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msdkdec: Decoder should use its own pool when downstream allocator is not recognizable

Mengkejiergeli Ba requested to merge mkba/gstreamer:msdkdec_accept_other_enc into main

Msdkdec should use it own pool when the allocation from downstream query is not any msdk_allocator (i.e. msdk_video_allocator, msdk_dmabuf_allocator and msdk_system_allocator). Otherwise, when using pipeline "msdkh264dec ! vah264enc !" to transcode a not 16-bit-aligned stream (i.e. 1920x1080), the transcoding will fail due to the size mismatch issue between decoder pool and encoder pool.

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