[gst-devel] glupload, glimagesink openGL question

[Miquel Àngel Farré]

Yes, the same process

2009/8/26 Julien Isorce <julien.isorce at gmail.com>

>
>
> 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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>>
>>
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