Long delay in AUGraphStart
Long delay in AUGraphStart
- Subject: Long delay in AUGraphStart
- From: Guy Shaviv <email@hidden>
- Date: Sat, 10 Jul 2010 14:44:58 +0300
Hi,
I'm experiencing a 1.875 second delay between calling AUGraphStart and starting to hear music. I'm wondering if this is normal to have such a long delay (a bug/feature) or if there is anything to be done about it? I'm seeing this both on the ipad and the simulator.
My AUGraph consists of a remoteIO unit and an equalizer unit. The equalizer is set a render input callback to feed it data. Everything is using the canonical AU stream format (the 8.24 one, non interleaved).
To measure the delay, I created a dummy function called marker that does nothing. I call marker() the line before calling AUGraphStart and I call it again first line in my render input callback. In instruments I used dtrace to see the time between the two calls which shows the time as 1.875 sec. During this time the processor is mostly idle, 75% of the time in mach_msg_trap being called from AURemoteIO::IOThread::Entry().
Any ideas why this is happening or how to get rid of this very long delay are appreciated. _______________________________________________
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