using namespace std;
using namespace ARDOUR;
-using namespace sigc;
using namespace MIDI;
using namespace PBD;
port = &p;
- #ifdef DEBUG_MIDI_CLOCK
+ #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()->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)));
+ connections.push_back (port->input()->timing.connect (sigc::mem_fun (*this, &MIDIClock_Slave::update_midi_clock)));
+ connections.push_back (port->input()->start.connect (sigc::mem_fun (*this, &MIDIClock_Slave::start)));
+ connections.push_back (port->input()->contineu.connect (sigc::mem_fun (*this, &MIDIClock_Slave::contineu)));
+ connections.push_back (port->input()->stop.connect (sigc::mem_fun (*this, &MIDIClock_Slave::stop)));
+ connections.push_back (port->input()->position.connect (sigc::mem_fun (*this, &MIDIClock_Slave::position)));
}
-void
-MIDIClock_Slave::calculate_one_ppqn_in_frames_at(nframes_t time)
+void
+MIDIClock_Slave::calculate_one_ppqn_in_frames_at(nframes64_t time)
{
const Tempo& current_tempo = session->tempo_map().tempo_at(time);
const Meter& current_meter = session->tempo_map().meter_at(time);
one_ppqn_in_frames = frames_per_quarter_note / double (ppqn);
}
-ARDOUR::nframes_t
+ARDOUR::nframes64_t
MIDIClock_Slave::calculate_song_position(uint16_t song_position_in_sixteenth_notes)
{
- nframes_t song_position_frames = 0;
+ nframes64_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);
+ song_position_frames += one_ppqn_in_frames * (nframes64_t)(ppqn / 4);
}
-
+
return song_position_frames;
}
-void
+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;
+ c = omega * omega;
}
void
-MIDIClock_Slave::update_midi_clock (Parser& /*parser*/, nframes_t timestamp)
-{
- // some pieces of hardware send MIDI Clock all the time
+MIDIClock_Slave::update_midi_clock (Parser& /*parser*/, nframes64_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;
+
+ nframes64_t elapsed_since_start = timestamp - first_timestamp;
double error = 0;
-
- if (_starting || last_timestamp == 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 {
+ } else {
midi_clock_count++;
should_be_position += one_ppqn_in_frames;
calculate_filter_coefficients();
// 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()));
+ 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
+ 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
+ //<< "@" << 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
+ //<< " 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()
+ << " 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
}
void
-MIDIClock_Slave::start (Parser& /*parser*/, nframes_t /*timestamp*/)
-{
- #ifdef DEBUG_MIDI_CLOCK
+MIDIClock_Slave::start (Parser& /*parser*/, nframes64_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;
}
MIDIClock_Slave::reset ()
{
- should_be_position = 0;
+ should_be_position = 0;
last_timestamp = 0;
-
+
_starting = false;
_started = false;
-
+
session->request_locate(0, false);
}
void
-MIDIClock_Slave::contineu (Parser& /*parser*/, nframes_t /*timestamp*/)
+MIDIClock_Slave::contineu (Parser& /*parser*/, nframes64_t /*timestamp*/)
{
- #ifdef DEBUG_MIDI_CLOCK
+ #ifdef DEBUG_MIDI_CLOCK
std::cerr << "MIDIClock_Slave got continue message" << endl;
#endif
if (!_started) {
_starting = true;
- _started = true;
+ _started = true;
}
}
void
-MIDIClock_Slave::stop (Parser& /*parser*/, nframes_t /*timestamp*/)
+MIDIClock_Slave::stop (Parser& /*parser*/, nframes64_t /*timestamp*/)
{
- #ifdef DEBUG_MIDI_CLOCK
+ #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;
-
+ nframes64_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;
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);
-
+ nframes64_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;
+ 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::stop_if_no_more_clock_events(nframes_t& pos, nframes_t now)
+MIDIClock_Slave::stop_if_no_more_clock_events(nframes64_t& pos, nframes64_t now)
{
/* no timecode for 1/4 second ? conclude that its stopped */
- if (last_timestamp &&
- now > last_timestamp &&
+ if (last_timestamp &&
+ now > last_timestamp &&
now - last_timestamp > session->frame_rate() / 4) {
- #ifdef DEBUG_MIDI_CLOCK
+ #ifdef DEBUG_MIDI_CLOCK
cerr << "No MIDI Clock frames received for some time, stopping!" << endl;
- #endif
+ #endif
pos = should_be_position;
session->request_transport_speed (0);
session->request_locate (should_be_position, false);
}
bool
-MIDIClock_Slave::speed_and_position (double& speed, nframes_t& pos)
+MIDIClock_Slave::speed_and_position (double& speed, nframes64_t& pos)
{
if (!_started || _starting) {
speed = 0.0;
pos = should_be_position;
return true;
}
-
- nframes_t engine_now = session->frame_time();
-
+
+ nframes64_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;
-
+
// 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);
+ nframes64_t elapsed = engine_now - last_timestamp;
+ pos = (nframes64_t) (should_be_position + double(elapsed) * speed);
} else {
// A new MIDI clock message has arrived this cycle
pos = should_be_position;
}
-
- #ifdef DEBUG_MIDI_CLOCK
+
+ #ifdef DEBUG_MIDI_CLOCK
cerr << "speed_and_position: " << speed << " & " << pos << " <-> " << session->transport_frame() << " (transport)" << endl;
- #endif
-
+ #endif
+
return true;
}
projects / ardour.git / blobdiff