16 channels of audio recording at the same time with a MAC BOOK?

Hi,
I want to know how many channels of audio I can record at the same-time with a MAC BOOK (2.16GHz Intel Core 2 Duo, 1GB memory 120GB hard drive, Double-layer SuperDrive), firewire audio device and Logic Pro 8?
You see I am aiming to record a live gig and I want to come into a firewire recording interface with 16 channels of audio all at the same time (24-bit, 44Khz) Does anyone know if this is possible? Or am I looking for trouble? No plug-ins will be used just record straight in. Anyone have some experience with this?
Thanks.

Ok, like this:
Macbook - FW Port - FW Cable -In- MOTU Traveler -Out- External Harddrive.
Firewire is capable of chaining units.
Also plugged into your motu traveler will be an optical cable coming from the ADA.
This will carry the 8 channels of audio it outputs.
Also another good thing to do is to also have an optical cable FROM the optical output of your Traveler into the Behringer's input.
That way you can sync the Behringer's digital clock to that of the Traveler, giving you a slightly better sounding signal that if you were to sync the traveler to the Behringer. This is simply because the traveler has a better quality digital clock than the Behringer unit so it's best to use that. To do this you just select "Adat input" on the back of the Behringer, and leave the Travelers sync to "Internal Clock". It is only a very very slight difference and you may not be able to notice the difference but for the cost of an optical cable it's worth doing.
It will all make a lot more sense when you have the two units and the harddrive all plugged in.

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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:
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_outputUnitComponentDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
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_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,
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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;
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sizeof (sessionCategory),
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s can I have timestamps for each sample?I mean,is there a notion of time information on this board?Finally,is there a way to know ,in the double buffer's case,the number of samples in the halfbuffer which is not full if the acquisition stops by a trigger?.PALE wrote:
>
> I am using the PCI-6110E/6111E with the NI-DAQ software version6.7.Is
> there a way to record at the same time analog and digital
> channels?If,yes can I have timestamps for each sample?I mean,is there
> a notion of time information on this board?Finally,is there a way to
> know ,in the double buffer's case,the number of samples in the
> halfbuffer which is not full if the acquisition stops by a trigger?.
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[email protected]

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>
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> gentle.
>
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16 channels of audio recording at the same time with a MAC BOOK?

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