13
0
livetrax/libs/ardour/session_time.cc
Paul Davis ed67f465fb fix JACK transport sync
key change: to sync with JACK always locate jack-position PLUS buffer-sized-rounded-worst_latency_preroll() ahead
2019-12-27 21:18:12 -07:00

307 lines
8.2 KiB
C++

/*
* Copyright (C) 2005-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2006-2013 David Robillard <d@drobilla.net>
* Copyright (C) 2009-2010 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2012-2016 Robin Gareus <robin@gareus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef WAF_BUILD
#include "libardour-config.h"
#endif
#include <iostream>
#include <cmath>
#include <unistd.h>
#include "ardour/timestamps.h"
#include "pbd/error.h"
#include "pbd/enumwriter.h"
#include "pbd/stacktrace.h"
#include "ardour/session.h"
#include "ardour/tempo.h"
#include "ardour/transport_fsm.h"
#include "pbd/i18n.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
#define TFSM_EVENT(evtype) { _transport_fsm->enqueue (new TransportFSM::Event (evtype)); }
/* BBT TIME*/
void
Session::bbt_time (samplepos_t when, Timecode::BBT_Time& bbt)
{
bbt = _tempo_map->bbt_at_sample (when);
}
/* Timecode TIME */
double
Session::timecode_frames_per_second() const
{
return Timecode::timecode_to_frames_per_second (config.get_timecode_format());
}
bool
Session::timecode_drop_frames() const
{
return Timecode::timecode_has_drop_frames(config.get_timecode_format());
}
void
Session::sync_time_vars ()
{
_current_sample_rate = (samplecnt_t) round (_nominal_sample_rate * (1.0 + (config.get_video_pullup()/100.0)));
_samples_per_timecode_frame = (double) _current_sample_rate / (double) timecode_frames_per_second();
if (timecode_drop_frames()) {
_frames_per_hour = (int32_t)(107892 * _samples_per_timecode_frame);
} else {
_frames_per_hour = (int32_t)(3600 * rint(timecode_frames_per_second()) * _samples_per_timecode_frame);
}
_timecode_frames_per_hour = rint(timecode_frames_per_second() * 3600.0);
last_timecode_valid = false;
// timecode type bits are the middle two in the upper nibble
switch ((int) ceil (timecode_frames_per_second())) {
case 24:
mtc_timecode_bits = 0;
break;
case 25:
mtc_timecode_bits = 0x20;
break;
case 30:
default:
if (timecode_drop_frames()) {
mtc_timecode_bits = 0x40;
} else {
mtc_timecode_bits = 0x60;
}
break;
};
ltc_tx_parse_offset();
}
void
Session::timecode_to_sample( Timecode::Time& timecode, samplepos_t& sample, bool use_offset, bool use_subframes ) const
{
timecode.rate = timecode_frames_per_second();
Timecode::timecode_to_sample(
timecode, sample, use_offset, use_subframes,
_current_sample_rate,
config.get_subframes_per_frame(),
config.get_timecode_offset_negative(), config.get_timecode_offset()
);
}
void
Session::sample_to_timecode (samplepos_t sample, Timecode::Time& timecode, bool use_offset, bool use_subframes ) const
{
Timecode::sample_to_timecode (
sample, timecode, use_offset, use_subframes,
timecode_frames_per_second(),
timecode_drop_frames(),
double(_current_sample_rate),
config.get_subframes_per_frame(),
config.get_timecode_offset_negative(), config.get_timecode_offset()
);
}
void
Session::timecode_time (samplepos_t when, Timecode::Time& timecode)
{
if (last_timecode_valid && when == last_timecode_when) {
timecode = last_timecode;
return;
}
this->sample_to_timecode( when, timecode, true /* use_offset */, false /* use_subframes */ );
last_timecode_when = when;
last_timecode = timecode;
last_timecode_valid = true;
}
void
Session::timecode_time_subframes (samplepos_t when, Timecode::Time& timecode)
{
if (last_timecode_valid && when == last_timecode_when) {
timecode = last_timecode;
return;
}
this->sample_to_timecode( when, timecode, true /* use_offset */, true /* use_subframes */ );
last_timecode_when = when;
last_timecode = timecode;
last_timecode_valid = true;
}
void
Session::timecode_duration (samplecnt_t when, Timecode::Time& timecode) const
{
this->sample_to_timecode( when, timecode, false /* use_offset */, true /* use_subframes */ );
}
void
Session::timecode_duration_string (char* buf, size_t len, samplepos_t when) const
{
Timecode::Time timecode;
timecode_duration (when, timecode);
snprintf (buf, len, "%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
}
void
Session::timecode_time (Timecode::Time &t)
{
timecode_time (_transport_sample, t);
}
int
Session::backend_sync_callback (TransportState state, samplepos_t pos)
{
bool slaved = synced_to_engine();
int ready = true;
// cerr << "SYNC state = " << enum_2_string (state) << endl;
switch (state) {
case TransportStopped:
if (slaved && (_transport_sample != pos) && !locate_pending()) {
/* we need to locate. This will be picked up in
* Session::follow_transport_master and the locate will
* be initiated there.
*/
// cerr << "SYNC: stopped, need locate to " << pos << " from " << _transport_sample << endl;
ready = false;
} else {
// cerr << "SYNC: stopped, nothing to do" << endl;
}
break;
case TransportStarting:
if (slaved) {
/* JACK is stopped (though starting). Our position
* should be a buffer-size-rounded
* worst_latency_preroll() ahead of JACK.
*/
const samplepos_t matching = pos + worst_latency_preroll_buffer_size_ceil ();
ready = (_transport_sample == matching) && !locate_pending() && !declick_in_progress() && (remaining_latency_preroll() == 0);
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));
} else {
/* we're not participating, so just say we are in sync
to stop interfering with other components of the engine
transport (JACK) system.
*/
}
break;
case TransportRolling:
break;
default:
error << string_compose (_("Unknown transport state %1 in sync callback"), state) << endmsg;
}
// cerr << "SYNC, ready ? " << ready << endl;
return ready;
}
ARDOUR::samplecnt_t
Session::convert_to_samples (AnyTime const & position)
{
double secs;
switch (position.type) {
case AnyTime::BBT:
return _tempo_map->sample_at_bbt (position.bbt);
break;
case AnyTime::Timecode:
/* XXX need to handle negative values */
secs = position.timecode.hours * 60 * 60;
secs += position.timecode.minutes * 60;
secs += position.timecode.seconds;
secs += position.timecode.frames / timecode_frames_per_second();
if (config.get_timecode_offset_negative()) {
return (samplecnt_t) floor (secs * sample_rate()) - config.get_timecode_offset();
} else {
return (samplecnt_t) floor (secs * sample_rate()) + config.get_timecode_offset();
}
break;
case AnyTime::Seconds:
return (samplecnt_t) floor (position.seconds * sample_rate());
break;
case AnyTime::Samples:
return position.samples;
break;
}
return position.samples;
}
ARDOUR::samplecnt_t
Session::any_duration_to_samples (samplepos_t position, AnyTime const & duration)
{
double secs;
switch (duration.type) {
case AnyTime::BBT:
return (samplecnt_t) ( _tempo_map->samplepos_plus_bbt (position, duration.bbt) - position);
break;
case AnyTime::Timecode:
/* XXX need to handle negative values */
secs = duration.timecode.hours * 60 * 60;
secs += duration.timecode.minutes * 60;
secs += duration.timecode.seconds;
secs += duration.timecode.frames / timecode_frames_per_second();
if (config.get_timecode_offset_negative()) {
return (samplecnt_t) floor (secs * sample_rate()) - config.get_timecode_offset();
} else {
return (samplecnt_t) floor (secs * sample_rate()) + config.get_timecode_offset();
}
break;
case AnyTime::Seconds:
return (samplecnt_t) floor (duration.seconds * sample_rate());
break;
case AnyTime::Samples:
return duration.samples;
break;
}
return duration.samples;
}