In audiosessiontypes.h is "typedef enum _AUDCLNT_SHAREMODE" but not exact value of the AUDCLNT_SHAREMODE_SHARED.
Not found in the Windows 10 SDK or on the Internet.
enum values start at 0 so
typedef enum _AUDCLNT_SHAREMODE
{
AUDCLNT_SHAREMODE_SHARED,
AUDCLNT_SHAREMODE_EXCLUSIVE
} AUDCLNT_SHAREMODE;
is effectively the same as
typedef enum _AUDCLNT_SHAREMODE
{
AUDCLNT_SHAREMODE_SHARED = 0,
AUDCLNT_SHAREMODE_EXCLUSIVE = 1
} AUDCLNT_SHAREMODE;