[gmpi] Re: New Reqs 3.8 - Events
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Thu, 18 Dec 2003 18:46:34 -0800
On Thu, Dec 18, 2003 at 11:55:11PM -0500, Michael Gogins wrote:
> Then I don't understand the distinction between absolute and relative
> timestamps. It seems to me that what I have described is absolute
> timestamps.
OK, let me explain it as I understand it:
No matter what, you always send the absolute timestamp at the start of the
process routine; call that the 'now' value.
Absolute timestamps put a 64-bit value on each event which represents the
absolute time of the event on the same timeline as 'now'. An event which is
due 5 samples into the buffer has a timestamp of (now + 5).
Relative timestamps put a 32-bit value on each event which represents the
offset of the event relative to 'now'. An event which is due 5 sampled into
the buffer has a timestamp of 5.
The difference is mostly a usage pattern.
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