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8127中CaptureDisplay Demo的link初始化问题

comeback
Expert 1795 points


Hi，

我用的是IPNC RDK 3.0。在文件multich_Stream_CaptureDisplay.c中，看到如下代码片段：

	ipcFramesInHostPrm.baseCreateParams.noNotifyMode = TRUE;
	ipcFramesInHostPrm.baseCreateParams.notifyNextLink = FALSE;
	ipcFramesInHostPrm.baseCreateParams.notifyPrevLink = FALSE;
	ipcFramesInHostPrm.baseCreateParams.inQueParams.prevLinkId = gVcamModuleContext.ipcFramesOutVpssToHostId;
	ipcFramesInHostPrm.baseCreateParams.inQueParams.prevLinkQueId = 0;
	ipcFramesInHostPrm.baseCreateParams.outQueParams[0].nextLink = SYSTEM_LINK_ID_INVALID;
	ipcFramesInHostPrm.exportOnlyPhyAddr = TRUE;

	ipcFramesInHostPrm.cbCtx = &gVcamModuleContext;
	ipcFramesInHostPrm.cbFxn = Vcam_ipcFramesInCbFxn;

	ipcFramesOutHostPrm.baseCreateParams.noNotifyMode = TRUE;
	ipcFramesOutHostPrm.baseCreateParams.notifyNextLink = FALSE;
	ipcFramesOutHostPrm.baseCreateParams.notifyPrevLink = FALSE;
	ipcFramesOutHostPrm.baseCreateParams.inQueParams.prevLinkId = SYSTEM_LINK_ID_INVALID;
	ipcFramesOutHostPrm.baseCreateParams.inQueParams.prevLinkQueId = 0;
	ipcFramesOutHostPrm.baseCreateParams.outQueParams[0].nextLink = gVdisModuleContext.ipcFramesInVpssFromHostId;

我对于ipcFramesInHostPrm的nextLink和ipcFramesOutHostPrm的preLinkId设置成SYSTEM_LINK_ID_INVALID不能理解。在我看来，ipcFrameInHost和ipcFrameOutHost应该互为前后link。到底该如何理解呢？