outline a "NoSampleAccurateControl" LV2 feature:

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

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index bed66b62afbf5b65c985db64e169acd9076d98f6..940ec8ae0389ac49a47057a89da98f5550fb2f0a 100644 (file)
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -155,6 +155,7 @@ public:
        LilvNode* units_midiNote;
        LilvNode* patch_writable;
        LilvNode* patch_Message;
+       LilvNode* lv2_noSampleAccurateCtrl;
 #ifdef HAVE_LV2_1_2_0
        LilvNode* bufz_powerOf2BlockLength;
        LilvNode* bufz_fixedBlockLength;
@@ -244,7 +245,9 @@ struct LV2Plugin::Impl {
 #endif
               , state(0)
               , block_length(0)
+#ifdef HAVE_LV2_1_2_0
               , options(0)
+#endif
        {}
 
        /** Find the LV2 input port with the given designation.
@@ -266,7 +269,9 @@ struct LV2Plugin::Impl {
        LV2_Atom_Forge               forge;
        LV2_Atom_Forge               ui_forge;
        int32_t                      block_length;
+#ifdef HAVE_LV2_1_2_0
        LV2_Options_Option*          options;
+#endif
 };
 
 LV2Plugin::LV2Plugin (AudioEngine& engine,
@@ -282,6 +287,7 @@ LV2Plugin::LV2Plugin (AudioEngine& engine,
        , _patch_port_in_index((uint32_t)-1)
        , _patch_port_out_index((uint32_t)-1)
        , _uri_map(URIMap::instance())
+       , _no_sample_accurate_ctrl (false)
 {
        init(c_plugin, rate);
 }
@@ -296,6 +302,7 @@ LV2Plugin::LV2Plugin (const LV2Plugin& other)
        , _patch_port_in_index((uint32_t)-1)
        , _patch_port_out_index((uint32_t)-1)
        , _uri_map(URIMap::instance())
+       , _no_sample_accurate_ctrl (false)
 {
        init(other._impl->plugin, other._sample_rate);
 
@@ -477,6 +484,12 @@ LV2Plugin::init(const void* c_plugin, framecnt_t rate)
                throw failed_constructor();
        }
        lilv_nodes_free(required_features);
+
+       LilvNodes* optional_features = lilv_plugin_get_optional_features (plugin);
+       if (lilv_nodes_contains (optional_features, _world.lv2_noSampleAccurateCtrl)) {
+               _no_sample_accurate_ctrl = true;
+       }
+       lilv_nodes_free(optional_features);
 #endif
 
 #ifdef HAVE_LILV_0_16_0
@@ -681,6 +694,25 @@ LV2Plugin::set_block_size (pframes_t nframes)
        return 0;
 }
 
+bool
+LV2Plugin::requires_fixed_sized_buffers () const
+{
+       /* This controls if Ardour will split the plugin's run()
+        * on automation events in order to pass sample-accurate automation
+        * via standard control-ports.
+        *
+        * When returning true Ardour will *not* sub-divide the process-cycle.
+        * Automation events that happen between cycle-start and cycle-end will be
+        * ignored (ctrl values are interpolated to cycle-start).
+        * NB. Atom Sequences are still sample accurate.
+        *
+        * Note: This does not guarantee a fixed block-size.
+        * e.g The process cycle may be split when looping, also
+        * the period-size may change any time: see set_block_size()
+        */
+       return _no_sample_accurate_ctrl;
+}
+
 LV2Plugin::~LV2Plugin ()
 {
        DEBUG_TRACE(DEBUG::LV2, string_compose("%1 destroy\n", name()));
@@ -692,7 +724,9 @@ LV2Plugin::~LV2Plugin ()
        lilv_state_free(_impl->state);
        lilv_node_free(_impl->name);
        lilv_node_free(_impl->author);
+#ifdef HAVE_LV2_1_2_0
        free(_impl->options);
+#endif
 
        free(_features);
        free(_make_path_feature.data);
@@ -2442,6 +2476,7 @@ LV2World::LV2World()
        units_db           = lilv_new_uri(world, LV2_UNITS__db);
        patch_writable     = lilv_new_uri(world, LV2_PATCH__writable);
        patch_Message      = lilv_new_uri(world, LV2_PATCH__Message);
+       lv2_noSampleAccurateCtrl = lilv_new_uri(world, LV2_CORE_PREFIX "NoSampleAccurateCtrl"); // XXX
 #ifdef HAVE_LV2_1_2_0
        bufz_powerOf2BlockLength = lilv_new_uri(world, LV2_BUF_SIZE__powerOf2BlockLength);
        bufz_fixedBlockLength    = lilv_new_uri(world, LV2_BUF_SIZE__fixedBlockLength);
@@ -2457,6 +2492,7 @@ LV2World::~LV2World()
        lilv_node_free(bufz_fixedBlockLength);
        lilv_node_free(bufz_powerOf2BlockLength);
 #endif
+       lilv_node_free(lv2_noSampleAccurateCtrl);
        lilv_node_free(patch_Message);
        lilv_node_free(patch_writable);
        lilv_node_free(units_hz);
@@ -2555,6 +2591,17 @@ LV2PluginInfo::load(Session& session)
        return PluginPtr();
 }
 
+bool
+LV2PluginInfo::in_category (const std::string &c) const
+{
+       // TODO use untranslated lilv_plugin_get_class()
+       // match gtk2_ardour/plugin_selector.cc
+       if (category == c) {
+               return true;
+       }
+       return false;
+}
+
 PluginInfoList*
 LV2PluginInfo::discover()
 {