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Computing collocated macroblock information for direct mode macroblocks

  • US 8,254,455 B2
  • Filed: 06/30/2007
  • Issued: 08/28/2012
  • Est. Priority Date: 06/30/2007
  • Status: Active Grant
First Claim
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1. In a computing device that implements a video decoder, a method comprising:

  • with the computing device that implements the video decoder;

    identifying a B slice for a first picture;

    computing slice-level collocated macroblock information to be used for direct mode macroblocks in the B slice, and, for each of one or more collocated slices, remapping plural reference picture indices from a reference picture list of the collocated slice to a reference picture list of the B slice;

    for each of two or more of the direct mode macroblocks in the B slice;

    identifying the direct mode macroblock; and

    in response to the identifying, computing macroblock-level collocated macroblock information to be used in decoding of the direct mode macroblock; and

    using the slice-level collocated macroblock information and the macroblock-level collocated macroblock information in reconstruction of the respective direct mode macroblocks.

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