I expect there will be a collective groan when posting this, but after
several hours of searching the archives and docs this is my last resort.
I'm trying to create a AU plug-in with a fixed configuration of 2x
stereo bus inputs, and 1x stereo bus output by modifying the FilterDemo
example plugin from the SDK (derived from AUEffectBase), with the
following modifications:
1. I've added creation of an additional input bus in the constructor
thus:
AUBase::CreateElements();
SetBusCount(kAudioUnitScope_Input, 2);
2. I've overridden SupportedNumChannels to return a single { 4, 2 }
pair.
3. I've overridden Initialize() so it doesn't simply try to match the
above pair to the Input(0) and Output(0) channel counts.
I'm clearly missing something fundamental though - though the buses seem
to be correctly reported with sensible audio stream formats, auval fails
with the following output:
VERIFYING DEFAULT SCOPE FORMATS:
Input Scope Bus Configuration:
Default Bus Count:2
Format Bus 0: AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm'
(0x00000029) 32-bit little-endian float, deinterleaved
Format Bus 1: AudioStreamBasicDescription: 2 ch, 44100 Hz, 'lpcm'
(0x00000029) 32-bit little-endian float, deinterleaved
Output Scope Bus Configuration:
Default Bus Count:1
Default Format: AudioStreamBasicDescription: 2 ch, 44100 Hz,
'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved
ERROR: Default Format of unit does not match reported Channel handling
capabilities
* * FAIL
Can anyone give me any pointers in the direction of my (I suspect)
obvious error?
Thanks,
Steve.