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nominal improvement for MTC master: use port latency to adjust sampletimes that MTC events "occured at"

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This commit is contained in:
Paul Davis 2020-04-27 15:02:22 -06:00
parent 1280360a65
commit c56e99cd09
2 changed files with 19 additions and 0 deletions
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3
libs/ardour/ardour/transport_master.h
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@ -501,6 +501,9 @@ class LIBARDOUR_API MTC_TransportMaster : public TimecodeTransportMaster, public
void init_mtc_dll(samplepos_t, double); void init_mtc_dll(samplepos_t, double);
void parse_timecode_offset(); void parse_timecode_offset();
void parameter_changed(std::string const & p); void parameter_changed(std::string const & p);
void resync_latency();
LatencyRange mtc_slave_latency;
}; };
class LIBARDOUR_API LTC_TransportMaster : public TimecodeTransportMaster { class LIBARDOUR_API LTC_TransportMaster : public TimecodeTransportMaster {

16
libs/ardour/mtc_slave.cc
View file

@ -70,6 +70,10 @@ MTC_TransportMaster::MTC_TransportMaster (std::string const & name)
, printed_timecode_warning (false) , printed_timecode_warning (false)
{ {
init (); init ();
resync_latency();
AudioEngine::instance()->GraphReordered.connect_same_thread (port_connections, boost::bind (&MTC_TransportMaster::resync_latency, this));
} }
MTC_TransportMaster::~MTC_TransportMaster() MTC_TransportMaster::~MTC_TransportMaster()
@ -88,6 +92,16 @@ MTC_TransportMaster::init ()
reset (true); reset (true);
} }
void
MTC_TransportMaster::resync_latency()
{
DEBUG_TRACE (DEBUG::MTC, "MTC resync_latency()\n");
if (_port) {
_port->get_connected_latency_range (mtc_slave_latency, false);
}
}
void void
MTC_TransportMaster::create_port () MTC_TransportMaster::create_port ()
{ {
@ -129,6 +143,8 @@ MTC_TransportMaster::pre_process (MIDI::pframes_t nframes, samplepos_t now, boos
maybe_reset (); maybe_reset ();
now -= mtc_slave_latency.max;
_midi_port->read_and_parse_entire_midi_buffer_with_no_speed_adjustment (nframes, parser, now); _midi_port->read_and_parse_entire_midi_buffer_with_no_speed_adjustment (nframes, parser, now);
if (session_pos) { if (session_pos) {