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lv2_plugin.h

/*
    Copyright (C) 2008 Paul Davis
    Author: Dave Robillard

    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.

*/

#ifndef __ardour_lv2_plugin_h__
#define __ardour_lv2_plugin_h__

#include <set>
#include <vector>
#include <string>
#include <dlfcn.h>

#include <sigc++/signal.h>

#include <pbd/stateful.h> 

#include <jack/types.h>
#include <slv2/slv2.h>
#include <ardour/plugin.h>

namespace ARDOUR {
class AudioEngine;
class Session;
struct LV2World;

class LV2Plugin : public ARDOUR::Plugin
{
  public:
      LV2Plugin (ARDOUR::AudioEngine&, ARDOUR::Session&, ARDOUR::LV2World&, SLV2Plugin plugin, nframes_t sample_rate);
      LV2Plugin (const LV2Plugin &);
      ~LV2Plugin ();

      /* Plugin interface */
      
      std::string unique_id() const;
      const char* label() const           { return slv2_value_as_string(_name); }
      const char* name() const            { return slv2_value_as_string(_name); }
      const char* maker() const           { return _author ? slv2_value_as_string(_author) : "Unknown"; }
      uint32_t    parameter_count() const { return slv2_plugin_get_num_ports(_plugin); }
      float       default_value (uint32_t port);
      nframes_t   latency() const;
      void        set_parameter (uint32_t port, float val);
      float       get_parameter (uint32_t port) const;
      int         get_parameter_descriptor (uint32_t which, ParameterDescriptor&) const;
      uint32_t    nth_parameter (uint32_t port, bool& ok) const;

      const void* extension_data(const char* uri) { return _instance->lv2_descriptor->extension_data(uri); }

      SLV2Plugin slv2_plugin()         { return _plugin; }
      SLV2UI     slv2_ui()             { return _ui; }
      SLV2Port   slv2_port(uint32_t i) { return slv2_plugin_get_port_by_index(_plugin, i); }

      const char* port_symbol(uint32_t port);
      
      const LV2_Feature* const* features() { return _features; }
      
      std::set<uint32_t> automatable() const;

      void activate () { 
            if (!_was_activated) {
                  slv2_instance_activate(_instance);
                  _was_activated = true;
            }
      }

      void deactivate () {
            if (_was_activated) {
                  slv2_instance_deactivate(_instance);
                  _was_activated = false;
            }
      }

      void cleanup () {
            activate();
            deactivate();
            slv2_instance_free(_instance);
            _instance = NULL;
      }

      void set_block_size (nframes_t nframes) {}
      
      int         connect_and_run (std::vector<Sample*>& bufs, uint32_t maxbuf, int32_t& in, int32_t& out, nframes_t nframes, nframes_t offset);
      std::string describe_parameter (uint32_t);
      std::string state_node_name() const { return "lv2"; }
      void        print_parameter (uint32_t, char*, uint32_t len) const;

      bool parameter_is_audio(uint32_t) const;
      bool parameter_is_control(uint32_t) const;
      bool parameter_is_input(uint32_t) const;
      bool parameter_is_output(uint32_t) const;
      bool parameter_is_toggled(uint32_t) const;

      XMLNode& get_state();
      int      set_state(const XMLNode& node);
      bool     save_preset(std::string name);

      bool has_editor() const;

  private:
      void*                    _module;
      LV2World&                _world;
      LV2_Feature**            _features;
      SLV2Plugin               _plugin;
      SLV2UI                   _ui;
      SLV2Value                _name;
      SLV2Value                _author;
      SLV2Instance             _instance;
      nframes_t                _sample_rate;
      float*                   _control_data;
      float*                   _shadow_data;
      float*                   _defaults;
      float*                   _latency_control_port;
      bool                     _was_activated;
      vector<bool>             _port_is_input;

      typedef struct { const void* (*extension_data)(const char* uri); } LV2_DataAccess;
      LV2_DataAccess _data_access_extension_data;
      LV2_Feature _data_access_feature;
      LV2_Feature _instance_access_feature;

      void init (LV2World& world, SLV2Plugin plugin, nframes_t rate);
      void run (nframes_t nsamples);
      void latency_compute_run ();
};


/** The SLV2World, and various cached (as symbols, fast) URIs.
 *
 * This object represents everything ardour 'knows' about LV2
 * (ie understood extensions/features/etc)
 */
00148 struct LV2World {
      LV2World();
      ~LV2World();

      SLV2World world;
      SLV2Value input_class;
      SLV2Value output_class;
      SLV2Value audio_class;
      SLV2Value control_class;
      SLV2Value in_place_broken;
      SLV2Value integer;
      SLV2Value toggled;
      SLV2Value srate;
      SLV2Value gtk_gui;
};


class LV2PluginInfo : public PluginInfo {
public:     
      LV2PluginInfo (void* slv2_world, void* slv2_plugin);;
      ~LV2PluginInfo ();;
      static PluginInfoList discover (void* slv2_world);

      PluginPtr load (Session& session);

      void* _lv2_world;
      void* _slv2_plugin;
};

typedef boost::shared_ptr<LV2PluginInfo> LV2PluginInfoPtr;

} // namespace ARDOUR

#endif /* __ardour_lv2_plugin_h__ */

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