diff options
Diffstat (limited to 'dll/src/zita-resampler/libs/resampler.cc')
| -rw-r--r-- | dll/src/zita-resampler/libs/resampler.cc | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/dll/src/zita-resampler/libs/resampler.cc b/dll/src/zita-resampler/libs/resampler.cc deleted file mode 100644 index 0365f90..0000000 --- a/dll/src/zita-resampler/libs/resampler.cc +++ /dev/null @@ -1,263 +0,0 @@ -// ----------------------------------------------------------------------------
-//
-// Copyright (C) 2006-2012 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/resampler.h>
-
-
-static unsigned int gcd (unsigned int a, unsigned int b)
-{
- if (a == 0) return b;
- if (b == 0) return a;
- while (1)
- {
- if (a > b)
- {
- a = a % b;
- if (a == 0) return b;
- if (a == 1) return 1;
- }
- else
- {
- b = b % a;
- if (b == 0) return a;
- if (b == 1) return 1;
- }
- }
- return 1;
-}
-
-
-Resampler::Resampler (void) :
- _table (0),
- _nchan (0),
- _buff (0)
-{
- reset ();
-}
-
-
-Resampler::~Resampler (void)
-{
- clear ();
-}
-
-
-int Resampler::setup (unsigned int fs_inp,
- unsigned int fs_out,
- unsigned int nchan,
- unsigned int hlen)
-{
- if ((hlen < 8) || (hlen > 96)) return 1;
- return setup (fs_inp, fs_out, nchan, hlen, 1.0 - 2.6 / hlen);
-}
-
-
-int Resampler::setup (unsigned int fs_inp,
- unsigned int fs_out,
- unsigned int nchan,
- unsigned int hlen,
- double frel)
-{
- unsigned int g, h, k, n, s;
- double r;
- float *B = 0;
- Resampler_table *T = 0;
-
- k = s = 0;
- if (fs_inp && fs_out && nchan)
- {
- r = (double) fs_out / (double) fs_inp;
- g = gcd (fs_out, fs_inp);
- n = fs_out / g;
- s = fs_inp / g;
- if ((16 * r >= 1) && (n <= 1000))
- {
- h = hlen;
- k = 250;
- if (r < 1)
- {
- frel *= r;
- h = (unsigned int)(ceil (h / r));
- k = (unsigned int)(ceil (k / r));
- }
- T = Resampler_table::create (frel, h, n);
- B = new float [nchan * (2 * h - 1 + k)];
- }
- }
- clear ();
- if (T)
- {
- _table = T;
- _buff = B;
- _nchan = nchan;
- _inmax = k;
- _pstep = s;
- return reset ();
- }
- else return 1;
-}
-
-
-void Resampler::clear (void)
-{
- Resampler_table::destroy (_table);
- delete[] _buff;
- _buff = 0;
- _table = 0;
- _nchan = 0;
- _inmax = 0;
- _pstep = 0;
- reset ();
-}
-
-
-double Resampler::inpdist (void) const
-{
- if (!_table) return 0;
- return (int)(_table->_hl + 1 - _nread) - (double)_phase / _table->_np;
-}
-
-
-int Resampler::inpsize (void) const
-{
- if (!_table) return 0;
- return 2 * _table->_hl;
-}
-
-
-int Resampler::reset (void)
-{
- if (!_table) return 1;
-
- inp_count = 0;
- out_count = 0;
- inp_data = 0;
- out_data = 0;
- _index = 0;
- _nread = 0;
- _nzero = 0;
- _phase = 0;
- if (_table)
- {
- _nread = 2 * _table->_hl;
- return 0;
- }
- return 1;
-}
-
-
-int Resampler::process (void)
-{
- unsigned int hl, ph, np, dp, in, nr, nz, i, n, c;
- float *p1, *p2;
-
- if (!_table) return 1;
-
- hl = _table->_hl;
- np = _table->_np;
- dp = _pstep;
- in = _index;
- nr = _nread;
- ph = _phase;
- nz = _nzero;
- n = (2 * hl - nr) * _nchan;
- p1 = _buff + in * _nchan;
- p2 = p1 + n;
-
- while (out_count)
- {
- if (nr)
- {
- if (inp_count == 0) break;
- if (inp_data)
- {
- for (c = 0; c < _nchan; c++) p2 [c] = inp_data [c];
- inp_data += _nchan;
- nz = 0;
- }
- else
- {
- for (c = 0; c < _nchan; c++) p2 [c] = 0;
- if (nz < 2 * hl) nz++;
- }
- nr--;
- p2 += _nchan;
- inp_count--;
- }
- else
- {
- if (out_data)
- {
- if (nz < 2 * hl)
- {
- float *c1 = _table->_ctab + hl * ph;
- float *c2 = _table->_ctab + hl * (np - ph);
- for (c = 0; c < _nchan; c++)
- {
- float *q1 = p1 + c;
- float *q2 = p2 + c;
- float s = 1e-20f;
- for (i = 0; i < hl; i++)
- {
- q2 -= _nchan;
- s += *q1 * c1 [i] + *q2 * c2 [i];
- q1 += _nchan;
- }
- *out_data++ = s - 1e-20f;
- }
- }
- else
- {
- for (c = 0; c < _nchan; c++) *out_data++ = 0;
- }
- }
- out_count--;
-
- ph += dp;
- if (ph >= np)
- {
- nr = ph / np;
- ph -= nr * np;
- in += nr;
- p1 += nr * _nchan;;
- if (in >= _inmax)
- {
- n = (2 * hl - nr) * _nchan;
- memcpy (_buff, p1, n * sizeof (float));
- in = 0;
- p1 = _buff;
- p2 = p1 + n;
- }
- }
- }
- }
- _index = in;
- _nread = nr;
- _phase = ph;
- _nzero = nz;
-
- return 0;
-}
-
-
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