[Ffmpeg-devel] [PATCH] HD DVD subtitle decoding

Michael Niedermayer michaelni
Tue Jan 30 01:11:26 CET 2007


On Mon, Jan 29, 2007 at 11:46:00AM +0000, Ian Caulfield wrote:
> >I'm not sure about the yuvtorgb code - I lifted this from dvbsubdec.c, but
> >I
> >> reckon it should probably live somewhere else, though I couldn't decide
> >> where.
> >
> >well choose a filename you like and put it there, copy and paste is not ok
> >ideally the yuv2rgb code from libswscale/ should be used / or the code
> >should
> >be moved into libswscale/ but thats not so important and can be done later
> The defines seem to have been copied from imgconvert.c - should I move the
> yuv->rgb function there? Which would be an appropriate header to insert the
> declaration into?

i dont know, not avcodec.h
maybe just add a new .c + .h file for this

> and guess_palette() could then do the yuv->rgb which is IMHO cleaner then
> >your code where the 2bit palette is "converted" in guess_palette() while
> >the 8bit one is handled while it is read
> I'm not keen on this - in the 2bit case, the "palette" in the bitstream is
> actually a mapping of the four colours in the subtitle onto the external DVD
> 16-color palette. Since we don't have access to this palette, we have to
> guess our own. For 8-bit subtitles, an actual palette is embedded into the
> bitstream, which we can then use. I could rename the guess_palette function
> to guess_palette_2bit, and add an "extract_palette_8bit" function which
> would do the colourspace conversion and merge in the alpha components?

ok, do whatever you think is best, i just want clean,fast,readable and simple

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

While the State exists there can be no freedom; when there is freedom there
will be no State. -- Vladimir Lenin
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