Recent changes to bugs

MixingAudioInputStream does not indicate end of stream.

Anonymous — Thu, 31 Dec 2009 16:21:36 -0000

Writing a given MixingAudioInputStream to a file with AudioSystem.write(AudioInputStream stream, AudioFileFormat.Type t, File f) never terminates.
public int read(byte[] abData, int nOffset, int nLength) method never returns -1 to indicate end of all streams.

AudioCovnerter ulaw to alaw conversion error

Anonymous — Tue, 31 Oct 2006 11:42:36 -0000

Hi,

Trying to convert a mu-law (ULAW) wav file to a-law I
get a "format conversion not supported" error, details:
Source in.wav:
Type: WAVE
AudioFormat: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame
AudioConverter arguments:
"-e ALAW -f 8000 in.wav out.wav"

Following seems to work:
Change AudioCovnerter.java line nr +/- 321 (in method
main()):
/* Step 1: convert to PCM, if necessary.
*/
if (! AudioCommon.isPcm(format.getEncoding()))

New code:

    /\* Step 1: convert to PCM, if necessary.
    \*/
    if

(!format.getEncoding().equals(AudioFormat.Encoding.ULAW)
&& ! AudioCommon.isPcm(format.getEncoding()))

Mostapha al Mourabit

Clipping in OscillatorPlayer

Anonymous — Tue, 05 Sep 2006 22:08:21 -0000

Thank you for making your Java Source Resourses
available. The Web page
http://www.jsresources.org/examples/
OscillatorPlayer.html
states that this program has a bug; namely:
Full-scale waves can lead to clipping. It is
currently not known which component is responsible
for this.
The problem is caused by line 82 of the file
Oscillator.java:
fAmplitude = (float) (fAmplitude *
Math.pow(2, getFormat().getSampleSizeInBits()
- 1));
For a "full-scale wave"--i.e., fAmplitude originally
1--the new value of fAmplitude that results from this
line is
Math.pow(2, getFormat().getSampleSizeInBits() - 1))
--viz., 2 raised to the power
getFormat().getSampleSizeInBits() - 1.
Roughly put, the subtraction of 1 here has the desired
effect allotting half of the quantization levels to
the positive values of the signal, and the other half
to the negative values; however, it does not account
for a quantization level also being allotted to a
signal level of zero. Accordingly, either the
positive or negative half of the quantizer actually
has one fewer level allotted to it. A simple fix is
to scale the signal into the quantizer as if both
positive and negative signal values are allotted one
fewer level; that is, replace line 82 with
fAmplitude = (float) (fAmplitude *
(Math.pow(2, getFormat().getSampleSizeInBits()
- 1) - 1));
I have tested this modification with fAmplitude = 1,
and no distortion results.

By the way, the headers of both of the files
OscillatorPlayer.java and Oscillator.java state "this
code is formatted to fit into 80 columns"; but, it is
easily seen that this is not the case.

Jerome Breitenbach
jbreiten@calpoly.edu

midiplayer resources incomplete

Andreas Voss — Mon, 21 Feb 2005 07:22:57 -0000

When I start the midiplayer I get error messages like

Fatal error: resource key toggleChannelViewAction not
found. You may need to override the locale

I tried german and US locale, the missing properties
differ but it seems both resources are incomplete.