366 lines
10 KiB
C++
366 lines
10 KiB
C++
/*
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Copyright (C) 2008 Paul Davis
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Author: Hans Baier
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <cmath>
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#include <errno.h>
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#include <poll.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "pbd/error.h"
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#include "pbd/failed_constructor.h"
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#include "pbd/pthread_utils.h"
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#include "midi++/port.h"
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#include "midi++/jack.h"
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#include "ardour/debug.h"
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#include "ardour/slave.h"
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#include "ardour/session.h"
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#include "ardour/audioengine.h"
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#include "ardour/cycles.h"
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#include "ardour/tempo.h"
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#include "i18n.h"
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using namespace std;
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using namespace ARDOUR;
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using namespace MIDI;
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using namespace PBD;
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#define DEBUG_MIDI_CLOCK 1
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MIDIClock_Slave::MIDIClock_Slave (Session& s, MIDI::Port& p, int ppqn)
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: ppqn (ppqn)
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, bandwidth (1.0 / 60.0) // 1 BpM = 1 / 60 Hz
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{
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session = (ISlaveSessionProxy *) new SlaveSessionProxy(s);
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rebind (p);
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reset ();
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}
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MIDIClock_Slave::MIDIClock_Slave (ISlaveSessionProxy* session_proxy, int ppqn)
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: session(session_proxy)
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, ppqn (ppqn)
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, bandwidth (1.0 / 60.0) // 1 BpM = 1 / 60 Hz
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{
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reset ();
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}
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MIDIClock_Slave::~MIDIClock_Slave()
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{
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delete session;
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}
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void
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MIDIClock_Slave::rebind (MIDI::Port& p)
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{
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port_connections.drop_connections();
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port = &p;
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MIDIClock_Slave: connecting to port %1\n", port->name()));
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port->input()->timing.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::update_midi_clock, this, _1, _2));
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port->input()->start.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::start, this, _1, _2));
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port->input()->contineu.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::contineu, this, _1, _2));
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port->input()->stop.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::stop, this, _1, _2));
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port->input()->position.connect_same_thread (port_connections, boost::bind (&MIDIClock_Slave::position, this, _1, _2, 3));
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}
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void
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MIDIClock_Slave::calculate_one_ppqn_in_frames_at(nframes64_t time)
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{
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const Tempo& current_tempo = session->tempo_map().tempo_at(time);
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const Meter& current_meter = session->tempo_map().meter_at(time);
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double frames_per_beat =
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current_tempo.frames_per_beat(session->frame_rate(),
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current_meter);
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double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
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double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
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one_ppqn_in_frames = frames_per_quarter_note / double (ppqn);
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// DEBUG_TRACE (DEBUG::MidiClock, string_compose ("at %1, one ppqn = %2\n", time, one_ppqn_in_frames));
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}
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ARDOUR::nframes64_t
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MIDIClock_Slave::calculate_song_position(uint16_t song_position_in_sixteenth_notes)
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{
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nframes64_t song_position_frames = 0;
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for (uint16_t i = 1; i <= song_position_in_sixteenth_notes; ++i) {
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// one quarter note contains ppqn pulses, so a sixteenth note is ppqn / 4 pulses
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calculate_one_ppqn_in_frames_at(song_position_frames);
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song_position_frames += one_ppqn_in_frames * (nframes64_t)(ppqn / 4);
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}
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return song_position_frames;
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}
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void
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MIDIClock_Slave::calculate_filter_coefficients()
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{
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// omega = 2 * PI * Bandwidth / MIDI clock frame frequency in Hz
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omega = 2.0 * M_PI * bandwidth * one_ppqn_in_frames / session->frame_rate();
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b = 1.4142135623730950488 * omega;
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c = omega * omega;
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}
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void
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MIDIClock_Slave::update_midi_clock (Parser& /*parser*/, nframes64_t timestamp)
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{
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// some pieces of hardware send MIDI Clock all the time
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if ( (!_starting) && (!_started) ) {
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return;
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}
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calculate_one_ppqn_in_frames_at(should_be_position);
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nframes64_t elapsed_since_start = timestamp - first_timestamp;
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double error = 0;
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if (_starting || last_timestamp == 0) {
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midi_clock_count = 0;
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first_timestamp = timestamp;
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elapsed_since_start = should_be_position;
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// calculate filter coefficients
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calculate_filter_coefficients();
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// initialize DLL
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e2 = double(one_ppqn_in_frames) / double(session->frame_rate());
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t0 = double(elapsed_since_start) / double(session->frame_rate());
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t1 = t0 + e2;
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// let ardour go after first MIDI Clock Event
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_starting = false;
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} else {
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midi_clock_count++;
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should_be_position += one_ppqn_in_frames;
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calculate_filter_coefficients();
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// calculate loop error
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// we use session->audible_frame() instead of t1 here
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// because t1 is used to calculate the transport speed,
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// so the loop will compensate for accumulating rounding errors
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error = (double(should_be_position) - double(session->audible_frame()));
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e = error / double(session->frame_rate());
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// update DLL
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t0 = t1;
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t1 += b * e + e2;
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e2 += c * e;
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}
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("clock #%1 @ %2 arrived %3 (theoretical) audible %4 transport %5 error %6 "
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"read delta %7 should-be delta %8 t1-t0 %9 t0 %10 t1 %11 framerate %12 appspeed %13\n",
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midi_clock_count,
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elapsed_since_start,
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should_be_position,
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session->audible_frame(),
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session->transport_frame(),
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error,
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timestamp - last_timestamp,
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one_ppqn_in_frames,
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(t1 -t0) * session->frame_rate(),
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t0 * session->frame_rate(),
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t1 * session->frame_rate(),
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session->frame_rate(),
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((t1 - t0) * session->frame_rate()) / one_ppqn_in_frames));
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last_timestamp = timestamp;
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}
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void
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MIDIClock_Slave::start (Parser& /*parser*/, nframes64_t timestamp)
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{
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("MIDIClock_Slave got start message at time %1 engine time %2\n", timestamp, session->frame_time()));
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if (!_started) {
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reset();
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_started = true;
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_starting = true;
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should_be_position = session->transport_frame();
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}
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}
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void
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MIDIClock_Slave::reset ()
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{
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should_be_position = session->transport_frame();
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last_timestamp = 0;
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_starting = true;
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_started = true;
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// session->request_locate(0, false);
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}
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void
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MIDIClock_Slave::contineu (Parser& /*parser*/, nframes64_t /*timestamp*/)
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{
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DEBUG_TRACE (DEBUG::MidiClock, "MIDIClock_Slave got continue message\n");
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if (!_started) {
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_starting = true;
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_started = true;
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}
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}
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void
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MIDIClock_Slave::stop (Parser& /*parser*/, nframes64_t /*timestamp*/)
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{
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DEBUG_TRACE (DEBUG::MidiClock, "MIDIClock_Slave got stop message\n");
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if (_started || _starting) {
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_starting = false;
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_started = false;
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// locate to last MIDI clock position
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session->request_transport_speed(0.0);
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// we need to go back to the last MIDI beat (6 ppqn)
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// and lets hope the tempo didnt change in the meantime :)
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// begin at the should be position, because
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// that is the position of the last MIDI Clock
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// message and that is probably what the master
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// expects where we are right now
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nframes64_t stop_position = should_be_position;
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// find out the last MIDI beat: go back #midi_clocks mod 6
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// and lets hope the tempo didnt change in those last 6 beats :)
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stop_position -= (midi_clock_count % 6) * one_ppqn_in_frames;
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session->request_locate(stop_position, false);
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should_be_position = stop_position;
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last_timestamp = 0;
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}
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}
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void
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MIDIClock_Slave::position (Parser& /*parser*/, byte* message, size_t size)
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{
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// we are note supposed to get position messages while we are running
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// so lets be robust and ignore those
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if (_started || _starting) {
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return;
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}
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assert(size == 3);
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byte lsb = message[1];
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byte msb = message[2];
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assert((lsb <= 0x7f) && (msb <= 0x7f));
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uint16_t position_in_sixteenth_notes = (uint16_t(msb) << 7) | uint16_t(lsb);
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nframes64_t position_in_frames = calculate_song_position(position_in_sixteenth_notes);
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Song Position: %1 frames: %2\n", position_in_sixteenth_notes, position_in_frames));
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session->request_locate(position_in_frames, false);
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should_be_position = position_in_frames;
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last_timestamp = 0;
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}
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bool
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MIDIClock_Slave::locked () const
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{
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return true;
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}
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bool
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MIDIClock_Slave::ok() const
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{
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return true;
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}
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bool
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MIDIClock_Slave::starting() const
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{
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return false;
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}
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bool
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MIDIClock_Slave::stop_if_no_more_clock_events(nframes64_t& pos, nframes64_t now)
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{
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/* no timecode for 1/4 second ? conclude that its stopped */
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if (last_timestamp &&
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now > last_timestamp &&
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now - last_timestamp > session->frame_rate() / 4) {
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DEBUG_TRACE (DEBUG::MidiClock, "No MIDI Clock frames received for some time, stopping!\n");
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pos = should_be_position;
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session->request_transport_speed (0);
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session->request_locate (should_be_position, false);
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return true;
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} else {
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return false;
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}
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}
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bool
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MIDIClock_Slave::speed_and_position (double& speed, nframes64_t& pos)
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{
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if (!_started || _starting) {
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speed = 0.0;
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pos = should_be_position;
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return true;
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}
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nframes64_t engine_now = session->frame_time();
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if (stop_if_no_more_clock_events(pos, engine_now)) {
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return false;
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}
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// calculate speed
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speed = ((t1 - t0) * session->frame_rate()) / one_ppqn_in_frames;
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// provide a 3% deadzone to lock the speed
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if (fabs(speed - 1.0) <= 0.03)
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speed = 1.0;
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// calculate position
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if (engine_now > last_timestamp) {
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// we are in between MIDI clock messages
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// so we interpolate position according to speed
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nframes64_t elapsed = engine_now - last_timestamp;
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pos = (nframes64_t) (should_be_position + double(elapsed) * speed);
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} else {
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// A new MIDI clock message has arrived this cycle
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pos = should_be_position;
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}
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("speed_and_position: %1 & %2 <-> %3 (transport)\n", speed, pos, session->transport_frame()));
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return true;
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}
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ARDOUR::nframes_t
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MIDIClock_Slave::resolution() const
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{
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// one beat
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return (nframes_t) one_ppqn_in_frames * ppqn;
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}
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