X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Flua_api.cc;h=59d27493998925a445366ce80b64755f28455614;hb=9336bddee2b40e3e70699eec897ca100074db87a;hp=99a9b1b49337e9bc0da9761eee6dec8b0d6ae953;hpb=d7a95b5b50a8bf9894a300450f8b3952e7e624a8;p=ardour.git

diff --git a/libs/ardour/lua_api.cc b/libs/ardour/lua_api.cc
index 99a9b1b493..59d2749399 100644
--- a/libs/ardour/lua_api.cc
+++ b/libs/ardour/lua_api.cc
@@ -17,22 +17,59 @@
  *
  */
 #include <cstring>
+#include <vamp-hostsdk/PluginLoader.h>
 
-#include "pbd/error.h"
 #include "pbd/compose.h"
+#include "pbd/error.h"
+#include "pbd/failed_constructor.h"
 
 #include "ardour/lua_api.h"
 #include "ardour/luaproc.h"
 #include "ardour/luascripting.h"
 #include "ardour/plugin.h"
 #include "ardour/plugin_insert.h"
+#include "ardour/plugin_manager.h"
+#include "ardour/readable.h"
 
-#include "i18n.h"
+#include "LuaBridge/LuaBridge.h"
+
+#include "pbd/i18n.h"
 
 using namespace ARDOUR;
 using namespace PBD;
 using namespace std;
 
+int
+ARDOUR::LuaAPI::datatype_ctor_null (lua_State *L)
+{
+	DataType dt (DataType::NIL);
+	luabridge::Stack <DataType>::push (L, dt);
+	return 1;
+}
+
+int
+ARDOUR::LuaAPI::datatype_ctor_audio (lua_State *L)
+{
+	DataType dt (DataType::AUDIO);
+	// NB luabridge will copy construct the object and manage lifetime.
+	luabridge::Stack <DataType>::push (L, dt);
+	return 1;
+}
+
+int
+ARDOUR::LuaAPI::datatype_ctor_midi (lua_State *L)
+{
+	DataType dt (DataType::MIDI);
+	luabridge::Stack <DataType>::push (L, dt);
+	return 1;
+}
+
+boost::shared_ptr<Processor>
+ARDOUR::LuaAPI::nil_processor ()
+{
+	return boost::shared_ptr<Processor> ();
+}
+
 boost::shared_ptr<Processor>
 ARDOUR::LuaAPI::new_luaproc (Session *s, const string& name)
 {
@@ -42,9 +79,9 @@ ARDOUR::LuaAPI::new_luaproc (Session *s, const string& name)
 
 	LuaScriptInfoPtr spi;
 	ARDOUR::LuaScriptList & _scripts (LuaScripting::instance ().scripts (LuaScriptInfo::DSP));
-	for (LuaScriptList::const_iterator s = _scripts.begin(); s != _scripts.end(); ++s) {
-		if (name == (*s)->name) {
-			spi = *s;
+	for (LuaScriptList::const_iterator i = _scripts.begin (); i != _scripts.end (); ++i) {
+		if (name == (*i)->name) {
+			spi = *i;
 			break;
 		}
 	}
@@ -56,7 +93,7 @@ ARDOUR::LuaAPI::new_luaproc (Session *s, const string& name)
 
 	PluginPtr p;
 	try {
-		LuaPluginInfoPtr lpi (new LuaPluginInfo(spi));
+		LuaPluginInfoPtr lpi (new LuaPluginInfo (spi));
 		p = (lpi->load (*s));
 	} catch (...) {
 		warning << _("Failed to instantiate Lua Processor\n");
@@ -65,3 +102,759 @@ ARDOUR::LuaAPI::new_luaproc (Session *s, const string& name)
 
 	return boost::shared_ptr<Processor> (new PluginInsert (*s, p));
 }
+
+PluginInfoList
+ARDOUR::LuaAPI::list_plugins ()
+{
+	PluginManager& manager = PluginManager::instance ();
+	PluginInfoList all_plugs;
+	all_plugs.insert (all_plugs.end (), manager.ladspa_plugin_info ().begin (), manager.ladspa_plugin_info ().end ());
+	all_plugs.insert (all_plugs.end (), manager.lua_plugin_info ().begin (), manager.lua_plugin_info ().end ());
+#ifdef WINDOWS_VST_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.windows_vst_plugin_info ().begin (), manager.windows_vst_plugin_info ().end ());
+#endif
+#ifdef LXVST_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.lxvst_plugin_info ().begin (), manager.lxvst_plugin_info ().end ());
+#endif
+#ifdef AUDIOUNIT_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.au_plugin_info ().begin (), manager.au_plugin_info ().end ());
+#endif
+#ifdef LV2_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.lv2_plugin_info ().begin (), manager.lv2_plugin_info ().end ());
+#endif
+	all_plugs.insert (all_plugs.end (), manager.lua_plugin_info ().begin (), manager.lua_plugin_info ().end ());
+
+	return all_plugs;
+}
+
+PluginInfoPtr
+ARDOUR::LuaAPI::new_plugin_info (const string& name, ARDOUR::PluginType type)
+{
+	PluginManager& manager = PluginManager::instance ();
+	PluginInfoList all_plugs;
+	all_plugs.insert (all_plugs.end (), manager.ladspa_plugin_info ().begin (), manager.ladspa_plugin_info ().end ());
+	all_plugs.insert (all_plugs.end (), manager.lua_plugin_info ().begin (), manager.lua_plugin_info ().end ());
+#ifdef WINDOWS_VST_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.windows_vst_plugin_info ().begin (), manager.windows_vst_plugin_info ().end ());
+#endif
+#ifdef LXVST_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.lxvst_plugin_info ().begin (), manager.lxvst_plugin_info ().end ());
+#endif
+#ifdef AUDIOUNIT_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.au_plugin_info ().begin (), manager.au_plugin_info ().end ());
+#endif
+#ifdef LV2_SUPPORT
+	all_plugs.insert (all_plugs.end (), manager.lv2_plugin_info ().begin (), manager.lv2_plugin_info ().end ());
+#endif
+	all_plugs.insert (all_plugs.end (), manager.lua_plugin_info ().begin (), manager.lua_plugin_info ().end ());
+
+	for (PluginInfoList::const_iterator i = all_plugs.begin (); i != all_plugs.end (); ++i) {
+		if (((*i)->name == name || (*i)->unique_id == name) && (*i)->type == type) {
+			return *i;
+		}
+	}
+	return PluginInfoPtr ();
+}
+
+boost::shared_ptr<Processor>
+ARDOUR::LuaAPI::new_plugin (Session *s, const string& name, ARDOUR::PluginType type, const string& preset)
+{
+	if (!s) {
+		return boost::shared_ptr<Processor> ();
+	}
+
+	PluginInfoPtr pip = new_plugin_info (name, type);
+
+	if (!pip) {
+		return boost::shared_ptr<Processor> ();
+	}
+
+	PluginPtr p = pip->load (*s);
+	if (!p) {
+		return boost::shared_ptr<Processor> ();
+	}
+
+	if (!preset.empty ()) {
+		const Plugin::PresetRecord *pr = p->preset_by_label (preset);
+		if (pr) {
+			p->load_preset (*pr);
+		}
+	}
+
+	return boost::shared_ptr<Processor> (new PluginInsert (*s, p));
+}
+
+bool
+ARDOUR::LuaAPI::set_plugin_insert_param (boost::shared_ptr<PluginInsert> pi, uint32_t which, float val)
+{
+	boost::shared_ptr<Plugin> plugin = pi->plugin ();
+	if (!plugin) { return false; }
+
+	bool ok=false;
+	uint32_t controlid = plugin->nth_parameter (which, ok);
+	if (!ok) { return false; }
+	if (!plugin->parameter_is_input (controlid)) { return false; }
+
+	ParameterDescriptor pd;
+	if (plugin->get_parameter_descriptor (controlid, pd) != 0) { return false; }
+	if (val < pd.lower || val > pd.upper) { return false; }
+
+	boost::shared_ptr<AutomationControl> c = pi->automation_control (Evoral::Parameter (PluginAutomation, 0, controlid));
+	c->set_value (val, PBD::Controllable::NoGroup);
+	return true;
+}
+
+float
+ARDOUR::LuaAPI::get_plugin_insert_param (boost::shared_ptr<PluginInsert> pi, uint32_t which, bool &ok)
+{
+	ok=false;
+	boost::shared_ptr<Plugin> plugin = pi->plugin ();
+	if (!plugin) { return 0; }
+	uint32_t controlid = plugin->nth_parameter (which, ok);
+	if (!ok) { return 0; }
+	return plugin->get_parameter ( controlid );
+}
+
+bool
+ARDOUR::LuaAPI::set_processor_param (boost::shared_ptr<Processor> proc, uint32_t which, float val)
+{
+	boost::shared_ptr<PluginInsert> pi = boost::dynamic_pointer_cast<PluginInsert> (proc);
+	if (!pi) { return false; }
+	return set_plugin_insert_param (pi, which, val);
+}
+
+float
+ARDOUR::LuaAPI::get_processor_param (boost::shared_ptr<Processor> proc, uint32_t which, bool &ok)
+{
+	ok=false;
+	boost::shared_ptr<PluginInsert> pi = boost::dynamic_pointer_cast<PluginInsert> (proc);
+	if (!pi) { return false; }
+	return get_plugin_insert_param (pi, which, ok);
+}
+
+bool
+ARDOUR::LuaAPI::reset_processor_to_default ( boost::shared_ptr<Processor> proc )
+{
+	boost::shared_ptr<PluginInsert> pi = boost::dynamic_pointer_cast<PluginInsert> (proc);
+	if (pi) {
+		pi->reset_parameters_to_default();
+		return true;
+	}
+	return false;
+}
+
+int
+ARDOUR::LuaAPI::plugin_automation (lua_State *L)
+{
+	typedef boost::shared_ptr<Processor> T;
+
+	int top = lua_gettop (L);
+	if (top < 2) {
+		return luaL_argerror (L, 1, "invalid number of arguments, :plugin_automation (plugin, parameter_number)");
+	}
+	T* const p = luabridge::Userdata::get<T> (L, 1, false);
+	uint32_t which = luabridge::Stack<uint32_t>::get (L, 2);
+	if (!p) {
+		return luaL_error (L, "Invalid pointer to Ardour:Processor");
+	}
+	boost::shared_ptr<PluginInsert> pi = boost::dynamic_pointer_cast<PluginInsert> (*p);
+	if (!pi) {
+		return luaL_error (L, "Given Processor is not a Plugin Insert");
+	}
+	boost::shared_ptr<Plugin> plugin = pi->plugin ();
+	if (!plugin) {
+		return luaL_error (L, "Given Processor is not a Plugin");
+	}
+
+	bool ok=false;
+	uint32_t controlid = plugin->nth_parameter (which, ok);
+	if (!ok) {
+		return luaL_error (L, "Invalid Parameter");
+	}
+	if (!plugin->parameter_is_input (controlid)) {
+		return luaL_error (L, "Given Parameter is not an input");
+	}
+
+	ParameterDescriptor pd;
+	if (plugin->get_parameter_descriptor (controlid, pd) != 0) {
+		return luaL_error (L, "Cannot describe parameter");
+	}
+
+	boost::shared_ptr<AutomationControl> c = pi->automation_control (Evoral::Parameter (PluginAutomation, 0, controlid));
+
+	luabridge::Stack<boost::shared_ptr<AutomationList> >::push (L, c->alist ());
+	luabridge::Stack<boost::shared_ptr<Evoral::ControlList> >::push (L, c->list ());
+	luabridge::Stack<ParameterDescriptor>::push (L, pd);
+	return 3;
+}
+
+int
+ARDOUR::LuaAPI::sample_to_timecode (lua_State *L)
+{
+	int top = lua_gettop (L);
+	if (top < 3) {
+		return luaL_argerror (L, 1, "invalid number of arguments sample_to_timecode (TimecodeFormat, sample_rate, sample)");
+	}
+	typedef Timecode::TimecodeFormat T;
+	T tf = luabridge::Stack<T>::get (L, 1);
+	double sample_rate = luabridge::Stack<double>::get (L, 2);
+	int64_t sample = luabridge::Stack<int64_t>::get (L, 3);
+
+	Timecode::Time timecode;
+
+	Timecode::sample_to_timecode (
+			sample, timecode, false, false,
+			Timecode::timecode_to_frames_per_second (tf),
+			Timecode::timecode_has_drop_frames (tf),
+			sample_rate,
+			0, false, 0);
+
+	luabridge::Stack<uint32_t>::push (L, timecode.hours);
+	luabridge::Stack<uint32_t>::push (L, timecode.minutes);
+	luabridge::Stack<uint32_t>::push (L, timecode.seconds);
+	luabridge::Stack<uint32_t>::push (L, timecode.frames);
+	return 4;
+}
+
+int
+ARDOUR::LuaAPI::timecode_to_sample (lua_State *L)
+{
+	int top = lua_gettop (L);
+	if (top < 6) {
+		return luaL_argerror (L, 1, "invalid number of arguments sample_to_timecode (TimecodeFormat, sample_rate, hh, mm, ss, ff)");
+	}
+	typedef Timecode::TimecodeFormat T;
+	T tf = luabridge::Stack<T>::get (L, 1);
+	double sample_rate = luabridge::Stack<double>::get (L, 2);
+	int hh = luabridge::Stack<int>::get (L, 3);
+	int mm = luabridge::Stack<int>::get (L, 4);
+	int ss = luabridge::Stack<int>::get (L, 5);
+	int ff = luabridge::Stack<int>::get (L, 6);
+
+	Timecode::Time timecode;
+	timecode.negative = false;
+	timecode.hours = hh;
+	timecode.minutes = mm;
+	timecode.seconds = ss;
+	timecode.frames = ff;
+	timecode.subframes = 0;
+	timecode.rate = Timecode::timecode_to_frames_per_second (tf);
+	timecode.drop = Timecode::timecode_has_drop_frames (tf);
+
+	int64_t sample;
+
+	Timecode::timecode_to_sample (
+			timecode, sample, false, false,
+			sample_rate, 0, false, 0);
+
+	luabridge::Stack<int64_t>::push (L, sample);
+	return 1;
+}
+
+int
+ARDOUR::LuaAPI::sample_to_timecode_lua (lua_State *L)
+{
+	int top = lua_gettop (L);
+	if (top < 2) {
+		return luaL_argerror (L, 1, "invalid number of arguments sample_to_timecode (sample)");
+	}
+	Session const* const s = luabridge::Userdata::get <Session> (L, 1, true);
+	int64_t sample = luabridge::Stack<int64_t>::get (L, 2);
+
+	Timecode::Time timecode;
+
+	Timecode::sample_to_timecode (
+			sample, timecode, false, false,
+			s->timecode_frames_per_second (),
+			s->timecode_drop_frames (),
+			s->sample_rate (),
+			0, false, 0);
+
+	luabridge::Stack<uint32_t>::push (L, timecode.hours);
+	luabridge::Stack<uint32_t>::push (L, timecode.minutes);
+	luabridge::Stack<uint32_t>::push (L, timecode.seconds);
+	luabridge::Stack<uint32_t>::push (L, timecode.frames);
+	return 4;
+}
+int
+ARDOUR::LuaAPI::timecode_to_sample_lua (lua_State *L)
+{
+	int top = lua_gettop (L);
+	if (top < 5) {
+		return luaL_argerror (L, 1, "invalid number of arguments sample_to_timecode (hh, mm, ss, ff)");
+	}
+	Session const* const s = luabridge::Userdata::get <Session> (L, 1, true);
+	int hh = luabridge::Stack<int>::get (L, 2);
+	int mm = luabridge::Stack<int>::get (L, 3);
+	int ss = luabridge::Stack<int>::get (L, 4);
+	int ff = luabridge::Stack<int>::get (L, 5);
+
+	Timecode::Time timecode;
+	timecode.negative = false;
+	timecode.hours = hh;
+	timecode.minutes = mm;
+	timecode.seconds = ss;
+	timecode.frames = ff;
+	timecode.subframes = 0;
+	timecode.rate = s->timecode_frames_per_second ();
+	timecode.drop = s->timecode_drop_frames ();
+
+	int64_t sample;
+
+	Timecode::timecode_to_sample (
+			timecode, sample, false, false,
+			s->sample_rate (),
+			0, false, 0);
+
+	luabridge::Stack<int64_t>::push (L, sample);
+	return 1;
+}
+
+int
+ARDOUR::LuaOSC::Address::send (lua_State *L)
+{
+	Address * const luaosc = luabridge::Userdata::get <Address> (L, 1, false);
+	if (!luaosc) {
+		return luaL_error (L, "Invalid pointer to OSC.Address");
+	}
+	if (!luaosc->_addr) {
+		return luaL_error (L, "Invalid Destination Address");
+	}
+
+	int top = lua_gettop (L);
+	if (top < 3) {
+		return luaL_argerror (L, 1, "invalid number of arguments, :send (path, type, ...)");
+	}
+
+	const char* path = luaL_checkstring (L, 2);
+	const char* type = luaL_checkstring (L, 3);
+	assert (path && type);
+
+	if ((int) strlen (type) != top - 3) {
+		return luaL_argerror (L, 3, "type description does not match arguments");
+	}
+
+	lo_message msg = lo_message_new ();
+
+	for (int i = 4; i <= top; ++i) {
+		char t = type[i - 4];
+		int lt = lua_type (L, i);
+		int ok = -1;
+		switch (lt) {
+			case LUA_TSTRING:
+				if (t == LO_STRING) {
+					ok = lo_message_add_string (msg, luaL_checkstring (L, i));
+				} else if (t == LO_CHAR) {
+					char c = luaL_checkstring (L, i) [0];
+					ok = lo_message_add_char (msg, c);
+				}
+				break;
+			case LUA_TBOOLEAN:
+				if (t == LO_TRUE || t == LO_FALSE) {
+					if (lua_toboolean (L, i)) {
+						ok = lo_message_add_true (msg);
+					} else {
+						ok = lo_message_add_false (msg);
+					}
+				}
+				break;
+			case LUA_TNUMBER:
+				if (t == LO_INT32) {
+					ok = lo_message_add_int32 (msg, (int32_t) luaL_checkinteger (L, i));
+				}
+				else if (t == LO_FLOAT) {
+					ok = lo_message_add_float (msg, (float) luaL_checknumber (L, i));
+				}
+				else if (t == LO_DOUBLE) {
+					ok = lo_message_add_double (msg, (double) luaL_checknumber (L, i));
+				}
+				else if (t == LO_INT64) {
+					ok = lo_message_add_double (msg, (int64_t) luaL_checknumber (L, i));
+				}
+				break;
+			default:
+				break;
+		}
+		if (ok != 0) {
+			return luaL_argerror (L, i, "type description does not match parameter");
+		}
+	}
+
+	int rv = lo_send_message (luaosc->_addr, path, msg);
+	lo_message_free (msg);
+	luabridge::Stack<bool>::push (L, (rv == 0));
+	return 1;
+}
+
+static double hue2rgb (const double p, const double q, double t) {
+	if (t < 0.0) t += 1.0;
+	if (t > 1.0) t -= 1.0;
+	if (t < 1.0 / 6.0) return p + (q - p) * 6.0 * t;
+	if (t < 1.0 / 2.0) return q;
+	if (t < 2.0 / 3.0) return p + (q - p) * (2.0 / 3.0 - t) * 6.0;
+	return p;
+}
+
+int
+ARDOUR::LuaAPI::hsla_to_rgba (lua_State *L)
+{
+	int top = lua_gettop (L);
+	if (top < 3) {
+		return luaL_argerror (L, 1, "invalid number of arguments, :hsla_to_rgba (h, s, l [,a])");
+	}
+	double h = luabridge::Stack<double>::get (L, 1);
+	double s = luabridge::Stack<double>::get (L, 2);
+	double l = luabridge::Stack<double>::get (L, 3);
+	double a = 1.0;
+	if (top > 3) {
+		a = luabridge::Stack<double>::get (L, 4);
+	}
+
+	// we can't use Gtkmm2ext::hsva_to_color here
+	// besides we want HSL not HSV and without intermediate
+	// color_to_rgba (rgba_to_color ())
+	double r, g, b;
+	const double cq = l < 0.5 ? l * (1 + s) : l + s - l * s;
+	const double cp = 2.f * l - cq;
+	r = hue2rgb (cp, cq, h + 1.0 / 3.0);
+	g = hue2rgb (cp, cq, h);
+	b = hue2rgb (cp, cq, h - 1.0 / 3.0);
+
+	luabridge::Stack<double>::push (L, r);
+	luabridge::Stack<double>::push (L, g);
+	luabridge::Stack<double>::push (L, b);
+	luabridge::Stack<double>::push (L, a);
+	return 4;
+}
+
+int
+ARDOUR::LuaAPI::color_to_rgba (lua_State *L)
+{
+	int top = lua_gettop (L);
+	if (top < 1) {
+		return luaL_argerror (L, 1, "invalid number of arguments, color_to_rgba (uint32_t)");
+	}
+	uint32_t color = luabridge::Stack<uint32_t>::get (L, 1);
+	double r, g, b, a;
+
+	/* libardour is no user of libcanvas, otherwise
+	 * we could just call
+	 * Gtkmm2ext::color_to_rgba (color, r, g, b, a);
+	 */
+	r = ((color >> 24) & 0xff) / 255.0;
+	g = ((color >> 16) & 0xff) / 255.0;
+	b = ((color >>  8) & 0xff) / 255.0;
+	a = ((color >>  0) & 0xff) / 255.0;
+
+	luabridge::Stack <double>::push (L, r);
+	luabridge::Stack <double>::push (L, g);
+	luabridge::Stack <double>::push (L, b);
+	luabridge::Stack <double>::push (L, a);
+	return 4;
+}
+
+int
+ARDOUR::LuaAPI::build_filename (lua_State *L)
+{
+	std::vector<std::string> elem;
+	int top = lua_gettop (L);
+	if (top < 1) {
+		return luaL_argerror (L, 1, "invalid number of arguments, build_filename (path, ...)");
+	}
+	for (int i = 1; i <= top; ++i) {
+		int lt = lua_type (L, i);
+		if (lt != LUA_TSTRING) {
+			return luaL_argerror (L, i, "invalid argument type, expected string");
+		}
+		elem.push_back (luaL_checkstring (L, i));
+	}
+
+	luabridge::Stack<std::string>::push (L, Glib::build_filename (elem));
+	return 1;
+}
+
+luabridge::LuaRef::Proxy&
+luabridge::LuaRef::Proxy::clone_instance (const void* classkey, void* p) {
+	lua_rawgeti (m_L, LUA_REGISTRYINDEX, m_tableRef);
+	lua_rawgeti (m_L, LUA_REGISTRYINDEX, m_keyRef);
+
+	luabridge::UserdataPtr::push_raw (m_L, p, classkey);
+
+	lua_rawset (m_L, -3);
+	lua_pop (m_L, 1);
+	return *this;
+}
+
+LuaTableRef::LuaTableRef () {}
+LuaTableRef::~LuaTableRef () {}
+
+int
+LuaTableRef::get (lua_State* L)
+{
+	luabridge::LuaRef rv (luabridge::newTable (L));
+	for (std::vector<LuaTableEntry>::const_iterator i = _data.begin (); i != _data.end (); ++i) {
+		switch ((*i).keytype) {
+			case LUA_TSTRING:
+				assign (&rv, i->k_s, *i);
+				break;
+			case LUA_TNUMBER:
+				assign (&rv, i->k_n, *i);
+				break;
+		}
+	}
+	luabridge::push (L, rv);
+	return 1;
+}
+
+int
+LuaTableRef::set (lua_State* L)
+{
+	if (!lua_istable (L, -1)) { return luaL_error (L, "argument is not a table"); }
+	_data.clear ();
+
+	lua_pushvalue (L, -1);
+	lua_pushnil (L);
+	while (lua_next (L, -2)) {
+		lua_pushvalue (L, -2);
+
+		LuaTableEntry s (lua_type (L, -1), lua_type (L, -2));
+		switch (lua_type (L, -1)) {
+			case LUA_TSTRING:
+				s.k_s = luabridge::Stack<std::string>::get (L, -1);
+				break;
+				;
+			case LUA_TNUMBER:
+				s.k_n = luabridge::Stack<unsigned int>::get (L, -1);
+				break;
+			default:
+				// invalid key
+				lua_pop (L, 2);
+				continue;
+		}
+
+		switch (lua_type (L, -2)) {
+			case LUA_TSTRING:
+				s.s = luabridge::Stack<std::string>::get (L, -2);
+				break;
+			case LUA_TBOOLEAN:
+				s.b = lua_toboolean (L, -2);
+				break;
+			case LUA_TNUMBER:
+				s.n = lua_tonumber (L, -2);
+				break;
+			case LUA_TUSERDATA:
+				{
+					bool ok = false;
+					lua_getmetatable (L, -2);
+					lua_rawgetp (L, -1, luabridge::getIdentityKey ());
+					if (lua_isboolean (L, -1)) {
+						lua_pop (L, 1);
+						const void* key = lua_topointer (L, -1);
+						lua_pop (L, 1);
+						void const* classkey = findclasskey (L, key);
+
+						if (classkey) {
+							ok = true;
+							s.c = classkey;
+							s.p = luabridge::Userdata::get_ptr (L, -2);
+						}
+					} else {
+						lua_pop (L, 2);
+					}
+
+					if (ok) {
+						break;
+					}
+					// invalid userdata -- fall through
+				}
+				// no break
+			case LUA_TFUNCTION: // no support -- we could... string.format("%q", string.dump(value, true))
+			case LUA_TTABLE: // no nested tables, sorry.
+			case LUA_TNIL: // fallthrough
+			default:
+				// invalid value
+				lua_pop (L, 2);
+				continue;
+		}
+
+		_data.push_back (s);
+		lua_pop (L, 2);
+	}
+	return 0;
+}
+
+void*
+LuaTableRef::findclasskey (lua_State *L, const void* key)
+{
+	lua_pushvalue (L, LUA_REGISTRYINDEX);
+	lua_pushnil (L);
+	while (lua_next (L, -2)) {
+		lua_pushvalue (L, -2);
+		if (lua_topointer (L, -2) == key) {
+			void* rv = lua_touserdata (L, -1);
+			lua_pop (L, 4);
+			return rv;
+		}
+		lua_pop (L, 2);
+	}
+	lua_pop (L, 1);
+	return NULL;
+}
+
+template<typename T>
+void LuaTableRef::assign (luabridge::LuaRef* rv, T key, const LuaTableEntry& s)
+{
+	switch (s.valuetype) {
+		case LUA_TSTRING:
+			(*rv)[key] = s.s;
+			break;
+		case LUA_TBOOLEAN:
+			(*rv)[key] = s.b;
+			break;
+		case LUA_TNUMBER:
+			(*rv)[key] = s.n;
+			break;
+		case LUA_TUSERDATA:
+			(*rv)[key].clone_instance (s.c, s.p);
+			break;
+		default:
+			assert (0);
+			break;
+	}
+}
+
+std::vector<std::string>
+LuaAPI::Vamp::list_plugins ()
+{
+	using namespace ::Vamp::HostExt;
+	PluginLoader* loader (PluginLoader::getInstance());
+	return loader->listPlugins ();
+}
+
+LuaAPI::Vamp::Vamp (const std::string& key, float sample_rate)
+	: _plugin (0)
+	, _sample_rate (sample_rate)
+	, _bufsize (1024)
+	, _stepsize (1024)
+	, _initialized (false)
+{
+	using namespace ::Vamp::HostExt;
+
+	PluginLoader* loader (PluginLoader::getInstance());
+	_plugin = loader->loadPlugin (key, _sample_rate, PluginLoader::ADAPT_ALL_SAFE);
+
+	if (!_plugin) {
+		PBD::error << string_compose (_("VAMP Plugin \"%1\" could not be loaded"), key) << endmsg;
+		throw failed_constructor ();
+	}
+
+	size_t bs = _plugin->getPreferredBlockSize ();
+	size_t ss = _plugin->getPreferredStepSize ();
+
+	if (bs > 0 && ss > 0 && bs <= 8192 && ss <= 8192) {
+		_bufsize = bs;
+		_stepsize = ss;
+	}
+}
+
+LuaAPI::Vamp::~Vamp ()
+{
+	delete _plugin;
+}
+
+void
+LuaAPI::Vamp::reset ()
+{
+	_initialized = false;
+	if (_plugin) {
+		_plugin->reset ();
+	}
+}
+
+bool
+LuaAPI::Vamp::initialize ()
+{
+	if (!_plugin || _plugin->getMinChannelCount() > 1) {
+		return false;
+	}
+	if (!_plugin->initialise (1, _stepsize, _bufsize)) {
+		return false;
+	}
+	_initialized = true;
+	return true;
+}
+
+int
+LuaAPI::Vamp::analyze (boost::shared_ptr<ARDOUR::Readable> r, uint32_t channel, luabridge::LuaRef cb)
+{
+	if (!_initialized) {
+		if (!initialize ()) {
+			return -1;
+		}
+	}
+	assert (_initialized);
+
+	::Vamp::Plugin::FeatureSet features;
+	float* data = new float[_bufsize];
+	float* bufs[1] = { data };
+
+	samplecnt_t len = r->readable_length();
+	samplepos_t pos = 0;
+
+	int rv = 0;
+	while (1) {
+		samplecnt_t to_read = std::min ((len - pos), _bufsize);
+		if (r->read (data, pos, to_read, channel) != to_read) {
+			rv = -1;
+			break;
+		}
+		if (to_read != _bufsize) {
+			memset (data + to_read, 0, (_bufsize - to_read) * sizeof (float));
+		}
+
+		features = _plugin->process (bufs, ::Vamp::RealTime::fromSeconds ((double) pos / _sample_rate));
+
+		if (cb.type () == LUA_TFUNCTION) {
+			cb (&features, pos);
+		}
+
+		pos += std::min (_stepsize, to_read);
+
+		if (pos >= len) {
+			break;
+		}
+	}
+
+	delete [] data;
+	return rv;
+}
+
+::Vamp::Plugin::FeatureSet
+LuaAPI::Vamp::process (const std::vector<float*>& d, ::Vamp::RealTime rt)
+{
+	if (!_plugin || d.size() == 0) {
+		return ::Vamp::Plugin::FeatureSet ();
+	}
+	const float* const* bufs = &d[0];
+	return _plugin->process (bufs, rt);
+}
+
+boost::shared_ptr<Evoral::Note<Temporal::Beats> >
+LuaAPI::new_noteptr (uint8_t chan, Temporal::Beats beat_time, Temporal::Beats length, uint8_t note, uint8_t velocity)
+{
+	return boost::shared_ptr<Evoral::Note<Temporal::Beats> > (new Evoral::Note<Temporal::Beats>(chan, beat_time, length, note, velocity));
+}
+
+std::list<boost::shared_ptr<Evoral::Note<Temporal::Beats> > >
+LuaAPI::note_list (boost::shared_ptr<MidiModel> mm)
+{
+	typedef boost::shared_ptr<Evoral::Note<Temporal::Beats> > NotePtr;
+
+	std::list<NotePtr> note_ptr_list;
+
+	const MidiModel::Notes& notes = mm->notes();
+	for (MidiModel::Notes::const_iterator i = notes.begin(); i != notes.end(); ++i) {
+		note_ptr_list.push_back (*i);
+	}
+	return note_ptr_list;
+}