internal SoundInstance(Sound staticSound, AudioListener listener, bool forceLoadInMemory)
{
Listener = listener;
engine = staticSound.AudioEngine;
sound = staticSound;
spatialized = staticSound.Spatialized;
var streamed = staticSound.StreamFromDisk && !forceLoadInMemory;
if (engine.State == AudioEngineState.Invalidated)
return;
Source = AudioLayer.SourceCreate(listener.Listener, staticSound.SampleRate, streamed ? CompressedSoundSource.NumberOfBuffers : 1, staticSound.Channels == 1, spatialized, streamed);
if (Source.Ptr == IntPtr.Zero)
{
throw new Exception("Failed to create an AudioLayer Source");
}
if (streamed)
{
soundSource = new CompressedSoundSource(this, staticSound.CompressedDataUrl, staticSound.NumberOfPackets, staticSound.SampleRate, staticSound.Channels, staticSound.MaxPacketLength);
}
else
{
if (sound.PreloadedBuffer.Ptr == IntPtr.Zero)
{
staticSound.LoadSoundInMemory(); //this should be already loaded by the serializer, but in the case of forceLoadInMemory might not be the case yet.
}
AudioLayer.SourceSetBuffer(Source, staticSound.PreloadedBuffer);
}
ResetStateToDefault();
}
/// <summary>
/// Create the audio engine to the sound base instance.
/// </summary>
/// <param name="engine">A valid AudioEngine</param>
/// <exception cref="ArgumentNullException">The engine argument is null</exception>
internal void AttachEngine(AudioEngine engine)
{
if (engine == null)
throw new ArgumentNullException("engine");
AudioEngine = engine;
}
/// <summary>
/// Create an new instance of AudioSystem
/// </summary>
/// <param name="registry">The service registry in which to register the <see cref="AudioSystem"/> services</param>
public AudioSystem(IServiceRegistry registry)
: base(registry)
{
Enabled = true;
AudioEngine = new AudioEngine();
registry.AddService(typeof(AudioSystem), this);
}
public override void Initialize()
{
base.Initialize();
AudioEngine = AudioEngineFactory.NewAudioEngine();
Game.Activated += OnActivated;
Game.Deactivated += OnDeactivated;
}
/// <summary>
/// Create and Load a sound effect from an input wav stream.
/// </summary>
/// <param name="engine">Name of the audio engine in which to create the sound effect</param>
/// <param name="stream">A stream corresponding to a wav file.</param>
/// <returns>A new instance soundEffect ready to be played</returns>
/// <exception cref="ArgumentNullException"><paramref name="engine"/> or <paramref name="stream"/> is null.</exception>
/// <exception cref="NotSupportedException">The wave file or has more than 2 channels or is not encoded in 16bits.</exception>
/// <exception cref="InvalidOperationException">The content of the stream does not correspond to a valid wave file.</exception>
/// <exception cref="OutOfMemoryException">There is not enough memory anymore to load the specified file in memory. </exception>
/// <exception cref="ObjectDisposedException">The audio engine has already been disposed</exception>
/// <remarks>Supported WAV files' audio format is the 16bits PCM format.</remarks>
public static SoundEffect Load(AudioEngine engine, Stream stream)
{
if(engine == null)
throw new ArgumentNullException(nameof(engine));
var newSdEff = new SoundEffect();
newSdEff.AttachEngine(engine);
newSdEff.Load(stream);
return newSdEff;
}
/// <summary>
/// Create the audio engine to the sound base instance.
/// </summary>
/// <param name="engine">A valid AudioEngine</param>
/// <exception cref="ArgumentNullException">The engine argument is null</exception>
/// <exception cref="ArgumentException">The engine argument is not an instance of AudioEngineWindows</exception>
internal void AttachEngine(AudioEngine engine)
{
if (engine == null)
throw new ArgumentNullException("engine");
AudioEngineWindows e = engine as AudioEngineWindows;
if (e == null)
{
throw new ArgumentException("Invalid type, expected AudioEngineWindows", "enging");
}
AudioEngine = e;
}
/// <summary>
/// Initializes a new instance of the <see cref="SoundInstance"/> class using a dynamic sound source.
/// </summary>
/// <param name="engine">The audio engine that will be used to play this instance</param>
/// <param name="listener">The listener of this instance</param>
/// <param name="dynamicSoundSource">The source from where the PCM data will be fetched</param>
/// <param name="sampleRate">The sample rate of this audio stream</param>
/// <param name="mono">Set to true if the souce is mono, false if stereo</param>
/// <param name="spatialized">If the SoundInstance will be used for spatialized audio set to true, if not false, if true mono must also be true</param>
public SoundInstance(AudioEngine engine, AudioListener listener, DynamicSoundSource dynamicSoundSource, int sampleRate, bool mono, bool spatialized = false)
{
Listener = listener;
this.engine = engine;
this.spatialized = spatialized;
soundSource = dynamicSoundSource;
if (engine.State == AudioEngineState.Invalidated)
return;
Source = AudioLayer.SourceCreate(listener.Listener, sampleRate, dynamicSoundSource.MaxNumberOfBuffers, mono, spatialized, true);
if (Source.Ptr == IntPtr.Zero)
{
throw new Exception("Failed to create an AudioLayer Source");
}
ResetStateToDefault();
}
public AudioListener(AudioEngine engine)
{
if (engine.State == AudioEngineState.Invalidated) return;
#if SILICONSTUDIO_PLATFORM_IOS
if (engine.DefaultListener == null)
{
Listener = AudioLayer.ListenerCreate(engine.AudioDevice);
AudioLayer.ListenerEnable(Listener);
}
else
{
Listener = engine.DefaultListener.Listener;
}
#else
Listener = AudioLayer.ListenerCreate(engine.AudioDevice);
AudioLayer.ListenerEnable(Listener);
#endif
}
/// <summary>
/// Create and Load a sound music from an input file.
/// </summary>
/// <param name="engine">The audio engine in which to load the soundMusic</param>
/// <param name="stream">The stream.</param>
/// <returns>A new instance of soundMusic ready to be played</returns>
/// <exception cref="System.ArgumentNullException">engine
/// or
/// filename</exception>
/// <exception cref="System.ObjectDisposedException">The AudioEngine in which to create the voice is disposed.</exception>
/// <exception cref="System.ArgumentException">engine or stream</exception>
/// <exception cref="ObjectDisposedException">The AudioEngine in which to create the voice is disposed.</exception>
/// <exception cref="ArgumentNullException">File ' + filename + ' does not exist.</exception>
/// <remarks>On all platform the wav format is supported.
/// For compressed formats, it is the task of the build engine to automatically adapt the original files to the best hardware specific format.</remarks>
public static SoundMusic Load(AudioEngine engine, Stream stream)
{
if(engine == null)
throw new ArgumentNullException("engine");
if (stream == null)
throw new ArgumentNullException("stream");
if(engine.IsDisposed)
throw new ObjectDisposedException("The AudioEngine in which to create the voice is disposed.");
// TODO: Not portable on WindowsStore
var ret = new SoundMusic();
ret.AttachEngine(engine);
ret.Load(stream);
return ret;
}
/// <summary>
/// Initializes a new instance of the <see cref="SoundInstance"/> class using a dynamic sound source.
/// </summary>
/// <param name="engine">The audio engine that will be used to play this instance</param>
/// <param name="listener">The listener of this instance</param>
/// <param name="dynamicSoundSource">The source from where the PCM data will be fetched</param>
/// <param name="sampleRate">The sample rate of this audio stream</param>
/// <param name="mono">Set to true if the souce is mono, false if stereo</param>
/// <param name="spatialized">If the SoundInstance will be used for spatialized audio set to true, if not false, if true mono must also be true</param>
/// <param name="useHrtf">If the engine should use Hrtf for spatialization</param>
/// <param name="directionalFactor"></param>
/// <param name="environment"></param>
public SoundInstance(AudioEngine engine, AudioListener listener, DynamicSoundSource dynamicSoundSource, int sampleRate, bool mono, bool spatialized = false, bool useHrtf = false, float directionalFactor = 0.0f, HrtfEnvironment environment = HrtfEnvironment.Small)
{
Listener = listener;
this.engine = engine;
this.spatialized = spatialized;
soundSource = dynamicSoundSource;
if (engine.State == AudioEngineState.Invalidated)
{
return;
}
Source = AudioLayer.SourceCreate(listener.Listener, sampleRate, dynamicSoundSource.MaxNumberOfBuffers, mono, spatialized, true, useHrtf, directionalFactor, environment);
if (Source.Ptr == IntPtr.Zero)
{
throw new Exception("Failed to create an AudioLayer Source");
}
ResetStateToDefault();
}
/// <summary>
/// Initializes a new instance of the <see cref="SoundInstance"/> class using a dynamic sound source.
/// </summary>
/// <param name="engine">The audio engine that will be used to play this instance</param>
/// <param name="listener">The listener of this instance</param>
/// <param name="dynamicSoundSource">The source from where the PCM data will be fetched</param>
/// <param name="sampleRate">The sample rate of this audio stream</param>
/// <param name="mono">Set to true if the souce is mono, false if stereo</param>
/// <param name="spatialized">If the SoundInstance will be used for spatialized audio set to true, if not false, if true mono must also be true</param>
public SoundInstance(AudioEngine engine, AudioListener listener, DynamicSoundSource dynamicSoundSource, int sampleRate, bool mono, bool spatialized = false)
{
Listener = listener;
this.engine = engine;
this.spatialized = spatialized;
soundSource = dynamicSoundSource;
if (engine.State == AudioEngineState.Invalidated)
{
return;
}
Source = AudioLayer.SourceCreate(listener.Listener, sampleRate, dynamicSoundSource.MaxNumberOfBuffers, mono, spatialized, true);
if (Source.Ptr == IntPtr.Zero)
{
throw new Exception("Failed to create an AudioLayer Source");
}
ResetStateToDefault();
}
public override void Initialize()
{
base.Initialize();
lock (AudioEngineStaticLock)
{
if (audioEngineSingleton == null)
{
audioEngineSingleton = AudioEngineFactory.NewAudioEngine(RequestedAudioDevice);
}
else
{
((IReferencable)audioEngineSingleton).AddReference();
}
AudioEngine = audioEngineSingleton;
}
Game.Activated += OnActivated;
Game.Deactivated += OnDeactivated;
}
public override void Initialize()
{
base.Initialize();
lock (AudioEngineStaticLock)
{
if (audioEngineSingleton == null)
{
audioEngineSingleton = AudioEngineFactory.NewAudioEngine(RequestedAudioDevice);
}
else
{
((IReferencable)audioEngineSingleton).AddReference();
}
AudioEngine = audioEngineSingleton;
}
Game.Activated += OnActivated;
Game.Deactivated += OnDeactivated;
}
internal override void PlayImpl()
{
AudioEngine.SubmitMusicActionRequest(new SoundMusicActionRequest(this, SoundMusicAction.Play));
// Actual Playing is happening during the Audio Engine update
// but we can not wait this long to update the PlayState of the currently playing SoundMusic
// after this call to Play, PlayState of the previous playing music should directly be set to Stopped
// this is why we use here the static field PreviousPlayingInstance
lock (PreviousPlayingInstanceLock) // protection again possible future multithreading.
{
if (previousPlayingInstance != this)
{
if (previousPlayingInstance != null)
{
previousPlayingInstance.SetStateToStopped();
}
previousPlayingInstance = this;
}
}
}
public AudioListener(AudioEngine engine)
{
if (engine.State == AudioEngineState.Invalidated)
{
return;
}
#if SILICONSTUDIO_PLATFORM_IOS
if (engine.DefaultListener == null)
{
Listener = AudioLayer.ListenerCreate(engine.AudioDevice);
AudioLayer.ListenerEnable(Listener);
}
else
{
Listener = engine.DefaultListener.Listener;
}
#else
Listener = AudioLayer.ListenerCreate(engine.AudioDevice);
AudioLayer.ListenerEnable(Listener);
#endif
}
public override void Initialize()
{
base.Initialize();
lock (AudioEngineStaticLock)
{
if (audioEngineSingleton == null)
{
var settings = ((Game)Game)?.Settings?.Configurations?.Get <AudioEngineSettings>();
audioEngineSingleton = AudioEngineFactory.NewAudioEngine(RequestedAudioDevice, settings != null && settings.HrtfSupport ? AudioLayer.DeviceFlags.Hrtf : AudioLayer.DeviceFlags.None);
}
else
{
((IReferencable)audioEngineSingleton).AddReference();
}
AudioEngine = audioEngineSingleton;
}
Game.Activated += OnActivated;
Game.Deactivated += OnDeactivated;
}
internal override void DestroyImpl()
{
AudioEngine.UnregisterSound(this);
IsDisposing = true;
lock (WorkerLock) // avoid to have simultaneous destroy and submit buffer (via BufferNeeded of working thread).
{
base.DestroyImpl();
}
Interlocked.Decrement(ref numberOfInstances);
if (numberOfInstances == 0)
{
awakeWorkerThread.Set();
if (!workerTask.Wait(500))
{
throw new AudioSystemInternalException("The DynamicSoundEffectInstance worker did not complete in allowed time.");
}
awakeWorkerThread.Dispose();
}
}
/// <summary>
/// Create a dynamic sound effect instance with the given sound properties.
/// </summary>
/// <param name="engine">The engine in which the dynamicSoundEffectInstance is created</param>
/// <param name="sampleRate">Sample rate, in Hertz (Hz), of audio content. Must between 8000 Hz and 48000 Hz</param>
/// <param name="channels">Number of channels in the audio data.</param>
/// <param name="encoding">Encoding of a sound data sample</param>
/// <returns>A new DynamicSoundEffectInstance instance ready to filled with data and then played</returns>
/// <exception cref="ArgumentOutOfRangeException">This exception is thrown for one of the following reason:
/// <list type="bullet">
/// <item>The value specified for sampleRate is less than 8000 Hz or greater than 48000 Hz. </item>
/// <item>The value specified for channels is something other than mono or stereo. </item>
/// <item>The value specified for data encoding is something other than 8 or 16 bits. </item>
/// </list>
/// </exception>
/// <exception cref="ArgumentNullException"><paramref name="engine"/> is null.</exception>
public DynamicSoundEffectInstance(AudioEngine engine, int sampleRate, AudioChannels channels, AudioDataEncoding encoding)
{
AttachEngine(engine);
if (sampleRate < 8000 || 48000 < sampleRate)
throw new ArgumentOutOfRangeException("sampleRate");
if(channels != AudioChannels.Mono && channels != AudioChannels.Stereo)
throw new ArgumentOutOfRangeException("channels");
if(encoding != AudioDataEncoding.PCM_8Bits && encoding != AudioDataEncoding.PCM_16Bits)
throw new ArgumentOutOfRangeException("encoding");
waveFormat = new WaveFormat(sampleRate, (int)encoding, (int)channels);
Interlocked.Increment(ref totalNbOfInstances);
Interlocked.Increment(ref numberOfInstances);
// first instance of dynamic sound effect instance => we create the workerThead and the associated event.
if (numberOfInstances == 1)
{
instancesNeedingBuffer = new ThreadSafeQueue<DynamicSoundEffectInstance>(); // to be sure that there is no remaining request from previous sessions
awakeWorkerThread = new AutoResetEvent(false);
CreateWorkerThread();
}
Name = "Dynamic Sound Effect Instance - "+totalNbOfInstances;
CreateVoice(WaveFormat);
InitializeDynamicSound();
AudioEngine.RegisterSound(this);
ResetStateToDefault();
}
internal override void PauseImpl()
{
AudioEngine.SubmitMusicActionRequest(new SoundMusicActionRequest(this, SoundMusicAction.Pause));
}
private void OnDeactivated(object sender, EventArgs e)
{
// pause the audio
AudioEngine.PauseAudio();
AudioEngine.Update(); // force the update of the audio to pause the Musics
}
private void OnActivated(object sender, EventArgs e)
{
// resume the audio
AudioEngine.ResumeAudio();
}
public override void Update(GameTime gameTime)
{
base.Update(gameTime);
AudioEngine.Update();
}
internal override void DestroyImpl()
{
AudioEngine.UnregisterSound(this);
// mediaInputStream is disposed by AudioEngine.ProcessPlayerClosed()
}
public AudioVoice(AudioEngine engine, SoundEffectInstance effectInstance, WaveFormat desiredFormat)
{
if (engine == null) throw new ArgumentNullException("engine");
if (desiredFormat == null) throw new ArgumentNullException("desiredFormat");
audioEngine = engine;
soundEffectInstance = effectInstance;
waveFormat = desiredFormat;
BusIndexMixer = uint.MaxValue;
if (desiredFormat.BitsPerSample != 16)
throw new AudioSystemInternalException("Invalid Audio Format. " + desiredFormat.BitsPerSample + " bits by sample is not supported.");
lock (StaticMembersLock)
{
if (nbOfInstances == 0)
{
// Create the Audio Graph
audioGraph = new AUGraph();
// Open the graph (does not initialize it yet)
audioGraph.Open();
// Create the AudioComponentDescrition corresponding to the IO Remote output and MultiChannelMixer
var remoteInOutComponentDesc = AudioComponentDescription.CreateOutput(AudioTypeOutput.Remote);
var mixerMultiChannelComponentDesc = AudioComponentDescription.CreateMixer(AudioTypeMixer.MultiChannel);
var mixer3DComponentDesc = AudioComponentDescription.CreateMixer(AudioTypeMixer.Spacial);
// Add the Audio Unit nodes to the AudioGraph
var outputUnitNodeId = audioGraph.AddNode(remoteInOutComponentDesc);
var idChannelMixerNode = audioGraph.AddNode(mixerMultiChannelComponentDesc);
var id3DMixerNode = audioGraph.AddNode(mixer3DComponentDesc);
// Connect the nodes together
CheckGraphError(audioGraph.ConnnectNodeInput(idChannelMixerNode, 0, outputUnitNodeId, 0), "Connection of the graph node failed.");
CheckGraphError(audioGraph.ConnnectNodeInput(id3DMixerNode, 0, idChannelMixerNode, MaxNumberOfTracks), "Connection of the graph node failed.");
// Get the MixerUnit objects
unitChannelMixer = audioGraph.GetNodeInfo(idChannelMixerNode);
unit3DMixer = audioGraph.GetNodeInfo(id3DMixerNode);
// Set the mixers' output formats (the stream format is propagated along the linked input during the graph initialization)
var desiredSampleRate = (engine.AudioSampleRate != 0) ? engine.AudioSampleRate : AudioUnitOutputSampleRate;
unit3DMixer.SetAudioFormat(CreateLinear16BitsPcm(2, desiredSampleRate), AudioUnitScopeType.Output);
unitChannelMixer.SetAudioFormat(CreateLinear16BitsPcm(2, desiredSampleRate), AudioUnitScopeType.Output);
// set the element count to the max number of possible tracks before initializing the audio graph
CheckUnitStatus(unitChannelMixer.SetElementCount(AudioUnitScopeType.Input, MaxNumberOfTracks+1), string.Format("Failed to set element count on ChannelMixer [{0}]", MaxNumberOfTracks+1)); // +1 for the 3DMixer output
CheckUnitStatus(unit3DMixer.SetElementCount(AudioUnitScopeType.Input, MaxNumberOfTracks), string.Format("Failed to set element count on 3DMixer [{0}]", MaxNumberOfTracks));
// set a null renderer callback to the channel and 3d mixer input bus
for (uint i = 0; i < MaxNumberOfTracks; i++)
{
CheckUnitStatus((AudioUnitStatus)SetInputRenderCallbackToNull(unit3DMixer.Handle, i), "Failed to set the render callback");
CheckUnitStatus((AudioUnitStatus)SetInputRenderCallbackToNull(unitChannelMixer.Handle, i), "Failed to set the render callback");
}
// Initialize the graph (validation of the topology)
CheckGraphError(audioGraph.Initialize(), "The audio graph initialization failed.");
// Start audio rendering
CheckGraphError(audioGraph.Start(), "Audio Graph could not start.");
// disable all the input bus at the beginning
for (uint i = 0; i < MaxNumberOfTracks; i++)
{
CheckUnitStatus(unitChannelMixer.SetParameter(AudioUnitParameterType.MultiChannelMixerEnable, 0f, AudioUnitScopeType.Input, i), "Failed to enable/disable the ChannelMixerInput.");
CheckUnitStatus(unit3DMixer.SetParameter(AudioUnitParameterType.Mixer3DEnable, 0f, AudioUnitScopeType.Input, i), "Failed to enable/disable the 3DMixerInput.");
}
// At initialization all UnitElement are available.
availableMixerBusIndices = new Queue<uint>();
for (uint i = 0; i < MaxNumberOfTracks; i++)
availableMixerBusIndices.Enqueue(i);
}
++nbOfInstances;
// Create a AudioDataRendererInfo for the sounds.
pAudioDataRendererInfo = (AudioDataRendererInfo*)Utilities.AllocateClearedMemory(sizeof(AudioDataRendererInfo));
pAudioDataRendererInfo->HandleChannelMixer = unitChannelMixer.Handle;
pAudioDataRendererInfo->Handle3DMixer = unit3DMixer.Handle;
}
}
internal void Attach(AudioEngine engine)
{
AttachEngine(engine);
Name = "Sound Effect " + Interlocked.Add(ref soundEffectCreationCount, 1);
// register the sound to the AudioEngine so that it will be properly freed if AudioEngine is disposed before this.
AudioEngine.RegisterSound(this);
}
// called on dispose
protected override void Destroy()
{
Game.Activated -= OnActivated;
Game.Deactivated -= OnDeactivated;
base.Destroy();
lock (AudioEngineStaticLock)
{
AudioEngine = null;
var count = ((IReferencable)audioEngineSingleton).Release();
if (count == 0)
{
audioEngineSingleton = null;
}
}
}
internal override void StopImpl()
{
ShouldExitLoop = false;
AudioEngine.SubmitMusicActionRequest(new SoundMusicActionRequest(this, SoundMusicAction.Stop));
}
internal override void UpdateVolume()
{
AudioEngine.SubmitMusicActionRequest(new SoundMusicActionRequest(this, SoundMusicAction.Volume));
}
// called on dispose
protected override void Destroy()
{
Game.Activated -= OnActivated;
Game.Deactivated -= OnDeactivated;
base.Destroy();
AudioEngine.Dispose();
AudioEngine = null;
}
public AudioVoice(AudioEngine engine, SoundEffectInstance effectInstance, WaveFormat desiredFormat)
{
if (engine == null)
{
throw new ArgumentNullException("engine");
}
if (desiredFormat == null)
{
throw new ArgumentNullException("desiredFormat");
}
audioEngine = engine;
soundEffectInstance = effectInstance;
waveFormat = desiredFormat;
BusIndexMixer = uint.MaxValue;
if (desiredFormat.BitsPerSample != 16)
{
throw new AudioSystemInternalException("Invalid Audio Format. " + desiredFormat.BitsPerSample + " bits by sample is not supported.");
}
lock (StaticMembersLock)
{
if (nbOfInstances == 0)
{
// Create the Audio Graph
audioGraph = new AUGraph();
// Open the graph (does not initialize it yet)
audioGraph.Open();
// Create the AudioComponentDescrition corresponding to the IO Remote output and MultiChannelMixer
var remoteInOutComponentDesc = AudioComponentDescription.CreateOutput(AudioTypeOutput.Remote);
var mixerMultiChannelComponentDesc = AudioComponentDescription.CreateMixer(AudioTypeMixer.MultiChannel);
var mixer3DComponentDesc = AudioComponentDescription.CreateMixer(AudioTypeMixer.Spacial);
// Add the Audio Unit nodes to the AudioGraph
var outputUnitNodeId = audioGraph.AddNode(remoteInOutComponentDesc);
var idChannelMixerNode = audioGraph.AddNode(mixerMultiChannelComponentDesc);
var id3DMixerNode = audioGraph.AddNode(mixer3DComponentDesc);
// Connect the nodes together
CheckGraphError(audioGraph.ConnnectNodeInput(idChannelMixerNode, 0, outputUnitNodeId, 0), "Connection of the graph node failed.");
CheckGraphError(audioGraph.ConnnectNodeInput(id3DMixerNode, 0, idChannelMixerNode, MaxNumberOfTracks), "Connection of the graph node failed.");
// Get the MixerUnit objects
unitChannelMixer = audioGraph.GetNodeInfo(idChannelMixerNode);
unit3DMixer = audioGraph.GetNodeInfo(id3DMixerNode);
// Set the mixers' output formats (the stream format is propagated along the linked input during the graph initialization)
var desiredSampleRate = (engine.AudioSampleRate != 0) ? engine.AudioSampleRate : AudioUnitOutputSampleRate;
unit3DMixer.SetAudioFormat(CreateLinear16BitsPcm(2, desiredSampleRate), AudioUnitScopeType.Output);
unitChannelMixer.SetAudioFormat(CreateLinear16BitsPcm(2, desiredSampleRate), AudioUnitScopeType.Output);
// set the element count to the max number of possible tracks before initializing the audio graph
CheckUnitStatus(unitChannelMixer.SetElementCount(AudioUnitScopeType.Input, MaxNumberOfTracks + 1), string.Format("Failed to set element count on ChannelMixer [{0}]", MaxNumberOfTracks + 1)); // +1 for the 3DMixer output
CheckUnitStatus(unit3DMixer.SetElementCount(AudioUnitScopeType.Input, MaxNumberOfTracks), string.Format("Failed to set element count on 3DMixer [{0}]", MaxNumberOfTracks));
// set a null renderer callback to the channel and 3d mixer input bus
for (uint i = 0; i < MaxNumberOfTracks; i++)
{
CheckUnitStatus((AudioUnitStatus)SetInputRenderCallbackToNull(unit3DMixer.Handle, i), "Failed to set the render callback");
CheckUnitStatus((AudioUnitStatus)SetInputRenderCallbackToNull(unitChannelMixer.Handle, i), "Failed to set the render callback");
}
// Initialize the graph (validation of the topology)
CheckGraphError(audioGraph.Initialize(), "The audio graph initialization failed.");
// Start audio rendering
CheckGraphError(audioGraph.Start(), "Audio Graph could not start.");
// disable all the input bus at the beginning
for (uint i = 0; i < MaxNumberOfTracks; i++)
{
CheckUnitStatus(unitChannelMixer.SetParameter(AudioUnitParameterType.MultiChannelMixerEnable, 0f, AudioUnitScopeType.Input, i), "Failed to enable/disable the ChannelMixerInput.");
CheckUnitStatus(unit3DMixer.SetParameter(AudioUnitParameterType.Mixer3DEnable, 0f, AudioUnitScopeType.Input, i), "Failed to enable/disable the 3DMixerInput.");
}
// At initialization all UnitElement are available.
availableMixerBusIndices = new Queue <uint>();
for (uint i = 0; i < MaxNumberOfTracks; i++)
{
availableMixerBusIndices.Enqueue(i);
}
}
++nbOfInstances;
// Create a AudioDataRendererInfo for the sounds.
pAudioDataRendererInfo = (AudioDataRendererInfo *)Utilities.AllocateClearedMemory(sizeof(AudioDataRendererInfo));
pAudioDataRendererInfo->HandleChannelMixer = unitChannelMixer.Handle;
pAudioDataRendererInfo->Handle3DMixer = unit3DMixer.Handle;
}
}