AVAudioEngine debugDescription for no audio output problem

Question

Created Dec ’21

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I have a simple audio graph, input, effect audioUnit, mixer and out. When I include my effect audioUnit, I lose my audio output. I believe the graph shows the problem, I just don't know how to interpret it.

________ GraphDescription ________ AVAudioEngineGraph 0x7fd2b7c08c90: initialized = 1, running = 1, number of nodes = 6

 ******** output chain ********

 node 0x6000016b3f00 {'auou' 'rioc' 'appl'}, 'I'
	 inputs = 1
		 (bus0, en1) <- (bus0) 0x6000016b7580, {'aumx' 'mcmx' 'appl'}, [ 2 ch,  44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]

 node 0x6000016b7580 {'aumx' 'mcmx' 'appl'}, 'I'
	 inputs = 1
		 (bus0, en1) <- (bus0) 0x600001680d80, {'aufx' 'vpio' 0x00000000}, [ 2 ch,  44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]
	 outputs = 1
		 (bus0, en1) -> (bus0) 0x6000016b3f00, {'auou' 'rioc' 'appl'}, [ 2 ch,  44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]

 node 0x600001680d80 {'aufx' 'vpio' 0x00000000}, 'I'
	 inputs = 1
		 (bus0, en1) <- (bus0) 0x600000abb330, {'aufc' 'conv' 'appl'}, [ 2 ch,  44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]
	 outputs = 1
		 (bus0, en1) -> (bus0) 0x6000016b7580, {'aumx' 'mcmx' 'appl'}, [ 2 ch,  44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]

 node 0x600000abb330 {'aufc' 'conv' 'appl'}, 'I'
	 outputs = 1
		 (bus0, en1) -> (bus0) 0x600001680d80, {'aufx' 'vpio' 0x00000000}, [ 2 ch,  44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]

 ******** input chain ********

 node 0x600001681100 {'auou' 'rioc' 'appl'}, 'I'

 ******** other nodes ********

 node 0x600001685080 {'aumx' 'mcmx' 'appl'}, 'U'

I'm guessing these 0's are telling me something:

node 0x600001680d80 {'aufx' 'vpio' 0x00000000}, 'I' inputs = 1

Any assistance is really appreciated. I encountered this, thought it would be simple to diagnose and fix, but I find myself spinning my wheels.

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Answer 1

FredTr OP

Dec ’21

Effects AudioUnit properties look ok, except the output enable properties crash, selector not found.

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Answer 2

FredTr OP

Dec ’21

Added a tap to the effects AudioUnit. It is outputting audio waveform, but only snippets of it, surrounded by lots of 0's. I removed memory allocation from the realtime code in the effects AudioUnit, it made no difference. I am testing this with simulator with performance issues. I wonder if the realtime code can't keep up?

0