[pvrusb2] Channel-change script
isely at isely.net
Wed Sep 14 11:52:47 CDT 2005
On Wed, 14 Sep 2005, Per Christian Henden wrote:
> On Sunday 11 September 2005 01:42, Per Christian Henden wrote:
> > On Sunday 11 September 2005 01:14, Mike Isely wrote:
> > > With your permission I will add this to the pvrusb2 driver snapshot.
> > Sure, go ahead.
Sorry, this didn't get into the 20050911 snapshot in time. But I'll have
it in the next one.
> > I don't notice any difference in speed or anything when changing
> > channels by setting the frequency in ctl_freq_table_value
> > and by programming in the table and using ctl_channel.
> > Is there a difference in what code gets executed by the driver?
> To answer this myself:
> It seems that there sometimes is a difference, not sure under what conditions,
> but audio from the previous channel plays for a little while when changing
> channels by changing the frequency directly, i.e., when not using the
> ctl_channel control.
> So a script/program for changing channels should use the ctl_channel control.
The frequency table logic operates just by doing a lookup and changing the
frequency ultimately the same way. There should be no difference except
maybe a few hundred extra CPU cycles spent to do the table lookup and
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