Hi all,
A late (small) change:
The break was moved up by 30 min since Shuah's talk moved up by the same amount.
Regards,
Hans
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Draft agenda for the media workshop October 26, 2015, Seoul, South Korea
Room: TBD
Please be on time! We start at 9 am, we have a full agenda, so we want to make good use of the time.
9:00-9:15: Get laptops hooked up, the projector running, wireless configured, your coffee cup filled, etc. etc. :-)
9:15-9:30: Hans: Introduction
9:30-10:15: Pawel: Update on codec APIs
10:15-10:30: Mauro: kABI documentation improvements
10:30-11:45: Break Allows time for attending Shuah's talk: http://korealinuxforum2015.sched.org/event/f59175cc49f866dbc9bebc36f86fe663#...
11:45-12:15: Junghak: new uAPI for DVB to use streaming I/O
12:15-13:00: Hans: Should we replace v4l2_buffer with a new struct that is y2038-safe and that can be cleaned up and extended? (Think proper support for HW timestamps, etc.). See: https://patchwork.linuxtv.org/patch/31413/
And perhaps use this redesign to add support for multiple streams over one video node? I saw an example where the HW combines two streams into one, basically an m2m device, but today you'd need three nodes: two out and one capture in order to implement this.
13:00-14:30: Lunch
14:30-14:45: Hans: Proposal for adding support for HW colorspace conversion.
14:45-15:00: Hans: poll() behavior for output streams.
15:00-15:15: Hans: Status update of the CEC framework patch series.
15:15-16:00: Hans: Should the v4l2 core just call try_format to validate the format passed in by VIDIOC_CREATE_BUFFERS? Few drivers validate the format and if they do they usually do only partial validation. It's unclear what should happen here. Always calling try_format would also help the vb2 core code. Also discuss DELETE_BUFFERS.
16:00-16:15: Break
16:15-16:30: Mauro: Status update
MC discussions: very tentative, and I'm just listing the topics without scheduling them and in no particular order:
Mauro: Discuss dynamic subtree removal. The workshop might be too soon to discuss this.
Hans: How to implement VIDIOC_SUBDEV_QUERYCAP? (15 min)
Shuah: ENT_F_IO appears to be too generic, requiring additional steps to determine what kind of IO function it is really is. I propose preserving and allowing enough uniqueness to enable drivers to tag the functions when they create them. For example, if AUDIO functions are all tagged ENT_F_IO, bridge driver has to determine what kind of IO it really is. This requires finding the Interface entity associated with the function entity or comparing entity name strings. Instead, if a function can be tagged as Audio Capture when it gets created, these additional steps aren't necessary.
I estimate 15 min for this topic if we need this.
Shuah: Discuss snd-usb-audio control interface mapping to media. snd-usb-audio creates a control device file which could be exposed in a media graph. In some cases, it is a simple mixer control. Expose ENT_F_MIXER entity with an associated interface node MEDIA_INTF_T_ALSA_CONTROL
17:30-17:45: Hans: Discuss future improvements to the workshop format. Right now (as is clear from this schedule) the discussions are very technical, which makes it hard for non-core developers to attend. Perhaps we should do a split format: a half or full day of status updates, discussions to improve application integration, followed by core-developer-only discussions.
Regards,
Hans