/*
- 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 <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 "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/slave.h>
-#include <ardour/session.h>
-#include <ardour/audioengine.h>
-#include <ardour/cycles.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)
+ : ppqn (ppqn)
+ , bandwidth (30.0 / 60.0) // 1 BpM = 1 / 60 Hz
{
+ session = (ISlaveSessionProxy *) new SlaveSessionProxy(s);
rebind (p);
reset ();
}
+MIDIClock_Slave::MIDIClock_Slave (ISlaveSessionProxy* session_proxy, int ppqn)
+ : session(session_proxy)
+ , ppqn (ppqn)
+ , bandwidth (30.0 / 60.0) // 1 BpM = 1 / 60 Hz
+{
+ session = session_proxy;
+ reset ();
+}
+
MIDIClock_Slave::~MIDIClock_Slave()
{
+ delete session;
}
void
port = &p;
- std::cerr << "MIDIClock_Slave: connecting to port " << port->name() << std::endl;
+ #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)));
+ connections.push_back (port->input()->position.connect (mem_fun (*this, &MIDIClock_Slave::position)));
}
-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_tempo.frames_per_beat(session->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;
+ one_ppqn_in_frames = frames_per_quarter_note / double (ppqn);
+}
- /*
- Also compensate for audio latency.
- */
+ARDOUR::nframes_t
+MIDIClock_Slave::calculate_song_position(uint16_t song_position_in_sixteenth_notes)
+{
+ nframes_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 * nframes_t(ppqn / 4);
+ }
+
+ return song_position_frames;
+}
- midi_clock_frame += (long) (one_ppqn_in_frames)
- + session.worst_output_latency();
+void
+MIDIClock_Slave::calculate_filter_coefficients()
+{
+ // omega = 2 * PI * Bandwidth / MIDI clock frame frequency in Hz
+ omega = 2.0 * 3.14159265358979323846 * bandwidth * one_ppqn_in_frames / session->frame_rate();
+ b = 1.4142135623730950488 * omega;
+ c = omega * omega;
+}
- /*
- std::cerr << "got MIDI Clock message at time " << now
- << " result: " << midi_clock_frame
- << " open_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;
+void
+MIDIClock_Slave::update_midi_clock (Parser& parser, nframes_t timestamp)
+{
+ // some pieces of hardware send MIDI Clock all the time
+ if ( (!_starting) && (!_started) ) {
+ return;
}
+
+ calculate_one_ppqn_in_frames_at(should_be_position);
+
+ nframes_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->transport_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;
+ }
+
+ #ifdef DEBUG_MIDI_CLOCK
+ cerr
+ << "MIDI Clock #" << midi_clock_count
+ //<< "@" << timestamp
+ << " arrived at: " << elapsed_since_start << " (elapsed time) "
+ << " should-be transport: " << should_be_position
+ << " audible: " << session->audible_frame()
+ << " real transport: " << session->transport_frame()
+ << " error: " << error
+ //<< " engine: " << session->frame_time()
+ << " real delta: " << timestamp - last_timestamp
+ << " should-be delta: " << one_ppqn_in_frames
+ << " t1-t0: " << (t1 -t0) * session->frame_rate()
+ << " t0: " << t0 * session->frame_rate()
+ << " t1: " << t1 * session->frame_rate()
+ << " frame-rate: " << session->frame_rate()
+ << endl;
+
+ cerr << "frames since cycle start: " << session->frames_since_cycle_start() << endl;
+ #endif // DEBUG_MIDI_CLOCK
+
+ last_timestamp = timestamp;
+}
- current.guard1++;
- current.position = midi_clock_frame;
- current.timestamp = now;
- current.guard2++;
-
- last_inbound_frame = now;
+void
+MIDIClock_Slave::start (Parser& parser, nframes_t timestamp)
+{
+ #ifdef DEBUG_MIDI_CLOCK
+ cerr << "MIDIClock_Slave got start message at time " << timestamp << " engine time: " << session->frame_time() << endl;
+ #endif
+
+ if (!_started) {
+ reset();
+
+ _started = true;
+ _starting = true;
+ }
}
void
-MIDIClock_Slave::start (Parser& parser)
+MIDIClock_Slave::reset ()
{
- std::cerr << "MIDIClock_Slave got start message" << endl;
- midi_clock_speed = 1.0f;
- _started = true;
+ should_be_position = 0;
+ last_timestamp = 0;
+
+ _starting = false;
+ _started = false;
+
+ session->request_locate(0, false);
}
void
-MIDIClock_Slave::stop (Parser& parser)
+MIDIClock_Slave::contineu (Parser& parser, nframes_t timestamp)
{
- std::cerr << "MIDIClock_Slave got stop message" << endl;
+ #ifdef DEBUG_MIDI_CLOCK
+ std::cerr << "MIDIClock_Slave got continue message" << endl;
+ #endif
+ if (!_started) {
+ _starting = true;
+ _started = true;
+ }
+}
- midi_clock_speed = 0.0f;
- midi_clock_frame = 0;
- _started = false;
- current.guard1++;
- current.position = midi_clock_frame;
- current.timestamp = 0;
- current.guard2++;
+void
+MIDIClock_Slave::stop (Parser& parser, nframes_t timestamp)
+{
+ #ifdef DEBUG_MIDI_CLOCK
+ std::cerr << "MIDIClock_Slave got stop message" << endl;
+ #endif
+
+ 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
+ nframes_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::read_current (SafeTime *st) const
+MIDIClock_Slave::position (Parser& parser, byte* message, size_t size)
{
- 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);
+ // 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);
+ nframes_t position_in_frames = calculate_song_position(position_in_sixteenth_notes);
+
+ #ifdef DEBUG_MIDI_CLOCK
+ cerr << "Song Position: " << position_in_sixteenth_notes << " frames: " << position_in_frames << endl;
+ #endif
+
+ 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
{
- //std::cerr << "MIDIClock_Slave speed and position() called" << endl;
+ return false;
+}
- if(_started == false) {
- speed = 0.0;
- pos = 0;
+bool
+MIDIClock_Slave::stop_if_no_more_clock_events(nframes_t& pos, nframes_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) {
+ #ifdef DEBUG_MIDI_CLOCK
+ cerr << "No MIDI Clock frames received for some time, stopping!" << endl;
+ #endif
+ pos = should_be_position;
+ session->request_transport_speed (0);
+ session->request_locate (should_be_position, false);
+ return true;
+ } else {
+ return false;
}
-
- 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;
+bool
+MIDIClock_Slave::speed_and_position (double& speed, nframes_t& pos)
+{
+ if (!_started || _starting) {
+ speed = 0.0;
+ pos = should_be_position;
return true;
}
-
- /* 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;
- pos = last.position;
- session.request_locate (pos, false);
- session.request_transport_speed (0);
- this->stop(*port->input());
- reset();
+
+ nframes_t engine_now = session->frame_time();
+
+ if (stop_if_no_more_clock_events(pos, engine_now)) {
return false;
}
- speed_now = (float) ((last.position - first_midi_clock_frame) / (double) (now - first_midi_clock_time));
-
- cerr << "speed_and_position: speed_now: " << speed_now ;
+ // calculate speed
+ speed = ((t1 - t0) * session->frame_rate()) / one_ppqn_in_frames;
- midi_clock_speed = speed_now;
-
- if (midi_clock_speed == 0.0f) {
-
- elapsed = 0;
-
+ // calculate position
+ if (engine_now > last_timestamp) {
+ // we are in between MIDI clock messages
+ // so we interpolate position according to speed
+ nframes_t elapsed = engine_now - last_timestamp;
+ pos = nframes_t (should_be_position + double(elapsed) * speed);
} 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 = should_be_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;
+ #ifdef DEBUG_MIDI_CLOCK
+ cerr << "speed_and_position: " << speed << " & " << pos << " <-> " << session->transport_frame() << " (transport)" << endl;
+ #endif
+
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.timestamp = 0;
- current.guard2++;
- first_midi_clock_frame = 0;
- first_midi_clock_time = 0;
-
- accumulator_index = 0;
- have_first_accumulated_speed = false;
- midi_clock_speed = 0;
-}
projects / ardour.git / blobdiff