/// <summary>
/// Retrieves the stream format that the audio engine uses for its
/// internal processing of shared-mode streams.
/// </summary>
/// <param name="deviceFormat">
/// Retrieves the mix format that the audio engine uses for its internal processing of
/// shared-mode streams.
/// </param>
/// <remarks>
/// For more information, see
/// <see href="https://msdn.microsoft.com/en-us/library/windows/desktop/dd370872(v=vs.85).aspx" />.
/// </remarks>
/// <returns>HRESULT</returns>
public unsafe int GetMixFormatNative(out WaveFormat deviceFormat)
{
IntPtr pdeviceFormat = IntPtr.Zero;
int result;
if ((result = InteropCalls.CallI(UnsafeBasePtr, &pdeviceFormat, ((void **)(*(void **)UnsafeBasePtr))[8])) ==
0 && pdeviceFormat != IntPtr.Zero)
{
try
{
//deviceFormat = Marshal.PtrToStructure(pdeviceFormat, typeof (WaveFormat)) as WaveFormat;
//if (deviceFormat != null && deviceFormat.WaveFormatTag == AudioEncoding.Extensible)
//{
// deviceFormat =
// Marshal.PtrToStructure(pdeviceFormat, typeof (WaveFormatExtensible)) as WaveFormatExtensible;
//}
deviceFormat = WaveFormatMarshaler.PointerToWaveFormat(pdeviceFormat);
}
finally
{
Marshal.FreeCoTaskMem(pdeviceFormat);
}
return(result);
}
deviceFormat = null;
return(result);
}
/// <summary>
/// Converts the <see cref="MFMediaType"/> to a <see cref="WaveFormat"/>.
/// </summary>
/// <param name="flags">Contains a flag from the <see cref="MFWaveFormatExConvertFlags"/> enumeration.</param>
/// <returns>The <see cref="WaveFormat"/> which got created based on the <see cref="MFMediaType"/>.</returns>
public unsafe WaveFormat ToWaveFormat(MFWaveFormatExConvertFlags flags)
{
IntPtr pointer = IntPtr.Zero;
try
{
int cbSize;
MediaFoundationException.Try(
NativeMethods.MFCreateWaveFormatExFromMFMediaType(BasePtr.ToPointer(), &pointer, &cbSize,
(int)flags), "Interop", "MFCreateWaveFormatExFromMFMediaType");
}
finally
{
Marshal.FreeCoTaskMem(pointer);
}
//var waveformat = (WaveFormat)Marshal.PtrToStructure(pointer, typeof(WaveFormat));
//if (waveformat.WaveFormatTag == AudioEncoding.Extensible)
// waveformat = (WaveFormatExtensible)Marshal.PtrToStructure(pointer, typeof(WaveFormatExtensible));
//return waveformat;
return(WaveFormatMarshaler.PointerToWaveFormat(pointer));
}
/// <summary>
/// Returns a description of the format of the sound data in the buffer.
/// </summary>
/// <returns>A description of the format of the sound data in the buffer. The returned description is either of the type <see cref="WaveFormat"/> or of the type <see cref="WaveFormatExtensible"/>.</returns>
public WaveFormat GetWaveFormat()
{
int size;
DSResult result = GetFormatNative(IntPtr.Zero, 0, out size);
DirectSoundException.Try(result, InterfaceName, "GetWaveFormat");
IntPtr ptr = Marshal.AllocCoTaskMem(size);
try
{
int n;
result = GetFormatNative(ptr, size, out n);
DirectSoundException.Try(result, InterfaceName, "GetWaveFormat");
return(WaveFormatMarshaler.PointerToWaveFormat(ptr));
}
finally
{
Marshal.FreeCoTaskMem(ptr);
}
}