Writing au files with ulaw encoding is broken




java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)
Java HotSpot(TM) Client VM (build 1.3.0, mixed mode)


This code should convert the input file and write as an ulaw encoded AU file:

AudioInputStream ais = AudioSystem.getAudioInputStream(new File("pcm.wav"));
ais = AudioSystem.getAudioInputStream(AudioFormat.Encoding.ULAW, ais);
AudioSystem.write(ais, AudioFileFormat.Type.AU, new File("ulaw.au"));

However, an exception is thrown. The problem can be traced to
com.sun.media.sound.AuFileWriter:271 and following lines: when the input format
is not big endian, it is tried to convert it to some PCM format, which doesn't
make any sense, as the input stream is ulaw and with ulaw, endianness doesn't
matter. Constructing an output AudioFormat instance with bigendian=true and
using AudioSystem.getAudioInputStream(AudioFormat, AudioInputStream) doesn't
throw an exception (as no conversion is tried in AuFileWriter), but the
resulting file is not properly transformed to ulaw. This is another bug.
(Review ID: 112555) 
======================================================================

***
The following test case was used to verify this bug:

import javax.sound.sampled.*;
import java.io.*;

public class bug4391108 
{
public static void main(String args[])
{
try{
	AudioInputStream ais = AudioSystem.getAudioInputStream(new File("blues1.wav"));
	ais = AudioSystem.getAudioInputStream(AudioFormat.Encoding.ULAW, ais);
	File out = new File("ulaw.au");
	int t = AudioSystem.write(ais, AudioFileFormat.Type.AU, out);
	AudioFileFormat format = AudioSystem.getAudioFileFormat(out);
	System.out.println(format);
	AudioFileFormat.Type type = format.getType();
	System.out.println(type);
	}
	catch(Exception e)
	{ e.printStackTrace();
	}
}
}


Above code gives the following exception:

java.lang.IllegalArgumentException: Unsupported conversion: ULAW from PCM_UNSIGN
ED, 8000.0 Hz, 8 bit, mono, audio data
        at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:
445)
        at bug4391108.main(bug4391108.java:12)

***
 xxxxx@xxxxx  2001-08-16


 xxxxx@xxxxx  2001-08-20
The bug still failed on Xhipra's test case.

none to get the desired ulaw-encoded AU file.
======================================================================

This is very basic functionality of Java Sound and should be fixed soon.

 xxxxx@xxxxx  2001-10-01
	Should be fixed in Merlin. Need to be verified. Push to Hopper.


 xxxxx@xxxxx  2002-04-16
	Had been indeed fixed for Merlin.