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Fix stem export alignment 

When a track's output is not connected, but the track feeds
other tracks via sends (common case in Mixbus) the stem
export of the track was not correctly aligned.

The track is correctly latency compensated (due to sends), but
the unconnected port's latency is not set.
However stem-export uses the private latency of the port as alignment.
This commit is contained in:
Robin Gareus 2022-03-04 01:37:12 +01:00
parent 2323b08502
commit bc1be2fc24
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 16 additions and 1 deletions
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17
libs/ardour/route.cc
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@ -4939,6 +4939,7 @@ Route::update_port_latencies (PortSet& from, PortSet& to, bool playback, samplec
*/
LatencyRange all_connections;
bool connected = false;
if (from.empty()) {
all_connections.min = 0;
@ -4963,6 +4964,7 @@ Route::update_port_latencies (PortSet& from, PortSet& to, bool playback, samplec
all_connections.min = min (all_connections.min, range.min);
all_connections.max = max (all_connections.max, range.max);
connected = true;
}
if (all_connections.min == ~((pframes_t) 0)) {
@ -4970,10 +4972,23 @@ Route::update_port_latencies (PortSet& from, PortSet& to, bool playback, samplec
}
}
/* if the output is not connected, its latency is not relevant,
* however stem-export uses the private latency of the port as alignment.
* see PortExportChannel::common_port_playback_latency()
* and PortExportChannel::prepare_export()
*
* So for correct alignment we use the Delivery's playback latency.
*/
LatencyRange outport_latency = all_connections;
if (playback && _main_outs && !connected) {
outport_latency.min = _main_outs->playback_offset () - _main_outs->input_latency ();
outport_latency.max = _main_outs->playback_offset () - _main_outs->input_latency ();
}
/* set the "from" port latencies to the max/min range of all their connections */
for (PortSet::iterator p = from.begin(); p != from.end(); ++p) {
p->set_private_latency_range (all_connections, playback);
p->set_private_latency_range (outport_latency, playback);
}
DEBUG_TRACE (DEBUG::LatencyRoute, string_compose ("%1: priv. port L(%2) = (%3, %4) + %5\n", _name, playback ? "playback" : "capture", all_connections.min, all_connections.max, our_latency));