Method for recording data, method for retrieving sets of data, data file, data structure and medium carrying such data
AssigneeThomson Licensing
InventorsNicolaas Johannes Damstra, Robert C. Edge
Life of this patent
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Abstract
After recording a data container, a back-pointer item is recorded, comprising a specific key and an indicator of the length of the data container. This back-pointer item can be used to jump to the beginning of the data container when reading the file backwards. Other types of coding than KLV coding are also proposed. These types of coding can be used for instance to code the back-pointer item.
Claims5
Method for recording encapsulated data on a medium in a recording order, which can be retrieved in an order opposite to the recording order, said method being implemented on a video recorder and comprising the steps of:
- recording on the medium in a recording order, using said video recorder, as a data container, a KLV coded item which comprises a first key indicating type of the encapsulated data, a first length indicator of the length of the encapsulated data, and the encapsulated data;
- recording on the medium in a recording order using said video recorder following the KLV coded item as a relative pointer to the beginning of the preceding data container, a back-pointer KLV coded item having a back pointer length and comprising a second key indicating other encapsulated data being of a back pointer type and a second length indicator of the length of the other encapsulated data and having as the other encapsulated data, a length value of the KLV coded item or a cumulated length value of said length of the KLV coded item and the back pointer length;
- repeating the recording steps.
Dependencies are inferred from the claim text.