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IMA4 Audio Format on MultiChannel Mixer - iPhone
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IMA4 Audio Format on MultiChannel Mixer - iPhone


  • Subject: IMA4 Audio Format on MultiChannel Mixer - iPhone
  • From: ROBB A MANIA <email@hidden>
  • Date: Mon, 31 Aug 2009 22:59:21 -0700 (PDT)

Hello all,
I am seeking some info on the playing IMA4 audio through the multichannel mixer.  I am successfully playing multiple Linear PCM .wav files through an audio graph containing two multichannel mixers and the AURIO unit.  I am now attempting to play IMA4 .caf files in this graph.  I am able to successfully set the AURIO unit input to accept IMA4.  However when I try to change the multichannel mixer unit, I receive an error.  I am not sure what I am doing wrong or if I am wrong in thinking the multichannel mixer can play IMA4 formatted audio.  Any help is appreciated.  The relevant code is below:

// Caf IMA4 Audio format

cafAudioFormat.mSampleRate = 44100.00;

cafAudioFormat.mFormatID = kAudioFormatAppleIMA4;

cafAudioFormat.mFormatFlags = 0;

cafAudioFormat.mFramesPerPacket = 64;

cafAudioFormat.mChannelsPerFrame = 2;

cafAudioFormat.mBitsPerChannel = 0;

cafAudioFormat.mBytesPerPacket = 68;

cafAudioFormat.mBytesPerFrame = 0; 

//Successfully set the AURIO input props

errorCheck = AudioUnitSetProperty(myAURIOUnit, kAudioUnitProperty_StreamFormat, 

  kAudioUnitScope_Input, 

  0, 

  &cafAudioFormat, 

  sizeof(cafAudioFormat));


//Error happens on the following call.

errorCheck = AudioUnitSetProperty(myMultiChannelMixer, kAudioUnitProperty_StreamFormat, 

  kAudioUnitScope_Input, 

  0, 

  &cafAudioFormat, 

  sizeof(cafAudioFormat));


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