32 lines
825 B
C
32 lines
825 B
C
/* SoX Resampler Library Copyright (c) 2007-12 robs@users.sourceforge.net
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* Licence for this file: LGPL v2.1 See LICENCE for details. */
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void ORDERED_CONVOLVE(int n, void * not_used, DFT_FLOAT * a, const DFT_FLOAT * b)
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{
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int i;
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a[0] *= b[0];
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a[1] *= b[1];
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for (i = 2; i < n; i += 2) {
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DFT_FLOAT tmp = a[i];
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a[i ] = b[i ] * tmp - b[i+1] * a[i+1];
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a[i+1] = b[i+1] * tmp + b[i ] * a[i+1];
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}
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(void)not_used;
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}
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void ORDERED_PARTIAL_CONVOLVE(int n, DFT_FLOAT * a, const DFT_FLOAT * b)
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{
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int i;
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a[0] *= b[0];
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for (i = 2; i < n; i += 2) {
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DFT_FLOAT tmp = a[i];
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a[i ] = b[i ] * tmp - b[i+1] * a[i+1];
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a[i+1] = b[i+1] * tmp + b[i ] * a[i+1];
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}
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a[1] = b[i] * a[i] - b[i+1] * a[i+1];
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}
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#undef ORDERED_CONVOLVE
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#undef ORDERED_PARTIAL_CONVOLVE
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#undef DFT_FLOAT
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