key change: to sync with JACK always locate jack-position PLUS buffer-sized-rounded-worst_latency_preroll() ahead
307 lines
8.2 KiB
C++
307 lines
8.2 KiB
C++
/*
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* Copyright (C) 2005-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2006-2013 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2010 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2012-2016 Robin Gareus <robin@gareus.org>
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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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#ifdef WAF_BUILD
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#include "libardour-config.h"
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#endif
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#include <iostream>
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#include <cmath>
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#include <unistd.h>
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#include "ardour/timestamps.h"
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#include "pbd/error.h"
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#include "pbd/enumwriter.h"
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#include "pbd/stacktrace.h"
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#include "ardour/session.h"
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#include "ardour/tempo.h"
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#include "ardour/transport_fsm.h"
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#include "pbd/i18n.h"
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using namespace std;
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using namespace ARDOUR;
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using namespace PBD;
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#define TFSM_EVENT(evtype) { _transport_fsm->enqueue (new TransportFSM::Event (evtype)); }
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/* BBT TIME*/
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void
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Session::bbt_time (samplepos_t when, Timecode::BBT_Time& bbt)
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{
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bbt = _tempo_map->bbt_at_sample (when);
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}
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/* Timecode TIME */
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double
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Session::timecode_frames_per_second() const
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{
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return Timecode::timecode_to_frames_per_second (config.get_timecode_format());
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}
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bool
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Session::timecode_drop_frames() const
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{
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return Timecode::timecode_has_drop_frames(config.get_timecode_format());
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}
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void
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Session::sync_time_vars ()
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{
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_current_sample_rate = (samplecnt_t) round (_nominal_sample_rate * (1.0 + (config.get_video_pullup()/100.0)));
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_samples_per_timecode_frame = (double) _current_sample_rate / (double) timecode_frames_per_second();
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if (timecode_drop_frames()) {
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_frames_per_hour = (int32_t)(107892 * _samples_per_timecode_frame);
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} else {
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_frames_per_hour = (int32_t)(3600 * rint(timecode_frames_per_second()) * _samples_per_timecode_frame);
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}
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_timecode_frames_per_hour = rint(timecode_frames_per_second() * 3600.0);
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last_timecode_valid = false;
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// timecode type bits are the middle two in the upper nibble
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switch ((int) ceil (timecode_frames_per_second())) {
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case 24:
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mtc_timecode_bits = 0;
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break;
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case 25:
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mtc_timecode_bits = 0x20;
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break;
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case 30:
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default:
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if (timecode_drop_frames()) {
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mtc_timecode_bits = 0x40;
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} else {
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mtc_timecode_bits = 0x60;
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}
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break;
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};
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ltc_tx_parse_offset();
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}
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void
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Session::timecode_to_sample( Timecode::Time& timecode, samplepos_t& sample, bool use_offset, bool use_subframes ) const
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{
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timecode.rate = timecode_frames_per_second();
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Timecode::timecode_to_sample(
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timecode, sample, use_offset, use_subframes,
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_current_sample_rate,
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config.get_subframes_per_frame(),
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config.get_timecode_offset_negative(), config.get_timecode_offset()
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);
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}
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void
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Session::sample_to_timecode (samplepos_t sample, Timecode::Time& timecode, bool use_offset, bool use_subframes ) const
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{
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Timecode::sample_to_timecode (
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sample, timecode, use_offset, use_subframes,
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timecode_frames_per_second(),
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timecode_drop_frames(),
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double(_current_sample_rate),
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config.get_subframes_per_frame(),
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config.get_timecode_offset_negative(), config.get_timecode_offset()
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);
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}
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void
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Session::timecode_time (samplepos_t when, Timecode::Time& timecode)
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{
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if (last_timecode_valid && when == last_timecode_when) {
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timecode = last_timecode;
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return;
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}
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this->sample_to_timecode( when, timecode, true /* use_offset */, false /* use_subframes */ );
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last_timecode_when = when;
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last_timecode = timecode;
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last_timecode_valid = true;
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}
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void
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Session::timecode_time_subframes (samplepos_t when, Timecode::Time& timecode)
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{
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if (last_timecode_valid && when == last_timecode_when) {
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timecode = last_timecode;
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return;
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}
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this->sample_to_timecode( when, timecode, true /* use_offset */, true /* use_subframes */ );
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last_timecode_when = when;
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last_timecode = timecode;
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last_timecode_valid = true;
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}
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void
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Session::timecode_duration (samplecnt_t when, Timecode::Time& timecode) const
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{
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this->sample_to_timecode( when, timecode, false /* use_offset */, true /* use_subframes */ );
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}
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void
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Session::timecode_duration_string (char* buf, size_t len, samplepos_t when) const
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{
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Timecode::Time timecode;
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timecode_duration (when, timecode);
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snprintf (buf, len, "%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
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}
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void
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Session::timecode_time (Timecode::Time &t)
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{
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timecode_time (_transport_sample, t);
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}
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int
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Session::backend_sync_callback (TransportState state, samplepos_t pos)
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{
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bool slaved = synced_to_engine();
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int ready = true;
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// cerr << "SYNC state = " << enum_2_string (state) << endl;
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switch (state) {
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case TransportStopped:
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if (slaved && (_transport_sample != pos) && !locate_pending()) {
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/* we need to locate. This will be picked up in
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* Session::follow_transport_master and the locate will
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* be initiated there.
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*/
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// cerr << "SYNC: stopped, need locate to " << pos << " from " << _transport_sample << endl;
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ready = false;
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} else {
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// cerr << "SYNC: stopped, nothing to do" << endl;
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}
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break;
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case TransportStarting:
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if (slaved) {
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/* JACK is stopped (though starting). Our position
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* should be a buffer-size-rounded
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* worst_latency_preroll() ahead of JACK.
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*/
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const samplepos_t matching = pos + worst_latency_preroll_buffer_size_ceil ();
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ready = (_transport_sample == matching) && !locate_pending() && !declick_in_progress() && (remaining_latency_preroll() == 0);
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DEBUG_TRACE (DEBUG::Slave, string_compose ("JACK Transport: ts %1 = %2 lp = %3 dip = %4 rlp = %5 RES: %6\n", _transport_sample, pos, locate_pending(), declick_in_progress(), remaining_latency_preroll(), ready));
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} else {
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/* we're not participating, so just say we are in sync
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to stop interfering with other components of the engine
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transport (JACK) system.
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*/
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}
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break;
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case TransportRolling:
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break;
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default:
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error << string_compose (_("Unknown transport state %1 in sync callback"), state) << endmsg;
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}
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// cerr << "SYNC, ready ? " << ready << endl;
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return ready;
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}
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ARDOUR::samplecnt_t
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Session::convert_to_samples (AnyTime const & position)
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{
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double secs;
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switch (position.type) {
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case AnyTime::BBT:
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return _tempo_map->sample_at_bbt (position.bbt);
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break;
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case AnyTime::Timecode:
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/* XXX need to handle negative values */
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secs = position.timecode.hours * 60 * 60;
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secs += position.timecode.minutes * 60;
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secs += position.timecode.seconds;
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secs += position.timecode.frames / timecode_frames_per_second();
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if (config.get_timecode_offset_negative()) {
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return (samplecnt_t) floor (secs * sample_rate()) - config.get_timecode_offset();
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} else {
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return (samplecnt_t) floor (secs * sample_rate()) + config.get_timecode_offset();
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}
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break;
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case AnyTime::Seconds:
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return (samplecnt_t) floor (position.seconds * sample_rate());
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break;
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case AnyTime::Samples:
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return position.samples;
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break;
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}
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return position.samples;
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}
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ARDOUR::samplecnt_t
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Session::any_duration_to_samples (samplepos_t position, AnyTime const & duration)
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{
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double secs;
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switch (duration.type) {
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case AnyTime::BBT:
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return (samplecnt_t) ( _tempo_map->samplepos_plus_bbt (position, duration.bbt) - position);
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break;
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case AnyTime::Timecode:
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/* XXX need to handle negative values */
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secs = duration.timecode.hours * 60 * 60;
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secs += duration.timecode.minutes * 60;
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secs += duration.timecode.seconds;
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secs += duration.timecode.frames / timecode_frames_per_second();
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if (config.get_timecode_offset_negative()) {
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return (samplecnt_t) floor (secs * sample_rate()) - config.get_timecode_offset();
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} else {
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return (samplecnt_t) floor (secs * sample_rate()) + config.get_timecode_offset();
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}
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break;
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case AnyTime::Seconds:
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return (samplecnt_t) floor (duration.seconds * sample_rate());
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break;
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case AnyTime::Samples:
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return duration.samples;
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break;
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}
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return duration.samples;
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}
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