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Specialized segmenters for typical PCM audio granularities

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These are significantly faster (20-35%) than the variable
granularity segmenter.
This commit is contained in:
Marcus Holland-Moritz 2023-08-27 18:23:05 +02:00
parent 88f2d44f05
commit bf4da2fb36
1 changed files with 20 additions and 2 deletions
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22
src/dwarfs/segmenter.cpp
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@ -1237,12 +1237,30 @@ create_segmenter2(logger& lgr, progress& prog,
segmenter::config const& cfg, segmenter::config const& cfg,
compression_constraints const& cc, size_t total_size, compression_constraints const& cc, size_t total_size,
segmenter::block_ready_cb block_ready) { segmenter::block_ready_cb block_ready) {
if (!cc.granularity || cc.granularity.value() == 1) { uint32_t granularity = cc.granularity ? cc.granularity.value() : 1;
auto make_const_granularity_segmenter = [&]<uint32_t Granularity>() {
return make_unique_logging_object< return make_unique_logging_object<
segmenter::impl, segmenter::impl,
constant_granularity_segmenter_<SegmentingPolicy, 1>::template type, constant_granularity_segmenter_<SegmentingPolicy,
Granularity>::template type,
logger_policies>(lgr, prog, std::move(blkmgr), cfg, total_size, logger_policies>(lgr, prog, std::move(blkmgr), cfg, total_size,
std::move(block_ready)); std::move(block_ready));
};
switch (granularity) {
case 1:
return make_const_granularity_segmenter.template operator()<1>();
case 2: // 16-bit mono PCM audio
return make_const_granularity_segmenter.template operator()<2>();
case 3: // 24-bit mono PCM audio
return make_const_granularity_segmenter.template operator()<3>();
case 4: // 16-bit stereo PCM audio
return make_const_granularity_segmenter.template operator()<4>();
case 6: // 24-bit stereo PCM audio
return make_const_granularity_segmenter.template operator()<6>();
default:
break;
} }
return make_unique_logging_object< return make_unique_logging_object<