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Add API to query I/O latency from port-engine

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This allows to get public latency ranges for any port
including Ardour's latency-compensation as well as including
any latency induced by external JACK applications.

It is mainly useful to detect ambiguous latency and to
forward public port latency of connected ports.
This commit is contained in:
Robin Gareus 2021-09-14 21:25:44 +02:00
parent f2ea9461f2
commit a84cb976a0
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
2 changed files with 40 additions and 0 deletions
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2
libs/ardour/ardour/port.h
View File

@ -107,6 +107,8 @@ public:
void get_connected_latency_range (LatencyRange& range, bool playback) const;
void collect_latency_from_backend (LatencyRange& range, bool playback) const;
void set_private_latency_range (LatencyRange& range, bool playback);
const LatencyRange& private_latency_range (bool playback) const;

38
libs/ardour/port.cc
View File

@ -452,6 +452,44 @@ Port::public_latency_range (bool playback) const
return r;
}
void
Port::collect_latency_from_backend (LatencyRange& range, bool playback) const
{
vector<string> connections;
get_connections (connections);
DEBUG_TRACE (DEBUG::LatencyIO, string_compose ("%1: %2 connections to check for real %3 latency range\n",
name(), connections.size(),
playback ? "PLAYBACK" : "CAPTURE"));
for (vector<string>::const_iterator c = connections.begin(); c != connections.end(); ++c) {
PortEngine::PortHandle ph = port_engine.get_port_by_name (*c);
if (!ph) {
continue;
}
LatencyRange lr = port_engine.get_latency_range (ph, playback);
if (!AudioEngine::instance()->port_is_mine (*c)) {
if (externally_connected () && 0 == (_flags & TransportSyncPort) && sends_output () == playback) {
if (type () == DataType::AUDIO) {
lr.min += (_resampler_quality - 1);
lr.max += (_resampler_quality - 1);
}
}
}
DEBUG_TRACE (DEBUG::LatencyIO, string_compose (
"\t%1 <-> %2 : latter has latency range %3 .. %4\n",
name(), *c, lr.min, lr.max));
range.min = min (range.min, lr.min);
range.max = max (range.max, lr.max);
}
DEBUG_TRACE (DEBUG::LatencyIO, string_compose ("%1: real latency range now [ %2 .. %3 ] \n", name(), range.min, range.max));
}
void
Port::get_connected_latency_range (LatencyRange& range, bool playback) const
{