Audio Data Formats 1.0 - USB_AUDIO@WIKI

原文：Audio Data Formats 1.0(PDF)

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USB Device Class Definition for Audio Data Formats
Release 1.0 March 18, 1998 i

Universal Serial Bus

Device Class Definition

for

Audio Data Formats

Release 1.0

March 18, 1998

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USB Device Class Definition for Audio Data Formats
Release 1.0 March 18, 1998 ii

Scope of This Release

This document is the 1.0 release of this device class definition.

Contributors

Gal Ashour IBM Corporation
Billy Brackenridge Microsoft Corporation
Oren Tirosh Altec Lansing
Craig Todd Dolby Laboratories
Remy Zimmermann Logitech
Geert Knapen Philips ITCL
Interleuvenlaan 74-76
B-3001 Leuven-Heverlee BELGIUM
Phone: [phone]
Fax: [phone]
E-mail: Geert.Knapen(at)innet.be

Revision History

Revision	Date	Filename	Author	Description
0.1	Dec. 1, 96	Frmts01.doc	Geert Knapen	Initial version
0.2	Jan. 1, 97	Frmts02.doc	Geert Knapen	Corrected typos.
0.3	Mar. 1, 97	Frmts03.doc	Geert Knapen	Adapted template and contents to correspond with core document.
0.9rc	Apr. 1, 97	Frmts09rc.doc	Geert Knapen	Brought in line with core document. Added Type II descriptors and requests.
0.9	May 1, 97	Frmts09.doc	Geert Knapen	Added details for MPEG and AC-3. Added format-specific requests.
0.9CE	Sep 1, 97	Frmts09CE.doc	Geert Knapen	Copy-edited for publication on the web.
0.9a	Oct 1, 97	Frmts09a.doc	Geert Knapen	Incorporated RRs
1.0RC	Mar 1, 98	Frmts10RC.doc	Geert Knapen	Added the Transfer Delimiter concept. Cleaned up the formatting.
1.0	Mar 18, 98	Frmts10.doc	Geert Knapen	Changed all references to 1.0

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USB Device Class Definition for Audio Data Formats
Release 1.0 March 18, 1998 iii

Copyright © 1997, USB Implementers Forum
All rights reserved.

INTELLECTUAL PROPERTY DISCLAIMER

THIS SPECIFICATION IS PROVIDED “AS IS” WITH NO WARRANTIES WHATSOEVER INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE.

A LICENSE IS HEREBY GRANTED TO REPRODUCE AND DISTRIBUTE THIS SPECIFICATION FOR INTERNAL USE ONLY. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY OTHER INTELLECTUAL PROPERTY RIGHTS IS GRANTED OR INTENDED HEREBY.

AUTHORS OF THIS SPECIFICATION DISCLAIM ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF PROPRIETARY RIGHTS, RELATING TO IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. AUTHORS OF THIS SPECIFICATION ALSO DO NOT WARRANT OR REPRESENT THAT SUCH IMPLEMENTATION(S) WILL NOT INFRINGE SUCH RIGHTS.

Dolby™, AC-3™, Pro Logic™ and Dolby Surround™ are trademarks of Dolby Laboratories, Inc.
All other product names are trademarks, registered trademarks, or service marks of their respective owners.

Please send comments via electronic mail to techsup(atusb.org)

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USB Device Class Definition for Audio Data Formats
Release 1.0 March 18, 1998 iv

Table of Contents

Scope of This Release.........................................................................................................ii

Contributors........................................................................................................................ii

Revision History ..................................................................................................................ii

Table of Contents ...............................................................................................................iv

List of Tables .......................................................................................................................v

1 Introduction ..................................................................................................................6

1.1 Related Documents .................................................................................................6
1.2 Terms and Abbreviations.........................................................................................6

2 Audio Data Formats......................................................................................................8

2.1 Transfer Delimiter....................................................................................................8
2.2 Type I Formats ........................................................................................................8
2.2.1 USB Packets ....................................................................................................8
2.2.2 Audio Subframe................................................................................................9
2.2.3 Audio Frame.....................................................................................................9
2.2.4 Audio Streams ..................................................................................................9
2.2.5 Type I Format Type Descriptor .......................................................................10
2.2.6 Supported Formats .........................................................................................11
2.3 Type II Formats .....................................................................................................12
2.3.1 Encoded Audio Frames...................................................................................12
2.3.2 Audio Bitstreams.............................................................................................12
2.3.3 USB Packets ..................................................................................................13
2.3.4 Bandwidth Allocation.......................................................................................13
2.3.5 Timing ............................................................................................................13
2.3.6 Type II Format Type Descriptor ......................................................................13
2.3.7 Rate feedback ................................................................................................15
2.3.8 Supported Formats .........................................................................................15
2.4 Type III Formats ....................................................................................................26
2.4.1 Type III Format Type Descriptor .....................................................................26

3 Adding New Audio Data Formats ..............................................................................28

Appendix A. Additional Audio Device Class Codes .....................................................29

A.1 Audio Data Format Codes......................................................................................29
A.1.1 Audio Data Format Type I Codes....................................................................29
A.1.2 Audio Data Format Type II Codes...................................................................29
A.1.3 Audio Data Format Type III Codes..................................................................29
A.2 Format Type Codes ...............................................................................................30
A.1 Format-Specific Control Selectors .........................................................................30
A.3 ..................................................................................................................................30
A.3.1 MPEG Control Selectors.................................................................................30
A.3.2 AC-3 Control Selectors ...................................................................................30

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USB Device Class Definition for Audio Data Formats
Release 1.0 March 18, 1998 v

List of Tables

Table 2-1: Type I Format Type Descriptor........................................................................10
Table 2-2: Continuous Sampling Frequency ...................................................................10
Table 2-3: Discrete Number of Sampling Frequencies....................................................11
Table 2-4: Type II Format Type Descriptor.......................................................................13
Table 2-5: Continuous Sampling Frequency ...................................................................14
Table 2-6: Discrete Number of Sampling Frequencies....................................................14
Table 2-7: MPEG Format-Specific Descriptor ..................................................................16
Table 2-8: Set MPEG Control Request Values .................................................................18
Table 2-9: Get MPEG Control Request Values.................................................................18
Table 2-10: Dual Channel Control Parameter Block ........................................................19
Table 2-11: Second Stereo Control Parameter Block ......................................................19
Table 2-12: Multilingual Control Parameter Block...........................................................20
Table 2-13: Dynamic Range Control Parameter Block ....................................................20
Table 2-14: Scaling Control Parameter Block ..................................................................21
Table 2-15: High/Low Scaling Control Parameter Block .................................................21
Table 2-16: AC-3 Format-Specific Descriptor...................................................................22
Table 2-17: Set AC-3 Control Request Values..................................................................23
Table 2-18: Get AC-3 Control Request Values .................................................................23
Table 2-19: Mode Control Parameter Block .....................................................................24
Table 2-20: Dynamic Range Control Parameter Block ....................................................24
Table 2-21: Scaling Control Parameter Block ..................................................................25
Table 2-22: High/Low Scaling Control Parameter Block .................................................25
Table 2-23: Type III Format Type Descriptor....................................................................26
Table 2-24: Continuous Sampling Frequency .................................................................27
Table 2-25: Discrete Number of Sampling Frequencies..................................................27
Table A-1: Audio Data Format Type I Codes....................................................................29
Table A-2: Audio Data Format Type II Codes...................................................................29
Table A-3: Audio Data Format Type III Codes..................................................................29
Table A-4: Format Type Codes .........................................................................................30
Table A-5: MPEG Control Selectors .................................................................................30
Table A-6: AC-3 Control Selectors....................................................................................30

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