617 lines
18 KiB
C++
617 lines
18 KiB
C++
/*
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Copyright (C) 2012 Paul Davis
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Witten by 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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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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/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/slave.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 "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 FLYWHEEL_TIMEOUT ( 1 * session.frame_rate() )
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LTC_Slave::LTC_Slave (Session& s)
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: session (s)
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{
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frames_per_ltc_frame = session.frames_per_timecode_frame();
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timecode.rate = session.timecode_frames_per_second();
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timecode.drop = session.timecode_drop_frames();
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did_reset_tc_format = false;
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delayedlocked = 10;
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monotonic_cnt = 0;
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fps_detected=false;
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sync_lock_broken = false;
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ltc_timecode = session.config.get_timecode_format();
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a3e_timecode = session.config.get_timecode_format();
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printed_timecode_warning = false;
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ltc_detect_fps_cnt = ltc_detect_fps_max = 0;
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memset(&prev_frame, 0, sizeof(LTCFrameExt));
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decoder = ltc_decoder_create((int) frames_per_ltc_frame, 128 /*queue size*/);
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session.config.ParameterChanged.connect_same_thread (config_connection, boost::bind (<C_Slave::parameter_changed, this, _1));
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parse_timecode_offset();
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reset();
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resync_latency();
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session.Xrun.connect_same_thread (port_connections, boost::bind (<C_Slave::resync_xrun, this));
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session.engine().GraphReordered.connect_same_thread (port_connections, boost::bind (<C_Slave::resync_latency, this));
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}
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LTC_Slave::~LTC_Slave()
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{
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port_connections.drop_connections();
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config_connection.disconnect();
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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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ltc_decoder_free(decoder);
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}
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void
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LTC_Slave::parse_timecode_offset() {
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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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void
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LTC_Slave::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::framecnt_t
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LTC_Slave::resolution () const
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{
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return (framecnt_t) (session.frame_rate() / 1000);
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}
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bool
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LTC_Slave::locked () const
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{
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return (delayedlocked < 5);
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}
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bool
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LTC_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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LTC_Slave::resync_xrun()
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{
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DEBUG_TRACE (DEBUG::LTC, "LTC resync_xrun()\n");
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engine_dll_initstate = 0;
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sync_lock_broken = false;
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}
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void
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LTC_Slave::resync_latency()
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{
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DEBUG_TRACE (DEBUG::LTC, "LTC resync_latency()\n");
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engine_dll_initstate = 0;
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sync_lock_broken = false;
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if (!session.deletion_in_progress() && session.ltc_output_io()) { /* check if Port exits */
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boost::shared_ptr<Port> ltcport = session.ltc_input_port();
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ltcport->get_connected_latency_range (ltc_slave_latency, false);
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}
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}
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void
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LTC_Slave::reset()
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{
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DEBUG_TRACE (DEBUG::LTC, "LTC reset()\n");
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last_timestamp = 0;
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current_delta = 0;
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transport_direction = 0;
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ltc_speed = 0;
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engine_dll_initstate = 0;
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sync_lock_broken = false;
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ActiveChanged (false); /* EMIT SIGNAL */
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}
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void
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LTC_Slave::parse_ltc(const ARDOUR::pframes_t nframes, const Sample* const in, const ARDOUR::framecnt_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_Slave::equal_ltc_frame_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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) {
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return false;
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}
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return true;
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}
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bool
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LTC_Slave::detect_discontinuity(LTCFrameExt *frame, int fps, bool fuzzy) {
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bool discontinuity_detected = false;
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if (fuzzy && (
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( frame->reverse && prev_frame.ltc.frame_units == 0)
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||(!frame->reverse && frame->ltc.frame_units == 0)
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)) {
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memcpy(&prev_frame, frame, sizeof(LTCFrameExt));
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return false;
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}
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if (frame->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_frame_time(&prev_frame.ltc, &frame->ltc)) {
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discontinuity_detected = true;
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}
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memcpy(&prev_frame, frame, sizeof(LTCFrameExt));
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return discontinuity_detected;
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}
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bool
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LTC_Slave::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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{
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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 (Config->get_timecode_source_2997()) {
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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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if (timecode.rate != detected_fps || timecode.drop != df) {
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC detected FPS: %1%2\n", detected_fps, df?"df":"ndf"));
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} else {
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detected_fps = 0; /* no cange */
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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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frames_per_ltc_frame = double(session.frame_rate()) / timecode.rate;
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC reset to FPS: %1%2 ; audio-frames per LTC: %3\n",
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detected_fps, df?"df":"ndf", frames_per_ltc_frame));
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fps_changed=true;
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}
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/* poll and check session TC */
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TimecodeFormat tc_format = apparent_timecode_format();
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TimecodeFormat cur_timecode = session.config.get_timecode_format();
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if (Config->get_timecode_sync_frame_rate()) {
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/* enforce time-code */
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if (!did_reset_tc_format) {
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saved_tc_format = cur_timecode;
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did_reset_tc_format = true;
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}
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if (cur_timecode != tc_format) {
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if (ceil(Timecode::timecode_to_frames_per_second(cur_timecode)) != ceil(Timecode::timecode_to_frames_per_second(tc_format))) {
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warning << string_compose(_("Session framerate adjusted from %1 to LTC's %2."),
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Timecode::timecode_format_name(cur_timecode),
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Timecode::timecode_format_name(tc_format))
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<< endmsg;
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}
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session.config.set_timecode_format (tc_format);
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}
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} else {
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/* only warn about TC mismatch */
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if (ltc_timecode != tc_format) printed_timecode_warning = false;
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if (a3e_timecode != cur_timecode) printed_timecode_warning = false;
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if (cur_timecode != tc_format && ! printed_timecode_warning) {
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if (ceil(Timecode::timecode_to_frames_per_second(cur_timecode)) != ceil(Timecode::timecode_to_frames_per_second(tc_format))) {
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warning << string_compose(_("Session and LTC framerate mismatch: LTC:%1 Session:%2."),
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Timecode::timecode_format_name(tc_format),
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Timecode::timecode_format_name(cur_timecode))
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<< endmsg;
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}
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printed_timecode_warning = true;
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}
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}
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ltc_timecode = tc_format;
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a3e_timecode = cur_timecode;
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return fps_changed;
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}
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void
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LTC_Slave::process_ltc(framepos_t const /*now*/)
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{
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LTCFrameExt frame;
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enum LTC_TV_STANDARD tv_standard = LTC_TV_625_50;
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while (ltc_decoder_read(decoder, &frame)) {
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SMPTETimecode stime;
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ltc_frame_to_time(&stime, &frame.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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bool ltc_is_static = equal_ltc_frame_time(&prev_frame.ltc, &frame.ltc);
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if (detect_discontinuity(&frame, ceil(timecode.rate), !fps_detected)) {
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if (fps_detected) { ltc_detect_fps_cnt = ltc_detect_fps_max = 0; }
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fps_detected=false;
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}
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if (!ltc_is_static && detect_ltc_fps(stime.frame, (frame.ltc.dfbit)? true : false)) {
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reset();
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fps_detected=true;
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}
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#if 0 // Devel/Debug
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fprintf(stdout, "LTC %02d:%02d:%02d%c%02d | %8lld %8lld%s\n",
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stime.hours,
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stime.mins,
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stime.secs,
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(frame.ltc.dfbit) ? '.' : ':',
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stime.frame,
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frame.off_start,
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frame.off_end,
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frame.reverse ? " R" : " "
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);
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#endif
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/* when a full LTC frame is decoded, the timecode the LTC frame
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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 frame
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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 (!frame.reverse) {
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ltc_frame_increment(&frame.ltc, fps_i, tv_standard, 0);
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ltc_frame_to_time(&stime, &frame.ltc, 0);
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transport_direction = 1;
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frame.off_start -= ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
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frame.off_end -= ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
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} else {
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ltc_frame_decrement(&frame.ltc, fps_i, tv_standard, 0);
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int off = frame.off_end - frame.off_start;
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frame.off_start += off - ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
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frame.off_end += off - ltc_frame_alignment(session.frames_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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/* map LTC timecode to session TC setting */
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framepos_t ltc_frame; ///< audio-frame corresponding to LTC frame
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Timecode::timecode_to_sample (timecode, ltc_frame, true, false,
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double(session.frame_rate()),
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session.config.get_subframes_per_frame(),
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timecode_negative_offset, timecode_offset
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);
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ltc_frame += ltc_slave_latency.max + session.worst_playback_latency();
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framepos_t cur_timestamp = frame.off_end + 1;
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC F: %1 LF: %2 N: %3 L: %4\n", ltc_frame, last_ltc_frame, cur_timestamp, last_timestamp));
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if (frame.off_end + 1 <= last_timestamp || last_timestamp == 0) {
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed: UNCHANGED: %1\n", ltc_speed));
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} else {
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ltc_speed = double(ltc_frame - last_ltc_frame) / double(cur_timestamp - last_timestamp);
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed: %1\n", ltc_speed));
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}
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if (fabs(ltc_speed) > 10.0) {
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ltc_speed = 0;
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}
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last_timestamp = frame.off_end + 1;
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last_ltc_frame = ltc_frame;
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} /* end foreach decoded LTC frame */
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}
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void
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LTC_Slave::init_engine_dll (framepos_t pos, int32_t inc)
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{
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double omega = 2.0 * M_PI * double(inc) / double(session.frame_rate());
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b = 1.4142135623730950488 * omega;
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c = omega * omega;
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e2 = double(ltc_speed * inc);
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t0 = double(pos);
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t1 = t0 + e2;
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DEBUG_TRACE (DEBUG::LTC, string_compose ("[re-]init Engine DLL %1 %2 %3\n", t0, t1, e2));
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}
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/* main entry point from session_process.cc
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* called from process callback context
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* so it is OK to use get_buffer()
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*/
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bool
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LTC_Slave::speed_and_position (double& speed, framepos_t& pos)
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{
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bool engine_init_called = false;
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framepos_t now = session.engine().sample_time_at_cycle_start();
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framepos_t sess_pos = session.transport_frame(); // corresponds to now
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framecnt_t nframes = session.engine().samples_per_cycle();
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Sample* in;
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boost::shared_ptr<Port> ltcport = session.ltc_input_port();
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in = (Sample*) AudioEngine::instance()->port_engine().get_buffer (ltcport->port_handle(), nframes);
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frameoffset_t skip = now - (monotonic_cnt + nframes);
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monotonic_cnt = now;
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DEBUG_TRACE (DEBUG::LTC, string_compose ("speed_and_position - TID:%1 | latency: %2 | skip %3\n", pthread_name(), ltc_slave_latency.max, skip));
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if (last_timestamp == 0) {
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engine_dll_initstate = 0;
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if (delayedlocked < 10) ++delayedlocked;
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} else if (engine_dll_initstate != transport_direction && ltc_speed != 0) {
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ActiveChanged (true); /* EMIT SIGNAL */
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engine_dll_initstate = transport_direction;
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init_engine_dll(last_ltc_frame + rint(ltc_speed * double(2 * nframes + now - last_timestamp)),
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session.engine().samples_per_cycle());
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engine_init_called = true;
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}
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if (in) {
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DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC Process eng-tme: %1 eng-pos: %2\n", now, sess_pos));
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/* when the jack-graph changes and if ardour performs
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* locates, the audioengine is stopped (skipping frames) while
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* jack [time] moves along.
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*/
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if (skip > 0) {
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DEBUG_TRACE (DEBUG::LTC, string_compose("engine skipped %1 frames. Feeding silence to LTC parser.\n", skip));
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if (skip >= 8192) skip = 8192;
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unsigned char sound[8192];
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memset(sound, 0, sizeof(char) * skip);
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ltc_decoder_write(decoder, sound, nframes, now);
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} 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 frames\n", skip));
|
|
reset();
|
|
}
|
|
|
|
parse_ltc(nframes, in, now);
|
|
process_ltc(now);
|
|
}
|
|
|
|
if (last_timestamp == 0) {
|
|
DEBUG_TRACE (DEBUG::LTC, "last timestamp == 0\n");
|
|
speed = 0;
|
|
pos = session.transport_frame();
|
|
return true;
|
|
} else if (ltc_speed != 0) {
|
|
if (delayedlocked > 1) delayedlocked--;
|
|
else if (current_delta == 0) delayedlocked = 0;
|
|
}
|
|
|
|
if (abs(now - last_timestamp) > FLYWHEEL_TIMEOUT) {
|
|
DEBUG_TRACE (DEBUG::LTC, "flywheel timeout\n");
|
|
reset();
|
|
speed = 0;
|
|
pos = session.transport_frame();
|
|
ActiveChanged (false); /* EMIT SIGNAL */
|
|
return true;
|
|
}
|
|
|
|
/* it take 2 cycles from naught to rolling.
|
|
* during these to initial cycles the speed == 0
|
|
*
|
|
* the first cycle:
|
|
* DEBUG::Slave: slave stopped, move to NNN
|
|
* DEBUG::Transport: Request forced locate to NNN
|
|
* DEBUG::Slave: slave state 0 @ NNN speed 0 cur delta VERY-LARGE-DELTA avg delta 1800
|
|
* DEBUG::Slave: silent motion
|
|
* DEBUG::Transport: realtime stop @ NNN
|
|
* DEBUG::Transport: Butler transport work, todo = PostTransportStop,PostTransportLocate,PostTransportClearSubstate
|
|
*
|
|
* [engine skips frames to locate, jack time keeps rolling on]
|
|
*
|
|
* the second cycle:
|
|
*
|
|
* DEBUG::LTC: [re-]init Engine DLL
|
|
* DEBUG::Slave: slave stopped, move to NNN+
|
|
* ...
|
|
*
|
|
* we need to seek two cycles ahead: 2 * nframes
|
|
*/
|
|
if (engine_dll_initstate == 0) {
|
|
DEBUG_TRACE (DEBUG::LTC, "engine DLL not initialized. ltc_speed\n");
|
|
speed = 0;
|
|
pos = last_ltc_frame + rint(ltc_speed * double(2 * nframes + now - last_timestamp));
|
|
return true;
|
|
}
|
|
|
|
/* interpolate position according to speed and time since last LTC-frame*/
|
|
double speed_flt = ltc_speed;
|
|
double elapsed = (now - last_timestamp) * speed_flt;
|
|
|
|
if (!engine_init_called) {
|
|
const double e = elapsed + double (last_ltc_frame - sess_pos);
|
|
t0 = t1;
|
|
t1 += b * e + e2;
|
|
e2 += c * e;
|
|
speed_flt = (t1 - t0) / double(session.engine().samples_per_cycle());
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC engine DLL t0:%1 t1:%2 err:%3 spd:%4 ddt:%5\n", t0, t1, e, speed_flt, e2 - session.engine().samples_per_cycle() ));
|
|
} else {
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC adjusting elapsed (no DLL) from %1 by %2\n", elapsed, (2 * nframes * ltc_speed)));
|
|
speed_flt = 0;
|
|
elapsed += 2.0 * nframes * ltc_speed; /* see note above */
|
|
}
|
|
|
|
pos = last_ltc_frame + rint(elapsed);
|
|
speed = speed_flt;
|
|
current_delta = (pos - sess_pos);
|
|
|
|
if (((pos < 0) || (labs(current_delta) > 2 * session.frame_rate()))) {
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC large drift: %1\n", current_delta));
|
|
reset();
|
|
speed = 0;
|
|
pos = session.transport_frame();
|
|
return true;
|
|
}
|
|
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTCsync spd: %1 pos: %2 | last-pos: %3 elapsed: %4 delta: %5\n",
|
|
speed, pos, last_ltc_frame, elapsed, current_delta));
|
|
|
|
/* provide a .1% deadzone to lock the speed */
|
|
if (fabs(speed - 1.0) <= 0.001) {
|
|
speed = 1.0;
|
|
}
|
|
|
|
if (speed != 0 && delayedlocked == 0 && fabs(speed) != 1.0) {
|
|
sync_lock_broken = true;
|
|
DEBUG_TRACE (DEBUG::LTC, string_compose ("LTC speed not locked %1 %2\n", speed, ltc_speed));
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
Timecode::TimecodeFormat
|
|
LTC_Slave::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 (Config->get_timecode_source_2997() ? timecode_2997000 : timecode_2997);
|
|
else if (rint(timecode.rate * 100) == 2997 && timecode.drop)
|
|
return (Config->get_timecode_source_2997() ? timecode_2997000drop : timecode_2997drop);
|
|
else if (timecode.rate == 30 && timecode.drop)
|
|
return timecode_2997drop; // timecode_30drop; // LTC counting to 30 frames w/DF *means* 29.97 df
|
|
else if (timecode.rate == 30 && !timecode.drop)
|
|
return timecode_30;
|
|
|
|
/* XXX - unknown timecode format */
|
|
return session.config.get_timecode_format();
|
|
}
|
|
|
|
std::string
|
|
LTC_Slave::approximate_current_position() const
|
|
{
|
|
if (last_timestamp == 0) {
|
|
return " --:--:--:--";
|
|
}
|
|
return Timecode::timecode_format_time(timecode);
|
|
}
|
|
|
|
std::string
|
|
LTC_Slave::approximate_current_delta() const
|
|
{
|
|
char delta[80];
|
|
if (last_timestamp == 0 || engine_dll_initstate == 0) {
|
|
snprintf(delta, sizeof(delta), "\u2012\u2012\u2012\u2012");
|
|
} else if ((monotonic_cnt - last_timestamp) > 2 * frames_per_ltc_frame) {
|
|
snprintf(delta, sizeof(delta), "%s", _("flywheel"));
|
|
} else {
|
|
snprintf(delta, sizeof(delta), "\u0394<span foreground=\"%s\" face=\"monospace\" >%s%s%lld</span>sm",
|
|
sync_lock_broken ? "red" : "green",
|
|
LEADINGZERO(::llabs(current_delta)), PLUSMINUS(-current_delta), ::llabs(current_delta));
|
|
}
|
|
return std::string(delta);
|
|
}
|