89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
/*
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* Copyright (C) 2013-2014 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
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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/mididm.h"
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#include "ardour/port_engine.h"
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using namespace ARDOUR;
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MIDIDM::MIDIDM (framecnt_t sample_rate)
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: _sample_rate (sample_rate)
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, _monotonic_cnt (sample_rate)
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, _last_signal_tme (0)
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, _cnt_total (0)
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, _dly_total (0)
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, _min_delay (INT32_MAX)
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, _max_delay (0)
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, _avg_delay (0)
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, _var_m (0)
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, _var_s (0)
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{
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}
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int MIDIDM::process (pframes_t nframes, PortEngine &pe, void *midi_in, void *midi_out)
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{
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/* send midi event */
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uint8_t obuf[3];
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obuf[0] = 0xf2;
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obuf[1] = (_monotonic_cnt) & 0x7f;
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obuf[2] = (_monotonic_cnt >> 7) & 0x7f;
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pe.midi_clear(midi_out);
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pe.midi_event_put (midi_out, 0, obuf, 3);
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/* process incoming */
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const pframes_t nevents = pe.get_midi_event_count (midi_in);
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for (pframes_t n = 0; n < nevents; ++n) {
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pframes_t timestamp;
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size_t size;
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uint8_t* buf;
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pe.midi_event_get (timestamp, size, &buf, midi_in, n);
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if (size != 3 || buf[0] != 0xf2 ) continue;
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_last_signal_tme = _monotonic_cnt;
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/* calculate time difference */
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#define MODX (16384) // 1<<(2*7)
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#define MASK (0x3fff) // MODX - 1
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const int64_t tc = (_monotonic_cnt + timestamp) & MASK;
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const int64_t ti = (buf[2] << 7) | buf[1];
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const int64_t tdiff = (MODX + tc - ti) % MODX;
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/* running variance */
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if (_cnt_total == 0) {
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_var_m = tdiff;
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} else {
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const double var_m1 = _var_m;
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_var_m = _var_m + ((double)tdiff - _var_m) / (double)(_cnt_total + 1);
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_var_s = _var_s + ((double)tdiff - _var_m) * ((double)tdiff - var_m1);
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}
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/* average and mix/max */
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++_cnt_total;
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_dly_total += tdiff;
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_avg_delay = _dly_total / _cnt_total;
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if (tdiff < _min_delay) _min_delay = tdiff;
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if (tdiff > _max_delay) _max_delay = tdiff;
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}
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_monotonic_cnt += nframes;
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return 0;
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}
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