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vst_plugin.cc

/*
    Copyright (C) 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: vst_plugin.cc,v 1.20 2006/02/11 14:46:05 sampo Exp $
*/

#include <algorithm>
#include <vector>
#include <string>
#include <ctype.h>

#include <cstdlib>
#include <cstdio> // so libraptor doesn't complain
#include <cmath>
#include <dirent.h>
#include <string.h> // for memmove
#include <sys/stat.h>
#include <cerrno>

#include <lrdf.h>
#include <fst.h>

#include <pbd/compose.h>
#include <pbd/error.h>
#include <pbd/pathscanner.h>
#include <pbd/xml++.h>

#include <vst/aeffectx.h>

#include <midi++/manager.h>

#include <ardour/ardour.h>
#include <ardour/session.h>
#include <ardour/audioengine.h>
#include <ardour/vst_plugin.h>

#include <pbd/stl_delete.h>

#include "i18n.h"
#include <locale.h>

using namespace ARDOUR;
using std::min;
using std::max;

VSTPlugin::VSTPlugin (AudioEngine& e, Session& session, FSTHandle* h)
      : Plugin (e, session)
{
      handle = h;

      if ((_fst = fst_instantiate (handle, Session::vst_callback, this)) == 0) {
            throw failed_constructor();
      }

      _plugin = _fst->plugin;
      _plugin->user = this;

      /* set rate and blocksize */

      _plugin->dispatcher (_plugin, effSetSampleRate, 0, 0, NULL, 
                       (float) session.frame_rate());
      _plugin->dispatcher (_plugin, effSetBlockSize, 0, 
                       session.get_block_size(), NULL, 0.0f);
      
      /* set program to zero */

      _plugin->dispatcher (_plugin, effSetProgram, 0, 0, NULL, 0.0f);
      
      Plugin::setup_midi_controls ();
}

VSTPlugin::VSTPlugin (const VSTPlugin &other)
      : Plugin (other)
{
      handle = other.handle;

      if ((_fst = fst_instantiate (handle, Session::vst_callback, this)) == 0) {
            throw failed_constructor();
      }
      _plugin = _fst->plugin;

      Plugin::setup_midi_controls ();
}

VSTPlugin::~VSTPlugin ()
{
      deactivate ();
      GoingAway (this); /* EMIT SIGNAL */
      fst_close (_fst);
}

void
VSTPlugin::set_block_size (jack_nframes_t nframes)
{
      deactivate ();
      _plugin->dispatcher (_plugin, effSetBlockSize, 0, nframes, NULL, 0.0f);
      activate ();
}

void
VSTPlugin::store_state (PluginState& state)
{
}

void
VSTPlugin::restore_state (PluginState& state)
{
}

float
VSTPlugin::default_value (uint32_t port)
{
      return 0;
}     

void
VSTPlugin::set_parameter (uint32_t which, float val)
{
      _plugin->setParameter (_plugin, which, val);
      ParameterChanged (which, val); /* EMIT SIGNAL */

      if (session().get_midi_feedback()) {
            
            if (which < parameter_count() && midi_controls[which]) {
                  midi_controls[which]->send_feedback (val);
            }
      }
}

float
VSTPlugin::get_parameter (uint32_t which) const
{
      return _plugin->getParameter (_plugin, which);
      
}

uint32_t
VSTPlugin::nth_parameter (uint32_t n, bool& ok) const
{
      ok = true;
      return n;
}

XMLNode&
VSTPlugin::get_state()
{
      XMLNode *root = new XMLNode (state_node_name());
      LocaleGuard lg (X_("POSIX"));
      
      if (_plugin->flags & effFlagsProgramChunks) {

            /* fetch the current chunk */
            
            void* data;
            long  data_size;
            
            if ((data_size = _plugin->dispatcher (_plugin, effGetChunk, 0, 0, &data, false)) == 0) {
                  return *root;
            }

            /* save it to a file */

            string path;
            struct stat sbuf;

            path = getenv ("HOME");
            path += "/.ardour/vst";

            if (stat (path.c_str(), &sbuf)) {
                  if (errno == ENOENT) {
                        if (mkdir (path.c_str(), 0600)) {
                              error << compose (_("cannot create VST chunk directory: %1"),
                                            strerror (errno))
                                    << endmsg;
                              return *root;
                        }

                  } else {

                        error << compose (_("cannot check VST chunk directory: %1"),
                                      strerror (errno))
                              << endmsg;
                        return *root;
                  }

            } else if (!S_ISDIR (sbuf.st_mode)) {
                  error << compose (_("%1 exists but is not a directory"), path)
                        << endmsg;
                  return *root;
            }
            
            path += "something";
            
            /* store information */

            XMLNode* chunk_node = new XMLNode (X_("chunk"));
            chunk_node->add_property ("path", path);
            
            root->add_child_nocopy (*chunk_node);
            
      } else {

            XMLNode* parameters = new XMLNode ("parameters");

            for (long n = 0; n < _plugin->numParams; ++n) {
                  char index[64];
                  char val[32];
                  snprintf (index, sizeof (index), "param_%ld", n);
                  snprintf (val, sizeof (val), "%f", _plugin->getParameter (_plugin, n));
                  parameters->add_property (index, val);
            }

            root->add_child_nocopy (*parameters);
      }

      return *root;
}

int
VSTPlugin::set_state(const XMLNode& node)
{
      LocaleGuard lg (X_("POSIX"));

      if (node.name() != state_node_name()) {
            error << _("Bad node sent to VSTPlugin::set_state") << endmsg;
            return 0;
      }

      XMLNode* child;

      if ((child = find_named_node (node, X_("chunks"))) != 0) {

            return 0;

      } else if ((child = find_named_node (node, X_("parameters"))) != 0) {
            
            XMLPropertyList::const_iterator i;

            for (i = child->properties().begin(); i != child->properties().end(); ++i) {
                  long param;
                  float val;
                  sscanf ((*i)->name().c_str(), "param_%ld", &param);
                  sscanf ((*i)->value().c_str(), "%f", &val);

                  _plugin->setParameter (_plugin, param, val);
            }

            return 0;
      }

      return -1;
}

int
VSTPlugin::get_parameter_descriptor (uint32_t which, ParameterDescriptor& desc) const
{
      VstParameterProperties prop;

      desc.min_unbound = false;
      desc.max_unbound = false;

      if (_plugin->dispatcher (_plugin, effGetParameterProperties, which, 0, &prop, 0)) {

            /* i have yet to find or hear of a VST plugin that uses this */

            if (prop.flags & kVstParameterUsesIntegerMinMax) {
                  desc.lower = prop.minInteger;
                  desc.upper = prop.maxInteger;
            } else {
                  desc.lower = 0;
                  desc.upper = 1.0;
            }
            
            if (prop.flags & kVstParameterUsesIntStep) {
                  
                  desc.step = prop.stepInteger;
                  desc.smallstep = prop.stepInteger;
                  desc.largestep = prop.stepInteger;
                  
            } else if (prop.flags & kVstParameterUsesFloatStep) {
                  
                  desc.step = prop.stepFloat;
                  desc.smallstep = prop.smallStepFloat;
                  desc.largestep = prop.largeStepFloat;
                  
            } else {
                  
                  float range = desc.upper - desc.lower;
                  
                  desc.step = range / 100.0f;
                  desc.smallstep = desc.step / 2.0f;
                  desc.largestep = desc.step * 10.0f;
            }
            
            desc.toggled = prop.flags & kVstParameterIsSwitch;
            desc.logarithmic = false;
            desc.sr_dependent = false;
            desc.label = prop.label;

      } else {

            /* old style */

            char label[64];
            label[0] = '\0';

            _plugin->dispatcher (_plugin, effGetParamName, which, 0, label, 0);

            desc.label = label;
            desc.integer_step = false;
            desc.lower = 0.0f;
            desc.upper = 1.0f;
            desc.step = 0.01f;
            desc.smallstep = 0.005f;
            desc.largestep = 0.1f;
            desc.toggled = false;
            desc.logarithmic = false;
            desc.sr_dependent = false;
      }

      return 0;
}

bool
VSTPlugin::load_preset (string name)
{
      if (_plugin->flags & effFlagsProgramChunks) {
            error << _("no support for presets using chunks at this time")
                  << endmsg;
            return false;
      }
      return Plugin::load_preset (name);
}

bool
VSTPlugin::save_preset (string name)
{
      if (_plugin->flags & effFlagsProgramChunks) {
            error << _("no support for presets using chunks at this time")
                  << endmsg;
            return false;
      }
      return Plugin::save_preset (name, "vst");
}

string
VSTPlugin::describe_parameter (uint32_t param)
{
      char name[64];
      _plugin->dispatcher (_plugin, effGetParamName, param, 0, name, 0);
      return name;
}

jack_nframes_t
VSTPlugin::latency () const
{
      return _plugin->initialDelay;
}

set<uint32_t>
VSTPlugin::automatable () const
{
      set<uint32_t> ret;

      for (uint32_t i = 0; i < parameter_count(); ++i){
            ret.insert (ret.end(), i);
      }

      return ret;
}

int
VSTPlugin::connect_and_run (vector<Sample*>& bufs, uint32_t maxbuf, int32_t& in_index, int32_t& out_index, jack_nframes_t nframes, jack_nframes_t offset)
{
      float *ins[_plugin->numInputs];
      float *outs[_plugin->numOutputs];
      int32_t i;

      for (i = 0; i < (int32_t) _plugin->numInputs; ++i) {
            ins[i] = bufs[min((uint32_t) in_index,maxbuf - 1)] + offset;
            in_index++;
      }

      for (i = 0; i < (int32_t) _plugin->numOutputs; ++i) {
            outs[i] = bufs[min((uint32_t) out_index,maxbuf - 1)] + offset;

            /* unbelievably, several VST plugins still rely on Cubase
               behaviour and do not silence the buffer in processReplacing 
               when they have no output.
            */
            
            // memset (outs[i], 0, sizeof (Sample) * nframes);
            out_index++;
      }


      /* we already know it can support processReplacing */

      _plugin->processReplacing (_plugin, ins, outs, nframes);
      
      return 0;
}

void
VSTPlugin::deactivate ()
{
      _plugin->dispatcher (_plugin, effMainsChanged, 0, 0, NULL, 0.0f);
}

void
VSTPlugin::activate ()
{
      _plugin->dispatcher (_plugin, effMainsChanged, 0, 1, NULL, 0.0f);
}

uint32_t 
VSTPlugin::unique_id() const
{
      return _plugin->uniqueID;
}


const char *
VSTPlugin::name () const
{
      return handle->name;
}

const char *
VSTPlugin::maker () const
{
      return "imadeit";
}

const char *
VSTPlugin::label () const
{
      return handle->name;
}

uint32_t
VSTPlugin::parameter_count() const
{
      return _plugin->numParams;
}

bool
VSTPlugin::has_editor () const
{
      return _plugin->flags & effFlagsHasEditor;
}

void
VSTPlugin::print_parameter (uint32_t param, char *buf, uint32_t len) const
{
      char lab[9];
      char *first_nonws;

      _plugin->dispatcher (_plugin, effGetParamLabel, param, 0, lab, 0);
      _plugin->dispatcher (_plugin, effGetParamDisplay, param, 0, buf, 0);

      if (buf[0] == '\0') {
            return;
      }

      first_nonws = buf;
      while (*first_nonws && isspace (*first_nonws)) {
            first_nonws++;
      }
      if (*first_nonws == '\0') {
            return;
      }

      memmove (buf, first_nonws, strlen (buf) - (first_nonws - buf) + 1);
}

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