mirror of https://github.com/encounter/SDL.git
gen_audio_resampler_filter.c: Precalculate loop-invariant bessel(beta).
Minor optimization in offline code.
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@ -74,11 +74,12 @@ kaiser_and_sinc(float *table, float *diffs, const int tablelen, const double bet
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{
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const int lenm1 = tablelen - 1;
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const int lenm1div2 = lenm1 / 2;
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const double bessel_beta = bessel(beta);
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int i;
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table[0] = 1.0f;
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for (i = 1; i < tablelen; i++) {
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const double kaiser = bessel(beta * sqrt(1.0 - pow(((i - lenm1) / 2.0) / lenm1div2, 2.0))) / bessel(beta);
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const double kaiser = bessel(beta * sqrt(1.0 - pow(((i - lenm1) / 2.0) / lenm1div2, 2.0))) / bessel_beta;
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table[tablelen - i] = (float) kaiser;
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}
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