tweak LV2 atom buffer allocation strategy

Allow to re-use Midi buffers for GUI communication. Honor
resize-port extension for all Atom Sequence buffers.
(following example of http://lv2plug.in/book/#_sampler)

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 6a5ed97aaebfa5a6860f80bd0396247a4f8d2139..a5c87c8d6a8840651d56e27892481ad36c480b08 100644 (file)
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -2119,8 +2119,7 @@ LV2Plugin::allocate_atom_event_buffers()
                        LilvNodes* atom_supports = lilv_port_get_value(
                                p, port, _world.atom_supports);
 
-                       if (!lilv_nodes_contains(buffer_types, _world.atom_Sequence)
-                                       || !lilv_nodes_contains(atom_supports, _world.midi_MidiEvent)) {
+                       if (lilv_nodes_contains(buffer_types, _world.atom_Sequence)) {
                                if (lilv_port_is_a(p, port, _world.lv2_InputPort)) {
                                        count_atom_in++;
                                }
@@ -2147,7 +2146,7 @@ LV2Plugin::allocate_atom_event_buffers()
                return;
        }
 
-       DEBUG_TRACE(DEBUG::LV2, string_compose("allocate %1 atom_ev_buffers of %d bytes\n", total_atom_buffers, minimumSize));
+       DEBUG_TRACE(DEBUG::LV2, string_compose("allocate %1 atom_ev_buffers of %2 bytes\n", total_atom_buffers, minimumSize));
        _atom_ev_buffers = (LV2_Evbuf**) malloc((total_atom_buffers + 1) * sizeof(LV2_Evbuf*));
        for (int i = 0; i < total_atom_buffers; ++i ) {
                _atom_ev_buffers[i] = lv2_evbuf_new(minimumSize, LV2_EVBUF_ATOM,