Using AudioPlayer node changes sampling frequency to 44,100

Question

I have the following audio engine chain in Audiokit :

48kHz audio file -> AudioPlayer -> some node -> NodeRecorder -> audio file

Even though the input file is 48kHz , the recorded file comes out at 44,100 Hz.

How to force AudioKit to stay at 48KHz throughout ?

I'm using Audiokit 5.3

Btw, If I use microphone as input instead of file, then all is well, the recorded file comes out at 48kHz. Mic input -> some node -> NodeRecorder -> audio file

So I suspect the AudioPlayer node is doing some unrequested resampling, how to turn that off?

user_1152548 · Answer

It is possible you can change the value of defaultAudioFormat in the Settings.swift in the AudioKit package. That looks like the only place the sample rate is being set explicitly: https://github.com/AudioKit/AudioKit/search?q=44

user_2079555 · Answer

Thank you @Nick , this put me in the right direction. Actually all that was needed to run the engine at 48kHz was to add this line at init():

Settings.audioFormat = AVAudioFormat(standardFormatWithSampleRate: 48000, channels: 2) ?? AVAudioFormat()

Using AudioPlayer node changes sampling frequency to 44,100

2 Answers