57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
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/*
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* NEON scaling
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* Copyright (C) 2012,2013 Thomas Tsou <tom@tsou.cc>
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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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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <malloc.h>
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#include <string.h>
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#include <scale.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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void neon_scale_4n(float *, float *, float *, int);
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static void scale_ps(float *out, float *in, float *scale, int len)
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{
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float ai, aq, bi, bq;
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bi = scale[0];
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bq = scale[1];
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for (int i = 0; i < len; i++) {
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ai = in[2 * i + 0];
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aq = in[2 * i + 1];
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out[2 * i + 0] = ai * bi - aq * bq;
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out[2 * i + 1] = ai * bq + aq * bi;
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}
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}
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void scale_complex(float *out, float *in, float* scale, int len)
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{
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#ifdef HAVE_NEON
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if (len % 4)
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scale_ps(out, in, scale, len);
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else
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neon_scale_4n(in, scale, out, len >> 2);
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#else
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scale_ps(out, in, scale, len);
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#endif
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}
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