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Last Update : 10/03/2005

 

What is Ogg Vorbis ?
"Ogg Vorbis is a fully Open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for high quality (44.1-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel. This places Vorbis in the same class as audio representations including MPEG-1 audio layer 3, MPEG-4 audio (AAC and TwinVQ), and PAC". Extract from OggVorbis homepage.
In addition to friendly license, sound quality is better for similar MP3 file size and decoding algorithm implementation is faster.

How to install Vorbis SPI ?
Add vorbisspi1.0.2.jar, tritonus_share.jar, jorbis-0.0.15.jar, jogg-0.0.7.jar into
your CLASSPATH.

How to play Ogg Vorbis file with Vorbis SPI ?
You have to use JavaSound API. Here is a sample below :
(Sample source code is available in scrtest/ folder included in VorbisSPI package)
 

[...]
public void testPlay(String filename)
{
  try
  {
    File file = new File(filename);
    // Get AudioInputStream from given file.	
    AudioInputStream in= AudioSystem.getAudioInputStream(file);
    AudioInputStream din = null;
    if (in != null)
    {
        AudioFormat baseFormat = in.getFormat();
        AudioFormat  decodedFormat = new AudioFormat(
                AudioFormat.Encoding.PCM_SIGNED,
                baseFormat.getSampleRate(),
                16,
                baseFormat.getChannels(),
                baseFormat.getChannels() * 2,
                baseFormat.getSampleRate(),
                false);
         // Get AudioInputStream that will be decoded by underlying VorbisSPI
        din = AudioSystem.getAudioInputStream(decodedFormat, in);
        // Play now !
        rawplay(decodedFormat, din);
        in.close();		
    }
  }
  catch (Exception e)
  {
    e.printStackTrace();
  }
}

private void rawplay(AudioFormat targetFormat, 
AudioInputStream din) throws IOException, LineUnavailableException { byte[] data = new byte[4096]; SourceDataLine line = getLine(targetFormat); if (line != null) { // Start line.start(); int nBytesRead = 0, nBytesWritten = 0; while (nBytesRead != -1) { nBytesRead = din.read(data, 0, data.length); if (nBytesRead != -1) nBytesWritten = line.write(data, 0, nBytesRead); } // Stop line.drain(); line.stop(); line.close(); din.close(); } }
private SourceDataLine getLine(AudioFormat audioFormat) throws LineUnavailableException { SourceDataLine res = null; DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat); res = (SourceDataLine) AudioSystem.getLine(info); res.open(audioFormat); return res; } [...]

How to play Ogg Vorbis URL or Icecast stream with Vorbis SPI ?
It's the same as sample above. Just replace :

File file = new File(filename);

by :
URL file = new URL(stream_or_url);

How to play get Ogg Vorbis file properties and comments ?
There are AudioFormat properties and AudioFileFormat properties.
Most interesting properties and comments are available in AudioFileFormat instance. Here is a sample below :

import org.tritonus.share.sampled.file.TAudioFileFormat
[...] public void readProperties(String filename) { try { File file = new File(filename); // Get AudioFileFormat from given file. AudioFileFormat baseFileFormat baseFileFormat = AudioSystem.getAudioFileFormat(file); if (baseFileFormat instanceof TAudioFileFormat) {
Map props = ((TAudioFileFormat)baseFileFormat).properties();
// Length in seconds
long length = (long) Math.round((((Long)props.get("duration")).longValue())/1000000); // Title of song (comment)
String title = (String)props.get("title"); // Nominal bitrate in bps
int nominalbitrate = ((Integer)props.get("ogg.bitrate.nominal.bps")).intValue(); // Sampling rate in hz int rate = ((Integer)props.get("ogg.frequency.hz")).intValue(); // and so on ... check Javadoc or readme.txt for all properties (around 20) } catch (Exception e) { e.printStackTrace(); } } [...]

Where is the list of all available properties ?
Check out JavaDoc or readme.txt to find out all updated properties. Here is an extract of AudioFileFormat properties :

     + Standard parameters :
- duration : [Long], duration in microseconds.
- title : [String], Title of the stream.
- author : [String], Name of the artist of the stream.
- album : [String], Name of the album of the stream.
- date : [String], The date (year) of the recording or release of the stream.
- copyright : [String], Copyright message of the stream.
- comment : [String], Comment of the stream.
+ Extended Ogg Vorbis parameters :
- ogg.length.bytes : [Integer], length in bytes.
- ogg.bitrate.min.bps : [Integer], minimum bitrate.
- ogg.bitrate.nominal.bps : [Integer], nominal bitrate.
- ogg.bitrate.max.bps : [Integer], maximum bitrate.
- ogg.channels : [Integer], number of channels 1 : mono, 2 : stereo.
- ogg.frequency.hz : [Integer], sampling rate in hz.
- ogg.version : [Integer], version.
- ogg.serial : [Integer], serial number.
- ogg.comment.track : [String], track number.
- ogg.comment.genre : [String], genre field.
- ogg.comment.encodedby : [String], encoded by field.
- ogg.comment.ext : [String], extended comments (indexed):
For instance :
ogg.comment.ext.1=Something
ogg.comment.ext.2=Another comment


- Links -

Players & Cie

OggVorbis - Project homepage.
JOrbis - 100% Java implementation.
Ogg Vorbis Tutorial - Good starting point.
OV Player - Linux player (GPL).
jOggPlayer - Java Graphical player (GPL).
Vorbissimo - All Vorbis plugins.
WinVorbis - Encoder + comments editor.

Misc

Project Mayhem - The best audio forums.
Icecast - Ogg Vorbis streams.
Xiph.org - Xiphophorus homepage.

Tritonus.org - JavaSound resources.
JavaSound-Interest - Mailing list.



 
 
 

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