ONVIF应用开发者指南1.0版：详解与授权

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ONVIF (Open Network Video Interface Forum) 是一个国际性的标准化组织，致力于制定网络视频接口标准，以便于不同制造商之间的设备互操作性。ONVIF TM Application Programmer's Guide Version 1.0，发布于2011年5月，提供了关于ONVIF技术的详尽指导，目标是促进视频监控系统的开放性和互操作性。该文档的核心内容包括了ONVIF技术的基本架构、协议规范以及开发人员指南。开发者可以利用这份文档来理解和实现符合ONVIF标准的网络视频设备，如网络摄像机、视频管理服务器（NVR）和视频解码器等。它定义了一系列的通信接口和服务，如媒体访问控制（Media Access Control, MAC）、媒体流传输（Media Streaming）和事件服务（Event Services），这些都是构建安全、高效的视频监控系统的关键组件。在安全方面，ONVIF强调了版权保护，声明所有复制、分发、出版或展示此文档时必须保留版权信息、许可和免责声明，这确保了知识产权的尊重。同时，该文档明确指出，所提供的内容“按原样提供”，并不保证其适用于特定用途，也不担保其不会侵犯任何专利、版权、商标或其他权利。这意味着开发者在使用ONVIF技术时需自行评估其合法性，并承担潜在的法律责任。此外，文档还明确了责任限制，即无论是ONVIF组织本身，还是其成员及其关联公司，都不对因使用或分发此文档导致的任何直接、间接、特殊、偶然或连带损失负责，包括但不限于经济损失或商业中断。 ONVIF TM Application Programmer's Guide Version 1.0是为那些希望开发兼容ONVIF标准的网络视频解决方案的开发者提供的宝贵参考资料，它详细介绍了如何设计和实施符合ONVIF规范的接口，以期推动视频监控行业技术的统一和互操作性。对于安防和IT专业人士来说，理解和遵循这一文档是实现设备间无缝集成，提高监控效率的重要一步。

ONVIF

– 16 – ONVIF APG - Ver. 1.0

5 Initial Setup and Administration

5.1

First Actions After Discovery

After ONVIF devices are discovered using WS-Discovery, you would typically access a device

using the supplied XAddrs to test where it is reachable. Use device.GetSystemDateAndTime

to accomplish this because it should not require authentication. You can also consider calling

device.GetDeviceInformation and device.GetCapabilities.

5.1.1 Prerequisites

 Devices must already be discovered.

 At least one valid XAddrs for the device service entry point.

5.1.2 Targeted Services and Technologies

 [ONVIF/Device] and [devicemgmt.wsdl]

5.1.3 ONVIF::ProcessMatch

When processing the list of discovered devices, first do a

device.GetDeviceSystemDateAndTime() call:

 To determine if the device is reachable with the supplied XAddr

 To obtain the device time

 To determine the time offset, which will be used later when authenticating (see Section

6.1, Authentication, for more information)

he following subfunction describes how a ProbeMatch message should be processed. It takes

the following parameter:

 aProbeMatch - A ProbeMatch message received as reaction to a Probe request.

// Try to connect to the device and store the XAddr that works.

// Use GetSystemDateAndTime for checking and to get the time offset.

// Find out information and capabilities etc.

ProcessMatch(aProbeMatch)

{

// For authentication to work, it is important to have

// the same time in device and client so the Created time

// is not off with too much. E.g. 5 seconds.

// device.GetSystemDateAndTime should not require authentication,

// we use that function to check the XAddrs in the ProbeMatch response.

// onvifdev is a placeholder that we populate with valid XAddr,

// authentication info and capabilities etc.

onvifdev = App.createNewDeviceInstance();

device = null;

systemDateAndTime = ONVIF::CheckXaddrsAndGetTime(device, onvifdev, aProbeMatch);

if (!aSystemDateAndTime) {

// No valid response – probably communication or authentication failure!

// Return and try next XAddr

return;

}

// Generate a time offset based on device time

// Either UTCDateTime or LocalDateTime or both should be present.

devicetime = ParseSystemDateAndTime(aSystemDateAndTime);

ONVIF

– 17 – ONVIF APG - Ver. 1.0

// Store time offset in the device place holder for later use

// when creating service objects and handling authentication.

onvifdev.timeoffset = devicetime - time(NULL) - 1;

// Assign desired username and password to be used

// (framework dependant). See chapter 6.1 for details.

App.SetAuthenticationInformation(onvifdev);

ONVIF::UpdateCapabilities(device ,onvifdev);

}

5.1.4 ONVIF::UpdateCapabilities

After you have established a valid way to communicate with the device, use actions such as

GetDeviceInformation, GetCapabilities, and possibly GetSystemLog to obtain state and

capabilities for the device. You also must obtain the URIs for the various services that the device

supports.

Parameters are:

 device – An instance that represents the device service.

 onvifdev – Data object for collecting and combining device-specific information that is

required for various services. For example, storing service URLs that are required for

media, PTZ, or other services.

UpdateCapabilities(device, onvifdev)

{

aDeviceInformation = device.GetDeviceInformation();

// Store/Process interesting stuff from DeviceInformation

onvifdev.model = aDeviceInformation.Model;

onvifdev.serial = aDeviceInformation.SerialNumber;

// Get the capabilities and

// store all or interesting portions of the capabilities.

onvifdev.capabilities = device.GetCapabilities(Category = "All");

// Store the XAddr of the different services - these will be used

// later on when accessing Events and Media service.

onvifdev.devicexaddr = onvifdev.capabilities.Device.XAddr;

onvifdev.eventsxaddr = onvifdev.capabilities.Events.XAddr;

onvifdev.mediaxaddr = onvifdev.capabilities.Media.XAddr;

// Other and future ONVIF devices may have additional services

// If Capabilities/System/SystemLogging is true,

// the log could be interesting.

if (aProbeMatch.capabilities.System.SystemLogging) {

log = device.GetSystemLog(LogType = "System");

App.CheckLog(onvifdev, log);

}

NOTICE:

Service addresses are not fixed. They vary according to the vendor and device,

and might require different handling. Therefore, this information must be

updated dynamically.

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