Port registration happens asynchronously. During the first process callbacks the timecode/clock input ports may not have been re-established.
661 lines
18 KiB
C++
661 lines
18 KiB
C++
/*
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* Copyright (C) 2012-2019 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2012-2019 Robin Gareus <robin@gareus.org>
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* Copyright (C) 2013-2018 John Emmas <john@creativepost.co.uk>
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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 <iostream>
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#include <errno.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 "ardour/debug.h"
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#include "ardour/profile.h"
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#include "ardour/transport_master.h"
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#include "ardour/session.h"
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#include "ardour/audioengine.h"
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#include "ardour/audio_port.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 MIDI;
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using namespace PBD;
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using namespace Timecode;
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#define ENGINE AudioEngine::instance()
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#define FLYWHEEL_TIMEOUT ( 1 * ENGINE->sample_rate() )
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/* XXX USE Config->get_ltc_input */
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LTC_TransportMaster::LTC_TransportMaster (std::string const & name)
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: TimecodeTransportMaster (name, LTC)
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, decoder (0)
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, samples_per_ltc_frame (0)
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, fps_detected (false)
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, monotonic_cnt (0)
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, frames_since_reset (0)
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, delayedlocked (10)
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, ltc_detect_fps_cnt (0)
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, ltc_detect_fps_max (0)
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, sync_lock_broken (false)
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, samples_per_timecode_frame (0)
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{
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memset (&prev_frame, 0, sizeof(LTCFrameExt));
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AudioEngine::instance()->Xrun.connect_same_thread (port_connection, boost::bind (<C_TransportMaster::resync_xrun, this));
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}
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void
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LTC_TransportMaster::init ()
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{
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reset (true);
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}
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void
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LTC_TransportMaster::create_port ()
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{
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if ((_port = AudioEngine::instance()->register_input_port (DataType::AUDIO, string_compose ("%1 in", _name), false, TransportMasterPort)) == 0) {
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throw failed_constructor();
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}
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}
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void
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LTC_TransportMaster::set_session (Session *s)
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{
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TransportMaster::set_session (s);
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session_connections.drop_connections();
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if (_session) {
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samples_per_ltc_frame = _session->samples_per_timecode_frame();
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timecode.drop = _session->timecode_drop_frames();
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if (decoder) {
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ltc_decoder_free (decoder);
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}
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decoder = ltc_decoder_create((int) samples_per_ltc_frame, 128 /*queue size*/);
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parse_timecode_offset();
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reset (true);
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_session->config.ParameterChanged.connect_same_thread (session_connections, boost::bind (<C_TransportMaster::parameter_changed, this, _1));
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_session->LatencyUpdated.connect_same_thread (session_connections, boost::bind (<C_TransportMaster::resync_latency, this, _1));
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}
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}
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LTC_TransportMaster::~LTC_TransportMaster()
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{
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port_connection.disconnect();
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session_connections.drop_connections();
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ltc_decoder_free(decoder);
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}
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void
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LTC_TransportMaster::connection_handler (boost::weak_ptr<ARDOUR::Port> w0, std::string n0, boost::weak_ptr<ARDOUR::Port> w1, std::string n1, bool con)
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{
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TransportMaster::connection_handler(w0, n0, w1, n1, con);
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boost::shared_ptr<Port> p = w1.lock ();
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if (p == _port) {
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resync_latency (false);
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}
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}
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void
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LTC_TransportMaster::parse_timecode_offset()
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{
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if (_session) {
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Timecode::Time offset_tc;
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Timecode::parse_timecode_format(_session->config.get_slave_timecode_offset(), offset_tc);
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offset_tc.rate = _session->timecode_frames_per_second();
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offset_tc.drop = _session->timecode_drop_frames();
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_session->timecode_to_sample(offset_tc, timecode_offset, false, false);
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timecode_negative_offset = offset_tc.negative;
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}
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}
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void
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LTC_TransportMaster::parameter_changed (std::string const & p)
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{
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if (p == "slave-timecode-offset"
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|| p == "timecode-format"
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) {
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parse_timecode_offset();
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}
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}
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ARDOUR::samplecnt_t
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LTC_TransportMaster::update_interval() const
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{
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if (timecode.rate) {
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return AudioEngine::instance()->sample_rate() / timecode.rate;
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}
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return AudioEngine::instance()->sample_rate(); /* useless but what other answer is there? */
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}
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ARDOUR::samplecnt_t
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LTC_TransportMaster::resolution () const
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{
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return (samplecnt_t) (ENGINE->sample_rate() / 1000);
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}
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bool
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LTC_TransportMaster::locked () const
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{
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DEBUG_TRACE (DEBUG::Slave, string_compose ("locked: fps ? %1 dlocked %2\n", fps_detected, delayedlocked));
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return fps_detected && (delayedlocked < 5);
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}
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bool
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LTC_TransportMaster::ok() const
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{
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return true;
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}
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void
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LTC_TransportMaster::resync_xrun()
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{
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DEBUG_TRACE (DEBUG::LTC, "LTC resync_xrun()\n");
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sync_lock_broken = false;
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}
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void
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LTC_TransportMaster::set_sample_clock_synced (bool yn)
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{
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sync_lock_broken = false;
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TransportMaster::set_sample_clock_synced (yn);
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}
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void
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LTC_TransportMaster::resync_latency (bool playback)
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{
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if (playback) {
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return;
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}
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uint32_t old = ltc_slave_latency.max;
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if (_port) {
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_port->get_connected_latency_range (ltc_slave_latency, false);
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC resync_latency: %1\n", ltc_slave_latency.max));
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}
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if (old != ltc_slave_latency.max) {
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sync_lock_broken = false;
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}
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}
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void
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LTC_TransportMaster::reset (bool with_position)
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{
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC reset() with pos ? %1\n", with_position));
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if (with_position) {
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current.update (current.position, 0, 0);
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_current_delta = 0;
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} else {
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current.reset ();
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}
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transport_direction = 0;
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sync_lock_broken = false;
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delayedlocked = 10;
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monotonic_cnt = 0;
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memset (&prev_frame, 0, sizeof(LTCFrameExt));
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frames_since_reset = 0;
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timecode_format_valid = false;
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}
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void
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LTC_TransportMaster::parse_ltc (const ARDOUR::pframes_t nframes, const Sample* const in, const ARDOUR::samplecnt_t posinfo)
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{
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pframes_t i;
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unsigned char sound[8192];
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if (nframes > 8192) {
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/* TODO warn once or wrap, loop conversion below
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* does jack/A3 support > 8192 spp anyway?
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*/
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return;
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}
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for (i = 0; i < nframes; i++) {
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const int snd=(int) rint ((127.0*in[i])+128.0);
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sound[i] = (unsigned char) (snd&0xff);
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}
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ltc_decoder_write (decoder, sound, nframes, posinfo);
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return;
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}
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bool
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LTC_TransportMaster::equal_ltc_sample_time(LTCFrame *a, LTCFrame *b) {
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if (a->frame_units != b->frame_units ||
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a->frame_tens != b->frame_tens ||
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a->dfbit != b->dfbit ||
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a->secs_units != b->secs_units ||
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a->secs_tens != b->secs_tens ||
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a->mins_units != b->mins_units ||
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a->mins_tens != b->mins_tens ||
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a->hours_units != b->hours_units ||
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a->hours_tens != b->hours_tens) {
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return false;
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}
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return true;
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}
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static ostream& operator<< (ostream& ostr, LTCFrame& a)
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{
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ostr
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<< a.hours_tens
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<< a.hours_units << ':'
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<< a.mins_tens
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<< a.mins_units << ':'
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<< a.secs_tens
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<< a.secs_units << ':'
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<< a.frame_tens
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<< a.frame_units
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<< (a.dfbit ? 'D' : ' ')
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;
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return ostr;
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}
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static ostream& operator<< (ostream& ostr, SMPTETimecode& t)
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{
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for (size_t i = 0; i < sizeof (t.timezone); ++i) {
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ostr << t.timezone[i];
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}
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ostr << ' '
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<< t.years << ' '
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<< t.months << ' '
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<< t.days << ' '
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<< t.hours << ' '
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<< t.mins << ' '
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<< t.secs << ' '
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<< t.frame
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;
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return ostr;
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}
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bool
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LTC_TransportMaster::detect_discontinuity(LTCFrameExt *sample, int fps, bool fuzzy)
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{
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bool discontinuity_detected = false;
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if (fuzzy && (
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( sample->reverse && prev_frame.ltc.frame_units == 0)
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||(!sample->reverse && sample->ltc.frame_units == 0)
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)) {
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memcpy(&prev_frame, sample, sizeof(LTCFrameExt));
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return false;
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}
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if (sample->reverse) {
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ltc_frame_decrement(&prev_frame.ltc, fps, LTC_TV_525_60, 0);
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} else {
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ltc_frame_increment(&prev_frame.ltc, fps, LTC_TV_525_60, 0);
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}
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if (!equal_ltc_sample_time(&prev_frame.ltc, &sample->ltc)) {
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discontinuity_detected = true;
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}
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memcpy (&prev_frame, sample, sizeof(LTCFrameExt));
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return discontinuity_detected;
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}
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bool
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LTC_TransportMaster::detect_ltc_fps(int frameno, bool df)
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{
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bool fps_changed = false;
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double detected_fps = 0;
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if (frameno > ltc_detect_fps_max) {
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ltc_detect_fps_max = frameno;
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}
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ltc_detect_fps_cnt++;
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if (ltc_detect_fps_cnt > 40) {
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if (ltc_detect_fps_cnt > ltc_detect_fps_max) {
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detected_fps = ltc_detect_fps_max + 1;
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if (df) {
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/* LTC df -> indicates fractional framerate */
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if (fr2997()) {
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detected_fps = detected_fps * 999.0 / 1000.0;
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} else {
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detected_fps = detected_fps * 1000.0 / 1001.0;
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}
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}
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timecode_format_valid = true; /* SET FLAG */
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if (timecode.rate != detected_fps || timecode.drop != df) {
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DEBUG_TRACE (DEBUG::LTC, string_compose ("detected FPS: %1%2\n", detected_fps, df?"df":"ndf"));
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} else {
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detected_fps = 0; /* no change */
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}
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}
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ltc_detect_fps_cnt = ltc_detect_fps_max = 0;
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}
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/* when changed */
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if (detected_fps != 0 && (detected_fps != timecode.rate || df != timecode.drop)) {
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timecode.rate = detected_fps;
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timecode.drop = df;
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samples_per_ltc_frame = double(ENGINE->sample_rate()) / timecode.rate;
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC reset to FPS: %1%2 ; audio-samples per LTC: %3\n",
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detected_fps, df?"df":"ndf", samples_per_ltc_frame));
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fps_changed=true;
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}
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TimecodeFormat tc_format = apparent_timecode_format();
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samples_per_timecode_frame = ENGINE->sample_rate() / Timecode::timecode_to_frames_per_second (tc_format);
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return fps_changed;
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}
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void
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LTC_TransportMaster::process_ltc(samplepos_t const now)
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{
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LTCFrameExt sample;
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LTC_TV_STANDARD tv_standard = LTC_TV_625_50;
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while (ltc_decoder_read (decoder, &sample)) {
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SMPTETimecode stime;
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ltc_frame_to_time (&stime, &sample.ltc, 0);
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timecode.negative = false;
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timecode.subframes = 0;
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/* set timecode.rate and timecode.drop: */
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const bool ltc_is_stationary = equal_ltc_sample_time (&prev_frame.ltc, &sample.ltc);
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if (detect_discontinuity (&sample, ceil(timecode.rate), !fps_detected)) {
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if (frames_since_reset > 1) {
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reset (false);
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}
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} else {
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if (fps_detected) {
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frames_since_reset++;
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DEBUG_TRACE (DEBUG::LTC, string_compose ("fsr %1\n", frames_since_reset));
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}
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}
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if (!ltc_is_stationary && detect_ltc_fps (stime.frame, (sample.ltc.dfbit) ? true : false)) {
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reset (true);
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fps_detected = true;
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}
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#ifndef NDEBUG
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if (DEBUG_ENABLED (DEBUG::LTC)) {
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/* use fprintf for simpler correct formatting of times
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*/
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char buf[256];
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snprintf (buf, sizeof (buf), "LTC@(%ld..%ld) rate %.3f %02d:%02d:%02d%c%02d | %8lld %8lld%s\n",
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now, now+ENGINE->samples_per_cycle(),
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timecode.rate,
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stime.hours,
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stime.mins,
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stime.secs,
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(sample.ltc.dfbit) ? '.' : ':',
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stime.frame,
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sample.off_start,
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sample.off_end,
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sample.reverse ? " R" : " "
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);
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DEBUG_TRACE (DEBUG::LTC, buf);
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}
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#endif
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/* when a full LTC sample is decoded, the timecode the LTC sample
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* is referring has just passed.
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* So we send the _next_ timecode which
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* is expected to start at the end of the current sample
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*/
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int fps_i = ceil(timecode.rate);
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switch(fps_i) {
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case 30:
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if (timecode.drop) {
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tv_standard = LTC_TV_525_60;
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} else {
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tv_standard = LTC_TV_1125_60;
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}
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break;
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case 25:
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tv_standard = LTC_TV_625_50;
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break;
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default:
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tv_standard = LTC_TV_FILM_24; /* == LTC_TV_1125_60 == no offset, 24,30fps BGF */
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break;
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}
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if (!sample.reverse) {
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ltc_frame_increment(&sample.ltc, fps_i, tv_standard, 0);
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ltc_frame_to_time(&stime, &sample.ltc, 0);
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transport_direction = 1;
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sample.off_start -= ltc_frame_alignment(samples_per_timecode_frame, tv_standard);
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sample.off_end -= ltc_frame_alignment(samples_per_timecode_frame, tv_standard);
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} else {
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ltc_frame_decrement(&sample.ltc, fps_i, tv_standard, 0);
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int off = sample.off_end - sample.off_start;
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sample.off_start += off - ltc_frame_alignment(samples_per_timecode_frame, tv_standard);
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sample.off_end += off - ltc_frame_alignment(samples_per_timecode_frame, tv_standard);
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transport_direction = -1;
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}
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timecode.hours = stime.hours;
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timecode.minutes = stime.mins;
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timecode.seconds = stime.secs;
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timecode.frames = stime.frame;
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samplepos_t ltc_sample; // audio-sample corresponding to position of LTC frame
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if (_session) {
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Timecode::timecode_to_sample (timecode, ltc_sample, true, false, (double)ENGINE->sample_rate(), _session->config.get_subframes_per_frame(), timecode_negative_offset, timecode_offset);
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} else {
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Timecode::timecode_to_sample (timecode, ltc_sample, true, false, (double)ENGINE->sample_rate(), 100, timecode_negative_offset, timecode_offset);
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}
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ltc_sample += ltc_slave_latency.max;
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/* This LTC frame spans sample time between sample.off_start .. sample.off_end
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*
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* NOTE: these sample times are NOT the ones that LTC is representing. They are
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* derived our own audioengine's monotonic audio clock.
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*
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* So we expect the next frame to span sample.off_end+1 and ... <don't care for now>.
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* That isn't the time we will necessarily receive the LTC frame, but the decoder
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* should tell us that its span begins there.
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*
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*/
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samplepos_t cur_timestamp = sample.off_end + 1;
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double ltc_speed = current.speed;
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC ltc-sample: %1 prev-ltc-sample %2 cur-timestamp: %3 last-timestamp: %4 frame-spans %5..%6\n", ltc_sample, current.position, cur_timestamp, current.timestamp, sample.off_start, sample.off_end));
|
|
|
|
if (cur_timestamp <= current.timestamp || current.timestamp == 0) {
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed: UNCHANGED: %1\n", current.speed));
|
|
} else {
|
|
ltc_speed = double (ltc_sample - current.position) / double (cur_timestamp - current.timestamp);
|
|
|
|
/* provide a .1% deadzone to lock the speed */
|
|
if (fabs (ltc_speed - 1.0) <= 0.001) {
|
|
ltc_speed = 1.0;
|
|
}
|
|
|
|
if (fabs (ltc_speed) > 10.0) {
|
|
ltc_speed = 0;
|
|
}
|
|
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed: %1 (moved %2 in %3\n", ltc_speed, (ltc_sample - current.position), (cur_timestamp - current.timestamp)));
|
|
}
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("update current to %1 %2 %3\n", ltc_sample, cur_timestamp, ltc_speed));
|
|
current.update (ltc_sample, cur_timestamp, ltc_speed);
|
|
|
|
} /* end foreach decoded LTC sample */
|
|
}
|
|
|
|
void
|
|
LTC_TransportMaster::pre_process (ARDOUR::pframes_t nframes, samplepos_t now, boost::optional<samplepos_t> session_pos)
|
|
{
|
|
if (!_port) {
|
|
reset (true);
|
|
return;
|
|
}
|
|
|
|
Sample* in = (Sample*) AudioEngine::instance()->port_engine().get_buffer (_port->port_handle(), nframes);
|
|
sampleoffset_t skip;
|
|
|
|
if (current.timestamp == 0 || frames_since_reset == 0) {
|
|
if (delayedlocked < 10) {
|
|
++delayedlocked;
|
|
}
|
|
|
|
monotonic_cnt = now;
|
|
skip = 0;
|
|
|
|
} else {
|
|
|
|
skip = now - (monotonic_cnt + nframes);
|
|
monotonic_cnt = now;
|
|
}
|
|
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("pre-process - TID:%1 | latency: %2 | skip %3 | session ? %4| last %5 | dir %6 | sp %7 | dl %8\n",
|
|
pthread_name(), ltc_slave_latency.max, skip, (_session ? 'y' : 'n'), current.timestamp, transport_direction, current.speed, delayedlocked));
|
|
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("pre-process with audio clock time: %1\n", now));
|
|
|
|
/* if the audioengine failed to take the process lock, it won't
|
|
call this method, and time will appear to skip. Reset the
|
|
LTC decoder's state by giving it some silence.
|
|
*/
|
|
|
|
if (skip > 0) {
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose("engine skipped %1 samples. Feeding silence to LTC parser.\n", skip));
|
|
if (skip >= 8192) skip = 8192;
|
|
unsigned char sound[8192];
|
|
memset (sound, 0x80, sizeof(char) * skip);
|
|
ltc_decoder_write (decoder, sound, skip, now);
|
|
reset (false);
|
|
} else if (skip != 0) {
|
|
/* this should never happen. it may if monotonic_cnt, now overflow on 64bit */
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose("engine skipped %1 samples\n", skip));
|
|
reset(true);
|
|
}
|
|
|
|
/* Now feed the incoming LTC signal into the decoder */
|
|
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("%1@%2 parse ltc @ %3 in %4\n", name(), this, now, nframes));
|
|
parse_ltc (nframes, in, now);
|
|
|
|
/* and pull out actual LTC frame data */
|
|
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("%1@%2 call process_ltc(%3)\n", name(), this, now));
|
|
process_ltc (now);
|
|
|
|
if (current.timestamp == 0) {
|
|
DEBUG_TRACE (DEBUG::LTC, "last timestamp == 0\n");
|
|
return;
|
|
} else if (current.speed != 0) {
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("speed non-zero (%1)\n", current.speed));
|
|
if (delayedlocked > 1) {
|
|
delayedlocked--;
|
|
} else if (_current_delta == 0) {
|
|
delayedlocked = 0;
|
|
}
|
|
}
|
|
|
|
if (abs (now - current.timestamp) > FLYWHEEL_TIMEOUT) {
|
|
DEBUG_TRACE (DEBUG::LTC, "flywheel timeout\n");
|
|
reset(true);
|
|
/* don't change position from last known */
|
|
|
|
return;
|
|
}
|
|
|
|
if (!sync_lock_broken && current.speed != 0 && delayedlocked == 0 && fabs(current.speed) != 1.0) {
|
|
sync_lock_broken = true;
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed not locked based on %1\n", current.speed));
|
|
}
|
|
|
|
if (session_pos) {
|
|
const samplepos_t current_pos = current.position + ((now - current.timestamp) * current.speed);
|
|
_current_delta = current_pos - *session_pos;
|
|
} else {
|
|
_current_delta = 0;
|
|
}
|
|
}
|
|
|
|
Timecode::TimecodeFormat
|
|
LTC_TransportMaster::apparent_timecode_format () const
|
|
{
|
|
if (timecode.rate == 24 && !timecode.drop)
|
|
return timecode_24;
|
|
else if (timecode.rate == 25 && !timecode.drop)
|
|
return timecode_25;
|
|
else if (rint(timecode.rate * 100) == 2997 && !timecode.drop)
|
|
return (fr2997() ? timecode_2997000 : timecode_2997);
|
|
else if (rint(timecode.rate * 100) == 2997 && timecode.drop)
|
|
return (fr2997() ? timecode_2997000drop : timecode_2997drop);
|
|
else if (timecode.rate == 30 && timecode.drop)
|
|
return timecode_2997drop; // timecode_30drop; // LTC counting to 30 samples w/DF *means* 29.97 df
|
|
else if (timecode.rate == 30 && !timecode.drop)
|
|
return timecode_30;
|
|
|
|
/* XXX - unknown timecode format */
|
|
|
|
if (_session) {
|
|
return _session->config.get_timecode_format();
|
|
} else {
|
|
return timecode_30;
|
|
}
|
|
}
|
|
|
|
std::string
|
|
LTC_TransportMaster::position_string() const
|
|
{
|
|
if (!_collect || current.timestamp == 0) {
|
|
return " --:--:--:--";
|
|
}
|
|
return Timecode::timecode_format_time(timecode);
|
|
}
|
|
|
|
std::string
|
|
LTC_TransportMaster::delta_string() const
|
|
{
|
|
if (!_collect || current.timestamp == 0) {
|
|
return X_("\u2012\u2012\u2012\u2012");
|
|
} else if ((monotonic_cnt - current.timestamp) > 2 * samples_per_ltc_frame) {
|
|
return _("flywheel");
|
|
} else {
|
|
return format_delta_time (_current_delta);
|
|
}
|
|
}
|