src/calf/modules_small.h

   1 /* Calf DSP Library
   2  * "Small" audio modules for modular synthesis
   3  *
   4  * Copyright (C) 2001-2007 Krzysztof Foltman
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21 #ifndef __CALF_MODULES_SMALL_H
  22 #define __CALF_MODULES_SMALL_H
  23
  24 #if USE_LV2
  25
  26 #include <lv2.h>
  27 #include "plugininfo.h"
  28 #include "lv2_polymorphic_port.h"
  29 #include "lv2helpers.h"
  30
  31 namespace calf_plugins {
  32
  33 /// Empty implementations for plugin functions. Note, that some functions aren't virtual, because they're called via the particular
  34 /// subclass via template wrappers (ladspa_small_wrapper<> etc), not via base class pointer/reference. On the other hand,
  35 /// other functions are virtual when overhead is acceptable (instantiation time functions etc.)
  36 class null_small_audio_module: public uri_map_access
  37 {
  38 public:
  39     uint32_t srate;
  40     double odsr;
  41     uint32_t poly_type_control, poly_type_audio;
  42     /// for polymorphic ports: "is audio" flags for first 32 ports (should be sufficient for most plugins)
  43     uint32_t poly_port_types;
  44
  45     null_small_audio_module()
  46     : srate((uint32_t)-1)
  47     , odsr(0.)
  48     , poly_type_control(0)
  49     , poly_type_audio(0)
  50     , poly_port_types(0)
  51     {
  52     }
  53
  54     /// Called when host changes type of the polymorphic port
  55     inline void set_port_type(uint32_t port, uint32_t type, void *type_data) {
  56         if (port >= 32)
  57             return;
  58         uint32_t port_mask = 1 << port;
  59         if (type == poly_type_control)
  60             poly_port_types &= ~port_mask;
  61         else if (type == poly_type_audio)
  62             poly_port_types |= port_mask;
  63         on_port_types_changed();
  64     }
  65
  66     /// Returns 1 for audio ports and 0 for control ports
  67     inline unsigned int port_is_audio(unsigned int port) {
  68         return (poly_port_types >> port) & 1;
  69     }
  70
  71     /// Returns (unsigned)-1 for audio ports and 0 for control ports
  72     inline unsigned int port_audio_mask(unsigned int port) {
  73         return 0 - ((poly_port_types >> port) & 1);
  74     }
  75
  76     /// Returns (unsigned)-1 for audio ports and 0 for control ports
  77     static inline unsigned int port_audio_mask(unsigned int port, uint32_t poly_port_types) {
  78         return 0 - ((poly_port_types >> port) & 1);
  79     }
  80
  81     virtual void on_port_types_changed() {}
  82     inline void set_bundle_path(const char *path) {}
  83     /// Called to map all the necessary URIs
  84     virtual void map_uris()
  85     {
  86         poly_type_control = map_uri(LV2_POLYMORPHIC_PORT_URI, "http://lv2plug.in/ns/lv2core#ControlPort");
  87         poly_type_audio = map_uri(LV2_POLYMORPHIC_PORT_URI, "http://lv2plug.in/ns/lv2core#AudioPort");
  88     }
  89     /// Called on instantiation with the list of LV2 features called
  90     virtual void use_features(const LV2_Feature *const *features) {
  91         while(*features)
  92         {
  93             use_feature((*features)->URI, (*features)->data);
  94             features++;
  95         }
  96     }
  97     /// LADSPA-esque activate function, except it is called after ports are connected, not before
  98     inline void activate() {}
  99     /// LADSPA-esque deactivate function
 100     inline void deactivate() {}
 101     /// Set sample rate for the plugin
 102     inline void set_sample_rate(uint32_t sr) { srate = sr; odsr = 1.0 / sr; }
 103     static inline const void *ext_data(const char *URI) { return NULL; }
 104 };
 105
 106 /// Templatized version useful when the number of inputs and outputs is small
 107 template<unsigned int Inputs, unsigned int Outputs>
 108 class small_audio_module_base: public null_small_audio_module
 109 {
 110 public:
 111     enum { in_count = Inputs, out_count = Outputs };
 112     /// Input pointers
 113     float *ins[in_count];
 114     /// Output pointers
 115     float *outs[out_count];
 116 };
 117
 118 template<class Module>
 119 struct lv2_small_wrapper
 120 {
 121     typedef Module instance;
 122     static LV2_Descriptor descriptor;
 123     std::string uri;
 124     static uint32_t poly_port_types;
 125
 126     lv2_small_wrapper(const char *id)
 127     {
 128         uri = "http://calf.sourceforge.net/small_plugins/" + std::string(id);
 129         descriptor.URI = uri.c_str();
 130         descriptor.instantiate = cb_instantiate;
 131         descriptor.connect_port = cb_connect;
 132         descriptor.activate = cb_activate;
 133         descriptor.run = cb_run;
 134         descriptor.deactivate = cb_deactivate;
 135         descriptor.cleanup = cb_cleanup;
 136         descriptor.extension_data = cb_ext_data;
 137
 138         plugin_port_type_grabber ptg(poly_port_types);
 139         Module::plugin_info(&ptg);
 140     }
 141
 142     static void cb_connect(LV2_Handle Instance, uint32_t port, void *DataLocation) {
 143         unsigned long ins = Module::in_count;
 144         unsigned long outs = Module::out_count;
 145         instance *const mod = (instance *)Instance;
 146         if (port < ins)
 147             mod->ins[port] = (float *)DataLocation;
 148         else if (port < ins + outs)
 149             mod->outs[port - ins] = (float *)DataLocation;
 150     }
 151
 152     static void cb_activate(LV2_Handle Instance) {
 153         // Note the changed semantics (now more LV2-like)
 154         instance *const mod = (instance *)Instance;
 155         mod->activate();
 156     }
 157
 158     static void cb_deactivate(LV2_Handle Instance) {
 159         instance *const mod = (instance *)Instance;
 160         mod->deactivate();
 161     }
 162
 163     static uint32_t cb_set_type(LV2_Handle Instance, uint32_t port, uint32_t type, void *type_data)
 164     {
 165         instance *const mod = (instance *)Instance;
 166         mod->set_port_type(port, type, type_data);
 167         return 0;
 168     }
 169
 170     static LV2_Handle cb_instantiate(const LV2_Descriptor * Descriptor, double sample_rate, const char *bundle_path, const LV2_Feature *const *features)
 171     {
 172         instance *mod = new instance();
 173         mod->poly_port_types = poly_port_types;
 174         // XXXKF some people use fractional sample rates; we respect them ;-)
 175         mod->set_bundle_path(bundle_path);
 176         mod->use_features(features);
 177         mod->set_sample_rate((uint32_t)sample_rate);
 178         return mod;
 179     }
 180
 181     static void cb_run(LV2_Handle Instance, uint32_t SampleCount) {
 182         instance *const mod = (instance *)Instance;
 183         mod->process(SampleCount);
 184     }
 185
 186     static void cb_cleanup(LV2_Handle Instance) {
 187         instance *const mod = (instance *)Instance;
 188         delete mod;
 189     }
 190
 191     static const void *cb_ext_data(const char *URI) {
 192         return Module::ext_data(URI);
 193     }
 194 };
 195
 196 extern const LV2_Descriptor *lv2_small_descriptor(uint32_t index);
 197
 198 };
 199
 200 #endif
 201
 202 #endif