Miguel Ángel zlash
slembcke
/ frame-timing.c
Last active
June 18, 2023 19:05
Filter frame timing to try and remove scheduler jitter.
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| double delta_time_filtered(double dt_nanos){ | |
| // Warm start the filter by assuming 60 Hz. | |
| static double x[] = {1.6e7, 1.6e7, 1.6e7}, y[] = {1.6e7, 1.6e7, 1.6e7}; | |
| // IIR filter coefficients. 2rd order lowpass butterworth at 1/128 the sample rate. | |
| static const double b[] = {6.321391700454014e-5, 0.00012642783400908025, 6.321391700454014e-5}; | |
| static const double a[] = {1.0, -1.9681971279272976, 0.9684499835953156}; | |
| // Apply IIR filter coefficients. | |
| double value = b[0]*dt_nanos; | |
| for(uint i = 2; i > 0; i--){ |