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Text subtitle decoder and method for decoding text subtitle streams

  • US 7,561,780 B2
  • Filed: 12/17/2004
  • Issued: 07/14/2009
  • Est. Priority Date: 02/10/2004
  • Status: Expired due to Fees
First Claim
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1. A method for decoding a text subtitle stream recorded on a recording medium, the method comprising:

  • loading the text subtitle stream into a subtitle loading buffer, the text subtitle stream including a style segment defining region styles and one or more presentation segment, each presentation segment including presentation information and text data for at least one region;

    parsing the text subtitle stream into composition information, rendering information, and the text data for each region;

    storing the parsed composition and the rendering information in a first buffer, and further storing the parsed text data in a second buffer, the text data including one or more text strings for each region;

    rendering the text strings stored in the second buffer into a bitmap object for each region according to the rendering information, and storing the rendered bitmap object into a third buffer; and

    composing the stored bitmap object in a graphics plane for each region according to the composition information.

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