Recommendation for the DVD-Video Player

According to the request from Record Industries Association of Japan (RIAJ) and Japan Video Software Association (VSAJ), WG1 of DVD Forum made the following recommendation for the DVD player in regard with its button's name and function. Please refer to the following recommendation.

Note: Concerning the name of button, this recommendation is applied to the DVD Video Player to be used in Japan. For the player to be used in other countries, the name of its button may be discussed according to the situation of each country.

The following is the list of recommended buttons:

Type	Japanese name	English name	Recommended function
Type A	Note 2	TOP MENU	This button has two functions as follows: 1) Call the Title menu 2) Resume from Menu Above functions are alternated when user presses the button. As for details, see "Rules of Menu call and resume".
	Note 2	MENU	This button has two functions as follows: 1) Call the Root menu 2) Resume from Menu Above functions are alternated when user presses the button. As for details, see "Rules of Menu call and resume".
	Note 2	ANGLE	This button has the function, which changes the status to make Angle change possible. The angle should be changed by this button itself and may be changed by other buttons.
	Note 2	RETURN	This button has the function, which goes back to the specified position defined by Contents provider. Actually GoUp PGC number decides the position.
	Note 2	ENTER	This button has the function, which activates the selected button on screen
Type B	Note 2	SETUP	This button has the function, which calls the screen for Player's initial setting, such as Menu language, parental level.
	Note 2	SUBTITLE	This button has the function, which changes the status to make Subtitle change possible. The subtitle should be changed by this button itself and may be changed by other buttons.
	Note 2	SUBTITLEON/OFF	This buttons has the function, which turns on/off the display of the subtitle without stopping decoding of the subtitle. Therefore, even if this button turns off the subtitle, the forced display is available.
	Note 2	AUDIO	This button has the function, which changes the status to make Audio change possible. The audio should be changed by this button itself and may be changed by other buttons.
	PS/LB	PS/LB	This button has the function, which directly changes the display mode on 4:3 screen to Pan-scan or Letterbox.
	or (Note3)	or (Note3)	This button has the function, which skips to the previous PTT (Part of Title) /PG(Program) or the next PTT/PG.
	or (Note3)	or (Note3)	This button has the function, which carries out the fast froward or fast reverse presentation.

Note 1:	Type A is the buttons, which should be implemented as a single button. Type B may not be implemented as the button itself. But when a button is implemented, it should be implemented as a single button.
Note 2:	Unfortunately, Japanese cannot be expressed in the Web site at this moment. Therefore, for the Japanese name of the button, please refer to the DVD Forum News, Volume 4, which is published in December 1998.
Note 3:	Only mark of the button is recommended. The name of the button may be different for each company, such as Prev./Next or Skip.

Rules of Menu call and Resume
The function of [TOP MENU] and [MENU] button should keep the following rules:

1) Each button has two functions respectively:

• Menu_Call(): Call the entry of Title Menu and Root menu
  
• RSM : Resume to play back the Tile according to Resume information

2) In Stop State or Title Domain

• Both [TOP MENU] and [MENU] shall have the function of Menu_Call().
  
• If no entry point of the related menu exists in Menu Space, the function of Menu_Call() is not executed even if [TOP MENU] or [MENU] is pressed.

3) Transition to Menu Space from Stop State or Title Domain

• When the transition is occurred by [TOP MENU], the function of [TOP MENU] is changed from Menu_Call() to RSM and the function of [MENU] is kept as Menu_Call() in Menu Space.
• When the transition is occurred by [MENU], the function of [MENU] is changed from Menu_Call() to RSM and the function of [TOP MENU] is kept as Menu_Call() in Menu Space.
  
• When the transition is occurred by Navigation Command, the function of [TOP MENU] and [MENU] is kept as Menu_Call() in Menu Space.

4) In Menu Space (VMGM_DOM and VTSM_DOM)

a) In case that the function of [TOP MENU] is RSM and [MENU] is Menu_Call(),

• When [TOP MEMU] is pressed and if Resume information exists, RSM (the transition to Title Domain) is executed and then the function of [TOP MENU] is changed to Menu_Call() and the function of [MENU] is kept as Menu_Call().
• When [TOP MEMU] is pressed and if no Resume information exists, RSM is not executed and the function of [TOP MENU] and [MENU] is not changed.
• When [MEMU] is pressed, Menu_Call() (the transition to Root menu) is executed and then the function of [TOP MENU] is changed to Menu_Call() and the function of [MENU] is changed to RSM. In case that no entry of Root menu exists, the transition to Root menu is not actually executed although Menu_Call() is executed.
• In other cases, the function of [TOP MENU] and [MENU] are not changed.

b) In case that the function of [TOP MENU] is Menu_Call() and [MENU] is RSM,

• When [MEMU] is pressed and if Resume information exists, RSM (the transition to Title Domain) is executed and then the function of [MENU] is changed to Menu_Call() and the function of [TOP MENU] is kept as Menu_Call().
• When [MEMU] is pressed and if no Resume information exists, RSM is not executed and the function of [TOP MENU] and [MENU] is not changed.
• When [TOP MEMU] is pressed, Menu_Call() (the transition to Title menu) is executed and then the function of [TOP MENU] is changed to RSM and the function of [MENU] is changed to Menu_Call(). In case that no entry of Title menu exixts, the transition to Title menu is not actually executed although Menu_Call() is executed.
• In other cases, the function of [TOP MENU] and [MENU] is not changed.

c) In case that the function of [TOP MENU] and [MENU] is Menu_Call() ,

• When [TOP MENU] is pressed, Menu_Call() (the transition to Title menu) is executed and then the function of [TOP MENU] is changed to RSM and the function of [MENU] is kept as Menu_call(). In case that no entry of Title menu, the transition to Title menu is not actually executed although Menu_Call() is executed.
• When [MENU] is pressed, Menu_Call() (the transition to Root menu) is executed and then the function of [MENU] is changed to RSM and the function of [TOP MENU] is kept as Menu_call(). In case that no entry of Root menu, the transition to Root menu is not actually executed although Menu_Call() is executed.
• In other cases, the function of [TOP MENU] and [MENU] is not changed.