380 lines
11 KiB
C++
380 lines
11 KiB
C++
/*
|
|
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
|
|
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.
|
|
|
|
*/
|
|
|
|
#include <cmath>
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include "pbd/error.h"
|
|
#include "pbd/failed_constructor.h"
|
|
#include "pbd/pthread_utils.h"
|
|
#include "pbd/convert.h"
|
|
|
|
#include "midi++/port.h"
|
|
|
|
#include "ardour/debug.h"
|
|
#include "ardour/midi_buffer.h"
|
|
#include "ardour/midi_port.h"
|
|
#include "ardour/slave.h"
|
|
#include "ardour/tempo.h"
|
|
|
|
#include "i18n.h"
|
|
|
|
using namespace std;
|
|
using namespace ARDOUR;
|
|
using namespace MIDI;
|
|
using namespace PBD;
|
|
|
|
MIDIClock_Slave::MIDIClock_Slave (Session& s, MidiPort& p, int ppqn)
|
|
: ppqn (ppqn)
|
|
, bandwidth (2.0 / 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 (2.0 / 60.0) // 1 BpM = 1 / 60 Hz
|
|
{
|
|
reset ();
|
|
}
|
|
|
|
MIDIClock_Slave::~MIDIClock_Slave()
|
|
{
|
|
delete session;
|
|
}
|
|
|
|
void
|
|
MIDIClock_Slave::rebind (MidiPort& port)
|
|
{
|
|
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MIDIClock_Slave: connecting to port %1\n", port.name()));
|
|
|
|
port_connections.drop_connections ();
|
|
|
|
port.self_parser().timing.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::update_midi_clock, this, _1, _2));
|
|
port.self_parser().start.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::start, this, _1, _2));
|
|
port.self_parser().contineu.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::contineu, this, _1, _2));
|
|
port.self_parser().stop.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::stop, this, _1, _2));
|
|
port.self_parser().position.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::position, this, _1, _2, 3));
|
|
|
|
}
|
|
|
|
void
|
|
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);
|
|
// 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);
|
|
}
|
|
|
|
return song_position_frames;
|
|
}
|
|
|
|
void
|
|
MIDIClock_Slave::calculate_filter_coefficients()
|
|
{
|
|
// 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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
pframes_t cycle_offset = timestamp - session->sample_time_at_cycle_start();
|
|
|
|
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;
|
|
|
|
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("first clock message after start received @ %1\n", timestamp));
|
|
|
|
// 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->transport_frame()) + double(cycle_offset)));
|
|
e = error / double(session->frame_rate());
|
|
current_delta = error;
|
|
|
|
// update DLL
|
|
t0 = t1;
|
|
t1 += b * e + e2;
|
|
e2 += c * e;
|
|
}
|
|
|
|
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("clock #%1 @ %2 should-be %3 transport %4 error %5 appspeed %6 "
|
|
"read-delta %7 should-be delta %8 t1-t0 %9 t0 %10 t1 %11 framerate %12 engine %13\n",
|
|
midi_clock_count, // #
|
|
elapsed_since_start, // @
|
|
should_be_position, // should-be
|
|
session->transport_frame(), // transport
|
|
error, // error
|
|
((t1 - t0) * session->frame_rate()) / one_ppqn_in_frames, // appspeed
|
|
timestamp - last_timestamp, // read delta
|
|
one_ppqn_in_frames, // should-be delta
|
|
(t1 - t0) * session->frame_rate(), // t1-t0
|
|
t0 * session->frame_rate(), // t0
|
|
t1 * session->frame_rate(), // t1
|
|
session->frame_rate(), // framerate
|
|
session->frame_time()
|
|
|
|
));
|
|
|
|
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 transport_frame %3\n", timestamp, session->frame_time(), session->transport_frame()));
|
|
|
|
if (!_started) {
|
|
reset();
|
|
|
|
_started = true;
|
|
_starting = true;
|
|
|
|
should_be_position = session->transport_frame();
|
|
}
|
|
}
|
|
|
|
void
|
|
MIDIClock_Slave::reset ()
|
|
{
|
|
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MidiClock_Slave reset(): calculated filter bandwidth is %1 for period size %2\n", bandwidth, session->frames_per_cycle()));
|
|
|
|
should_be_position = session->transport_frame();
|
|
last_timestamp = 0;
|
|
|
|
_starting = true;
|
|
_started = true;
|
|
|
|
// session->request_locate(0, false);
|
|
current_delta = 0;
|
|
}
|
|
|
|
void
|
|
MIDIClock_Slave::contineu (Parser& /*parser*/, framepos_t /*timestamp*/)
|
|
{
|
|
DEBUG_TRACE (DEBUG::MidiClock, "MIDIClock_Slave got continue message\n");
|
|
|
|
if (!_started) {
|
|
_starting = true;
|
|
_started = true;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
MIDIClock_Slave::stop (Parser& /*parser*/, framepos_t /*timestamp*/)
|
|
{
|
|
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*/, MIDI::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);
|
|
MIDI::byte lsb = message[1];
|
|
MIDI::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
|
|
MIDIClock_Slave::locked () const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
MIDIClock_Slave::ok() const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
MIDIClock_Slave::starting() const
|
|
{
|
|
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 = should_be_position;
|
|
return true;
|
|
}
|
|
|
|
framepos_t engine_now = session->frame_time();
|
|
|
|
if (stop_if_no_more_clock_events(pos, engine_now)) {
|
|
return false;
|
|
}
|
|
|
|
// calculate speed
|
|
speed = ((t1 - t0) * session->frame_rate()) / one_ppqn_in_frames;
|
|
|
|
// provide a 0.1% deadzone to lock the speed
|
|
if (fabs(speed - 1.0) <= 0.001)
|
|
speed = 1.0;
|
|
|
|
// calculate position
|
|
if (engine_now > last_timestamp) {
|
|
// we are in between MIDI clock messages
|
|
// so we interpolate position according to speed
|
|
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 = should_be_position;
|
|
}
|
|
|
|
DEBUG_TRACE (DEBUG::MidiClock, string_compose ("speed_and_position: speed %1 should-be %2 transport %3 \n", speed, pos, session->transport_frame()));
|
|
|
|
return true;
|
|
}
|
|
|
|
ARDOUR::framecnt_t
|
|
MIDIClock_Slave::resolution() const
|
|
{
|
|
// one beat
|
|
return (framecnt_t) one_ppqn_in_frames * ppqn;
|
|
}
|
|
|
|
std::string
|
|
MIDIClock_Slave::approximate_current_delta() const
|
|
{
|
|
char delta[80];
|
|
if (last_timestamp == 0 || _starting) {
|
|
snprintf(delta, sizeof(delta), "\u2012\u2012\u2012\u2012");
|
|
} else {
|
|
snprintf(delta, sizeof(delta), "\u0394<span foreground=\"green\" face=\"monospace\" >%s%s%" PRIi64 "</span>sm",
|
|
LEADINGZERO(abs(current_delta)), PLUSMINUS(-current_delta), abs(current_delta));
|
|
}
|
|
return std::string(delta);
|
|
}
|
|
|