diff options
Diffstat (limited to 'libs/ardour/luaproc.cc')
-rw-r--r-- | libs/ardour/luaproc.cc | 897 |
1 files changed, 897 insertions, 0 deletions
diff --git a/libs/ardour/luaproc.cc b/libs/ardour/luaproc.cc new file mode 100644 index 0000000000..09e1cd652e --- /dev/null +++ b/libs/ardour/luaproc.cc @@ -0,0 +1,897 @@ +/* + Copyright (C) 2016 Robin Gareus <robin@gareus.org> + Copyright (C) 2006 Paul Davis + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include <glib.h> +#include "pbd/gstdio_compat.h" + +#include "pbd/pthread_utils.h" + +#include "ardour/audio_buffer.h" +#include "ardour/buffer_set.h" +#include "ardour/luabindings.h" +#include "ardour/luaproc.h" +#include "ardour/luascripting.h" +#include "ardour/midi_buffer.h" +#include "ardour/plugin.h" +#include "ardour/session.h" + +#include "i18n.h" + +using namespace ARDOUR; +using namespace PBD; + +LuaProc::LuaProc (AudioEngine& engine, + Session& session, + const std::string &script) + : Plugin (engine, session) + , _mempool ("LuaProc", 1048576) // 1 MB is plenty. (64K would be enough) + , lua (lua_newstate (&PBD::ReallocPool::lalloc, &_mempool)) + , _lua_dsp (0) + , _lua_params (0) + , _script (script) + , _lua_does_channelmapping (false) + , _control_data (0) + , _shadow_data (0) + , _has_midi_input (false) + , _has_midi_output (false) +{ + init (); + + /* when loading a session, or pasing a processor, + * the script is set during set_state(); + */ + if (!_script.empty () && load_script ()) { + throw failed_constructor (); + } +} + +LuaProc::LuaProc (const LuaProc &other) + : Plugin (other) + , _mempool ("LuaProc", 1048576) // 1 MB is plenty. (64K would be enough) + , lua (lua_newstate (&PBD::ReallocPool::lalloc, &_mempool)) + , _lua_dsp (0) + , _lua_params (0) + , _script (other.script ()) + , _lua_does_channelmapping (false) + , _control_data (0) + , _shadow_data (0) + , _has_midi_input (false) + , _has_midi_output (false) +{ + init (); + + if (load_script ()) { + throw failed_constructor (); + } + + for (uint32_t i = 0; i < parameter_count (); ++i) { + _control_data[i] = other._shadow_data[i]; + _shadow_data[i] = other._shadow_data[i]; + } +} + +LuaProc::~LuaProc () { +#ifdef WITH_LUAPROC_STATS + if (_info && _stats_cnt > 0) { + printf ("LuaProc: '%s' run() avg: %.3f max: %.3f [ms]\n", + _info->name.c_str (), + 0.0001f * _stats_avg[0] / (float) _stats_cnt, + 0.0001f * _stats_max[0]); + printf ("LuaProc: '%s' gc() avg: %.3f max: %.3f [ms]\n", + _info->name.c_str (), + 0.0001f * _stats_avg[1] / (float) _stats_cnt, + 0.0001f * _stats_max[1]); + } +#endif + lua.do_command ("collectgarbage();"); + delete (_lua_dsp); + delete (_lua_params); + delete [] _control_data; + delete [] _shadow_data; +} + +void +LuaProc::init () +{ +#ifdef WITH_LUAPROC_STATS + _stats_avg[0] = _stats_avg[1] = _stats_max[0] = _stats_max[1] = _stats_cnt = 0; +#endif + +#ifndef NDEBUG + lua.Print.connect (sigc::mem_fun (*this, &LuaProc::lua_print)); +#endif + // register session object + lua_State* L = lua.getState (); + LuaBindings::stddef (L); + LuaBindings::common (L); + LuaBindings::dsp (L); + + // add session to global lua namespace + luabridge::push <Session *> (L, &_session); + lua_setglobal (L, "Session"); + + // sandbox + lua.do_command ("io = nil os = nil loadfile = nil require = nil dofile = nil package = nil debug = nil"); +#if 0 + lua.do_command ("for n in pairs(_G) do print(n) end print ('----')"); // print global env +#endif + lua.do_command ("function ardour () end"); +} + +void +LuaProc::lua_print (std::string s) { + std::cout <<"LuaProc: " << s << "\n"; +} + +bool +LuaProc::load_script () +{ + assert (!_lua_dsp); // don't allow to re-initialize + + // TODO: refine APIs; function arguments.. + // - perform channel-map in ardour (silent/scratch buffers) ? + // - control-port API (explicit get/set functions ??) + // - latency reporting (global var? ctrl-port? set-function ?) + // - MIDI -> sparse table of events + // { [sample] => { Event }, .. } + // or { { sample, Event }, .. } + + try { + LuaScriptInfoPtr lsi = LuaScripting::script_info (_script); + LuaPluginInfoPtr lpi (new LuaPluginInfo (lsi)); + assert (lpi); + set_info (lpi); + _mempool.set_name ("LuaProc: " + lsi->name); + _docs = lsi->description; + } catch (failed_constructor& err) { + return true; + } + + lua_State* L = lua.getState (); + lua.do_command (_script); + + // check if script has a DSP callback + luabridge::LuaRef lua_dsp_run = luabridge::getGlobal (L, "dsp_run"); + luabridge::LuaRef lua_dsp_map = luabridge::getGlobal (L, "dsp_runmap"); + + if ((lua_dsp_run.type () != LUA_TFUNCTION) == (lua_dsp_map.type () != LUA_TFUNCTION)) { + return true; + } + + if (lua_dsp_run.type () == LUA_TFUNCTION) { + _lua_dsp = new luabridge::LuaRef (lua_dsp_run); + } + else if (lua_dsp_map.type () == LUA_TFUNCTION) { + _lua_dsp = new luabridge::LuaRef (lua_dsp_map); + _lua_does_channelmapping = true; + } + else { + assert (0); + } + + // initialize the DSP if needed + luabridge::LuaRef lua_dsp_init = luabridge::getGlobal (L, "dsp_init"); + if (lua_dsp_init.type () == LUA_TFUNCTION) { + try { + lua_dsp_init (_session.nominal_frame_rate ()); + } catch (luabridge::LuaException const& e) { + ; + } + } + + luabridge::LuaRef lua_dsp_midi_in = luabridge::getGlobal (L, "dsp_midi_input"); + if (lua_dsp_midi_in.type () == LUA_TFUNCTION) { + try { + _has_midi_input = lua_dsp_midi_in (); + } catch (luabridge::LuaException const& e) { + ; + } + } + + _ctrl_params.clear (); + + luabridge::LuaRef lua_params = luabridge::getGlobal (L, "dsp_params"); + if (lua_params.isFunction ()) { + + // call function // add try {} catch (luabridge::LuaException const& e) + luabridge::LuaRef params = lua_params (); + + if (params.isTable ()) { + + _lua_params = new luabridge::LuaRef (params); + + for (luabridge::Iterator i (params); !i.isNil (); ++i) { + // required fields + if (!i.key ().isNumber ()) { return false; } + if (!i.value ().isTable ()) { return false; } + if (!i.value ()["type"].isString ()) { return false; } + if (!i.value ()["name"].isString ()) { return false; } + if (!i.value ()["min"].isNumber ()) { return false; } + if (!i.value ()["max"].isNumber ()) { return false; } + + std::string type = i.value ()["type"].cast<std::string> (); + if (type == "input") { + if (!i.value ()["default"].isNumber ()) { return false; } + _ctrl_params.push_back (std::make_pair (false, i.key ().cast<int> ())); + } + else if (type == "output") { + _ctrl_params.push_back (std::make_pair (true, i.key ().cast<int> ())); + } else { + return false; + } + assert (i.key ().cast<int> () == (int) _ctrl_params.size ()); + } + } + } + + _control_data = new float[parameter_count ()]; + _shadow_data = new float[parameter_count ()]; + + for (uint32_t i = 0; i < parameter_count (); ++i) { + if (parameter_is_input (i)) { + _control_data[i] = _shadow_data[i] = default_value (i); + } + } + + // expose ctrl-ports to global lua namespace + luabridge::push <float *> (L, _control_data); + lua_setglobal (L, "CtrlPorts"); + + return false; // no error +} + +bool +LuaProc::can_support_io_configuration (const ChanCount& in, ChanCount& out) +{ + if (in.n_midi() > 0 && !_has_midi_input) { + return false; + } + + lua_State* L = lua.getState (); + luabridge::LuaRef ioconfig = luabridge::getGlobal (L, "dsp_ioconfig"); + if (!ioconfig.isFunction ()) { + return false; + } + + luabridge::LuaRef table = luabridge::getGlobal (L, "table"); //lua std lib + luabridge::LuaRef tablesort = table["sort"]; + assert (tablesort.isFunction ()); + + luabridge::LuaRef *_iotable = NULL; // can't use reference :( + try { + luabridge::LuaRef iotable = ioconfig (); + tablesort (iotable); + if (iotable.isTable ()) { + _iotable = new luabridge::LuaRef (iotable); + } + } catch (luabridge::LuaException const& e) { + return false; + } + + if (!_iotable) { + return false; + } + + // now we can reference it. + luabridge::LuaRef iotable (*_iotable); + delete _iotable; + + if ((iotable).length () < 1) { + return false; + } + + int32_t audio_in = in.n_audio (); + int32_t audio_out; + + if (in.n_midi() > 0 && audio_in == 0) { + audio_out = 2; // prefer stereo version if available. + } else { + audio_out = audio_in; + } + + for (luabridge::Iterator i (iotable); !i.isNil (); ++i) { + assert (i.value ().type () == LUA_TTABLE); + luabridge::LuaRef io (i.value ()); + + int possible_in = io["audio_in"]; + int possible_out = io["audio_out"]; + + // exact match + if ((possible_in == audio_in) && (possible_out == audio_out)) { + out.set (DataType::MIDI, 0); + out.set (DataType::AUDIO, audio_out); + return true; + } + } + + /* now allow potentially "imprecise" matches */ + audio_out = -1; + bool found = false; + + for (luabridge::Iterator i (iotable); !i.isNil (); ++i) { + assert (i.value ().type () == LUA_TTABLE); + luabridge::LuaRef io (i.value ()); + + int possible_in = io["audio_in"]; + int possible_out = io["audio_out"]; + + if (possible_out == 0) { + continue; + } + if (possible_in == 0) { + /* no inputs, generators & instruments */ + if (possible_out == -1) { + /* any configuration possible, provide stereo output */ + audio_out = 2; + found = true; + } else if (possible_out == -2) { + /* invalid, should be (0, -1) */ + audio_out = 2; + found = true; + } else if (possible_out < -2) { + /* variable number of outputs. -> whatever */ + audio_out = 2; + found = true; + } else { + /* exact number of outputs */ + audio_out = possible_out; + found = true; + } + } + + if (possible_in == -1) { + /* wildcard for input */ + if (possible_out == -1) { + /* out much match in */ + audio_out = audio_in; + found = true; + } else if (possible_out == -2) { + /* any configuration possible, pick matching */ + audio_out = audio_in; + found = true; + } else if (possible_out < -2) { + /* explicitly variable number of outputs, pick maximum */ + audio_out = -possible_out; + found = true; + } else { + /* exact number of outputs */ + audio_out = possible_out; + found = true; + } + } + + if (possible_in == -2) { + + if (possible_out == -1) { + /* any configuration possible, pick matching */ + audio_out = audio_in; + found = true; + } else if (possible_out == -2) { + /* invalid. interpret as (-1, -1) */ + audio_out = audio_in; + found = true; + } else if (possible_out < -2) { + /* explicitly variable number of outputs, pick maximum */ + audio_out = -possible_out; + found = true; + } else { + /* exact number of outputs */ + audio_out = possible_out; + found = true; + } + } + + if (possible_in < -2) { + /* explicit variable number of inputs */ + if (audio_in > -possible_in) { + /* request is too large */ + } + if (possible_out == -1) { + /* any output configuration possible, provide stereo out */ + audio_out = 2; + found = true; + } else if (possible_out == -2) { + /* invalid. interpret as (<-2, -1) */ + audio_out = 2; + found = true; + } else if (possible_out < -2) { + /* explicitly variable number of outputs, pick stereo */ + audio_out = 2; + found = true; + } else { + /* exact number of outputs */ + audio_out = possible_out; + found = true; + } + } + + if (possible_in && (possible_in == audio_in)) { + /* exact number of inputs ... must match obviously */ + if (possible_out == -1) { + /* any output configuration possible, provide stereo output */ + audio_out = 2; + found = true; + } else if (possible_out == -2) { + /* invalid. interpret as (>0, -1) */ + audio_out = 2; + found = true; + } else if (possible_out < -2) { + /* explicitly variable number of outputs, pick maximum */ + audio_out = -possible_out; + found = true; + } else { + /* exact number of outputs */ + audio_out = possible_out; + found = true; + } + } + + if (found) { + break; + } + } + + if (!found) { + return false; + } + + out.set (DataType::MIDI, 0); + out.set (DataType::AUDIO, audio_out); + return true; +} + +bool +LuaProc::configure_io (ChanCount in, ChanCount out) +{ + _configured_in = in; + _configured_out = out; + + _configured_in.set (DataType::MIDI, _has_midi_input ? 1 : 0); + _configured_out.set (DataType::MIDI, _has_midi_output ? 1 : 0); + + // configure the DSP if needed + 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) { + ; + } + } + + _info->n_inputs = _configured_in; + _info->n_outputs = _configured_out; + return true; +} + +int +LuaProc::connect_and_run (BufferSet& bufs, + ChanMapping in, ChanMapping out, + pframes_t nframes, framecnt_t offset) +{ + if (!_lua_dsp) { + return 0; + } + + Plugin::connect_and_run (bufs, in, out, nframes, offset); + + // This is needed for ARDOUR::Session requests :( + if (! SessionEvent::has_per_thread_pool ()) { + char name[64]; + snprintf (name, 64, "Proc-%p", this); + pthread_set_name (name); + SessionEvent::create_per_thread_pool (name, 64); + PBD::notify_event_loops_about_thread_creation (pthread_self(), name, 64); + } + + uint32_t const n = parameter_count (); + for (uint32_t i = 0; i < n; ++i) { + if (parameter_is_control (i) && parameter_is_input (i)) { + _control_data[i] = _shadow_data[i]; + } + } + +#ifdef WITH_LUAPROC_STATS + int64_t t0 = g_get_monotonic_time (); +#endif + + try { + if (_lua_does_channelmapping) { + // run the DSP function + (*_lua_dsp)(&bufs, in, out, nframes, offset); + } else { + // map buffers + BufferSet& silent_bufs = _session.get_silent_buffers (ChanCount (DataType::AUDIO, 1)); + BufferSet& scratch_bufs = _session.get_scratch_buffers (ChanCount (DataType::AUDIO, 1)); + + lua_State* L = lua.getState (); + luabridge::LuaRef in_map (luabridge::newTable (L)); + luabridge::LuaRef out_map (luabridge::newTable (L)); + + const uint32_t audio_in = _configured_in.n_audio (); + const uint32_t audio_out = _configured_out.n_audio (); + const uint32_t midi_in = _configured_in.n_midi (); + + for (uint32_t ap = 0; ap < audio_in; ++ap) { + bool valid; + const uint32_t buf_index = in.get(DataType::AUDIO, ap, &valid); + if (valid) { + in_map[ap + 1] = bufs.get_audio (buf_index).data (offset); + } else { + in_map[ap + 1] = silent_bufs.get_audio (0).data (offset); + } + } + for (uint32_t ap = 0; ap < audio_out; ++ap) { + bool valid; + const uint32_t buf_index = out.get(DataType::AUDIO, ap, &valid); + if (valid) { + out_map[ap + 1] = bufs.get_audio (buf_index).data (offset); + } else { + out_map[ap + 1] = scratch_bufs.get_audio (0).data (offset); + } + } + + luabridge::LuaRef lua_midi_tbl (luabridge::newTable (L)); + int e = 1; // > 1 port, we merge events (unsorted) + for (uint32_t mp = 0; mp < midi_in; ++mp) { + bool valid; + const uint32_t idx = in.get(DataType::MIDI, mp, &valid); + if (valid) { + for (MidiBuffer::iterator m = bufs.get_midi(idx).begin(); + m != bufs.get_midi(idx).end(); ++m, ++e) { + const Evoral::MIDIEvent<framepos_t> ev(*m, false); + luabridge::LuaRef lua_midi_data (luabridge::newTable (L)); + const uint8_t* data = ev.buffer(); + for (uint32_t i = 0; i < ev.size(); ++i) { + lua_midi_data [i + 1] = data[i]; + } + luabridge::LuaRef lua_midi_event (luabridge::newTable (L)); + lua_midi_event["time"] = 1 + (*m).time(); + lua_midi_event["data"] = lua_midi_data; + lua_midi_tbl[e] = lua_midi_event; + } + } + } + + if (_has_midi_input) { + // XXX TODO This needs a better solution than global namespace + luabridge::push (L, lua_midi_tbl); + lua_setglobal (L, "mididata"); + } + + + // run the DSP function + (*_lua_dsp)(in_map, out_map, nframes); + } + } catch (luabridge::LuaException const& e) { +#ifndef NDEBUG + printf ("LuaException: %s\n", e.what ()); +#endif + return -1; + } +#ifdef WITH_LUAPROC_STATS + int64_t t1 = g_get_monotonic_time (); +#endif + lua.collect_garbage (); // rt-safe, slight *regular* performance overhead +#ifdef WITH_LUAPROC_STATS + ++_stats_cnt; + int64_t t2 = g_get_monotonic_time (); + int64_t ela0 = t1 - t0; + int64_t ela1 = t2 - t1; + if (ela0 > _stats_max[0]) _stats_max[0] = ela0; + if (ela1 > _stats_max[1]) _stats_max[1] = ela1; + _stats_avg[0] += ela0; + _stats_avg[1] += ela1; +#endif + return 0; +} + + +void +LuaProc::add_state (XMLNode* root) const +{ + gchar* b64 = g_base64_encode ((const guchar*)_script.c_str (), _script.size ()); + std::string b64s (b64); + g_free (b64); + XMLNode* script_node = new XMLNode (X_("script")); + script_node->add_property (X_("lua"), LUA_VERSION); + script_node->add_content (b64s); + root->add_child_nocopy (*script_node); +} + +int +LuaProc::set_script_from_state (const XMLNode& node) +{ + XMLNode* child; + if (node.name () != state_node_name ()) { + return -1; + } + + if ((child = node.child (X_("script"))) != 0) { + for (XMLNodeList::const_iterator n = child->children ().begin (); n != child->children ().end (); ++n) { + if (!(*n)->is_content ()) { continue; } + gsize size; + guchar* buf = g_base64_decode ((*n)->content ().c_str (), &size); + _script = std::string ((const char*)buf, size); + g_free (buf); + if (load_script ()) { + PBD::error << _("Failed to load Lua script from session state.") << endmsg; +#ifndef NDEBUG + std::cerr << "Failed Lua Script: " << _script << std::endl; +#endif + _script = ""; + } + break; + } + } + if (_script.empty ()) { + PBD::error << _("Session State for LuaProcessor did not include a Lua script.") << endmsg; + return -1; + } + if (!_lua_dsp) { + PBD::error << _("Invalid/incompatible Lua script found for LuaProcessor.") << endmsg; + return -1; + } + return 0; +} + +int +LuaProc::set_state (const XMLNode& node, int version) +{ + if (_script.empty ()) { + if (set_script_from_state (node)) { + return -1; + } + } + return Plugin::set_state (node, version); +} + +uint32_t +LuaProc::parameter_count () const +{ + return _ctrl_params.size (); +} + +float +LuaProc::default_value (uint32_t port) +{ + if (_ctrl_params[port].first) { + assert (0); + return 0; + } + int lp = _ctrl_params[port].second; + luabridge::LuaRef lr = (*_lua_params)[lp]; + return (lr["default"]).cast<float> (); +} + +void +LuaProc::set_parameter (uint32_t port, float val) +{ + assert (port < parameter_count ()); + if (get_parameter (port) == val) { + return; + } + _shadow_data[port] = val; + Plugin::set_parameter (port, val); +} + +float +LuaProc::get_parameter (uint32_t port) const +{ + if (parameter_is_input (port)) { + return _shadow_data[port]; + } else { + return _control_data[port]; + } +} + +int +LuaProc::get_parameter_descriptor (uint32_t port, ParameterDescriptor& desc) const +{ + assert (port <= parameter_count ()); + int lp = _ctrl_params[port].second; + + luabridge::LuaRef lr = (*_lua_params)[lp]; + desc.lower = (lr["min"]).cast<float> (); + desc.upper = (lr["max"]).cast<float> (); + + if (_ctrl_params[port].first) { + desc.normal = desc.lower; // output-port, no default + } else { + desc.normal = (lr["default"]).cast<float> (); + } + + desc.toggled = lr["toggled"].isBoolean () && (lr["toggled"]).cast<bool> (); + desc.logarithmic = lr["logarithmic"].isBoolean () && (lr["logarithmic"]).cast<bool> (); + desc.integer_step = lr["integer"].isBoolean () && (lr["integer"]).cast<bool> (); + desc.sr_dependent = lr["ratemult"].isBoolean () && (lr["ratemult"]).cast<bool> (); + desc.enumeration = lr["enum"].isBoolean () && (lr["enum"]).cast<bool> (); + + // TODO check if assignments make sense, e.g + assert (!(desc.toggled && desc.logarithmic)); + + if (lr["unit"].isString ()) { + std::string unit = lr["unit"].cast<std::string> (); + if (unit == "dB") { desc.unit = ParameterDescriptor::DB; } + else if (unit == "Hz") { desc.unit = ParameterDescriptor::HZ; } + else if (unit == "Midi Note") { desc.unit = ParameterDescriptor::MIDI_NOTE; } + } + + desc.label = (lr["name"]).cast<std::string> (); + desc.scale_points = get_scale_points (port); + desc.update_steps (); + return 0; +} + +std::string +LuaProc::get_parameter_docs (uint32_t port) const { + assert (port <= parameter_count ()); + int lp = _ctrl_params[port].second; + luabridge::LuaRef lr = (*_lua_params)[lp]; + luabridge::LuaRef doc = lr["doc"]; + if (doc.isString ()) { + return doc.cast<std::string> (); + } + return ""; +} + +uint32_t +LuaProc::nth_parameter (uint32_t port, bool& ok) const +{ + if (port < _ctrl_params.size ()) { + ok = true; + return port; + } + ok = false; + return 0; +} + +bool +LuaProc::parameter_is_input (uint32_t port) const +{ + assert (port < _ctrl_params.size ()); + return (!_ctrl_params[port].first); +} + +bool +LuaProc::parameter_is_output (uint32_t port) const +{ + assert (port < _ctrl_params.size ()); + return (_ctrl_params[port].first); +} + +std::set<Evoral::Parameter> +LuaProc::automatable () const +{ + std::set<Evoral::Parameter> automatables; + for (uint32_t i = 0; i < _ctrl_params.size (); ++i) { + if (parameter_is_input (i)) { + automatables.insert (automatables.end (), Evoral::Parameter (PluginAutomation, 0, i)); + } + } + return automatables; +} + +std::string +LuaProc::describe_parameter (Evoral::Parameter param) +{ + if (param.type () == PluginAutomation && param.id () < parameter_count ()) { + int lp = _ctrl_params[param.id ()].second; + luabridge::LuaRef lr = (*_lua_params)[lp]; + return (lr["name"]).cast<std::string> (); + } else { + return "??"; + } +} + +void +LuaProc::print_parameter (uint32_t param, char* buf, uint32_t len) const +{ + if (buf && len) { + if (param < parameter_count ()) { + snprintf (buf, len, "%.3f", get_parameter (param)); + } else { + strcat (buf, "0"); + } + } +} + +boost::shared_ptr<ScalePoints> +LuaProc::get_scale_points (uint32_t port) const +{ + int lp = _ctrl_params[port].second; + luabridge::LuaRef lr = (*_lua_params)[lp]; + + if (!lr["scalepoints"].isTable()) { + return boost::shared_ptr<ScalePoints> (); + } + + int cnt = 0; + boost::shared_ptr<ScalePoints> rv = boost::shared_ptr<ScalePoints>(new ScalePoints()); + luabridge::LuaRef scalepoints (lr["scalepoints"]); + + for (luabridge::Iterator i (scalepoints); !i.isNil (); ++i) { + if (!i.key ().isString ()) { continue; } + if (!i.value ().isNumber ()) { continue; } + rv->insert(make_pair(i.key ().cast<std::string> (), + i.value ().cast<float> ())); + ++cnt; + } + + if (rv->size() > 0) { + return rv; + } + return boost::shared_ptr<ScalePoints> (); +} + + +//////////////////////////////////////////////////////////////////////////////// +#include <glibmm/miscutils.h> +#include <glibmm/fileutils.h> + +LuaPluginInfo::LuaPluginInfo (LuaScriptInfoPtr lsi) { + if (lsi->type != LuaScriptInfo::DSP) { + throw failed_constructor (); + } + + path = lsi->path; + name = lsi->name; + creator = lsi->author; + category = lsi->category; + unique_id = "luascript"; // the interpreter is not unique. + + n_inputs.set (DataType::AUDIO, 1); + n_outputs.set (DataType::AUDIO, 1); + type = Lua; +} + +PluginPtr +LuaPluginInfo::load (Session& session) +{ + std::string script = ""; + if (!Glib::file_test (path, Glib::FILE_TEST_EXISTS)) { + return PluginPtr (); + } + + try { + script = Glib::file_get_contents (path); + } catch (Glib::FileError err) { + return PluginPtr (); + } + + if (script.empty ()) { + return PluginPtr (); + } + + try { + PluginPtr plugin (new LuaProc (session.engine (), session, script)); + return plugin; + } catch (failed_constructor& err) { + ; + } + return PluginPtr (); +} + +std::vector<Plugin::PresetRecord> +LuaPluginInfo::get_presets (bool /*user_only*/) const +{ + std::vector<Plugin::PresetRecord> p; + return p; +} |