Re: AU MIDI events scheduled beyond next rendering slice
Re: AU MIDI events scheduled beyond next rendering slice
- Subject: Re: AU MIDI events scheduled beyond next rendering slice
- From: Bill Stewart <email@hidden>
- Date: Wed, 6 Aug 2003 12:54:51 -0700
On Wednesday, August 6, 2003, at 09:04 AM, Marc Poirier wrote:
Urs' question about AU MIDI event scheduling reminded me of another
question that I've been meaning to ask:
A few weeks ago, I read a message from Urs on the osxaudio.com forums
saying that AU hosts could send MIDI events to AUs with frame offset
positions that are greater than the size of the next rendering slice.
That was certainly not our intention with these offsets.
But (and the documentation is I think clear on this), the frame offsets
are always described as being offsets into the NEXT slice of audio that
is to be rendered (and for ramped parameters, they are rescheduled for
each slice), so I'd have to Urs was incorrect in his assertion.
So
in other words, some MIDI events might not actually be for the next
rendering slice but for some rendering slice beyond that one, and so
AUs
need to keep a "future events" queue for those. Urs said that Logic
does
this sometimes, for example.
Is this true? And is it considered acceptable for an AU host to do
this?
I'd suggest that Logic might want to fix this, as we don't expect this,
and these parameters are then probably not being scheduled correctly.
It is always intended that the buffer offset is only to the next buffer
- the AU isn't expected to "sequence" :) events beyond that.
Bill
Thanks,
Marc
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