Metacompressors with HDF5

[juntyr]

Is it possible to express a meta-compressor as an HDF5 filter plugin, i.e. a compressor that calls into one or more wrapped compressors? Metacompressors are useful e.g. when one compressor makes a lossy prediction of the data, and the second computes a correction term that needs both the original data and the prediction as input. Currently, it seems like a few compressors (e.g. BLOSC) work around the issue by only supporting a fixed set of sub-compressors. To have a proper meta-compressor plugin, it would likely need to be able to be configured with the combined configuration of all nested plugins and be able to dynamically load the nested plugins by their ID. Thanks for your help!