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diff --git a/Protocol/SimpleAudioOut/SimpleAudioOut.h b/Protocol/SimpleAudioOut/SimpleAudioOut.h
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+//
+// This file contains 'Framework Code' and is licensed as such 
+// under the terms of your license agreement with Intel or your
+// vendor.  This file may not be modified, except as allowed by
+// additional terms of your license agreement.                 
+//
+/*++
+
+Copyright (c)  1999 - 2002 Intel Corporation. All rights reserved
+This software and associated documentation (if any) is furnished
+under a license and may only be used or copied in accordance
+with the terms of the license. Except as permitted by such
+license, no part of this software or documentation may be
+reproduced, stored in a retrieval system, or transmitted in any
+form or by any means without the express written consent of
+Intel Corporation.
+
+
+Module Name:
+
+    SimpleAudioOut.h
+    
+Abstract:
+
+    EFI Simple Audio Out Protocol 
+
+Revision History
+
+--*/
+
+#ifndef _EFI_SIMPLE_AUDIO_OUT_H_
+#define _EFI_SIMPLE_AUDIO_OUT_H_
+
+//
+// GUID for Simple Audio Out Protocol
+//
+#define EFI_SIMPLE_AUDIO_OUT_PROTOCOL_GUID \
+  { \
+    0xc723f288, 0x52f9, 0x4d80, 0xb6, 0x33, 0xe1, 0x52, 0xf9, 0x30, 0xa0, 0xdc \
+  }
+
+EFI_FORWARD_DECLARATION (EFI_SIMPLE_AUDIO_OUT_PROTOCOL);
+
+typedef enum {
+  EfiAudioOutStart,
+  EfiAudioOutPause,
+  EfiAudioOutContinue,
+  EfiAudioOutStop
+} EFI_SIMPLE_AUDIO_OUT_OPERATION;
+
+typedef
+EFI_STATUS
+(EFIAPI *EFI_SIMPLE_AUDIO_OUT_STREAM_OPERATION) (
+  IN EFI_SIMPLE_AUDIO_OUT_PROTOCOL                         * This,
+  IN     EFI_SIMPLE_AUDIO_OUT_OPERATION                    Operation,
+  IN     UINT8                                             *Buffer OPTIONAL,
+  IN     UINT32                                            BufferSize OPTIONAL
+  );
+
+#define EFI_SIMPLE_AUDIO_OUT_STATE_BUFFER_DRAIN 0x00000001
+
+typedef
+EFI_STATUS
+(EFIAPI *EFI_SIMPLE_AUDIO_OUT_QUERY_STATE) (
+  IN EFI_SIMPLE_AUDIO_OUT_PROTOCOL           * This,
+  OUT UINT32                                 *State
+  );
+
+//
+// Ac97 Audio channel definition
+//
+typedef enum _AC97_AUDIO_CHANNEL_NUMBER
+{
+  Ac97Channels2       = 0,
+  Ac97Channels4       = 1,
+  Ac97Channels6       = 2,
+} AC97_AUDIO_CHANNEL_NUMBER;
+
+//
+// Ac97 Audio mode definition
+//
+typedef enum _AC97_AUDIO_PCM_MODE
+{
+  Ac97Audio16Bit      = 0,
+  Ac97Audio20Bit      = 1,
+} AC97_AUDIO_PCM_MODE;
+
+//
+// Ac97 Audio volume definition
+//
+#pragma pack(1)
+
+typedef struct {
+  UINT16  RigthChannelVol : 6;
+  UINT16  Reserved1 : 2;
+  UINT16  LeftChannelVol : 6;
+  UINT16  Reserved2 : 1;
+  UINT16  Mute : 1;
+} AC97_AUDIO_GENERAL_VOLUME;
+
+typedef struct {
+  UINT16  Treble : 4;
+  UINT16  Reserved1 : 4;
+  UINT16  Bass : 4;
+  UINT16  Reserved2 : 4;
+} AC97_AUDIO_GENERAL_TONE;
+
+#pragma pack()
+//
+// Ac97 Audio driver attribute definition
+//
+typedef enum {
+  EfiAudioOutChannelNumber,
+  EfiAudioOutSampleRate,
+  EfiAudioOutPcmMode,
+  EfiAudioOutMasterVolume,
+  EfiAudioOutAuxVolume,
+  EfiAudioOutMonoVolume,
+  EfiAudioOutMasterTone,
+} EFI_SIMPLE_AUDIO_OUT_ATTRIBUTE_TARGET;
+
+typedef
+EFI_STATUS
+(EFIAPI *EFI_SIMPLE_AUDIO_OUT_GET_ATTRIBUTE) (
+  IN EFI_SIMPLE_AUDIO_OUT_PROTOCOL              * This,
+  IN     EFI_SIMPLE_AUDIO_OUT_ATTRIBUTE_TARGET  Target,
+  OUT VOID                                      *Buffer,
+  IN     UINT32                                 BufferSize
+  );
+
+typedef
+EFI_STATUS
+(EFIAPI *EFI_SIMPLE_AUDIO_OUT_SET_ATTRIBUTE) (
+  IN EFI_SIMPLE_AUDIO_OUT_PROTOCOL              * This,
+  IN     EFI_SIMPLE_AUDIO_OUT_ATTRIBUTE_TARGET  Target,
+  IN     VOID                                   *Buffer,
+  IN     UINT32                                 BufferSize
+  );
+
+typedef struct _EFI_SIMPLE_AUDIO_OUT_PROTOCOL {
+  EFI_SIMPLE_AUDIO_OUT_STREAM_OPERATION StreamOperation;
+  EFI_SIMPLE_AUDIO_OUT_QUERY_STATE      QueryState;
+  EFI_SIMPLE_AUDIO_OUT_GET_ATTRIBUTE    GetAttribute;
+  EFI_SIMPLE_AUDIO_OUT_SET_ATTRIBUTE    SetAttribute;
+} EFI_SIMPLE_AUDIO_OUT_PROTOCOL;
+
+extern EFI_GUID gEfiSimpleAudioOutProtocolGuid;
+
+#endif