使用Onvif协议进行设备PTZ云台控制

接上一篇

使用Onvif协议最重要的应用就是对设备进行PTZ云台控制，PTZ控制包含转动、变焦等，这里我们主要讨论常用的转动和变焦(也就是放大缩小)

流程

要进行设备PTZ控制，我们首先需要获取到设备的Device Service Address和此设备的用户名密码

前两个流程和获取流地址一样

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，使用这两个URL可以进行流和PTZ操作，这里如果PTZ URI获取不到意味着这个设备无法支持PTZ控制

_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

使用上一步获取到的Media URI获取设备的Media Profile

_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
		}
	}
}

PTZ控制

使用获取的Media URI和Media Profile Token进行PTZ控制

PTZ控制，这里只考虑ContinuousMove，需要在停止的时候发送停止命令

_tptz__ContinuousMove* continuousMove = soap_new__tptz__ContinuousMove(ptzProxy, -1);
_tptz__ContinuousMoveResponse* response = soap_new__tptz__ContinuousMoveResponse(ptzProxy, -1);
continuousMove->ProfileToken = const_cast(profile.c_str());
tt__PTZSpeed* velocity = soap_new_tt__PTZSpeed(ptzProxy, -1);
continuousMove->Velocity = velocity;
tt__Vector2D* panTilt = soap_new_tt__Vector2D(ptzProxy, -1);
continuousMove->Velocity->PanTilt = panTilt;
continuousMove->Velocity->PanTilt->space = "http://www.onvif.org/ver10/tptz/PanTiltSpaces/VelocityGenericSpace";
tt__Vector1D* zoom = soap_new_tt__Vector1D(ptzProxy, -1);
continuousMove->Velocity->Zoom = zoom;
switch (command)
{
case LEFT:
	continuousMove->Velocity->PanTilt->x = -((float)speed / 10);
	continuousMove->Velocity->PanTilt->y = 0;
	break;
case RIGHT:
	continuousMove->Velocity->PanTilt->x = ((float)speed / 10);
	continuousMove->Velocity->PanTilt->y = 0;
	break;
case UP:
	continuousMove->Velocity->PanTilt->x = 0;
	continuousMove->Velocity->PanTilt->y = ((float)speed / 10);
	break;
case DOWN:
	continuousMove->Velocity->PanTilt->x = 0;
	continuousMove->Velocity->PanTilt->y = -((float)speed / 10);
	break;
case ZOOMIN:
	continuousMove->Velocity->Zoom->x = ((float)speed / 10);
	break;
case ZOOMOUT:
	continuousMove->Velocity->Zoom->x = -((float)speed / 10);
	break;
default:
	break;
}

if (ptzProxy->ContinuousMove(continuousMove, response) == SOAP_OK)
	//转动成功

停止PTZ控制

_tptz__Stop* stop = soap_new__tptz__Stop(ptzProxy, -1);
_tptz__StopResponse* response = soap_new__tptz__StopResponse(ptzProxy, -1);
stop->ProfileToken = const_cast(profile.c_str());

bool* pantilt = new bool;
stop->PanTilt = pantilt;
*(stop->PanTilt) = true;
bool* zoom = new bool;
stop->Zoom = zoom;
*(stop->Zoom) = true;

if (SOAP_OK == ptzProxy->Stop(stop, response))
	//停止成功