<Sound Dev> DirectSound multi-channel recording

[Klaus Jaensch]

Hi Alex,

On Mon, 24 Sep 2007, Alex Menkov wrote:

> 
> Klaus Jaensch wrote:
> > > It's CR 6477263: JavaSound doesn't support multi-channels on Windows
> > > (http://bugs.sun.com/view_bug.do?bug_id=6477263)
> > > Feel free to develop a fix for the CR :)
> > >
> > 
> > Yes good idea, but I fear building the JDK under Windows, because Sun uses
> > old versions of SDK's and Compiler (I do not have VS.NET 2003 and I don't
> > want to buy it at eBay). I have already build an older JDK version and it
> > was horrible. (Tweaking make files and so on ...)
> > Is it possible to compile dsound.dll seperatly with VS 2005 Express ?
> 
> Due the build doc (make/README-builds.html) "VS2005 compiler will not work at
> this time due to the new runtime dll and the manifest requirements". :(
> I never used VS2005 so I don't know what it requires.
> AFAIR there was some free toolkit with VS2003 c++ compiler. Most likely it
> should work.
> (BTW you need to build jsoundds.dll - see make/javax/sound/jsoundds)
>

thanks for the hint, but I'm too late for download:
"The Visual C++ Toolkit 2003 has been replaced by Visual C++ 2005 Express Edition." 

Regards,

Klaus

> 
> > > Why do you want to keep supported format unchanged?
> > > Right way is to change the supported formats (line/mixer should report
> > > formats
> > > it really supports).
> > >
> > 
> > Yes, you are right. But I do not know if it is possible to get the supported
> > formats from DirectSound.
> > I think the number of capture channels is available, but only when the line
> > is open.   
> 
> Yes, DirectSound does not provide information about HW capabilities (the
> detection was possible in WinMM, but I don't remember is it possible to
> determine relations between WinMM & DS devices and I'm not sure WinMM
> functions 
> supports >2 channels).
> Anyway I think due DirectSound can handle multi-channel audio, 
JavaSound
> should report it as supported formats (at least for playback, capturing
> requires additional research).
> 
> > 
> > Regards,
> > Klaus
> > 
> > > Regards
> > > Alex
> > >
> > > Klaus Jaensch wrote:
> > > > Hello,
> > > >
> > > > I would like to record multi-channel 24-bit audio with the DirectSound
> > > > JavaSound implementation under Windows. But the audio formats defined in
> > > >
> > > > j2se/src/windows/native/com/sun/media/sound/PLATFORM_API_WinOS_DirectSound.cpp
> > > >
> > > > are limited to 8/16bit and 1 or 2 channels. I would like to discuss how
> > > > this limitation could be removed.
> > > >
> > > > For testing multichannel capabilities of JavaSound I extended
> > > > channelsArray
> > > > up to 8 channels and bitsArray for 24/32 bit recordings, then compiled
> > > > dsound.dll and tested recording.
> > > > It worked fine, so it's a pity that the recording formats are restricted
> > > > to
> > > > basic formats.
> > > >
> > > > The question is how to make multi-channel possible without changing the
> > > > supported defaults formats, which can be queried by
> > > > isFormatSupported(AudioFormat).
> > > >
> > > > Regards,
> > > >
> > > > Klaus
> > > >
> > > > ------------------------------------------
> > > > Klaus Jaensch
> > > > Muenchen
> > > > Germany
> > > >
> > > > Institut fuer Phonetik und Sprachverarbeitung
> > > > Schellingstr.3/II
> > > > 80799 München
> > > >
> > > > EMail: klausj at phonetik.uni-muenchen.de
> > 
> > ------------------------------------------
> > Klaus Jaensch
> > Muenchen
> > Germany
> > 
> > Institut fuer Phonetik und Sprachverarbeitung
> > Schellingstr.3/II
> > 80799 München
> > 
> > Phone (Work): +49-(0)89-2180-2806
> > Fax:          +49-(0)89-2180-5790
> > EMail: klausj at phonetik.uni-muenchen.de
> 

------------------------------------------
Klaus Jaensch
Muenchen
Germany

Institut fuer Phonetik und Sprachverarbeitung
Schellingstr.3/II
80799 München

Phone (Work): +49-(0)89-2180-2806
Fax:          +49-(0)89-2180-5790
EMail: klausj at phonetik.uni-muenchen.de