sound/recorder/WaveNative.cs

   1 //  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
   2 //  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
   3 //  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
   4 //  PURPOSE.
   5 //
   6 //  Email:  ianier@hotmail.com
   7 //
   8 //  Copyright (C) 1999-2003 Ianier Munoz. All Rights Reserved.
   9
  10 using System;
  11 using System.Runtime.InteropServices;
  12
  13 namespace WaveLib
  14 {
  15         public enum WaveFormats
  16         {
  17                 Pcm = 1,
  18                 Float = 3
  19         }
  20
  21         [StructLayout(LayoutKind.Sequential)]
  22         public class WaveFormat
  23         {
  24                 public short wFormatTag;
  25                 public short nChannels;
  26                 public int nSamplesPerSec;
  27                 public int nAvgBytesPerSec;
  28                 public short nBlockAlign;
  29                 public short wBitsPerSample;
  30                 public short cbSize;
  31
  32                 public WaveFormat(int rate, int bits, int channels)
  33                 {
  34                         wFormatTag = (short)WaveFormats.Pcm;
  35                         nChannels = (short)channels;
  36                         nSamplesPerSec = rate;
  37                         wBitsPerSample = (short)bits;
  38                         cbSize = 0;
  39
  40                         nBlockAlign = (short)(channels * (bits / 8));
  41                         nAvgBytesPerSec = nSamplesPerSec * nBlockAlign;
  42                 }
  43         }
  44
  45         internal class WaveNative
  46         {
  47                 // consts
  48                 public const int MMSYSERR_NOERROR = 0; // no error
  49
  50                 public const int MM_WOM_OPEN = 0x3BB;
  51                 public const int MM_WOM_CLOSE = 0x3BC;
  52                 public const int MM_WOM_DONE = 0x3BD;
  53
  54                 public const int MM_WIM_OPEN = 0x3BE;
  55                 public const int MM_WIM_CLOSE = 0x3BF;
  56                 public const int MM_WIM_DATA = 0x3C0;
  57
  58                 public const int CALLBACK_FUNCTION = 0x00030000;    // dwCallback is a FARPROC
  59
  60                 public const int TIME_MS = 0x0001;  // time in milliseconds
  61                 public const int TIME_SAMPLES = 0x0002;  // number of wave samples
  62                 public const int TIME_BYTES = 0x0004;  // current byte offset
  63
  64                 // callbacks
  65                 public delegate void WaveDelegate(IntPtr hdrvr, int uMsg, int dwUser, ref WaveHdr wavhdr, int dwParam2);
  66
  67                 // structs
  68
  69                 [StructLayout(LayoutKind.Sequential)] public struct WaveHdr
  70                 {
  71                         public IntPtr lpData; // pointer to locked data buffer
  72                         public int dwBufferLength; // length of data buffer
  73                         public int dwBytesRecorded; // used for input only
  74                         public IntPtr dwUser; // for client's use
  75                         public int dwFlags; // assorted flags (see defines)
  76                         public int dwLoops; // loop control counter
  77                         public IntPtr lpNext; // PWaveHdr, reserved for driver
  78                         public int reserved; // reserved for driver
  79                 }
  80
  81                 private const string mmdll = "winmm.dll";
  82
  83                 // WaveOut calls
  84                 [DllImport(mmdll)]
  85                 public static extern int waveOutGetNumDevs();
  86                 [DllImport(mmdll)]
  87                 public static extern int waveOutPrepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
  88                 [DllImport(mmdll)]
  89                 public static extern int waveOutUnprepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
  90                 [DllImport(mmdll)]
  91                 public static extern int waveOutWrite(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
  92                 [DllImport(mmdll)]
  93                 public static extern int waveOutOpen(out IntPtr hWaveOut, int uDeviceID, WaveFormat lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
  94                 [DllImport(mmdll)]
  95                 public static extern int waveOutReset(IntPtr hWaveOut);
  96                 [DllImport(mmdll)]
  97                 public static extern int waveOutClose(IntPtr hWaveOut);
  98                 [DllImport(mmdll)]
  99                 public static extern int waveOutPause(IntPtr hWaveOut);
 100                 [DllImport(mmdll)]
 101                 public static extern int waveOutRestart(IntPtr hWaveOut);
 102                 [DllImport(mmdll)]
 103                 public static extern int waveOutGetPosition(IntPtr hWaveOut, out int lpInfo, int uSize);
 104                 [DllImport(mmdll)]
 105                 public static extern int waveOutSetVolume(IntPtr hWaveOut, int dwVolume);
 106                 [DllImport(mmdll)]
 107                 public static extern int waveOutGetVolume(IntPtr hWaveOut, out int dwVolume);
 108
 109                 // WaveIn calls
 110                 [DllImport(mmdll)]
 111                 public static extern int waveInGetNumDevs();
 112                 [DllImport(mmdll)]
 113                 public static extern int waveInAddBuffer(IntPtr hwi, ref WaveHdr pwh, int cbwh);
 114                 [DllImport(mmdll)]
 115                 public static extern int waveInClose(IntPtr hwi);
 116                 [DllImport(mmdll)]
 117                 public static extern int waveInOpen(out IntPtr phwi, int uDeviceID, WaveFormat lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
 118                 [DllImport(mmdll)]
 119                 public static extern int waveInPrepareHeader(IntPtr hWaveIn, ref WaveHdr lpWaveInHdr, int uSize);
 120                 [DllImport(mmdll)]
 121                 public static extern int waveInUnprepareHeader(IntPtr hWaveIn, ref WaveHdr lpWaveInHdr, int uSize);
 122                 [DllImport(mmdll)]
 123                 public static extern int waveInReset(IntPtr hwi);
 124                 [DllImport(mmdll)]
 125                 public static extern int waveInStart(IntPtr hwi);
 126                 [DllImport(mmdll)]
 127                 public static extern int waveInStop(IntPtr hwi);
 128         }
 129 }