public async Task PlayWave(RiffCodec riff)
{
uint WAVE_MAPPER = uint.MaxValue;
int CALLBACK_NULL = 0;
IntPtr handle = IntPtr.Zero;
var header = riff.FormatHeader as WaveFormatHeader;
int duration = Convert.ToInt32(header.AvgBytesPerSec / header.SampleRate);
var waveFormat = new WAVEFORMAT
{
wFormatTag = header.FormatTag,
nChannels = header.ChannelsCount,
nSamplesPerSec = header.SampleRate,
nAvgBytesPerSec = header.AvgBytesPerSec,
nBlockAlign = header.BlockAlign,
wBitsPerSample = header.BitsPerSample,
cbSize = header.ExtraInfoSize
};
var waveHdr = new WAVEHDR
{
dwBufferLength = riff.DataSize,
dwBytesRecorded = riff.DataSize,
dwUser = 0,
dwFlags = 0,
dwLoops = 0
};
using var buffer = new UnamanagedMemory((int)riff.DataSize);
Marshal.Copy(riff.Data, 0, buffer.Pointer, riff.Data.Length);
waveHdr.lpData = buffer.Pointer;
uint res = uint.MaxValue;
res = WindowsMultimedia.waveOutOpen(ref handle, WAVE_MAPPER, ref waveFormat, 0, 0, CALLBACK_NULL);
CheckMethodResult(nameof(WindowsMultimedia.waveOutOpen), res);
res = WindowsMultimedia.waveOutPrepareHeader(handle, ref waveHdr, Marshal.SizeOf(waveHdr));
CheckMethodResult(nameof(WindowsMultimedia.waveOutPrepareHeader), res);
res = WindowsMultimedia.waveOutWrite(handle, ref waveHdr, Marshal.SizeOf(waveHdr));
CheckMethodResult(nameof(WindowsMultimedia.waveOutWrite), res);
await Task.Delay(duration * 1000);
res = WindowsMultimedia.waveOutClose(handle);
CheckMethodResult(nameof(WindowsMultimedia.waveOutClose), res);
}
public static extern int waveOutOpen(ref IntPtr t, uint id, ref WAVEFORMAT pwfx, IntPtr dwCallback, int dwInstance, int fdwOpen);
public static extern int waveInOpen(out IntPtr phwi, int uDeviceID, WAVEFORMAT lpFormat, int dwCallback, int dwInstance, int dwFlags);
public static extern int waveOutOpen( ref int lphWaveOut, int uDeviceID, ref WAVEFORMAT lpFormat, int dwCallback, int dwInstance, int dwFlags );
public static extern int mmioRead(IntPtr hmmio, ref WAVEFORMAT pch, int cch);
public static extern uint waveOutOpen(ref IntPtr phwo, uint uDeviceID, ref WAVEFORMAT pwfx, int dwCallback, int dwInstance, int fdwOpen);
