https://community.nxp.com/t5/i-MX-Processors/imx8mp-DMA-memory-copy-for-gstreamer-userspace/m-p/1285310#M174805 <P>Hi,</P><P>Currently my video data is from 2 image sensor, line interleaved, and I have constructed a gstreamer plugin to deinterleave it using memcpy method, that costs cpu usage a lot, so I want to use DMA copy instead.</P><P>Is there exist a DMA memory copy for userspace usage?</P><P>Thanks.</P> Tue, 01 Jun 2021 09:37:00 GMT chris_liuv 2021-06-01T09:37:00Z https://community.nxp.com/t5/i-MX-Processors/imx8mp-DMA-memory-copy-for-gstreamer-userspace/m-p/1285310#M174805 <P>Hi,</P><P>Currently my video data is from 2 image sensor, line interleaved, and I have constructed a gstreamer plugin to deinterleave it using memcpy method, that costs cpu usage a lot, so I want to use DMA copy instead.</P><P>Is there exist a DMA memory copy for userspace usage?</P><P>Thanks.</P> Tue, 01 Jun 2021 09:37:00 GMT https://community.nxp.com/t5/i-MX-Processors/imx8mp-DMA-memory-copy-for-gstreamer-userspace/m-p/1285310#M174805 chris_liuv 2021-06-01T09:37:00Z https://community.nxp.com/t5/i-MX-Processors/imx8mp-DMA-memory-copy-for-gstreamer-userspace/m-p/1288911#M175164 <P>one can try the dmabuf to save cpu performance,</P> <P>The dmabuf uses buffers of a hardware DMA in order to perform a zero-copy pipeline, as shown below:<BR />$ gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=300 io-mode=dmabuf ! \<BR />'video/x-raw,format=(string)NV12,width=1920,height=1080,framerate=(fraction)30/1' ! \<BR />queue ! v4l2h264enc output-io-mode=dmabuf-import ! avimux ! filesink location=test.avi</P> <P><BR />In this pipeline, the RAW format is stored by the io-mode property and then used further on the<BR />H.264 format encode process.</P> Tue, 08 Jun 2021 08:25:28 GMT https://community.nxp.com/t5/i-MX-Processors/imx8mp-DMA-memory-copy-for-gstreamer-userspace/m-p/1288911#M175164 joanxie 2021-06-08T08:25:28Z