我们知道LiveNVR中可以获取快照信息，之前的文章也说明了LiveNVR是如何进行快照抓取的

这里我们使用另一种方法进行快照的抓取

流程

获取设备能力Capabilities

获取设备的能力，并且可以获取到Media和PTZ的URI，使用Media的URI，可以进行快照的抓取

_tds__GetCapabilities* capabilities = soap_new__tds__GetCapabilities(proxyDevice, -1);
tt__CapabilityCategory* category = new tt__CapabilityCategory;
capabilities->Category = category;
*(capabilities->Category) = tt__CapabilityCategory__All;
_tds__GetCapabilitiesResponse* response = soap_new__tds__GetCapabilitiesResponse(proxyDevice, -1);
if (SOAP_OK == proxyDevice->GetCapabilities(capabilities, response))
{
    if (response->Capabilities)
    {
        //Media URI: response->Capabilities->Media->XAddr;
        //PTZ URI: response->Capabilities->PTZ->XAddr;
    }
}

获取Media Profile

获取Profile token可以获取对应的快照

_trt__GetProfiles* getProfiles = soap_new__trt__GetProfiles(proxyMedia, -1);
_trt__GetProfilesResponse* response = soap_new__trt__GetProfilesResponse(proxyMedia, -1);
if (SOAP_OK == proxyMedia->GetProfiles(getProfiles, response))
{
    int size = response->__sizeProfiles;
    for (int i = 0; i < size; ++i)
    {
        if (response->Profiles[i])
        {
            //Media Profile Token: response->Profiles[i]->token;
            //一般设备包含多个Profile Token，包含主码流、子码流、第三码流
        }
    }
}

获取快照访问地址

快照访问地址通常为HTTP地址，可以通过这个HTTP地址GET到快照文件

MediaBindingProxy* mediaProxy = new MediaBindingProxy;
  mediaProxy->soap_endpoint = mediaUrl.c_str();

  if (!security(mediaProxy, username, password))
  {
      delete mediaProxy;
      return result;
  }

  _trt__GetSnapshotUri* snap = soap_new__trt__GetSnapshotUri(mediaProxy, -1);
  _trt__GetSnapshotUriResponse* response = soap_new__trt__GetSnapshotUriResponse(mediaProxy, -1);
  snap->ProfileToken = const_cast<char*>(profile.c_str());

  if (SOAP_OK == mediaProxy->GetSnapshotUri(snap, response))
  {
      if (response->MediaUri && response->MediaUri->Uri)
      {
          //response->MediaUri->Uri
          //快照地址
      }
  }

  if (response)
      soap_delete__trt__GetSnapshotUriResponse(mediaProxy, response);

  if (snap)
      soap_delete__trt__GetSnapshotUri(mediaProxy, snap);

  return result;

关于LiveNVR

LiveNVR能够通过简单的网络摄像机通道配置，将传统监控行业里面的高清网络摄像机IP Camera、NVR等具有RTSP协议输出的设备接入到LiveNVR，LiveNVR能够将这些视频源的音视频数据进行拉取，转换为RTMP/HLS，进行全平台终端H5直播（Web、Android、iOS），并且LiveNVR能够将视频源的直播数据对接到第三方CDN网络，实现互联网级别的直播分发；

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