MTC and Time Code Types
MTC and Time Code Types
- Subject: MTC and Time Code Types
- From: "Cianflone, Chris" <email@hidden>
- Date: Wed, 26 Jan 2005 21:10:08 -0600
- Thread-topic: MTC and Time Code Types
Title: MTC and Time Code Types
Hi all,
I have read through most of the MIDI Time Code chapter from "The Complete MIDI 1.0 Detailed Specification" (and used MTC devices in the past as a user, perhaps not enough) and I thought I understood the various formats outlined there. In particular for a quarter frame message the spec refers to "Time Code Type"
0 = 24 Frames/Second
1 = 25 Frames/Second
2 = 30 Frames/Second (Drop Frame)
3 = 30 Frames/Second (Non-Drop Frame)
However, from CoreAudioTypes.h we see the following:
// constants describing SMPTE types (taken from the MTC spec)
enum
{
kSMPTETimeType24 = 0,
kSMPTETimeType25 = 1,
kSMPTETimeType30Drop = 2,
kSMPTETimeType30 = 3,
kSMPTETimeType2997 = 4,
kSMPTETimeType2997Drop = 5
};
So, what is kSMPTETimeType2997 and kSMPTETimeType2997Drop? I have been searching the web all day and not really finding a sufficient answer to this (although a few things I found made reference to these extra formats). Is there a more up-to-date MTC spec I should be reading?
Thanks,
Chris
------------------------------------
Chris Cianflone
Software Engineer
MakeMusic!
Coda Music Technologies
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