typedef struct _WAVE_FORMAT_CHUNK {
  USHORT m__USHORT__Format;
  USHORT m__USHORT__Channels;
  ULONG m__ULONG__SamplesPerSecond;
  ULONG m__ULONG__AverageSamplesPerSecond;
  USHORT m__USHORT__Alignment;
  USHORT m__USHORT__BitsPerSample;
} * PWAVE_FORMAT_CHUNK, WAVE_FORMAT_CHUNK;