/// <summary>
/// Stops capturing audio data.
/// </summary>
public void StopCapture()
{
if (this.wasapiCapture != null)
{
this.wasapiCapture.Dispose();
this.wasapiCapture = null;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="AudioCapture"/> class.
/// </summary>
/// <param name="pipeline">The pipeline to add the component to.</param>
/// <param name="configuration">The component configuration.</param>
public AudioCapture(Pipeline pipeline, AudioCaptureConfiguration configuration)
{
this.pipeline = pipeline;
this.configuration = configuration;
this.audioBuffers = pipeline.CreateEmitter <AudioBuffer>(this, "AudioBuffers");
this.AudioLevelInput = pipeline.CreateReceiver <double>(this, this.SetAudioLevel, nameof(this.AudioLevelInput), true);
this.AudioLevel = pipeline.CreateEmitter <double>(this, nameof(this.AudioLevel));
this.wasapiCapture = new WasapiCapture();
this.wasapiCapture.Initialize(this.Configuration.DeviceName);
if (this.Configuration.AudioLevel >= 0)
{
this.wasapiCapture.AudioLevel = this.Configuration.AudioLevel;
}
}
/// <summary>
/// Starts capturing audio data.
/// </summary>
/// <param name="targetLatencyInMs">
/// The target maximum number of milliseconds of acceptable lag between
/// live sound being produced and capture operation.
/// </param>
/// <param name="gain">
/// The gain to be applied to the captured audio.
/// </param>
/// <param name="outFormat">
/// The desired output format of the captured audio.
/// </param>
/// <param name="speech">
/// If true, optimizes the audio capture pipeline for speech recognition.
/// </param>
public void StartCapture(int targetLatencyInMs, float gain, WaveFormat outFormat, bool speech)
{
if (this.wasapiCapture != null)
{
this.StopCapture();
}
this.wasapiCapture = new WasapiCapture(this.audioDevice);
// Create a callback delegate and marshal it to a function pointer. Keep a
// reference to the delegate as a class field to prevent it from being GC'd.
this.callbackDelegate = new AudioDataAvailableCallback(this.AudioDataAvailableCallback);
// initialize the capture with the desired parameters
this.wasapiCapture.Initialize(targetLatencyInMs, gain, outFormat, this.callbackDelegate, speech);
// tell WASAPI to start capturing
this.wasapiCapture.Start();
}
/// <summary>
/// Static method to get the available audio capture devices.
/// </summary>
/// <returns>
/// An array of available capture device names.
/// </returns>
public static string[] GetAvailableDevices()
{
return(WasapiCapture.GetAvailableCaptureDevices());
}
