WasapiLoopbackCapture.cs

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using System;
using System.Collections.Generic;
using System.Text;
using NAudio.Wave;
using System.Threading;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace NAudio.CoreAudioApi
{
    /// <summary>
    /// Audio Capture using Wasapi
    /// See http://msdn.microsoft.com/en-us/library/dd370800%28VS.85%29.aspx
    /// </summary>
    public class WasapiLoopbackCapture: IWaveIn
    {
        private const long REFTIMES_PER_SEC = 10000000;
        private const long REFTIMES_PER_MILLISEC = 10000;
        private volatile bool stop;
        private byte[] recordBuffer;
        private Thread captureThread;
        private AudioClient audioClient;
        private int bytesPerFrame;

        /// <summary>
        /// Indicates recorded data is available 
        /// </summary>
        public event EventHandler<WaveInEventArgs> DataAvailable;

        /// <summary>
        /// Indicates that all recorded data has now been received.
        /// </summary>
        public event EventHandler RecordingStopped;

        /// <summary>
        /// Initialises a new instance of the WASAPI capture class
        /// </summary>
        public WasapiLoopbackCapture () :
            this(GetDefaultCaptureDevice())
        {
        }

        /// <summary>
        /// Initialises a new instance of the WASAPI capture class
        /// </summary>
        /// <param name="captureDevice">Capture device to use</param>
        public WasapiLoopbackCapture(MMDevice captureDevice)
        {
            this.audioClient = captureDevice.AudioClient;
            WaveFormat = audioClient.MixFormat;
        }

        /// <summary>
        /// Recording wave format
        /// </summary>
        public WaveFormat WaveFormat { get; set; }

        /// <summary>
        /// Gets the default audio capture device
        /// </summary>