Apple

You've set something it doesn't like.

Take a look at this:

OSStatus SetDefaultInputDeviceAsCurrent(){
    UInt32 size;
    OSStatus err =noErr;
    size = sizeof(AudioDeviceID);

    AudioDeviceID inputDevice;
    err = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultInputDevice,
                                                  &size,
                                                  &inputDevice);

    if (err)
        return err;

    err =AudioUnitSetProperty(InputUnit,
                         kAudioOutputUnitProperty_CurrentDevice,
                         kAudioUnitScope_Global,
                         0,
                         &inputDevice,
                         sizeof(inputDevice));

   return err;

}

From http://developer.apple.com/library/mac/#technotes/tn2091/_index.html which is an article describing exactly what you want to do (using the HALOutput object to collect input.)

On 4 Dec 2012, at 04:56, John Nastos wrote:

I'm trying to build an AUGraph with the built-in input set as the device. Note that in the code example, I have the built-in input selected as the current input device in system preferences.

For some reason, this results in OSStatus -10851

If I switch the code around to use different inputs (Soundflower for example), it works fine -- no errors, I get audio in my callback, etc. Why is this failing for the built-in input?

Code below.

Thanks,
- John Nastos

- (void) initAudioGraph {
OSStatus status;

NewAUGraph(&inputAudioGraph);

AUNode ioNode;

AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;

desc.componentSubType = kAudioUnitSubType_HALOutput;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;

desc.componentManufacturer = kAudioUnitManufacturer_Apple;

status = AUGraphAddNode(inputAudioGraph, &desc, &ioNode);

NSLog(@"Add node %i",status);

status = AUGraphOpen(inputAudioGraph);
NSLog(@"Open graph %i",status);


status = AUGraphNodeInfo(inputAudioGraph, ioNode, NULL, &inputAudioUnit);
NSLog(@"Node info %i",status);



BOOL enable = true;
status = AudioUnitSetProperty(inputAudioUnit,
kAudioOutputUnitProperty_EnableIO,

kAudioUnitScope_Input,
1, &enable, sizeof(enable));
NSLog(@"Status (enable input): %i",(int)status);


enable = false;
status = AudioUnitSetProperty(inputAudioUnit,
kAudioOutputUnitProperty_EnableIO,

kAudioUnitScope_Output,
0, &enable, sizeof(enable));
NSLog(@"Status (enable output): %i",(int)status);


   AudioDeviceID input_device_id = kAudioObjectUnknown;

   AudioObjectPropertyAddress property_address = {

   kAudioHardwarePropertyDefaultInputDevice,
   kAudioObjectPropertyScopeGlobal,
   kAudioObjectPropertyElementMaster
   };

   int statusCounter = 0;

   UInt32 input_device_id_size = sizeof(input_device_id);
   status = AudioObjectGetPropertyData(kAudioObjectSystemObject, &property_address, 0, NULL, &input_device_id_size, &input_device_id);

   NSLog(@"Get default device status: %i -- %i",status,input_device_id);


   status = AudioUnitSetProperty(inputAudioUnit, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &input_device_id, sizeof(input_device_id));

   NSLog(@"%i Status (set current device): %i",statusCounter++,status);

/*
AudioDeviceID input_device_id = sourceID;

connectedInputDeviceID = input_device_id;

int statusCounter = 0;

status = AudioUnitSetProperty(inputAudioUnit, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &input_device_id, sizeof(input_device_id));

NSLog(@"%i Status (set current device): %i",statusCounter++,status);
*/

inputAudioFormat.mSampleRate= 44100.0f;

inputAudioFormat.mFormatID= kAudioFormatLinearPCM;
inputAudioFormat.mFormatFlags= kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;

inputAudioFormat.mFramesPerPacket= 1;
inputAudioFormat.mChannelsPerFrame= 1;

inputAudioFormat.mBitsPerChannel= 16;
inputAudioFormat.mBytesPerPacket= 2;

inputAudioFormat.mBytesPerFrame= 2;

status = AudioUnitSetProperty(inputAudioUnit,

kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, 1,
&inputAudioFormat, sizeof(inputAudioFormat));

NSLog(@"%i Status (format): %i",statusCounter++,status);

status = AUGraphInitialize(inputAudioGraph);


NSLog(@"Init input graph: %i",status);

CAShow(inputAudioGraph);


}

--
- John Nastos
http://johnnastos.com

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