[vlc-devel] Re: ps.c and VCD's use

Gildas Bazin gbazin at netcourrier.com
Thu Jul 24 01:29:16 CEST 2003

On Wednesday 23 July 2003 05:33, R. Bernstein wrote:
> Found a solution to my problem. Not elegant, but it works.
>  > ... The Chapter Up/Down buttons don't have any effect.
>  > These buttons probably need trigger a call VCDSeek somehow and I don't 
>  > how that cause and effect is supposed to happen. Clues? 
> What I noticed is that the only thing I can guarentee is that i_part
> in the selected area changes. So I save i_part (or the current entry)
> internally and compare with the selected area i_part ON EACH READ. If
> i_part changes with respect to what I've saved, I do an internal
> "seek" accordingly. It would be more elegant to say have a callback
> from the button press so a test on each read doesn't have to be done.

Afaik you don't have to do that because you know when the user changes the 
normal flow of the reading (seek, chapter/title change).

I suppose you already had a look at modules/access/dvdplay/access.c ?

The inportant functions here are:

    p_input->pf_read = dvdplay_Read;
    p_input->pf_seek = dvdplay_Seek;
    p_input->pf_set_area = dvdplay_SetArea;

pf_set_area should be called on each chapter or title change so you should 
be able to track the changes you want.

> A remaining open problem is how to set a VCD configuration variable. 

What do you mean exactly by VCD configuration variables ?
Do you mean the "chapter" and "title" variables that are used by the new 
interfaces to get/set the chapter/title value ?
The wxWindows/MacOSX interfaces use these kind of 'variables' to build their 
navigation menu.

(look for things like var_Create( p_input, "chapter", VLC_VAR_INTEGER | 
VLC_VAR_HASCHOICE ); in src/input/input_programs.c
or var_Change( p_input, "chapter", VLC_VAR_SETVALUE, &val, NULL );
in modules/dvdplay/access.c)

Hope this helps,


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