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45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* Spa */
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/* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
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/* SPDX-License-Identifier: MIT */
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#include "resample-native-impl.h"
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static inline void inner_product_c(float *d, const float * SPA_RESTRICT s,
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const float * SPA_RESTRICT taps, uint32_t n_taps)
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{
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float sum = 0.0f;
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#if 1
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uint32_t i, j, nt2 = n_taps/2;
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for (i = 0, j = n_taps-1; i < nt2; i++, j--)
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sum += s[i] * taps[i] + s[j] * taps[j];
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#else
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uint32_t i;
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for (i = 0; i < n_taps; i++)
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sum += s[i] * taps[i];
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#endif
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*d = sum;
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}
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static inline void inner_product_ip_c(float *d, const float * SPA_RESTRICT s,
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const float * SPA_RESTRICT t0, const float * SPA_RESTRICT t1, float x,
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uint32_t n_taps)
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{
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float sum[2] = { 0.0f, 0.0f };
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uint32_t i;
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#if 1
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uint32_t j, nt2 = n_taps/2;
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for (i = 0, j = n_taps-1; i < nt2; i++, j--) {
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sum[0] += s[i] * t0[i] + s[j] * t0[j];
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sum[1] += s[i] * t1[i] + s[j] * t1[j];
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}
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#else
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for (i = 0; i < n_taps; i++) {
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sum[0] += s[i] * t0[i];
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sum[1] += s[i] * t1[i];
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}
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#endif
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*d = (sum[1] - sum[0]) * x + sum[0];
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}
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MAKE_RESAMPLER_FULL(c);
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MAKE_RESAMPLER_INTER(c);
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