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

namespace LumiSoft.Media.Wave.Native
{
    /// <summary>
    /// The waveOutProc function is the callback function used with the waveform-audio output device.
    /// </summary>
    /// <param name="hdrvr">Handle to the waveform-audio device associated with the callback.</param>
    /// <param name="uMsg">Waveform-audio output message.</param>
    /// <param name="dwUser">User-instance data specified with waveOutOpen.</param>
    /// <param name="dwParam1">Message parameter.</param>
    /// <param name="dwParam2">Message parameter.</param>
    internal delegate void waveOutProc(IntPtr hdrvr,int uMsg,int dwUser,int dwParam1,int dwParam2);

    /// <summary>
    /// The waveInProc function is the callback function used with the waveform-audio input device.
    /// </summary>
    /// <param name="hdrvr">Handle to the waveform-audio device associated with the callback.</param>
    /// <param name="uMsg">Waveform-audio input message.</param>
    /// <param name="dwUser">User-instance data specified with waveOutOpen.</param>
    /// <param name="dwParam1">Message parameter.</param>
    /// <param name="dwParam2">Message parameter.</param>
    internal delegate void waveInProc(IntPtr hdrvr,int uMsg,int dwUser,int dwParam1,int dwParam2);

    /// <summary>
    /// This class provides windows wav methods.
    /// </summary>
    internal class WavMethods
    {
        /// <summary>
        /// The waveInAddBuffer function sends an input buffer to the given waveform-audio input device. When the buffer is filled, the application is notified.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio input device.</param>
        /// <param name="lpWaveOutHdr">Pointer to a WAVEHDR structure that identifies the buffer.</param>
        /// <param name="uSize">Size, in bytes, of the WAVEHDR structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveInAddBuffer(IntPtr hWaveOut,IntPtr lpWaveOutHdr,int uSize);

        /// <summary>
        /// Closes the specified waveform input device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio input device. If the function succeeds, the handle is no longer valid after this call.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveInClose(IntPtr hWaveOut);

        /// <summary>
        /// Queries a specified waveform device to determine its capabilities.
        /// </summary>
        /// <param name="hwo">Identifier of the waveform-audio input device. It can be either a device identifier or a Handle to an open waveform-audio output device.</param>
        /// <param name="pwoc">Pointer to a WAVEOUTCAPS structure to be filled with information about the capabilities of the device.</param>
        /// <param name="cbwoc">Size, in bytes, of the WAVEOUTCAPS structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
        public static extern uint waveInGetDevCaps(uint hwo,ref WAVEOUTCAPS pwoc,int cbwoc);

        /// <summary>
        /// Get the waveInGetNumDevs function returns the number of waveform-audio input devices present in the system.
        /// </summary>
        /// <returns>Returns the waveInGetNumDevs function returns the number of waveform-audio input devices present in the system.
        /// </returns>
        [DllImport("winmm.dll")]
        public static extern int waveInGetNumDevs();

        /// <summary>
        /// The waveInOpen function opens the given waveform-audio input device for recording.
        /// </summary>
        /// <param name="hWaveOut">Pointer to a buffer that receives a handle identifying the open waveform-audio input device.</param>
        /// <param name="uDeviceID">Identifier of the waveform-audio input device to open. It can be either a device identifier or a handle of an open waveform-audio input device. You can use the following flag instead of a device identifier.</param>
        /// <param name="lpFormat">Pointer to a WAVEFORMATEX structure that identifies the desired format for recording waveform-audio data. You can free this structure immediately after waveInOpen returns.</param>
        /// <param name="dwCallback">Pointer to a fixed callback function, an event handle, a handle to a window, 
        /// or the identifier of a thread to be called during waveform-audio recording to process messages related 
        /// to the progress of recording. If no callback function is required, this value can be zero. 
        /// For more information on the callback function, see waveInProc.</param>
        /// <param name="dwInstance">User-instance data passed to the callback mechanism.</param>
        /// <param name="dwFlags">Flags for opening the device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveInOpen(out IntPtr hWaveOut,int uDeviceID,WAVEFORMATEX lpFormat,waveInProc dwCallback,int dwInstance,int dwFlags);

        /// <summary>
        /// Prepares a waveform data block for recording.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio input device.</param>
        /// <param name="lpWaveOutHdr">Pointer to a WAVEHDR structure that identifies the data block to be prepared. 
        /// The buffer's base address must be aligned with the respect to the sample size.</param>
        /// <param name="uSize">Size, in bytes, of the WAVEHDR structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveInPrepareHeader(IntPtr hWaveOut,IntPtr lpWaveOutHdr,int uSize);

        /// <summary>
        /// Stops input on a specified waveform output device and resets the current position to 0.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio input device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveInReset(IntPtr hWaveOut);

        /// <summary>
        /// Starts input on the given waveform-audio input device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio input device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveInStart(IntPtr hWaveOut);

        /// <summary>
        /// Stops input on the given waveform-audio input device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio input device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveInStop(IntPtr hWaveOut);

        /// <summary>
        /// Cleans up the preparation performed by waveInPrepareHeader.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio input device.</param>
        /// <param name="lpWaveOutHdr">Pointer to a WAVEHDR structure identifying the data block to be cleaned up.</param>
        /// <param name="uSize">Size, in bytes, of the WAVEHDR structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveInUnprepareHeader(IntPtr hWaveOut,IntPtr lpWaveOutHdr,int uSize);

        /// <summary>
        /// Closes the specified waveform output device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device. If the function succeeds, the handle is no longer valid after this call.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutClose(IntPtr hWaveOut);
                
        /// <summary>
        /// Queries a specified waveform device to determine its capabilities.
        /// </summary>
        /// <param name="hwo">Identifier of the waveform-audio output device. It can be either a device identifier or a Handle to an open waveform-audio output device.</param>
        /// <param name="pwoc">Pointer to a WAVEOUTCAPS structure to be filled with information about the capabilities of the device.</param>
        /// <param name="cbwoc">Size, in bytes, of the WAVEOUTCAPS structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
        public static extern uint waveOutGetDevCaps(uint hwo,ref WAVEOUTCAPS pwoc,int cbwoc);

        /// <summary>
        /// Retrieves the number of waveform output devices present in the system.
        /// </summary>
        /// <returns>The number of devices indicates success. Zero indicates that no devices are present or that an error occurred.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutGetNumDevs();
        
        /// <summary>
        /// Retrieves the current playback position of the specified waveform output device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device.</param>
        /// <param name="lpInfo">Pointer to an MMTIME structure.</param>
        /// <param name="uSize">Size, in bytes, of the MMTIME structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutGetPosition(IntPtr hWaveOut,out int lpInfo,int uSize);

        /// <summary>
        /// Queries the current volume setting of a waveform output device.
        /// </summary>
        /// <param name="hWaveOut">Handle to an open waveform-audio output device. This parameter can also be a device identifier.</param>
        /// <param name="dwVolume">Pointer to a variable to be filled with the current volume setting. 
        /// The low-order word of this location contains the left-channel volume setting, and the high-order 
        /// word contains the right-channel setting. A value of 0xFFFF represents full volume, and a 
        /// value of 0x0000 is silence.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutGetVolume(IntPtr hWaveOut,out int dwVolume);

        /// <summary>
        /// The waveOutOpen function opens the given waveform-audio output device for playback.
        /// </summary>
        /// <param name="hWaveOut">Pointer to a buffer that receives a handle identifying the open waveform-audio output device. Use the handle to identify the device when calling other waveform-audio output functions. This parameter might be NULL if the WAVE_FORMAT_QUERY flag is specified for fdwOpen.</param>
        /// <param name="uDeviceID">Identifier of the waveform-audio output device to open. It can be either a device identifier or a handle of an open waveform-audio input device.</param>
        /// <param name="lpFormat">Pointer to a WAVEFORMATEX structure that identifies the format of the waveform-audio data to be sent to the device. You can free this structure immediately after passing it to waveOutOpen.</param>
        /// <param name="dwCallback">Pointer to a fixed callback function, an event handle, a handle to a window, or the identifier of a thread to be called during waveform-audio playback to process messages related to the progress of the playback. If no callback function is required, this value can be zero.</param>
        /// <param name="dwInstance">User-instance data passed to the callback mechanism.</param>
        /// <param name="dwFlags">Flags for opening the device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveOutOpen(out IntPtr hWaveOut,int uDeviceID,WAVEFORMATEX lpFormat,waveOutProc dwCallback,int dwInstance,int dwFlags);
        
        /// <summary>
        /// Pauses playback on a specified waveform output device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutPause(IntPtr hWaveOut);

        /// <summary>
        /// Prepares a waveform data block for playback.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device.</param>
        /// <param name="lpWaveOutHdr">Pointer to a WAVEHDR structure that identifies the data block to be prepared. The buffer's base address must be aligned with the respect to the sample size.</param>
        /// <param name="uSize">Size, in bytes, of the WAVEHDR structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveOutPrepareHeader(IntPtr hWaveOut,IntPtr lpWaveOutHdr,int uSize);

        /// <summary>
        /// Stops playback on a specified waveform output device and resets the current position to 0.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutReset(IntPtr hWaveOut);

        /// <summary>
        /// Restarts a paused waveform output device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutRestart(IntPtr hWaveOut);

        /// <summary>
        /// Sets the volume of a waveform output device.
        /// </summary>
        /// <param name="hWaveOut">Handle to an open waveform-audio output device. This parameter can also be a device identifier.</param>
        /// <param name="dwVolume">Specifies a new volume setting. The low-order word contains the left-channel 
        /// volume setting, and the high-order word contains the right-channel setting. A value of 0xFFFF 
        /// represents full volume, and a value of 0x0000 is silence.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
        [DllImport("winmm.dll")]
		public static extern int waveOutSetVolume(IntPtr hWaveOut,int dwVolume);

        /// <summary>
        /// Cleans up the preparation performed by waveOutPrepareHeader.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device.</param>
        /// <param name="lpWaveOutHdr">Pointer to a WAVEHDR structure identifying the data block to be cleaned up.</param>
        /// <param name="uSize">Size, in bytes, of the WAVEHDR structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveOutUnprepareHeader(IntPtr hWaveOut,IntPtr lpWaveOutHdr,int uSize);

        /// <summary>
        /// Sends a data block to the specified waveform output device.
        /// </summary>
        /// <param name="hWaveOut">Handle to the waveform-audio output device.</param>
        /// <param name="lpWaveOutHdr">Pointer to a WAVEHDR structure containing information about the data block.</param>
        /// <param name="uSize">Size, in bytes, of the WAVEHDR structure.</param>
        /// <returns>Returns value of MMSYSERR.</returns>
		[DllImport("winmm.dll")]
		public static extern int waveOutWrite(IntPtr hWaveOut,IntPtr lpWaveOutHdr,int uSize);
        
    }
}