[Hts-engine-users] flite+hts_engine on mobile devices

[Nicholas V. <nv...@bi...>]

A few comments to Pieter's earlier mail...

Do the for-loop expansion in HTS_PStream_calc_wuw_and_wum().
Then convert the pdf and inf files to C structs. (It's more Flite-style
anyway.)
Now you can add actually do finv() and surprisingly many other
calculations beforehand (and store their results into C structs
corresponding pdf&inf files)...

Modify your program so, that you start can play data even during
synthesis, if not already doing so.

Traversing the trees used to be a really bad bottleneck in the past, but
not so much anymore. (It used to be recursive etc.) Depending on the
questions/patterns you use, you might be able to optimize it a bit
further.
(For 90%+ a mere strstr() would suffice...)

In PDA convert doubles to floats. If your target device does not have a
FPU, consided fixed-point arithmetics.

Memory (de)allocations take time. In stead of allocating a matrix, you
might allocate a single large chunk (the code would have to be modified
accordingly).

Also combining integrating Flite and HTS engine might help. (Flite's
Segment and HTS engine's HTS_LabelString have a lot in common.) However,
this would require large restructuring and rewrite of the code.

br,
  Nicholas