Re: AVStream Device - Isochronous or Bulk

Hi Tim,

Thanks for your reply. But in the event that my device supports both bulk
and isochronous, is there a way to switch between the different endpoints?

"Tim Roberts" wrote:

> "DoorKeeper" <DoorKeeper@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> >
> >I am new to developing applications for AVStream-based devices and currently
> >I'm trying to display video over a usb device. I understand that we can use
> >MS's usbvideo.sys for this purpose but how do we know if we are transferring
> >the data over the isochronous or the bulk endpt and is there a way to choose
> >either one? Thanks.
>
> You use whatever your device supports. Your device reports the endpoint
> type in its descriptors, and the driver uses it to do the transfers.
>
> Video capture commonly uses an isochronous pipe, because the timing is
> critical and must be driven by the device. Thus, the guaranteed bandwidth
> is important. For video display, you'll have to decide which one makes
> sense.
> --
> - Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.
>
.

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