Hi guys,

Just talked to Chris Cannam regarding some questions I had about his
library, for those interested:

--- Begin Message ---
2008/4/23 Albert Santoni <[EMAIL PROTECTED]>:
>  I'm a developer from Mixxx (http://www.mixxx.org), and I was wondering
>  if Rubberband is thread-safe/re-entrant. I'm thinking about
>  experimenting with using your library to do some realtime stretching on
>  our tracks inside Mixxx, and I couldn't find information on your website
>  about this. (SoundTouch isn't thread-safe, as we learnt the hard way...)
>
>  Any insight or advice is much appreciated!

Albert,

Rubber Band is thread-safe, in the sense that multiple instances of
RubberBandStretcher may be created and used in separate threads
concurrently without any further locking and without affecting each
others' behaviour.  The code is completely intended to support this
and if you experience any problems with it I would like to know so I
can fix them.

For any single instance of RubberBandStretcher, you may not call
process() more than once concurrently, and you may not change the time
or pitch ratio while a process() call is being executed (this assumes
a stretcher created in "real-time mode"; in "offline mode" you can't
change the ratios during use anyway).  So you can run process() in its
own thread if you like, but if you want to change ratios dynamically
from a different thread, you will need some form of mutex in your
code.  Changing the time or pitch ratio is real-time safe, so for most
applications that may change these dynamically it probably makes most
sense to do so from the same thread as calls process() even if that is
a real-time thread.

>  P.S. Do you mind if I forward your reply to our developers' mailing
>  list?

Not at all, go ahead.  If you can send me a link to an archive of the
thread, that would be good (so I can read the context).

Thanks,


Chris

--- End Message ---
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