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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Reading sound output in Java
Date: Sat, 26 Oct 2013 11:36:20 -0400
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On 10/26/2013 07:45 AM, Andreas Leitgeb wrote:
> GGolf <invalid@invalid.com> wrote:
>>> Unless you've got some very special sound hardware on the primary (VoIP
>>> running) machine, capturing both input and output (where input isn't
>>> itself mixed into the output) may just not be possible.
>> Hmm...I think you got a point here. I remember that the Stereo Mix
>> option on Windows wouldn't record the input to the microphone unless you
>> would /play it back/ to the speakers.
>
> The core of the problem appears to be that there is only one sound-device
> on a typical system, and the mixer settings are a property of that one device,
> not per-process.
>
> If the VoIP application obviously specifically requires to record only the
> microphone (in order to transmit it to the parties), then another process
> cannot have its own settings to record everything.
>
> I'm not sure if you need a recording solution for yourself, or if you
> intended to create a transcription add-on to be used by Joe "VoIP" User.
> If it was the latter, then I fear it won't be that easy.  If you create
> your own VoIP client that would be a different story, and also if there
> was an existing VoIP client with a decent API for plugging into the sound
> stream.
>
<http://licensing.ttu.edu/technologies/d-0205/vocal-recognition-with-speech-signal-processing-for-voice-over-ip-and-medical-transcription>