Hi Mr.Ferguson,
Thanks,I get it.
But I have another problem.That is,
As you know,On application layer when we start
isoch reading we should create an event source
and add it to current RunLoop. When event comes
our callback function will be invoked.Is it the same
in KEXT. If not, then how to do it.
Thanks & Best regards.
Vimicro Corporation
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Message: 3
Date: Mon, 10 Oct 2005 08:16:08 -0700
From: David Ferguson <email@hidden>
Subject: Re: How to issue usb isoch request in KEXT?
To: email@hidden
Message-ID: <p0602040ebf70358f649b@[17.206.37.158]>
Content-Type: text/plain; charset="us-ascii"
At 5:27 PM +0800 10/10/05, Gordon wrote:
>Hi all,
> I met a problem that I can't issue usb isoch request in KEXT.
>That is, the way issue isoch request is :
> result = fIsoPipe->Read(fIsoMDP, frameStart, MAX_FRAME, frameList,
>&completion);
>IOUSBIsocPipe* fIsoPipe
>IOMemoryDescriptor* fIsoMDP
>UInt64 frameStart //bus frame number
>... ...
>The problem is How can I get the bus frame number in KEXT
>
Try something like this:
frameStart = fOwner->GetDevice()->GetBus()->GetFrameNumber();
of course you will probably want to start at some frame in the
future, so add 1 or 2 frames to that number.
David Ferguson
USB Software Team
Apple Computer
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