The DVD specifications provide 24 System Parameter Registers or SPRMs which hold global values to indicate the current state of the DVD player. Information regarding the current video and audio stream number, chapter, VTS and title number, default region information can be found by reading the contents of SPRMs. Some SPRMs allow updates and some are read-only settings configured by the user or built into the DVD player with default values such as the region information and and audio language preferences.

The following table shows the 24 standard DVD SPRMs. The last three registers (21, 22 and 23) are undefined and reserved for future use. Nine are read-only (0, 12, 14, 15, 16, 17, 18, 19, and 20), and the remaining 12 can be changed by GPRMs or by user inputs through the remote control.

The default values are given in decimal.
Values are player-specific if not defined in the table.
Type "R" means "Read-Only" and "R/W" means "Read/Write".

SPRM	Function	Description	Type	Default
0	Menu description language code	The default language code to use for system menus	R
1	Audio stream number	The number of the audio stream that is currently playing.	R/W	15
2	Subpicture stream number	The number of the subpicture stream that is currently playing.	R/W	62
3	Angle number	The number of the angle stream that is currently playing.	R/W	1
4	Title number	The number of the current title.	R/W	1
5	VTS title number	The number of the current VTS title.	R/W	From SPRM 4
6	Title PGC number	The number of the current title PGC (ttn). Writeable during playback of titles with multiple PGCs.	R/W
7	Part of Title number	The number of the currently playing Part of Title for a title having oly one PGC. Writeable during playback of a title having oly one PGC.	R/W	1
8	Highlighted button number	The number of the currently selected highlight button. Up to 36 buttons can be specified per menu page.	R/W	1
9	Navigation timer	Together with SPRM 10, this register defines the timeout duration to play a specified PGC after the timeout expires. The DVD author sets the value of SPRM 9. This value decreases by 1 each second. When the value reaches zero, the PGC defined in SPRM 10 plays. The countdown pauses at a system menu (title or VTS menu) or if the user pauses playback, then resumes when in the VTS title domain again, or when playback reaches a still cell (still time is defined as 255). Values of SPRM 9 and SPRM 10 can only be changed in the title domain and through the use of navigation commands.	R/W	0
10	PGC to play when Navigation Timer expires	See the description of SPRM 9 above	R/W
11	Player audio mixing mode for karaoke	Status of the karaoke audio mixing mode (whether audio channels 2, 3 and 4 are down-mixed into audio channels 0 and 1). This parameter is ignored if the DVD player does not have the audio mixing function for karaoke.	R/W	0
12	Country code	The country code for parental management.	R
13	Parental level	The parental level for the country identified in SPRM 12.	R/W
14	Player configuration for video	The initial default display aspect ratio and the current display mode.	R
15	Player configuration for audio	The audio capability of the DVD player; that is, the types of encoded audio (AC-3, DTS, MPEG, etc.) it supports, and whether the output is stereo or surround sound.	R
16	Initial language code	The initial language code and its extension for the current audio stream.	R	65535
17	Initial language code extension	The initial language code extension for the current audio stream.	R	0
18	Initial Language Code for Subpicture	The initial language code for the current subpicture stream.	R	65535
19	Initial Language Extension Code for Subpicture	The initial language code extension for the current subpicture stream.	R	0
20	Player region code	The regional code for the region for which the DVD player was built.	R
21	Reserved
22	Reserved	Reserved for extended playback mode.
23	Reserved
SPRM	Function	Description	Type	Default

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