[mythtv] New plugin scheme / Filter selection interface?

Joseph A. Caputo jcaputo1 at comcast.net
Tue Feb 3 12:19:47 EST 2004


On Friday 30 January 2004 19:46, Andrew Mahone wrote:
> On Fri, 30 Jan 2004 13:02:17 -0500, "Joseph A. Caputo"
> <jcaputo1 at comcast.net> said:
> > Cool, I'll have a look at it.
> >
> > -JAC
> 
> The filters README should have everything you need for this, but if I
> missed anything in there, just ask.  It's a pretty simple interface,
> the FilterManager class has a method that provides a list of
> FilterInfo structs.
> 
> Keep in mind also that it may not simply be a matter of
> enabling/disabling filters and specifying an order for them.  It is
> perfectly valid to have multiple instances of a filter in the filter
> chain, so we need something along the lines of being able to select
> any available filter, add parameters to it, and insert it into the
> filter chain.
> 
> As far as a GUI for parameters, I'd like to come up with a reasonably
> flexible standard way for filters to describe their options.  I think
> most options could be handled by the following types:
> 
> boolean: GUI would display as checkbox
> 
> integer: filter provides valid range, GUI would display a slider
> or a spinbox
> 
> float: filter provides valid range, GUI would display as slider
> 
> enum: filter provides a list of string values, GUI would display
> as combobox
> 
> A default value should also be provided for each option, and the GUI
> should display a "reset to default" button.  Any thought on the best way
> to describe these?  I'd like something compact that can get stuffed into
> a string in the FilterInfo structure.  I think the GUI could be set up to
> create colon-delimited lists of options, as used by many filters already.
> I could set up some convenience macros for parsing such lists in
> filter.h, although it shouldn't really be necessary.  I'm guessing from
> the way that video codec options seem to work that building a GUI from a
> list of options as described above shouldn't be too hard, right?


Just thought I'd give an update... I'm building a new Myth box, so I'm a bit 
short on time.  The new box will have HW MPEG encoders and use XvMC on its 
output, which makes anything filter-related rather low-priority for me... 
anybody else interested in picking this up?

-JAC



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