/// <summary>
/// Plays specified audio data bytes. If player is currently playing, data will be queued for playing.
/// </summary>
/// <param name="audioData">Audio data. Data boundary must n * BlockSize.</param>
/// <param name="offset">Offset in the buffer.</param>
/// <param name="count">Number of bytes to play form the specified offset.</param>
/// <exception cref="ObjectDisposedException">Is raised when this object is disposed and this method is accessed.</exception>
/// <exception cref="ArgumentNullException">Is raised when <b>audioData</b> is null.</exception>
/// <exception cref="ArgumentException">Is raised when <b>audioData</b> is with invalid length.</exception>
public void Play(byte[] audioData,int offset,int count)
{
if(m_IsDisposed){
throw new ObjectDisposedException("WaveOut");
}
if(audioData == null){
throw new ArgumentNullException("audioData");
}
if((count % m_BlockSize) != 0){
throw new ArgumentException("Audio data is not n * BlockSize.");
}
//--- Queue specified audio block for play. --------------------------------------------------------
byte[] data = new byte[count];
Array.Copy(audioData,offset,data,0,count);
GCHandle dataHandle = GCHandle.Alloc(data,GCHandleType.Pinned);
// m_BytesBuffered += data.Length;
WAVEHDR wavHeader = new WAVEHDR();
wavHeader.lpData = dataHandle.AddrOfPinnedObject();
wavHeader.dwBufferLength = (uint)data.Length;
wavHeader.dwBytesRecorded = 0;
wavHeader.dwUser = IntPtr.Zero;
wavHeader.dwFlags = 0;
wavHeader.dwLoops = 0;
wavHeader.lpNext = IntPtr.Zero;
wavHeader.reserved = 0;
GCHandle headerHandle = GCHandle.Alloc(wavHeader,GCHandleType.Pinned);
int result = 0;
result = WavMethods.waveOutPrepareHeader(m_pWavDevHandle,headerHandle.AddrOfPinnedObject(),Marshal.SizeOf(wavHeader));
if(result == MMSYSERR.NOERROR){
PlayItem item = new PlayItem(ref headerHandle,ref dataHandle,data.Length);
m_pPlayItems.Add(item);
// We ran out of minimum buffer, we must pause playing while min buffer filled.
if(m_BytesBuffered < 1000){
if(!m_IsPaused){
WavMethods.waveOutPause(m_pWavDevHandle);
m_IsPaused = true;
}
//File.AppendAllText("aaaa.txt","Begin buffer\r\n");
}
// Buffering completed,we may resume playing.
else if(m_IsPaused && m_BytesBuffered > m_MinBuffer){
WavMethods.waveOutRestart(m_pWavDevHandle);
m_IsPaused = false;
//File.AppendAllText("aaaa.txt","end buffer: " + m_BytesBuffered + "\r\n");
}
/*
// TODO: If we ran out of minimum buffer, we must pause playing while min buffer filled.
if(m_BytesBuffered < m_MinBuffer){
if(!m_IsPaused){
WavMethods.waveOutPause(m_pWavDevHandle);
m_IsPaused = true;
}
}
else if(m_IsPaused){
WavMethods.waveOutRestart(m_pWavDevHandle);
}*/
m_BytesBuffered += data.Length;
result = WavMethods.waveOutWrite(m_pWavDevHandle,headerHandle.AddrOfPinnedObject(),Marshal.SizeOf(wavHeader));
}
else{
dataHandle.Free();
headerHandle.Free();
}
//--------------------------------------------------------------------------------------------------
}
/// <summary>
/// Fills recording buffers.
/// </summary>
private void EnsureBuffers()
{
// We keep 3 x buffer.
lock(m_pBuffers){
while(m_pBuffers.Count < 3){
byte[] data = new byte[m_BufferSize];
GCHandle dataHandle = GCHandle.Alloc(data,GCHandleType.Pinned);
WAVEHDR wavHeader = new WAVEHDR();
wavHeader.lpData = dataHandle.AddrOfPinnedObject();
wavHeader.dwBufferLength = (uint)data.Length;
wavHeader.dwBytesRecorded = 0;
wavHeader.dwUser = IntPtr.Zero;
wavHeader.dwFlags = 0;
wavHeader.dwLoops = 0;
wavHeader.lpNext = IntPtr.Zero;
wavHeader.reserved = 0;
GCHandle headerHandle = GCHandle.Alloc(wavHeader,GCHandleType.Pinned);
int result = 0;
result = WavMethods.waveInPrepareHeader(m_pWavDevHandle,headerHandle.AddrOfPinnedObject(),Marshal.SizeOf(wavHeader));
if(result == MMSYSERR.NOERROR){
m_pBuffers.Add(new BufferItem(ref headerHandle,ref dataHandle,m_BufferSize));
result = WavMethods.waveInAddBuffer(m_pWavDevHandle,headerHandle.AddrOfPinnedObject(),Marshal.SizeOf(wavHeader));
if(result != MMSYSERR.NOERROR){
throw new Exception("Error adding wave in buffer, error: " + result + ".");
}
}
}
}
}
