Date: Wed, 13 Jan 1999 14:19:14 +0000
From: Jean-Michel Trivi <###@###.###>
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To: Kara Kytle <Kara.Kytle@Eng>
Subject: js0.8 : small error + question
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First of all, I would like to thank you for your support in the
javasound mailing list. It is really great to have messages from the
people who work on this API.

...

I am trying to implement an "audio loop" with JavaSound to get familiar
with the API, test latency and full duplex : to output on the speakers
the sound recorded by the microphone. I thought it would work by
creating a PushAudioInput (captureChannel) and connecting it to a
PushAudioOutput (playbackChannel) with the "setSink()" method.

There is no problem when creating both channels.
Then I set the format of the playbackChannel as the one from the
captureChannel.
Acquiring and starting the captureChannel runs fine but the "acquire()"
method called by the playbackChannel throws this exception :

Failed to start audio capture: javax.media.ResourceUnavailableException:
Audio Device Unavailable

Yet the system I am working on is full duplex (Ultra60) and a similar
application runs in C. Indeed on Solaris, you can always open the audio
device as read only and then, in the same program or in another, you can
open it as write only. Could it be an error in JavaSound for Solaris as
the audio device would be declared as "busy" if the "acquire()" method
of a "AudioInControlDevice" or "AudioOutControlDevice" opens the audio
device with both read & write rights ?

To know more about my planned use of JavaSound, Warren Dale from the
Java3D team wrote a paper about his 3D sound architecture and speaks
about my work in paragraph 4.2.2 (sorry I dont't have the file that
describes the project of my team with me today !)

Best regards.
--
 _____________________________________________________________
  Trivi Jean-Michel http://www-vis.imag.fr/
               GRAVIR Lab - CLAVIS project - Grenoble (France)
  mailto:###@###.### http://www-vis.imag.fr/trivi
 _____________________________________________________________