2 * Copyright (C) 2013-2014 Robin Gareus <robin@gareus.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include "ardour/mididm.h"
20 #include "ardour/port_engine.h"
22 using namespace ARDOUR;
24 MIDIDM::MIDIDM (framecnt_t sample_rate)
25 : _sample_rate (sample_rate)
26 , _monotonic_cnt (sample_rate)
27 , _last_signal_tme (0)
30 , _min_delay (INT32_MAX)
40 int MIDIDM::process (pframes_t nframes, PortEngine &pe, void *midi_in, void *midi_out)
45 obuf[1] = (_monotonic_cnt) & 0x7f;
46 obuf[2] = (_monotonic_cnt >> 7) & 0x7f;
48 pe.midi_clear(midi_out);
49 pe.midi_event_put (midi_out, 0, obuf, 3);
51 /* process incoming */
52 const pframes_t nevents = pe.get_midi_event_count (midi_in);
54 printf("MIDI SEND: @%8"PRId64", recv: %d systime:%"PRId64"\n", _monotonic_cnt, nevents, g_get_monotonic_time());
56 for (pframes_t n = 0; n < nevents; ++n) {
60 pe.midi_event_get (timestamp, size, &buf, midi_in, n);
62 if (size != 3 || buf[0] != 0xf2 ) continue;
64 _last_signal_tme = _monotonic_cnt;
66 /* calculate time difference */
67 #define MODX (16384) // 1<<(2*7)
68 #define MASK (0x3fff) // MODX - 1
69 const int64_t tc = (_monotonic_cnt + timestamp) & MASK;
70 const int64_t ti = ((buf[2] & 0x7f) << 7) | (buf[1] & 0x7f);
71 const int64_t tdiff = (MODX + tc - ti) % MODX;
73 printf("MIDI DELAY: # %5"PRId64" %5"PRId64" [samples] (%5"PRId64" - %8"PRId64") @(%5"PRId64" + %d)\n",
74 _cnt_total, tdiff, tc, ti, _monotonic_cnt, timestamp);
77 /* running variance */
78 if (_cnt_total == 0) {
81 const double var_m1 = _var_m;
82 _var_m = _var_m + ((double)tdiff - _var_m) / (double)(_cnt_total + 1);
83 _var_s = _var_s + ((double)tdiff - _var_m) * ((double)tdiff - var_m1);
85 /* average and mix/max */
88 _avg_delay = _dly_total / _cnt_total;
89 if (tdiff < _min_delay) _min_delay = tdiff;
90 if (tdiff > _max_delay) _max_delay = tdiff;
93 _monotonic_cnt += nframes;