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configure: speed up print_enabled_components()

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x4 - x10 faster.

Inside print_enabled components, the filter_list case invokes sed
about 350 times to parse the same source file and extract different
info for each arg. This is never instant, and on systems where fork is
slow (notably MSYS2/Cygwin on windows) it takes many seconds.

Change it to use sed once on the source file and set env vars with the
parse results, then use these results inside the loop.

Additionally, the cases of indev_list and outdev_list are very
infrequent, but nevertheless they're faster, and arguably cleaner, with
shell parameter substitutions than with command substitutions.

Tested-by: Michael Niedermayer <michael@niedermayer.cc>
Tested-by: Helmut K. C. Tessarek <tessarek@evermeet.cx>
Tested-by: Dave Yeo <daveryeo@telus.net>
Tested-by: Reino Wijnsma <rwijnsma@xs4all.nl>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Avi Halachmi (:avih) 2018-07-30 22:48:04 +03:00 committed by James Almer
parent 58b81ac621
commit 923586a58f
1 changed files with 7 additions and 6 deletions

13
configure vendored

@ -7237,9 +7237,10 @@ echo "#endif /* AVUTIL_AVCONFIG_H */" >> $TMPH
cp_if_changed $TMPH libavutil/avconfig.h
full_filter_name(){
sed -n "s/^extern AVFilter ff_\([avfsinkrc]\{2,5\}\)_$1;/\1_$1/p" $source_path/libavfilter/allfilters.c
}
# full_filter_name_foo=vf_foo
# full_filter_name_bar=asrc_bar
# ...
eval "$(sed -n "s/^extern AVFilter ff_\([avfsinkrc]\{2,5\}\)_\(.*\);/full_filter_name_\2=\1_\2/p" $source_path/libavfilter/allfilters.c)"
# generate the lists of enabled components
print_enabled_components(){
@ -7252,13 +7253,13 @@ print_enabled_components(){
if enabled $c; then
case $name in
filter_list)
c=$(full_filter_name $(remove_suffix _filter $c))
eval c=\$full_filter_name_${c%_filter}
;;
indev_list)
c=$(add_suffix _demuxer $(remove_suffix _indev $c))
c=${c%_indev}_demuxer
;;
outdev_list)
c=$(add_suffix _muxer $(remove_suffix _outdev $c))
c=${c%_outdev}_muxer
;;
esac
printf " &ff_%s,\n" $c >> $TMPH