/*
- Copyright (C) 2002-4 Paul Davis
+ Copyright (C) 2008 Paul Davis
+ Author: 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
*/
+#include <cmath>
#include <errno.h>
#include <poll.h>
#include <sys/types.h>
#include <unistd.h>
-#include <pbd/error.h>
-#include <pbd/failed_constructor.h>
-#include <pbd/pthread_utils.h>
+#include "pbd/error.h"
+#include "pbd/failed_constructor.h"
+#include "pbd/pthread_utils.h"
+#include "pbd/convert.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 "midi++/port.h"
+#include "ardour/debug.h"
+#include "ardour/slave.h"
+#include "ardour/tempo.h"
#include "i18n.h"
+using namespace std;
using namespace ARDOUR;
-using namespace sigc;
using namespace MIDI;
using namespace PBD;
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)
+ : ppqn (ppqn)
+ , bandwidth (1.0 / 60.0) // 1 BpM = 1 / 60 Hz
{
+ session = (ISlaveSessionProxy *) new SlaveSessionProxy(s);
rebind (p);
reset ();
+}
- for(int i = 0; i < accumulator_size; i++)
- accumulator[i]=0.0;
+MIDIClock_Slave::MIDIClock_Slave (ISlaveSessionProxy* session_proxy, int ppqn)
+ : session(session_proxy)
+ , ppqn (ppqn)
+ , bandwidth (1.0 / 60.0) // 1 BpM = 1 / 60 Hz
+{
+ reset ();
}
MIDIClock_Slave::~MIDIClock_Slave()
{
+ delete session;
}
void
MIDIClock_Slave::rebind (MIDI::Port& p)
{
- for (vector<sigc::connection>::iterator i = connections.begin(); i != connections.end(); ++i) {
- (*i).disconnect ();
- }
+ port_connections.drop_connections();
port = &p;
- std::cerr << "MIDIClock_Slave: connecting to port " << port->name() << std::endl;
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MIDIClock_Slave: connecting to port %1\n", port->name()));
- 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)));
+ port->parser()->timing.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::update_midi_clock, this, _1, _2));
+ port->parser()->start.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::start, this, _1, _2));
+ port->parser()->contineu.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::contineu, this, _1, _2));
+ port->parser()->stop.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::stop, this, _1, _2));
+ port->parser()->position.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::position, this, _1, _2, 3));
}
void
-MIDIClock_Slave::update_midi_clock (Parser& parser, nframes_t timestamp)
-{
- nframes_t now = timestamp;
-
- 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);
- double frames_per_beat =
- current_tempo.frames_per_beat(session.nominal_frame_rate(),
- current_meter);
+MIDIClock_Slave::calculate_one_ppqn_in_frames_at(framepos_t time)
+{
+ const Tempo& current_tempo = session->tempo_map().tempo_at(time);
+ double frames_per_beat = current_tempo.frames_per_beat(session->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;
one_ppqn_in_frames = frames_per_quarter_note / double (ppqn);
-
- // for the first MIDI clock event we dont 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);
-
-#if 1
- 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();
+ // DEBUG_TRACE (DEBUG::MidiClock, string_compose ("at %1, one ppqn = %2\n", time, one_ppqn_in_frames));
+}
+
+ARDOUR::framepos_t
+MIDIClock_Slave::calculate_song_position(uint16_t song_position_in_sixteenth_notes)
+{
+ framepos_t song_position_frames = 0;
+ for (uint16_t i = 1; i <= song_position_in_sixteenth_notes; ++i) {
+ // one quarter note contains ppqn pulses, so a sixteenth note is ppqn / 4 pulses
+ calculate_one_ppqn_in_frames_at(song_position_frames);
+ song_position_frames += one_ppqn_in_frames * (framepos_t)(ppqn / 4);
}
-
- 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
-
- current.guard1++;
- current.position += one_ppqn_in_frames;
- current_position += one_ppqn_in_frames;
- current.timestamp = now;
- current.guard2++;
-
- last_inbound_frame = now;
+
+ return song_position_frames;
}
void
-MIDIClock_Slave::start (Parser& parser, nframes_t timestamp)
+MIDIClock_Slave::calculate_filter_coefficients()
{
-
- nframes_t now = timestamp;
-
- //cerr << "MIDIClock_Slave got start message at time " << now << " session time: " << session.engine().frame_time() << endl;
+ // omega = 2 * PI * Bandwidth / MIDI clock frame frequency in Hz
+ omega = 2.0 * M_PI * bandwidth * one_ppqn_in_frames / session->frame_rate();
+ b = 1.4142135623730950488 * omega;
+ c = omega * omega;
+}
- if(!locked()) {
- cerr << "Did not start because not locked!" << endl;
+void
+MIDIClock_Slave::update_midi_clock (Parser& /*parser*/, framepos_t timestamp)
+{
+ // some pieces of hardware send MIDI Clock all the time
+ if ( (!_starting) && (!_started) ) {
return;
}
-
- current_midi_clock_frame_duration = 0;
-
- session.request_transport_speed(one_ppqn_in_frames / double(average_midi_clock_frame_duration));
- current.guard1++;
- current.position = 0;
- current_position = 0;
- current.timestamp = now;
- current.guard2++;
-
- _started = true;
+
+ calculate_one_ppqn_in_frames_at(should_be_position);
+
+ framepos_t elapsed_since_start = timestamp - first_timestamp;
+ double error = 0;
+
+ if (_starting || last_timestamp == 0) {
+ midi_clock_count = 0;
+
+ first_timestamp = timestamp;
+ elapsed_since_start = should_be_position;
+
+ // calculate filter coefficients
+ calculate_filter_coefficients();
+
+ // initialize DLL
+ e2 = double(one_ppqn_in_frames) / double(session->frame_rate());
+ t0 = double(elapsed_since_start) / double(session->frame_rate());
+ t1 = t0 + e2;
+
+ // let ardour go after first MIDI Clock Event
+ _starting = false;
+ } else {
+ midi_clock_count++;
+ should_be_position += one_ppqn_in_frames;
+ calculate_filter_coefficients();
+
+ // calculate loop error
+ // we use session->audible_frame() instead of t1 here
+ // because t1 is used to calculate the transport speed,
+ // so the loop will compensate for accumulating rounding errors
+ error = (double(should_be_position) - double(session->audible_frame()));
+ e = error / double(session->frame_rate());
+
+ // update DLL
+ t0 = t1;
+ t1 += b * e + e2;
+ e2 += c * e;
+ }
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("clock #%1 @ %2 arrived %3 (theoretical) audible %4 transport %5 error %6 "
+ "read delta %7 should-be delta %8 t1-t0 %9 t0 %10 t1 %11 framerate %12 appspeed %13\n",
+ midi_clock_count,
+ elapsed_since_start,
+ should_be_position,
+ session->audible_frame(),
+ session->transport_frame(),
+ error,
+ timestamp - last_timestamp,
+ one_ppqn_in_frames,
+ (t1 -t0) * session->frame_rate(),
+ t0 * session->frame_rate(),
+ t1 * session->frame_rate(),
+ session->frame_rate(),
+ ((t1 - t0) * session->frame_rate()) / one_ppqn_in_frames));
+
+ last_timestamp = timestamp;
+}
+
+void
+MIDIClock_Slave::start (Parser& /*parser*/, framepos_t timestamp)
+{
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MIDIClock_Slave got start message at time %1 engine time %2\n", timestamp, session->frame_time()));
+
+ if (!_started) {
+ reset();
+
+ _started = true;
+ _starting = true;
+
+ should_be_position = session->transport_frame();
+ }
+}
+
+void
+MIDIClock_Slave::reset ()
+{
+ should_be_position = session->transport_frame();
+ last_timestamp = 0;
+
_starting = true;
+ _started = true;
+
+ // session->request_locate(0, false);
}
void
-MIDIClock_Slave::stop (Parser& parser, nframes_t timestamp)
+MIDIClock_Slave::contineu (Parser& /*parser*/, framepos_t /*timestamp*/)
{
- //std::cerr << "MIDIClock_Slave got stop message" << endl;
-
- current_midi_clock_frame_duration = 0;
-
- current.guard1++;
- current.position = 0;
- current_position = 0;
- current.timestamp = 0;
- current.guard2++;
-
- _started = false;
- reset();
+ DEBUG_TRACE (DEBUG::MidiClock, "MIDIClock_Slave got continue message\n");
+
+ if (!_started) {
+ _starting = true;
+ _started = true;
+ }
}
+
void
-MIDIClock_Slave::read_current (SafeTime *st) const
+MIDIClock_Slave::stop (Parser& /*parser*/, framepos_t /*timestamp*/)
{
- int tries = 0;
- do {
- if (tries == 10) {
- error << _("MIDI Clock Slave: atomic read of current time failed, sleeping!") << endmsg;
- usleep (20);
- tries = 0;
- }
-
- *st = current;
- tries++;
-
- } while (st->guard1 != st->guard2);
+ DEBUG_TRACE (DEBUG::MidiClock, "MIDIClock_Slave got stop message\n");
+
+ if (_started || _starting) {
+ _starting = false;
+ _started = false;
+ // locate to last MIDI clock position
+ session->request_transport_speed(0.0);
+
+ // we need to go back to the last MIDI beat (6 ppqn)
+ // and lets hope the tempo didnt change in the meantime :)
+
+ // begin at the should be position, because
+ // that is the position of the last MIDI Clock
+ // message and that is probably what the master
+ // expects where we are right now
+ framepos_t stop_position = should_be_position;
+
+ // find out the last MIDI beat: go back #midi_clocks mod 6
+ // and lets hope the tempo didnt change in those last 6 beats :)
+ stop_position -= (midi_clock_count % 6) * one_ppqn_in_frames;
+
+ session->request_locate(stop_position, false);
+ should_be_position = stop_position;
+ last_timestamp = 0;
+ }
+}
+
+void
+MIDIClock_Slave::position (Parser& /*parser*/, byte* message, size_t size)
+{
+ // we are note supposed to get position messages while we are running
+ // so lets be robust and ignore those
+ if (_started || _starting) {
+ return;
+ }
+
+ assert(size == 3);
+ byte lsb = message[1];
+ byte msb = message[2];
+ assert((lsb <= 0x7f) && (msb <= 0x7f));
+
+ uint16_t position_in_sixteenth_notes = (uint16_t(msb) << 7) | uint16_t(lsb);
+ framepos_t position_in_frames = calculate_song_position(position_in_sixteenth_notes);
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Song Position: %1 frames: %2\n", position_in_sixteenth_notes, position_in_frames));
+
+ session->request_locate(position_in_frames, false);
+ should_be_position = position_in_frames;
+ last_timestamp = 0;
+
}
bool
}
bool
-MIDIClock_Slave::speed_and_position (float& speed, nframes_t& pos)
+MIDIClock_Slave::starting() const
{
- if (!_started) {
+ return false;
+}
+
+bool
+MIDIClock_Slave::stop_if_no_more_clock_events(framepos_t& pos, framepos_t now)
+{
+ /* no timecode for 1/4 second ? conclude that its stopped */
+ if (last_timestamp &&
+ now > last_timestamp &&
+ now - last_timestamp > session->frame_rate() / 4) {
+ DEBUG_TRACE (DEBUG::MidiClock, "No MIDI Clock frames received for some time, stopping!\n");
+ pos = should_be_position;
+ session->request_transport_speed (0);
+ session->request_locate (should_be_position, false);
+ return true;
+ } else {
+ return false;
+ }
+}
+
+bool
+MIDIClock_Slave::speed_and_position (double& speed, framepos_t& pos)
+{
+ if (!_started || _starting) {
speed = 0.0;
- pos = 0;
+ pos = should_be_position;
return true;
}
-
- nframes_t now = session.engine().frame_time();
- SafeTime last;
- read_current (&last);
- /* no timecode for 1/4 second ? conclude that its stopped */
- if (last_inbound_frame &&
- now > last_inbound_frame &&
- now - last_inbound_frame > session.frame_rate() / 4) {
- //cerr << "No MIDI Clock frames received for some time, stopping!" << endl;
- pos = last.position;
- session.request_locate (pos, false);
- session.request_transport_speed (0);
- this->stop(*port->input(), now);
- reset();
+ framepos_t engine_now = session->frame_time();
+
+ if (stop_if_no_more_clock_events(pos, engine_now)) {
return false;
}
- //cerr << " now: " << now << " last: " << last.timestamp;
-
// calculate speed
- double speed_double = one_ppqn_in_frames / average_midi_clock_frame_duration;
- speed = float(speed_double);
- //cerr << " final speed: " << speed;
-
+ speed = ((t1 - t0) * session->frame_rate()) / one_ppqn_in_frames;
+
+ // provide a 3% deadzone to lock the speed
+ if (fabs(speed - 1.0) <= 0.03)
+ speed = 1.0;
+
// calculate position
- if (now > last.timestamp) {
+ if (engine_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);
+ framecnt_t elapsed = engine_now - last_timestamp;
+ pos = (framepos_t) (should_be_position + double(elapsed) * speed);
} else {
// A new MIDI clock message has arrived this cycle
- pos = current_position;
+ pos = should_be_position;
}
-
- /*
- cerr << " transport position now: " << session.transport_frame();
- cerr << " calculated position: " << pos;
- cerr << endl;
- */
-
- // we want start on frame 0 on the first call after a MIDI start
- if (_starting) {
- pos = 0;
- _starting = false;
- }
-
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("speed_and_position: %1 & %2 <-> %3 (transport)\n", speed, pos, session->transport_frame()));
+
return true;
}
-ARDOUR::nframes_t
+ARDOUR::framecnt_t
MIDIClock_Slave::resolution() const
{
- return (nframes_t) one_ppqn_in_frames * 24;
+ // one beat
+ return (framecnt_t) one_ppqn_in_frames * ppqn;
}
-void
-MIDIClock_Slave::reset ()
-{
-
- last_inbound_frame = 0;
- current.guard1++;
- current.position = 0;
- current_position = 0;
- current.timestamp = 0;
- current.guard2++;
-
- session.request_locate(0, false);
-}
projects / ardour.git / blobdiff