void prepareAudioUnit ()
{
// AudioSession
AudioSession.Initialize ();
AudioSession.SetActive (true);
AudioSession.Category = AudioSessionCategory.PlayAndRecord;
AudioSession.PreferredHardwareIOBufferDuration = 0.005f;
// Getting AudioComponent Remote output
_audioComponent = AudioComponent.FindComponent (AudioTypeOutput.Remote);
// creating an audio unit instance
_audioUnit = new AudioUnit (_audioComponent);
// turning on microphone
_audioUnit.SetEnableIO (true,
AudioUnitScopeType.Input,
1 // Remote Input
);
// setting audio format
_audioUnit.SetAudioFormat (_dstFormat,
AudioUnitScopeType.Input,
0 // Remote Output
);
var format = AudioStreamBasicDescription.CreateLinearPCM (_sampleRate, bitsPerChannel: 32);
format.FormatFlags = AudioStreamBasicDescription.AudioFormatFlagsAudioUnitCanonical;
_audioUnit.SetAudioFormat (format, AudioUnitScopeType.Output, 1);
// setting callback method
_audioUnit.SetRenderCallback (_audioUnit_RenderCallback, AudioUnitScopeType.Global);
_audioUnit.Initialize ();
_audioUnit.Start ();
}
void SetupRemoteIO()
{
AudioComponentDescription desc = new AudioComponentDescription ();
desc.ComponentType = AudioComponentType.Output;
desc.ComponentSubType = 0x72696f63;
desc.ComponentManufacturer = AudioComponentManufacturerType.Apple;
desc.ComponentFlags = 0;
desc.ComponentFlagsMask = 0;
var component = AudioComponent.FindNextComponent (null, desc);
rioUnit = new AudioUnit (component);
rioUnit.SetEnableIO (true, AudioUnitScopeType.Input, 1);
rioUnit.SetRenderCallback (renderDelegate, AudioUnitScopeType.Input, 0);
audioFormat = new AudioStreamBasicDescription();
audioFormat.Format = AudioFormatType.LinearPCM;
audioFormat.SampleRate = sampleRate;
audioFormat.ChannelsPerFrame = 2;
audioFormat.FramesPerPacket = 1;
audioFormat.BitsPerChannel = 8 * sizeof(int);
audioFormat.BytesPerPacket = sizeof(int);
audioFormat.BytesPerFrame = sizeof(int);
audioFormat.FormatFlags = AudioStreamBasicDescription.AudioFormatFlagsAudioUnitCanonical;
rioUnit.SetAudioFormat (audioFormat, AudioUnitScopeType.Input, 0);
rioUnit.SetAudioFormat (audioFormat, AudioUnitScopeType.Output, 1);
rioUnit.Initialize ();
unitCreated = true;
FFTBufferManager = new FFTBufferManager (maxFPS, this);
FFTBufferManager.Setup ();
rioUnit.Start ();
unitIsRunning = true;
}
void prepareAudioUnit()
{
// Updated for deprecated AudioSession
var session = AVAudioSession.SharedInstance();
NSError error;
if (session == null)
{
var alert = new UIAlertView("Session error", "Unable to create audio session", null, "Cancel");
alert.Show();
alert.Clicked += delegate
{
alert.DismissWithClickedButtonIndex(0, true);
return;
};
}
session.SetActive(true);
session.SetCategory(AVAudioSessionCategory.PlayAndRecord);
session.SetPreferredIOBufferDuration(0.005, out error);
// Getting AudioComponent Remote output
_audioComponent = AudioComponent.FindComponent(AudioTypeOutput.Remote);
// creating an audio unit instance
_audioUnit = new AudioUnit(_audioComponent);
// turning on microphone
_audioUnit.SetEnableIO(true,
AudioUnitScopeType.Input,
1 // Remote Input
);
// setting audio format
_audioUnit.SetAudioFormat(_dstFormat,
AudioUnitScopeType.Input,
0 // Remote Output
);
var format = AudioStreamBasicDescription.CreateLinearPCM(_sampleRate, bitsPerChannel: 32);
format.FormatFlags = AudioStreamBasicDescription.AudioFormatFlagsNativeFloat;
_audioUnit.SetAudioFormat(format, AudioUnitScopeType.Output, 1);
// setting callback method
_audioUnit.SetRenderCallback(_audioUnit_RenderCallback, AudioUnitScopeType.Global);
_audioUnit.Initialize();
_audioUnit.Start();
}