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mclk gen: bits and pieces but nothing finished

This commit is contained in:
Paul Davis 2023-04-07 14:30:46 -06:00
parent e9f71824a1
commit 77dd56e346
2 changed files with 55 additions and 32 deletions
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1
libs/ardour/ardour/ticker.h
View File

@ -44,6 +44,7 @@ public:
virtual ~MidiClockTicker ();
void tick (ProcessedRanges const &, pframes_t, samplecnt_t);
void locate (samplepos_t position, pframes_t);
private:
ARDOUR::Session& _session;

86
libs/ardour/ticker.cc
View File

@ -124,43 +124,51 @@ MidiClockTicker::tick (ProcessedRanges const & pr, pframes_t n_samples, samplecn
* "start at zero"
*/
if (pre_roll > 0 && pre_roll >= _mclk_out_latency.max && pre_roll < _mclk_out_latency.max + n_samples) {
assert (!_rolling);
if (pre_roll) {
pframes_t pos = pre_roll - _mclk_out_latency.max;
_next_tick = one_ppqn_in_samples (0) - _mclk_out_latency.max;
if (pre_roll >= _mclk_out_latency.max && pre_roll < _mclk_out_latency.max + n_samples) {
DEBUG_TRACE (DEBUG::MidiClock, string_compose (
"Preroll Start offset: %1 (port latency: %2, remaining preroll: %3) next %4\n",
pos, _mclk_out_latency.max, pre_roll, _next_tick));
/* preroll ends somewhere in this cycle */
_rolling = true;
_beat_pos = 0;
_clock_cnt = 1;
_transport_pos = 0;
assert (!_rolling);
send_start_event (pos, n_samples);
send_midi_clock_event (pos, n_samples);
}
/* Handle case _mclk_out_latency.max > one_ppqn_in_samples (0)
* may need to send more than one clock */
if (pre_roll > 0 && _next_tick < 0) {
assert (_rolling);
while (_next_tick < 0 && pre_roll >= -_next_tick && pre_roll < n_samples - _next_tick) {
pframes_t pos = pre_roll + _next_tick;
_next_tick += one_ppqn_in_samples (llrint (0));
pframes_t pos = pre_roll - _mclk_out_latency.max;
_next_tick = one_ppqn_in_samples (0) - _mclk_out_latency.max;
DEBUG_TRACE (DEBUG::MidiClock, string_compose (
"Preroll Tick offset: %1 (port latency: %2, remaining preroll: %3) next %4\n",
pos, _mclk_out_latency.max, pre_roll, _next_tick));
"Preroll Start offset: %1 (port latency: %2, remaining preroll: %3) next %4\n",
pos, _mclk_out_latency.max, pre_roll, _next_tick));
_rolling = true;
_beat_pos = 0;
_clock_cnt = 1;
_transport_pos = 0;
send_start_event (pos, n_samples);
send_midi_clock_event (pos, n_samples);
if (++_clock_cnt == 6) {
_clock_cnt = 0;
++_beat_pos;
} else {
/* Handle case _mclk_out_latency.max > one_ppqn_in_samples (0)
* may need to send more than one clock */
if (_next_tick < 0) {
assert (_rolling);
while (_next_tick < 0 && pre_roll >= -_next_tick && pre_roll < n_samples - _next_tick) {
pframes_t pos = pre_roll + _next_tick;
_next_tick += one_ppqn_in_samples (llrint (0));
DEBUG_TRACE (DEBUG::MidiClock, string_compose (
"Preroll Tick offset: %1 (port latency: %2, remaining preroll: %3) next %4\n",
pos, _mclk_out_latency.max, pre_roll, _next_tick));
send_midi_clock_event (pos, n_samples);
if (++_clock_cnt == 6) {
_clock_cnt = 0;
++_beat_pos;
}
}
}
}
}
@ -184,6 +192,8 @@ MidiClockTicker::tick (ProcessedRanges const & pr, pframes_t n_samples, samplecn
* special case.
*/
assert (_rolling);
if (pr.start[1] == 0) {
send_start_event (0, n_samples);
} else {
@ -196,6 +206,7 @@ MidiClockTicker::tick (ProcessedRanges const & pr, pframes_t n_samples, samplecn
_beat_pos = beat_pos;
_next_tick = clk_pos - _mclk_out_latency.max;
send_stop_event (offset, n_samples);
send_position_event (_beat_pos, offset, n_samples); // consider sending this early
send_continue_event (offset + (_next_tick - pr.start[1]), n_samples);
}
@ -243,6 +254,7 @@ MidiClockTicker::sub_tick (samplepos_t start_sample, samplepos_t end_sample, pfr
_clock_cnt = 0;
if (_beat_pos == 0 && _next_tick == 0 && start_sample == 0) {
DEBUG_TRACE (DEBUG::MidiClock, "starting up with all zeroes\n");
send_start_event (offset, n_samples);
} else {
send_position_event (_beat_pos, offset, n_samples); // consider sending this early
@ -304,7 +316,7 @@ MidiClockTicker::send_start_event (pframes_t offset, pframes_t nframes)
MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
mb.push_back (offset, Evoral::MIDI_EVENT, 1, &msg);
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Start %1\n", _next_tick));
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Start %1 @ %2\n", _next_tick, offset));
}
void
@ -316,7 +328,7 @@ MidiClockTicker::send_continue_event (pframes_t offset, pframes_t nframes)
MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
mb.push_back (offset, Evoral::MIDI_EVENT, 1, &msg);
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Continue %1\n", _next_tick));
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Continue %1 @ %2\n", _next_tick, offset));
}
void
@ -328,7 +340,7 @@ MidiClockTicker::send_stop_event (pframes_t offset, pframes_t nframes)
MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
mb.push_back (offset, Evoral::MIDI_EVENT, 1, &msg);
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Stop %1\n", _next_tick));
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Stop %1 @ %2\n", _next_tick, offset));
}
void
@ -350,5 +362,15 @@ MidiClockTicker::send_position_event (uint32_t midi_beats, pframes_t offset, pfr
MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
mb.push_back (offset, Evoral::MIDI_EVENT, 3, &msg[0]);
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Song Position Sent: %1 to %2 (events now %3, buf = %4)\n", midi_beats, _midi_port->name (), mb.size (), &mb));
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Song Position Sent: %1 to %2 (events now %3, buf = %4) @ %5\n", midi_beats, _midi_port->name (), mb.size (), &mb, offset));
}
void
MidiClockTicker::locate (samplepos_t samplepos, pframes_t nsamples)
{
uint32_t beat_pos;
samplepos_t clk_pos;
Temporal::TempoMap::use()->midi_clock_beat_at_or_after (samplepos + _mclk_out_latency.max, clk_pos, beat_pos);
send_position_event (beat_pos, 0, nsamples);
}