Re: Multimedia timing on OS X
Re: Multimedia timing on OS X
- Subject: Re: Multimedia timing on OS X
- From: Garett Shulman <email@hidden>
- Date: Tue, 03 May 2011 14:53:19 -0600
This is an interesting topic. Based on my own googling, I haven't noticed a general technique for doing high resolution multimedia timing on OS X. I would like this for scheduling midi events also. It seems like there ought to be an abstraction for high resolution multimedia timing in the cocoa platform. I'm curious about the intention of the CoreAudio clock. Additional techniques may involve mach absolute time, NSTimer with a high priority, and CAMediaTiming. Do folks on this list have any insight or wisdom about techniques for high resolution multimedia timing on cocoa? Thanks! -Garett
On May 3, 2011, at 2:41 PM, Paul Davis wrote:
> On Tue, May 3, 2011 at 4:38 PM, Tom Jeffries <email@hidden> wrote:
>> It's very simple- I have a MIDI sequencer that is playing data that is
>> updated in real time. I want to use a clock to check to see what has been
>> added, and then send the MIDI data out. I can probably get reasonable
>> accuracy using MIDIPackets, but it seems more direct to take control of the
>> playback by use of an accurate clock.
>
> Most of the people on this list tend to work on audio (i.e. not pure
> MIDI) software where the sample clock of the audio interface is easily
> and trivially available for timing purposes.
>
> I'm sure there are some people who have done some MIDI-only work, but
> probably not that many.
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