Significant speed-up rate allocation by rate/distoratio ratio#1440
Merged
rouault merged 3 commits intouclouvain:masterfrom Aug 12, 2022
Merged
Significant speed-up rate allocation by rate/distoratio ratio#1440rouault merged 3 commits intouclouvain:masterfrom
rouault merged 3 commits intouclouvain:masterfrom
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…write() to emit single bit
- Avoid doing 128 iterations all the time, and stop when the threshold doesn't vary much - Avoid calling costly opj_t2_encode_packets() repeatdly when bisecting the layer ratio if the truncation points haven't changed since the last iteration. When used with the GDAL gdal_translate application to convert a 11977 x 8745 raster with data type UInt16 and 8 channels, the conversion time to JPEG2000 with 20 quality layers using disto/rate allocation ( -co "IC=C8" -co "JPEG2000_DRIVER=JP2OPENJPEG" -co "PROFILE=NPJE_NUMERICALLY_LOSSLESS" creation options of the GDAL NITF driver) goes from 5m56 wall clock (8m20s total, 12 vCPUs) down to 1m16 wall clock (3m45 total).
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doesn't vary much
layer ratio if the truncation points haven't changed since the last
iteration.
When used with the GDAL gdal_translate application to convert a 11977 x
8745 raster with data type UInt16 and 8 channels, the conversion time
to JPEG2000 with 20 quality layers using disto/rate allocation (
-co "IC=C8" -co "JPEG2000_DRIVER=JP2OPENJPEG" -co "PROFILE=NPJE_NUMERICALLY_LOSSLESS"
creation options of the GDAL NITF driver) goes from 5m56 wall clock
(8m20s total, 12 vCPUs) down to 1m16 wall clock (3m45 total).
to be compared to 34s wall clock (3m5 total) for single quality layer output.