media-workshop September 2013

media-workshop@linuxtv.org

18 participants
4 discussions

V2: Agenda for the Edinburgh mini-summit
by Hans Verkuil 22 Oct '13

22 Oct '13

I have collected all the ideas up to now in a V2 of the agenda. The items are grouped by the person(s) that suggested them. As done in the past those who suggested a topic and who will attend the mini-summit are expected to prepare for it, perhaps making a (very) small presentation if necessary. Hans Verkuil: - Discuss ideas/use-cases for a property-based API. An initial discussion appeared in this thread: http://permalink.gmane.org/gmane.linux.drivers.video-input-infrastructure/6… - What is needed to share i2c video transmitters between drm and v4l? Hopefully we will know more after the upcoming LPC. - Decide on how v4l2 support libraries should be organized. There is code for handling raw-to-sliced VBI decoding, ALSA looping, finding associated video/alsa nodes and for TV frequency tables. We should decide how that should be organized into libraries and how they should be documented. The first two aren't libraries at the moment, but I think they should be. The last two are libraries but they aren't installed. Some work is also being done on an improved version of the 'associating nodes' library that uses the MC if available. - Define the interaction between selection API, ENUM_FRAMESIZES and S_FMT. See this thread for all the nasty details: http://www.spinics.net/lists/linux-media/msg65137.html - VIDIOC_TRY_FMT shouldn't return -EINVAL when an unsupported pixelformat is provided, but in practice video capture board tend to do that, while webcam drivers tend to map it silently to a valid pixelformat. Some applications rely on the -EINVAL error code. We need to decide how to adjust the spec. I propose to just say that some drivers will map it silently and others will return -EINVAL and that you don't know what a driver will do. Also specify that an unsupported pixelformat is the only reason why TRY_FMT might return -EINVAL. Alternatively we might want to specify explicitly that EINVAL should be returned for video capture devices (i.e. devices supporting S_STD or S_DV_TIMINGS) and 0 for all others. Mauro Carvalho Chehab: - Better integration between DVB and V4L2, including starting using the media controller API on DVB side too. - Get the status about the media controller API usage on ALSA. Oliver Schinagl, Benjamin Gaignard, Hugues Fruchet, Laurent Pinchart, Pawel Osciak: - How to handle codecs where part of the processing is done in HW and part in SW? Sakari Ailus: - Multi-format frames and metadata. Support would be needed on video nodes and V4L2 subdev nodes. I'll prepare the RFC for the former; the latter has an RFC here: http://www.spinics.net/lists/linux-media/msg67295.html Ricardo Ribalda Delgado, Sylwester Nawrocki: - Support for multiple rectangle cropping See thread: http://www.spinics.net/lists/linux-media/msg67824.html Feel free to add suggestions to this list. As it stands I don't think it will be possible to handle it all in one day. In particular the codec problem as mentioned by Oliver et al needs a lot of time. Should we set aside a separate day for just this? October 21 or 22 would work for me. I would really like to get some feedback on this. If we decide to go for a second day for this topic, then I can see if I can get a room. It looks like there is a lot of interest in getting this sorted, so brainstorming for a day might be quite useful. Note: my email availability will be limited in the next two weeks, especially next week, as I am abroad (LinuxCon and LPC). Regards, Hans _______________________________________________ media-workshop mailing list media-workshop(a)linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/media-workshop

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Kernel Summit Media Mini-summit attendees on Oct 23 in Edinburgh
by Mauro Carvalho Chehab 11 Oct '13

11 Oct '13

Hi, I'm trying to consolidate the list of interested people on participating at this year's the media mini-summit. From what I got from the discussions, we have, so far: Benjamin Gaignard <benjamin.gaignard(a)linaro.org> Guennadi Liakhovetski <g.liakhovetski(a)gmx.de> Hans Verkuil <hverkuil(a)xs4all.nl> Hugues FRUCHET <hugues.fruchet(a)st.com> Laurent Pinchart <laurent.pinchart(a)ideasonboard.com> Mauro Carvalho Chehab <m.chehab(a)samsung.com> Michael Krufky <mkrufky(a)kernellabs.com> Oliver Schinagl <oliver+list(a)schinagl.nl> Pawel Osciak <posciak(a)chromium.org> Peter Senna Tschudin <peter.senna(a)gmail.com> Ricardo Ribalda Delgado <ricardo.ribalda(a)gmail.com> Sakari Ailus <sakari.ailus(a)iki.fi> Please let me know if I'm missing someone, or if one of the above won't be able to go to the meeting, as my plan is to send the invitations tomorrow. Thank you! Mauro

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Agenda for the Edinburgh mini-summit
by Hans Verkuil 25 Sep '13

25 Sep '13

OK, I know, we don't even know yet when the mini-summit will be held but I thought I'd just start this thread to collect input for the agenda. I have these topics (and I *know* that I am forgetting a few): - Discuss ideas/use-cases for a property-based API. An initial discussion appeared in this thread: http://permalink.gmane.org/gmane.linux.drivers.video-input-infrastructure/6… - What is needed to share i2c video transmitters between drm and v4l? Hopefully we will know more after the upcoming LPC. - Decide on how v4l2 support libraries should be organized. There is code for handling raw-to-sliced VBI decoding, ALSA looping, finding associated video/alsa nodes and for TV frequency tables. We should decide how that should be organized into libraries and how they should be documented. The first two aren't libraries at the moment, but I think they should be. The last two are libraries but they aren't installed. Some work is also being done on an improved version of the 'associating nodes' library that uses the MC if available. - Define the interaction between selection API, ENUM_FRAMESIZES and S_FMT. See this thread for all the nasty details: http://www.spinics.net/lists/linux-media/msg65137.html Feel free to add suggestions to this list. Note: my email availability will be limited in the next three weeks, especially next week, as I am travelling a lot. Regards, Hans

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Linux Media mini-summit in Edinburgh
by Mauro Carvalho Chehab 09 Sep '13

09 Sep '13

Hi media developers, This year, we're planning to do a media mini-summit together with the conferences that will be hosted in Edinburgh (LinuxCon EU/ELCE/KS/...), at the Oct 21-25 week. We don't have the specific days for the event yet (we're still closing it with Linux Foundation). Yet, I'd like to know who is interested on participate on the event, and ask for the theme proposals for the discussions. As we're doing over the last years, we'll be using the media-workshop(a)linuxtv.org mailing list for such discussions. Thank you! -- Cheers, Mauro

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media-workshop September 2013