Apple

Hi Espen,

These lines seem odd together:

MixerHostAudio* THIS = (MixerHostAudio *)inRefCon;
soundStructPtr soundStructPointerArray = (soundStructPtr) inRefCon;

inRefCon is what you pass to the callback, designated when you define the AURenderCallbackStruct (it’s inputProcRefCon member). THIS is not some fancy keyword, just a convention that somebody used and which stuck. I think it’s unlikely to be a MixerHostAudio anyway…

THIS.timeIntoBeat = sampleNumber; //this is where i get the bad access

Is timeIntoBeat a property you created on a class? It’s not a member of MixerHostAudio (https://developer.apple.com/library/ios/#samplecode/MixerHost/Listings/Classes_MixerHostAudio_h.html). Perhaps it’s a member of your soundStructPtr?

Gratefully,

Hari Karam Singh

References:
	>Bad access with reference within mixer callback (From: Espen Kluge <email@hidden>)