Re: Stuck notes in Rax and Synthtest
Re: Stuck notes in Rax and Synthtest
- Subject: Re: Stuck notes in Rax and Synthtest
- From: Philippe Wicker <email@hidden>
- Date: Thu, 8 May 2003 11:09:40 +0200
On Thursday, May 8, 2003, at 09:32 AM, Pete Yandell wrote:
I've had a bunch of user reports of stuck notes in my SimpleSynth,
which uses the DLS music device, but have never been able to reproduce
the problem on my (single processor) machine. The thought that it
could be a multiple processor issue hadn't even occurred to me until
this thread popped up.
So please keep posting with your findings for those of us that don't
have a multiple processor machine on which to test!
I own a DP867 PowerMac. I did some tests with SimpleSynth using a
modified version of PlaySequence (sample code provided with the
CoreAudio SDK). The modification of PlaySequence consists in printing
all virtual endpoints name and index, and binding "SimpleSynth virtual
endpoint" to the sequence when the option -e is added to the command
line. I also have installed Apple performances tools CHUD, which
contains an extension which allows to switch from dual to single
processor, so I could make the tests in both single and dual processor
mode.
What I could observe in **both** single and double processor mode is
that the sequence stops playing very early (almost at the beginning of
the sequence) and notes get stuck. This does not occur when letting the
MusicPlayer choosing the default MusicDevice (ie not launching
PlaySequence with the option -e).
I also have a PowerBook G4, I will made the same tests with this
machine and tell you the result.
Philippe Wicker
email@hidden
_______________________________________________
coreaudio-api mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/coreaudio-api
Do not post admin requests to the list. They will be ignored.