Split cycles are run as if they are an entire self-contained cycle, starting at zero and running for "nframes". We adjust the timing and position of data only when retrieving and writing it to Port buffers.
403 lines
10 KiB
C++
403 lines
10 KiB
C++
/*
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* Copyright (C) 2008-2009 Hans Baier <hansfbaier@googlemail.com>
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* Copyright (C) 2009-2011 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2009-2011 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2013-2015 Robin Gareus <robin@gareus.org>
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* Copyright (C) 2013 Michael Fisher <mfisher31@gmail.com>
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* Copyright (C) 2015-2016 Nick Mainsbridge <mainsbridge@gmail.com>
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*
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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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*
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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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "pbd/compose.h"
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#include "pbd/stacktrace.h"
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#include "evoral/midi_events.h"
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#include "ardour/async_midi_port.h"
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#include "ardour/audioengine.h"
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#include "ardour/midi_buffer.h"
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#include "ardour/midi_port.h"
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#include "ardour/lmath.h"
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#include "ardour/ticker.h"
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#include "ardour/session.h"
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#include "ardour/tempo.h"
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#include "ardour/debug.h"
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using namespace ARDOUR;
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using namespace PBD;
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/** MIDI Clock Position tracking */
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class MidiClockTicker::Position : public Timecode::BBT_Time
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{
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public:
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Position() : speed(0.0f), sample(0), midi_beats(0) { }
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~Position() { }
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/** Sync timing information taken from the given Session
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* @return True if timings differed
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*/
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bool sync (Session* s) {
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bool changed = false;
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double sp = s->transport_speed();
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samplecnt_t fr = s->transport_sample();
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if (speed != sp) {
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speed = sp;
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changed = true;
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}
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if (sample != fr) {
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sample = fr;
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changed = true;
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}
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/* Midi beats and clocks always gets updated for now */
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s->bbt_time (this->sample, *this);
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const TempoMap& tempo = s->tempo_map();
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const Meter& meter = tempo.meter_at_sample (sample);
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const double divisions = meter.divisions_per_bar();
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const double divisor = meter.note_divisor();
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const double qnote_scale = divisor * 0.25f;
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double mb;
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/** Midi Beats in terms of Song Position Pointer is equivalent to total
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* sixteenth notes at 'time'
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*/
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mb = (((bars - 1) * divisions) + beats - 1);
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mb += (double)ticks / (double)Position::ticks_per_beat * qnote_scale;
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mb *= 16.0f / divisor;
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if (mb != midi_beats) {
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midi_beats = mb;
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midi_clocks = midi_beats * 6.0f;
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changed = true;
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}
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return changed;
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}
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double speed;
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samplecnt_t sample;
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double midi_beats;
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double midi_clocks;
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void print (std::ostream& s) {
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s << "samples: " << sample << " midi beats: " << midi_beats << " speed: " << speed;
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}
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};
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MidiClockTicker::MidiClockTicker ()
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: _ppqn (24)
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, _last_tick (0.0)
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, _send_pos (false)
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, _send_state (false)
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{
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_pos.reset (new Position());
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}
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MidiClockTicker::~MidiClockTicker()
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{
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_pos.reset (0);
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}
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void
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MidiClockTicker::set_session (Session* s)
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{
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SessionHandlePtr::set_session (s);
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if (_session) {
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_session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
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_session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
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_session->Located.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::session_located, this));
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update_midi_clock_port();
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_pos->sync (_session);
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}
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}
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void
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MidiClockTicker::session_located()
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{
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Session Located: %1, speed: %2\n", _session->transport_sample(), _session->transport_speed()));
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if (!_session || !_pos->sync (_session)) {
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return;
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}
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_last_tick = _pos->sample;
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if (!Config->get_send_midi_clock()) {
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return;
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}
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_send_pos = true;
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}
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void
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MidiClockTicker::session_going_away ()
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{
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SessionHandlePtr::session_going_away();
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_midi_port.reset ();
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}
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void
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MidiClockTicker::update_midi_clock_port()
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{
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_midi_port = _session->midi_clock_output_port();
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}
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void
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MidiClockTicker::transport_state_changed()
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{
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if (_session->exporting()) {
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/* no midi clock during export, for now */
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return;
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}
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if (!_session->engine().running()) {
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/* Engine stopped, we can't do anything */
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return;
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}
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if (! _pos->sync (_session)) {
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return;
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}
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DEBUG_TRACE (DEBUG::MidiClock,
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string_compose ("Transport state change @ %4, speed: %1 position: %2 play loop: %3\n",
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_pos->speed, _pos->sample, _session->get_play_loop(), _pos->sample)
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);
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_last_tick = _pos->sample;
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if (! Config->get_send_midi_clock()) {
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return;
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}
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_send_state = true;
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// tick (_pos->sample);
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}
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void
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MidiClockTicker::transport_looped()
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{
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Location* loop_location = _session->locations()->auto_loop_location();
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assert(loop_location);
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DEBUG_TRACE (DEBUG::MidiClock,
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string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
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_session->transport_sample(), loop_location->start(), loop_location->end(), _session->get_play_loop())
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);
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// adjust _last_tick, so that the next MIDI clock message is sent
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// in due time (and the tick interval is still constant)
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samplecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
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if (loop_location->start() > elapsed_since_last_tick) {
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_last_tick = loop_location->start() - elapsed_since_last_tick;
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} else {
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_last_tick = 0;
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}
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}
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void
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MidiClockTicker::tick (const samplepos_t& /* transport_sample */, pframes_t nframes)
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{
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if (!Config->get_send_midi_clock() || _session == 0 || _midi_port == 0) {
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return;
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}
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if (_send_pos) {
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if (_pos->speed == 0.0f) {
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send_position_event (llrint (_pos->midi_beats), 0, nframes);
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} else if (_pos->speed == 1.0f) {
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send_stop_event (0, nframes);
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if (_pos->sample == 0) {
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send_start_event (0, nframes);
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} else {
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send_position_event (llrint (_pos->midi_beats), 0, nframes);
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send_continue_event (0, nframes);
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}
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} else {
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/* Varispeed not supported */
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}
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_send_pos = false;
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}
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if (_send_state) {
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if (_pos->speed == 1.0f) {
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if (_session->get_play_loop()) {
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assert(_session->locations()->auto_loop_location());
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if (_pos->sample == _session->locations()->auto_loop_location()->start()) {
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send_start_event (0, nframes);
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} else {
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send_continue_event (0, nframes);
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}
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} else if (_pos->sample == 0) {
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send_start_event (0, nframes);
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} else {
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send_continue_event (0, nframes);
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}
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// send_midi_clock_event (0);
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} else if (_pos->speed == 0.0f) {
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send_stop_event (0, nframes);
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send_position_event (llrint (_pos->midi_beats), 0, nframes);
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}
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_send_state = false;
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}
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if (_session->transport_speed() != 1.0f) {
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/* no varispeed support and nothing to do after this if stopped */
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return;
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}
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const samplepos_t end = _pos->sample + nframes;
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double iter = _last_tick;
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while (true) {
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double clock_delta = one_ppqn_in_samples (llrint (iter));
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double next_tick = iter + clock_delta;
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sampleoffset_t next_tick_offset = llrint (next_tick) - end;
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DEBUG_TRACE (DEBUG::MidiClock,
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string_compose ("Tick: iter: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
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iter, _last_tick, next_tick, next_tick_offset, nframes));
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if (next_tick_offset >= nframes) {
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break;
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}
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if (next_tick_offset >= 0) {
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send_midi_clock_event (next_tick_offset, nframes);
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}
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iter = next_tick;
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}
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_last_tick = iter;
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_pos->sample = end;
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}
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double
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MidiClockTicker::one_ppqn_in_samples (samplepos_t transport_position)
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{
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const double samples_per_quarter_note = _session->tempo_map().samples_per_quarter_note_at (transport_position, _session->nominal_sample_rate());
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return samples_per_quarter_note / double (_ppqn);
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}
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void
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MidiClockTicker::send_midi_clock_event (pframes_t offset, pframes_t nframes)
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{
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if (!_midi_port) {
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return;
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}
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static uint8_t msg = MIDI_CMD_COMMON_CLOCK;
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MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
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mb.push_back (offset, 1, &msg);
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));
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}
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void
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MidiClockTicker::send_start_event (pframes_t offset, pframes_t nframes)
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{
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if (!_midi_port) {
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return;
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}
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static uint8_t msg = { MIDI_CMD_COMMON_START };
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MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
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mb.push_back (offset, 1, &msg);
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Start %1\n", _last_tick));
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}
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void
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MidiClockTicker::send_continue_event (pframes_t offset, pframes_t nframes)
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{
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if (!_midi_port) {
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return;
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}
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static uint8_t msg = { MIDI_CMD_COMMON_CONTINUE };
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MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
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mb.push_back (offset, 1, &msg);
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Continue %1\n", _last_tick));
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}
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void
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MidiClockTicker::send_stop_event (pframes_t offset, pframes_t nframes)
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{
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if (!_midi_port) {
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return;
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}
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static uint8_t msg = MIDI_CMD_COMMON_STOP;
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MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
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mb.push_back (offset, 1, &msg);
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Stop %1\n", _last_tick));
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}
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void
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MidiClockTicker::send_position_event (uint32_t midi_beats, pframes_t offset, pframes_t nframes)
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{
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if (!_midi_port) {
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return;
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}
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/* can only use 14bits worth */
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if (midi_beats > 0x3fff) {
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return;
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}
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/* split midi beats into a 14bit value */
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MIDI::byte msg[3];
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msg[0] = MIDI_CMD_COMMON_SONG_POS;
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msg[1] = midi_beats & 0x007f;
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msg[2] = midi_beats >> 7;
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MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
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mb.push_back (offset, 3, &msg[0]);
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DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Song Position Sent: %1 to %2 (events now %3, buf = %4)\n", midi_beats, _midi_port->name(), mb.size(), &mb));
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}
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