libs/ardour/ardour/lv2_plugin.h

   1 /*
   2     Copyright (C) 2008 Paul Davis
   3     Author: Dave Robillard
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #ifndef __ardour_lv2_plugin_h__
  22 #define __ardour_lv2_plugin_h__
  23
  24 #include <set>
  25 #include <vector>
  26 #include <string>
  27 #include <dlfcn.h>
  28
  29 #include <sigc++/signal.h>
  30
  31 #include <pbd/stateful.h>
  32
  33 #include <jack/types.h>
  34 #include <slv2/slv2.h>
  35 #include <ardour/plugin.h>
  36
  37 namespace ARDOUR {
  38 class AudioEngine;
  39 class Session;
  40 struct LV2World;
  41
  42 class LV2Plugin : public ARDOUR::Plugin
  43 {
  44   public:
  45         LV2Plugin (ARDOUR::AudioEngine&, ARDOUR::Session&, ARDOUR::LV2World&, SLV2Plugin plugin, nframes_t sample_rate);
  46         LV2Plugin (const LV2Plugin &);
  47         ~LV2Plugin ();
  48
  49         /* Plugin interface */
  50
  51         std::string unique_id() const;
  52         const char* label() const           { return slv2_value_as_string(_name); }
  53         const char* name() const            { return slv2_value_as_string(_name); }
  54         const char* maker() const           { return _author ? slv2_value_as_string(_author) : "Unknown"; }
  55         uint32_t    parameter_count() const { return slv2_plugin_get_num_ports(_plugin); }
  56         float       default_value (uint32_t port);
  57         nframes_t   latency() const;
  58         void        set_parameter (uint32_t port, float val);
  59         float       get_parameter (uint32_t port) const;
  60         int         get_parameter_descriptor (uint32_t which, ParameterDescriptor&) const;
  61         uint32_t    nth_parameter (uint32_t port, bool& ok) const;
  62
  63         const void* extension_data(const char* uri) { return _instance->lv2_descriptor->extension_data(uri); }
  64
  65         SLV2Plugin slv2_plugin()         { return _plugin; }
  66         SLV2UI     slv2_ui()             { return _ui; }
  67         bool       is_external_ui() const;
  68         SLV2Port   slv2_port(uint32_t i) { return slv2_plugin_get_port_by_index(_plugin, i); }
  69
  70         const char* port_symbol(uint32_t port);
  71
  72         const LV2_Feature* const* features() { return _features; }
  73
  74         std::set<uint32_t> automatable() const;
  75
  76         void activate () {
  77                 if (!_was_activated) {
  78                         slv2_instance_activate(_instance);
  79                         _was_activated = true;
  80                 }
  81         }
  82
  83         void deactivate () {
  84                 if (_was_activated) {
  85                         slv2_instance_deactivate(_instance);
  86                         _was_activated = false;
  87                 }
  88         }
  89
  90         void cleanup () {
  91                 activate();
  92                 deactivate();
  93                 slv2_instance_free(_instance);
  94                 _instance = NULL;
  95         }
  96
  97         int set_block_size (nframes_t nframes) { return 0; }
  98
  99         int         connect_and_run (std::vector<Sample*>& bufs, uint32_t maxbuf, int32_t& in, int32_t& out, nframes_t nframes, nframes_t offset);
 100         std::string describe_parameter (uint32_t);
 101         std::string state_node_name() const { return "lv2"; }
 102         void        print_parameter (uint32_t, char*, uint32_t len) const;
 103
 104         bool parameter_is_audio(uint32_t) const;
 105         bool parameter_is_control(uint32_t) const;
 106         bool parameter_is_input(uint32_t) const;
 107         bool parameter_is_output(uint32_t) const;
 108         bool parameter_is_toggled(uint32_t) const;
 109
 110         XMLNode& get_state();
 111         int      set_state(const XMLNode& node);
 112         bool     save_preset(std::string name);
 113
 114         bool has_editor() const;
 115
 116   private:
 117         void*                    _module;
 118         LV2World&                _world;
 119         LV2_Feature**            _features;
 120         SLV2Plugin               _plugin;
 121         SLV2UI                   _ui;
 122         SLV2Value                _name;
 123         SLV2Value                _author;
 124         SLV2Instance             _instance;
 125         nframes_t                _sample_rate;
 126         float*                   _control_data;
 127         float*                   _shadow_data;
 128         float*                   _defaults;
 129         float*                   _latency_control_port;
 130         bool                     _was_activated;
 131         vector<bool>             _port_is_input;
 132
 133         typedef struct { const void* (*extension_data)(const char* uri); } LV2_DataAccess;
 134         LV2_DataAccess _data_access_extension_data;
 135         LV2_Feature _data_access_feature;
 136         LV2_Feature _instance_access_feature;
 137
 138         void init (LV2World& world, SLV2Plugin plugin, nframes_t rate);
 139         void run (nframes_t nsamples);
 140         void latency_compute_run ();
 141 };
 142
 143
 144 /** The SLV2World, and various cached (as symbols, fast) URIs.
 145  *
 146  * This object represents everything ardour 'knows' about LV2
 147  * (ie understood extensions/features/etc)
 148  */
 149 struct LV2World {
 150         LV2World();
 151         ~LV2World();
 152
 153         SLV2World world;
 154         SLV2Value input_class;
 155         SLV2Value output_class;
 156         SLV2Value audio_class;
 157         SLV2Value control_class;
 158         SLV2Value in_place_broken;
 159         SLV2Value integer;
 160         SLV2Value toggled;
 161         SLV2Value srate;
 162         SLV2Value gtk_gui;
 163         SLV2Value external_gui;
 164         SLV2Value logarithmic;
 165 };
 166
 167
 168 class LV2PluginInfo : public PluginInfo {
 169 public:
 170         LV2PluginInfo (void* slv2_world, void* slv2_plugin);;
 171         ~LV2PluginInfo ();;
 172         static PluginInfoList discover (void* slv2_world);
 173
 174         PluginPtr load (Session& session);
 175
 176         void* _lv2_world;
 177         void* _slv2_plugin;
 178 };
 179
 180 typedef boost::shared_ptr<LV2PluginInfo> LV2PluginInfoPtr;
 181
 182 } // namespace ARDOUR
 183
 184 #endif /* __ardour_lv2_plugin_h__ */