// 1394.h

typedef struct _IRB_REQ_ISOCH_QUERY_RESOURCES {
  ULONG         fulSpeed;
  ULONG         BytesPerFrameAvailable;
  LARGE_INTEGER ChannelsAvailable;
} IRB_REQ_ISOCH_QUERY_RESOURCES;
View the official Windows Driver Kit DDI reference

NtDoc

No description available.

Edit description on GitHub

Windows Driver Kit DDI reference (ns-1394-_irb_req_isoch_query_resources)

_IRB_REQ_ISOCH_QUERY_RESOURCES structure

Description

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

Members

`fulSpeed`

Specifies the speed flag to use in allocating bandwidth. The possible speed values are SPEED_FLAGS_xxx, where xxx is the approximate transfer rate in megabits per second. Existing hardware supports transfer rates of 100, 200, and 400 MBps.

Transfer Rate	Description
SPEED_FLAGS_100	100 Mb/s
SPEED_FLAGS_200	200 Mb/s
SPEED_FLAGS_400	400 Mb/s

`BytesPerFrameAvailable`

On success, specifies the returned available bandwidth as expressed in bytes per isochronous frame.

`ChannelsAvailable`

On success, points to a bitmap of available channels.

The highest order bit (bit 63) specifies channel 0, the next bit (bit 62) specifies channel 1, and so on.

View the official Windows Driver Kit DDI reference

Edit description on GitHub