IRB_REQ_ISOCH_LISTEN - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// 1394.h

typedef struct _IRB_REQ_ISOCH_LISTEN {
  HANDLE     hResource;
  ULONG      fulFlags;
  CYCLE_TIME StartTime;
} IRB_REQ_ISOCH_LISTEN;
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Windows Driver Kit DDI reference (ns-1394-_irb_req_isoch_listen)

_IRB_REQ_ISOCH_LISTEN structure

Description

This structure contains the fields necessary to carry out a ReqIsochListen request.

Members

hResource

Specifies the resource handle to use in reading data.

fulFlags

Reserved. Device drivers must set this to zero.

StartTime

Specifies the cycle time to begin reading data. This member is used only if the driver specified the RESOURCE_SYNCH_ON_TIME flag when it allocated the resource handle passed in u.IsochListen.hResource. (The timing resolution is per isochronous cycle, so the CycleOffset member of StartTime is not used.)

Remarks

The bus driver completes this request once it has successfully scheduled the isochronous listen operation. It does not wait for the data transfer to finish, or even begin, before it completes the request.

Listening on a channel may begin immediately, or it may be synchronized to an event. If the driver set the RESOURCE_SYNCH_ON_TIME flag on the REQUEST_ISOCH_ALLOCATE_RESOURCES request that returned the resource handle, then the listen begins on the cycle count specified in StartTime. Additional synchronization options may be set for each buffer within that buffer's ISOCH_DESCRIPTOR structure.

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