Understanding GLBuffer and appsink

[Matthew Waters]

Hi,

The answer is it depends on your pipeline :)

If your appsink is receiving caps with video/x-raw(memory:GLMemory),
then appsink is receiving OpenGL textures.  OpenGL textures are only
mapped to the CPU when mapped with gst_memory_map() and friends without
the GST_MAP_GL map flag.

Cheers
-Matt

On 9/6/20 12:49 am, Avishay Orpaz wrote:
> Hi
> I have a pipeline in which an nvdec element feeds an appsink element.
> The nvdec element does its data processing on the GPU and emits
> GLBuffers. Downstream, I only need a fraction of the frames decoded by
> the GPU, so I don't want them to be copied into the CPU memory at all.
> How do I accomplish this? Are the buffers received by appsink GL or
> CPU buffers? What is the exact point the buffers get copied from the
> GPU into the CPU?
>
> Avishay
>
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> gstreamer-devel at lists.freedesktop.org
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