void prepareAUGraph()
{
// Creating audio graph instance
_auGraph = AUGraph.CreateInstance();
// Adding Remote IO node to AUGraph
AudioComponentDescription cd = new AudioComponentDescription()
{
componentType = AudioComponentDescription.AudioComponentType.kAudioUnitType_Output,
componentSubType = AudioComponentDescription.AudioComponentSubType.kAudioUnitSubType_RemoteIO,
componentManufacturer = AudioComponentDescription.AudioComponentManufacturerType.kAudioUnitManufacturer_Apple,
componentFlags = 0,
componentFlagsMask = 0
};
int remoteIONode = _auGraph.AddNode(cd);
// Preparing AudioComponentDescrption of MultiChannelMixer
cd.componentType = AudioComponentDescription.AudioComponentType.kAudioUnitType_Mixer;
cd.componentSubType = AudioComponentDescription.AudioComponentSubType.kAudioUnitSubType_MultiChannelMixer;
int multiChannelMixerNode = _auGraph.AddNode(cd);
// Setting callback method as the case of Audio Unit
for (int i = 0; i < _waveDef.Length; i++)
{
var callbackStruct = new AudioUnit.AURenderCallbackStrct();
callbackStruct.inputProc = device_renderCallback; // setting callback function
callbackStruct.inputProcRefCon = GCHandle.ToIntPtr(_handle); // a pointer that passed to the renderCallback (IntPtr inRefCon)
_auGraph.AUGraphSetNodeInputCallback(
multiChannelMixerNode,
(uint)i, // bus number
callbackStruct);
}
var _remoteIO = _auGraph.GetNodeInfo(remoteIONode);
var multiChannelMixerAudioUnit = _auGraph.GetNodeInfo(multiChannelMixerNode);
// Getting an AudioUnit canonical description
var audioFormat = AudioUnitUtils.AUCanonicalASBD(44100.0, 2);
// applying the audio format to each audio units
_remoteIO.SetAudioFormat(audioFormat, AudioUnit.AudioUnitScopeType.kAudioUnitScope_Input, 0);
multiChannelMixerAudioUnit.SetAudioFormat(audioFormat, AudioUnit.AudioUnitScopeType.kAudioUnitScope_Input, 0);
// connecting multiChannelMixerNode(bus:0) to remoteIONode(bus:0)
_auGraph.ConnnectNodeInput(
multiChannelMixerNode,
0, // output bus
remoteIONode,
0 // input bus
);
// graph initialization
_remoteIO.Initialize();
_auGraph.Initialize();
// mic setting
}
void prepareAudioUnit()
{
// AudioSession
AudioSession.Initialize();
AudioSession.SetActive(true);
AudioSession.Category = AudioSessionCategory.PlayAndRecord;
AudioSession.PreferredHardwareIOBufferDuration = 0.005f;
// creating an AudioComponentDescription of the RemoteIO AudioUnit
AudioComponentDescription cd = new AudioComponentDescription()
{
componentType = AudioComponentDescription.AudioComponentType.kAudioUnitType_Output,
componentSubType = AudioComponentDescription.AudioComponentSubType.kAudioUnitSubType_RemoteIO,
componentManufacturer = AudioComponentDescription.AudioComponentManufacturerType.kAudioUnitManufacturer_Apple,
componentFlags = 0,
componentFlagsMask = 0
};
// Getting AudioComponent using the audio component description
_audioComponent = AudioComponent.FindComponent(cd);
// creating an audio unit instance
_audioUnit = AudioUnit.CreateInstance(_audioComponent);
// turning on microphone
_audioUnit.SetEnableIO(true,
AudioUnit.AudioUnitScopeType.kAudioUnitScope_Input,
1 // Remote Input
);
// setting audio format
_audioUnit.SetAudioFormat(_dstFormat,
AudioUnit.AudioUnitScopeType.kAudioUnitScope_Input,
0 // Remote Output
);
_audioUnit.SetAudioFormat(AudioUnitUtils.AUCanonicalASBD(_sampleRate, 2),
AudioUnit.AudioUnitScopeType.kAudioUnitScope_Output,
1 // Remote input
);
// setting callback method
_audioUnit.RenderCallback += new EventHandler <AudioUnitEventArgs>(_audioUnit_RenderCallback);
_audioUnit.Initialize();
_audioUnit.Start();
}
void prepareExtAudioFile()
{
// Opening Audio File
_extAudioFile = ExtAudioFile.OpenURL(_url);
// Getting file data format
_srcFormat = _extAudioFile.FileDataFormat;
// Setting the channel number of the output format same to the input format
_dstFormat = AudioUnitUtils.AUCanonicalASBD(_sampleRate, _srcFormat.ChannelsPerFrame);
// setting reading format as audio unit cannonical format
_extAudioFile.ClientDataFormat = _dstFormat;
// getting total frame
_totalFrames = _extAudioFile.FileLengthFrames;
// Seeking to the file head
_extAudioFile.Seek(0);
}
void prepareAudioUnit()
{
// Creating AudioComponentDescription instance of RemoteIO Audio Unit
var cd = new AudioComponentDescription()
{
componentType = AudioComponentDescription.AudioComponentType.kAudioUnitType_Output,
componentSubType = AudioComponentDescription.AudioComponentSubType.kAudioUnitSubType_RemoteIO,
componentManufacturer = AudioComponentDescription.AudioComponentManufacturerType.kAudioUnitManufacturer_Apple,
componentFlags = 0,
componentFlagsMask = 0
};
// Getting AudioComponent from the description
_component = AudioComponent.FindComponent(cd);
// Getting Audiounit
_audioUnit = AudioUnit.CreateInstance(_component);
// turning on microphone
_audioUnit.SetEnableIO(true,
AudioUnit.AudioUnitScopeType.kAudioUnitScope_Input,
1 // Remote Input
);
// setting AudioStreamBasicDescription
var audioFormat = AudioUnitUtils.AUCanonicalASBD(44100.0, 2);
_audioUnit.SetAudioFormat(audioFormat,
AudioUnit.AudioUnitScopeType.kAudioUnitScope_Input,
0 // Remote output
);
_audioUnit.SetAudioFormat(audioFormat,
AudioUnit.AudioUnitScopeType.kAudioUnitScope_Output,
1 // Remote input
);
// setting callback
_audioUnit.RenderCallback += new EventHandler <AudioUnitEventArgs>(_audioUnit_RenderCallback);
// initialize
_audioUnit.Initialize();
}
protected override void init(DisposableI parent, Stream stream, int instanceCount, bool looped, Loader.LoadedCallbackMethod loadedCallback)
{
base.init(parent, stream, instanceCount, looped, loadedCallback);
try
{
audio = parent.FindParentOrSelfWithException <Audio>();
audio.UpdateCallback += Update;
this.data = base.data;
this.channels = base.channels;
this.bitDepth = base.bitDepth;
desc = AudioUnitUtils.AUCanonicalASBD(sampleRate, channels);
desc.FormatFlags = (AudioFormatFlags)((int)AudioFormatFlags.IsSignedInteger | (int)AudioFormatFlags.IsPacked | (int)AudioFormatFlags.IsNonInterleaved);
for (int i = 0; i != instanceCount; ++i)
{
inactiveInstances.AddLast(new SoundWAVInstance(this, looped));
}
}
catch (Exception e)
{
FailedToLoad = true;
Loader.AddLoadableException(e);
Dispose();
if (loadedCallback != null)
{
loadedCallback(this, false);
}
return;
}
Loaded = true;
if (loadedCallback != null)
{
loadedCallback(this, true);
}
}
void prepareExtAudioFile()
{
// Opening Audio File
_extAudioFile = ExtAudioFile.OpenURL(_url);
// Getting file data format
_srcFormat = _extAudioFile.FileDataFormat;
// Setting the channel number of the output format same to the input format
_dstFormat = AudioUnitUtils.AUCanonicalASBD(_sampleRate, _srcFormat.ChannelsPerFrame);
// setting reading format as audio unit cannonical format
_extAudioFile.ClientDataFormat = _dstFormat;
// getting total frame
_totalFrames = _extAudioFile.FileLengthFrames;
// Aloocating AudoBufferList
_buffer = new AudioBufferList((uint)_srcFormat.ChannelsPerFrame, (uint)(sizeof(uint) * _totalFrames));
_numberOfChannels = _srcFormat.ChannelsPerFrame;
// Reading all frame into the buffer
_extAudioFile.Read((uint)_totalFrames, _buffer);
}
