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Modifying a coded bitstream

  • US 8,358,703 B2
  • Filed: 11/02/2007
  • Issued: 01/22/2013
  • Est. Priority Date: 03/23/2007
  • Status: Active Grant
First Claim
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1. A method comprising:

  • accessing, without initially decoding, arithmetically encoded data, the arithmetically encoded data comprising data encoded with an arithmetic code, and the encoded data including at least a first coded portion and a second coded portion, wherein the first and second coded portions have been coded with a code having memory, such that decoding the second coded portion relies on an output from decoding the first coded portion;

    and determining a modified first arithmetically coded portion such that the second coded portion is decodable to produce a common result based on either an output from decoding the first coded portion or an output from decoding the modified first arithmetically coded portion, wherein determining comprises determining a modified first arithmetically coded portion that generates a Context-based Adaptive Binary Arithmetic Coding (CABAC) state value that is the same as a CABAC state value generated by the first coded portion.

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