Tech Support > Microsoft Windows > Drivers > 1394 iso recv buffer size integral number of bytes per packet?
1394 iso recv buffer size integral number of bytes per packet?
Posted by Volker Moebius on September 15th, 2003


Hi all,

excuse me if resubmitting a known issue. But after scanning this news group as well as some others I
found some hints confirming that buffers provided for isochronous listening in stream mode must be
sized of integral number of 1394 packet size. And unfortunately my own tests endorse this
assumption.

I found no statements referring to this in DDK documentation nor in 1394 OHCI spec.

Can anybody acknowledge (or rebut) this issue please?

Is there an easy way to receive a 1394 multi packet frame not integral number of packet size sized?
Possibly by providing two buffers meeting the above requirement together one receiving the user data
the other gathering the junk trailer?

Thanks
Volker


Posted by Raj on September 15th, 2003


I observed in Win2000, the byte number should be multiple of 4.
Need not be integral number of packet size.


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