fix and improve MTC-slave
- MTC-speed average (MIDI thread) * base timing on quarter-frames * replace hann-window average with a DLL - MTC/engine alignment * replace 1st order PI-controller with 2nd order DLL The 2nd DLL is needed because the jack-process callback effectively quantizes the transport-speed to integer audio-frames (speed * nframes). This leaves a delta on every cycle because the remainder from previous cycles is not compensated for. Theoretically it is possible to merge the two DLLs into one. However, with callbacks coming from by two independent threads it is cleaner to track the MTC and JACK engine-alignment speeds independently. git-svn-id: svn://localhost/ardour2/branches/3.0@13226 d708f5d6-7413-0410-9779-e7cbd77b26cf
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@ -32,8 +32,6 @@
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#include "midi++/parser.h"
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#include "midi++/types.h"
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class PIChaser;
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namespace MIDI {
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class Port;
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}
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@ -243,7 +241,6 @@ class MTC_Slave : public Slave {
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MIDI::Port* port;
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PBD::ScopedConnectionList port_connections;
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bool can_notify_on_unknown_rate;
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PIChaser* pic;
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static const int frame_tolerance;
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@ -253,18 +250,28 @@ class MTC_Slave : public Slave {
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MIDI::byte last_mtc_fps_byte;
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framepos_t window_begin;
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framepos_t window_end;
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framepos_t last_mtc_timestamp;
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framepos_t last_mtc_frame;
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framepos_t first_mtc_timestamp;
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bool did_reset_tc_format;
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TimecodeFormat saved_tc_format;
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size_t speed_accumulator_size;
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double* speed_accumulator;
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size_t speed_accumulator_cnt;
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bool have_first_speed_accumulator;
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double average_speed;
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Glib::Threads::Mutex reset_lock;
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uint32_t reset_pending;
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bool reset_position;
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int transport_direction;
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int busy_guard1;
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int busy_guard2;
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/* DLL - chase MTC */
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double t0; ///< time at the beginning of the MTC quater frame
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double t1; ///< calculated end of the MTC quater frame
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double e2; ///< second order loop error
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double b, c, omega; ///< DLL filter coefficients
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/* DLL - sync engine */
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int engine_dll_initstate;
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double te0; ///< time at the beginning of the engine process
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double te1; ///< calculated sync time
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double ee2; ///< second order loop error
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double be, ce, oe; ///< DLL filter coefficients
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void reset (bool with_pos);
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void queue_reset (bool with_pos);
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@ -276,7 +283,8 @@ class MTC_Slave : public Slave {
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void read_current (SafeTime *) const;
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void reset_window (framepos_t);
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bool outside_window (framepos_t) const;
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void process_apparent_speed (double);
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void init_mtc_dll(framepos_t, double);
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void init_engine_dll (framepos_t, framepos_t);
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};
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class MIDIClock_Slave : public Slave {
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@ -1,5 +1,6 @@
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/*
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Copyright (C) 2002-4 Paul Davis
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Overhaul 2012 Robin Gareus <robin@gareus.org>
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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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@ -45,7 +46,6 @@ using namespace PBD;
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recently received position (and without the direction of timecode reversing too), we
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will stop+locate+wait+chase.
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*/
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const int MTC_Slave::frame_tolerance = 2;
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MTC_Slave::MTC_Slave (Session& s, MIDI::Port& p)
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@ -55,36 +55,33 @@ MTC_Slave::MTC_Slave (Session& s, MIDI::Port& p)
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did_reset_tc_format = false;
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reset_pending = 0;
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reset_position = false;
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pic = new PIChaser();
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mtc_frame = 0;
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engine_dll_initstate = 0;
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busy_guard1 = busy_guard2 = 0;
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last_mtc_fps_byte = session.get_mtc_timecode_bits ();
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mtc_frame = 0;
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speed_accumulator_size = 16;
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speed_accumulator = new double[speed_accumulator_size];
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rebind (p);
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reset (true);
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rebind (p);
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}
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MTC_Slave::~MTC_Slave()
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{
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port_connections.drop_connections ();
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port_connections.drop_connections();
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while (busy_guard1 != busy_guard2) {
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/* make sure MIDI parser is not currently calling any callbacks in here,
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* else there's a segfault ahead!
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*
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* XXX this is called from jack rt-context :(
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* TODO fix libs/ardour/session_transport.cc:1321 (delete _slave;)
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*/
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sched_yield();
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}
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if (did_reset_tc_format) {
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session.config.set_timecode_format (saved_tc_format);
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}
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delete pic;
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delete [] speed_accumulator;
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}
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bool
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MTC_Slave::give_slave_full_control_over_transport_speed() const
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{
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return true; // for PiC control */
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// return false; // for Session-level computed varispeed
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}
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void
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@ -99,32 +96,189 @@ MTC_Slave::rebind (MIDI::Port& p)
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port->parser()->mtc_status.connect_same_thread (port_connections, boost::bind (&MTC_Slave::update_mtc_status, this, _1));
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}
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void
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MTC_Slave::update_mtc_qtr (Parser& /*p*/, int which_qtr, framepos_t now)
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bool
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MTC_Slave::give_slave_full_control_over_transport_speed() const
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{
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DEBUG_TRACE (DEBUG::MTC, string_compose ("qtr frame %1 at %2\n", which_qtr, now));
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maybe_reset ();
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last_inbound_frame = now;
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return true; // DLL align to engine transport
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// return false; // for Session-level computed varispeed
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}
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ARDOUR::framecnt_t
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MTC_Slave::resolution () const
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{
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return (framecnt_t) session.frames_per_timecode_frame();
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}
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ARDOUR::framecnt_t
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MTC_Slave::seekahead_distance () const
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{
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return session.frames_per_timecode_frame() * 2 * transport_direction;
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}
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bool
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MTC_Slave::outside_window (framepos_t pos) const
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{
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return ((pos < window_begin) || (pos > window_end));
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}
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bool
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MTC_Slave::locked () const
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{
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return port->parser()->mtc_locked();
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}
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bool
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MTC_Slave::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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MTC_Slave::queue_reset (bool reset_pos)
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{
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Glib::Threads::Mutex::Lock lm (reset_lock);
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reset_pending++;
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if (reset_pos) {
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reset_position = true;
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}
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}
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void
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MTC_Slave::maybe_reset ()
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{
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Glib::Threads::Mutex::Lock lm (reset_lock);
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if (reset_pending) {
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reset (reset_position);
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reset_pending = 0;
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reset_position = false;
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}
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}
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void
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MTC_Slave::reset (bool with_position)
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{
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DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC_Slave reset %1\n", with_position?"with position":"without position"));
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if (with_position) {
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last_inbound_frame = 0;
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current.guard1++;
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current.position = 0;
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current.timestamp = 0;
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current.speed = 0;
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current.guard2++;
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} else {
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last_inbound_frame = 0;
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current.guard1++;
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current.timestamp = 0;
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current.speed = 0;
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current.guard2++;
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}
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first_mtc_timestamp = 0;
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window_begin = 0;
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window_end = 0;
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transport_direction = 1;
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}
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void
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MTC_Slave::handle_locate (const MIDI::byte* mmc_tc)
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{
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MIDI::byte mtc[5];
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DEBUG_TRACE (DEBUG::MTC, "MTC_Slave::handle_locate\n");
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mtc[4] = last_mtc_fps_byte;
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mtc[3] = mmc_tc[0] & 0xf; /* hrs only */
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mtc[2] = mmc_tc[1];
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mtc[1] = mmc_tc[2];
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mtc[0] = mmc_tc[3];
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update_mtc_time (mtc, true, 0);
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}
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void
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MTC_Slave::read_current (SafeTime *st) const
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{
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int tries = 0;
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do {
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if (tries == 10) {
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error << _("MTC Slave: atomic read of current time failed, sleeping!") << endmsg;
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usleep (20);
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tries = 0;
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}
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*st = current;
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tries++;
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} while (st->guard1 != st->guard2);
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}
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void
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MTC_Slave::init_mtc_dll(framepos_t mtc_frame, double qtr)
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{
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omega = 2.0 * M_PI * (session.frames_per_timecode_frame() / 4.0) / double(session.frame_rate());
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b = 1.4142135623730950488 * omega;
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c = omega * omega;
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e2 = qtr;
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t0 = double(mtc_frame);
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t1 = t0 + e2;
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DEBUG_TRACE (DEBUG::MTC, string_compose ("[re-]init MTC DLL %1 %2 %3\n", t0, t1, e2));
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}
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/* called from MIDI parser */
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void
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MTC_Slave::update_mtc_qtr (Parser& /*p*/, int which_qtr, framepos_t now)
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{
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busy_guard1++;
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const framepos_t qtr = (session.frames_per_timecode_frame() / 4);
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const double qtr_d = (session.frames_per_timecode_frame() / 4.0);
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mtc_frame += qtr * transport_direction;
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DEBUG_TRACE (DEBUG::MTC, string_compose ("qtr frame %1 at %2 -> mtc_frame: %3\n", which_qtr, now, mtc_frame));
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double mtc_speed = 0;
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if (first_mtc_timestamp != 0) {
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/* update MTC DLL and calculate speed */
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const double e = double(transport_direction) * (double(now) - double(current.timestamp) - qtr_d);
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t0 = t1;
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t1 += b * e + e2;
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e2 += c * e;
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mtc_speed = (t1 - t0) / qtr_d;
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DEBUG_TRACE (DEBUG::MTC, string_compose ("qtr frame DLL t0:%1 t1:%2 err:%3 spd:%4\n", t0, t1, e, mtc_speed));
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}
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current.guard1++;
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current.position = mtc_frame;
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current.timestamp = now;
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current.speed = mtc_speed;
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current.guard2++;
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maybe_reset ();
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last_inbound_frame = now;
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busy_guard2++;
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}
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/* called from MIDI parser _after_ update_mtc_qtr()
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* when a full TC has been received
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* OR on locate */
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void
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MTC_Slave::update_mtc_time (const byte *msg, bool was_full, framepos_t now)
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{
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busy_guard1++;
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/* "now" can be zero if this is called from a context where we do not have or do not want
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to use a timestamp indicating when this MTC time was received. example: when we received
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a locate command via MMC.
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*/
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if (now) {
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maybe_reset ();
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}
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//DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC::update_mtc_time - TID:%1\n", ::pthread_self()));
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Timecode::Time timecode;
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TimecodeFormat tc_format;
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bool reset_tc = true;
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framepos_t window_root = -1;
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DEBUG_TRACE (DEBUG::MTC, string_compose ("full mtc time known at %1, full ? %2\n", now, was_full));
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timecode.hours = msg[3];
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timecode.minutes = msg[2];
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@ -133,6 +287,12 @@ MTC_Slave::update_mtc_time (const byte *msg, bool was_full, framepos_t now)
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last_mtc_fps_byte = msg[4];
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DEBUG_TRACE (DEBUG::MTC, string_compose ("full mtc time known at %1, full ? %2\n", now, was_full));
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if (now) {
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maybe_reset ();
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}
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switch (msg[4]) {
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case MTC_24_FPS:
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timecode.rate = 24;
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@ -179,12 +339,12 @@ MTC_Slave::update_mtc_time (const byte *msg, bool was_full, framepos_t now)
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session.config.set_timecode_format (tc_format);
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}
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DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC time timestamp = %1 TC %2 = frame %3 (from full message ? %4)\n",
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DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC at %1 TC %2 = mtc_frame %3 (from full message ? %4)\n",
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now, timecode, mtc_frame, was_full));
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if (was_full || outside_window (mtc_frame)) {
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session.timecode_to_sample (timecode, mtc_frame, true, false);
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DEBUG_TRACE (DEBUG::MTC, string_compose ("update_mtc_time: full TC or outside window. - TID:%1\n", ::pthread_self()));
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session.timecode_to_sample (timecode, mtc_frame, true, false); // sets mtc_frame
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session.request_locate (mtc_frame, false);
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session.request_transport_speed (0);
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update_mtc_status (MIDI::MTC_Stopped);
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@ -203,7 +363,7 @@ MTC_Slave::update_mtc_time (const byte *msg, bool was_full, framepos_t now)
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consideration.
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*/
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session.timecode_to_sample (timecode, mtc_frame, true, false);
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session.timecode_to_sample (timecode, mtc_frame, true, false); // sets mtc_frame
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/* We received the last quarter frame 7 quarter frames (1.75 mtc
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frames) after the instance when the contents of the mtc quarter
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@ -211,125 +371,54 @@ MTC_Slave::update_mtc_time (const byte *msg, bool was_full, framepos_t now)
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frames. Also compensate for audio latency.
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*/
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mtc_frame += (long) (1.75 * session.frames_per_timecode_frame()) + session.worst_playback_latency();
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DEBUG_TRACE (DEBUG::MTC, string_compose ("new mtc_frame = %1 | %2 FPTC | LAT: %3\n",
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mtc_frame, session.frames_per_timecode_frame(), session.worst_playback_latency()));
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long int mtc_off = (long) (1.75 * session.frames_per_timecode_frame()) + session.worst_playback_latency();
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double qtr = (session.frames_per_timecode_frame() / 4.0);
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switch (port->parser()->mtc_running()) {
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case MTC_Backward:
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mtc_frame -= mtc_off;
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qtr *= -1.0;
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break;
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case MTC_Forward:
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mtc_frame += mtc_off;
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break;
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default:
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break;
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}
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DEBUG_TRACE (DEBUG::MTC, string_compose ("new mtc_frame (w/latency comp) = %1\n", mtc_frame));
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if (now) {
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if (last_mtc_timestamp == 0) {
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last_mtc_timestamp = now;
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last_mtc_frame = mtc_frame;
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} else {
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if (give_slave_full_control_over_transport_speed()) {
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/* PIC
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*
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* its not the average, but we will assign it to current.speed below
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*/
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static framepos_t last_seen_timestamp = 0;
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static framepos_t last_seen_position = 0;
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if ((now - last_seen_timestamp) < 300) {
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mtc_frame = (mtc_frame + last_seen_position)/2;
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if (first_mtc_timestamp == 0 || current.timestamp == 0) {
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first_mtc_timestamp = now;
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init_mtc_dll(mtc_frame, qtr);
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}
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last_seen_timestamp = now;
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last_seen_position = mtc_frame;
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} else {
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/* Non-PiC
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*/
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framepos_t time_delta = (now - last_mtc_timestamp);
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if (time_delta != 0) {
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double apparent_speed = (mtc_frame - last_mtc_frame) / (double) (time_delta);
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process_apparent_speed (apparent_speed);
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DEBUG_TRACE (DEBUG::Slave, string_compose ("apparent speed was %1 average is now %2\n", apparent_speed, average_speed));
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} else {
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DEBUG_TRACE (DEBUG::Slave, string_compose ("no apparent calc, average is %1\n", average_speed));
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}
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/* every second, recalibrate the starting point for the speed measurement */
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if (mtc_frame - last_mtc_frame > session.frame_rate()) {
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last_mtc_timestamp = now;
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last_mtc_frame = mtc_frame;
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}
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}
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}
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current.guard1++;
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current.position = mtc_frame;
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current.timestamp = now;
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current.speed = average_speed;
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current.guard2++;
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window_root = mtc_frame;
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reset_window (mtc_frame);
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}
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}
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if (now) {
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last_inbound_frame = now;
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}
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|
||||
if (window_root >= 0) {
|
||||
reset_window (window_root);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::process_apparent_speed (double this_speed)
|
||||
{
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("speed cnt %1 sz %2 have %3\n", speed_accumulator_cnt, speed_accumulator_size, have_first_speed_accumulator));
|
||||
|
||||
/* clamp to an expected range */
|
||||
|
||||
if (this_speed > 4.0 || this_speed < -4.0) {
|
||||
this_speed = average_speed;
|
||||
}
|
||||
|
||||
if (speed_accumulator_cnt >= speed_accumulator_size) {
|
||||
have_first_speed_accumulator = true;
|
||||
speed_accumulator_cnt = 0;
|
||||
}
|
||||
|
||||
speed_accumulator[speed_accumulator_cnt++] = this_speed;
|
||||
|
||||
if (have_first_speed_accumulator) {
|
||||
average_speed = 0.0;
|
||||
for (size_t i = 0; i < speed_accumulator_size; ++i) {
|
||||
average_speed += speed_accumulator[i];
|
||||
}
|
||||
average_speed /= speed_accumulator_size;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::handle_locate (const MIDI::byte* mmc_tc)
|
||||
{
|
||||
MIDI::byte mtc[5];
|
||||
|
||||
mtc[4] = last_mtc_fps_byte;
|
||||
mtc[3] = mmc_tc[0] & 0xf; /* hrs only */
|
||||
mtc[2] = mmc_tc[1];
|
||||
mtc[1] = mmc_tc[2];
|
||||
mtc[0] = mmc_tc[3];
|
||||
|
||||
update_mtc_time (mtc, true, 0);
|
||||
busy_guard2++;
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::update_mtc_status (MIDI::MTC_Status status)
|
||||
{
|
||||
/* XXX !!! thread safety ... called from MIDI I/O context
|
||||
and process() context (via ::speed_and_position())
|
||||
* on locate (via ::update_mtc_time())
|
||||
*/
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose("MTC_Slave::update_mtc_status - TID:%1\n", ::pthread_self()));
|
||||
return; // why was this fn needed anyway ? it just messes up things -> use reset.
|
||||
busy_guard1++;
|
||||
|
||||
switch (status) {
|
||||
case MTC_Stopped:
|
||||
@ -357,186 +446,12 @@ MTC_Slave::update_mtc_status (MIDI::MTC_Status status)
|
||||
current.guard2++;
|
||||
break;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::read_current (SafeTime *st) const
|
||||
{
|
||||
int tries = 0;
|
||||
|
||||
do {
|
||||
if (tries == 10) {
|
||||
error << _("MTC Slave: atomic read of current time failed, sleeping!") << endmsg;
|
||||
usleep (20);
|
||||
tries = 0;
|
||||
}
|
||||
*st = current;
|
||||
tries++;
|
||||
|
||||
} while (st->guard1 != st->guard2);
|
||||
}
|
||||
|
||||
bool
|
||||
MTC_Slave::locked () const
|
||||
{
|
||||
return port->parser()->mtc_locked();
|
||||
}
|
||||
|
||||
bool
|
||||
MTC_Slave::ok() const
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
bool
|
||||
MTC_Slave::speed_and_position (double& speed, framepos_t& pos)
|
||||
{
|
||||
framepos_t now = session.engine().frame_time();
|
||||
SafeTime last;
|
||||
framecnt_t elapsed;
|
||||
bool in_control = false;
|
||||
|
||||
read_current (&last);
|
||||
|
||||
if (last.timestamp == 0) {
|
||||
speed = 0;
|
||||
pos = last.position;
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("first call to MTC_Slave::speed_and_position, pos = %1\n", last.position));
|
||||
return true;
|
||||
}
|
||||
|
||||
/* no timecode for 1/4 second ? conclude that its stopped */
|
||||
|
||||
if (last_inbound_frame && now > last_inbound_frame && now - last_inbound_frame > session.frame_rate() / 4) {
|
||||
speed = 0;
|
||||
pos = last.position;
|
||||
session.request_locate (pos, false);
|
||||
session.request_transport_speed (0);
|
||||
queue_reset (false);
|
||||
DEBUG_TRACE (DEBUG::MTC, "MTC not seen for 1/4 second - reset pending\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC::speed_and_position %1 %2\n", last.speed, last.position));
|
||||
|
||||
if (give_slave_full_control_over_transport_speed()) {
|
||||
in_control = (session.slave_state() == Session::Running);
|
||||
framepos_t pic_want_locate = 0;
|
||||
//framepos_t slave_pos = session.audible_frame();
|
||||
framepos_t slave_pos = session.transport_frame();
|
||||
static double average_speed = 0;
|
||||
|
||||
framepos_t ref_now = session.engine().frame_time_at_cycle_start();
|
||||
average_speed = pic->get_ratio (last.timestamp, last.position, ref_now, slave_pos, in_control, session.engine().frames_per_cycle());
|
||||
|
||||
pic_want_locate = pic->want_locate();
|
||||
|
||||
if (in_control && pic_want_locate) {
|
||||
last.speed = average_speed + (double) (pic_want_locate - session.transport_frame()) / (double)session.get_block_size();
|
||||
std::cout << "locate req " << pic_want_locate << " speed: " << average_speed << "\n";
|
||||
} else {
|
||||
last.speed = average_speed;
|
||||
}
|
||||
}
|
||||
|
||||
if (last.speed == 0.0f) {
|
||||
|
||||
elapsed = 0;
|
||||
|
||||
} else {
|
||||
|
||||
/* scale elapsed time by the current MTC speed */
|
||||
|
||||
if (last.timestamp && (now > last.timestamp)) {
|
||||
elapsed = (framecnt_t) floor (last.speed * (now - last.timestamp));
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("last timecode received @ %1, now = %2, elapsed frames = %3 w/speed= %4\n",
|
||||
last.timestamp, now, elapsed, last.speed));
|
||||
} else {
|
||||
elapsed = 0; /* XXX is this right? */
|
||||
}
|
||||
}
|
||||
|
||||
/* now add the most recent timecode value plus the estimated elapsed interval */
|
||||
|
||||
if (in_control) {
|
||||
pos = session.transport_frame();
|
||||
} else {
|
||||
pos = last.position + elapsed;
|
||||
}
|
||||
|
||||
speed = last.speed;
|
||||
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC::speed_and_position FINAL %1 %2\n", last.speed, pos));
|
||||
|
||||
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("last = %1 elapsed = %2 pos = %3 speed = %4\n", last.position, elapsed, pos, speed));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
ARDOUR::framecnt_t
|
||||
MTC_Slave::resolution () const
|
||||
{
|
||||
return (framecnt_t) session.frames_per_timecode_frame();
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::queue_reset (bool reset_pos)
|
||||
{
|
||||
Glib::Threads::Mutex::Lock lm (reset_lock);
|
||||
reset_pending++;
|
||||
if (reset_pos) {
|
||||
reset_position = true;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::maybe_reset ()
|
||||
{
|
||||
Glib::Threads::Mutex::Lock lm (reset_lock);
|
||||
|
||||
if (reset_pending) {
|
||||
reset (reset_position);
|
||||
reset_pending = 0;
|
||||
reset_position = false;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::reset (bool with_position)
|
||||
{
|
||||
if (with_position) {
|
||||
last_inbound_frame = 0;
|
||||
current.guard1++;
|
||||
current.position = 0;
|
||||
current.timestamp = 0;
|
||||
current.speed = 0;
|
||||
current.guard2++;
|
||||
} else {
|
||||
last_inbound_frame = 0;
|
||||
current.guard1++;
|
||||
current.timestamp = 0;
|
||||
current.speed = 0;
|
||||
current.guard2++;
|
||||
}
|
||||
|
||||
window_begin = 0;
|
||||
window_end = 0;
|
||||
last_mtc_frame = 0;
|
||||
last_mtc_timestamp = 0;
|
||||
|
||||
average_speed = 0;
|
||||
have_first_speed_accumulator = false;
|
||||
speed_accumulator_cnt = 0;
|
||||
|
||||
pic->reset();
|
||||
busy_guard2++;
|
||||
}
|
||||
|
||||
void
|
||||
MTC_Slave::reset_window (framepos_t root)
|
||||
{
|
||||
|
||||
/* if we're waiting for the master to catch us after seeking ahead, keep the window
|
||||
of acceptable MTC frames wide open. otherwise, shrink it down to just 2 video frames
|
||||
ahead of the window root (taking direction into account).
|
||||
@ -545,14 +460,16 @@ MTC_Slave::reset_window (framepos_t root)
|
||||
switch (port->parser()->mtc_running()) {
|
||||
case MTC_Forward:
|
||||
window_begin = root;
|
||||
transport_direction = 1;
|
||||
if (session.slave_state() == Session::Running) {
|
||||
window_end = root + (session.frames_per_timecode_frame() * frame_tolerance);
|
||||
} else {
|
||||
window_end = root + seekahead_distance ();
|
||||
window_end = root + labs(seekahead_distance ());
|
||||
}
|
||||
break;
|
||||
|
||||
case MTC_Backward:
|
||||
transport_direction = -1;
|
||||
if (session.slave_state() == Session::Running) {
|
||||
framecnt_t const d = session.frames_per_timecode_frame() * frame_tolerance;
|
||||
if (root > d) {
|
||||
@ -562,7 +479,7 @@ MTC_Slave::reset_window (framepos_t root)
|
||||
window_begin = 0;
|
||||
}
|
||||
} else {
|
||||
framecnt_t const d = seekahead_distance ();
|
||||
framecnt_t const d = labs(seekahead_distance ());
|
||||
if (root > d) {
|
||||
window_begin = root - d;
|
||||
} else {
|
||||
@ -580,15 +497,110 @@ MTC_Slave::reset_window (framepos_t root)
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("legal MTC window now %1 .. %2\n", window_begin, window_end));
|
||||
}
|
||||
|
||||
ARDOUR::framecnt_t
|
||||
MTC_Slave::seekahead_distance () const
|
||||
void
|
||||
MTC_Slave::init_engine_dll (framepos_t pos, framepos_t inc)
|
||||
{
|
||||
/* 1 second */
|
||||
return session.frame_rate();
|
||||
/* the bandwidth of the DLL is a trade-off,
|
||||
* because the max-speed of the transport in ardour is
|
||||
* limited to +-8.0, a larger bandwidth would cause oscillations
|
||||
*
|
||||
* But this is only really a problem if the user performs manual
|
||||
* seeks while transport is running and slaved to MTC.
|
||||
*/
|
||||
oe = 2.0 * M_PI * double(inc/6.0) / double(session.frame_rate());
|
||||
be = 1.4142135623730950488 * oe;
|
||||
ce = oe * oe;
|
||||
|
||||
ee2 = double(transport_direction * inc);
|
||||
te0 = double(pos);
|
||||
te1 = te0 + ee2;
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("[re-]init Engine DLL %1 %2 %3\n", te0, te1, ee2));
|
||||
}
|
||||
|
||||
/* main entry point from session_process.cc
|
||||
* in jack_process callback context */
|
||||
bool
|
||||
MTC_Slave::outside_window (framepos_t pos) const
|
||||
MTC_Slave::speed_and_position (double& speed, framepos_t& pos)
|
||||
{
|
||||
return ((pos < window_begin) || (pos > window_end));
|
||||
framepos_t now = session.engine().frame_time_at_cycle_start();
|
||||
framepos_t sess_pos = session.transport_frame(); // corresponds to now
|
||||
|
||||
SafeTime last;
|
||||
framecnt_t elapsed;
|
||||
|
||||
read_current (&last);
|
||||
|
||||
/* re-init engine DLL here when state changed (direction, first_mtc_timestamp) */
|
||||
if (last.timestamp == 0) { engine_dll_initstate = 0; }
|
||||
else if (engine_dll_initstate != transport_direction) {
|
||||
engine_dll_initstate = transport_direction;
|
||||
init_engine_dll(last.position, session.engine().frames_per_cycle());
|
||||
}
|
||||
|
||||
if (last.timestamp == 0) {
|
||||
speed = 0;
|
||||
pos = last.position;
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("first call to MTC_Slave::speed_and_position, pos = %1\n", last.position));
|
||||
return true;
|
||||
}
|
||||
|
||||
/* no timecode for two frames - conclude that it's stopped */
|
||||
if (last_inbound_frame && now > last_inbound_frame && now - last_inbound_frame > labs(seekahead_distance())) {
|
||||
speed = 0;
|
||||
pos = last.position;
|
||||
session.request_locate (pos, false);
|
||||
session.request_transport_speed (0);
|
||||
queue_reset (false);
|
||||
DEBUG_TRACE (DEBUG::MTC, "MTC not seen for 2 frames - reset pending\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
|
||||
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC::speed_and_position mtc-tme: %1 mtc-pos: %2\n", last.timestamp, last.position));
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("MTC::speed_and_position eng-tme: %1 eng-pos: %2\n", now, sess_pos));
|
||||
|
||||
double speed_flt = last.speed; ///< MTC speed from MTC-quarter-frame DLL
|
||||
|
||||
/* interpolate position according to speed and time since last quarter-frame*/
|
||||
if (speed_flt == 0.0f) {
|
||||
elapsed = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* scale elapsed time by the current MTC speed */
|
||||
if (last.timestamp && (now > last.timestamp)) {
|
||||
elapsed = (framecnt_t) rint (speed_flt * (now - last.timestamp));
|
||||
} else {
|
||||
elapsed = 0;
|
||||
}
|
||||
if (give_slave_full_control_over_transport_speed()) {
|
||||
/* there is a frame-delta engine vs MTC position
|
||||
* mostly due to quantization and rounding of (speed * nframes)
|
||||
* thus we use an other DLL..
|
||||
*/
|
||||
|
||||
/* update engine DLL and calculate speed */
|
||||
const double e = double (last.position + elapsed - sess_pos);
|
||||
te0 = te1;
|
||||
te1 += be * e + ee2;
|
||||
ee2 += ce * e;
|
||||
speed_flt = (te1 - te0) / double(session.engine().frames_per_cycle());
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("engine DLL t0:%1 t1:%2 err:%3 spd:%4\n", te0, te1, e, speed_flt));
|
||||
}
|
||||
}
|
||||
|
||||
pos = last.position + elapsed;
|
||||
speed = speed_flt;
|
||||
|
||||
/* may happen if the user performs a seek in the timeline while slaved to running MTC
|
||||
* engine-DLL can oscillate back before 0.
|
||||
* also see note in MTC_Slave::init_engine_dll
|
||||
*/
|
||||
if (pos <0) queue_reset(true);
|
||||
|
||||
DEBUG_TRACE (DEBUG::MTC, string_compose ("MTCsync spd: %1 pos: %2 | last-pos: %3 elapsed: %4 delta: %5\n",
|
||||
speed, pos, last.position, elapsed, pos - sess_pos));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user