Stop audio recording and continue audio playback

Question

My application plays music and records from mic at the same time. Recording can be started after playback is started or before playback is started

And now I want to stop recording but keep playback running at the same time.

How can I do this?

I can stop recording and playback by using

[[AVAudioSession sharedInstance] setActive:NO error:nil];

But the issue is: I want to stop recording only.

I tried to change category to AVAudioSessionCategoryPlayback using the following code

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&error]

but that doesn't stop recording.

Answer 1

I solved the issue by explicitly stopping all recording activity without touching AVAudioSession at all.

The following warning

AVAudioSession.mm:623: -[AVAudioSession setActive:withOptions:error:]: Deactivating an audio session that has running I/O. All I/O should be stopped or paused prior to deactivating the audio session.

helped me to identify the issue.

Initially I forgot to call the AudioOutputUnitStop method of AudioUnit framework. Because of this recording process was still running and audio session were indicating that.