public override void ViewDidLoad()
{
base.ViewDidLoad ();
var componentDescription = new AudioComponentDescription {
ComponentType = AudioComponentType.Effect,
ComponentSubType = 0x666c7472,
ComponentManufacturer = (AudioComponentManufacturerType)0x44656d6f,
ComponentFlags = 0,
ComponentFlagsMask = 0
};
AUAudioUnit.RegisterSubclass (
new Class (typeof(AUv3FilterDemo)),
componentDescription,
"Local FilterDemo",
int.MaxValue
);
EmbedPlugInView ();
playEngine = new SimplePlayEngine ();
playEngine.SelectEffectWithComponentDescription (componentDescription, ConnectParametersToControls);
playEngine.AudioUnit.TransportStateBlock = (ref AUHostTransportStateFlags transportStateFlags, ref double currentSamplePosition, ref double cycleStartBeatPosition, ref double cycleEndBeatPosition) => {
transportStateFlags = AUHostTransportStateFlags.Recording;
currentSamplePosition = 10.0;
cycleStartBeatPosition = 0.0;
cycleEndBeatPosition = 20.0;
return true;
};
}
bool createAUGraph ()
{
AUGraphError result = 0;
int samplerNode, ioNode;
var cd = new AudioComponentDescription () {
ComponentManufacturer = AudioComponentManufacturerType.Apple,
ComponentFlags = 0,
ComponentFlagsMask = 0
};
processingGraph = new AUGraph ();
cd.ComponentType = AudioComponentType.MusicDevice;
cd.ComponentSubType = (int)AudioTypeMusicDevice.Sampler; //0x73616d70;
samplerNode = processingGraph.AddNode (cd);
cd.ComponentType = AudioComponentType.Output;
cd.ComponentSubType = (int)AudioTypeOutput.Remote; //0x72696f63;
ioNode = processingGraph.AddNode (cd);
processingGraph.Open ();
result = processingGraph.ConnnectNodeInput (samplerNode, 0, ioNode, 0);
if (result != AUGraphError.OK)
throw new Exception ("Unable to open the audio processing graph. Error code: " + result);
samplerUnit = processingGraph.GetNodeInfo (samplerNode);
ioUnit = processingGraph.GetNodeInfo (ioNode);
return true;
}
bool CreateAUGraph ()
{
processingGraph = new AUGraph ();
int samplerNode, ioNode;
var musicSampler = new AudioComponentDescription () {
ComponentManufacturer = AudioComponentManufacturerType.Apple,
ComponentType = AudioComponentType.MusicDevice,
ComponentSubType = (int)AudioTypeMusicDevice.Sampler
};
samplerNode = processingGraph.AddNode (musicSampler);
var remoteOutput = new AudioComponentDescription () {
ComponentManufacturer = AudioComponentManufacturerType.Apple,
ComponentType = AudioComponentType.Output,
ComponentSubType = (int)AudioTypeOutput.Remote
};
ioNode = processingGraph.AddNode (remoteOutput);
processingGraph.Open ();
processingGraph.ConnnectNodeInput (
sourceNode: samplerNode,
sourceOutputNumber: 0,
destNode: ioNode,
destInputNumber: 0);
samplerUnit = processingGraph.GetNodeInfo (samplerNode);
return true;
}
void UpdateEffectsList ()
{
DispatchQueue.DefaultGlobalQueue.DispatchAsync (() => {
var anyEffectDescription = new AudioComponentDescription {
ComponentType = AudioComponentType.Effect,
ComponentSubType = 0,
ComponentManufacturer = 0,
ComponentFlags = 0,
ComponentFlagsMask = 0
};
availableEffects = AVAudioUnitComponentManager.SharedInstance.GetComponents (anyEffectDescription);
DispatchQueue.MainQueue.DispatchAsync (componentsFoundCallback);
});
}
public static AudioComponent FindNextComponent (AudioComponent cmp, AudioComponentDescription cd)
{
// Getting component hanlder
IntPtr handle;
if (cmp == null)
handle = AudioComponentFindNext(IntPtr.Zero, cd);
else
handle = AudioComponentFindNext(cmp.Handle, cd);
// creating an instance
if (handle != IntPtr.Zero)
return new AudioComponent (handle);
else
return null;
}
static int CountMatches(AudioComponentDescription desc)
{
if (desc == null)
throw new ArgumentNullException ("desc");
return AudioComponentCount (desc);
}
static extern IntPtr AudioComponentFindNext(IntPtr inComponent, AudioComponentDescription inDesc);
public static AudioComponent FindComponent(AudioComponentDescription cd)
{
return FindNextComponent(null, cd);
}
static extern AUGraphError AUGraphAddNode(IntPtr inGraph, AudioComponentDescription inDescription, out int outNode);
public static AudioComponent FindNextComponent(AudioComponent cmp, AudioComponentDescription cd)
{
return FindNextComponent (cmp, ref cd);
}
public void CopyTo (AudioComponentDescription cd)
{
cd.ComponentType = ComponentType;
cd.ComponentSubType = ComponentSubType;
cd.ComponentManufacturer = ComponentManufacturer;
cd.ComponentFlags = ComponentFlags;
cd.ComponentFlagsMask = ComponentFlagsMask;
}
public AVAudioUnitEffect(AudioComponentDescription desc)
: this(new AudioComponentDescriptionNative (desc))
{
}
public void SelectEffectWithComponentDescription (AudioComponentDescription? componentDescription, Action completionHandler)
{
if (isPlaying)
player.Pause ();
if (effect != null) {
engine.DisconnectNodeInput (effect);
engine.DisconnectNodeInput (engine.MainMixerNode);
engine.Connect (player, engine.MainMixerNode, file.ProcessingFormat);
engine.DetachNode (effect);
effect = null;
AudioUnit = null;
PresetList = new AUAudioUnitPreset[0];
}
if (componentDescription.HasValue) {
AVAudioUnit.FromComponentDescription (componentDescription.Value, AudioComponentInstantiationOptions.OutOfProcess, (avAudioUnitEffect, AVError) => {
if (AVError != null || avAudioUnitEffect == null) {
Console.WriteLine ("SelectEffectWithComponentDescription error!");
return;
}
effect = avAudioUnitEffect;
engine.AttachNode (avAudioUnitEffect);
engine.DisconnectNodeInput (engine.MainMixerNode);
engine.Connect (player, avAudioUnitEffect, file.ProcessingFormat);
engine.Connect (avAudioUnitEffect, engine.MainMixerNode, file.ProcessingFormat);
AudioUnit = avAudioUnitEffect.AUAudioUnit;
PresetList = avAudioUnitEffect.AUAudioUnit.FactoryPresets ?? new AUAudioUnitPreset[0];
Done (completionHandler);
});
} else {
Done (completionHandler);
}
}
static extern AUGraphError AUGraphAddNode(IntPtr inGraph, ref AudioComponentDescription inDescription, out int /* AUNode = SInt32* */ outNode);
// AudioComponentDescription struct in only correctly fixed for unified
// Following current Api behaviour of returning an AudioUnit instead of an error
public AudioUnit GetNodeInfo (int node, out AudioComponentDescription cd, out AUGraphError error)
{
if (Handle == IntPtr.Zero)
throw new ObjectDisposedException ("AUGraph");
IntPtr ptr;
error = AUGraphNodeInfo (Handle, node, out cd, out ptr);
if (error != AUGraphError.OK || ptr == IntPtr.Zero)
return null;
return new AudioUnit (ptr);
}
public int AddNode (AudioComponentDescription description)
{
int node;
#if XAMCORE_2_0
var err = AUGraphAddNode (handle, ref description, out node);
#else
var err = AUGraphAddNode (handle, description, out node);
#endif
if (err != 0)
throw new ArgumentException (String.Format ("Error code: {0}", err));
return node;
}
public AudioComponentDescriptionNative (AudioComponentDescription other)
{
this.ComponentType = other.ComponentType;
this.ComponentSubType = other.ComponentSubType;
this.ComponentManufacturer = other.ComponentManufacturer;
this.ComponentFlags = other.ComponentFlags;
this.ComponentFlagsMask = other.ComponentFlagsMask;
}
public AVAudioUnitGenerator(AudioComponentDescription desc)
: this(new AudioComponentDescriptionNative (desc))
{
}
public static AudioComponent FindNextComponent(AudioComponent cmp, ref AudioComponentDescription cd)
{
var handle = cmp == null ? IntPtr.Zero : cmp.Handle;
handle = AudioComponentFindNext (handle, ref cd);
return (handle != IntPtr.Zero) ? new AudioComponent (handle) : null;
}
public AVAudioUnitMidiInstrument(AudioComponentDescription desc)
: this(new AudioComponentDescriptionNative (desc))
{
}
public int AddNode(AudioComponentDescription description)
{
int node;
var err = AUGraphAddNode (handle, description, out node);
if (err != 0)
throw new ArgumentException(String.Format("Error code:", err));
return node;
}
public AVAudioUnitTimePitch(AudioComponentDescription desc)
: this(new AudioComponentDescriptionNative (desc))
{
}
static extern AUGraphError AUGraphNodeInfo(IntPtr inGraph, int inNode, out AudioComponentDescription outDescription, out IntPtr outAudioUnit);
public AVAudioUnitVarispeed(AudioComponentDescription desc)
: this(new AudioComponentDescriptionNative (desc))
{
}
static extern int AudioComponentCount(AudioComponentDescription desc);
static extern int AUGraphAddNode(IntPtr inGraph, AudioComponentDescription inDescription, ref int outNode);
static extern int AudioComponentGetDescription(IntPtr component, out AudioComponentDescription desc);
static extern int AUGraphNodeInfo(IntPtr inGraph, int inNode, AudioComponentDescription outDescription, IntPtr outAudioUnit);
public int AddNode(AudioComponentDescription cd)
{
int node = 0;
int err = AUGraphAddNode(handle, cd, ref node);
if (err != 0)
throw new ArgumentException(String.Format("Error code:", err));
return node;
}
public AUAudioUnit CreateAudioUnit (AudioComponentDescription desc, out NSError error)
{
AudioUnit = new AUv3FilterDemo (desc, 0, out error);
return AudioUnit;
}
