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Format of Volume Services Structure

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Offset Size Description

00h

4 BYTEs

name of the structure ("VOLS")

04h

DWORD

structure length (00000038h)

08h

16 BYTEs

16 bytes for future expansion (0)
entry points (details ???)

18h

DWORD

device check
0011h filter range
0012h filter setting
0013h filter current
0014h tone range
0015h tone setting
0016h tone current
0017h path
0018h get IO address
0080h - ... vendors can add DevChks above 0x80

1Ch

DWORD

set vol to an absolute setting
01h User master volume setting
02h application master volume setting

20h

DWORD

set 3D volume

24h

DWORD

tone control

28h

DWORD

filter control

2Ch

DWORD

output path

30h

DWORD

reset channel

34h

DWORD

get last error
01h unsupported feature/function
02h out of range parameter value
80h - ... vendor-specific errors

See Also:

#00116,#00120