/NAudio/Wave/WaveInputs/WasapiLoopbackCapture.cs

using System;

using System.Collections.Generic;

using System.Text;

using NAudio.CoreAudioApi;



namespace NAudio.Wave

{

    /// <summary>

    /// WASAPI Loopback Capture

    /// based on a contribution from "Pygmy" - http://naudio.codeplex.com/discussions/203605

    /// </summary>

    public class WasapiLoopbackCapture : WasapiCapture

    {

        /// <summary>

        /// Initialises a new instance of the WASAPI capture class

        /// </summary>

        public WasapiLoopbackCapture() :

            this(GetDefaultLoopbackCaptureDevice())

        {

        }



        /// <summary>

        /// Initialises a new instance of the WASAPI capture class

        /// </summary>

        /// <param name="captureDevice">Capture device to use</param>

        public WasapiLoopbackCapture(MMDevice captureDevice) :

            base(captureDevice)

        {

        }



        /// <summary>

        /// Gets the default audio loopback capture device

        /// </summary>

        /// <returns>The default audio loopback capture device</returns>

        public static MMDevice GetDefaultLoopbackCaptureDevice()

        {

            MMDeviceEnumerator devices = new MMDeviceEnumerator();

            return devices.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);

        }



        /// <summary>

        /// Recording wave format

        /// </summary>

        public override WaveFormat WaveFormat

        {

            get { return base.WaveFormat; }

            set { throw new InvalidOperationException("WaveFormat cannot be set for WASAPI Loopback Capture"); }

        }

        

        /// <summary>

        /// Specify loopback

        /// </summary>

        protected override AudioClientStreamFlags GetAudioClientStreamFlags()

        {

            return AudioClientStreamFlags.Loopback;

        }        

    }

}