// 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.
//
// This material may not be duplicated in whole or in part, except for
// personal use, without the express written consent of the author.
//
// Email: ianier@hotmail.com
//
// Copyright (C) 1999-2003 Ianier Munoz. All Rights Reserved.
using System;
using System.Threading;
using System.Runtime.InteropServices;
namespace WaveLib
{
internal class WaveOutHelper
{
public static void Try(int err)
{
if (err != WaveNative.MMSYSERR_NOERROR)
throw new Exception(err.ToString());
}
}
public delegate void BufferFillEventHandler(IntPtr data, int size);
internal class WaveOutBuffer : IDisposable
{
public WaveOutBuffer NextBuffer;
private AutoResetEvent m_PlayEvent = new AutoResetEvent(false);
private IntPtr m_WaveOut;
private WaveNative.WaveHdr m_Header;
private byte[] m_HeaderData;
private GCHandle m_HeaderHandle;
private GCHandle m_HeaderDataHandle;
private bool m_Playing;
internal static void WaveOutProc(IntPtr hdrvr, int uMsg, int dwUser, ref WaveNative.WaveHdr wavhdr, int dwParam2)
{
if (uMsg == WaveNative.MM_WOM_DONE)
{
try
{
GCHandle h = (GCHandle)wavhdr.dwUser;
WaveOutBuffer buf = (WaveOutBuffer)h.Target;
buf.OnCompleted();
}
catch
{
}
}
}
public WaveOutBuffer(IntPtr waveOutHandle, int size)
{
m_WaveOut = waveOutHandle;
m_HeaderHandle = GCHandle.Alloc(m_Header, GCHandleType.Pinned);
m_Header.dwUser = (IntPtr)GCHandle.Alloc(this);
m_HeaderData = new byte[size];
m_HeaderDataHandle = GCHandle.Alloc(m_HeaderData, GCHandleType.Pinned);
m_Header.lpData = m_HeaderDataHandle.AddrOfPinnedObject();
m_Header.dwBufferLength = size;
WaveOutHelper.Try(WaveNative.waveOutPrepareHeader(m_WaveOut, ref m_Header, Marshal.SizeOf(m_Header)));
}
~WaveOutBuffer()
{
Dispose();
}
public void Dispose()
{
if (m_Header.lpData != IntPtr.Zero)
{
WaveNative.waveOutUnprepareHeader(m_WaveOut, ref m_Header, Marshal.SizeOf(m_Header));
m_HeaderHandle.Free();
m_Header.lpData = IntPtr.Zero;
}
m_PlayEvent.Close();
if (m_HeaderDataHandle.IsAllocated)
m_HeaderDataHandle.Free();
GC.SuppressFinalize(this);
}
public int Size
{
get { return m_Header.dwBufferLength; }
}
public IntPtr Data
{
get { return m_Header.lpData; }
}
public bool Play()
{
lock(this)
{
m_PlayEvent.Reset();
m_Playing = WaveNative.waveOutWrite(m_WaveOut, ref m_Header, Marshal.SizeOf(m_Header)) == WaveNative.MMSYSERR_NOERROR;
return m_Playing;
}
}
public void WaitFor()
{
if (m_Playing)
{
m_Playing = m_PlayEvent.WaitOne();
}
else
{
Thread.Sleep(0);
}
}
public void OnCompleted()
{
m_PlayEvent.Set();
m_Playing = false;
}
}
public class WaveOutPlayer : IDisposable
{
private IntPtr m_WaveOut;
private WaveOutBuffer m_Buffers; // linked list
private WaveOutBuffer m_CurrentBuffer;
private Thread m_Thread;
private BufferFillEventHandler m_FillProc;
private bool m_Finished;
private byte m_zero;
private WaveNative.WaveDelegate m_BufferProc = new WaveNative.WaveDelegate(WaveOutBuffer.WaveOutProc);
public static int DeviceCount
{
get { return WaveNative.waveOutGetNumDevs(); }
}
public WaveOutPlayer(int device, WaveFormat format, int bufferSize, int bufferCount, BufferFillEventHandler fillProc)
{
m_zero = format.wBitsPerSample == 8 ? (byte)128 : (byte)0;
m_FillProc = fillProc;
WaveOutHelper.Try(WaveNative.waveOutOpen(out m_WaveOut, device, format, m_BufferProc, 0, WaveNative.CALLBACK_FUNCTION));
AllocateBuffers(bufferSize, bufferCount);
m_Thread = new Thread(new ThreadStart(ThreadProc));
m_Thread.Start();
}
~WaveOutPlayer()
{
Dispose();
}
public void Dispose()
{
if (m_Thread != null)
try
{
m_Finished = true;
if (m_WaveOut != IntPtr.Zero)
WaveNative.waveOutReset(m_WaveOut);
m_Thread.Join();
m_FillProc = null;
FreeBuffers();
if (m_WaveOut != IntPtr.Zero)
WaveNative.waveOutClose(m_WaveOut);
}
finally
{
m_Thread = null;
m_WaveOut = IntPtr.Zero;
}
GC.SuppressFinalize(this);
}
private void ThreadProc()
{
while (!m_Finished)
{
Advance();
if (m_FillProc != null && !m_Finished)
m_FillProc(m_CurrentBuffer.Data, m_CurrentBuffer.Size);
else
{
// zero out buffer
byte v = m_zero;
byte[] b = new byte[m_CurrentBuffer.Size];
for (int i = 0; i < b.Length; i++)
b[i] = v;
Marshal.Copy(b, 0, m_CurrentBuffer.Data, b.Length);
}
m_CurrentBuffer.Play();
}
WaitForAllBuffers();
}
private void AllocateBuffers(int bufferSize, int bufferCount)
{
FreeBuffers();
if (bufferCount > 0)
{
m_Buffers = new WaveOutBuffer(m_WaveOut, bufferSize);
WaveOutBuffer Prev = m_Buffers;
try
{
for (int i = 1; i < bufferCount; i++)
{
WaveOutBuffer Buf = new WaveOutBuffer(m_WaveOut, bufferSize);
Prev.NextBuffer = Buf;
Prev = Buf;
}
}
finally
{
Prev.NextBuffer = m_Buffers;
}
}
}
private void FreeBuffers()
{
m_CurrentBuffer = null;
if (m_Buffers != null)
{
WaveOutBuffer First = m_Buffers;
m_Buffers = null;
WaveOutBuffer Current = First;
do
{
WaveOutBuffer Next = Current.NextBuffer;
Current.Dispose();
Current = Next;
} while(Current != First);
}
}
private void Advance()
{
m_CurrentBuffer = m_CurrentBuffer == null ? m_Buffers : m_CurrentBuffer.NextBuffer;
m_CurrentBuffer.WaitFor();
}
private void WaitForAllBuffers()
{
WaveOutBuffer Buf = m_Buffers;
while (Buf.NextBuffer != m_Buffers)
{
Buf.WaitFor();
Buf = Buf.NextBuffer;
}
}
}
}
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