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sdrangel/wdsp/siphon.cpp

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/* siphon.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2013 Warren Pratt, NR0V
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
The author can be reached by email at
warren@wpratt.com
*/
#include "comm.hpp"
#include "meterlog10.hpp"
#include "siphon.hpp"
#include "RXA.hpp"
#include "TXA.hpp"
namespace WDSP {
void SIPHON::build_window (SIPHON *a)
{
int i;
float arg0, cosphi;
float sum, scale;
arg0 = 2.0 * PI / ((float)a->fftsize - 1.0);
sum = 0.0;
for (i = 0; i < a->fftsize; i++)
{
cosphi = cos (arg0 * (float)i);
a->window[i] = + 6.3964424114390378e-02
+ cosphi * ( - 2.3993864599352804e-01
+ cosphi * ( + 3.5015956323820469e-01
+ cosphi * ( - 2.4774111897080783e-01
+ cosphi * ( + 8.5438256055858031e-02
+ cosphi * ( - 1.2320203369293225e-02
+ cosphi * ( + 4.3778825791773474e-04 ))))));
sum += a->window[i];
}
scale = 1.0 / sum;
for (i = 0; i < a->fftsize; i++)
a->window[i] *= scale;
}
SIPHON* SIPHON::create_siphon (
int run,
int position,
int mode,
int disp,
int insize,
float* in,
int sipsize,
int fftsize,
int specmode
)
{
SIPHON *a = new SIPHON;
a->run = run;
a->position = position;
a->mode = mode;
a->disp = disp;
a->insize = insize;
a->in = in;
a->sipsize = sipsize; // NOTE: sipsize MUST BE A POWER OF TWO!!
a->fftsize = fftsize;
a->specmode = specmode;
a->sipbuff = new float[a->sipsize * 2]; // (float *) malloc0 (a->sipsize * sizeof (complex));
a->idx = 0;
a->sipout = new float[a->sipsize * 2]; // (float *) malloc0 (a->sipsize * sizeof (complex));
a->specout = new float[a->fftsize * 2]; // (float *) malloc0 (a->fftsize * sizeof (complex));
a->sipplan = fftwf_plan_dft_1d (a->fftsize, (fftwf_complex *)a->sipout, (fftwf_complex *)a->specout, FFTW_FORWARD, FFTW_PATIENT);
a->window = new float[a->fftsize * 2]; // (float *) malloc0 (a->fftsize * sizeof (complex));
build_window (a);
return a;
}
void SIPHON::destroy_siphon (SIPHON *a)
{
fftwf_destroy_plan (a->sipplan);
delete[] (a->window);
delete[] (a->specout);
delete[] (a->sipout);
delete[] (a->sipbuff);
delete (a);
}
void SIPHON::flush_siphon (SIPHON *a)
{
std::fill(a->sipbuff, a->sipbuff + a->sipsize * 2, 0);
std::fill(a->sipout, a->sipout + a->sipsize * 2, 0);
std::fill(a->specout, a->specout + a->fftsize * 2, 0);
a->idx = 0;
}
void SIPHON::xsiphon (SIPHON *a, int pos)
{
int first, second;
if (a->run && a->position == pos)
{
switch (a->mode)
{
case 0:
if (a->insize >= a->sipsize)
std::copy(&(a->in[2 * (a->insize - a->sipsize)]), &(a->in[2 * (a->insize - a->sipsize)]) + a->sipsize * 2, a->sipbuff);
else
{
if (a->insize > (a->sipsize - a->idx))
{
first = a->sipsize - a->idx;
second = a->insize - first;
}
else
{
first = a->insize;
second = 0;
}
std::copy(a->in, a->in + first * 2, a->sipbuff + 2 * a->idx);
std::copy(a->in + 2 * first, a->in + 2 * first + second * 2, a->sipbuff);
if ((a->idx += a->insize) >= a->sipsize) a->idx -= a->sipsize;
}
break;
case 1:
// Spectrum0 (1, a->disp, 0, 0, a->in);
break;
}
}
}
void SIPHON::setBuffers_siphon (SIPHON *a, float* in)
{
a->in = in;
}
void SIPHON::setSamplerate_siphon (SIPHON *a, int)
{
flush_siphon (a);
}
void SIPHON::setSize_siphon (SIPHON *a, int size)
{
a->insize = size;
flush_siphon (a);
}
void SIPHON::suck (SIPHON *a)
{
if (a->outsize <= a->sipsize)
{
int mask = a->sipsize - 1;
int j = (a->idx - a->outsize) & mask;
int size = a->sipsize - j;
if (size >= a->outsize)
std::copy(&(a->sipbuff[2 * j]), &(a->sipbuff[2 * j]) + a->outsize * 2, a->sipout);
else
{
std::copy(&(a->sipbuff[2 * j]), &(a->sipbuff[2 * j]) + size * 2, a->sipout);
std::copy(a->sipbuff, a->sipbuff + (a->outsize - size) * 2, &(a->sipout[2 * size]));
}
}
}
void SIPHON::sip_spectrum (SIPHON *a)
{
int i;
for (i = 0; i < a->fftsize; i++)
{
a->sipout[2 * i + 0] *= a->window[i];
a->sipout[2 * i + 1] *= a->window[i];
}
fftwf_execute (a->sipplan);
}
/********************************************************************************************************
* *
* RXA Properties *
* *
********************************************************************************************************/
void SIPHON::GetaSipF (RXA& rxa, float* out, int size)
{ // return raw samples as floats
SIPHON *a=rxa.sip1;
int i;
a->outsize = size;
suck (a);
for (i = 0; i < size; i++) {
out[i] = (float)a->sipout[2 * i + 0];
}
}
void SIPHON::GetaSipF1 (RXA& rxa, float* out, int size)
{ // return raw samples as floats
SIPHON *a=rxa.sip1;
int i;
a->outsize = size;
suck (a);
for (i = 0; i < size; i++)
{
out[2 * i + 0] = (float)a->sipout[2 * i + 0];
out[2 * i + 1] = (float)a->sipout[2 * i + 1];
}
}
/********************************************************************************************************
* *
* TXA Properties *
* *
********************************************************************************************************/
void SIPHON::SetSipPosition (TXA& txa, int pos)
{
SIPHON *a = txa.sip1;
a->position = pos;
}
void SIPHON::SetSipMode (TXA& txa, int mode)
{
SIPHON *a = txa.sip1;
a->mode = mode;
}
void SIPHON::SetSipDisplay (TXA& txa, int disp)
{
SIPHON *a = txa.sip1;
a->disp = disp;
}
void SIPHON::GetaSipF (TXA& txa, float* out, int size)
{ // return raw samples as floats
SIPHON *a = txa.sip1;
int i;
a->outsize = size;
suck (a);
for (i = 0; i < size; i++) {
out[i] = (float)a->sipout[2 * i + 0];
}
}
void SIPHON::GetaSipF1 (TXA& txa, float* out, int size)
{ // return raw samples as floats
SIPHON *a = txa.sip1;
int i;
a->outsize = size;
suck (a);
for (i = 0; i < size; i++)
{
out[2 * i + 0] = (float)a->sipout[2 * i + 0];
out[2 * i + 1] = (float)a->sipout[2 * i + 1];
}
}
void SIPHON::SetSipSpecmode (TXA& txa, int mode)
{
SIPHON *a = txa.sip1;
if (mode == 0)
a->specmode = 0;
else
a->specmode = 1;
}
void SIPHON::GetSpecF1 (TXA& txa, float* out)
{ // return spectrum magnitudes in dB
SIPHON *a = txa.sip1;
int i, j, mid, m, n;
a->outsize = a->fftsize;
suck (a);
sip_spectrum (a);
mid = a->fftsize / 2;
if (a->specmode != 1)
{
// swap the halves of the spectrum
for (i = 0, j = mid; i < mid; i++, j++)
{
out[i] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * j + 0] * a->specout[2 * j + 0] + a->specout[2 * j + 1] * a->specout[2 * j + 1] + 1.0e-60));
out[j] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * i + 0] * a->specout[2 * i + 0] + a->specout[2 * i + 1] * a->specout[2 * i + 1] + 1.0e-60));
}
}
else
{
// mirror each half of the spectrum in-place
for (i = 0, j = mid - 1, m = mid, n = a->fftsize - 1; i < mid; i++, j--, m++, n--)
{
out[i] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * j + 0] * a->specout[2 * j + 0] + a->specout[2 * j + 1] * a->specout[2 * j + 1] + 1.0e-60));
out[m] = (float)(10.0 * MemLog::mlog10 (a->specout[2 * n + 0] * a->specout[2 * n + 0] + a->specout[2 * n + 1] * a->specout[2 * n + 1] + 1.0e-60));
}
}
}
/********************************************************************************************************
* *
* CALLS FOR EXTERNAL USE *
* *
********************************************************************************************************/
/*
#define MAX_EXT_SIPHONS (2) // maximum number of Siphons called from outside wdsp
__declspec (align (16)) SIPHON psiphon[MAX_EXT_SIPHONS]; // array of pointers for Siphons used EXTERNAL to wdsp
PORT
void create_siphonEXT (int id, int run, int insize, int sipsize, int fftsize, int specmode)
{
psiphon[id] = create_siphon (run, 0, 0, 0, insize, 0, sipsize, fftsize, specmode);
}
PORT
void destroy_siphonEXT (int id)
{
destroy_siphon (psiphon[id]);
}
PORT
void flush_siphonEXT (int id)
{
flush_siphon (psiphon[id]);
}
PORT
void xsiphonEXT (int id, float* buff)
{
SIPHON a = psiphon[id];
a->in = buff;
xsiphon (a, 0);
}
PORT
void GetaSipF1EXT (int id, float* out, int size)
{ // return raw samples as floats
SIPHON a = psiphon[id];
int i;
a->update.lock();
a->outsize = size;
suck (a);
a->update.unlock();
for (i = 0; i < size; i++)
{
out[2 * i + 0] = (float)a->sipout[2 * i + 0];
out[2 * i + 1] = (float)a->sipout[2 * i + 1];
}
}
PORT
void SetSiphonInsize (int id, int size)
{
SIPHON a = psiphon[id];
a->update.lock();
a->insize = size;
a->update.unlock();
}
*/
} // namespace WDSP
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