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/*
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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#include "ardour/ticker.h"
#include "ardour/session.h"
#include "ardour/tempo.h"
#ifdef DEBUG_MIDI_CLOCK
#include <iostream>
using namespace std;
#endif
using namespace ARDOUR;
void Ticker::set_session (Session* s)
{
SessionHandlePtr::set_session (s);
if (_session) {
_session->tick.connect_same_thread (_session_connections, boost::bind (&Ticker::tick, this, _1, _2, _3));
}
}
void MidiClockTicker::set_session (Session* s)
{
Ticker::set_session (s);
if (_session) {
_session->MIDIClock_PortChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::update_midi_clock_port, this));
_session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
_session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
_session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
update_midi_clock_port();
}
}
void
MidiClockTicker::session_going_away ()
{
SessionHandlePtr::session_going_away();
_midi_port = 0;
}
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), *((Timecode::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 Timecode::Time& /*transport_smpt*/)
{
if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0)
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;
}
}
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)
{
if (!_midi_port) {
return;
}
#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)
{
if (!_midi_port) {
return;
}
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)
{
if (!_midi_port) {
return;
}
static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
_midi_port->write(_midi_clock_tick, 1, offset);
}
void MidiClockTicker::send_stop_event(nframes_t offset)
{
if (!_midi_port) {
return;
}
static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
_midi_port->write(_midi_clock_tick, 1, offset);
}
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