IRB_REQ_ISOCH_ALLOCATE_CHANNEL - NtDoc

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

typedef struct _IRB_REQ_ISOCH_ALLOCATE_CHANNEL {
  ULONG         nRequestedChannel;
  ULONG         Channel;
  LARGE_INTEGER ChannelsAvailable;
} IRB_REQ_ISOCH_ALLOCATE_CHANNEL;
View the official Windows Driver Kit DDI reference

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

_IRB_REQ_ISOCH_ALLOCATE_CHANNEL structure

Description

This structure contains the fields necessary in order for the 1394 bus driver to carry out an IsochAllocateChannel request.

Members

nRequestedChannel

Specifies the particular channel to allocate, or ISOCH_ANY_CHANNEL for an arbitrary channel.

Channel

Specifies the channel allocated, if the request succeeds.

ChannelsAvailable

A bitmap specifying the available channels. The highest order bit (bit 63) specifies channel 0, the next bit (bit 62) specifies channel 1, and so on.

Note Drivers should not rely on this information because another device may allocate or deallocate channels at any time. The bus driver fills in this member, even if the request fails.

View the official Windows Driver Kit DDI reference

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