diff --git a/doc/devel/meeting_summary/2023-09-13.txt b/doc/devel/meeting_summary/2023-09-13.txt new file mode 100644 index 000000000..a4b14881b --- /dev/null +++ b/doc/devel/meeting_summary/2023-09-13.txt @@ -0,0 +1,115 @@ +2023-09-13 Lumiera Developers Meeting +===================================== +:Author: Ichthyo +:Date: 2023-09-14 + +Sep 13, 2023 on #lumiera 20:00 - 22:30 UTC + + +__Participants__ + + * ichthyo + * benny + * cehteh + +_Summary written by Ichthyo_ + +'''' + +Focus Topics +------------ +_Ichthyo_ started to define a collection of *FocusTopics*. +These should be topics to focus the further development *after* the current Engine integration effort +is completed. Some existing tickets were extended, and further new tickets created, all marked with +the Tag `FocusTopic` + +-> See https://issues.lumiera.org/report/17[Report-17] in the Lumiera Issue Tracker + + +_Ichthyo_ identified some problematic questions around session modifications and change logging, +especially in connection with rules based configuration. + +In-depth Discussion about event sourcing and session modification + +the problem with configuration changes: these should be recorded as an event in the Event-Log. +This requires however to represent the complete configuration in a consolidated form as part of the Model. +A change in the configuration could then be detected and recorded as an Event. + +Another task to address is how the actual Diff Messages will be generated. We could first manipulate +the data model and then _detect_ a Diff. Yet the favourable solution would be to interpret the Commands +and directly derive Events, with an attached Diff, which can then be applied against the data model +as a projection. + +Discussion what topics should be addressed first + +It seems the topics regarding Event Log and Session persistence #1234 #540 and #569 should be addressed first, +since these may lead to decisions relevant for many other parts of the system. +Possibly also #332 regarding a full definition of placement capabilities. + + +The topic of placement interpretation will already be touched in the *next* vertical slice, +where we intend to add a clip to the timeline. For this we'll need at least a _simple_ resolution +capability of placements, because we'll attempt do the groundwork for the Builder. + +_Benny_ proposes to add »interface« and »mock« tickets for Event-Log and Placements, blocking the +full implementation follow-up tickets. Then these preliminary parts can be addressed first and +integrated as part of the »Add Clip« Vertical Slice. For Context: currently the »Playback« Vertical +Slice is being worked on, aiming at a first integration of the Render Engine. + + +Playback Vertical Slice +----------------------- +_Ichthyo_ reports on the progress of the »Playback Vertical Slice« effort. + +- Memory Manager is implemented and tested +- Activity Language is also completed and tested +- a passive worker pool has been implemented, based on the C++17 concurrency framework + +Next steps... + +- retrofit our existing Thread wrapper (which was based on POSIX) to use C\+\+17 thread support; + this should be a drop-in replacement, since our own old design almost completely matches the + design and feature set standardised with C++17 +- complete implementation of the Scheduler Layer-2, integrating Activity-Language and worker pool +- integration test of the Scheduler + +Documentation Index and Glossary +-------------------------------- +_Benny_ reworked and extended the documentation overview in the Lumiera website. +This can be published now. Moreover, _Benny_ investigated Glossary and Index generation. +It turns out that ASCIIDOC offers already an index generation feature, which could be configured +and used to build an index and a glossary. The next goal would be to build a prototype for testing +and to see how this can be integrated into the website infrastructure. + +Library solutions for Video Display +----------------------------------- +_Benny_ conducted some research regarding library solutions for *video display*, notably +ffmpeg, GStreamer and libVLC. It was rather easy to code up an "hello world" example based on +GStreamer, while it was difficult to find suitable documentation regarding the ffmpeg based +solution. Moreover, GStreamer seems to have a much more active and helpful community. + +Next steps would be to also look more in-depth into libVLC, and especially to compare the +feature sets of these solutions. _Cehteh_ points out that MPV (formerly MPlayer) would also +be an interesting point of reference. _Benny_ mentions that GTK4 offers an integrated +video display capability. + +Extended discussion ensues, regarding video frameworks and the difficulties regarding the plethora +of interfaces, especially when it comes to hardware acceleration support. Ideally, the Lumiera +project should follow the solutions provided by a sufficiently active community, capable to follow +the constant evolution of interfaces and framework. + +It was agreed upon that the »Playback Vertical Slice« just needs a very simple solution to output +raw video (RGB888 or YUV), and offers a good opportunity for experimentation to find a suitable +support framework + + +'''' + +Next meeting +------------ + +The next meeting will be Wednesday Oct 11, 20:00 UTC + + +'''' + + diff --git a/doc/devel/meeting_summary/index.txt b/doc/devel/meeting_summary/index.txt index 2ca5b0411..c7a247b17 100644 --- a/doc/devel/meeting_summary/index.txt +++ b/doc/devel/meeting_summary/index.txt @@ -12,7 +12,22 @@ Anyone interested in Lumiera development is also encouraged to read mailing list archives and other documentation. -12 Sep 2012 +13 Sep 2023 +----------- + +Topics +~~~~~~ + * »Focus Topics« + * Progress on the »Playback Vertical Slice« + * Website Index and Glossary generator + * Library solutions for video display in the GUI + +Summary +^^^^^^^ + * link:2023-09-13.html[Summary (by ichthyo)] + + +12 Sep 2013 ----------- Topics