I'm using an AUGraph with a kAudioUnitSubType_VoiceProcessingIO unit with a 44.1 kHz client + hardware format. I play a 48 kHz MP4 with AVPlayer and notice that my render callbacks are modified with SRC (940/941 inNumberFrames instead of 1024). That's expected. However, when I query the audio unit it still reports a client + hardware format with 44.1 kHz. Ok.
If I swap out the IO unit with a kAudioUnitSubType_RemoteIO unit, I receive the same 941/940 inNumberFrames as before but the unit now reports a hardware format with 48 kHz (which is what I'd expect from the VoiceProcessionIO unit). Is this expected behavior? I'm looking into this issue because when this happens with my VoiceProcessingIO unit, my microphone samples get distorted. It's almost as if each sample only contains 940/941 samples instead of 1024 samples (ie. audio is 'choppy'). If I swap the unit out with RemoteIO, the mic samples are not choppy. I need to be using a client format with 44.1 kHz because I am doing a lot of video/audio mixing into my AUGraph (with AUConverter nodes converting source assets to 44.1 kHz) and sending out 44.1 kHz samples over a network stream. Any insight is helpful. Mark
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