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GameGain 2 3 8 2010 (Boost Gaming Performance)

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In bitstream recording one is free to subdivide the bitstream into sub-units of more regular structure. Presentation data in DVDs (digital video or versatile disc) is organised into units called Video Object Unit, denoted VOBU, e.g. in the DVD Specifications for Video Recording. VOBUs have a variable size (data amount measured in number of sectors), but have also a variable duration (measured in number of video fields).

For data retrieval from the disc the DVD Specifications for Video Recording foresees a `VOBU map` which is a table where for every VOBU in a recording, the length in sectors and the duration in fields is entered.

The directory and file structure of DVD Stream Recording is organised in Stream Data and Navigation Data of the DVD Stream Recording as follows:

Any DVD Streamer Device has certain requirements to store its own, Streamer-specific navigation data on the disc. These data are solely for helping the retrieval of recorded data; they need not be understood or even be visible to any outside Application Device.

Any DVD Streamer Device needs to communicate with the Application Device it is connected to. This communication should be straight forward, and as universal as possible, so that the maximum possible range of applications--both today and future--can be connected to the Streamer. The Navigation Data to support such communication must be understandable by the Streamer as well as by the Application Device; they will be called \"Common navigation data\" in the following.

The Streamer Device should offer to the connected Application Device a means for storing its own private data of any desired kind. The Streamer needs not to understand any of the content, internal structure, or meaning of this \"Application-specific navigation data\".

Navigation data is provided to control the recording, playing back, and editing of any bitstreams that are recorded. In DVD Stream Recording, Navigation Data is called \"Streamer Information\" (STRI). STRI consists of six kinds of information tables, namely Streamer Video Manager Information (STR_VMGI), Stream File Information Table (SFIT), Original Program Chain Information (ORG_PGCI), User Defined Program Chain Information Table (UD_PGCIT), Text Data Manager (TXT_DT_MG), and Application Private Data Manager (APD_MG).

The Stream File Information Table contains the information where on the recording media the stream data are recorded. The Original PGC Information has the function of a play list, which contains all takes which were made. A take is defined as containing the information between a start and a stop action in the sequence of recording or also called one program of the ORG_PGCI. In addition, a Stream Object (SOB) contains a full take or part of a take. With both tables the data can be retrieved for playback.

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