User Guide

System Parameters 217
System Parameters
System parameters, or SPRMs, indicate the status of DVD player parameters, such as the
video or audio stream, timer, chapter, title number, and so forth. Navigation commands can
use these SPRM values for a variety of purposes. Some SPRMs can be set in the player, such
as which audio stream or subpicture stream to play, and some SPRMs are read-only settings
configured by the viewer or built into the players, such as the parental permissions level and
language preferences.
There are 24 SPRMs, as shown in Table 10 on page 217 (default values are given in
hexadecimal, decimal, and binary numbers). Three are reserved for future assignment by the
DVD Forum, nine are read-only parameters (0, 12, 14, 15, 16, 17, 18, 19, and 20), and the
remaining 12 can be changed by GPRMs or by viewer input.
Table 10: System parameters
No. Name Description Read/
Write
Default
Value
0 Menu description
language code
Specifies the code of the language to use for
system menus.
R Not
defined
1 Audio stream
number
Specifies the number of the current audio stream. R/W 000Fh
15d
1111b
2 Subpicture stream
number
Specifies the number of the current subpicture
stream.
R/W 62d
111110 b
3 Angle number Specifies the number of the current angle stream. R/W 1
4 Title number Specifies the number of the current title. R/W 1
5 VTS title number Specifies the number of the current VTS title. R/W From
SPRM 4
6 Title PGC number Specifies the number of the current title PGC.
Also writeable during playback of Multi_PGC_Title.
R/W Not
defined
7 Part of Title number Specifies the number of the current Part of Title
for a One_Sequential_PGC_Title. Also writeable
via playback of One_Sequential_PGC_Title.
R/W 1