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POTrim beginning and end from a WAV file with the Java sound API
 

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  1. POTrim beginning and end from a WAV file with the Java sound API
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    <p>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.</p> <p>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).</p> <pre><code>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&lt;nLength){ tempBuffer=new byte[nLength]; } int bytesRead=0; if(t_bytesRead&lt;startByte){ do{//skip to starting byte bytesRead=(int)skip(startByte-t_bytesRead); t_bytesRead+=bytesRead; }while(t_bytesRead&lt;startByte); } if(t_bytesRead&gt;=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&gt;=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")); } } </code></pre> <p>I simply cannot find anything wrong with it. I did find a similar post on here that linked to <a href="https://forums.oracle.com/forums/thread.jspa?threadID=2136229&amp;tstart=0" rel="nofollow">https://forums.oracle.com/forums/thread.jspa?threadID=2136229&amp;tstart=0</a>. 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.</p>
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