Re: CAClock and kCAClockProperty_InternalTimebase
Re: CAClock and kCAClockProperty_InternalTimebase
- Subject: Re: CAClock and kCAClockProperty_InternalTimebase
- From: Doug Wyatt <email@hidden>
- Date: Tue, 3 Mar 2009 08:37:32 -0800
On Mar 2, 2009, at 19:55 , I. K. wrote:
Hello,
I want to create an instance of CAClock wich derives its timing source
from an AudioDevice.
I get kCAClock_InvalidTimebaseSourceError
that means that you have selected a timebase source when the timebase
is host time
and
kCAClock_InvalidTimebaseError in the code bellow.
that looks like a long-standing bug where using an audio device as the
timebase source won't work. I've written a bug.
it looks like using an audio output unit will work however.
// CAClockTimebase time_base = kCAClockTimebase_HostTime;
CAClockTimebase time_base = kCAClockTimebase_AudioDevice;
// CAClockTimebase time_base = kCAClockTimebase_AudioOutputUnit;
err = CAClockSetProperty(
clk,
kCAClockProperty_InternalTimebase,
sizeof(CAClockTimebase),
&time_base);
checkErr(err);
err = CAClockSetProperty(
clk,
kCAClockProperty_TimebaseSource,
// sizeof(HALUnit),
// &HALUnit);
sizeof(AudioDeviceID),
&mOutputDevice);
checkErr(err);
the calls work fine if I set it to kCAClockTimebase_HostTime.
Actually, it is just the first one (to set
kCAClockProperty_InternalTimebase which is the default and doesnt need
a source).
mOutputDevice and HALUnit are fine. The code was inserted for testing
purposes in the sdk's SimplePlayThru example.
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