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DVD Demystified

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270<br />

Figure 6.17<br />

Presentation data<br />

structure<br />

Chapter 6<br />

which case they follow the previous and next links (if present) in the PGCI<br />

(see Figure 12.4 for an example remote control).<br />

Control Information Control information describes the data. This<br />

includes characteristics such as format (525/60 or 625/50), aspect ratio (4:3<br />

or 16:9), language, audio and subpicture selection, and moral codes for<br />

parental management. These are described elsewhere in more detail.<br />

Search Data Search data defines a navigational structure that can be<br />

steered through with the remote control or by program control. There are<br />

seven search types, described in Table 6.12, which are associated with a key<br />

or combination of keys on the remote control. These searches are associated<br />

with a PGC; the search map is stored in the PGCI. Additional search types<br />

are provided for parts of titles (chapters), time, angles, and VOBUs (for trick<br />

play modes such as slow and fast).

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