- lua_State* L = lua.getState ();
- luabridge::LuaRef lua_dsp_configure = luabridge::getGlobal (L, "dsp_configure");
- if (lua_dsp_configure.type () == LUA_TFUNCTION) {
- try {
- lua_dsp_configure (&in, &out);
- } catch (luabridge::LuaException const& e) {
- return false;
+ if (in != _configured_in || out != _configured_out || !_configured) {
+ lua_State* L = lua.getState ();
+ luabridge::LuaRef lua_dsp_configure = luabridge::getGlobal (L, "dsp_configure");
+ if (lua_dsp_configure.type () == LUA_TFUNCTION) {
+ try {
+ luabridge::LuaRef io = lua_dsp_configure (&in, &out);
+ if (io.isTable ()) {
+ ChanCount lin (_selected_in);
+ ChanCount lout (_selected_out);
+
+ if (io["audio_in"].type() == LUA_TNUMBER) {
+ const int c = io["audio_in"].cast<int> ();
+ if (c >= 0) {
+ lin.set (DataType::AUDIO, c);
+ }
+ }
+ if (io["audio_out"].type() == LUA_TNUMBER) {
+ const int c = io["audio_out"].cast<int> ();
+ if (c >= 0) {
+ lout.set (DataType::AUDIO, c);
+ }
+ }
+ if (io["midi_in"].type() == LUA_TNUMBER) {
+ const int c = io["midi_in"].cast<int> ();
+ if (c >= 0) {
+ lin.set (DataType::MIDI, c);
+ }
+ }
+ if (io["midi_out"].type() == LUA_TNUMBER) {
+ const int c = io["midi_out"].cast<int> ();
+ if (c >= 0) {
+ lout.set (DataType::MIDI, c);
+ }
+ }
+ _info->n_inputs = lin;
+ _info->n_outputs = lout;
+ }
+ _configured = true;
+ } catch (luabridge::LuaException const& e) {
+ PBD::error << "LuaException: " << e.what () << "\n";
+#ifndef NDEBUG
+ std::cerr << "LuaException: " << e.what () << "\n";
+#endif
+ return false;
+ } catch (...) {
+ return false;
+ }