StephaneLenclud@277: using System;
StephaneLenclud@277: using System.Collections.Generic;
StephaneLenclud@277: using System.Linq;
StephaneLenclud@277: using System.Text;
StephaneLenclud@277: using System.Threading.Tasks;
StephaneLenclud@277: 
StephaneLenclud@277: //CSCore
StephaneLenclud@277: using CSCore;
StephaneLenclud@277: using CSCore.Win32;
StephaneLenclud@277: using CSCore.DSP;
StephaneLenclud@277: using CSCore.Streams;
StephaneLenclud@277: using CSCore.CoreAudioAPI;
StephaneLenclud@277: using CSCore.SoundIn;
StephaneLenclud@277: // Visualization
StephaneLenclud@277: using Visualization;
StephaneLenclud@277: 
StephaneLenclud@277: 
StephaneLenclud@277: namespace SharpDisplayManager
StephaneLenclud@277: {
StephaneLenclud@277:     class AudioManager
StephaneLenclud@277:     {
StephaneLenclud@277:         // Volume management
StephaneLenclud@277:         private MMDeviceEnumerator iMultiMediaDeviceEnumerator;
StephaneLenclud@277:         private MMNotificationClient iMultiMediaNotificationClient;
StephaneLenclud@277:         private MMDevice iMultiMediaDevice;
StephaneLenclud@277:         private AudioEndpointVolume iAudioEndpointVolume;
StephaneLenclud@277:         private AudioEndpointVolumeCallback iAudioEndpointVolumeCallback;
StephaneLenclud@277:         EventHandler<DefaultDeviceChangedEventArgs> iDefaultDeviceChangedHandler;
StephaneLenclud@277:         EventHandler<AudioEndpointVolumeCallbackEventArgs> iVolumeChangedHandler;
StephaneLenclud@277: 
StephaneLenclud@277:         // Audio visualization
StephaneLenclud@277:         private WasapiCapture iSoundIn;
StephaneLenclud@277:         private IWaveSource iWaveSource;
StephaneLenclud@277:         private LineSpectrum iLineSpectrum;
StephaneLenclud@278:         private int iVisualizerCount = 0;
StephaneLenclud@277: 
StephaneLenclud@277:         public LineSpectrum Spectrum { get { return iLineSpectrum; } }
StephaneLenclud@277:         public AudioEndpointVolume Volume { get { return iAudioEndpointVolume; } }
StephaneLenclud@277:         public MMDevice DefaultDevice { get { return iMultiMediaDevice; } }
StephaneLenclud@277: 
StephaneLenclud@277:         /// <summary>
StephaneLenclud@278:         /// Increment our visualizer count
StephaneLenclud@278:         /// </summary>
StephaneLenclud@278:         public void AddVisualizer()
StephaneLenclud@278:         {
StephaneLenclud@278:             if (iVisualizerCount == 0)
StephaneLenclud@278:             {
StephaneLenclud@278:                 // If we need at least one visualizer then we need to start our engine.
StephaneLenclud@278:                 StartAudioVisualization();
StephaneLenclud@278:             }
StephaneLenclud@278: 
StephaneLenclud@278:             //TODO: Check bounds?
StephaneLenclud@278:             iVisualizerCount++;
StephaneLenclud@278:         }
StephaneLenclud@278: 
StephaneLenclud@278:         /// <summary>
StephaneLenclud@278:         /// Decrement our visualizer counter.
StephaneLenclud@278:         /// </summary>
StephaneLenclud@278:         public void RemoveVisualizer()
StephaneLenclud@278:         {
StephaneLenclud@278:             if (iVisualizerCount == 1)
StephaneLenclud@278:             {
StephaneLenclud@278:                 // When reaching zero visualization is not need and we stop our engine
StephaneLenclud@278:                 StopAudioVisualization();
StephaneLenclud@278:                 iVisualizerCount = 0;
StephaneLenclud@278:             }
StephaneLenclud@278:             // Defensive: Make sure we don't go below zero
StephaneLenclud@278:             else if (iVisualizerCount>0)
StephaneLenclud@278:             {
StephaneLenclud@278:                 iVisualizerCount--;
StephaneLenclud@278:             }
StephaneLenclud@278:         }
StephaneLenclud@278: 
StephaneLenclud@278: 
StephaneLenclud@278:         /// <summary>
StephaneLenclud@277:         /// 
StephaneLenclud@277:         /// </summary>
StephaneLenclud@277:         /// <param name="aDefaultDeviceChangedHandler"></param>
StephaneLenclud@277:         /// <param name="aVolumeChangedHandler"></param>
StephaneLenclud@277:         public void Open(   EventHandler<DefaultDeviceChangedEventArgs> aDefaultDeviceChangedHandler,
StephaneLenclud@277:                             EventHandler<AudioEndpointVolumeCallbackEventArgs> aVolumeChangedHandler)
StephaneLenclud@277:         {
StephaneLenclud@277:             //Create device and register default device change notification
StephaneLenclud@277:             iMultiMediaDeviceEnumerator = new MMDeviceEnumerator();
StephaneLenclud@277:             iMultiMediaNotificationClient = new MMNotificationClient(iMultiMediaDeviceEnumerator);
StephaneLenclud@277:             iMultiMediaNotificationClient.DefaultDeviceChanged += iDefaultDeviceChangedHandler = aDefaultDeviceChangedHandler;
StephaneLenclud@277:             iMultiMediaDevice = iMultiMediaDeviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render,Role.Multimedia);
StephaneLenclud@277:             //Register to get volume modifications
StephaneLenclud@277:             iAudioEndpointVolume = AudioEndpointVolume.FromDevice(iMultiMediaDevice);
StephaneLenclud@277:             iAudioEndpointVolumeCallback = new AudioEndpointVolumeCallback();
StephaneLenclud@277:             iAudioEndpointVolumeCallback.NotifyRecived += iVolumeChangedHandler = aVolumeChangedHandler;
StephaneLenclud@277:             iAudioEndpointVolume.RegisterControlChangeNotify(iAudioEndpointVolumeCallback);
StephaneLenclud@277: 
StephaneLenclud@278:             if (iVisualizerCount > 0)
StephaneLenclud@278:             {
StephaneLenclud@278:                 // We probably got restarted, make sure visualization is running if needed
StephaneLenclud@278:                 StartAudioVisualization();
StephaneLenclud@278:             }
StephaneLenclud@277:         }
StephaneLenclud@277: 
StephaneLenclud@277:         /// <summary>
StephaneLenclud@277:         /// 
StephaneLenclud@277:         /// </summary>
StephaneLenclud@277:         public void Close()
StephaneLenclud@277:         {
StephaneLenclud@277:             StopAudioVisualization();
StephaneLenclud@277: 
StephaneLenclud@277:             // Client up our MM objects in reverse order
StephaneLenclud@277:             if (iAudioEndpointVolumeCallback != null && iAudioEndpointVolume != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iAudioEndpointVolume.UnregisterControlChangeNotify(iAudioEndpointVolumeCallback);
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@277:             if (iAudioEndpointVolumeCallback != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iAudioEndpointVolumeCallback.NotifyRecived -= iVolumeChangedHandler;
StephaneLenclud@277:                 iAudioEndpointVolumeCallback = null;
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@277:             if (iAudioEndpointVolume != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iAudioEndpointVolume.Dispose();
StephaneLenclud@277:                 iAudioEndpointVolume = null;
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@277:             if (iMultiMediaDevice != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iMultiMediaDevice.Dispose();
StephaneLenclud@277:                 iMultiMediaDevice = null;
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@277:             if (iMultiMediaNotificationClient != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iMultiMediaNotificationClient.DefaultDeviceChanged -= iDefaultDeviceChangedHandler;
StephaneLenclud@277:                 iMultiMediaNotificationClient.Dispose();
StephaneLenclud@277:                 iMultiMediaNotificationClient = null;
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@277:             if (iMultiMediaDeviceEnumerator != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iMultiMediaDeviceEnumerator.Dispose();
StephaneLenclud@277:                 iMultiMediaDeviceEnumerator = null;
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@277:         }
StephaneLenclud@277: 
StephaneLenclud@277: 
StephaneLenclud@277:         /// <summary>
StephaneLenclud@277:         /// 
StephaneLenclud@277:         /// </summary>
StephaneLenclud@277:         private void StartAudioVisualization()
StephaneLenclud@277:         {
StephaneLenclud@277:             //Open the default device 
StephaneLenclud@277:             iSoundIn = new WasapiLoopbackCapture();
StephaneLenclud@277:             //Our loopback capture opens the default render device by default so the following is not needed
StephaneLenclud@277:             //iSoundIn.Device = MMDeviceEnumerator.DefaultAudioEndpoint(DataFlow.Render, Role.Console);
StephaneLenclud@277:             iSoundIn.Initialize();
StephaneLenclud@277: 
StephaneLenclud@277:             SoundInSource soundInSource = new SoundInSource(iSoundIn);
StephaneLenclud@277:             ISampleSource source = soundInSource.ToSampleSource();
StephaneLenclud@277: 
StephaneLenclud@277:             const FftSize fftSize = FftSize.Fft2048;
StephaneLenclud@277:             //create a spectrum provider which provides fft data based on some input
StephaneLenclud@277:             BasicSpectrumProvider spectrumProvider = new BasicSpectrumProvider(source.WaveFormat.Channels, source.WaveFormat.SampleRate, fftSize);
StephaneLenclud@277: 
StephaneLenclud@277:             //linespectrum and voiceprint3dspectrum used for rendering some fft data
StephaneLenclud@277:             //in oder to get some fft data, set the previously created spectrumprovider 
StephaneLenclud@277:             iLineSpectrum = new LineSpectrum(fftSize)
StephaneLenclud@277:             {
StephaneLenclud@277:                 SpectrumProvider = spectrumProvider,
StephaneLenclud@278:                 UseAverage = false, // Does not matter since we hacked it
StephaneLenclud@277:                 BarCount = 16,
StephaneLenclud@277:                 BarSpacing = 1,
StephaneLenclud@278:                 IsXLogScale = true, // Does not matter since we hacked it
StephaneLenclud@278:                 ScalingStrategy = ScalingStrategy.Decibel // Does not matter since we hacked it
StephaneLenclud@277:             };
StephaneLenclud@277: 
StephaneLenclud@277: 
StephaneLenclud@277:             //the SingleBlockNotificationStream is used to intercept the played samples
StephaneLenclud@277:             var notificationSource = new SingleBlockNotificationStream(source);
StephaneLenclud@277:             //pass the intercepted samples as input data to the spectrumprovider (which will calculate a fft based on them)
StephaneLenclud@277:             notificationSource.SingleBlockRead += (s, a) => spectrumProvider.Add(a.Left, a.Right);
StephaneLenclud@277: 
StephaneLenclud@277:             iWaveSource = notificationSource.ToWaveSource(16);
StephaneLenclud@277: 
StephaneLenclud@277: 
StephaneLenclud@277:             // We need to read from our source otherwise SingleBlockRead is never called and our spectrum provider is not populated
StephaneLenclud@277:             byte[] buffer = new byte[iWaveSource.WaveFormat.BytesPerSecond / 2];
StephaneLenclud@277:             soundInSource.DataAvailable += (s, aEvent) =>
StephaneLenclud@277:             {
StephaneLenclud@277:                 int read;
StephaneLenclud@277:                 while ((read = iWaveSource.Read(buffer, 0, buffer.Length)) > 0) ;
StephaneLenclud@277:             };
StephaneLenclud@277: 
StephaneLenclud@277: 
StephaneLenclud@277:             //Start recording
StephaneLenclud@277:             iSoundIn.Start();
StephaneLenclud@277:         }
StephaneLenclud@277: 
StephaneLenclud@277:         /// <summary>
StephaneLenclud@277:         /// 
StephaneLenclud@277:         /// </summary>
StephaneLenclud@277:         private void StopAudioVisualization()
StephaneLenclud@277:         {
StephaneLenclud@278:             if (iSoundIn != null)
StephaneLenclud@278:             {
StephaneLenclud@278:                 iSoundIn.Stop();
StephaneLenclud@278:             }
StephaneLenclud@278: 
StephaneLenclud@278:                 if (iWaveSource != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iWaveSource.Dispose();
StephaneLenclud@277:                 iWaveSource = null;
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@277:             if (iSoundIn != null)
StephaneLenclud@277:             {
StephaneLenclud@277:                 iSoundIn.Dispose();
StephaneLenclud@277:                 iSoundIn = null;
StephaneLenclud@277:             }
StephaneLenclud@277: 
StephaneLenclud@278:             iLineSpectrum = null;
StephaneLenclud@277:         }
StephaneLenclud@277: 
StephaneLenclud@277: 
StephaneLenclud@277:     }
StephaneLenclud@277: }