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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"
namespace ARDOUR
{
void Ticker::set_session(Session& s)
{
_session = &s;
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));
update_midi_clock_port();
}
}
void MidiClockTicker::update_midi_clock_port()
{
_jack_port = (MIDI::JACK_MidiPort*) _session->midi_clock_port();
}
void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& transport_bbt, const SMPTE::Time& transport_smpt)
{
if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f)
return;
const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_frames);
const Meter& current_meter = _session->tempo_map().meter_at(transport_frames);
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;
nframes_t one_ppqn_in_frames = frames_per_quarter_note / double (_ppqn);
nframes_t next_tick = _last_tick + one_ppqn_in_frames;
nframes_t next_tick_offset = next_tick - transport_frames;
assert(_jack_port->is_process_thread());
static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_TICK };
_jack_port->write(_midi_clock_tick, 1, next_tick_offset);
_last_tick = next_tick;
}
}
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