138 lines
2.9 KiB
C++
138 lines
2.9 KiB
C++
/*
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* Copyright (C) 2003-2012 Fons Adriaensen <fons@kokkinizita.net>
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* Copyright (C) 2009-2012 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2015 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2016 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <assert.h>
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#include <math.h>
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#include "ardour/mtdm.h"
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MTDM::MTDM (int fsamp)
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: _cnt (0)
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, _inv (0)
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, _peak (0)
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{
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int i;
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Freq* F;
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_freq[0].f = 4096;
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_freq[1].f = 2048;
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_freq[2].f = 3072;
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_freq[3].f = 2560;
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_freq[4].f = 2304;
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_freq[5].f = 2176;
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_freq[6].f = 1088;
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_freq[7].f = 1312;
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_freq[8].f = 1552;
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_freq[9].f = 1800;
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_freq[10].f = 3332;
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_freq[11].f = 3586;
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_freq[12].f = 3841;
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_wlp = 200.0f / fsamp;
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for (i = 0, F = _freq; i < 13; i++, F++) {
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F->p = 128;
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F->xa = F->ya = 0.0f;
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F->x1 = F->y1 = 0.0f;
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F->x2 = F->y2 = 0.0f;
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}
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}
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int
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MTDM::process (size_t len, float* ip, float* op)
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{
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int i;
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float vip, vop, a, c, s;
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Freq* F;
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float peak = 0;
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assert (len > 0);
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while (len--) {
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vop = 0.0f;
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vip = *ip++;
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if (fabsf (vip) > peak) {
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peak = vip;
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}
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for (i = 0, F = _freq; i < 13; i++, F++) {
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a = 2 * (float)M_PI * (F->p & 65535) / 65536.0;
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F->p += F->f;
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c = cosf (a);
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s = -sinf (a);
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vop += (i ? 0.01f : 0.20f) * s;
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F->xa += s * vip;
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F->ya += c * vip;
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}
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*op++ = vop;
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if (++_cnt == 16) {
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for (i = 0, F = _freq; i < 13; i++, F++) {
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F->x1 += _wlp * (F->xa - F->x1 + 1e-20);
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F->y1 += _wlp * (F->ya - F->y1 + 1e-20);
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F->x2 += _wlp * (F->x1 - F->x2 + 1e-20);
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F->y2 += _wlp * (F->y1 - F->y2 + 1e-20);
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F->xa = F->ya = 0.0f;
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}
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_cnt = 0;
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}
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}
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if (peak > _peak) {
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_peak = vip;
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}
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return 0;
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}
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int
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MTDM::resolve (void)
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{
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int i, k, m;
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double d, e, f0, p;
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Freq* F = _freq;
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if (hypot (F->x2, F->y2) < 0.001)
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return -1;
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d = atan2 (F->y2, F->x2) / (2 * M_PI);
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if (_inv)
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d += 0.5;
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if (d > 0.5)
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d -= 1.0;
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f0 = _freq[0].f;
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m = 1;
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_err = 0.0;
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for (i = 0; i < 12; i++) {
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F++;
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p = atan2 (F->y2, F->x2) / (2 * M_PI) - d * F->f / f0;
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if (_inv)
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p += 0.5;
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p -= floor (p);
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p *= 2;
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k = (int)(floor (p + 0.5));
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e = fabs (p - k);
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if (e > _err)
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_err = e;
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if (e > 0.4)
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return 1;
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d += m * (k & 1);
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m *= 2;
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}
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_del = 16 * d;
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return 0;
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}
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