[LAD] [ANN] Qtractor 0.5.3 - The Delta Whisky natural cask strength!

Albert Graef Dr.Graef at t-online.de
Mon Jan 9 20:09:54 UTC 2012

On 01/09/2012 04:00 PM, Rui Nuno Capela wrote:
> applied. qtractor svn trunk rev.2659 (v0.5.3.4)

Thanks a bunch. :) Attached is another suggested patch against the 
current trunk (r2660) to make qtractor send an MMC locate after jumping 
back to the beginning of a loop. It's not perfect, but I'm posting it 
anyway in case someone may find it useful.

As you can see I handled this in the timer callback of the main form 
which isn't 100% accurate, but I never found it to be off by more than 1 
frame, which I guess is good enough for my purposes. There are surely 
better ways to do this, but I wasn't able to figure that out without 
investing much more time reading the source code. Ideally, this should 
be handled on the spot somewhere in the MIDI engine. I tried to add it 
directly in qtractorMidiOutputThread::process(), but the read-ahead gets 
in the way there, so I couldn't find a proper way to make that work. (Is 
there a way in qtractor to schedule a callback exactly at the *real* 
time when the play head reaches a given position? Then this would be easy.)

There are a few other situations where an MMC locate is still missing, 
specifically after ending a rewind or fast-forward, but I have no idea 
how to fix this without diving into the qtractor sources much more than 
I did. :(


Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr.Graef at t-online.de, ag at muwiinfa.geschichte.uni-mainz.de
WWW:    http://www.musikinformatik.uni-mainz.de/ag
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