code/WinAPI/WinMM.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.IO;

namespace Sylloge
{
    public static partial class WinAPI
    {
        public static class WinMM
        {
            #region WinMM

            #region Enums

            public enum WaveFormats
            {
                Pcm = 1,
                Float = 3
            }

            #endregion

            #region Structs

            [StructLayout(LayoutKind.Sequential)]
            public struct WaveHdr
            {
                public IntPtr lpData; // pointer to locked data buffer
                public int dwBufferLength; // length of data buffer
                public int dwBytesRecorded; // used for input only
                public IntPtr dwUser; // for client's use
                public int dwFlags; // assorted flags (see defines)
                public int dwLoops; // loop control counter
                public IntPtr lpNext; // PWaveHdr, reserved for driver
                public int reserved; // reserved for driver
            }

            [StructLayout(LayoutKind.Sequential)]
            public class WaveFormat
            {
                public short wFormatTag;
                public short nChannels;
                public int nSamplesPerSec;
                public int nAvgBytesPerSec;
                public short nBlockAlign;
                public short wBitsPerSample;
                public short cbSize;

                public WaveFormat(int rate, int bits, int channels)
                {
                    wFormatTag = (short)WaveFormats.Pcm;
                    nChannels = (short)channels;
                    nSamplesPerSec = rate;
                    wBitsPerSample = (short)bits;
                    cbSize = 0;

                    nBlockAlign = (short)(channels * (bits / 8));
                    nAvgBytesPerSec = nSamplesPerSec * nBlockAlign;
                }
            }

            #endregion

            public const int MMSYSERR_NOERROR = 0; // no error

            public const int MM_WOM_OPEN = 0x3BB;
            public const int MM_WOM_CLOSE = 0x3BC;
            public const int MM_WOM_DONE = 0x3BD;

            public const int CALLBACK_FUNCTION = 0x00030000;    // dwCallback is a FARPROC 

            public const int TIME_MS = 0x0001;  // time in milliseconds 
            public const int TIME_SAMPLES = 0x0002;  // number of wave samples 
            public const int TIME_BYTES = 0x0004;  // current byte offset 

            // use the userdata as a reference
            // WaveOutProc http://msdn.microsoft.com/en-us/library/dd743869%28VS.85%29.aspx
            // WaveInProc http://msdn.microsoft.com/en-us/library/dd743849%28VS.85%29.aspx
            public delegate void WaveDelegate(IntPtr hdrvr, int uMsg, int dwUser, ref WaveHdr wavhdr, int dwParam2);

            [DllImport("winmm.dll")]
            public static extern int waveOutGetNumDevs();
            [DllImport("winmm.dll")]
            public static extern int waveOutOpen(out IntPtr hWaveOut, int uDeviceID, WaveFormat lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
            [DllImport("winmm.dll")]
            public static extern int waveOutGetVolume(IntPtr hWaveOut, out uint dwVolume);
            [DllImport("winmm.dll")]
            public static extern int waveOutSetVolume(IntPtr hWaveOut, uint dwVolume);
            [DllImport("winmm.dll")]
            public static extern int waveOutReset(IntPtr hWaveOut);
            [DllImport("winmm.dll")]
            public static extern int waveOutClose(IntPtr hWaveOut);
            [DllImport("winmm.dll")]
            public static extern int waveOutPause(IntPtr hWaveOut);
            [DllImport("winmm.dll")]
            public static extern int waveOutRestart(IntPtr hWaveOut);
            [DllImport("winmm.dll")]
            public static extern int waveOutGetPosition(IntPtr hWaveOut, out int lpInfo, int uSize);
            [DllImport("winmm.dll")]
            public static extern int waveOutPrepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
            [DllImport("winmm.dll")]
            public static extern int waveOutUnprepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
            [DllImport("winmm.dll")]
            public static extern int waveOutWrite(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
            
            #endregion
        }
    }
}