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Abstract

A system and method for decoding an MPEG video bitstream comprises, comprising a macroblock core (MBCORE) which processes video bitstream data and computes discrete cosine transform data and a parser which parses the video bitstream macroblocks into multiple data blocks used in subsequent stages of decoding. fixed length data words comprising variable length objects using a novel rotating register arrangement. A multistage transformation/motion compensation core (TMCCORE) uses intermediate memory. The IDCT first stage has the ability to operate on a first data block while the second stage simultaneously operates on a second data block. The TMCCORE receives the discrete cosine transform data from the MBCORE and calculates and reconstructs a frame therefrom using motion compensation. The MBCORE can operate on data from a first macroblock while the TMCCORE simultaneously operates on data from a second macroblock. The TMCCORE reconstructs the picture from one macroblock while the IDCT first and second stages simultaneously operate on data from the macroblock. Additionally, a horizontal and vertical half pixel compensation arrangement is included which has multiple adders and multiplexers.

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First Claim