Re: Are Quicktime microtones supported?
Re: Are Quicktime microtones supported?
- Subject: Re: Are Quicktime microtones supported?
- From: Chris Rogers <email@hidden>
- Date: Tue, 20 Aug 2002 11:05:43 -0700
Actually you should use the QuickTime mailing list for this question,
but I can help you out here. The QT APIs are deprecated and we highly
encourage developers to move over to using AudioUnits, the DLS
synth, and the rest of our APIs in CoreMIDI, CoreAudio, and the
AudioToolbox framework. These new APIs provide more features
not accessible from QTMA, as well as being more efficient, etc....
Anyway, a bug fix for the latest release of QuickTime 6 (in Jaguar)
should support the
fractional pitches as they were originally meant to work. The scale
is logarithmic. Fractional pitches are also supported in the
DLS synth AudioUnit, although the fraction in this case is the fractional part
(from 0.0 -> 1.0) when using MusicDeviceStartNote().
Hope this helps...
Chris Rogers
Does anyone know what the story is about microtonal intonation under
QuickTime? According to the QuickTime docs, NANotePlay is supposed to accept
fractional pitches, though the meaning of the fraction is poorly documented
(logrithmic, or what?). I'm doing this with OS 10.1.5, and in any event, it
doesn't work: QT clearly understands the format, because it plays the
requested midi pitch even though it's shifted - but it ignores the
fractional part. I've tried doing this with the pitches all shifted up what
should be about a quartertone: e.g., middle C would be 0x3C7F (3C is middle
C; 7F is halfway though the unsigned fractional range of 0 - ff). What I get
is just the same pitch as if I had supplied 0x003C.
It would be a very fine thing if this were made to work. I figure I must
have the format right, given that the basic pitch is understood. Can someone
from Apple comment on any plans regarding this?
Thanks, Jeff Evans
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