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prepare midi-latency measurement using sysex messages

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This commit is contained in:
Robin Gareus 2014-06-17 16:15:16 +02:00
parent 1f46e75ac9
commit b4dd5b737f
2 changed files with 62 additions and 15 deletions
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2
libs/ardour/ardour/mididm.h
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@ -41,6 +41,8 @@ public:
bool have_signal (void) { return (_monotonic_cnt - _last_signal_tme) < (uint64_t) _sample_rate ; }
private:
int64_t parse_mclk (uint8_t* buf, pframes_t timestamp) const;
int64_t parse_mtc (uint8_t* buf, pframes_t timestamp) const;
framecnt_t _sample_rate;

75
libs/ardour/mididm.cc
View File

@ -36,44 +36,89 @@ MIDIDM::MIDIDM (framecnt_t sample_rate)
}
int64_t
MIDIDM::parse_mclk (uint8_t* buf, pframes_t timestamp) const
{
/* calculate time difference */
#define MODCLK (16384) // 1<<(2*7)
const int64_t tc = (_monotonic_cnt + timestamp) & 0x3fff; // MODCLK - 1;
const int64_t ti = ((buf[2] & 0x7f) << 7) | (buf[1] & 0x7f);
const int64_t tdiff = (MODCLK + tc - ti) % MODCLK;
#ifdef DEBUG_MIDIDM
printf("MCLK DELAY: # %5"PRId64" %5"PRId64" [samples] (%5"PRId64" - %8"PRId64") @(%5"PRId64" + %d)\n",
_cnt_total, tdiff, tc, ti, _monotonic_cnt, timestamp);
#endif
return tdiff;
}
int64_t
MIDIDM::parse_mtc (uint8_t* buf, pframes_t timestamp) const
{
#define MODTC (2097152) // 1<<(3*7)
const int64_t tc = (_monotonic_cnt + timestamp) & 0x001FFFFF;
const int64_t ti = (buf[5] & 0x7f)
| ((buf[6] & 0x7f) << 7)
| ((buf[7] & 0x7f) << 14)
| ((buf[8] & 0x7f) << 21);
const int64_t tdiff = (MODTC + tc - ti) % MODTC;
#ifdef DEBUG_MIDIDM
printf("MTC DELAY: # %5"PRId64" %5"PRId64" [samples] (%5"PRId64" - %8"PRId64") @(%5"PRId64" + %d)\n",
_cnt_total, tdiff, tc, ti, _monotonic_cnt, timestamp);
#endif
return tdiff;
}
int MIDIDM::process (pframes_t nframes, PortEngine &pe, void *midi_in, void *midi_out)
{
/* send midi event */
pe.midi_clear(midi_out);
#ifndef USE_MTC // use 3-byte song position
uint8_t obuf[3];
obuf[0] = 0xf2;
obuf[1] = (_monotonic_cnt) & 0x7f;
obuf[2] = (_monotonic_cnt >> 7) & 0x7f;
pe.midi_clear(midi_out);
pe.midi_event_put (midi_out, 0, obuf, 3);
#else // sysex MTC frame
uint8_t obuf[9];
obuf[0] = 0xf0;
obuf[1] = 0x7f;
obuf[2] = 0x7f;
obuf[3] = 0x01;
obuf[4] = 0x01;
obuf[9] = 0xf7;
obuf[5] = (_monotonic_cnt ) & 0x7f;
obuf[6] = (_monotonic_cnt >> 7) & 0x7f;
obuf[7] = (_monotonic_cnt >> 14) & 0x7f;
obuf[8] = (_monotonic_cnt >> 21) & 0x7f;
pe.midi_event_put (midi_out, 0, obuf, 10);
#endif
/* process incoming */
const pframes_t nevents = pe.get_midi_event_count (midi_in);
#if 0 //DEBUG
#ifdef DEBUG_MIDIDM
printf("MIDI SEND: @%8"PRId64", recv: %d systime:%"PRId64"\n", _monotonic_cnt, nevents, g_get_monotonic_time());
#endif
for (pframes_t n = 0; n < nevents; ++n) {
pframes_t timestamp;
size_t size;
uint8_t* buf;
int64_t tdiff;
pe.midi_event_get (timestamp, size, &buf, midi_in, n);
if (size != 3 || buf[0] != 0xf2 ) continue;
if (size == 3 && buf[0] == 0xf2 )
{
tdiff = parse_mclk(buf, timestamp);
} else if (size == 10 && buf[0] == 0xf0)
{
tdiff = parse_mtc(buf, timestamp);
}
else
{
continue;
}
_last_signal_tme = _monotonic_cnt;
/* calculate time difference */
#define MODX (16384) // 1<<(2*7)
#define MASK (0x3fff) // MODX - 1
const int64_t tc = (_monotonic_cnt + timestamp) & MASK;
const int64_t ti = ((buf[2] & 0x7f) << 7) | (buf[1] & 0x7f);
const int64_t tdiff = (MODX + tc - ti) % MODX;
#if 0 //DEBUG
printf("MIDI DELAY: # %5"PRId64" %5"PRId64" [samples] (%5"PRId64" - %8"PRId64") @(%5"PRId64" + %d)\n",
_cnt_total, tdiff, tc, ti, _monotonic_cnt, timestamp);
#endif
/* running variance */
if (_cnt_total == 0) {
_var_m = tdiff;