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Video processing technique using multi-buffer video memory

  • US 5,767,863 A
  • Filed: 09/03/1996
  • Issued: 06/16/1998
  • Est. Priority Date: 10/22/1993
  • Status: Expired due to Term
First Claim
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1. A method for storing and retrieving video data from a video memory, the method comprising:

  • dividing the video memory into a first address group, configured to store a first frame of the video data, and a second address group, configured to store a second frame of the video data;

    selecting, using a video-in pointer, a first address in the first address group, the video-in pointer addressing the video memory for storage of the video data into the video memory;

    selecting, using a video-out pointer, a second address in the second address group, the video-out pointer addressing video data in the second address group for displaying the video data;

    determining whether the video-out pointer is beyond a first critical address in the second address group, the first critical address being an address, other than a last address in said second address group, selected to ensure that the video-in pointer may enter and address the second address group without overtaking the video-out pointer addressing video data in the second address group; and

    if the video-out pointer is not beyond the first critical address, preventing the video-in pointer from addressing video data in the second address group until the video-out pointer is beyond the first critical address.

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