[vlc-devel] Filters in libvlc

[jboileau]

> What I dont know and what I need to know, is when
> I have to restore applied filters? I suppose
> after changing media, but what about other cases?
> Maybe I overlooked it, has libvlc something to
> indicate new created vout?

The idea of a callback when a vout is created would certainly be
ideal. I don't know if it exist. Trying to do it on a case by case
basis will probably fail. I know at least one filter, the magnify
filter, that stops and restarts vout and thus kills filters not saved
in the config.

You do have 2 alternatives:

1. by some mechanism be informed that a new vout has been created and
restart filters
or
2. save the filter settings in the config since a new vout will read
and set filters as per the config.

I don't know if it would make us design the API differently but it is
important to design/name the new API with the idea of adding other
filters later. What I mean is: we must consider what this API might
look like if we add a bunch of other filters later on and if it will
be manageable. Just something to keep in mind while designing.

Jacques Boileau


On Fri, Jun 20, 2008 at 8:27 AM, Lukas Durfina <lukas.durfina at gmail.com> wrote:
> On Thu, 19 Jun 2008 16:24:16 +0200, jboileau <jboileau at gmail.com> wrote:
>
> Hi,
>
>> Fine idea by me. I do suggest you also consult with Pierre
>> d'Herbermont the libvlc guru! I am more a user than an architect of
>> the libvlc API. But of course my opinion does have some value. :-)
>
> I have a feeling, that Pierre is away for 2 weeks, so we can consultate
> then, but now it would be helpfull too.
>
>>
>> Yes and that's what Pierre had suggested. This approach is certainly
>> simpler, should work fine for libvlc and makes everything local to
>> libvlc. If you do
>> it in libvlc for now it could certainly be changed if ever the filter
>> API evolves and includes persistance one of these days anyways.
>
> I implemented it in libvlc, it isnt finished and tested now
> but I hope, it will be fine to work with it.
>
> What I dont know and what I need to know, is when
> I have to restore applied filters? I suppose
> after changing media, but what about other cases?
>
> Maybe I overlooked it, has libvlc something to
> indicate new created vout? Because for example
> after setting new video media, vout structure will
> be created after short moment...
>
> if someone wants to review and make comments:
> http://git.videolan.org/?p=vlc-lukas.git;a=commitdiff;h=52f95b42e349d1a39bb4e9e23e3f529fd54df5ee
>
>
> Lukas
>
>
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