[MPlayer-dev-eng] Re: [MPlayer-dev-eng] help request for a dvb-input patch

[nsabbi@libero.it]

>Check this link: 
> 
>http://www.linuxtv.org/mailinglists/linux-dvb/2002/02-2002/msg00014.html 
> 
>Have you tried this? If yes, why didn't it work for you? 
>If no, you won a STFW. 
 
I liked dvbstream so much that I decided to use 99% of its code for my 
patch. Why? Because I need a mechanism to change channel when I'm 
watching TV, to use OSD, to record etc.,  all things that can't be 
easily made using a pipe like  
dvbstream -ps -o 1 2 | mplayer -cache 2048 - 
 
Something that I like is already implemented in mplayer: the TV/TVI 
system, so I'd like to have something of that kind for watching 
DVB-tv. 
 
P.S. what is a STFW? I guess it isn't something nice. 
 
 
I understood the hard way that I don't have to touch the voices in 
streaming_ctrl and that streaming isn't the best way to go, in this 
case. 
 
Yet,  I finally have it working, but with jerky video and using 
horrible  coding practices :) : 
- it uses mpegtools functions to decode from ts -> ps 
- which in turn uses a callback mechanism to tell that it's ready to 
go 
- so I have to use a buffer to interface the callback function and 
dvb_streaming_read. 
 
Please, don't flame me! :) 
 
 
When it's clean I will attach it, if someone wants it. 
 
Regarding the Right Way to go: 
 as far as I'm aware there are two TS demuxers around: one in 
ffmpeg/libav, the other  in mpegtools (part of the  dvb drivers 
written by Ralph Metzler). 
 
Reading the sources it seems that Metzler's ones are more capable, but  
it's a very hard reading indeed (not a single line of comment :( ). 
 
Which one would you suggest to use? 
 
 
Il sab, 2002-09-14 alle 12:29, Arpi ha scritto: 
> Hi, 
>  
> > Hi, I'm trying to write a patch to enable input from my Hauppage 
Nova  
> > dvb card (without hardware mpeg decoder).  
> > Tuning and the flow of data in MPEG PS format are working 
correctly  
> > (thanks to dvbstream! ), but I don't fully understand how the  
> > mechanism of streaming works.  
>  
> hmm 
> imho you'd better creating a new STREAM_TYPE_ and implement a simple 
stream 
> 'driver' for it, instead of using the network streaming layer which 
> as done actually for different purpose. 
>  
> i don't know the Nova features, but if you can program it to send 
PS/PES 
> stream to the device that you can read (even with cat /dev/ost/... > 
mpegpes.mpg 
> or: cat /dev/ost/... | mplayer - ) then it's teh best way. 
>  
> if it can't do PS/PES or you get it fragmented somehow and you have 
to 
> add/remove header bytes etc, then it's more complex. 
> for TS->PS you have to implement a demuxer... it's on my TODO for 
too long 
> but i always delayed as rewritting the MPEG demuxer is also on my 
TODO :) 
>  
>  
> A'rpi / Astral & ESP-team 
>  
> -- 
> Developer of MPlayer, the Movie Player for Linux - 
http://www.MPlayerHQ.hu 
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