private void ReadHeader()
{
BinaryReader Reader = new BinaryReader(m_Stream);
if (ReadChunk(Reader) != "RIFF")
{
throw new Exception("Invalid file format");
}
Reader.ReadInt32(); // File length minus first 8 bytes of RIFF description, we don't use it
if (ReadChunk(Reader) != "WAVE")
{
throw new Exception("Invalid file format");
}
if (ReadChunk(Reader) != "fmt ")
{
throw new Exception("Invalid file format");
}
int len = Reader.ReadInt32();
if (len < 16) // bad format chunk length
{
throw new Exception("Invalid file format");
}
m_Format = new WinWaveFormat(22050, 16, 2); // initialize to any format
m_Format.wFormatTag = Reader.ReadInt16();
m_Format.nChannels = Reader.ReadInt16();
m_Format.nSamplesPerSec = Reader.ReadInt32();
m_Format.nAvgBytesPerSec = Reader.ReadInt32();
m_Format.nBlockAlign = Reader.ReadInt16();
m_Format.wBitsPerSample = Reader.ReadInt16();
// advance in the stream to skip the wave format block
len -= 16; // minimum format size
while (len > 0)
{
Reader.ReadByte();
len--;
}
// assume the data chunk is aligned
while (m_Stream.Position < m_Stream.Length && ReadChunk(Reader) != "data")
{
;
}
if (m_Stream.Position >= m_Stream.Length)
{
throw new Exception("Invalid file format");
}
m_Length = Reader.ReadInt32();
m_DataPos = m_Stream.Position;
Position = 0;
}
public WaveOutPlayer(int device, WinWaveFormat 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();
}
public static extern int waveOutOpen(out IntPtr hWaveOut, int uDeviceID, WinWaveFormat lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
