Fail to mmap the capture_plane of decoder in MMAPI

zcs · July 24, 2017, 8:40am

Hi, I try to mmap the capture_plane of decoder, but it return error.

I have modifed “00_video_decode” to reproduce this issue.

ret = dec->capture_plane.setupPlane(V4L2_MEMORY_MMAP, min_dec_capture_buffers+ 5, true, false);

then it failed and print “Error in decoder capture plane setup”

Is there any advice?

DaneLLL · July 28, 2017, 1:59am

Hi zcs, please share the purpose of the change.

zcs · July 31, 2017, 6:27am

Hi, DaneLLL

I want to map capture plane buffer of decoder to modify YUV data.

DaneLLL · July 31, 2017, 7:42am

Please try new APIs in r28.1
NvBufferMemMap
NvBufferMemUnMap

zcs · August 1, 2017, 11:15am

Hi DaneLLL,

Thank you for your reply. I will try it.

What is the difference between NvBufferMemMap and mmap?

DaneLLL · August 2, 2017, 1:32am

Not sure how mmap is implemented. NvBufferMemMap is new APIs to fix off-sync issues on r24.2.1