Fwd: PulseAudio capture issue

[Andrew John Hughes]

Forwarding this to the IcedTea discussion list distro-pkg-dev; the
PulseAudio provider is (AFAIK) unique to IcedTea, so the tests with
'java-6-sun' (which I presume is the proprietary Oracle JDK) will be
using a completely different provider.

---------- Forwarded message ----------
From: August Sodora <augsod at gmail.com>
Date: 5 July 2010 21:46
Subject: PulseAudio capture issue
To: jdk6-dev at openjdk.java.net


Hello all,
I've been attempting to write a simple program to capture audio from
the microphone and found a piece of sample code that seemed to
demonstrate the basic idea but also possibly indicates a bug in the
openjdk implementation of the pulse interface. Running the example
with java-6-openjdk produces an exception when the TargetDataLine is
closed but it runs successfully with java-6-sun. The exception is
reproduced below:
java.lang.IllegalStateException: Line cant be closed if it isnt open
at org.classpath.icedtea.pulseaudio.PulseAudioTargetDataLine.close(PulseAudioTargetDataLine.java:84)
at javax.sound.sampled.AudioInputStream$TargetDataLineInputStream.close(AudioInputStream.java:484)
at javax.sound.sampled.AudioInputStream.close(AudioInputStream.java:389)
at java.io.SequenceInputStream.nextStream(SequenceInputStream.java:106)
at java.io.SequenceInputStream.read(SequenceInputStream.java:210)
at java.io.SequenceInputStream.read(SequenceInputStream.java:211)
at java.io.InputStream.read(InputStream.java:102)
at com.sun.media.sound.WaveFileWriter.writeWaveFile(WaveFileWriter.java:249)
at com.sun.media.sound.WaveFileWriter.write(WaveFileWriter.java:147)
at javax.sound.sampled.AudioSystem.write(AudioSystem.java:1354)
at AudioRecorder02$CaptureThread.run(AudioRecorder02.java:221)
And the example source can be found at
http://www.developer.com/java/other/article.php/2105421/Java-Sound-Capturing-Microphone-Data-into-an-Audio-File.htm#Complete
Program Listings
uname -a
Linux ubuntu 2.6.32-23-generic #37-Ubuntu SMP Fri Jun 11 08:03:28 UTC
2010 x86_64 GNU/Linux
Steps to reproduce:
  1. Copy the program listing into a file name AudioRecorder02.java
  2. javac AudioRecorder02.java
  3. sudo update-java-alternatives -s java-6-openjdk
  4. java AudioRecorder02
  5. Select "Capture" followed by "Stop"
  6. The above exception will be produced
If in step 3, one replaces java-6-openjdk with java-6-sun, the program
runs successfully.
I'd be interested in investigating this further if that would be useful.
Augie


-- 
Andrew :-)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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