C# Definition:

TODO

Definition Untested!!

[StructLayout(LayoutKind.Sequential)]
public class WaveFormatExtensible
{
    //WAVEFORMATEX
    public ushort wFormatTag;
    public ushort nChannels;
    public uint nSamplesPerSec;
    public uint nAvgBytesPerSec;
    public ushort nBlockAlign;
    public ushort wBitsPerSample;
    public ushort cbSize;
    //WAVEFORMATEXTENSIBLE
    public ushort wValidBitsPerSample;
    public uint dwChannelMask;
    public Guid SubFormat;
}

VB Definition:

<StructLayout(LayoutKind.Sequential, pack:=1)> Public Structure WAVEFORMATEXTENSIBLE
    Dim Format As WAVEFORMATEX
    'union {
    'WORD  wValidBitsPerSample;
    'WORD  wSamplesPerBlock;
    'WORD  wReserved;
    ';} Samples;
    Dim wUnionSamples As UInt16
    Dim dwChannelMask As UInteger
    Dim SubFormat As Guid
End Structure

User-Defined Field Types:

None.

Notes:

VB - wUnionSamples replaces the union of 3 values commented out above it as a union is not possible in VB - just put the value into wUnionSamples for whichever of the wValidBitsPerSample/wSamplesPerBlock/wReserved required based on the SubFormat.

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