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This thread talks about switching the audio input route, but I'm wondering if it's possible to take input from two routes simultaneously. I am working on an application that will record audio using an external microphone to help deal with noise, but I would also like to record with the internal microphone too so I can compare the two.

I feel like this will take quite a bit of digging through the AVAudioSession docs to figure out, and having a quick yes or no answer before then would save me a lot of time.

Any help would be appreciated!

Community
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Shane McQuillan
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2 Answers2

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Though I haven't used it myself but.. Have you tried setting AVAudioSessionCategoryMultiRoute category in AVAudioSession.

This is what Apple docs says - For routing distinct streams of audio data to different output devices at the same time. For example, you would use this category to route audio to both a USB device and a set of headphones. Use of this category requires a more detailed knowledge of, and interaction with, the capabilities of the available audio routes. This category may be used for input, output, or both.

Usage example -

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryMultiRoute error:nil];
[[AVAudioSession sharedInstance] setActive:YES error:nil];

Please let me know/comment if it doesn't help so I delete this answer.

Ashok
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I don't think you can do it. For multiple audio devices, you are supposed to use the category AVAudioSessionCategoryMultiRoute, but the AVAudioSession.h header file has this to say on input:

 Input is limited to the last-in input port.
Rhythmic Fistman
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