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Fix loading LV2 channel numbers from standard/common port groups

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This code only worked for port groups that themselves (the specific group
instance) listed their designations.  This worked with LSP, which redundantly
duplicates the elements from the group's class for some reason, but not with
other plugins like MDA which simply refer to a standard group like
<http://lv2plug.in/ns/ext/port-groups#StereoGroup>.

This does require the specification data to be loaded from the LV2 path (maybe
why LSP does that?), but that's generally expected for anything LV2 to work.
This commit is contained in:
David Robillard 2025-09-27 21:21:17 -04:00
parent 14e8b66b61
commit 625ad2af77
1 changed files with 33 additions and 18 deletions
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51
libs/ardour/lv2_plugin.cc
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@ -203,6 +203,7 @@ public:
LilvNode* lv2_sampleRate;
LilvNode* lv2_toggled;
LilvNode* midi_MidiEvent;
LilvNode* rdf_type;
LilvNode* rdfs_comment;
LilvNode* rdfs_label;
LilvNode* rdfs_range;
@ -2493,36 +2494,48 @@ LV2Plugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id) const
LilvNodes* groups = lilv_port_get_value (_impl->plugin, pport, _world.groups_group);
if (lilv_nodes_size (groups) > 0) {
const LilvNode* group = lilv_nodes_get_first (groups);
LilvNodes* grouplabel = lilv_world_find_nodes (_world.world, group, _world.rdfs_label, NULL);
/* get the name of the port-group */
if (lilv_nodes_size (grouplabel) > 0) {
const LilvNode* grpname = lilv_nodes_get_first (grouplabel);
LilvNode* grpname = lilv_world_get (_world.world, group, _world.rdfs_label, NULL);
if (grpname) {
iod.group_name = lilv_node_as_string (grpname);
// TODO set iod.bus_number (nth group)
}
lilv_nodes_free (grouplabel);
lilv_node_free (grpname);
/* get all port designations.
* we're interested in e.g. lv2:designation pg:right */
LilvNodes* designations = lilv_port_get_value (_impl->plugin, pport, _world.lv2_designation);
if (lilv_nodes_size (designations) > 0) {
/* get all pg:elements of the pg:group */
LilvNodes* group_childs = lilv_world_find_nodes (_world.world, group, _world.groups_element, NULL);
if (lilv_nodes_size (group_childs) > 0) {
/* iterate over all port designations .. */
LILV_FOREACH (nodes, i, designations) {
const LilvNode* designation = lilv_nodes_get (designations, i);
/* match the lv2:designation's element against the port-group's element */
LILV_FOREACH (nodes, j, group_childs) {
const LilvNode* group_element = lilv_nodes_get (group_childs, j);
LilvNodes* elem = lilv_world_find_nodes (_world.world, group_element, _world.lv2_designation, designation);
LilvNodes* elements = lilv_world_find_nodes (_world.world, group, _world.groups_element, NULL);
if (!elements) {
/* group itself doesn't have elements, try its classes (like pg:StereoGroup) */
LilvNodes* group_classes = lilv_world_find_nodes (_world.world, group, _world.rdf_type, NULL);
LILV_FOREACH (nodes, i, group_classes) {
const LilvNode* group_class = lilv_nodes_get (group_classes, i);
elements = lilv_world_find_nodes (_world.world, group_class, _world.groups_element, NULL);
if (elements) {
break;
}
}
lilv_nodes_free(group_classes);
}
/* iterate over all port designations .. */
LILV_FOREACH (nodes, i, designations) {
const LilvNode* designation = lilv_nodes_get (designations, i);
/* search the group for an element with the same designation as the port */
LILV_FOREACH (nodes, j, elements) {
const LilvNode* element = lilv_nodes_get (elements, j);
if (lilv_world_ask (_world.world, element, _world.lv2_designation, designation)) {
/* found it. Now look up the index (channel-number) of the pg:Element */
if (lilv_nodes_size (elem) > 0) {
LilvNodes* idx = lilv_world_find_nodes (_world.world, lilv_nodes_get_first (elem), _world.lv2_index, NULL);
if (lilv_node_is_int (lilv_nodes_get_first (idx))) {
iod.group_channel = lilv_node_as_int(lilv_nodes_get_first (idx));
}
LilvNode* idx = lilv_world_get (_world.world, element, _world.lv2_index, NULL);
const bool is_int = lilv_node_is_int(idx);
iod.group_channel = lilv_node_as_int(idx);
lilv_node_free(idx);
if (is_int) {
break;
}
}
}
@ -3536,6 +3549,7 @@ LV2World::LV2World()
lv2_enumeration = lilv_new_uri(world, LV2_CORE__enumeration);
lv2_freewheeling = lilv_new_uri(world, LV2_CORE__freeWheeling);
midi_MidiEvent = lilv_new_uri(world, LILV_URI_MIDI_EVENT);
rdf_type = lilv_new_uri(world, LILV_NS_RDF "type");
rdfs_comment = lilv_new_uri(world, LILV_NS_RDFS "comment");
rdfs_label = lilv_new_uri(world, LILV_NS_RDFS "label");
rdfs_range = lilv_new_uri(world, LILV_NS_RDFS "range");
@ -3613,6 +3627,7 @@ LV2World::~LV2World()
lilv_node_free(rdfs_comment);
lilv_node_free(rdfs_label);
lilv_node_free(rdfs_range);
lilv_node_free(rdf_type);
lilv_node_free(midi_MidiEvent);
lilv_node_free(lv2_designation);
lilv_node_free(lv2_enumeration);