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mckero
f731775346
The waterfall showed mirrored/upside-down garbage because the FFT never produced a valid spectrum: 1. g3.c.f() (high-precision sin) had its quadrant-0 case mangled by jadx into a nested-if that returned NaN for small angles - the twiddle factor table ended up with 329/1024 NaN entries. Restored the smali switch: case0->g(), case1->c(), case2->-g(), case3->-c(). 2. i3.d.k() routed the runtime FFT (a5==0, single-thread path) into the else of if(a5!=1) instead of if(a5!=0), so the FFT never ran and the output stayed in the time domain (peak at bin 357 for a 669Hz tone instead of bin 86). Verified with a JVM harness (static-block tables + pure-tone inputs): 200Hz->bin26, 400Hz->bin51, 669Hz->bin86, 1000Hz->bin128, all exact. Twiddle table NaN count: 329 -> 0.