public static RiffStream OpenRead(Stream underlyingStream)
{
RiffStream stm = new RiffStream();
stm._accessMode = FileAccess.Read;
stm._baseStream = underlyingStream;
stm.LoadHeader();
if (stm.Format.FormatTag != FormatTag.PCM) // need conversion
{
stm.Detach();
underlyingStream.Seek(0, SeekOrigin.Begin);
stm = ACMStream.OpenRead(underlyingStream);
}
return(stm);
}
/// <summary>
/// Plays waveform contained in the given stream. Stream is exepcted to contain full riff header
/// </summary>
/// <param name="playStream">Stream with the waveform</param>
public void Play(Stream playStream)
{
Monitor.Enter(m_syncRoot);
try
{
if (m_playing)
{
return;
}
if (playStream == null)
{
throw new Exception("No valid WAV file has been opened");
}
#if !NDOC
if (m_qBuffers == null)
{
m_qBuffers = new Queue <WaveHeader>(MaxBuffers);
}
if (m_HandleMap == null)
{
m_HandleMap = new System.Collections.Hashtable(MaxBuffers);
}
// create a window to catch waveOutxxx messages
SoundMessageWindow mw = new SoundMessageWindow();
// wire in events
mw.WaveOpenMessage += new WaveOpenHandler(mw_WaveOpenMessage);
mw.WaveCloseMessage += new WaveCloseHandler(mw_WaveCloseMessage);
mw.WaveDoneMessage += new WaveDoneHandler(mw_WaveDoneMessage);
// add it to the global array
m_mwArray.Add(mw);
int i = m_mwArray.Count - 1;
if (playStream is ACMStream)
{
m_streamArray.Add(playStream as ACMStream);
}
else if (playStream is RiffStream)
{
m_streamArray.Add(playStream as RiffStream);
}
else
{
m_streamArray.Add(ACMStream.OpenRead(playStream));
}
m_format = (m_streamArray[m_streamArray.Count - 1] as RiffStream).Format;
// open the waveOut device and register the callback
CheckWaveError(NativeMethods.waveOutOpen(out m_hWaveOut, m_deviceID, m_format.GetBytes(), m_mwArray[i].Hwnd, 0, CALLBACK_WINDOW));
// see if we need to adjust playback rate
if ((PlaybackRate < 0.9f) || (PlaybackRate > 1.1f))
{
SetPlaybackRate(PlaybackRate);
}
RefillPlayBuffers();
while (m_qBuffers.Count > 0)
{
Monitor.Enter(m_qBuffers);
WaveHeader hdr = m_qBuffers.Dequeue();
Monitor.Exit(m_qBuffers);
// play the file
ThreadPool.QueueUserWorkItem(BufferWriteThreadProc, hdr);
m_playing = true;
if (m_qBuffers.Count <= 1)
{
RefillPlayBuffers();
}
}
#endif
}
finally
{
Monitor.Exit(m_syncRoot);
}
}
