Re: synchronization issue with Logic 7.1- help please
Re: synchronization issue with Logic 7.1- help please
- Subject: Re: synchronization issue with Logic 7.1- help please
- From: William Stewart <email@hidden>
- Date: Fri, 5 Aug 2005 10:53:44 -0700
All devices drift from their "nominal" sample rate. The main and
crucial thing for a device is to provide, through its time stamps, as
accurate a picture as possible concerning the progression of time;
from that the HAL can discern the device's actual sample rate. Its
really then a "simple" matter for the driver - it reports the
progression of time according to its crystal, translating that to the
CPU clock times required by the HAL.
Bill
On 05/08/2005, at 5:46 AM, Philip Lukidis wrote:
I was wondering, does anyone on the list think that a small drift
in device
sample rate could cause this? Just how precise does the reported
sample
rate to the HAL have to be?
thanks,
Philip Lukidis
-----Original Message-----
From: Philip Lukidis
Sent: Thursday, August 04, 2005 2:04 PM
To: email@hidden
Subject: RE: synchronization issue with Logic 7.1- help please
Several days ago when I sent this we had massive internal server
issues, so
I have opted to send this again, sorry if this turns our to be a
double
send.
I will also ask an additional question: could skewed timestamps
account for
this? Let me say that when Logic reports bad audio/MIDI
synchronization,
audio still continues to play.
If skewed timestamps could not be responsible, does anyone else
know what
could be?
thanks,
Philip Lukidis
-----Original Message-----
From: Philip Lukidis
Sent: Friday, July 29, 2005 3:43 PM
To: email@hidden
Subject: synchronization issue with Logic 7.1- help please
Hello. I'm responsible for the maintenance of a 1394 kext (top
edge is
coreaudio) which I did not write. MacOSX is not my primary
environment, so
forgive me if I am asking a naive questions.
I have a problem when looping a simple project (one of the demos)
in Logic
7.1. After perhaps 45-60 min, I get a popup saying that
synchronization
between MIDI and audio was lost. Meanwhile, audio is still going
on in the
background, so it would appear that my timestamps are OK (otherwise, I
thought this might be pertinent
http://lists.apple.com/archives/coreaudio-api/2002/Sep/msg00308.html).
There is nothing being sent over the MIDI at all, nor am I
synchronizing off
a remote source/clock, nor is there any MIDI input. It even occurs
when I
have uninstalled my MIDI plugin, though my kext has changed
considerably
since then (I will redo this test and post the results).
If anyone has a clue why this could be occurring, I'd appreciate a
reply.
thanks,
Philip Lukidis
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