Allow processing in blocks

[superbock]

Right now, madmom supports two basic processing schemes, online (causal) and offline. The former only requires past data, whereas the latter needs the whole sequence/signal to be present at once (e.g. Viterbi decoding or bidirectional RNNs).

When processing is purely online or requires only a certain context, it could be computed in blocks. Thus it would be great to have a block_size parameter added to process() methods. E.g. it can save a lot of memory (and can be faster, too) to process everything in blocks of 2048 frames instead of whole length pieces.

[worldveil]

Curious if this is still an issue? It seems like some processors, like the RNN beat tracker have an online mode, but many data processors, ie: spectrogram difference, don't. I do see the use of FramedSignalProcessor, does this enable the paradigm you're suggesting or are there still missing usecases?

Otherwise, I assume the prescribed way to go about block processing is just to window / frame the signal yourself and do it that way