178 lines
3.2 KiB
C++
178 lines
3.2 KiB
C++
// ----------------------------------------------------------------------------
|
|
//
|
|
// Copyright (C) 2013 Fons Adriaensen <fons@linuxaudio.org>
|
|
//
|
|
// 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 3 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, see <http://www.gnu.org/licenses/>.
|
|
//
|
|
// ----------------------------------------------------------------------------
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#include "zita-resampler/cresampler.h"
|
|
|
|
using namespace ArdourZita;
|
|
|
|
CResampler::CResampler (void)
|
|
: _nchan (0)
|
|
, _buff (0)
|
|
{
|
|
reset ();
|
|
}
|
|
|
|
CResampler::~CResampler (void)
|
|
{
|
|
clear ();
|
|
}
|
|
|
|
int
|
|
CResampler::setup (double ratio,
|
|
unsigned int nchan)
|
|
{
|
|
if (! nchan) return 1;
|
|
clear ();
|
|
_inmax = 50;
|
|
_buff = new float [nchan * (3 + _inmax)];
|
|
_nchan = nchan;
|
|
_pstep = 1 / ratio;
|
|
return reset ();
|
|
}
|
|
|
|
void
|
|
CResampler::clear (void)
|
|
{
|
|
delete[] _buff;
|
|
_buff = 0;
|
|
_nchan = 0;
|
|
_inmax = 0;
|
|
_pstep = 0;
|
|
reset ();
|
|
}
|
|
|
|
void
|
|
CResampler::set_phase (double p)
|
|
{
|
|
_phase = p - floor (p);
|
|
}
|
|
|
|
void
|
|
CResampler::set_ratio (double r)
|
|
{
|
|
_pstep = 1.0 / r;
|
|
}
|
|
|
|
double
|
|
CResampler::inpdist (void) const
|
|
{
|
|
return (int)(3 - _nread) - _phase;
|
|
}
|
|
|
|
int
|
|
CResampler::inpsize (void) const
|
|
{
|
|
return 4;
|
|
}
|
|
|
|
int
|
|
CResampler::reset (void)
|
|
{
|
|
inp_count = 0;
|
|
out_count = 0;
|
|
inp_data = 0;
|
|
out_data = 0;
|
|
_index = 0;
|
|
_phase = 0;
|
|
_nread = 4;
|
|
_nzero = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
CResampler::process (void)
|
|
{
|
|
unsigned int in, nr, n, c;
|
|
int nz;
|
|
double ph;
|
|
float *pb, a, b, d, m0, m1, m2, m3;
|
|
|
|
in = _index;
|
|
nr = _nread;
|
|
nz = _nzero;
|
|
ph = _phase;
|
|
pb = _buff + in * _nchan;
|
|
|
|
while (out_count) {
|
|
if (nr) {
|
|
if (inp_count == 0) break;
|
|
n = (4 - nr) * _nchan;
|
|
if (inp_data) {
|
|
for (c = 0; c < _nchan; c++) pb [n + c] = inp_data [c];
|
|
inp_data += _nchan;
|
|
nz = 0;
|
|
} else {
|
|
for (c = 0; c < _nchan; c++) pb [n + c] = 0;
|
|
if (nz < 4) nz++;
|
|
}
|
|
nr--;
|
|
inp_count--;
|
|
} else {
|
|
n = _nchan;
|
|
if (out_data) {
|
|
if (nz < 4) {
|
|
a = ph;
|
|
b = 1 - a;
|
|
d = a * b / 2;
|
|
m0 = -d * b;
|
|
m1 = b + (3 * b - 1) * d;
|
|
m2 = a + (3 * a - 1) * d;
|
|
m3 = -d * a;
|
|
for (c = 0; c < n; c++) {
|
|
*out_data++ = m0 * pb [0]
|
|
+ m1 * pb [n]
|
|
+ m2 * pb [2 * n]
|
|
+ m3 * pb [3 * n];
|
|
pb++;
|
|
}
|
|
pb -= n;
|
|
} else {
|
|
for (c = 0; c < n; c++) *out_data++ = 0;
|
|
}
|
|
}
|
|
out_count--;
|
|
|
|
ph += _pstep;
|
|
if (ph >= 1.0) {
|
|
nr = (unsigned int) floor (ph);
|
|
ph -= nr;
|
|
in += nr;
|
|
pb += nr * _nchan;
|
|
if (in >= _inmax) {
|
|
memcpy (_buff, pb, (4 - nr) * _nchan * sizeof (float));
|
|
in = 0;
|
|
pb = _buff;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
_index = in;
|
|
_nread = nr;
|
|
_nzero = nz;
|
|
_phase = ph;
|
|
|
|
return 0;
|
|
}
|