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424c74d006
Remove the paragraph about writing to the Free Software Foundation's mailing address. The FSF has changed addresses in the past, and may do so again. In 2021 this is not useful, let's rather have a bit less boilerplate at the start of source files. Change-Id: I8ba71ab9ccde4ba25151ecbeb2a323f706b57d43
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
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* Convolution
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* Copyright (C) 2012, 2013 Thomas Tsou <tom@tsou.cc>
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*/
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#include <malloc.h>
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#include <string.h>
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#include <stdio.h>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* Base multiply and accumulate complex-real */
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static void mac_real(const float *x, const float *h, float *y)
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{
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y[0] += x[0] * h[0];
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y[1] += x[1] * h[0];
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}
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/* Base multiply and accumulate complex-complex */
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static void mac_cmplx(const float *x, const float *h, float *y)
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{
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y[0] += x[0] * h[0] - x[1] * h[1];
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y[1] += x[0] * h[1] + x[1] * h[0];
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}
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/* Base vector complex-complex multiply and accumulate */
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static void mac_real_vec_n(const float *x, const float *h, float *y,
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int len)
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{
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for (int i=0; i<len; i++)
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mac_real(&x[2 * i], &h[2 * i], y);
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}
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/* Base vector complex-complex multiply and accumulate */
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static void mac_cmplx_vec_n(const float *x, const float *h, float *y,
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int len)
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{
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for (int i=0; i<len; i++)
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mac_cmplx(&x[2 * i], &h[2 * i], y);
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}
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/* Base complex-real convolution */
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int _base_convolve_real(const float *x, int x_len,
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const float *h, int h_len,
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float *y, int y_len,
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int start, int len)
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{
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for (int i = 0; i < len; i++) {
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mac_real_vec_n(&x[2 * (i - (h_len - 1) + start)],
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h,
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&y[2 * i], h_len);
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}
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return len;
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}
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/* Base complex-complex convolution */
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int _base_convolve_complex(const float *x, int x_len,
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const float *h, int h_len,
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float *y, int y_len,
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int start, int len)
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{
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for (int i = 0; i < len; i++) {
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mac_cmplx_vec_n(&x[2 * (i - (h_len - 1) + start)],
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h,
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&y[2 * i],
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h_len);
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}
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return len;
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}
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/* Buffer validity checks */
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int bounds_check(int x_len, int h_len, int y_len,
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int start, int len)
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{
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if ((x_len < 1) || (h_len < 1) ||
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(y_len < 1) || (len < 1)) {
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fprintf(stderr, "Convolve: Invalid input\n");
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return -1;
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}
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if ((start + len > x_len) || (len > y_len) || (x_len < h_len)) {
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fprintf(stderr, "Convolve: Boundary exception\n");
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fprintf(stderr, "start: %i, len: %i, x: %i, h: %i, y: %i\n",
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start, len, x_len, h_len, y_len);
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return -1;
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}
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return 0;
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}
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/* API: Non-aligned (no SSE) complex-real */
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int base_convolve_real(const float *x, int x_len,
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const float *h, int h_len,
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float *y, int y_len,
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int start, int len)
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{
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if (bounds_check(x_len, h_len, y_len, start, len) < 0)
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return -1;
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memset(y, 0, len * 2 * sizeof(float));
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return _base_convolve_real(x, x_len,
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h, h_len,
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y, y_len,
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start, len);
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}
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/* API: Non-aligned (no SSE) complex-complex */
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int base_convolve_complex(const float *x, int x_len,
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const float *h, int h_len,
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float *y, int y_len,
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int start, int len)
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{
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if (bounds_check(x_len, h_len, y_len, start, len) < 0)
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return -1;
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memset(y, 0, len * 2 * sizeof(float));
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return _base_convolve_complex(x, x_len,
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h, h_len,
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y, y_len,
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start, len);
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}
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/* Aligned filter tap allocation */
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void *convolve_h_alloc(size_t len)
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{
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#ifdef HAVE_SSE3
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return memalign(16, len * 2 * sizeof(float));
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#else
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return malloc(len * 2 * sizeof(float));
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#endif
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}
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