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| author | Chris Robinson <[email protected]> | 2017-08-16 02:05:10 -0700 |
|---|---|---|
| committer | Chris Robinson <[email protected]> | 2017-08-16 02:05:10 -0700 |
| commit | 520dd5c77972cad13d1a97e228903b3c5bdc384f (patch) | |
| tree | 29d72d9414d1b9d98ebcd80eab3b987eb4425279 /examples/alrecord.c | |
| parent | 4dd53ab9429f0ca561dfd45f8f6022ae9871455a (diff) | |
Make the bsinc table layout more efficient
The old layout separated filters, scale deltas, phase deltas, and scale phase
deltas into separate segments that each contained a numbers of scale and phase
entries, Since processing a sample needed a filter and one of each delta entry
relating to a particular scale and phase, the memory needed would be spread
across the whole table. And since subsequent samples would use a different
phase, it would jump around the table a whole lot as well.
The new layout packs the data in a way more consistent with its use. The
filters, scale deltas, phase deltas, and scale phase deltas are interleaved,
such that for a particular scale and phase, the filter and delta entries used
are contiguous. And the phase entries for a particular scale are kept together,
so the ~500 to ~1000 samples processed per source update stay within the same
3KB to 6KB area of the 70+KB table, which is much more cache friendly.
Diffstat (limited to 'examples/alrecord.c')
0 files changed, 0 insertions, 0 deletions