Understanding GLBuffer and appsink

[Avishay Orpaz]

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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[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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