[linux-dvb] unique IDs for struct dvb_demux_feed

Johannes Stezenbach js at linuxtv.org
Mon Feb 14 19:18:51 CET 2005

Patrick Boettcher wrote:
> When rewriting the skystar2 driver I saw something, which maybe can be put 
> into an upper layer:
> Every driver, which's hardware supports PID filtering (in the demod or 
> anywhere else), implements a similar mechanism: They hold a table or a 
> static list with at least an unique ID, a pid value and an active-switch. 
> Each time the start_feed-callback is called they look for a free entry in 
> this list and reserve it until it is freed by the stop_feed-callback. The 
> unique ID can be understood as the position in the pid-filter-table of the 
> hardware, just incrementing the feed_count is of course not enough and ID 
> can be reused. For examples, see dvb-dibusb-pid, skystar2, ttusb-budget.
> The easiest solution would be to add a unique ID to struct dvb_demux_feed. 
> Some ugly code duplicates can then be removed.
> Please have a look at the attached patch. Does this small change in 
> dvb_demux.[ch] is sufficient, or did I miss anything?

I guess dvb_demux.[ch] was written with devices like the Nova cards
in mind. If your tiny patch lets us drop unnecessary code from
dvb-dibusb-pid, skystar2, ttusb-budget then it can't be wrong ;-)


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