[MPlayer-dev-eng] future plans for libvo draw_osd()

[Michael Niedermayer]

Hi

On Fri, May 25, 2007 at 09:02:44PM +0200, Ilja Kamps wrote:
> On Fri, May 25, 2007 at 10:01:31PM +0400, Evgeniy Stepanov wrote:
> > On Friday 25 May 2007, Attila Kinali wrote:
> > > On Fri, 25 May 2007 01:55:39 +0400
> > >
> > > Evgeniy Stepanov <eugeni.stepanov at gmail.com> wrote:
> > > > Have a look at EOSD (grep in libmpcodecs). It supports color and, imho,
> > > > is better designed. It is used to display subtitles with libass. The old
> > > > subtitle code, which draw_osd() is part of, is currently unmaintained.
> > >
> > > Would it be possible to run all OSD trough EOSD? If so, this
> > > would solve the B/W problem with DVD subs. Though for some badly
> > > made DVDs it should be possible to switch back to the B/W subs.
> > 
> > Yes, but it will need some improvements. Currently ass_image_t contains a 
> > single color + a bitmap of transparency values. For DVD subtitles we need 
> > true RGBA or YUVA bitmaps. Such bitmaps will be also useful in libass (for 
> > both speed and correctness). This can be solved by adding a 'type' or 'csp' 
> > field in ass_image_t.
> 
> Actually DVD subtitles are 4 bit palletted images, so you could do it in
> 4 passes with the current ASS renderer.

wouldnt that be 15 or 16 passes ?

also either way its not correct, if someone does work on the code then he
should implement it properly and that is RGBA32 for image which are RGB32, 
YV12+alpha plane for YV12 images, ...
or to say it differently the subtitles should be in a format which can
quickly be blended into the image with a minimum of byte/bit reordering
and their overall size (=memory bandwidth needed) should be minimal too

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The educated differ from the uneducated as much as the living from the
dead. -- Aristotle 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
URL: <http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/attachments/20070526/f2fef0bf/attachment.pgp>