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9c8913437b
Add a sinc based resampler that, unlike speex, avoids memcpy and works directly on the source data. It also allows for ssse3 optimizations and aligned loads. It will later switch to table interpolation when doing variable rate.
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* Spa
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*
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* Copyright © 2019 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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static 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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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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*d = sum;
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}
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static 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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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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*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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