车载以太网AVB协议详解：AVDECC IEEE1722.1-2013标准

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"车载以太网AVB协议规范AVDECC IEEE1722.1-2013" 在汽车行业中，随着自动驾驶和智能交通系统的发展，车载通信技术变得越来越重要。车载以太网AVB（Audio/Video Bridging）协议规范AVDECC（Audio Video Device Control over Ethernet）是这一领域的一个关键标准，它基于IEEE 802.1协议族，特别是针对IEEE 1722.1设备的发现、连接管理和控制协议。这个规范共包含了366页的内容，详细阐述了如何在车载环境中实现高效、低延迟和高时钟精度的音视频数据传输。 Ethernet AVB的核心目标是提供优质的实时服务（QoS），这在音视频应用中至关重要。它通过确保带宽分配、限制网络延迟以及实现精确的时钟同步，使得车载网络能够支持复杂多媒体应用，如高级驾驶辅助系统（ADAS）、信息娱乐系统等，同时保持与传统以太网的完全兼容性。 IEEE 1722.1标准主要关注设备的发现、连接管理和控制，这是AVB系统中的关键环节。设备发现允许网络中的设备自动识别并建立连接，这对于动态变化的车载环境尤其重要。连接管理则涉及数据流的设置、配置和维护，确保数据能够在正确的时间到达正确的目的地。而控制协议则允许设备进行参数调整、状态查询和故障诊断，以优化网络性能。 AVDECC是AVB的一部分，专门处理基于IEEE 1722的设备的控制。它定义了一套控制协议，使得设备可以被远程控制和监控，例如音视频设备的设置更改、播放控制、信号路由等。AVDECC使得车载环境中的多媒体设备能够实现智能化、自动化操作，提升用户体验并降低系统集成的复杂度。 AVB和AVDECC IEEE 1722.1-2013标准为车载以太网提供了强大的技术支持，不仅提升了车载通信的效率和质量，还为未来智能车辆和车联网的发展奠定了坚实的基础。这一标准的实施，将推动汽车行业的创新，促进更安全、更智能的交通系统的实现。

IEEE Std 1722.1-2013

IEEE Standard for Device Discovery, Connection Management, and Control Protocol for IEEE 1722™ Based Devices

An AVDECC Controller may exist within an AVDECC Talker or an AVDECC Listener, or exist remotely

within the network in a separate End Station. The AVDECC Controller can use the individual steps to find,

connect, and control entities on the network, but it may choose to not use all of the steps if the AVDECC

Controller already knows some of the information (e.g., hard coded values assigned by user/hardware

switch or values from previous session establishment) that can be gained in using the steps. The only

required step is connection management, because this is the step that establishes the bandwidth usage and

reservations across the audio video bridging (AVB) domain.

The four steps are described as follows:

 Discovery is the process of finding AVDECC Entities on the LAN that have services that are

useful to the other AVDECC Entities on the network. The discovery process also covers the

termination of the publication of those services on the network.

 Enumeration is the process of collecting information from the AVDECC Entity that could help an

AVDECC Controller to use the capabilities of the AVDECC Entity. This information can be used

for connection management.

 Connection management is the process of connecting or disconnecting one or more Streams

between two or more AVDECC Entities.

 Control is the process of adjusting a parameter on the AVDECC Entity from an AVDECC

Controller. There are a number of standard types of controls used in media devices like volume

control, mute control, etc. A framework of basic commands allows the control process to be

extended by AVDECC Entities.

These four steps are the basis of this standard and will be described in detail in the following sections.

1.1 Scope

This standard specifies the protocol, device discovery, connection management, and device control

procedures used to facilitate interoperability between audio and video based End Stations that use IEEE

1722 based Streams on IEEE 802

based networks.

1.2 Purpose

This standard will facilitate interoperability between End Stations that stream time-sensitive media and data

across local area networks providing time synchronization and latency/bandwidth services. This standard

defines the device discovery, connection management, Stream setup, control, and teardown protocols.

Provided by IHS under license with IEEE

Not for Resale

No reproduction or networking permitted without license from IHS

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IEEE Std 1722.1-2013

IEEE Standard for Device Discovery, Connection Management, and Control Protocol for IEEE 1722™ Based Devices

2. Normative references

The following referenced documents are indispensable for the application of this document (i.e., they must

be understood and used, so each referenced document is cited in text and its relationship to this document is

explained). For dated references, only the edition cited applies. For undated references, the latest edition of

the referenced document (including any amendments or corrigenda) applies.

COLLADA-Digital Asset Schema Release 1.5.0 specification (April 2008).

High-bandwidth Digital Content Protection System – Interface Independent Adaptation.

IEC 60958, Digital audio interface (all parts).

IEC 61883-4:2004, Consumer Audio/Video Equipment—Digital Interface—Part 4: MPEG2-TS Data

Transmission.

IEC 61883-6:2005, Consumer Audio/Video Equipment—Digital Interface—Part 6: Audio and Music Data

Transmission Protocol.

IEC 61883-8:2008, Consumer Audio/Video Equipment—Digital Interface—Part 8: Transmission of ITU-R

BT.601 Style Digital Video Data.

IEEE Std 754™-2008, IEEE Standard for Floating Point Arithmetic.

3, 4

IEEE Std 802.1AS™-2011, IEEE Standard for Local and Metropolitan Area Networks—Timing and

Synchronization for Time-Sensitive Applications in Bridged Local Area Networks.

IEEE Std 802.1BA™-2011, IEEE Standard for Local and Metropolitan Area Networks—Audio Video

Bridging (AVB) Systems.

IEEE Std 802.1Q™-2011, IEEE Standard for Local and metropolitan area networks—Media Access

Control (MAC) Bridges and Virtual Bridged Local Area Networks.

IEEE Std 1363a™-2004, Standard Specifications For Public-Key Cryptography—Amendment 1:

Additional Techniques.

IEEE Std 1541™-2002, IEEE Standard for Prefixes for Binary Multiples.

IEEE Std 1722™-2011, IEEE Standard for Layer 2 Transport Protocol for Time Sensitive Applications in a

Bridged Local Area Network.

RFC 2435, RTP Payload Format for JPEG-compressed Video.

RFC 2616, Hypertext Transfer Protocol—HTTP/1.1.

RFC 5371, RTP Payload Format for JPEG 2000 Video Streams.

RFC 6184, RTP Payload Format for H.264 Video.

W3C Portable Network Graphics (PNG) Specification (Second Edition).

W3C Scalable Vector Graphics (SVG) 1.1 (Second Edition).

Available at http://www.khronos.org/files/collada_spec_1_5.pdf

Available at http://www.digital-cp.com/files/static_page_files/DABB540C-1A4B-B294-

D0008CB2D348FA19/HDCP%20Interface%20Independent%20Adaptation%20Specification%20Rev2_1.pdf

IEEE publications are available from The Institute of Electrical and Electronics Engineers (http://standards.ieee.org/).

The IEEE standards or products referred to in this clause are trademarks of The Institute of Electrical and Electronics Engineers, Inc.

Available at http://tools.ietf.org/html/rfc2435

Available at http://tools.ietf.org/html/rfc2616

Available at http://tools.ietf.org/html/rfc5371

Available at http://tools.ietf.org/html/rfc6184

Available at http://www.w3.org/TR/PNG/

Available at http://www.w3.org/TR/SVG/

Provided by IHS under license with IEEE

Not for Resale

No reproduction or networking permitted without license from IHS

--`,,```,,,,````-`-`,,`,,`,`,,`---

IEEE Std 1722.1-2013

IEEE Standard for Device Discovery, Connection Management, and Control Protocol for IEEE 1722™ Based Devices

3. Definitions, acronyms, and abbreviations

3.1 Definitions

For the purposes of this document, the following terms and definitions apply. The IEEE Standards

Dictionary Online should be consulted for terms not defined in this clause.

Active Stream: A data Stream associated with a stream reservation established using the Stream

Reservation Protocol (SRP), which has data flowing from a Talker to one or more Listeners.

ADAT

Optical Interface: The Alesis Digital Audio Tape Optical Interface digital audio interconnect.

12, 13

Audio Cluster: A group of audio channels in a stream.

Audio Map: A static mapping between an audio Stream’s channels and an Audio Cluster’s channels for

Streams and Stream Ports.

Audio Unit: A Unit for processing audio.

AVB domain: See IEEE Std 802.1BA™.

AVB Interface: An AVB capable network interface capable of sourcing or sinking Streams and

participating in an AVB domain.

AVDECC Controller: Any entity defined by this standard that initiates exchanges with any other entity

defined by this standard.

AVDECC Entity: A logical object within an End Station that can accept and respond to AVDECC

messages.

AVDECC Entity Model: A collection of objects that define the internal structure of the AVDECC Entity

and the flow of media through it.

AVDECC Listener: An AVDECC Entity that can transmit or receive the AVDECC protocol and is an

AVTP Listener.

AVDECC Proxy Client (APC): An End Station that implements the AVDECC Proxy Client state

machine.

AVDECC Proxy Protocol (APP): The TCP protocol used to transport AVDECC messages between an

AVDECC Proxy Client and an AVDECC Proxy Server.

AVDECC Proxy Server (APS): An End Station that implements the AVDECC Proxy Server state

machine.

AVDECC Talker: An AVDECC Entity that can transmit or receive the AVDECC protocol and is an

AVTP Talker.

AVTP End Station: An End Station that can transmit or receive the IEEE Std 1722™ protocol.

IEEE Standards Dictionary Online subscription is available at:

http://www.ieee.org/portal/innovate/products/standard/standards_dictionary.html

ADAT

is a registered trademark owned by ALESIS CORPORATION CORPORATION CALIFORNIA 3630 Holdrege Avenue

Los Angeles CALIFORNIA 90016.

This information is given for the convenience of users of this standard and does not constitute an endorsement by IEEE of these

products. Equivalent products may be used if they can be shown to lead to the same results.

Provided by IHS under license with IEEE

Not for Resale

No reproduction or networking permitted without license from IHS

--`,,```,,,,````-`-`,,`,,`,`,,`---

IEEE Std 1722.1-2013

IEEE Standard for Device Discovery, Connection Management, and Control Protocol for IEEE 1722™ Based Devices

AVTP gateway: A device that transports AVTP audio/video Streams between an AVB network and

another type of media (e.g., an IEEE Std 1394™ bus).

AVTP Listener: An End Station that implements a Listener as defined in IEEE Std 1722™.

AVTP Talker: An End Station that implements a Talker as defined in IEEE Std 1722™.

Clock Domain: A source of a common clock signal within an AVDECC Entity.

Clock Source: A source of timing information for a Clock Domain.

Configuration: A collection of objects that defines the internal structure for a particular setup of the

AVDECC Entity.

Control: A collection of descriptive meta-data and associated values for an observable and/or changeable

object within the AVDECC Entity representing a processing element or a transducer.

Control Block: A grouping of Controls.

End Station: See IEEE Std 802

Entity ID: The EUI-64 identifier of an AVDECC Entity.

External Port: A Port that connects to a Jack.

Internal Port: A Port that is connected to another Internal Port within an AVDECC Entity.

Jack: An ingress or egress point of a non-media-stream signal to or from an AVDECC Entity.

Matrix: A collection of orthogonal Controls arranged in a two dimensional array.

Media component: Fundamental data within an IEEE Std 1722™ stream payload.

Memory Object: An addressable region of memory within an AVDECC Entity.

Mixer: A Control that combines multiple signals into a single output signal.

Octlet: Eight octets of data.

Port: An ingress and egress point of a signal for a Unit.

Presentation time: A 32-bit unsigned field in units of 1 nanosecond.

Presentation time offset: A 64-bit signed field that defines an offset time in nanoseconds.

Reserved field: A data field that is reserved for future standardization and is set to 0 when transmitted and

ignored when received.

Sensor Cluster: An element of a Sensor Stream.

Sensor Map: A mapping between a Sensor Stream’s components and the Sensor Clusters for Streams and

Stream Ports that are located in the same Clock Domain.

Sensor Unit: A Unit for processing Sensors.

Signal Combiner: A Control for combining several signals into a single signal.

Provided by IHS under license with IEEE

Not for Resale

No reproduction or networking permitted without license from IHS

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