// 1394.h

typedef struct _IRB_REQ_ISOCH_FREE_BANDWIDTH {
  HANDLE hBandwidth;
  ULONG  nMaxBytesPerFrameRequested;
  ULONG  fulSpeed;
  ULONG  BytesPerFrameAvailable;
  ULONG  SpeedSelected;
  ULONG  nBandwidthUnitsRequired;
} IRB_REQ_ISOCH_FREE_BANDWIDTH;
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Windows Driver Kit DDI reference (ns-1394-_irb_req_isoch_free_bandwidth)

_IRB_REQ_ISOCH_FREE_BANDWIDTH structure

Description

This structure contains the fields necessary in order for the Bus driver to carry out an IsochFreeBandwidth request.

Members

`hBandwidth`

Specifies the bandwidth handle to release.

`nMaxBytesPerFrameRequested`

`fulSpeed`

`BytesPerFrameAvailable`

`SpeedSelected`

`nBandwidthUnitsRequired`

Remarks

If successful, the bus driver sets Irp->IoStatus.Status to STATUS_SUCCESS, and the isochronous bandwidth is returned to the pool of available bandwidth.

A status of STATUS_INVALID_GENERATION also indicates success.

Do not resend the REQUEST_ISOCH_FREE_BANDWIDTH request in order to release isochronous bandwidth if the request failed with the STATUS_INVALID_GENERATION error code. In that case, it is safe to assume that isochronous bandwidth was released as a result of 1394 bus generation changes.

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