[vdr] FW: [ANNOUNCE] DVB API improvements

Niels Wagenaar n.wagenaar at xs4all.nl
Wed Sep 24 17:34:01 CEST 2008


Hello all (and especially Klaus):

It's official, the people from V4L have voted for the usage of the S2API proposal to be the future for new DVB API improvements (see the official announcement at the bottom) within the V4L tree. Currently S2API is in a real speed-train and new devices are added very rapidly. Only the devices currently in Multiproto and written by Manu Abraham are not yet ported. Also people are allready busy with patches for Kaffeine (allready done) and MythTV (not seen yet, but it's WIP according to a post on the linux-dvb mailinglist).

So, this should mean that VDR 1.7.x should focus on S2API because of the obvious reasons. Has anybody started on a patch of somekind to include S2API in VDR 1.7.0 or 1.7.1? Mainly I was thinking of doing it myself (I have a Hauppauge WinTV-NOVA-HD-S2 which is allready supported in S2API) in the hope to have it working in the next weekend. But if it's allready done or in progress, then I would like to use my time for something else ;)

Regards,

Niels Wagenaar

-----Original message-----
From: Mauro Carvalho Chehab <mchehab at infradead.org>
Sent: Tue 23-09-2008 23:19
To: DVB ML <linux-dvb at linuxtv.org>; 
Subject: [linux-dvb] [ANNOUNCE] DVB API improvements

> After years of discussions, several patch series and two different proposed
> approaches, LinuxTV developers finally decided that S2API is the better
> technical proposal and should be accepted as the way to allow supporting newer
> DTV standards, starting with DVB-S2.
> 
> As previously announced at http://linuxtv.org/news.php?entry=2008-09-19.mchehab,
> a representative group of active developers at LinuxTV community attended the
> first V4L/DVB Summit, that started with the V4L/DVB miniconf at Linux
> Plumbers/2008. Several other additional formal (BOF's) and informal meetings
> happened there, in the benefit of the improvement of the development of
> multimedia drivers and core.
> 
> During the miniconf, both Multiproto API (proposed by Manu) and S2API (proposed
> by Steven), were presented. A technical discussion was made during the DVB BOF
> session in order to compare the two proposals and check for the
> need/convenience of other core internal changes to draw an evolution timeline
> for DVB.
> 
> The DVB BOF had the presence of the following LinuxTV members:
> 
> 	Douglas Schilling Landgraf
> 	Hans Verkuil
> 	Mauro Carvalho Chehab 
> 	Michael Krufky
> 	Patrick Boettcher
> 	Steven Toth
> 	Thierry Merle
> 	Manjunath Hadlii
> 
> We had also a presence of an end-user listening to the BOF (Brandon Fouts).
> 
> During the BOF, the LinuxTV members carefully analyzed the pros and cons for
> both proposals. At the end, all people present there agreed that S2API is
> technically more reliable in time than Multiproto proposal. So it was decided
> that S2API will be merged upstream.
> 
> The main arguments in favor of S2API over Multiproto are:
> 
> 	- Future proof – the proposal for S2API is more flexible, easily
> 	  allowing the addition of newer features and new standard support;
> 
> 	- Simplicity – S2API patches are very simple, while Multiproto
> 	  presented a very complex series of changes. Simpler approaches
> 	  reduces the time for maintaining the source code;
> 
> 	- Capability of allowing improvements even on the existing standards,
> 	  like allowing diversity control that starts to appear on newer DVB
> 	  devices.
> 
> Some improvements were proposed by the LinuxTV developers, in order to improve
> the S2API, including:
> 
> 	- Adding an API command for querying DVB version, to allow an easier
> 	  detection by userspace applications;
> 
> 	- Name the DVB API with S2API as DVB version 5;
> 
> 	- Update DVB API documentation to reflect the API changes;
> 
> 	- Remove from DVB API the unused API ioctls, to match the API with the
> 	  existing implementations.
> 
> The author of S2API got the task of adding those suggestions at the proposed
> standard and send a pull request to the subsystem maintainer, together with
> patches for his drivers that use the newer API.
> 
> It was also discussed that some of the internal Multiproto API changes may be
> needed in other to support some of the other existing DVB-S2 drivers that were
> developed considering Multiproto API. Internal changes can be added at any time
> without producing problems in the user API.
> 
> The group aims to have a unified in-kernel DVB-S2 HVR4000 / TT-3200 tree (that
> also supports all of the derivative CX24116 / STB0899 known products) within 4
> weeks from the announcement, hopefully in time for kernel 2.6.28. For that, we
> would like to ask Manu to port his drivers to the new API.
> 
> The end goal is to add proper support for all devices that would have been
> supported by multiproto and S2API alike available.
> 
> There are already volunteers working or that have offered to work on Kaffeine
> and MythTV S2API support.
> 
> We still need volunteers to work on dvb-apps support. If you feel that you like
> contribute, please be our guest!
> 
> We would like to thank you all that contributed for those discussions and
> improvements to happen,
> 
> Mauro Carvalho Chehab
> V4L/DVB Maintainer 
>



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