Thanks. That’s an interesting suggestion. I’m just setting up to branch my existing code to set different stereoStreamFormats for pre-ios 8 & iOS 8. My earlier email was incorrect about the iOS 7 sample storage. I am using Uint 32, not SInt 32.
The approach you suggest should avoid having to make that branch. I’ll have to look into it. regards, rob > On Jan 9, 2015, at 10:43 AM, Matt Hart <[email protected]> wrote: > > I know this doesn't really answer your question, but I avoid creating > AudioStreamFormatDescription structures. Instead, I grab the Info structure > from the destination and set that to source. > > e.g. get a matrix mixer unit input description: > AudioStreamBasicDescription mxmx_Input_asbd = {0}; > size = sizeof(mxmx_Input_asbd); > result = AudioUnitGetProperty(mxmx_unit[controllerIndex], > kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &mxmx_Input_asbd, > &size); > > set that to the source conv unit output description: > result = AudioUnitSetProperty(conv_unit, > kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &mxmx_Input_asbd, > sizeof(mxmx_Input_asbd)); > > > On Jan 9, 2015, at 10:38 AM, Robert Carroll <[email protected] > <mailto:[email protected]>> wrote: > >> Hi, >> >> At the tail end of WWDC 2014 session 501, Doug Wyatt mentions in passing >> that these new classes can be integrated into existing core audio code. Has >> anyone found any examples/ documentation on how to accomplish this? >> >> iOS 8 has broken the audio output of my audiograph code. I assume its has >> something to do with the deprecated audiosampletype and audiounitsampletype. >> On Mac OS I’ve changed these references to Float 32 and everything works as >> expected. For iOS 7 and earlier float 32 resulted in dangerous full volume >> white noise output. I found that Sint 32 worked, but apparently not for iOS8. >> >> The developer session states that there is now a common audio format between >> OS X and iOS, so hopefully Float 32 with the same flags I’m using for Mac >> will solve the iOS 8 problem, but will require more branching code to >> continue to support iOS 6 - 7. >> >> thanks, >> >> rob >> >> >> Robert Carroll >> RSM Records >> Toronto >> http://www.rsmrecords.com <http://www.rsmrecords.com/> >> >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Coreaudio-api mailing list ([email protected] >> <mailto:[email protected]>) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/coreaudio-api/matt%40matthart.com >> <https://lists.apple.com/mailman/options/coreaudio-api/matt%40matthart.com> >> >> This email sent to [email protected] >
_______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com This email sent to [email protected]
