Fast copy between hardware buffers

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

How I can access DMA (Direct Memory Access) controllers on TX1 to schedule copy of large data (like raw video data) from one hardware buffer to another? I am currently taking doing memcpy() which works but takes huge time.

2

Hi SagarGaonkar,

What’s your use case? Between internal CPU and GPU or through PCIE bridge to external hardware?
Please provide more information, then people can share their experience.

Thanks

3

My use case is copying buffers from various hardware components like V4L2 Video Converter and Video encoder. I need this copy because the output of V4L2 Video Converter does not match what encoder expects because its stride != width and it has different strides for Chroma and Luma parts of video buffers.

Other use case is to compose 2 or more video inputs into a single buffer before encode.

4

Hi Sagar,
Do you integrate [07_video_convert->01_video_encode] and find it not working? Please share how to reproduce the issue on r24.2.1.

In gstreamer frameworks, it is working [gst-launch-1.0 videotestsrc num-buffers=100 is-live=true ! nvvidconv ! omxh264enc ! fakesink].

5

Hi Sagar,

Have you resolved the issue by previous suggestion?
Any result can be shared?

Thanks