[MPlayer-dev-eng] [PATCH] Add DVB teletext support

[Francesco Lavra]

On Sun, 2009-08-30 at 20:58 +0200, Reimar Döffinger wrote:
> On Sun, Aug 30, 2009 at 06:47:48PM +0000, Carl Eugen Hoyos wrote:
> > Francesco Lavra <francescolavra <at> interfree.it> writes:
> > 
> > > I tried playing a DVB stream using the libavformat demuxer, and it
> > > doesn't work. Using the command
> > > mplayer -demuxer lavf dvb://<channel_name>
> > > it hangs in av_open_input_stream(), while if I dump a DVB stream in a
> > > file and try to play it with -demuxer lavf MPlayer exits with "LAVF: no
> > > audio or video headers found - broken file?". Of course, in both cases
> > > playing with the native TS demuxer works fine.
> > 
> > demuxer lavf does not work on ts files for some time.
> 
> It does work for me both with dvb directly and with captured files,
> though not reliably.

Even with the latest patches from Carl Eugen, the lavf demuxer doesn't
demux my DVB streams.
The changes to update_teletext() attached by Reimar don't work with the
native TS demuxer for DVB teletext decoding, and trying to implement the
necessary changes to the TS demuxer (in a way that would be welcome for
inclusion in the MPlayer tree) I figured out that it's not an easy task.
So, I will try to fix the lavf demuxer to make it work with my streams,
and then I will come back to DVB teletext...

> I attached the results of my hacks, but I am stuck since what comes out
> of the demuxer (whether native or lavf) is not even slightly similar
> to teletext data...

If you take a look at the patches I sent on August 16 (especially
03_dvb_teletext.patch), you will see how DVB teletext data must be
decoded.