Using AVAudioRecorder to record the output of the mainMixerNode of an AVAudioEngine instance

Question

Created Mar ’20

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I am trying to use the

AVAudioRecorder

method to record the output of the

mainMixerNode

of an

AVAudioEngine

instance and save it to an MPEG4ACC file. From what I have been reading the default input to

AVAudioRecorder

is the microphone. I have everything setup so I can record to a file but how can I change the

AVAudioRecorder

input to be the

mainMixerNode

output?

Boost

Answer 1

Mar ’20

Accepted Answer

It seems like

AVAudioRecorder

only records from the microphone. The solution is to install a tap on the

mainMixerNode

. This tap provides an

AVAudioPCMBuffer

which can be written into an

AvAudioFile

which can be an MPEG4AAC file.

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