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plugin_manager.cc

/*
    Copyright (C) 2000-2004 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.

    $Id: plugin_manager.cc,v 1.18 2006/01/22 14:19:42 sampo Exp $
*/

#include <sys/types.h>
#include <cstdio>
#include <lrdf.h>
#include <dlfcn.h>

#ifdef VST_SUPPORT
#include <fst.h>
#include <pbd/basename.h>
#include <string.h>
#endif

#include <pbd/pathscanner.h>

#include <ardour/ladspa.h>
#include <ardour/session.h>
#include <ardour/plugin_manager.h>
#include <ardour/plugin.h>
#include <ardour/ladspa_plugin.h>
#include <ardour/vst_plugin.h>

#include <pbd/error.h>
#include <pbd/stl_delete.h>

#include "i18n.h"

using namespace ARDOUR;

PluginManager* PluginManager::_manager = 0;

PluginManager::PluginManager (AudioEngine& e)
      : _engine (e)
{
      char* s;
      string lrdf_path;

      if ((s = getenv ("LADSPA_RDF_PATH"))){
            lrdf_path = s;
      }

      if (lrdf_path.length() == 0) {
            lrdf_path = "/usr/local/share/ladspa/rdf:/usr/share/ladspa/rdf";
      }

      add_lrdf_data(lrdf_path);
      add_ladspa_presets();
#ifdef VST_SUPPORT
      if (Config->get_use_vst()) {
            add_vst_presets();
      }
#endif /* VST_SUPPORT */

      if ((s = getenv ("LADSPA_PATH"))) {
            ladspa_path = s;
      }

      if ((s = getenv ("VST_PATH"))) {
            vst_path = s;
      } else if ((s = getenv ("VST_PLUGINS"))) {
            vst_path = s;
      }

      refresh ();

      if (_manager == 0) {
            _manager = this;
      }
}

void
PluginManager::refresh ()
{
      ladspa_refresh ();
#ifdef VST_SUPPORT
      if (Config->get_use_vst()) {
            vst_refresh ();
      }
#endif
}

void
PluginManager::ladspa_refresh ()
{
      for (std::list<PluginInfo*>::iterator i = _ladspa_plugin_info.begin(); i != _ladspa_plugin_info.end(); ++i) {
            delete *i;
      }

      _ladspa_plugin_info.clear ();

      if (ladspa_path.length() == 0) {
            ladspa_path = "/usr/local/lib/ladspa:/usr/lib/ladspa";
      }

      ladspa_discover_from_path (ladspa_path);
}

int
PluginManager::add_ladspa_directory (string path)
{
      if (ladspa_discover_from_path (path) == 0) {
            ladspa_path += ':';
            ladspa_path += path;
            return 0;
      } 
      return -1;
}

static bool ladspa_filter (const string& str, void *arg)
{
      /* Not a dotfile, has a prefix before a period, suffix is "so" */
      
      return str[0] != '.' && (str.length() > 3 && str.find (".so") == (str.length() - 3));
}

int
PluginManager::ladspa_discover_from_path (string path)
{
      PathScanner scanner;
      vector<string *> *plugin_objects;
      vector<string *>::iterator x;
      int ret = 0;

      plugin_objects = scanner (ladspa_path, ladspa_filter, 0, true, true);

      if (plugin_objects) {
            for (x = plugin_objects->begin(); x != plugin_objects->end (); ++x) {
                  ladspa_discover (**x);
            }
      }

      vector_delete (plugin_objects);
      return ret;
}

static bool rdf_filter (const string &str, void *arg)
{
      return str[0] != '.' && 
               ((str.find(".rdf")  == (str.length() - 4)) ||
            (str.find(".rdfs") == (str.length() - 5)) ||
                (str.find(".n3")   == (str.length() - 3)));
}

void
PluginManager::add_ladspa_presets()
{
      add_presets ("ladspa");
}

void
PluginManager::add_vst_presets()
{
      add_presets ("vst");
}
void
PluginManager::add_presets(string domain)
{

      PathScanner scanner;
      vector<string *> *presets;
      vector<string *>::iterator x;

      char* envvar;
      if ((envvar = getenv ("HOME")) == 0) {
            return;
      }

      string path = compose("%1/.%2/rdf", envvar, domain);
      presets = scanner (path, rdf_filter, 0, true, true);

      if (presets) {
            for (x = presets->begin(); x != presets->end (); ++x) {
                  string file = "file:" + **x;
                  if (lrdf_read_file(file.c_str())) {
                        warning << compose(_("Could not parse rdf file: %1"), *x) << endmsg;
                  }
            }
      }

      vector_delete (presets);
}


void
PluginManager::add_lrdf_data (const string &path)
{
      PathScanner scanner;
      vector<string *>* rdf_files;
      vector<string *>::iterator x;
      string uri;

      rdf_files = scanner (path, rdf_filter, 0, true, true);

      if (rdf_files) {
            for (x = rdf_files->begin(); x != rdf_files->end (); ++x) {
                  uri = "file://" + **x;

                  if (lrdf_read_file(uri.c_str())) {
                        warning << "Could not parse rdf file: " << uri << endmsg;
                  }
            }
      }

      vector_delete (rdf_files);
}

int 
PluginManager::ladspa_discover (string path)
{
      PluginInfo *info;
      void *module;
      const LADSPA_Descriptor *descriptor;
      LADSPA_Descriptor_Function dfunc;
      const char *errstr;

      if ((module = dlopen (path.c_str(), RTLD_NOW)) == 0) {
            error << compose(_("LADSPA: cannot load module \"%1\" (%2)"), path, dlerror()) << endmsg;
            return -1;
      }

      dfunc = (LADSPA_Descriptor_Function) dlsym (module, "ladspa_descriptor");

      if ((errstr = dlerror()) != 0) {
            error << compose(_("LADSPA: module \"%1\" has no descriptor function."), path) << endmsg;
            error << errstr << endmsg;
            dlclose (module);
            return -1;
      }

      for (uint32_t i = 0; ; ++i) {
            if ((descriptor = dfunc (i)) == 0) {
                  break;
            }

            info = new PluginInfo;
            info->name = descriptor->Name;
            info->category = get_ladspa_category(descriptor->UniqueID);
            info->path = path;
            info->index = i;
            info->n_inputs = 0;
            info->n_outputs = 0;
            info->type = PluginInfo::LADSPA;
            info->unique_id = descriptor->UniqueID;
            
            for (uint32_t n=0; n < descriptor->PortCount; ++n) {
                  if ( LADSPA_IS_PORT_AUDIO (descriptor->PortDescriptors[n]) ) {
                        if ( LADSPA_IS_PORT_INPUT (descriptor->PortDescriptors[n]) ) {
                              info->n_inputs++;
                        }
                        else if ( LADSPA_IS_PORT_OUTPUT (descriptor->PortDescriptors[n]) ) {
                              info->n_outputs++;
                        }
                  }
            }

            _ladspa_plugin_info.push_back (info);
      }

// GDB WILL NOT LIKE YOU IF YOU DO THIS
//    dlclose (module);

      return 0;
}

Plugin *
PluginManager::load (Session& session, PluginInfo *info)
{
      void *module;
      Plugin *plugin = 0;

      try {
            if (info->type == PluginInfo::VST) {

#ifdef VST_SUPPORT                  
                  if (Config->get_use_vst()) {
                        FSTHandle* handle;
                        
                        if ((handle = fst_load (info->path.c_str())) == 0) {
                              error << compose(_("VST: cannot load module from \"%1\""), info->path) << endmsg;
                        } else {
                              plugin = new VSTPlugin (_engine, session, handle);
                        }
                  } else {
                        error << _("You asked ardour to not use any VST plugins") << endmsg;
                  }
#else
                  error << _("This version of ardour has no support for VST plugins") << endmsg;
                  return 0;
#endif                  
                        
            } else {

                  if ((module = dlopen (info->path.c_str(), RTLD_NOW)) == 0) {
                        error << compose(_("LADSPA: cannot load module from \"%1\""), info->path) << endmsg;
                        error << dlerror() << endmsg;
                  } else {
                        plugin = new LadspaPlugin (module, _engine, session, info->index, session.frame_rate());
                  }
            }

            plugin->set_info(*info);
      }

      catch (failed_constructor &err) {
            plugin = 0;
      }
      
      return plugin;
}

Plugin *
ARDOUR::find_plugin(Session& session, string name, long unique_id, PluginInfo::Type type)
{
      PluginManager *mgr = PluginManager::the_manager();
      list<PluginInfo *>::iterator i;
      list<PluginInfo *>* plugs = 0;

      switch (type) {
      case PluginInfo::LADSPA:
            plugs = &mgr->ladspa_plugin_info();
            break;
      case PluginInfo::VST:
            plugs = &mgr->vst_plugin_info();
            unique_id = 0; // VST plugins don't have a unique id.
            break;
      }

      for (i = plugs->begin(); i != plugs->end(); ++i) {
            if ((name == ""     || (*i)->name == name) &&
                  (unique_id == 0 || (*i)->unique_id ==unique_id) ){
                  return mgr->load (session, *i);
            }
      }
      
      return 0;
}

string
PluginManager::get_ladspa_category (uint32_t plugin_id)
{
      char buf[256];
      lrdf_statement pattern;

      snprintf(buf, sizeof(buf), "%s%" PRIu32, LADSPA_BASE, plugin_id);
      pattern.subject = buf;
      pattern.predicate = RDF_TYPE;
      pattern.object = 0;
      pattern.object_type = lrdf_uri;

      lrdf_statement* matches1 = lrdf_matches (&pattern);

      if (!matches1) {
            return _("Unknown");
      }

      pattern.subject = matches1->object;
      pattern.predicate = LADSPA_BASE "hasLabel";
      pattern.object = 0;
      pattern.object_type = lrdf_literal;

      lrdf_statement* matches2 = lrdf_matches (&pattern);
      lrdf_free_statements(matches1);

      if (!matches2) {
            return _("Unknown");
      }

      string label = matches2->object;
      lrdf_free_statements(matches2);

      return label;
}

#ifdef VST_SUPPORT

void
PluginManager::vst_refresh ()
{
      for (std::list<PluginInfo*>::iterator i = _vst_plugin_info.begin(); i != _vst_plugin_info.end(); ++i) {
            delete *i;
      }

      _vst_plugin_info.clear ();

      if (vst_path.length() == 0) {
            vst_path = "/usr/local/lib/vst:/usr/lib/vst";
      }

      vst_discover_from_path (vst_path);
}

int
PluginManager::add_vst_directory (string path)
{
      if (vst_discover_from_path (path) == 0) {
            vst_path += ':';
            vst_path += path;
            return 0;
      } 
      return -1;
}

static bool vst_filter (const string& str, void *arg)
{
      /* Not a dotfile, has a prefix before a period, suffix is "dll" */
      
      return str[0] != '.' && (str.length() > 4 && str.find (".dll") == (str.length() - 4));
}

int
PluginManager::vst_discover_from_path (string path)
{
      PathScanner scanner;
      vector<string *> *plugin_objects;
      vector<string *>::iterator x;
      int ret = 0;

      info << "detecting VST plugins along " << path << endmsg;

      plugin_objects = scanner (vst_path, vst_filter, 0, true, true);

      if (plugin_objects) {
            for (x = plugin_objects->begin(); x != plugin_objects->end (); ++x) {
                  vst_discover (**x);
            }
      }

      vector_delete (plugin_objects);
      return ret;
}

int
PluginManager::vst_discover (string path)
{
      FSTInfo* finfo;
      PluginInfo* info;

      if ((finfo = fst_get_info (const_cast<char *> (path.c_str()))) == 0) {
            return -1;
      }

      if (!finfo->canProcessReplacing) {
            warning << compose (_("VST plugin %1 does not support processReplacing, and so cannot be used in ardour at this time"),
                            finfo->name)
                  << endl;
      }
      
      info = new PluginInfo;

      /* what a goddam joke freeware VST is */

      if (!strcasecmp ("The Unnamed plugin", finfo->name)) {
            info->name = PBD::basename_nosuffix (path);
      } else {
            info->name = finfo->name;
      }

      info->category = "VST";
      info->path = path;
      info->index = 0;
      info->n_inputs = finfo->numInputs;
      info->n_outputs = finfo->numOutputs;
      info->type = PluginInfo::VST;
      
      _vst_plugin_info.push_back (info);
      fst_free_info (finfo);

      return 0;
}

#endif

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