#include <cmath>
#include <errno.h>
-#include <poll.h>
#include <sys/types.h>
#include <unistd.h>
#include "pbd/error.h"
#include "ardour/slave.h"
#include "ardour/tempo.h"
-#include "i18n.h"
+#include "pbd/i18n.h"
using namespace std;
using namespace ARDOUR;
MIDIClock_Slave::MIDIClock_Slave (Session& s, MidiPort& p, int ppqn)
: ppqn (ppqn)
- , bandwidth (10.0 / 60.0) // 1 BpM = 1 / 60 Hz
+ , bandwidth (2.0 / 60.0) // 1 BpM = 1 / 60 Hz
{
session = (ISlaveSessionProxy *) new SlaveSessionProxy(s);
rebind (p);
MIDIClock_Slave::MIDIClock_Slave (ISlaveSessionProxy* session_proxy, int ppqn)
: session(session_proxy)
, ppqn (ppqn)
- , bandwidth (10.0 / 60.0) // 1 BpM = 1 / 60 Hz
+ , bandwidth (2.0 / 60.0) // 1 BpM = 1 / 60 Hz
{
reset ();
}
}
void
-MIDIClock_Slave::calculate_one_ppqn_in_frames_at(framepos_t time)
+MIDIClock_Slave::calculate_one_ppqn_in_samples_at(samplepos_t time)
{
- const Tempo& current_tempo = session->tempo_map().tempo_at(time);
- double frames_per_beat = current_tempo.frames_per_beat(session->frame_rate());
+ const double samples_per_quarter_note = session->tempo_map().samples_per_quarter_note_at (time, session->sample_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));
+ one_ppqn_in_samples = samples_per_quarter_note / double (ppqn);
+ // DEBUG_TRACE (DEBUG::MidiClock, string_compose ("at %1, one ppqn = %2\n", time, one_ppqn_in_samples));
}
-ARDOUR::framepos_t
+ARDOUR::samplepos_t
MIDIClock_Slave::calculate_song_position(uint16_t song_position_in_sixteenth_notes)
{
- framepos_t song_position_frames = 0;
+ samplepos_t song_position_samples = 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);
+ calculate_one_ppqn_in_samples_at(song_position_samples);
+ song_position_samples += one_ppqn_in_samples * (samplepos_t)(ppqn / 4);
}
- return song_position_frames;
+ return song_position_samples;
}
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();
+ // omega = 2 * PI * Bandwidth / MIDI clock sample frequency in Hz
+ omega = 2.0 * M_PI * bandwidth * one_ppqn_in_samples / session->sample_rate();
b = 1.4142135623730950488 * omega;
c = omega * omega;
}
void
-MIDIClock_Slave::update_midi_clock (Parser& /*parser*/, framepos_t timestamp)
+MIDIClock_Slave::update_midi_clock (Parser& /*parser*/, samplepos_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);
+ pframes_t cycle_offset = timestamp - session->sample_time_at_cycle_start();
+
+ calculate_one_ppqn_in_samples_at(should_be_position);
- framepos_t elapsed_since_start = timestamp - first_timestamp;
+ samplepos_t elapsed_since_start = timestamp - first_timestamp;
double error = 0;
if (_starting || last_timestamp == 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());
+ e2 = double(one_ppqn_in_samples) / double(session->sample_rate());
+ t0 = double(elapsed_since_start) / double(session->sample_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;
+ should_be_position += one_ppqn_in_samples;
calculate_filter_coefficients();
// calculate loop error
- // we use session->transport_frame() instead of t1 here
+ // we use session->transport_sample() 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()));
- e = error / double(session->frame_rate());
+ error = (double(should_be_position) - (double(session->transport_sample()) + double(cycle_offset)));
+ e = error / double(session->sample_rate());
current_delta = error;
// update DLL
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));
+ 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_sample(), // transport
+ error, // error
+ ((t1 - t0) * session->sample_rate()) / one_ppqn_in_samples, // appspeed
+ timestamp - last_timestamp, // read delta
+ one_ppqn_in_samples, // should-be delta
+ (t1 - t0) * session->sample_rate(), // t1-t0
+ t0 * session->sample_rate(), // t0
+ t1 * session->sample_rate(), // t1
+ session->sample_rate(), // framerate
+ session->sample_time()
+
+ ));
last_timestamp = timestamp;
}
void
-MIDIClock_Slave::start (Parser& /*parser*/, framepos_t timestamp)
+MIDIClock_Slave::start (Parser& /*parser*/, samplepos_t timestamp)
{
- DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MIDIClock_Slave got start message at time %1 engine time %2\n", timestamp, session->frame_time()));
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MIDIClock_Slave got start message at time %1 engine time %2 transport_sample %3\n", timestamp, session->sample_time(), session->transport_sample()));
if (!_started) {
reset();
_started = true;
_starting = true;
- should_be_position = session->transport_frame();
+ should_be_position = session->transport_sample();
}
}
void
MIDIClock_Slave::reset ()
{
- should_be_position = session->transport_frame();
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MidiClock_Slave reset(): calculated filter bandwidth is %1 for period size %2\n", bandwidth, session->samples_per_cycle()));
+
+ should_be_position = session->transport_sample();
last_timestamp = 0;
_starting = true;
}
void
-MIDIClock_Slave::contineu (Parser& /*parser*/, framepos_t /*timestamp*/)
+MIDIClock_Slave::contineu (Parser& /*parser*/, samplepos_t /*timestamp*/)
{
DEBUG_TRACE (DEBUG::MidiClock, "MIDIClock_Slave got continue message\n");
void
-MIDIClock_Slave::stop (Parser& /*parser*/, framepos_t /*timestamp*/)
+MIDIClock_Slave::stop (Parser& /*parser*/, samplepos_t /*timestamp*/)
{
DEBUG_TRACE (DEBUG::MidiClock, "MIDIClock_Slave got stop message\n");
// 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;
+ samplepos_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;
+ stop_position -= (midi_clock_count % 6) * one_ppqn_in_samples;
session->request_locate(stop_position, false);
should_be_position = stop_position;
}
void
-MIDIClock_Slave::position (Parser& /*parser*/, byte* message, size_t size)
+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
}
assert(size == 3);
- byte lsb = message[1];
- byte msb = message[2];
+ 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);
+ samplepos_t position_in_samples = 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));
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Song Position: %1 samples: %2\n", position_in_sixteenth_notes, position_in_samples));
- session->request_locate(position_in_frames, false);
- should_be_position = position_in_frames;
+ session->request_locate(position_in_samples, false);
+ should_be_position = position_in_samples;
last_timestamp = 0;
}
}
bool
-MIDIClock_Slave::stop_if_no_more_clock_events(framepos_t& pos, framepos_t now)
+MIDIClock_Slave::stop_if_no_more_clock_events(samplepos_t& pos, samplepos_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");
+ now - last_timestamp > session->sample_rate() / 4) {
+ DEBUG_TRACE (DEBUG::MidiClock, "No MIDI Clock samples received for some time, stopping!\n");
pos = should_be_position;
session->request_transport_speed (0);
session->request_locate (should_be_position, false);
}
bool
-MIDIClock_Slave::speed_and_position (double& speed, framepos_t& pos)
+MIDIClock_Slave::speed_and_position (double& speed, samplepos_t& pos)
{
if (!_started || _starting) {
speed = 0.0;
return true;
}
- framepos_t engine_now = session->frame_time();
+ samplepos_t engine_now = session->sample_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;
+ speed = ((t1 - t0) * session->sample_rate()) / one_ppqn_in_samples;
// provide a 0.1% deadzone to lock the speed
if (fabs(speed - 1.0) <= 0.001)
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);
+ samplecnt_t elapsed = engine_now - last_timestamp;
+ pos = (samplepos_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: %1 & %2 <-> %3 (transport)\n", speed, pos, session->transport_frame()));
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("speed_and_position: speed %1 should-be %2 transport %3 \n", speed, pos, session->transport_sample()));
return true;
}
-ARDOUR::framecnt_t
+ARDOUR::samplecnt_t
MIDIClock_Slave::resolution() const
{
// one beat
- return (framecnt_t) one_ppqn_in_frames * ppqn;
+ return (samplecnt_t) one_ppqn_in_samples * ppqn;
}
std::string
projects / ardour.git / blobdiff