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MPEG decoding system including tag list for associating presentation time stamps with encoded data units

  • US 5,559,999 A
  • Filed: 09/09/1994
  • Issued: 09/24/1996
  • Est. Priority Date: 09/09/1994
  • Status: Expired due to Term
First Claim
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1. A decoding system for decoding a data stream:

  • the data stream comprising;

    an encoded data unit;

    a header corresponding to said encoded data unit; and

    a time stamp included in said header for indicating a requested decoding time for said encoded data unit;

    the system comprising;

    a header memory;

    a data memory;

    a list memory;

    parsing means for parsing said data stream, storing said header in the header memory, storing said encoded data unit in the data memory beginning at a starting address and capturing said time stamp;

    computing means responsive to said parsing by the parsing means for storing said time stamp and said starting address as a list entry in said list memory; and

    decoding means for reading and decoding said encoded data unit from the data memory at an actual decoding time which can differ from said requested decoding time to produce a decoded data unit;

    the computing means being further responsive to said reading and decoding by the decoding means for accessing said list entry in the list memory using said starting address to obtain said time stamp;

    wherein the relationship between said requested decoding time and said actual decoding time can be utilized to synchronize subsequent presentation of said decoded data unit.

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