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/netgear-R7000-V1.0.7.12_1.2.5/ap/gpl/minidlna/ffmpeg-2.3.4/libavfilter/
H A Davf_showcqt.c339 double cw2, cw3, sw2; local
343 cw3 = cw * cw2 - sw * sw2;
344 w = (1.0 + a1 * cw + a2 * cw2 + a3 * cw3) * (1.0/tlen) * s->volume * (1.0/fft_len);

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