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vaapi: decoder: modify the condition to judge whether dma buffer is supported

yuankun zhang requested to merge zhangyuankun/gstreamer-vaapi:decode_dma_buf into master

It seems "GST_VAAPI_PLUGIN_BASE_SRC_PAD_CAN_DMABUF (decode)" will return false even if this platform support the mem_type dma buffer. And media-driver will return GST_VAAPI_BUFFER_MEMORY_TYPE_DMA_BUF2 on Gen12(such as TGL). Without this patch, The command such as: gst-launch-1.0 videotestsrc num-buffers=100 ! video/x-raw, format=I420 !
x264enc ! h264parse ! vaapih264dec ! video/x-raw(memory:DMABuf) ! fakesink will return not-negotiated.

Signed-off-by: Zhang Yuankun yuankunx.zhang@intel.com

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