Osmocom GSM/GPRS/EGPRS transceiver, originally forked from OpenBTS transceiver. For building SDR based GSM BTS with osmo-bts-trx.
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 
osmo-trx/Transceiver52M/arch/arm/convert.c

83 lines
2.1 KiB

/*
* NEON type conversions
* Copyright (C) 2012, 2013 Thomas Tsou <tom@tsou.cc>
*
* SPDX-License-Identifier: LGPL-2.1+
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#include <malloc.h>
#include <string.h>
#include "convert.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
void neon_convert_ps_si16_4n(short *, const float *, const float *, int);
void neon_convert_si16_ps_4n(float *, const short *, int);
void convert_init(void) {
}
/* 4*N 16-bit signed integer conversion with remainder */
static void neon_convert_si16_ps(float *out,
const short *in,
int len)
{
int start = len / 4 * 4;
neon_convert_si16_ps_4n(out, in, len >> 2);
for (int i = 0; i < len % 4; i++)
out[start + i] = (float) in[start + i];
}
/* 4*N 16-bit signed integer conversion with remainder */
static void neon_convert_ps_si16(short *out,
const float *in,
const float *scale,
int len)
{
int start = len / 4 * 4;
neon_convert_ps_si16_4n(out, in, scale, len >> 2);
for (int i = 0; i < len % 4; i++)
out[start + i] = (short) (in[start + i] * (*scale));
}
void convert_float_short(short *out, const float *in, float scale, int len)
{
#ifdef HAVE_NEON
float q[4] = { scale, scale, scale, scale };
if (len % 4)
neon_convert_ps_si16(out, in, q, len);
else
neon_convert_ps_si16_4n(out, in, q, len >> 2);
#else
base_convert_float_short(out, in, scale, len);
#endif
}
void convert_short_float(float *out, const short *in, int len)
{
#ifdef HAVE_NEON
if (len % 4)
neon_convert_si16_ps(out, in, len);
else
neon_convert_si16_ps_4n(out, in, len >> 2);
#else
base_convert_short_float(out, in, len);
#endif
}