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| Newer page: | version 16 | Last edited on Monday, July 13, 2009 3:17:01 pm | by LawrenceDoliveiro | Revert |
| Older page: | version 15 | Last edited on Monday, July 13, 2009 3:12:18 pm | by LawrenceDoliveiro | Revert |
@@ -5,11 +5,11 @@
One or more consecutive VOBUs make up a ''cell''. This is the basic unit of playback in DVD-Video. A cell can have associated program instructions in the virtual machine language, for example telling the player to keep looping the same cell, or jump to another cell.
The cell structure is used, among other things, to define ''parts of titles'' (PTTs), which ordinary users know as "chapters". Why they couldn't just call them chapters in the spec, I don't know...
-A ''program chain'' (PGC) defines a sequence of cells and the program instructions associated with them. It also defines the palette of 16 colours available for use in subpictures. Typically one PGC defines one ''title'' (or menu) on the disc, though it is possible to chain multiple PGCs together (hence the name) to make up a title. PGCs are kept in the IFO file.
+A ''[
program chain|http://www.mpucoder.com/DVD/pgc.html]
'' (PGC) defines a sequence of cells and the program instructions associated with them. It also defines the palette of 16 colours available for use in subpictures. Typically one PGC defines one ''title'' (or menu) on the disc, though it is possible to chain multiple PGCs together (hence the name) to make up a title. PGCs are kept in the IFO file.
-A PGC can also specify ''prohibited operations''--that is, the user is not allowed to use controls like the fast-forward button to skip over this PGC. This is used to do things like display those obnoxious copyright warnings, and distributor logos. Some discs in the US even have ads that the viewer is forced to watch before getting to the content that they bought the disc for.
+A PGC can also specify ''[
prohibited operations|http://www.mpucoder.com/DVD/uops.html]
''--that is, the user is not allowed to use controls like the fast-forward button to skip over this PGC. This is used to do things like display those obnoxious copyright warnings, and distributor logos. Some discs in the US even have ads that the viewer is forced to watch before getting to the content that they bought the disc for.
The ''first program chain'' (FPC) is a special PGC that contains commands that are executed when the disc is inserted into the player. This typically contains a command like "jump to main menu", or perhaps "jump to copyright warning sequence", which in turn jumps to the main menu.
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