FW: GL upload and GL download design

[Bing Song-2]

Hi,

 

Currently many GL upload methods implement in gst-libs/gst/gl/gstglupload.c. We need change the file if we want to implement one special GL upload method. Is it possible to implement one GL upload method in one element? glupload will be one GStreamer bin. The bin will find all GL upload elements in the system and select one best GL upload method based on rank. So every vendor can implement their own GL upload method and needn't modify gst-libs/gst/gl/gstglupload.c. GL download also has same problem. What's your option?

 

Regards,

Song Bing.

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[Sebastian Dröge-3]

On Mo, 2016-05-23 at 01:44 +0000, Bing Song wrote:

> Hi,
>  
> Currently many GL upload methods implement in gst-
> libs/gst/gl/gstglupload.c. We need change the file if we want to
> implement one special GL upload method. Is it possible to implement
> one GL upload method in one element? glupload will be one GStreamer
> bin. The bin will find all GL upload elements in the system and
> select one best GL upload method based on rank. So every vendor can
> implement their own GL upload method and needn't modify gst-
> libs/gst/gl/gstglupload.c. GL download also has same problem. What's
> your option?

The code in there is not really an element but functions that are used
inside GstGLMemory for handling upload/download/etc of video frames in
various formats.

What you probably want is an extension mechanism for the upload
methods, basically what the UploadMethod does. As you can see, this is
at a much lower level than elements.


What are the reasons why you can't add your custom upload method to
libgstgl directly? GStreamer and libgstgl will have to be compiled
specifically for different embedded platforms anyway, and it would
probably be not a problem to have your code integrated directly into
libgstgl upstream and have it automatically enabled/disabled based on
the configure script.

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com


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[Nicolas Dufresne-4]

Le lundi 23 mai 2016 à 01:44 +0000, Bing Song a écrit :
> Currently many GL upload methods implement in gst-
> libs/gst/gl/gstglupload.c. We need change the file if we want to
> implement one special GL upload method. Is it possible to implement
> one GL upload method in one element? glupload will be one GStreamer
> bin. The bin will find all GL upload elements in the system and
> select one best GL upload method based on rank. So every vendor can
> implement their own GL upload method and needn't modify gst-
> libs/gst/gl/gstglupload.c. GL download also has same problem. What's
> your option?

My opinion is that vendor should find a way to provide DMABuf which can
now be imported by glupload element. This is what is provided by most
V4L2 driver (camera and codec), this will be the backend for
gralloc/ion on Android (already in mainline I believe). This is also
where VAAPI is heading.

cheers,
Nicolas 
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