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I've been able to connect AVAudioInputNode (which takes microphone input data) and connect it to the AVAudioEngine. I can hear the output from the (upper) speaker if I put my phone close enough to my ear. How can I route the audio output to the (bottom) speaker instead ? (Think of it as a loudspeaker..)

Jacky Coolheart
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2 Answers2

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Get the sharedInstance of your AVAudioSession. Then call setCategory:withOptions:error passing in the parameters below:

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker error:Nil];

Nick
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  • Hi Nick, thx for the reply. I've tried to setup the AudioSession, but I get gibberish environment noise from the (bottom) speaker and if I said something, there's no voice coming out from the speaker... – Jacky Coolheart Oct 14 '14 at 16:40
  • Then there's a problem elsewhere in your code. Post a new question specific to the 'gibberish' noise coming out of the lower speaker, post the relevant code and we can go from there. – Nick Oct 14 '14 at 21:10
  • Hi Nick, seems like you have had experience in audio related stuff. Can you take a look at my other related question ? Thx. http://stackoverflow.com/questions/26270127/ios8-avaudioengine-how-to-send-microphone-data-over-multipeer-connectivity – Jacky Coolheart Oct 17 '14 at 02:08
  • How do I send PCMBuffer over network ? I use MultiPeer to send, but I have no idea how to convert it back to AVAudioPCMBuffer in didReceiveData. Here's my sending code: `MCPeerID *remotePeerID = [self.sessionMC.connectedPeers objectAtIndex:0]; NSArray *peersArray = @[remotePeerID]; NSError *error = nil; NSData *data = [NSData dataWithBytes:buffer.floatChannelData length:buffer.frameLength]; [self.sessionMC sendData:data toPeers:peersArray withMode:MCSessionSendDataReliable error:&error]; if(error) {NSLog(@"error: %@", [error localizedDescription]);}` – Jacky Coolheart Oct 19 '14 at 16:07
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Here is how I did it in swift 

//In declarations
var audioSession:AVAudioSession = AVAudioSession.sharedInstance()
//In viewDidLoad 
audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, withOptions: AVAudioSessionCategoryOptions.DefaultToSpeaker, error: nil)
Horatio
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  • Thank you! :) But I got `Ambiguous reference to member 'setCategory'`Error. For me it worked (Swift 2.2) by removing the error part: `try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, withOptions: AVAudioSessionCategoryOptions.DefaultToSpeaker)` – Joey Sep 05 '16 at 21:59