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WIP: DMA improvement

He Junyan requested to merge He_Junyan/gstreamer-vaapi:DMA_improve into master

Improve the DMA to a generic usage, such as

gst-launch-1.0 -v filesrc location=264.bits ! h264parse ! vaapih264dec ! video/x-raw(memory:DMABuf) ! vaapipostproc ! video/x-raw(memory:DMABuf) ! vaapih265enc ! filesink location=1.265

Also use the new API of vaExportSurfaceHandle() to replace the old manner.

Edited by He Junyan

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