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]> 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
>
>
>
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