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Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1439763-audiooutputunitstart
func AudioOutputUnitStart (_ ci: Audio Unit) -> OSStatus. Parameters ci. The I/O audio unit to start. Return Value. A result code. See Also. Starting and Stopping Output. func Audio Output Unit Stop (Audio Unit) -> OSStatus. Stops an I/O audio unit, which in turn stops the audio unit processing graph that it is connected to.
ios - Why does AudioOutputUnitStart() fail with return ...
https://stackoverflow.com/questions/27892712/why-does-audiooutputunitstart-fail-with-return-code-500
Activates the AVAudioSession. Instantiates an audio component instance. Sets properties of the audio unit, eg. a callback function and an AudioStreamDescription. Initializes the audio unit. But the program failes to start the recording - the AudioOutputUnitStart function failes with return code -500.
ios - AudioOutputUnitStart failed with OSStatus = -66637 ...
https://stackoverflow.com/questions/35936989/audiooutputunitstart-failed-with-osstatus-66637-how-to-print-osstatus-from-c
AudioOutputUnitStart failed with OSStatus = -66637 (How to print OSStatus from c++) Ask Question Asked 5 years, 10 months ago. Active 2 years, 4 months ago. Viewed 1k times 4 I faced with issue when the AudioOutputUnitStart failed on start recording. !!! I have already found the root cause without this returned code: it happens because of ...
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1439763-audiooutputunitstart?preferredLanguage=occ
OSStatus AudioOutputUnitStart (Audio Unit ci); Parameters ci. The I/O audio unit to start. Return Value. A result code. See Also. Starting and Stopping Output. Audio Output Unit Stop. Stops an I/O audio unit, which in turn stops the audio unit processing graph that it is connected to.
AudioOutputUnitStart producing error on d… - Apple Community
https://discussions.apple.com/thread/2251087
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