHash() throws IOException {
		if(!SampleHash.hashPresent(this)){return true;}
		return checkHash(SampleHash.getHash(this));
	}

	public FileSample(File file) throws IOException,UnsupportedAudioFileException {
		this.wave=file;
		initialize();
	}

	private void initialize() throws UnsupportedAudioFileException,IOException {
		AudioFileFormat fileFormat=AudioSystem.getAudioFileFormat(wave);
		format=fileFormat.getFormat();
		AudioInputStream stream=AudioSystem.getAudioInputStream(wave);
		length=stream.getFrameLength()/format.getFrameRate();
		if(length<2) {
			long byteLength=0;
			while(stream.available()>0) {
				byteLength+=stream.skip((stream.available()/format.getFrameSize())*format.getFrameSize());
			}
			long frameLength=byteLength/format.getFrameSize();
			length=frameLength/format.getFrameRate();
		}
		stream.close();
		InputStream istream=new FileInputStream(wave);
		DataInputStream dataStream=new DataInputStream(istream);
		int k=0;
		try {
			int i;
			for(i=0;;i++) {
				k=dataStream.readInt();
				if(k==DATA_MAGIC) {
					dataStream.readLong();
					skipBytes=(i+1)*4;
					break;
				}
			}
		} catch(EOFException e) {
			throw new UnsupportedAudioFileException();
		} finally {
			dataStream.close();
		}
	}

	public AudioFormat getFormat(){return format;}

	int skipBytes;

	public AudioInputStream getStream() {
		try {
			InputStream stream=new FileInputStream(wave);
			stream.skip(skipBytes);
			return new AudioInputStream(stream,format,(int)(length*format.getFrameRate()));
		} catch(IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	public File getWave(){return wave;}

	public float getLength(){return length;}
	public void setLength(float length){this.length=length;}

	public String toString() {
		return wave.getName();
	}
}