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15a3788e92
Using scripts/syn123-channelscaling.sh, I see about 15% benefit for mono/stereo operation when treating it as special cases in the resampler. Fun fact: Even the higher channel counts profit a tiny bit (1% to 2%, not sure how significant) from the separation. Giving the compiler information about what can be likely values for those inner loop rounds still makes sense. git-svn-id: svn://scm.orgis.org/mpg123/trunk@4494 35dc7657-300d-0410-a2e5-dc2837fedb53
33 lines
939 B
Bash
33 lines
939 B
Bash
#!/bin/sh
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# This gives a view at the scaling of resampling runtime with channel count.
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# The tested resampling mode involves 2X upsampling, lowpass, and interpolation.
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set -e
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export LANG=C
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export LC_NUMERIC=C
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chan_min=1
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chan_max=10
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chan_fit=3
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out123=src/out123
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generate="--wave-freq 300 --inputrate 44100 --timelimit 4410000 -q"
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wd=$(mktemp -d channelscaling.XXXX)
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echo "workdir: $wd"
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for n in $(seq $chan_min $chan_max)
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do
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printf "generate with %d channels\n" "$n" >&2
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/usr/bin/time -f "$n\t%e" $out123 $generate -c $n --rate 44100 -t 2>&1
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done > $wd/generate.txd
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for n in $(seq $chan_min $chan_max)
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do
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printf "resample with %d channels\n" "$n" >&2
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/usr/bin/time -f "$n\t%e" $out123 $generate -c $n --rate 44101 -t 2>&1
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done > $wd/resample.txd
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txdcalc '[3]=[2]-[1,2]' $wd/generate.txd < $wd/resample.txd > $wd/resampling-overhead.txd
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gpfit --plot -g=1 -r='[3:]' $wd/resampling-overhead.txd
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echo "Check results in $wd/."
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