[MPlayer-dev-eng] dvdnav second installment, help needed

[David Holm]

Hi,
here is the second dvdnav patch. This one should be stable enough for you to 
add to the cvs tree, I've tested most possibilities and it works with dvdread 
compiled alongside.
I've changed it to use arrowkeys, enter + esc for "return to root menu" when 
using dvdnav. As seeking messes up dvdmenus sometimes I thought this would be 
acceptable, I will implement a function to tell whether it's in a menu or 
not, as when playing the movie seeking of course works well.

As you can see in stream.c dvd menus support something called still pictures. 
This is used commonly in menus to provide a still background. A still picture 
is basically preceeded by an mpeg ps stream which contains a video packet 
with the picture incoded as intra (I assume ;). This is where I need help, 
when the demuxer get's a still picture it currently freaks out since it's 
preceeded only by audio. The demuxer kills mplayer telling me there are too 
many audio packets in the buffer. I understand why this happens but I've been 
unable to make a clean implementation to solve this.
So could someone help me out and have a look at the demuxer to allow it to 
receive only audio (and only video since this is also allowed by the 
standard, although I believe this is already supported?) and keep the current 
frame in buffer.

I haven't implemented subpic support yet, so you won't see any highlights 
over dvd menu items.

libdvdnav can be fetched by cvs from xine-dvdnav.sourceforge.net, checkout 
module xine-dvdnav as it is contained withing that module... configure and 
compile, but don't install unless you intend to use the xine module as well.
-dvdnav plays a dvd and -dvd works as usual.

Arpi: Any comments appreciated if something needs to be changed. Unless 
someone stumbles uppon a bug I don't see why not adding this to the cvs code 
for those who want to experiment with it...

I'm gonna work on the dxr3 kernel modules for a few days, tie up some lose 
bits and pieces. I'm hoping someone would help me with the still picture 
issue while I'm working on it so I can resume nav development when I'm done 
with the modules.

//David Holm
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