fix plugin silence runs (e.g. during audition)

[ardour.git] / libs / ardour / lv2_plugin.cc

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 46582a5fcfffde1d7cfe5e66b53bd5d6932504d4..5194ae6166e064bd8762e226a4a4261349024614 100644 (file)
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -365,6 +365,8 @@ LV2Plugin::init(const void* c_plugin, framecnt_t rate)
        _was_activated          = false;
        _has_state_interface    = false;
        _can_write_automation   = false;
+       _max_latency            = 0;
+       _current_latency        = 0;
        _impl->block_length     = _session.get_block_size();
 
        _instance_access_feature.URI = "http://lv2plug.in/ns/ext/instance-access";
@@ -673,6 +675,9 @@ LV2Plugin::init(const void* c_plugin, framecnt_t rate)
                        lilv_instance_connect_port(_impl->instance, i, &_control_data[i]);
 
                        if (latent && i == latency_index) {
+                               LilvNode *max;
+                               lilv_port_get_range(_impl->plugin, port, NULL, NULL, &max);
+                               _max_latency = max ? lilv_node_as_float(max) : .02 * _sample_rate;
                                _latency_control_port  = &_control_data[i];
                                *_latency_control_port = 0;
                        }
@@ -1929,7 +1934,7 @@ LV2Plugin::get_parameter_descriptor(uint32_t which, ParameterDescriptor& desc) c
 }
 
 Plugin::IOPortDescription
-LV2Plugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id)
+LV2Plugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id) const
 {
        PortFlags match = 0;
        switch (dt) {
@@ -2008,6 +2013,12 @@ LV2Plugin::describe_parameter(Evoral::Parameter which)
        }
 }
 
+framecnt_t
+LV2Plugin::max_latency () const
+{
+       return _max_latency;
+}
+
 framecnt_t
 LV2Plugin::signal_latency() const
 {
@@ -2546,6 +2557,13 @@ LV2Plugin::connect_and_run(BufferSet& bufs,
        _next_cycle_speed = _session.transport_speed();
        _next_cycle_start = _session.transport_frame() + (nframes * _next_cycle_speed);
 
+       if (_latency_control_port) {
+               framecnt_t new_latency = signal_latency ();
+               if (_current_latency != new_latency) {
+                       LatencyChanged (_current_latency, new_latency); /* EMIT SIGNAL */
+               }
+               _current_latency = new_latency;
+       }
        return 0;
 }
 
@@ -2757,7 +2775,7 @@ LV2World::LV2World()
        patch_writable     = lilv_new_uri(world, LV2_PATCH__writable);
        patch_Message      = lilv_new_uri(world, LV2_PATCH__Message);
 #ifdef LV2_EXTENDED
-       lv2_noSampleAccurateCtrl    = lilv_new_uri(world, LV2_CORE_PREFIX "noSampleAccurateControls");
+       lv2_noSampleAccurateCtrl    = lilv_new_uri(world, "http://ardour.org/lv2/ext#noSampleAccurateControls");
        auto_can_write_automatation = lilv_new_uri(world, LV2_AUTOMATE_URI__can_write);
        auto_automation_control     = lilv_new_uri(world, LV2_AUTOMATE_URI__control);
        auto_automation_controlled  = lilv_new_uri(world, LV2_AUTOMATE_URI__controlled);