Most animation things are done through the Properties API, and just as there is no Mlt::Property in C++ maybe same thing goes for animation. However, a quick analysis reveals a few things an app might want to do not yet available through Properties. Maybe, it is better to expose these through properties: mlt_properties_anim_is_keyframe mlt_properties_anim_keyframe_type mlt_properties_anim_length mlt_properties_anim_remove mlt_properties_anim_next mlt_properties_anim_previous Properties::anim_is_keyframe Properties::anim_keyframe_type Properties::anim_length Properties::anim_remove Properties::anim_next Properties::anim_previous
All of the above can just use simple, scalar types for parameters instead of making apps deal with new Animation and AnimationItem objects, managing them, and properly interfacing them with properties. Next and previous would take and return a position. Alternatively, Mlt::Properties::get_animation returns a Mlt::Animation*, for which there are only methods to fill the gaps in the properties API: Animation::is_keyframe Animation::keyframe_type Animation::get_length Animation::remove (calls interpolate internally) Animation::next Animation::previous What do you think? On Sat, Jun 6, 2015 at 9:06 AM jb <j...@kdenlive.org> wrote: > Hi all, > > As you might know, we have a student working on integrating animation > property > in Kdenlive. > > The mlt_animation stuff in MLT is still partially implemented in effects > and > transitions. As a starting point, I think we will try to work on the volume > effect that has support for a "level" animated property. > > However, there is currently no Mlt++ wrapper for the MLT animation stuff. > So I > guess we have to add an MltAnimation class, similar to MltGeometry to allow > easy access to the keyframes, types and values in Kdenlive. > > Is this approach ok for you ? Can we start working on a new MltAnimation > class > that will be added to Mlt++ or do you have other ideas about how to > implement > this ? > > Thanks & regards > jb > > > ------------------------------------------------------------------------------ > _______________________________________________ > Mlt-devel mailing list > Mlt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mlt-devel >
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