#include <pbd/pthread_utils.h>
#include <midi++/port.h>
+#include <midi++/jack.h>
#include <ardour/slave.h>
#include <ardour/session.h>
#include <ardour/audioengine.h>
#include <ardour/cycles.h>
#include <ardour/tempo.h>
+
#include "i18n.h"
using namespace ARDOUR;
MIDIClock_Slave::MIDIClock_Slave (Session& s, MIDI::Port& p, int ppqn)
: session (s)
, ppqn (ppqn)
+ , accumulator_index (0)
+ , average_midi_clock_frame_duration (0.0)
{
rebind (p);
reset ();
+
+ for(int i = 0; i < accumulator_size; i++)
+ accumulator[i]=0.0;
}
MIDIClock_Slave::~MIDIClock_Slave()
port = &p;
+#ifdef DEBUG_MIDI_CLOCK
std::cerr << "MIDIClock_Slave: connecting to port " << port->name() << std::endl;
+#endif
- connections.push_back (port->input()->timing.connect (mem_fun (*this, &MIDIClock_Slave::update_midi_clock)));
- connections.push_back (port->input()->start.connect (mem_fun (*this, &MIDIClock_Slave::start)));
- connections.push_back (port->input()->stop.connect (mem_fun (*this, &MIDIClock_Slave::stop)));
+ connections.push_back (port->input()->timing.connect (mem_fun (*this, &MIDIClock_Slave::update_midi_clock)));
+ connections.push_back (port->input()->start.connect (mem_fun (*this, &MIDIClock_Slave::start)));
+ connections.push_back (port->input()->contineu.connect (mem_fun (*this, &MIDIClock_Slave::contineu)));
+ connections.push_back (port->input()->stop.connect (mem_fun (*this, &MIDIClock_Slave::stop)));
}
-void
-MIDIClock_Slave::update_midi_clock (Parser& parser)
+void
+MIDIClock_Slave::calculate_one_ppqn_in_frames_at(nframes_t time)
{
- // ignore clock events if no start event received
- if(!_started)
- return;
-
- nframes_t now = session.engine().frame_time();
-
- SafeTime last;
- read_current (&last);
-
- const Tempo& current_tempo = session.tempo_map().tempo_at(now);
- const Meter& current_meter = session.tempo_map().meter_at(now);
+ const Tempo& current_tempo = session.tempo_map().tempo_at(time);
+ const Meter& current_meter = session.tempo_map().meter_at(time);
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;
- one_ppqn_in_frames = frames_per_quarter_note / ppqn;
-
- /*
- Also compensate for audio latency.
- */
+ one_ppqn_in_frames = frames_per_quarter_note / double (ppqn);
+}
- midi_clock_frame += (long) (one_ppqn_in_frames)
- + session.worst_output_latency();
+void
+MIDIClock_Slave::update_midi_clock (Parser& parser, nframes_t timestamp)
+{
+ nframes_t now = timestamp;
- /*
- std::cerr << "got MIDI Clock message at time " << now
- << " midi_clock_frame: " << midi_clock_frame
- << " one_ppqn_in_frames: " << one_ppqn_in_frames << std::endl;
- */
- if (first_midi_clock_frame == 0) {
- first_midi_clock_frame = midi_clock_frame;
- first_midi_clock_time = now;
+ SafeTime last;
+ read_current (&last);
+
+ if (_starting) {
+ assert(last.timestamp == 0);
+ // let ardour go after first MIDI Clock Event
+ _starting = false;
}
-
+
+ calculate_one_ppqn_in_frames_at(now);
+
+ // for the first MIDI clock event we don't have any past
+ // data, so we assume a sane tempo
+ if(last.timestamp == 0) {
+ current_midi_clock_frame_duration = one_ppqn_in_frames;
+ } else {
+ current_midi_clock_frame_duration = now - last.timestamp;
+ }
+
+ // moving average over incoming intervals
+ accumulator[accumulator_index++] = current_midi_clock_frame_duration;
+ if(accumulator_index == accumulator_size)
+ accumulator_index = 0;
+
+ average_midi_clock_frame_duration = 0.0;
+ for(int i = 0; i < accumulator_size; i++)
+ average_midi_clock_frame_duration += accumulator[i];
+ average_midi_clock_frame_duration /= double(accumulator_size);
+
+#ifdef DEBUG_MIDI_CLOCK
+#ifdef WITH_JACK_MIDI
+ JACK_MidiPort* jack_port = dynamic_cast<JACK_MidiPort*>(port);
+ pthread_t process_thread_id = 0;
+ if(jack_port) {
+ process_thread_id = jack_port->get_process_thread();
+ }
+
+ std::cerr
+ << " got MIDI Clock message at time " << now
+ << " session time: " << session.engine().frame_time()
+ << " transport position: " << session.transport_frame()
+ << " real delta: " << current_midi_clock_frame_duration
+ << " reference: " << one_ppqn_in_frames
+ << " average: " << average_midi_clock_frame_duration
+ << std::endl;
+#endif // DEBUG_MIDI_CLOCK
+#endif // WITH_JACK_MIDI
+
current.guard1++;
- current.position = midi_clock_frame;
+ current.position += one_ppqn_in_frames;
+ current_position += one_ppqn_in_frames;
current.timestamp = now;
current.guard2++;
}
void
-MIDIClock_Slave::start (Parser& parser)
+MIDIClock_Slave::start (Parser& parser, nframes_t timestamp)
{
- std::cerr << "MIDIClock_Slave got start message" << endl;
-
- session.request_transport_speed (1.0);
- midi_clock_speed = 1.0;
+
+ nframes_t now = timestamp;
+
+#ifdef DEBUG_MIDI_CLOCK
+ cerr << "MIDIClock_Slave got start message at time " << now << " session time: " << session.engine().frame_time() << endl;
+#endif
+
+ if(!locked()) {
+ cerr << "Did not start because not locked!" << endl;
+ return;
+ }
+
+ current_midi_clock_frame_duration = 0;
+
+ current.guard1++;
+ current.position = 0;
+ current_position = 0;
+ current.timestamp = 0;
+ current.guard2++;
+
+ _started = true;
_starting = true;
- _started = true;
}
void
-MIDIClock_Slave::stop (Parser& parser)
+MIDIClock_Slave::contineu (Parser& parser, nframes_t timestamp)
{
+#ifdef DEBUG_MIDI_CLOCK
+ std::cerr << "MIDIClock_Slave got continue message" << endl;
+#endif
+ start(parser, timestamp);
+}
+
+
+void
+MIDIClock_Slave::stop (Parser& parser, nframes_t timestamp)
+{
+#ifdef DEBUG_MIDI_CLOCK
std::cerr << "MIDIClock_Slave got stop message" << endl;
+#endif
+
+ current_midi_clock_frame_duration = 0;
- session.request_transport_speed (0);
- midi_clock_speed = 0.0f;
- midi_clock_frame = 0;
- _starting = false;
+ current.guard1++;
+ current.position = 0;
+ current_position = 0;
+ current.timestamp = 0;
+ current.guard2++;
+
_started = false;
reset();
}
}
bool
-MIDIClock_Slave::speed_and_position (float& speed, nframes_t& pos)
+MIDIClock_Slave::starting() const
{
- //std::cerr << "MIDIClock_Slave speed and position() called" << endl;
- nframes_t now = session.engine().frame_time();
- nframes_t frame_rate = session.frame_rate();
- nframes_t elapsed;
- float speed_now;
-
- SafeTime last;
- read_current (&last);
-
- if (first_midi_clock_time == 0) {
- speed = 0;
- pos = last.position;
- return true;
- }
+ return _starting;
+}
+bool
+MIDIClock_Slave::stop_if_no_more_clock_events(nframes_t& pos, nframes_t now, SafeTime& last)
+{
/* no timecode for 1/4 second ? conclude that its stopped */
-
- if (last_inbound_frame && now > last_inbound_frame && now - last_inbound_frame > frame_rate / 4) {
- midi_clock_speed = 0;
+ if (last_inbound_frame &&
+ now > last_inbound_frame &&
+ now - last_inbound_frame > session.frame_rate() / 4) {
+#ifdef DEBUG_MIDI_CLOCK
+ cerr << "No MIDI Clock frames received for some time, stopping!" << endl;
+#endif
pos = last.position;
session.request_locate (pos, false);
session.request_transport_speed (0);
- this->stop(*port->input());
+ this->stop(*port->input(), now);
reset();
- return false;
- }
-
- if(_starting) {
- speed_now = 1.0;
- _starting = false;
+ return true;
} else {
- speed_now = (float) ((last.position - first_midi_clock_frame) / (double) (now - first_midi_clock_time));
+ return false;
}
+}
- //cerr << "speed_and_position: speed_now: " << speed_now ;
-
- accumulator[accumulator_index++] = speed_now;
-
- if (accumulator_index >= accumulator_size) {
- have_first_accumulated_speed = true;
- accumulator_index = 0;
+bool
+MIDIClock_Slave::speed_and_position (float& speed, nframes_t& pos)
+{
+ if (!_started) {
+ speed = 0.0;
+ pos = 0;
+ return true;
}
+
+ nframes_t now = session.engine().frame_time();
+ SafeTime last;
+ read_current (&last);
- if (have_first_accumulated_speed) {
- float total = 0;
-
- for (int32_t i = 0; i < accumulator_size; ++i) {
- total += accumulator[i];
- }
-
- midi_clock_speed = total / accumulator_size;
-
- } else {
-
- midi_clock_speed = speed_now;
-
+ if (stop_if_no_more_clock_events(pos, now, last)) {
+ return false;
}
+ //cerr << " now: " << now << " last: " << last.timestamp;
- if (midi_clock_speed == 0.0f) {
-
- elapsed = 0;
-
+ // calculate speed
+ double speed_double = one_ppqn_in_frames / average_midi_clock_frame_duration;
+ speed = float(speed_double);
+ //cerr << " final speed: " << speed;
+
+ // calculate position
+ if (now > last.timestamp) {
+ // we are in between MIDI clock messages
+ // so we interpolate position according to speed
+ nframes_t elapsed = now - last.timestamp;
+ pos = nframes_t (current_position + double(elapsed) * speed_double);
} else {
-
- /* scale elapsed time by the current MIDI Clock speed */
-
- if (last.timestamp && (now > last.timestamp)) {
- elapsed = (nframes_t) floor (midi_clock_speed * (now - last.timestamp));
- } else {
- elapsed = 0; /* XXX is this right? */
- }
+ // A new MIDI clock message has arrived this cycle
+ pos = current_position;
}
-
- /* now add the most recent timecode value plus the estimated elapsed interval */
-
- pos = elapsed + last.position;
-
- speed = midi_clock_speed;
- //cerr << " final speed: " << speed << " position: " << pos << endl;
+ /*
+ cerr << " transport position now: " << session.transport_frame();
+ cerr << " calculated position: " << pos;
+ cerr << endl;
+ */
+
return true;
}
ARDOUR::nframes_t
MIDIClock_Slave::resolution() const
{
- return (nframes_t) one_ppqn_in_frames;
+ // one beat
+ return (nframes_t) one_ppqn_in_frames * ppqn;
}
void
MIDIClock_Slave::reset ()
{
- /* XXX massive thread safety issue here. MTC could
- be being updated as we call this. but this
- supposed to be a realtime-safe call.
- */
last_inbound_frame = 0;
current.guard1++;
current.position = 0;
+ current_position = 0;
current.timestamp = 0;
current.guard2++;
- first_midi_clock_frame = 0;
- first_midi_clock_time = 0;
-
- midi_clock_speed = 0;
+
+ session.request_locate(0, false);
}
projects / ardour.git / blobdiff