public PCMUPlayer()
{
WinMM.WAVEFORMATEX waveFormat = new WinMM.WAVEFORMATEX()
{
FormatTag = WinMM.WaveFormat.WAVE_FORMAT_PCM, //WAVE_FORMAT_MULAW
Channels = 1, // один канал
SamplesPerSec = 8000, // частота дискретизации 8 kHz
AverageBytesPerSecond = 8000, // битрейт 8000 байт / сек.
BlockAlign = 2, //1 // (nChannels × wBitsPerSample) / 8
BitsPerSample = 16, //8 // количество бит на один отсчет
Size = 0 // размер расширения данной структуры
};
WinMM.waveOutOpen(ref ptrWaveOut, WinMM.WAVE_MAPPER, ref waveFormat, IntPtr.Zero, IntPtr.Zero, WinMM.CALLBACK_NULL);
}
public void PlayFromMemory(IntPtr ptr, int count)
{
WinMM.WAVEHDR waveHeader = new WinMM.WAVEHDR()
{
Data = ptr,
BufferLength = (uint)count,
BytesRecorded = 0,
User = IntPtr.Zero,
Flags = (WinMM.WaveHdrFlags) 0,
Loops = 0,
Next = IntPtr.Zero,
Reserved = IntPtr.Zero
};
IntPtr ptrWaveHeader = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(WinMM.WAVEHDR)));
Marshal.StructureToPtr(waveHeader, ptrWaveHeader, true);
WinMM.waveOutPrepareHeader(ptrWaveOut, ptrWaveHeader, Marshal.SizeOf(typeof(WinMM.WAVEHDR)));
WinMM.waveOutWrite(ptrWaveOut, ptrWaveHeader, Marshal.SizeOf(typeof(WinMM.WAVEHDR)));
Marshal.DestroyStructure(ptrWaveHeader, typeof(WinMM.WAVEHDR));
}
public void Dispose()
{
WinMM.waveOutClose(ptrWaveOut);
}