[Gstreamer-openmax] Support for hardware codecs

[Clark, Rob]

On Apr 1, 2009, at 11:21 AM, Felipe Contreras wrote:

> On Wed, Apr 1, 2009 at 6:45 PM, Stephen M. Webb <stephenw at xandros.com> wrote:
>> On 01/04/09 11:15, Felipe Contreras wrote:
>>> 
>>> Yeah, that's the next step, I plan to implement something like:
>>> ./configure MAPPING=maemo
>>> 
>>> Would that fit your use case?
>> 
>> No, configuring at compile time won't help, I need to configure at runtime.  I
>> want to be able to distribute a single gstreamer-openmax library binary
>> package for, say, Cortex-A8 and be able to configure it at runtime (well,
>> install time) for the actual hardware it's running on, say OMAP3, i.MX51, or
>> QSD8x50.  Just for example.
>> 
>>> I am planning to do that soon, but of course I would not get mad if
>>> you beat me to it :)
>> 
>> I was hoping you'd say you were just about to check in the changes.  I will
>> now frown and grumble and see what I can come up with.
> 
> Ah, I see.
> 
> Well, there's definitely plans on that, but it's pretty low on my
> priority list =/
> 
> My idea was to create a gst-openmax registry, with this API:
> http://bugzilla.gnome.org/show_bug.cgi?id=350477


I was starting to think again about gst-openmax registry..

On implementation side, what are your thoughts about using libxml2?  It seems a bit overkill, but it is already a dependency of gstreamer core.

On requirements side, do you think any of following are needed:

 * Detect changes in registry at runtime?  Or just check if file has changed at plugin_init() time?
 * Dynamic class instances..  Ie. be able to introduce new OMX components without creating a new GstOmx subclass?  (Hypothetically you could put template caps and compression format in registry..  although I think it would be only extremelly simple cases where you could avoid writing any code.)
 * multiple different OMX components filling same role?  (Ie. different MP3 decoder components.)  Again, I don't really see immediately how this could work, but I'm just brainstorming here.


Anything else?


BR,
-R