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authorGanesh Ajjanagadde <gajjanagadde@gmail.com>2015-11-04 22:02:13 -0500
committerGanesh Ajjanagadde <gajjanagadde@gmail.com>2015-11-05 21:52:40 -0500
commitc8780822bacc38a8d84c882d564b07dd152366ed (patch)
tree594963f040c580cdd41a64fdfced3d555d039575 /libavutil/samplefmt.c
parent7d6a4797f17f29ed6f48eecbf9c50ae99a8fb04d (diff)
downloadffmpeg-c8780822bacc38a8d84c882d564b07dd152366ed.tar.gz
swresample/resample: speed up build_filter for Blackman-Nuttall filter
This uses the trigonometric double and triple angle formulae to avoid repeated (expensive) evaluation of libc's cos(). Sample benchmark (x86-64, Haswell, GNU/Linux) test: fate-swr-resample-dblp-44100-2626 old: 1104466600 decicycles in build_filter(loop 1000), 256 runs, 0 skips 1096765286 decicycles in build_filter(loop 1000), 512 runs, 0 skips 1070479590 decicycles in build_filter(loop 1000), 1024 runs, 0 skips new: 588861423 decicycles in build_filter(loop 1000), 256 runs, 0 skips 591262754 decicycles in build_filter(loop 1000), 512 runs, 0 skips 577355145 decicycles in build_filter(loop 1000), 1024 runs, 0 skips This results in small differences with the old expression: difference (worst case on [0, 2*M_PI]), argmax 0.008: max diff (relative): 0.000000000000157289807188 blackman_old(0.008): 0.000363951585488813192382 blackman_new(0.008): 0.000363951585488755946507 These are judged to be insignificant for the performance gain. PSNR to reference file is unchanged up to second decimal point for instance. Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Diffstat (limited to 'libavutil/samplefmt.c')
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