[linux-dvb] Re: streaming video over USB?

[Patrick Boettcher <patrick.boettcher@desy.de>]

On Tue, 18 May 2004, Craig Procter wrote:
> Is the video packetized by the USB device or is it sent in a constant
> stream which the software on the PC then 'grabs' and decodes/shows on
> screen?

Hi Craig,

For Twinhan VP7041 the dvb data is directly streamed to the software, and
the software does the rest (So no special repackaging by the device).

> Is there a 'universal' way which has been adopted for streaming
> USB video or does each manufacturer have their own way of doing things?

Since the USB devices have different endpoint types (e.g. Hauppauge dec-t
has isochronous EPs for data (Alex, correct me if I'm wrong), VP7041 has
only bulk endpoints for everything) and so different access method, I'm
not sure if a abstact usb driver is useful.

> (ie: software has to be tailored to each different USB video device).

No, in Linux the driver build an abstract framework for the applications,
this could be possible in Windows as well, but I don't know.

best regards,
Patrick


-- 
Info:
To unsubscribe send a mail to ecartis@linuxtv.org with "unsubscribe linux-dvb" as subject.