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Audio Library Part I - (Windows Mixer Control)

, 1 Oct 2006 CPOL
Library to control Windows Mixer from C#
//
//  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
//  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
//  PURPOSE. IT CAN BE DISTRIBUTED FREE OF CHARGE AS LONG AS THIS HEADER 
//  REMAINS UNCHANGED.
//
//  Email:  gustavo_franco@hotmail.com
//
//  Copyright (C) 2005 Franco, Gustavo 
//
using System;
using System.Runtime.InteropServices;

namespace WaveLib.AudioMixer
{
	#region Aliases
	using HMIXER	= System.IntPtr;
	using HWAVEIN	= System.IntPtr;
	using HWAVEOUT	= System.IntPtr;
	#endregion

	#region Enums
	internal enum FuncName
	{
		fnWaveInOpen,
		fnWaveInClose,
		fnWaveInGetDevCaps,
		fnWaveOutOpen,
		fnWaveOutClose,
		fnWaveOutGetDevCaps,
		fnMixerOpen,
		fnMixerGetID,
		fnMixerClose,
		fnMixerGetLineInfo,
		fnMixerGetLineControls,
		fnMixerGetControlDetails,
		fnMixerSetControlDetails,
		fnMixerGetDevCaps,


		fnCustom
	};
	#endregion

	[Author("Gustavo Franco")]
	public class Mixers
	{
		#region Constants Declaration
		#endregion

		#region Variables Declaration 
		private Mixer	mRecording;
		private Mixer	mPlayback;
		#endregion

		#region Constructors
		public Mixers() : this(false)
		{
		}

		public Mixers(bool ignoreExceptions)
		{
            if (ignoreExceptions)
            {
                try
                {
                    mRecording = new Mixer(MixerType.Recording);
                }
                catch (Exception)
                {
                    mRecording = null;
                }
            }
            else
                mRecording = new Mixer(MixerType.Recording);

            if (ignoreExceptions)
            {
                try
                {
			        mPlayback = new Mixer(MixerType.Playback);
                }
                catch (Exception)
                {
                    mPlayback = null;
                }
            }
            else
		        mPlayback	= new Mixer(MixerType.Playback);
		}
		#endregion

		#region Properties
		#region Recording
		public Mixer Recording
		{
			get{return mRecording;}
		}
		#endregion

		#region Playback
		public Mixer Playback
		{
			get{return mPlayback;}
		}
		#endregion

		#region Devices
		public unsafe MixerDetails Devices
		{
			get
			{
				MMErrors		errorCode	= 0;
				MixerDetails	mixDetails	= new MixerDetails();
				HMIXER			hMixer		= IntPtr.Zero;  

				try
				{
					MIXERCAPS	wic = new MIXERCAPS();
					
					int iNumDevs = MixerNative.mixerGetNumDevs();

					for (int i=0; i<iNumDevs; i++)
					{
						// Get info about the next device 
						errorCode = (MMErrors) MixerNative.mixerGetDevCaps(i, ref wic, Marshal.SizeOf(wic));
						if (errorCode != MMErrors.MMSYSERR_NOERROR)
							throw new MixerException(errorCode, GetErrorDescription(FuncName.fnMixerGetDevCaps, errorCode));

						errorCode = (MMErrors) MixerNative.mixerOpen(out hMixer, i, IntPtr.Zero, IntPtr.Zero, 0);
						if (errorCode != MMErrors.MMSYSERR_NOERROR)
							throw new MixerException(errorCode, GetErrorDescription(FuncName.fnMixerOpen, errorCode));

						MixerDetail mixDetail	= new MixerDetail();
						MIXERLINE	mxl			= new MIXERLINE();
						
						mxl.cbStruct = (uint) Marshal.SizeOf(mxl);
						mxl.dwComponentType = MIXERLINE_COMPONENTTYPE.DST_WAVEIN;
						if (MixerNative.mixerGetLineInfo(hMixer, ref mxl, MIXER_GETLINEINFOF.COMPONENTTYPE) == 0)
						{
							mixDetail.DeviceId		= i;
							mixDetail.MixerName		= wic.szPname;
							mixDetail.SupportWaveIn = true;
						}

						mxl.dwComponentType = MIXERLINE_COMPONENTTYPE.DST_SPEAKERS;
						if (MixerNative.mixerGetLineInfo(hMixer, ref mxl, MIXER_GETLINEINFOF.COMPONENTTYPE) == 0)
						{
							mixDetail.DeviceId		= i;
							mixDetail.MixerName		= wic.szPname;
							mixDetail.SupportWaveOut= true;
						}

						if (mixDetail.SupportWaveIn == true || mixDetail.SupportWaveOut == true )
							mixDetails.Add(mixDetail);
					}
				}
				finally
				{
					if (hMixer != IntPtr.Zero)
						MixerNative.mixerClose(hMixer);
				}

				return mixDetails;
			}
		}
		#endregion
		#endregion

		#region Methods
		#endregion	

		#region GetErrorDescription
		internal static string GetErrorDescription(FuncName funcName, MMErrors errorCode)
		{
			string errorDesc = "";

			switch(funcName)
			{
				case FuncName.fnWaveOutOpen:
				case FuncName.fnWaveInOpen:
				switch(errorCode)
				{
					case MMErrors.MMSYSERR_ALLOCATED:
						errorDesc = "Specified resource is already allocated.";
						break;
					case MMErrors.MMSYSERR_BADDEVICEID:
						errorDesc = "Specified device identifier is out of range.";
						break;
					case MMErrors.MMSYSERR_NODRIVER:
						errorDesc = "No device driver is present.";
						break;
					case MMErrors.MMSYSERR_NOMEM:
						errorDesc = "Unable to allocate or lock memory.";
						break;
					case MMErrors.WAVERR_BADFORMAT:
						errorDesc = "Attempted to open with an unsupported waveform-audio format.";
						break;
					case MMErrors.WAVERR_SYNC:
						errorDesc = "The device is synchronous but waveOutOpen was called without using the WAVE_ALLOWSYNC flag.";
						break;
				}
					break;
				case FuncName.fnMixerOpen:
				switch(errorCode)
				{
					case MMErrors.MMSYSERR_ALLOCATED:
						errorDesc = "The specified resource is already allocated by the maximum number of clients possible.";
						break;
					case MMErrors.MMSYSERR_BADDEVICEID:
						errorDesc = "The uMxId parameter specifies an invalid device identifier.";
						break;
					case MMErrors.MMSYSERR_INVALFLAG:
						errorDesc = "One or more flags are invalid.";
						break;
					case MMErrors.MMSYSERR_INVALHANDLE:
						errorDesc = "The uMxId parameter specifies an invalid handle.";
						break;
					case MMErrors.MMSYSERR_INVALPARAM:
						errorDesc = "One or more parameters are invalid.";
						break;
					case MMErrors.MMSYSERR_NODRIVER:
						errorDesc = "No device driver is present.";
						break;
					case MMErrors.MMSYSERR_NOMEM:
						errorDesc = "Unable to allocate or lock memory.";
						break;
				}
					break;
				case FuncName.fnMixerGetID:
				case FuncName.fnMixerGetLineInfo:
				case FuncName.fnMixerGetLineControls:
				case FuncName.fnMixerGetControlDetails:
				case FuncName.fnMixerSetControlDetails:
				switch(errorCode)
				{
					case MMErrors.MIXERR_INVALCONTROL:
						errorDesc = "The control reference is invalid.";
						break;
					case MMErrors.MIXERR_INVALLINE:
						errorDesc = "The audio line reference is invalid.";
						break;
					case MMErrors.MMSYSERR_BADDEVICEID:
						errorDesc = "The hmxobj parameter specifies an invalid device identifier.";
						break;
					case MMErrors.MMSYSERR_INVALFLAG:
						errorDesc = "One or more flags are invalid.";
						break;
					case MMErrors.MMSYSERR_INVALHANDLE:
						errorDesc = "The hmxobj parameter specifies an invalid handle.";
						break;
					case MMErrors.MMSYSERR_INVALPARAM:
						errorDesc = "One or more parameters are invalid.";
						break;
					case MMErrors.MMSYSERR_NODRIVER:
						errorDesc = "No device driver is present.";
						break;
				}
					break;
				case FuncName.fnMixerClose:
				switch(errorCode)
				{
					case MMErrors.MMSYSERR_INVALHANDLE:
						errorDesc = "Specified device handle is invalid.";
						break;
				}
					break;
				case FuncName.fnWaveOutClose:
				case FuncName.fnWaveInClose:
				case FuncName.fnWaveInGetDevCaps:
				case FuncName.fnWaveOutGetDevCaps:
				case FuncName.fnMixerGetDevCaps:
				switch(errorCode)
				{
					case MMErrors.MMSYSERR_BADDEVICEID:
						errorDesc = "Specified device identifier is out of range.";
						break;
					case MMErrors.MMSYSERR_INVALHANDLE:
						errorDesc = "Specified device handle is invalid.";
						break;
					case MMErrors.MMSYSERR_NODRIVER:
						errorDesc = "No device driver is present.";
						break;
					case MMErrors.MMSYSERR_NOMEM:
						errorDesc = "Unable to allocate or lock memory.";
						break;
					case MMErrors.WAVERR_STILLPLAYING:
						errorDesc = "There are still buffers in the queue.";
						break;
				}
					break;
				case FuncName.fnCustom:
				switch(errorCode)
				{
					case (MMErrors) 1000:
						errorDesc = "Device Not Found.";
						break;
				}
					break;
			}
			return errorDesc;
		}
		#endregion
	}
}

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About the Author

CastorTiu
Software Developer Microsoft
United States United States
I started with programming about 19 years ago as a teenager, from my old Commodore moving to PC/Server environment Windows/UNIX SQLServer/Oracle doing gwBasic, QBasic, Turbo Pascal, Assembler, Turbo C, BC, Summer87, Clipper, Fox, SQL, C/C++, Pro*C, VB3/5/6, Java, and today loving C#.

Currently working as SDE on Failover Clustering team for Microsoft.

Passion for most programming languages and my kids Aidan&Nadia.

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