tim/prune/data/AudioFile.java

   1 package tim.prune.data;
   2
   3 import java.io.File;
   4 import javax.sound.sampled.AudioFileFormat;
   5 import javax.sound.sampled.AudioSystem;
   6
   7 /**
   8  * Class to represent an audio file for correlation
   9  */
  10 public class AudioFile extends MediaFile
  11 {
  12         /** length of current audio file in seconds */
  13         private int _lengthInSeconds = LENGTH_UNKNOWN;
  14
  15         private static final int LENGTH_UNKNOWN = -1;
  16         private static final int LENGTH_NOT_AVAILABLE = -2;
  17
  18         /**
  19          * Constructor
  20          * @param inFile file object
  21          */
  22         public AudioFile(File inFile)
  23         {
  24                 // Timestamp is always just taken from the file modification stamp
  25                 super(inFile, new Timestamp(inFile.lastModified()));
  26         }
  27
  28         /**
  29          * @return length of this audio file in seconds
  30          */
  31         public int getLengthInSeconds()
  32         {
  33                 if (_lengthInSeconds == LENGTH_UNKNOWN)
  34                 {
  35                         try {
  36                                 AudioFileFormat format = AudioSystem.getAudioFileFormat(getFile());
  37                                 _lengthInSeconds = (int) (format.getFrameLength() / format.getFormat().getFrameRate());
  38                         }
  39                         catch (Exception e) {
  40                                 _lengthInSeconds = LENGTH_NOT_AVAILABLE;
  41                         }
  42                 }
  43                 return _lengthInSeconds;
  44         }
  45 }