[vlc-devel] [PATCH 1/2] audio_filter: SOFAlizer new module

Piotr Majdak piotr at majdak.com
Fri Apr 17 21:18:05 CEST 2015

David Fuhrmann wrote:
>> Keeping in mind what I wrote above (our goal is seamless switching between files during playback), do you think the variable callback approach would work?
> I understand your need here. Question is: How long does it take to load and parse such an HRTF file? Its probably quite fast, and then it should be fine to use a callback. I mean who cares if the switch to the new HRTF file happens only 20 ms after you clicked something in the GUI.

Not sure if you really want to do so. The parsing will depend on the 
size of the file. The free-field HRTFs are usually about 3 MB (zipped, 
they will be decompressed on load), see the files from 
<http://www.sofaconventions.org/mediawiki/index.php/Files> The 
reverberant files can be in the range of GBs, see 
That's why we currently pre-load three HRTF files, giving the user the 
possibility to switch between them on-the-fly.

BTW, this is a student project and it will end in June. In the future, 
having the basic functionality of SOFAlizer available for everybody, I 
hope to motivate my future students to further improve this plug-in, 
according to your suggestions, of course. That's why it is important to 
have a basic functionality included in the sources. Do you think we can 
make it?

BTW 2, SOFA is a new standard for spatially oriented data, see 
I am the main developer of SOFA. If you have any question about SOFA and 
its use in binaural acoustics, do not hesitate to ask.


Piotr Majdak
Psychoakustik und Experimentelle Audiologie
Institut für Schallforschung <http://www.kfs.oeaw.ac.at>
Österreichische Akademie der Wissenschaften <http://www.oeaw.ac.at/>
Wohllebengasse 12-14, 1040 Wien
Tel.: +43 1 51581-2511
Fax: +43 1 51581-2530
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