- Add mtd_meta_clear to allow specific analytics-meta to handle their clear
operation specific to their type.
- Clear mtd's attached when analytic-meta is freed. When the buffer where
analytics-meta is attached is not from a buffer pool
gst_analytics_relation_meta_clear will not be called unless we explicitly call
it in _free. This important otherwise _mtd_clear are not called and lead to
leak if embedded mtd's allocated memory
- Un-ref in transform if it's a copy
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6026>
- GstAnalyticRelationMeta is a base class for analytics
meta. It's able to store analytics results (GstAnalyticRelatableMtd)
and describe the relation between each analysis results.
- GstAnalysisRelationMeta also contain an algorithm able to explore
analysis results relation using a bfs.
- Relation(edge) between analysis results (vertice) are stored in an adjacency-matrix
that allow to quickly identify if two analysis results are related and by
which relation they related. It also work for indirect relation
and can provide the path of analysis results by which two
analysis results are related.
- One allocation per buffer to store analysis results. Here we rely on
the application to guess how much space will be required to store all
analysis results. This is something that could be improved
significantly but it's a starting point.
- Define common analysis results, classification, object-detection,
tracking that are subclass of GstAnalyticRelatableMtd. The also
provide exemple of how to extend GstAnalyticRelatableMtd to have them
benefit for the mechanim to express relation with other analysis
results.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4962>
