I have the basics made. However, the output file just repeats the WAV headerbytes over and over. The resulting file is the right size, but it is filed with junk.
I am trying to use a class that extends AudioInputStream so that I can use it seamlessly with other code that will mix it with another AudioInputStream(which works beautifully).
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
public class TrimmerAIS extends AudioInputStream{
private final AudioInputStream stream;
private final long startByte,endByte;
private long t_bytesRead=0;
public TrimmerAIS(AudioFormat audioFormat,AudioInputStream audioInputStream,long startMilli,long endMilli){
super(new ByteArrayInputStream(new byte[0]),audioFormat,AudioSystem.NOT_SPECIFIED);
stream=audioInputStream;
//startByte=(long)((startMilli/1000f)*stream.getFormat().getSampleRate()*stream.getFormat().getSampleSizeInBits()*stream.getFormat().getChannels())/8;
//endByte=(long)((endMilli/1000f)*stream.getFormat().getSampleRate()*stream.getFormat().getSampleSizeInBits()*stream.getFormat().getChannels())/8;
startByte=(long)((startMilli/1000)*stream.getFormat().getFrameRate()*stream.getFormat().getFrameSize());
endByte=(long)((endMilli/1000)*stream.getFormat().getFrameRate()*stream.getFormat().getFrameSize());
}
private byte[] tempBuffer;
@Override
public int available() throws IOException{
return (int)(endByte-startByte-t_bytesRead);
}
public int read(byte[] abData,int nOffset,int nLength) throws IOException{
// set up the temporary byte buffer
if(tempBuffer==null||tempBuffer.length<nLength){
tempBuffer=new byte[nLength];
}
int bytesRead=0;
if(t_bytesRead<startByte){
do{//skip to starting byte
bytesRead=(int)skip(startByte-t_bytesRead);
t_bytesRead+=bytesRead;
}while(t_bytesRead<startByte);
}
if(t_bytesRead>=endByte){
return -1;
}
bytesRead=stream.read(tempBuffer,0,nLength);
if(bytesRead==-1){//premature EOF
return -1;
}else if(bytesRead==0){
return 0;
}
t_bytesRead+=bytesRead;
if(t_bytesRead>=endByte){//correct bytes read to exclude any bytes over the limit
bytesRead=(int)(bytesRead-(t_bytesRead-endByte));
}
return bytesRead;
}
public static void main(String[] args) throws UnsupportedAudioFileException, IOException{
AudioInputStream music=null;
music = AudioSystem.getAudioInputStream(new File("music/0.wav"));
music=new TrimmerAIS(music.getFormat(),music,0,15000);
AudioSystem.write(music,AudioFileFormat.Type.WAVE,new File("out.wav"));
}
}
I simply cannot find anything wrong with it. I did find a similar post on here that linked to https://forums.oracle.com/forums/thread.jspa?threadID=2136229&tstart=0. Which is what mine does except that you give it the start and end positions in milliseconds and it can be passed on to/wrapped in another AIS or output without the need to read the segment wanted into an array and then writing it. Been trying to figure this out for the past 3 hours and my mind is a little fried. So if something doesn't make sense, feel free to ask for clarification. I would prefer to not parse the file but if I have to I have to.
Heh, whoops! Just needed to remove tempBuffer and replace it with abData. Was a long day. Below is the corrected code. Thought about deleting this since it was a simple mistake, but the only reason I made this class is because it does not already exist.
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
public class TrimmerAIS extends AudioInputStream{
private final AudioInputStream stream;
private final long startByte,endByte;
private long t_bytesRead=0;
public TrimmerAIS(AudioFormat audioFormat,AudioInputStream audioInputStream,long startMilli,long endMilli){
super(new ByteArrayInputStream(new byte[0]),audioFormat,AudioSystem.NOT_SPECIFIED);
stream=audioInputStream;
//calculate where to start and where to end
startByte=(long)((startMilli/1000)*stream.getFormat().getFrameRate()*stream.getFormat().getFrameSize());
endByte=(long)((endMilli/1000)*stream.getFormat().getFrameRate()*stream.getFormat().getFrameSize());
}
@Override
public int available() throws IOException{
return (int)(endByte-startByte-t_bytesRead);
}
public int read(byte[] abData,int nOffset,int nLength) throws IOException{
int bytesRead=0;
if(t_bytesRead<startByte){
do{
bytesRead=(int)skip(startByte-t_bytesRead);
t_bytesRead+=bytesRead;
}while(t_bytesRead<startByte);
}
if(t_bytesRead>=endByte)//end reached. signal EOF
return -1;
bytesRead=stream.read(abData,0,nLength);
if(bytesRead==-1)
return -1;
else if(bytesRead==0)
return 0;
t_bytesRead+=bytesRead;
if(t_bytesRead>=endByte)// "trim" the extra by altering the number of bytes read
bytesRead=(int)(bytesRead-(t_bytesRead-endByte));
return bytesRead;
}
public static void main(String[] args) throws UnsupportedAudioFileException, IOException{
AudioInputStream music=null;
music = AudioSystem.getAudioInputStream(new File("music/0.wav"));
music=new TrimmerAIS(music.getFormat(),music,0,15000);
AudioSystem.write(music,AudioFileFormat.Type.WAVE,new File("out.wav"));
}
}