Linux/AM5728: Best way to make zero copy video pipe

Oleg Ostap

Part Number: AM5728

Tool/software: Linux

I have AM5728 board with great list capabilities: OpenCL, VPE, OpenGL and would love to built video pipe with zero copy approach for following pipe(s):

V4L2->VPE->(OpenCL, OpenGL)->VPE

V4L2->(OpenCL, OpenGL)->VPE

V4L2->VPE->OpenGL->OpenCL->VPE

Pixel format: flavors of YUV: YUYV,I420,I422,NV12 or compressed MJPEG/H264...

What would be the best way to make zero copy connections between following libraries?

1. V4L2->VPE/OpenGL/OpenCL

2. VPE->OpenGL/OpenCL

3. OpenGL/OpenCL->VPE

Thanks

over 7 years ago

0 Yordan Kovachev over 7 years ago

TI__Guru**** 161600 points

Hi Oleg,

You could try to use shared memory buffers between OpenCL & OpenGL this way both frameworks could access the resources. See:
www.khronos.org/.../cl_khr_gl_sharing.html

Best Regards,
Yordan

0 Oleg Ostap over 7 years ago in reply to Yordan Kovachev

Intellectual 260 points

Thank you for answer.

I'm afraid OpenCL on AM5728 does not support that extension. There is list of extensions supported

OpenCL extensions:

cl_khr_byte_addressable_store
cl_khr_global_int32_base_atomics
cl_khr_global_int32_extended_atomics
cl_khr_local_int32_base_atomics
cl_khr_local_int32_extended_atomics
cl_ti_msmc_buffers
cl_ti_clmalloc

Is your list different? Do you have it supported?

0 BO over 7 years ago in reply to Oleg Ostap

TI__Genius 12760 points

Oleg,
is here a feedback pending?

Regards,
Bernd

0 Oleg Ostap over 7 years ago in reply to BO

Intellectual 260 points

The answer does not apply to AM5228.

0 Manisha Agrawal over 7 years ago

TI__Mastermind 22386 points

What's the reference to OpenGL/OpenCL here? If it's for SGX, openCL isn't supported on SGX.

For rest, VPE and SGX driver supports dmabuf export/import and hence can do zero copy operation.

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Linux/AM5728: Best way to make zero copy video pipe