133 lines
2.4 KiB
C++
133 lines
2.4 KiB
C++
/*
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Copyright (C) 2003-2008 Fons Adriaensen <fons@kokkinizita.net>
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <ardour/mtdm.h>
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MTDM::MTDM (void)
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: _cnt (0)
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, _inv (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 = 512;
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_freq [2].f = 1088;
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_freq [3].f = 1544;
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_freq [4].f = 2049;
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_freq [0].a = 0.2f;
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_freq [1].a = 0.1f;
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_freq [2].a = 0.1f;
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_freq [3].a = 0.1f;
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_freq [4].a = 0.1f;
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for (i = 0, F = _freq; i < 5; i++, F++) {
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F->p = 128;
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F->xa = F->ya = 0.0f;
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F->xf = F->yf = 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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while (len--)
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{
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vop = 0.0f;
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vip = *ip++;
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for (i = 0, F = _freq; i < 5; i++, F++)
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{
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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 += F->a * 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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{
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for (i = 0, F = _freq; i < 5; i++, F++)
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{
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F->xf += 1e-3f * (F->xa - F->xf + 1e-20);
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F->yf += 1e-3f * (F->ya - F->yf + 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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return 0;
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}
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int
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MTDM::resolve ()
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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->xf, F->yf) < 0.01) {
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return -1;
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}
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d = atan2 (F->yf, F->xf) / (2 * M_PI);
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if (_inv) {
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d += 0.5f;
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}
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if (d > 0.5f) {
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d -= 1.0f;
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}
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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 < 4; i++) {
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F++;
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p = atan2 (F->yf, F->xf) / (2 * M_PI) - d * F->f / f0;
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if (_inv) {
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p += 0.5f;
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}
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p -= floor (p);
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p *= 8;
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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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}
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if (e > 0.4) {
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return 1;
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}
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d += m * (k & 7);
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m *= 8;
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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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