Reading and recording at the same time with AudioUnit

Hi,
I am trying to read and record at the same time on the iPhone with AudioUnit. For the reading part I made an AUGraph which works fine, constructed like that:
NewAUGraph(&_graph);
_outputUnitComponentDescription.componentType = kAudioUnitType_Output;
_outputUnitComponentDescription.componentSubType = kAudioUnitSubType_RemoteIO;
_outputUnitComponentDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
_outputUnitComponentDescription.componentFlags = 0;
_outputUnitComponentDescription.componentFlagsMask = 0;
AUGraphAddNode(_graph, &_outputUnitComponentDescription, &_outputNode);
_mixerUnitComponentDescription.componentType = kAudioUnitType_Mixer;
_mixerUnitComponentDescription.componentSubType = kAudioUnitSubType_MultiChannelMixer;
_mixerUnitComponentDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
_mixerUnitComponentDescription.componentFlags = 0;
_mixerUnitComponentDescription.componentFlagsMask = 0;
AUGraphAddNode(_graph, &_mixerUnitComponentDescription, &_mixerNode);
AUGraphConnectNodeInput(_graph, _mixerNode, 0, _outputNode, 0);
AUGraphOpen(_graph);
AUGraphNodeInfo(_graph, _outputNode, NULL, &_outputUnit);
AUGraphNodeInfo(_graph, _mixerNode, NULL, &_mixerUnit);
_generatorUnitComponentDescription.componentType = kAudioUnitType_MusicDevice;
_generatorUnitComponentDescription.componentSubType = kAudioUnitSubType_RemoteIO;
_generatorUnitComponentDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
_generatorUnitComponentDescription.componentFlags = 0;
_generatorUnitComponentDescription.componentFlagsMask = 0;
for(int i=0; i< [_urlList count]; i++)
SoundBuffer* soundBufferTemp = [_bufferSoundList objectAtIndex:i];
AURenderCallbackStruct renderCallbackStruct;
renderCallbackStruct.inputProc = MyFileRenderCallback;
renderCallbackStruct.inputProcRefCon = soundBufferTemp;
AudioStreamBasicDescription* inputAsbd = [soundBufferTemp getASBD];
err = AudioUnitSetProperty(_mixerUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
i,
inputAsbd,
sizeof(AudioStreamBasicDescription));
UInt32 zero = 0;
err = AudioUnitSetProperty(_mixerUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
kInputBus,
&zero,
sizeof(zero));
err = AUGraphSetNodeInputCallback(_graph,
_mixerNode,
i,
&renderCallbackStruct);
This works well, for the recording AudioUnit I did the following:
OSStatus err;
AudioComponentDescription audioComponentDescription;
AudioComponent audioComponent;
audioComponentDescription.componentType = kAudioUnitType_Output;
audioComponentDescription.componentSubType = kAudioUnitSubType_RemoteIO;
audioComponentDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
audioComponentDescription.componentFlags = 0;
audioComponentDescription.componentFlagsMask = 0;
audioComponent = AudioComponentFindNext(NULL, &audioComponentDescription);
err = AudioComponentInstanceNew(audioComponent, &_audioUnit);
UInt32 size;
size = sizeof(AudioStreamBasicDescription);
err = AudioUnitGetProperty(_audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
1,
&_soundFileDataFormat,
&size);
_soundFileDataFormat.mSampleRate = 44100.00;
AudioUnitSetProperty(_audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
kInputBus,
&_soundFileDataFormat,
size);
AudioUnitSetProperty(_audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
kOutputBus,
&_soundFileDataFormat,
size);
AURenderCallbackStruct renderCallbackStruct;
renderCallbackStruct.inputProc = MyRecorderCallback;
renderCallbackStruct.inputProcRefCon = self;
UInt32 one = 1;
UInt32 zero = 0;
err = AudioUnitSetProperty(_audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
kInputBus,
&one,
sizeof(one));
err = AudioUnitSetProperty(_audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output,
kOutputBus,
&zero,
sizeof(zero));
err = AudioUnitSetProperty (_audioUnit,
kAudioOutputUnitProperty_SetInputCallback,
kAudioUnitScope_Global,
0,
&renderCallbackStruct,
sizeof(AURenderCallbackStruct));
err = AudioUnitInitialize(_audioUnit);
Then in I setup a file to write in:
- (void) openFile
OSStatus err;
err = ExtAudioFileCreateWithURL((CFURLRef) _soundFileUrl,
kAudioFileCAFType,
&_soundFileDataFormat,
NULL,
kAudioFileFlags_EraseFile,
&_extAudioFileRef);
err = ExtAudioFileSetProperty(_extAudioFileRef,
kExtAudioFileProperty_ClientDataFormat,
sizeof(AudioStreamBasicDescription),
&_soundFileDataFormat);
err = ExtAudioFileWriteAsync(_extAudioFileRef,
0,
NULL);
All this things works well (I check by printing err in the log which I removed here for clarity).
And then in the callback for recording I do the following:
static OSStatus MyRecorderCallback(void *inRefCon,
AudioUnitRenderActionFlags* inActionFlags,
const AudioTimeStamp* inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumFrames,
AudioBufferList* ioData)
OSStatus err= noErr;
AudioUnitRecorder* auRec = (AudioUnitRecorder*) inRefCon;
[auRec allocateAudioBufferList:1 size:inNumFrames*4];
err = AudioUnitRender(auRec.audioUnit,
inActionFlags,
inTimeStamp,
inBusNumber,
inNumFrames,
auRec.audioBufferList);
err = ExtAudioFileWriteAsync(auRec.extAudioFileRef,
inNumFrames,
auRec.audioBufferList);
return err;
(Then I close the file after recording at the same time I close the AudioUnit)
Now the strange thing is that all this works perfectly well in the simulator: I can record and play at the same time but on the device, the callback for recording is not ran (I check by trying to print something in the log in the callback function.) which men no writing in the file and an empty file in the end.
Any one has any idea of what could be causing this?
Thanks
Alexandre

Just in case some one might need it, I solved my problem:
I simply needed to initialize the AudioSession before playing/recording. I did so with the following code:
OSStatus err;
AudioSessionInitialize(NULL, NULL, MyInterruptionListener, self);
UInt32 sessionCategory = kAudioSessionCategory_PlayAndRecord;
err = AudioSessionSetProperty (kAudioSessionProperty_AudioCategory,
sizeof (sessionCategory),
&sessionCategory);
AudioSessionSetActive(TRUE);

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