Re: A number of simple questions (still a few unanswered)
Re: A number of simple questions (still a few unanswered)
- Subject: Re: A number of simple questions (still a few unanswered)
- From: James McCartney <email@hidden>
- Date: Wed, 06 Feb 2013 13:45:11 -0800
On Dec 5, 2012, at 12:11 PM, Paul Davis < email@hidden> wrote:
On Wed, Dec 5, 2012 at 2:14 PM, Seth Willits <email@hidden> wrote:
Still a few I'm unsure about. :)
- Why is AudioTimeStamp.mSampleTime a float if it's an integer number of samples?
because apple don't want accurate timestamps beyond 12 (or even 6 hours).</sarcasm>
Answering an old question, but this is wrong.
mSampleTime is a Float64.
Float64s have 52 bits of mantissa. With the implicit one bit, that gives 2^53 representable nonnegative integers.
Let's say you are running at 192000 samples per second. 3600 seconds per hour 24 hours per day 365.25 days per year
pow(2,53) / 192000 / 3600 / 24 / 365.25 = 1486.57 years before loss of sample accuracy.
James McCartney Apple CoreAudio
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