[gst-devel] glupload, glimagesink openGL question

[Julien Isorce]

2009/8/26 Miquel Àngel Farré <miquel.farre at gmail.com>

> Hi Tristan,
>
> It is not in the same thread, so I will use the appsink as you said.

But this is the same process right ?

>
>
> The problem is that I want to draw the ouput of mpeg2dec, it is yuv-raw, I
> wonder if it is possible to convert it to rgb to make it easier generate a
> texture.
>
> Thanks for your contribution,
>
> Miquel
>
> 2009/8/26 Tristan Matthews <tristan at sat.qc.ca>
>
> Hi,
>>
>> Florent wrote:
>> >> I would like to obtain video from a stream and send it to my openGL
>> based
>> >> application, and draw the frames there.
>> >>
>> Would your application be in the same process as your gstreamer
>> pipeline? If not, you won't be able to share gl contexts if you're using
>> direct rendering. From
>> http://www.opengl.org/sdk/docs/man/xhtml/glXCreateNewContext.xml:
>>
>>            .... direct-rendering contexts cannot be shared outside a
>> single process,
>>            and they may be unable to render to GLX pixmaps.
>>
>> If you don't want it in the same process, you could use appsink, pass
>> the buffers to some shared memory and in your GL process upload these
>> buffers to GL textures.
>>
>> Sorry if this is an aside, I've been working on something similar so I
>> thought I would pass the information along.
>>
>> Best,
>>
>> Tristan
>>
>> >> My idea is use glupload to obtain openGL textures and then load these
>> into
>> >> the application through appsink.
>> >>
>> >
>> > You won't need any gl-based stuff if you use appsink, because it will
>> > pass raw buffers in memory.
>> >
>> >
>> >> * Question: there is a better way to pass the textures to my app
>> instead of
>> >> appsink ?
>> >>
>> >
>> > You can, however share the openGL context between glimagesink and your
>> > application so that you don't need to upload frames manually. See
>> > tests/examples/clutter/cluttershare as example.
>> >
>> >
>> >>  * Question: what glupload ! glimagesink do?
>> >>
>> >
>> > glimagesink uses glupload internally, so you don't need it for using
>> > glimagesink. You need glupload only if you want to filter the frames
>> > using opengl (ex: glupload ! gleffects effect=2 ! glimagesink)
>> >
>> > Florent
>> >
>> >
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>>
>>
>> --
>> Tristan Matthews
>> Société des arts technologiques [SAT]
>> email: tristan at sat.qc.ca
>> web: http://www.music.mcgill.ca/~tmatthews<http://www.music.mcgill.ca/%7Etmatthews>
>>
>>
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