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Adaptive vertical macroblock alignment for mixed frame video sequences

  • US 7,839,933 B2
  • Filed: 10/06/2004
  • Issued: 11/23/2010
  • Est. Priority Date: 10/06/2004
  • Status: Active Grant
First Claim
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1. A method of decoding video using a video decoder, the method comprising:

  • with the video decoder, reading an indication from a compressed video bit stream whether a video sequence encoded in the bit stream contains at least some interlaced video content;

    with the video decoder, reading one or more coded size syntax elements from the bit stream, the one or more coded size syntax elements indicating a coded height of plural frames in the video sequence;

    if the video sequence contains at least some interlaced video content, with the video decoder, for each of the plural frames;

    reading a mode syntax element for the frame from the bit stream, the mode syntax element indicating one of plural coding modes for the frame, the plural coding modes including;

    coded in the bit stream as a frame of progressive video,coded in the bit stream as a frame of interlaced video, andcoded in the bit stream as two separate fields of interlaced video; and

    decoding video content of the frame, wherein the frame has a macroblock-aligned vertical size that depends on the coding mode of the frame, and wherein depending on the coding mode the macroblock-aligned vertical size can vary between the plural frames that have the coded height of the plural frames; and

    otherwise, with the video decoder, decoding the video content of the plural frames in the video sequence.

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