IRB_REQ_ISOCH_TALK - NtDoc

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

typedef struct _IRB_REQ_ISOCH_TALK {
  HANDLE     hResource;
  ULONG      fulFlags;
  CYCLE_TIME StartTime;
} IRB_REQ_ISOCH_TALK;
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Windows Driver Kit DDI reference (ns-1394-_irb_req_isoch_talk)

_IRB_REQ_ISOCH_TALK structure

Description

This structure contains the field necessary to carry out a IsochTalk request.

Members

hResource

Specifies the resource handle to use for this operation. Resources are acquired through the REQUEST_ISOCH_ALLOCATE_RESOURCES request.

fulFlags

Reserved. Drivers should set this to zero.

StartTime

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

Remarks

Talking 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 write operation begins on the specified cycle count. Additional synchronization options can be set for each buffer in the ISOCH_DESCRIPTOR structure.

If successful, the request returns a STATUS_SUCCESS value. The call returns immediately, and does not wait for any synchronization events. The bus driver calls the callback the driver provides in ISOCH_DESCRIPTOR to signal that it has finished processing an attached buffer.

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