/*
- Copyright (C) 2008 Hans Baier
+ Copyright (C) 2008 Hans Baier
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
$Id$
*/
+
#include "ardour/ticker.h"
#include "ardour/session.h"
+#include "ardour/tempo.h"
+
+#ifdef DEBUG_MIDI_CLOCK
+#include <iostream>
+using namespace std;
+#endif
namespace ARDOUR
{
-void Ticker::set_session(Session& s)
+void Ticker::set_session(Session& s)
{
_session = &s;
-
- if(_session) {
+
+ if (_session) {
_session->tick.connect(mem_fun (*this, &Ticker::tick));
_session->GoingAway.connect(mem_fun (*this, &Ticker::going_away));
}
}
+void MidiClockTicker::set_session(Session& s)
+{
+ Ticker::set_session(s);
+
+ if (_session) {
+ _session->MIDIClock_PortChanged.connect(
+ mem_fun (*this, &MidiClockTicker::update_midi_clock_port));
+ _session->TransportStateChange.connect(
+ mem_fun (*this, &MidiClockTicker::transport_state_changed));
+ _session->PositionChanged.connect(
+ mem_fun (*this, &MidiClockTicker::position_changed));
+ _session->TransportLooped.connect(
+ mem_fun (*this, &MidiClockTicker::transport_looped));
+ update_midi_clock_port();
+ }
+}
+
+void MidiClockTicker::update_midi_clock_port()
+{
+ _midi_port = _session->midi_clock_port();
+}
+
+void MidiClockTicker::transport_state_changed()
+{
+ if (_session->exporting()) {
+ /* no midi clock during export, for now */
+ return;
+ }
+
+ float speed = _session->transport_speed();
+ nframes_t position = _session->transport_frame();
+#ifdef DEBUG_MIDI_CLOCK
+ cerr << "Transport state change, speed:" << speed << "position:" << position<< " play loop " << _session->get_play_loop() << endl;
+#endif
+ if (speed == 1.0f) {
+ _last_tick = position;
+
+ if (!Config->get_send_midi_clock())
+ return;
+
+ if (_session->get_play_loop()) {
+ assert(_session->locations()->auto_loop_location());
+ if (position == _session->locations()->auto_loop_location()->start()) {
+ send_start_event(0);
+ } else {
+ send_continue_event(0);
+ }
+ } else if (position == 0) {
+ send_start_event(0);
+ } else {
+ send_continue_event(0);
+ }
+
+ send_midi_clock_event(0);
+
+ } else if (speed == 0.0f) {
+ if (!Config->get_send_midi_clock())
+ return;
+
+ send_stop_event(0);
+ }
+
+ tick(position, *((ARDOUR::BBT_Time *) 0), *((SMPTE::Time *)0));
+}
+
+void MidiClockTicker::position_changed(nframes_t position)
+{
+#ifdef DEBUG_MIDI_CLOCK
+ cerr << "Position changed:" << position << endl;
+#endif
+ _last_tick = position;
+}
+
+void MidiClockTicker::transport_looped()
+{
+ Location* loop_location = _session->locations()->auto_loop_location();
+ assert(loop_location);
+
+#ifdef DEBUG_MIDI_CLOCK
+ cerr << "Transport looped, position:" << _session->transport_frame()
+ << " loop start " << loop_location->start( )
+ << " loop end " << loop_location->end( )
+ << " play loop " << _session->get_play_loop()
+ << endl;
+#endif
+
+ // adjust _last_tick, so that the next MIDI clock message is sent
+ // in due time (and the tick interval is still constant)
+ nframes_t elapsed_since_last_tick = loop_location->end() - _last_tick;
+ _last_tick = loop_location->start() - elapsed_since_last_tick;
+}
+
+void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& /*transport_bbt*/, const SMPTE::Time& /*transport_smpt*/)
+{
+#ifdef WITH_JACK_MIDI
+ if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f)
+ return;
+
+ MIDI::JACK_MidiPort* jack_port = dynamic_cast<MIDI::JACK_MidiPort*>(_midi_port);
+ assert(jack_port);
+
+ while (true) {
+ double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
+ nframes_t next_tick_offset = nframes_t(next_tick) - transport_frames;
+
+#ifdef DEBUG_MIDI_CLOCK
+ cerr << "Transport:" << transport_frames
+ << ":Last tick time:" << _last_tick << ":"
+ << ":Next tick time:" << next_tick << ":"
+ << "Offset:" << next_tick_offset << ":"
+ << "cycle length:" << jack_port->nframes_this_cycle()
+ << endl;
+#endif
+
+ if (next_tick_offset >= jack_port->nframes_this_cycle())
+ return;
+
+ send_midi_clock_event(next_tick_offset);
+
+ _last_tick = next_tick;
+ }
+#endif // WITH_JACK_MIDI
+}
+
+double MidiClockTicker::one_ppqn_in_frames(nframes_t transport_position)
+{
+ const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
+ const Meter& current_meter = _session->tempo_map().meter_at(transport_position);
+ double frames_per_beat =
+ current_tempo.frames_per_beat(_session->nominal_frame_rate(),
+ current_meter);
+
+ double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
+ double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
+
+ return frames_per_quarter_note / double (_ppqn);
+}
+
+void MidiClockTicker::send_midi_clock_event(nframes_t offset)
+{
+#ifdef WITH_JACK_MIDI
+ assert (MIDI::JACK_MidiPort::is_process_thread());
+#endif // WITH_JACK_MIDI
+#ifdef DEBUG_MIDI_CLOCK
+ cerr << "Tick with offset " << offset << endl;
+#endif // DEBUG_MIDI_CLOCK
+ static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
+ _midi_port->write(_midi_clock_tick, 1, offset);
+}
+
+void MidiClockTicker::send_start_event(nframes_t offset)
+{
+ static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
+ _midi_port->write(_midi_clock_tick, 1, offset);
+}
+
+void MidiClockTicker::send_continue_event(nframes_t offset)
+{
+ static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
+ _midi_port->write(_midi_clock_tick, 1, offset);
+}
-void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& transport_bbt, const SMPTE::Time& transport_smpt)
+void MidiClockTicker::send_stop_event(nframes_t offset)
{
-
+ static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
+ _midi_port->write(_midi_clock_tick, 1, offset);
}
}
projects / ardour.git / blobdiff