Generic transfer scheme for outputting video frame in Ultra-HD video Engine

Typically, industry video solutions does in-loop filtering on-the-fly (e.g. at Macro Block for H.264 or Coding Unit level for HEVC) and transfer YUV data to external memory using DMA engine. These transfers are un-aligned with processing unit (MB/CU) as well as variable sized due to loop filtering operation. This poses challenges in Loop filer and DMA engine on handling of such transfers. This paper proposes concept of “region” to handle such transfers for H.264 and previous generation standard. In case of H.264, the paper proposes division of video frame in to nine regions with common transfer attributes. In case of HEVC, there is additional complexity of TILES (with & without loop filtering) which creates variable numbers of regions in output frame. This paper also proposed flexible & generic scheme to handle output YUV transfers for handling of TILES in HEVC. The updated scheme is flexible enough to encompass previous generation of video standard e.g. H.264 with better performance.