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AU: install latency listener

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Don't query after every cycle, some plugins inject license checks
when a host queries latency (!)
This commit is contained in:
Robin Gareus
2016-07-16 05:05:52 +02:00
parent 8219fdee07
commit 25a4cae8ad
2 changed files with 27 additions and 3 deletions
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1
libs/ardour/ardour/audio_unit.h
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@@ -171,6 +171,7 @@ class LIBARDOUR_API AUPlugin : public ARDOUR::Plugin
int32_t output_channels;
std::vector<std::pair<int,int> > io_configs;
framecnt_t _last_nframes;
mutable framecnt_t _current_latency;
bool _requires_fixed_size_buffers;
AudioBufferList* buffers;
bool _has_midi_input;

29
libs/ardour/audio_unit.cc
View File

@@ -955,7 +955,10 @@ AUPlugin::default_value (uint32_t port)
framecnt_t
AUPlugin::signal_latency () const
{
return unit->Latency() * _session.frame_rate();
if (_current_latency < 0) {
_current_latency = unit->Latency() * _session.frame_rate();
}
return _current_latency;
}
void
@@ -1082,8 +1085,6 @@ AUPlugin::set_block_size (pframes_t nframes)
activate ();
}
_current_block_size = nframes;
return 0;
}
@@ -3362,6 +3363,19 @@ AUPlugin::create_parameter_listener (AUEventListenerProc cb, void* arg, float in
_parameter_listener_arg = arg;
// listen for latency changes
AudioUnitEvent event;
event.mEventType = kAudioUnitEvent_PropertyChange;
event.mArgument.mProperty.mAudioUnit = unit->AU();
event.mArgument.mProperty.mPropertyID = kAudioUnitProperty_Latency;
event.mArgument.mProperty.mScope = kAudioUnitScope_Global;
event.mArgument.mProperty.mElement = 0;
if (AUEventListenerAddEventType (_parameter_listener, _parameter_listener_arg, &event) != noErr) {
PBD::error << "Failed to create latency event listener\n";
// TODO don't cache _current_latency
}
return 0;
}
@@ -3458,6 +3472,15 @@ AUPlugin::_parameter_change_listener (void* arg, void* src, const AudioUnitEvent
void
AUPlugin::parameter_change_listener (void* /*arg*/, void* src, const AudioUnitEvent* event, UInt64 /*host_time*/, Float32 new_value)
{
if (event->mEventType == kAudioUnitEvent_PropertyChange) {
if (event->mArgument.mProperty.mPropertyID == kAudioUnitProperty_Latency) {
DEBUG_TRACE (DEBUG::AudioUnits, string_compose("AU Latency Change Event %1 <> %1\n", new_value, unit->Latency()));
// TODO atomically set //_current_latency = -1;
_current_latency = unit->Latency() * _session.frame_rate(); // TODO: check: new_value
}
return;
}
ParameterMap::iterator i;
if ((i = parameter_map.find (event->mArgument.mParameter.mParameterID)) == parameter_map.end()) {