/*
- 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
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 "pbd/compose.h"
+#include "pbd/stacktrace.h"
+
+#include "evoral/midi_events.h"
+
+#include "ardour/async_midi_port.h"
+#include "ardour/audioengine.h"
+#include "ardour/midi_buffer.h"
+#include "ardour/midi_port.h"
+#include "ardour/lmath.h"
#include "ardour/ticker.h"
#include "ardour/session.h"
#include "ardour/tempo.h"
+#include "ardour/debug.h"
+
+using namespace ARDOUR;
+using namespace PBD;
-namespace ARDOUR
+/** MIDI Clock Position tracking */
+class MidiClockTicker::Position : public Timecode::BBT_Time
{
+public:
+
+ Position() : speed(0.0f), frame(0), midi_beats(0) { }
+ ~Position() { }
+
+ /** Sync timing information taken from the given Session
+ * @return True if timings differed
+ */
+
+ bool sync (Session* s) {
+
+ bool changed = false;
+
+ double sp = s->transport_speed();
+ framecnt_t fr = s->transport_frame();
+
+ if (speed != sp) {
+ speed = sp;
+ changed = true;
+ }
+
+ if (frame != fr) {
+ frame = fr;
+ changed = true;
+ }
+
+ /* Midi beats and clocks always gets updated for now */
+
+ s->bbt_time (this->frame, *this);
+
+ const TempoMap& tempo = s->tempo_map();
+
+ const double divisions = tempo.meter_at(frame).divisions_per_bar();
+ const double divisor = tempo.meter_at(frame).note_divisor();
+ const double qnote_scale = divisor * 0.25f;
+ double mb;
+ /** Midi Beats in terms of Song Position Pointer is equivalent to total
+ * sixteenth notes at 'time'
+ */
-void Ticker::set_session(Session& s)
+ mb = (((bars - 1) * divisions) + beats - 1);
+ mb += (double)ticks / (double)Position::ticks_per_beat * qnote_scale;
+ mb *= 16.0f / divisor;
+
+ if (mb != midi_beats) {
+ midi_beats = mb;
+ midi_clocks = midi_beats * 6.0f;
+ changed = true;
+ }
+
+ return changed;
+ }
+
+ double speed;
+ framecnt_t frame;
+ double midi_beats;
+ double midi_clocks;
+
+ void print (std::ostream& s) {
+ s << "frames: " << frame << " midi beats: " << midi_beats << " speed: " << speed;
+ }
+};
+
+
+MidiClockTicker::MidiClockTicker ()
+ : _ppqn (24)
+ , _last_tick (0.0)
+ , _send_pos (false)
+ , _send_state (false)
{
- _session = &s;
-
- if(_session) {
- _session->tick.connect(mem_fun (*this, &Ticker::tick));
- _session->GoingAway.connect(mem_fun (*this, &Ticker::going_away));
- }
+ _pos.reset (new Position());
}
-void MidiClockTicker::set_session(Session& s)
+MidiClockTicker::~MidiClockTicker()
{
- Ticker::set_session(s);
-
- if(_session) {
- _session->MIDIClock_PortChanged.connect(mem_fun (*this, &MidiClockTicker::update_midi_clock_port));
+ _pos.reset (0);
+}
+
+void
+MidiClockTicker::set_session (Session* s)
+{
+ SessionHandlePtr::set_session (s);
+
+ if (_session) {
+ _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
+ _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
+ _session->Located.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::session_located, this));
+
update_midi_clock_port();
+ _pos->sync (_session);
}
}
-void MidiClockTicker::update_midi_clock_port()
+void
+MidiClockTicker::session_located()
{
- _jack_port = (MIDI::JACK_MidiPort*) _session->midi_clock_port();
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Session Located: %1, speed: %2\n", _session->transport_frame(), _session->transport_speed()));
+
+ if (!_session || !_pos->sync (_session)) {
+ return;
+ }
+
+ _last_tick = _pos->frame;
+
+ if (!Config->get_send_midi_clock()) {
+ return;
+ }
+
+ _send_pos = true;
+}
+
+void
+MidiClockTicker::session_going_away ()
+{
+ SessionHandlePtr::session_going_away();
+ _midi_port.reset ();
}
-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)
+void
+MidiClockTicker::update_midi_clock_port()
+{
+ _midi_port = _session->midi_clock_output_port();
+}
+
+void
+MidiClockTicker::transport_state_changed()
+{
+ if (_session->exporting()) {
+ /* no midi clock during export, for now */
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);
+ }
+
+ if (!_session->engine().running()) {
+ /* Engine stopped, we can't do anything */
+ return;
+ }
+
+ if (! _pos->sync (_session)) {
+ return;
+ }
+
+ DEBUG_TRACE (DEBUG::MidiClock,
+ string_compose ("Transport state change @ %4, speed: %1 position: %2 play loop: %3\n",
+ _pos->speed, _pos->frame, _session->get_play_loop(), _pos->frame)
+ );
+
+ _last_tick = _pos->frame;
+
+ if (! Config->get_send_midi_clock()) {
+ return;
+ }
+
+ _send_state = true;
+
+ // tick (_pos->frame);
+}
+
+void
+MidiClockTicker::transport_looped()
+{
+ Location* loop_location = _session->locations()->auto_loop_location();
+ assert(loop_location);
+
+ DEBUG_TRACE (DEBUG::MidiClock,
+ string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
+ _session->transport_frame(), loop_location->start(), loop_location->end(), _session->get_play_loop())
+ );
+
+ // adjust _last_tick, so that the next MIDI clock message is sent
+ // in due time (and the tick interval is still constant)
+
+ framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
+
+ if (loop_location->start() > elapsed_since_last_tick) {
+ _last_tick = loop_location->start() - elapsed_since_last_tick;
+ } else {
+ _last_tick = 0;
+ }
+}
+
+void
+MidiClockTicker::tick (const framepos_t& /* transport_frame */, pframes_t nframes)
+{
+ if (!Config->get_send_midi_clock() || _session == 0 || _midi_port == 0) {
+ return;
+ }
+
+ if (_send_pos) {
+ if (_pos->speed == 0.0f) {
+ send_position_event (llrint (_pos->midi_beats), 0, nframes);
+ } else if (_pos->speed == 1.0f) {
+ send_stop_event (0, nframes);
+
+ if (_pos->frame == 0) {
+ send_start_event (0, nframes);
+ } else {
+ send_position_event (llrint (_pos->midi_beats), 0, nframes);
+ send_continue_event (0, nframes);
+ }
+ } else {
+ /* Varispeed not supported */
+ }
+
+ _send_pos = false;
+ }
+
+
+ if (_send_state) {
+ if (_pos->speed == 1.0f) {
+ if (_session->get_play_loop()) {
+ assert(_session->locations()->auto_loop_location());
+
+ if (_pos->frame == _session->locations()->auto_loop_location()->start()) {
+ send_start_event (0, nframes);
+ } else {
+ send_continue_event (0, nframes);
+ }
+
+ } else if (_pos->frame == 0) {
+ send_start_event (0, nframes);
+ } else {
+ send_continue_event (0, nframes);
+ }
+
+ // send_midi_clock_event (0);
+
+ } else if (_pos->speed == 0.0f) {
+ send_stop_event (0, nframes);
+ send_position_event (llrint (_pos->midi_beats), 0, nframes);
+ }
+
+ _send_state = false;
+ }
+
+ if (_session->transport_speed() != 1.0f) {
+ /* no varispeed support and nothing to do after this if stopped */
+ return;
+ }
+
+ const framepos_t end = _pos->frame + nframes;
+ double iter = _last_tick;
+
+ while (true) {
+ double clock_delta = one_ppqn_in_frames (llrint (iter));
+ double next_tick = iter + clock_delta;
+ frameoffset_t next_tick_offset = llrint (next_tick) - end;
+
+ DEBUG_TRACE (DEBUG::MidiClock,
+ string_compose ("Tick: iter: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
+ iter, _last_tick, next_tick, next_tick_offset, nframes));
+
+ if (next_tick_offset >= nframes) {
+ break;
+ }
+
+ if (next_tick_offset >= 0) {
+ send_midi_clock_event (next_tick_offset, nframes);
+ }
+
+ iter = next_tick;
+ }
+
+ _last_tick = iter;
+ _pos->frame = end;
+}
+
+double
+MidiClockTicker::one_ppqn_in_frames (framepos_t transport_position)
+{
+ const Tempo& current_tempo = _session->tempo_map().tempo_at (transport_position);
+ double frames_per_beat = current_tempo.frames_per_beat (_session->nominal_frame_rate());
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;
+ return frames_per_quarter_note / double (_ppqn);
}
+void
+MidiClockTicker::send_midi_clock_event (pframes_t offset, pframes_t nframes)
+{
+ if (!_midi_port) {
+ return;
+ }
+
+ static uint8_t msg = MIDI_CMD_COMMON_CLOCK;
+
+ MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
+ mb.push_back (offset, 1, &msg);
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));
+}
+
+void
+MidiClockTicker::send_start_event (pframes_t offset, pframes_t nframes)
+{
+ if (!_midi_port) {
+ return;
+ }
+
+ static uint8_t msg = { MIDI_CMD_COMMON_START };
+ MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
+ mb.push_back (offset, 1, &msg);
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Start %1\n", _last_tick));
+}
+
+void
+MidiClockTicker::send_continue_event (pframes_t offset, pframes_t nframes)
+{
+ if (!_midi_port) {
+ return;
+ }
+
+ static uint8_t msg = { MIDI_CMD_COMMON_CONTINUE };
+ MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
+ mb.push_back (offset, 1, &msg);
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Continue %1\n", _last_tick));
+}
+
+void
+MidiClockTicker::send_stop_event (pframes_t offset, pframes_t nframes)
+{
+ if (!_midi_port) {
+ return;
+ }
+
+ static uint8_t msg = MIDI_CMD_COMMON_STOP;
+ MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
+ mb.push_back (offset, 1, &msg);
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Stop %1\n", _last_tick));
}
+void
+MidiClockTicker::send_position_event (uint32_t midi_beats, pframes_t offset, pframes_t nframes)
+{
+ if (!_midi_port) {
+ return;
+ }
+
+ /* can only use 14bits worth */
+ if (midi_beats > 0x3fff) {
+ return;
+ }
+
+ /* split midi beats into a 14bit value */
+ MIDI::byte msg[3];
+ msg[0] = MIDI_CMD_COMMON_SONG_POS;
+ msg[1] = midi_beats & 0x007f;
+ msg[2] = midi_beats >> 7;
+
+ MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
+ mb.push_back (offset, 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));
+
+}
projects / ardour.git / blobdiff